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US20180313006A1 - Lightweight, Printable Flame Resistant Fabrics Suitable for Protective Clothing Worn in Hot and/or Humid Environments - Google Patents

Lightweight, Printable Flame Resistant Fabrics Suitable for Protective Clothing Worn in Hot and/or Humid Environments Download PDF

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Publication number
US20180313006A1
US20180313006A1 US15/768,142 US201615768142A US2018313006A1 US 20180313006 A1 US20180313006 A1 US 20180313006A1 US 201615768142 A US201615768142 A US 201615768142A US 2018313006 A1 US2018313006 A1 US 2018313006A1
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US
United States
Prior art keywords
fabric
flame resistant
fibers
yarns
resistant fabric
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Abandoned
Application number
US15/768,142
Inventor
Michael T. Stanhope
Timothy James Thorne
Charles S. Dunn
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Southern Mills Inc
Original Assignee
Southern Mills Inc
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Filing date
Publication date
Application filed by Southern Mills Inc filed Critical Southern Mills Inc
Priority to US15/768,142 priority Critical patent/US20180313006A1/en
Assigned to SOUTHERN MILLS, INC. reassignment SOUTHERN MILLS, INC. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: DUNN, CHARLES S., STANHOPE, MICHAEL T., THORNE, Timothy James
Publication of US20180313006A1 publication Critical patent/US20180313006A1/en
Abandoned legal-status Critical Current

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Classifications

    • D03D15/12—
    • D—TEXTILES; PAPER
    • D02—YARNS; MECHANICAL FINISHING OF YARNS OR ROPES; WARPING OR BEAMING
    • D02G—CRIMPING OR CURLING FIBRES, FILAMENTS, THREADS, OR YARNS; YARNS OR THREADS
    • D02G3/00—Yarns or threads, e.g. fancy yarns; Processes or apparatus for the production thereof, not otherwise provided for
    • D02G3/44—Yarns or threads characterised by the purpose for which they are designed
    • D02G3/443—Heat-resistant, fireproof or flame-retardant yarns or threads
    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
    • D03D1/00—Woven fabrics designed to make specified articles
    • D03D1/0035—Protective fabrics
    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
    • D03D15/00—Woven fabrics characterised by the material, structure or properties of the fibres, filaments, yarns, threads or other warp or weft elements used
    • D03D15/20—Woven fabrics characterised by the material, structure or properties of the fibres, filaments, yarns, threads or other warp or weft elements used characterised by the material of the fibres or filaments constituting the yarns or threads
    • D03D15/208—Woven fabrics characterised by the material, structure or properties of the fibres, filaments, yarns, threads or other warp or weft elements used characterised by the material of the fibres or filaments constituting the yarns or threads cellulose-based
    • D03D15/225—Woven fabrics characterised by the material, structure or properties of the fibres, filaments, yarns, threads or other warp or weft elements used characterised by the material of the fibres or filaments constituting the yarns or threads cellulose-based artificial, e.g. viscose
    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
    • D03D15/00—Woven fabrics characterised by the material, structure or properties of the fibres, filaments, yarns, threads or other warp or weft elements used
    • D03D15/20—Woven fabrics characterised by the material, structure or properties of the fibres, filaments, yarns, threads or other warp or weft elements used characterised by the material of the fibres or filaments constituting the yarns or threads
    • D03D15/283—Woven fabrics characterised by the material, structure or properties of the fibres, filaments, yarns, threads or other warp or weft elements used characterised by the material of the fibres or filaments constituting the yarns or threads synthetic polymer-based, e.g. polyamide or polyester fibres
    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
    • D03D15/00—Woven fabrics characterised by the material, structure or properties of the fibres, filaments, yarns, threads or other warp or weft elements used
    • D03D15/40—Woven fabrics characterised by the material, structure or properties of the fibres, filaments, yarns, threads or other warp or weft elements used characterised by the structure of the yarns or threads
    • D03D15/47—Woven fabrics characterised by the material, structure or properties of the fibres, filaments, yarns, threads or other warp or weft elements used characterised by the structure of the yarns or threads multicomponent, e.g. blended yarns or threads
    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
    • D03D15/00—Woven fabrics characterised by the material, structure or properties of the fibres, filaments, yarns, threads or other warp or weft elements used
    • D03D15/50—Woven fabrics characterised by the material, structure or properties of the fibres, filaments, yarns, threads or other warp or weft elements used characterised by the properties of the yarns or threads
    • D03D15/513—Woven fabrics characterised by the material, structure or properties of the fibres, filaments, yarns, threads or other warp or weft elements used characterised by the properties of the yarns or threads heat-resistant or fireproof
    • D—TEXTILES; PAPER
    • D10—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10B—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10B2201/00—Cellulose-based fibres, e.g. vegetable fibres
    • D10B2201/20—Cellulose-derived artificial fibres
    • D10B2201/22—Cellulose-derived artificial fibres made from cellulose solutions
    • D—TEXTILES; PAPER
    • D10—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10B—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10B2201/00—Cellulose-based fibres, e.g. vegetable fibres
    • D10B2201/20—Cellulose-derived artificial fibres
    • D10B2201/22—Cellulose-derived artificial fibres made from cellulose solutions
    • D10B2201/24—Viscose
    • D—TEXTILES; PAPER
    • D10—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10B—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10B2321/00—Fibres made from polymers obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • D10B2321/10—Fibres made from polymers obtained by reactions only involving carbon-to-carbon unsaturated bonds polymers of unsaturated nitriles, e.g. polyacrylonitrile, polyvinylidene cyanide
    • D10B2321/101—Fibres made from polymers obtained by reactions only involving carbon-to-carbon unsaturated bonds polymers of unsaturated nitriles, e.g. polyacrylonitrile, polyvinylidene cyanide modacrylic
    • D—TEXTILES; PAPER
    • D10—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10B—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10B2331/00—Fibres made from polymers obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds, e.g. polycondensation products
    • D10B2331/02—Fibres made from polymers obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds, e.g. polycondensation products polyamides
    • D—TEXTILES; PAPER
    • D10—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10B—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10B2331/00—Fibres made from polymers obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds, e.g. polycondensation products
    • D10B2331/02—Fibres made from polymers obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds, e.g. polycondensation products polyamides
    • D10B2331/021—Fibres made from polymers obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds, e.g. polycondensation products polyamides aromatic polyamides, e.g. aramides
    • D—TEXTILES; PAPER
    • D10—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10B—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10B2401/00—Physical properties
    • D10B2401/14—Dyeability
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T442/00—Fabric [woven, knitted, or nonwoven textile or cloth, etc.]
    • Y10T442/30—Woven fabric [i.e., woven strand or strip material]
    • Y10T442/3976—Including strand which is stated to have specific attributes [e.g., heat or fire resistance, chemical or solvent resistance, high absorption for aqueous composition, water solubility, heat shrinkability, etc.]
    • Y10T442/3984—Strand is other than glass and is heat or fire resistant

Definitions

  • Embodiments of the present invention relate to flame resistant fabrics for inclusion into protective garments for military and electrical applications.
  • Protective garments are designed to protect the wearer from hazardous environmental conditions the wearer might encounter. Such garments include those designed to be worn by military personnel, as well as firefighters and other rescue personnel and industrial and electrical workers.
  • GL-PD-07-12, Rev. 8 Purchase Description: Cloth, Flame Resistant, Nov. 26, 2014, incorporated herein by reference
  • MIL-PRF-EFRCE Purchase Description: Uniform, Enhanced Flame Resistant Combat Ensemble ( EFRCE ) Blouse and Trouser, September 2015, incorporated herein by reference
  • EFRCE Enhanced Flame Resistant Combat Ensemble
  • GL-PD-07-12 and MIL-PRF-EFRCE both purchase descriptions include color requirements for military fabrics. More specifically, both address the color shades and camouflage patterns to which the fabrics must be colored, depending on the environment in which the uniforms are intended to be worn.
  • GL-PD-07-12 identifies the following three camouflage patterns:
  • IR requirements spectral or near infrared reflectance requirements
  • IR requirements spectral or near infrared reflectance requirements
  • ASTM F 1506 requires that the garments and/or individual layers or parts thereof pass a number of different performance tests.
  • Table 1 of ASTM F 1506 sets forth requirements for woven fabrics, including (among others) strength requirements (e.g., tensile strength, tear strength), colorfastness and laundry shrinkage requirements, and thermal protective requirements (e.g., minimal char length and afterflame requirements). As indicted in Table 1, such requirements may differ depending on the weight of the woven fabric tested.
  • Table 2 of F 1506 sets forth the same property requirements for knitted fabrics.
  • ASTM F 1506 requires all fabrics (woven or knitted) to have a char length of 6 inches or less and have a two second (or less) afterflame, when measured pursuant to the testing methodology set forth in ASTM D6413 (Standard Test Method for Flame Resistance of Textiles, 2015 edition, incorporated herein by reference).
  • a fabric specimen is suspended vertically over a flame for twelve seconds.
  • the fabric must self-extinguish within two seconds (i.e., it must have a 2 second or less afterflame). After the fabric self-extinguishes, a specified amount of weight is attached to the fabric and the fabric lifted so that the weight is suspended from the fabric.
  • the fabric will typically tear along the charred portion of the fabric.
  • the length of the tear (i.e., the char length) must be 6 inches or less when the test is performed in both the machine/warp and cross-machine/fill directions of the fabric.
  • a fabric sample is typically tested for compliance both before it has been washed (and thus when the fabric still contains residual—and often flammable—chemicals from finishing processes) and after a certain number of launderings (e.g., 25 launderings for ASTM F 1506).
  • Embodiments of the invention relate to flame resistant fabrics comprising a blend of modacrylic, aliphatic polyamide, and cellulosic fibers.
  • Some embodiments are printed and/or dyed with vat dyes so as to comply with the color requirements (including the color, colorfastness, and IR requirements) set forth in the relevant sections of GL-PD-07-12 and/or MIL-PRF-EFRCE.
  • Some embodiments further include reinforcing yarns that improve the strength of the fabrics.
  • Still other embodiments are flame resistant fabrics for use in electrical applications that comply with some or all of the requirements of ASTM F 1506.
  • Some embodiments of the invention include flame resistant fabrics suitable for use in military uniforms. Such embodiments of the fabrics preferably comply with the relevant color requirements (including the color, colorfastness, and IR requirements) set forth in sections 3.6 and 3.8 of GL-PD-07-12 and sections 3.3.2, 3.3.5, and 3.3.7 of MIL-PRF-EFRCE. Moreover, some embodiments of the fabrics are low weight and fast drying, rendering them particularly suitable for hot and hot/humid conditions in that such fabrics manage moisture effectively and dry quickly.
  • the fabrics may be woven or knitted from a combination of spun yarns containing a blend of different types of fibers.
  • the spun yarns in the fabric may all have the same fiber blend, or the fabric may be formed with spun yarns having different fiber blends.
  • At least some of the spun yarns are formed of a blend that includes modacrylic fibers.
  • suitable modacrylic fibers are PROTEXTM fibers available from Kaneka Corporation of Osaka, Japan, SEFTM available from Solutia, PyroTex® available from PyroTex Fibers GmbH, or blends thereof.
  • the modacrylic fibers may constitute 30-80%, inclusive; 35-70%, inclusive; and 40-60%, inclusive, of the fiber blend.
  • the blend may also include aliphatic polyamides to increase the fabric strength and abrasion resistance.
  • Nylon or flame resistant (“FR”) nylon, Nylon XF, and Nylon HT are examples of suitable aliphatic polyamides for use in the blend.
  • aliphatic polyamide fibers (such as nylon and/or FR nylon fibers) constitute 5-50%, inclusive; 10-45%, inclusive; 10-35%, inclusive; 15-30%, inclusive; and 20-30%, inclusive of the fiber blend.
  • the fiber blend may further include FR or non-FR cellulosic fibers, including, but not limited to, natural and synthetic cellulosic fibers (e.g., cotton, rayon, acetate, triacetate, and lyocell, as well as their flame resistant counterparts FR cotton, FR rayon, FR acetate, FR triacetate, and FR lyocell).
  • rayon fibers include ViscoseTM and ModalTM by Lenzing, available from Lenzing Fibers Corporation.
  • An example of an FR rayon material is Lenzing FRTM, also available from Lenzing Fibers Corporation, and VISILTM, available from Sateri.
  • lyocell fibers include TENCELTM, TENCEL G100TM and TENCEL A100TM, all available from Lenzing Fibers Corporation.
  • synthetic cellulosic fibers are included in the fiber blend.
  • FR or non-FR lyocell fibers are included in the blend.
  • non-FR cellulosic fibers (such as non-FR lyocell fibers) constitute 10-60%, inclusive; 10-55%, inclusive; 10-50%, inclusive; 10-45%, inclusive; 10-40%, inclusive; and 20-40%, inclusive, of the fiber blend.
  • FR cellulosic fibers (such as FR lyocell fibers) constitute 10-80%, inclusive; 15-75%, inclusive; 15-65%, inclusive; 15-50%, inclusive; 20-40%, inclusive; 10-40%, inclusive; and 15-35%, inclusive, of the fiber blend.
  • the fiber blend includes a blend of modacrylic, nylon, and cellulosic fibers (e.g., synthetic cellulosic fibers such as lyocell fibers).
  • the spun yarns are formed from a fiber blend having approximately 30-80% modacrylic fibers, approximately 10-60% cellulosic fibers (e.g., synthetic cellulosic), and approximately 5-50% nylon fibers.
  • the spun yarns are formed from a fiber blend having approximately 35-70% modacrylic fibers, approximately 10-50% cellulosic fibers (e.g., synthetic cellulosic), and approximately 10-40% nylon fibers.
  • the spun yarns are formed from a fiber blend having approximately 40-65% modacrylic fibers, approximately 10-40% cellulosic fibers (e.g., synthetic cellulosic), and approximately 15-40% nylon fibers.
  • the cellulosic fibers (such as lyocell) and nylon fibers used in these blends can be FR or non-FR.
  • the spun yarns of these embodiments are devoid of additional inherently flame resistant fibers, such as aramid fibers.
  • the same types of modacrylic fibers, cellulosic fibers, and nylon fibers need not be used in the blend. Rather, multiple types of each may be blended together.
  • the cellulosic fibers are provided in the blend to increase the comfort and moisture management of the fabric. In some embodiments, however, it may be desirable (but not required) to use lower levels of cellulosic fibers to help reduce fabric drying time. In some embodiments, the cellulosic fibers constitute less of the fiber blend than the nylon fibers.
  • the fiber blend is devoid of other FR fibers typically used in FR fabrics to impart FR properties to the fabrics, such as, but not limited to, aramid fibers such as meta- and para-aramid fibers.
  • FR and non-FR fibers include, but are not limited to, para-aramid fibers, meta-aramid fibers, polybenzoxazole (“PBO”) fibers, polybenzimidazole (“PBI”) fibers, poly ⁇ 2,6-diimidazo [4,5-40; 50-e]-pyridinylene-1,4(2,5-dihydroxy)phenylene ⁇ (“PIPD”) fibers, ultra-high molecular weight (UHMW) polyethylene fibers, UHMW polypropylene fibers, polyvinyl alcohol fibers, polyacrylonitrile (PAN) fibers, liquid crystal polymer fibers (e.g., aromatic polyesters such as VECTRAN), glass fibers, polynosic rayon fibers, carbon fibers, silk fibers, polyamide fibers, polyester fibers, aromatic
  • para-aramid fibers examples include KEVLARTM (available from DuPont), TECHNORATM (available from Teijin Twaron BV of Arnheim, Netherlands), and TWARONTM (also available from Teijin Twaron BV).
  • meta-aramid fibers examples include NOMEXTM (available from DuPont), CONEXTM (available from Teijin), and APYEILTM (available from Unitika).
  • An example of a polyester fiber is DACRON® (available from InvistaTM).
  • An example of a PIPD fiber includes M5 (available from Dupont).
  • An example of melamine fibers is BASOFILTM (available from Basofil Fibers).
  • PAN fibers is Panox® (available from the SGL Group).
  • UHMW polyethylene materials examples include Dyneema and Spectra.
  • An example of a liquid crystal polymer material is VECTRANTM (available from Kuraray).
  • anti-static fibers, anti-microbial fibers, and/or stretch fibers may also be added to the blend.
  • the spun yarns can be formed in conventional ways well known in the industry.
  • the spun yarns can comprise a single yarn or two or more individual yarns that are twisted, plied, or otherwise combined together.
  • the spun yarns can subsequently be used to form fabrics in a variety of ways, all well known in the industry.
  • the yarns can be knitted or woven.
  • the fabric is formed as a plain weave fabric or a twill weave (e.g. 2 ⁇ 1 twill) fabric that comprises a plurality of body yarns.
  • a rip-stop weave e.g. 2 ⁇ 1 twill
  • sateen weave etc.
  • the reinforcing yarns may be spun yarns (such as, but not limited to, those described above), continuous filament yarns, stretch broken yarns, and combinations thereof.
  • the reinforcing yarns may be of any size (i.e., of any cotton count or denier).
  • the reinforcing yarns may be formed from a variety of different materials, including, but not limited to, polyamides (e.g., nylon), high density polyethylene, rayon (FR or non-FR), polyester, aramids (meta-aramid and para-aramid), as well as the other inherently FR fibers and/or non-inherently FR fibers (FR or non-FR) identified above.
  • the reinforcing yarns are nylon continuous filament yarns.
  • the body of the fabric is formed of spun yarns (such as those described above) and the reinforcing yarns are provided in one or both of the machine/warp and cross-machine/fill directions of the fabric.
  • the reinforcing yarns are provided in both the machine/warp and cross-machine/fill directions of the fabric so as to create a grid-like pattern.
  • the occurrence of the reinforcing yarns may be the same or different in each fabric direction.
  • the reinforcing yarns may be provided in isolation or may be combined, coupled, or covered (i.e., plied, ply twist, wrapped, coresheath, coverspun, etc.) with one or more other yarns (or staple fibers).
  • the reinforcing yarns may be provided at any frequency within the fabric.
  • a reinforcing yarn may be provided every n th end or pick.
  • the frequency at which reinforcing yarns are used i.e., the value of “n” can be the same or different (1) within a direction of the fabric and/or (2) in different directions of the fabric.
  • the value of “n” can be anywhere between 1-60, inclusive; 1-50, inclusive; 1-40, inclusive; 1-30, inclusive; 1-20, inclusive; 1-10, inclusive; and 1-5, inclusive, such that at least (n-1) ends or picks of body yarns are positioned between the adjacent reinforcing yarns that are separated by body yarns.
  • reinforcing yarns may be provided directly adjacent each other (i.e., not separated from each other by body yarns) in one or both directions of the fabric.
  • at least some occurrences of reinforcing yarns in the fabric may include three reinforcing yarns in a row, four reinforcing yarns in a row, five reinforcing yarns in a row, etc.
  • the frequency of the occurrence of reinforcing yarns as well as the number of reinforcing yarns provided at each such occurrence may depend on the desired strength properties of the fabric as well as the size of the reinforcing yarns. If a larger sized reinforcing yarn is used, only one such yarn inserted every n th end and/or pick may provide sufficient reinforcement to the fabric. Conversely, if a smaller reinforcement yarn is used, two or more ends or picks of such yarns may be desired where reinforcing yarns are provided in the fabric. In some embodiments, the reinforcing yarns comprise 5-40% of the overall fabric weight.
  • the fabrics disclosed herein have a weight between 2-12 ounces per square yard (“osy”), inclusive; 2-10 osy, inclusive; 2-9 osy, inclusive; 2-8 osy, inclusive; 2-7 osy, inclusive; 2-6 osy, inclusive; 2-5 osy, inclusive; 2-4 osy, inclusive; 3-10 osy, inclusive; 3-8 osy, inclusive; 3-6 osy, inclusive; and 3-5 osy, inclusive.
  • the fabric weight is 4-10 osy, inclusive, and/or is less than or equal to 6 osy.
  • Desired colors may be imparted in a variety of ways and with a variety of dyes to the fabrics disclosed herein.
  • the fabrics are printable and/or dyeable with vat dyes to colors and/or patterns that enable the fabrics to comply with various military requirements (including, but not limited to, the color, colorfastness, and IR requirements set forth in sections 3.6 and 3.8 of GL-PD-07-12 and/or sections 3.3.2, 3.3.5, and 3.3.7 of MIL-PRF-EFRCE).
  • such fabrics may be printed in compliance with the such color requirements with vat dyes using known printing techniques.
  • 100% of the fabric surface is vat dye printed.
  • other dyes and dyeing/printing methodologies may be used to color the fabrics.
  • the fabrics contemplated herein are dyed/printed in a solid shade devoid of pattern.
  • Fabrics that may not be—but that are capable of being—dyed and/or printed with vat dyes to colors and/or patterns that comply with the color, colorfastness, and IR requirements set forth in sections 3.6 and 3.8 of GL-PD-07-12 and/or sections 3.3.2, 3.3.5, and 3.3.7 of MIL-PRF-EFRCE are intended to be covered by this patent.
  • each purchase description has different color requirements.
  • the relevant sections of each purchase description that govern the color, colorfastness and IR requirements of a particular pattern is set forth below in Table 1 (for GL-PD-07-12) and Table 2 (for MIL-PRF-EFRCE). It will be obvious to one of skill in the art that a fabric printed with a particular pattern need only satisfy the requirements specified for that particular pattern.
  • Table 3 sets forth performance data for printed versions of the Modacrylic Blend Ripstop, High Strength Modacrylic Blend Ripstop, and High Strength Modacrylic Blend Twill and compares that data against the applicable requirements of GL-PD-07-12, MIL-PRF-EFRCE, and ASTM F 1506.
  • the Modacrylic Blend Ripstop, High Strength Modacrylic Blend Ripstop, and High Strength Modacrylic Blend Twill surpass almost every required fabric property set forth in the purchase descriptions.
  • these fabrics exceed the tear strength requirements despite being of lighter weights than specified in the purchase descriptions.
  • Tear strength is a measure of the amount of force required to propagate in a fabric a tear after its initiation.
  • the tear strength of fabrics is measured pursuant to ASTM D1424-09 ( Standard Test Method for Tearing Strength of Fabrics by Falling - Pendulum ( Elmendorf - Type ) Apparatus (2013 edition), incorporated by reference), and the results are reported in pounds force (lbf).
  • a slit of a specified size is cut into a fabric sample of a specified size.
  • a clamp positioned on the fabric sample on each side of the slit to support the fabric sample.
  • a weighted pendulum is released and swings down to apply a force to the fabric sample. The amount of force required to propagate the existing tear in the fabric is measured and that amount of force represents the tear strength of the fabric.
  • the tear strength of fabrics according to embodiments of the invention can be enhanced by inclusion of the reinforcing yarns (such as, e.g., stretch broken and/or filaments yarns, as discussed above) in the fabric.
  • the reinforcing yarns such as, e.g., stretch broken and/or filaments yarns, as discussed above.
  • This can be seen, for example, by comparing the tear strength of the Modacrylic Blend Ripstop (devoid of nylon filament yarns) against the stronger High Strength Modacrylic Blend Ripstop and High Strength Modacrylic Blend Twill, which each include nylon filament reinforcing yarns (see Table 3 above).
  • Some embodiments of the fabrics have tear strengths greater or equal to 14 pounds force in one or both of the warp and fill directions. Some embodiments of the fabrics (particularly, but not necessarily, those having reinforcing yarns) have tear strengths greater or equal to 14 pounds force in one or both of the warp and fill directions while being of relatively low weight (6 osy or less). Some embodiments of the fabrics (particularly, but not necessarily, those having reinforcing yarns) have tear strengths greater or equal to 16 pounds force in one or both of the warp and fill directions.
  • Some embodiments of the fabrics have tear strengths greater or equal to 16 pounds force in one or both of the warp and fill directions while being of relatively low weight (6 osy or less). Some embodiments of the fabrics (particularly, but not necessarily, those having reinforcing yarns) have tear strengths greater or equal to 19 pounds force in one or both of the warp and fill directions. Some embodiments of the fabrics (particularly, but not necessarily, those having reinforcing yarns) have tear strengths greater or equal to 19 pounds force in one or both of the warp and fill directions while being of relatively low weight (6 osy or less).
  • Some embodiments of the fabrics have tear strengths greater or equal to 21 pounds force in one or both of the warp and fill directions. Some embodiments of the fabrics (particularly, but not necessarily, those having reinforcing yarns) have tear strengths greater or equal to 21 pounds force in one or both of the warp and fill directions while being of relatively low weight (6 osy or less).
  • inclusion of reinforcing yarns increases the tear strength of the fabric (in either or both of the warp direction and fill direction) by at least 50%; at least 60%; at least 70%; at least 80%; at least 90%; at least 100%; at least 105%; at least 120%; at least 140%; and/or at least 170%.
  • Such improvement in tear strength can be seen by comparing the tear strength of the fabric formed only with spun body yarns against the tear strength of an otherwise identical fabric that is formed with the same spun body yarns but with reinforcing yarns as well.
  • Such improvement in tear strength can been see, for example, by comparing the tear strength results of the Modacrylic Blend Ripstop against the High Strength Modacrylic Blend Ripstop in Table 3.
  • the tear strength of the greige fabrics identified in Table 4 were tested. More specifically, four woven fabrics were formed, each with one of the body yarn types identified in Table 4.
  • the first fabric was formed with body yarns having a 65/25/10 FR rayon/para-aramid/nylon fiber blend.
  • the second fabric was formed with body yarns having a 93/5/2 meta-aramid/para-aramid/anti-static fiber blend.
  • the third fabric was formed with body yarns having a 48/37/15 modacrylic/lyocell/para-aramid fiber blend.
  • the fourth fabric was formed with body yarns having a 55/25/20 modacrylic/nylon/lyocell fiber blend and represents an embodiment of a fabric made pursuant to the present invention.
  • the fabrics were woven both without reinforcing yarns (i.e., the fabrics only included body yarns) and with identical reinforcing yarns.
  • the break or tensile strength of the body yarns and reinforcing yarns was measured (pursuant to ASTM D5034 ( Standard Test Method for Breaking Strength and Elongation of Textile Fabrics ( Grab Test ) (2013 edition)), and the results were reported in pounds force.
  • ASTM D5034 Standard Test Method for Breaking Strength and Elongation of Textile Fabrics ( Grab Test ) (2013 edition)
  • the tear strength of the fabrics in the fill direction, both with and without reinforcing yarns was also measured (pursuant to ASTM D1424).
  • the results are graphically represented in Graph 1.
  • the reinforcing yarns were significantly more effective when included in a fabric having weaker body yarns.
  • the first fabric has body yarns that are significantly stronger than those of the fourth fabric.
  • inclusion of the same reinforcing yarns in each of these fabrics increased the overall tear strength of each fabric.
  • the efficacy of such reinforcing yarns in fabrics made from weaker yarns Inclusion of the reinforcing yarns in the fabric with the strongest body yarns (the first fabric) only resulted in a 16% improvement in fabric tear strength.
  • inclusion of the same reinforcing yarns in the fabric with the weakest body yarns (the fourth fabric) led to a 57% increase in fabric tear strength.
  • the tear strength of the reinforced fabric formed with the weaker yarns actually surpassed the tear strength of the reinforced fabric formed with the strongest yarns.
  • Embodiments of the fabrics disclosed herein are printable and/or dyeable with vat dyes so as to comply with at least one of the following:
  • High Strength Modacrylic Blend Twill fabric was vat dye printed with the Class 3, Operational Camouflage Pattern (OCP) pattern specified in GL-PD-07-12, section 3.6.1.3.
  • OCP Operational Camouflage Pattern
  • Table 5 compares the colorfastness of the High Strength Modacrylic Blend Twill fabric with the OCP pattern against the colorfastness requirements for that pattern (GL-PD-07-12, section 3.6.3 and Table I.B).
  • Table 6 compares the spectral or near IR reflectance of the High Strength Modacrylic Blend Twill fabric with the OCP pattern against the spectral reflectance requirements for that pattern (GL-PD-07-12, section 3.8.3 and Table II.B).
  • the High Strength Modacrylic Blend Twill fabric with the OCP pattern passed all of the applicable colorfastness and near IR reflectance requirements for that pattern.
  • Fabrics according to some embodiments of the invention are self-extinguishing, exhibit no melt or drip when exposed to a flame or thermal event, and/or have an afterflame of less than or equal to two seconds when tested in accordance with ASTM D6413. While the char lengths of the tested fabrics failed to comply with the requirements of GL-PD-07-12 and MIL-PRF-EFRCE, fabrics according to some embodiments of the invention have a char length of 6 inches or less and of 7 inches or less, when tested pursuant to ASTM D6413.
  • Embodiments of the flame resistant fabrics disclosed herein can be used to construct the entirety of, or various portions of, a variety of protective garments for use in military applications and/or electrical applications, including, but not limited to, combat uniforms, coveralls, jumpsuits, shirts, jackets, vests, and trousers.
  • Low weight versions (e.g., 6 osy or less) of fabrics disclosed herein may be particularly suitable for inclusion in uniforms for use in hot and hot/humid environments, such as deserts, jungles, and other tropical environments.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Mechanical Engineering (AREA)
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  • Yarns And Mechanical Finishing Of Yarns Or Ropes (AREA)
  • Knitting Of Fabric (AREA)

Abstract

Flame resistant fabrics comprising a blend of modacrylic, aliphatic polyamide, and cellulosic fibers. Some embodiments are printed and/or dyed with vat dyes so as to comply with the color requirements (including the color, colorfastness, and IR requirements) set forth in the relevant sections of GL-PD-07-12 and/or MIL-PRF-EFRCE. Some embodiments further include reinforcing yarns that improve the strength of the fabrics. Still other embodiments are flame resistant fabrics for use in electrical applications that comply with some or all of the requirements of ASTM F 1506.

Description

    CROSS REFERENCE TO RELATED APPLICATIONS
  • This application claims the benefit of U.S. Provisional Application Ser. No. 62/244,337, filed on Oct. 21, 2015, entitled “Low Cost, Printable Flame Resistant Fabric for Combat Uniforms,” the entirety of which is hereby incorporated by this reference.
    • FIELD
  • Embodiments of the present invention relate to flame resistant fabrics for inclusion into protective garments for military and electrical applications.
    • BACKGROUND
  • Protective garments are designed to protect the wearer from hazardous environmental conditions the wearer might encounter. Such garments include those designed to be worn by military personnel, as well as firefighters and other rescue personnel and industrial and electrical workers.
  • Standards have been promulgated that govern the performance of such garments (or constituent fabrics of such garments) to ensure that the garments sufficiently protect the wearer in hazardous situations.
    • Military
  • GL-PD-07-12, Rev. 8 (Purchase Description: Cloth, Flame Resistant, Nov. 26, 2014, incorporated herein by reference) and MIL-PRF-EFRCE (Purchase Description: Uniform, Enhanced Flame Resistant Combat Ensemble (EFRCE) Blouse and Trouser, September 2015, incorporated herein by reference) are military purchase descriptions that set forth the performance requirements for fabrics used in flame resistant garments for the army (GL-PD-07-12) and marines (MIL-PRF-EFRCE).
  • Both purchase descriptions (GL-PD-07-12 and MIL-PRF-EFRCE) include color requirements for military fabrics. More specifically, both address the color shades and camouflage patterns to which the fabrics must be colored, depending on the environment in which the uniforms are intended to be worn. GL-PD-07-12, section 3.6.1; MIL-PRF-EFRCE, sections 3.3.2 and 3.3.4. GL-PD-07-12 identifies the following three camouflage patterns:
      • Class 1, Universal Camouflage Pattern (UCP) (section 3.6.1.1);
      • Class 2, Operation Enduring Freedom Camouflage Pattern (OEF-CP) (section 3.6.1.2); and
      • Class 3, Operational Camouflage Pattern (OCP) (section 3.6.1.3). MIL-PRF-EFRCE identifies the following fabric types and colors/patterns:
      • Cloth Type I (woven Woodland, Marine Corps Pattern (MARPAT) camouflage printed) (sections 1.2.1 and 3.3.2.1);
      • Cloth Type II (woven Desert MARPAT camouflage printed) (sections 1.2.1 and 3.3.2.2);
      • Cloth Type III (woven Navy Working Uniform (NWU) II, Desert Digital camouflage printed) (sections 1.2.1 and 3.3.2.3);
      • Cloth Type IV (woven NWUIII, Woodland Digital camouflage printed) (sections 1.2.1 and 3.3.2.4); and
      • Cloth Type V (knit Coyote 498 solid) (sections 1.2.1 and 3.3.2.5).
  • Both purchase descriptions set forth colorfastness requirements for fabrics bearing each of the different colors shades and patterns to ensure that the fabrics retain the desired shade of color after laundering and environmental exposures (e.g., light, perspiration, etc.). GL-PD-07-12, section 3.6.3 and Table I (Class 1), Table LA (Class 2), and Table I.B (Class 3); MIL-PRF-EFRCE, section 3.3.5 and Tables I and II.
  • The purchase descriptions both also contain spectral or near infrared reflectance requirements (“IR requirements”) to help ensure that fabrics complying with such IR requirements provide better camouflage in the infra-red wavelengths of light used by most night-vision devices. GL-PD-07-12, section 3.8 and Table II (Class 1), Table II.A (Class 2), and Table II.B (Class 3); MIL-PRF-EFRCE, section 3.3.7 and Table III (Cloth Type I), Table IV (Cloth Type II), and Table V (Cloth Type V). In other words, the camouflage fabrics blend into the background when viewed using night vision equipment.
    • Electrical
  • Many occupations can potentially expose an individual to electrical arc flash and/or flames. Workers who may be exposed to accidental electric arc flash and/or flames risk serious burn injury unless they are properly protected. To avoid being injured while working in such conditions, these individuals typically wear protective garments constructed of flame resistant materials designed to protect them from electrical arc flash and/or flames. Such protective clothing can include various garments, for example, coveralls, pants, and shirts. Standards have been promulgated that govern the performance of such garments (or constituent layers or parts of such garments) to ensure that the garments sufficiently protect the wearer in hazardous situations. Fabrics from which some such garments are constructed, and consequently the resulting garments as well, are required to pass a variety of safety and/or performance standards, including ASTM F 1506 (Standard Performance Specification for Flame Resistant and Arc Rated Textile Materials for Wearing Apparel for Use by Electrical Workers Exposed to Momentary Electric Arc and Related Thermal Hazards, 2015 edition, incorporated herein by reference).
  • ASTM F 1506 requires that the garments and/or individual layers or parts thereof pass a number of different performance tests. Table 1 of ASTM F 1506 sets forth requirements for woven fabrics, including (among others) strength requirements (e.g., tensile strength, tear strength), colorfastness and laundry shrinkage requirements, and thermal protective requirements (e.g., minimal char length and afterflame requirements). As indicted in Table 1, such requirements may differ depending on the weight of the woven fabric tested. Table 2 of F 1506 sets forth the same property requirements for knitted fabrics.
  • ASTM F 1506 requires all fabrics (woven or knitted) to have a char length of 6 inches or less and have a two second (or less) afterflame, when measured pursuant to the testing methodology set forth in ASTM D6413 (Standard Test Method for Flame Resistance of Textiles, 2015 edition, incorporated herein by reference). To test for char length and afterflame, a fabric specimen is suspended vertically over a flame for twelve seconds. The fabric must self-extinguish within two seconds (i.e., it must have a 2 second or less afterflame). After the fabric self-extinguishes, a specified amount of weight is attached to the fabric and the fabric lifted so that the weight is suspended from the fabric. The fabric will typically tear along the charred portion of the fabric. The length of the tear (i.e., the char length) must be 6 inches or less when the test is performed in both the machine/warp and cross-machine/fill directions of the fabric. A fabric sample is typically tested for compliance both before it has been washed (and thus when the fabric still contains residual—and often flammable—chemicals from finishing processes) and after a certain number of launderings (e.g., 25 launderings for ASTM F 1506).
    • SUMMARY
  • The terms “invention,” “the invention,” “this invention” and “the present invention” used in this patent are intended to refer broadly to all of the subject matter of this patent and the patent claims below. Statements containing these terms should not be understood to limit the subject matter described herein or to limit the meaning or scope of the patent claims below. Embodiments of the invention covered by this patent are defined by the claims below, not this summary. This summary is a high-level overview of various aspects of the invention and introduces some of the concepts that are further described in the Detailed Description section below. This summary is not intended to identify key or essential features of the claimed subject matter, nor is it intended to be used in isolation to determine the scope of the claimed subject matter. The subject matter should be understood by reference to the entire specification of this patent, all drawings and each claim.
  • Embodiments of the invention relate to flame resistant fabrics comprising a blend of modacrylic, aliphatic polyamide, and cellulosic fibers. Some embodiments are printed and/or dyed with vat dyes so as to comply with the color requirements (including the color, colorfastness, and IR requirements) set forth in the relevant sections of GL-PD-07-12 and/or MIL-PRF-EFRCE. Some embodiments further include reinforcing yarns that improve the strength of the fabrics. Still other embodiments are flame resistant fabrics for use in electrical applications that comply with some or all of the requirements of ASTM F 1506.
    • DETAILED DESCRIPTION
  • The subject matter of embodiments of the present invention is described here with specificity to meet statutory requirements, but this description is not necessarily intended to limit the scope of the claims. The claimed subject matter may be embodied in other ways, may include different elements or steps, and may be used in conjunction with other existing or future technologies. This description should not be interpreted as implying any particular order or arrangement among or between various steps or elements except when the order of individual steps or arrangement of elements is explicitly described.
  • Some embodiments of the invention include flame resistant fabrics suitable for use in military uniforms. Such embodiments of the fabrics preferably comply with the relevant color requirements (including the color, colorfastness, and IR requirements) set forth in sections 3.6 and 3.8 of GL-PD-07-12 and sections 3.3.2, 3.3.5, and 3.3.7 of MIL-PRF-EFRCE. Moreover, some embodiments of the fabrics are low weight and fast drying, rendering them particularly suitable for hot and hot/humid conditions in that such fabrics manage moisture effectively and dry quickly.
  • Other embodiments of the invention include flame resistant fabrics that comply with requirements of ASTM F 1506 and thus are suitable for electrical worker applications.
  • The fabrics may be woven or knitted from a combination of spun yarns containing a blend of different types of fibers. The spun yarns in the fabric may all have the same fiber blend, or the fabric may be formed with spun yarns having different fiber blends.
  • At least some of the spun yarns are formed of a blend that includes modacrylic fibers. Examples of suitable modacrylic fibers are PROTEX™ fibers available from Kaneka Corporation of Osaka, Japan, SEF™ available from Solutia, PyroTex® available from PyroTex Fibers GmbH, or blends thereof. The modacrylic fibers may constitute 30-80%, inclusive; 35-70%, inclusive; and 40-60%, inclusive, of the fiber blend.
  • In addition to modacrylic fibers, the blend may also include aliphatic polyamides to increase the fabric strength and abrasion resistance. Nylon or flame resistant (“FR”) nylon, Nylon XF, and Nylon HT are examples of suitable aliphatic polyamides for use in the blend. In some embodiments, aliphatic polyamide fibers (such as nylon and/or FR nylon fibers) constitute 5-50%, inclusive; 10-45%, inclusive; 10-35%, inclusive; 15-30%, inclusive; and 20-30%, inclusive of the fiber blend.
  • The fiber blend may further include FR or non-FR cellulosic fibers, including, but not limited to, natural and synthetic cellulosic fibers (e.g., cotton, rayon, acetate, triacetate, and lyocell, as well as their flame resistant counterparts FR cotton, FR rayon, FR acetate, FR triacetate, and FR lyocell). Examples of rayon fibers include Viscose™ and Modal™ by Lenzing, available from Lenzing Fibers Corporation. An example of an FR rayon material is Lenzing FR™, also available from Lenzing Fibers Corporation, and VISIL™, available from Sateri. Examples of lyocell fibers include TENCEL™, TENCEL G100™ and TENCEL A100™, all available from Lenzing Fibers Corporation.
  • In some embodiments, synthetic cellulosic fibers are included in the fiber blend. In one embodiment, FR or non-FR lyocell fibers are included in the blend. In some embodiments, non-FR cellulosic fibers (such as non-FR lyocell fibers) constitute 10-60%, inclusive; 10-55%, inclusive; 10-50%, inclusive; 10-45%, inclusive; 10-40%, inclusive; and 20-40%, inclusive, of the fiber blend. In other embodiments, FR cellulosic fibers (such as FR lyocell fibers) constitute 10-80%, inclusive; 15-75%, inclusive; 15-65%, inclusive; 15-50%, inclusive; 20-40%, inclusive; 10-40%, inclusive; and 15-35%, inclusive, of the fiber blend.
  • In one specific, non-limiting embodiment, the fiber blend includes a blend of modacrylic, nylon, and cellulosic fibers (e.g., synthetic cellulosic fibers such as lyocell fibers). For example, in one embodiment the spun yarns are formed from a fiber blend having approximately 30-80% modacrylic fibers, approximately 10-60% cellulosic fibers (e.g., synthetic cellulosic), and approximately 5-50% nylon fibers. In yet another embodiment, the spun yarns are formed from a fiber blend having approximately 35-70% modacrylic fibers, approximately 10-50% cellulosic fibers (e.g., synthetic cellulosic), and approximately 10-40% nylon fibers. For example, in still another embodiment the spun yarns are formed from a fiber blend having approximately 40-65% modacrylic fibers, approximately 10-40% cellulosic fibers (e.g., synthetic cellulosic), and approximately 15-40% nylon fibers. The cellulosic fibers (such as lyocell) and nylon fibers used in these blends can be FR or non-FR. The spun yarns of these embodiments are devoid of additional inherently flame resistant fibers, such as aramid fibers. The same types of modacrylic fibers, cellulosic fibers, and nylon fibers need not be used in the blend. Rather, multiple types of each may be blended together.
  • The cellulosic fibers are provided in the blend to increase the comfort and moisture management of the fabric. In some embodiments, however, it may be desirable (but not required) to use lower levels of cellulosic fibers to help reduce fabric drying time. In some embodiments, the cellulosic fibers constitute less of the fiber blend than the nylon fibers.
  • Given the flammable nature of non-FR nylon and non-FR synthetic cellulosic fibers (at least as compared to FR fibers), it may be advisable in some embodiments to ensure that the modacrylic fibers constitute more of the fiber blend than each of the non-FR nylon and non-FR lyocell fibers. The modacrylic fibers control and counteract the flammability of the non-FR nylon and non-FR lyocell fibers to prevent them from burning. It may be preferable in some embodiments to ensure that the modacrylic fibers constitute more of the fiber blend that the non-FR nylon and non-FR lyocell fibers combined. In some embodiments, the fiber blend is devoid of other FR fibers typically used in FR fabrics to impart FR properties to the fabrics, such as, but not limited to, aramid fibers such as meta- and para-aramid fibers.
  • However, in other embodiments other fibers are added to the fiber blend of the spun yarns, including, but not limited to, additional inherently FR fibers and/or non-inherently FR fibers (FR or non-FR). Exemplary suitable FR and non-FR fibers include, but are not limited to, para-aramid fibers, meta-aramid fibers, polybenzoxazole (“PBO”) fibers, polybenzimidazole (“PBI”) fibers, poly{2,6-diimidazo [4,5-40; 50-e]-pyridinylene-1,4(2,5-dihydroxy)phenylene} (“PIPD”) fibers, ultra-high molecular weight (UHMW) polyethylene fibers, UHMW polypropylene fibers, polyvinyl alcohol fibers, polyacrylonitrile (PAN) fibers, liquid crystal polymer fibers (e.g., aromatic polyesters such as VECTRAN), glass fibers, polynosic rayon fibers, carbon fibers, silk fibers, polyamide fibers, polyester fibers, aromatic polyester fibers, TANLON™ fibers (available from Shanghai Tanlon Fiber Company), wool fibers, melamine fibers (such as BASOFIL™, available from Basofil Fibers), polyetherimide fibers, polyethersulf one fibers, pre-oxidized acrylic fibers, polyamide-imide fibers such as KERMEL™, polytetrafluoroethylene fibers, polyvinyl chloride fibers, polyetheretherketone fibers, polyetherimide fibers, polychlal fibers, polyimide fibers, polyamide fibers, polyimideamide fibers, polyolefin fibers, polyacrylate fibers, and any combination or blend thereof. In some embodiments, however, embodiments of the fabrics contemplated herein are devoid of any and/or all of these additional inherently FR fibers and/or non-inherently FR fibers (FR or non-FR).
  • Examples of para-aramid fibers include KEVLAR™ (available from DuPont), TECHNORA™ (available from Teijin Twaron BV of Arnheim, Netherlands), and TWARON™ (also available from Teijin Twaron BV). Examples of meta-aramid fibers include NOMEX™ (available from DuPont), CONEX™ (available from Teijin), and APYEIL™ (available from Unitika). An example of a polyester fiber is DACRON® (available from Invista™). An example of a PIPD fiber includes M5 (available from Dupont). An example of melamine fibers is BASOFIL™ (available from Basofil Fibers). An example of PAN fibers is Panox® (available from the SGL Group). Examples of UHMW polyethylene materials include Dyneema and Spectra. An example of a liquid crystal polymer material is VECTRAN™ (available from Kuraray).
  • Moreover, anti-static fibers, anti-microbial fibers, and/or stretch fibers may also be added to the blend.
  • The spun yarns can be formed in conventional ways well known in the industry. The spun yarns can comprise a single yarn or two or more individual yarns that are twisted, plied, or otherwise combined together.
  • The spun yarns can subsequently be used to form fabrics in a variety of ways, all well known in the industry. The yarns can be knitted or woven. In one embodiment, the fabric is formed as a plain weave fabric or a twill weave (e.g. 2×1 twill) fabric that comprises a plurality of body yarns. However, it will be appreciated that other configurations could be used including, for instance, a rip-stop weave, sateen weave, etc.
  • Some embodiments of the present invention incorporate into the fabric reinforcing yarns intended to enhance the strength properties (tensile, tear, etc.) of the fabric. The reinforcing yarns may be spun yarns (such as, but not limited to, those described above), continuous filament yarns, stretch broken yarns, and combinations thereof. The reinforcing yarns may be of any size (i.e., of any cotton count or denier). The reinforcing yarns may be formed from a variety of different materials, including, but not limited to, polyamides (e.g., nylon), high density polyethylene, rayon (FR or non-FR), polyester, aramids (meta-aramid and para-aramid), as well as the other inherently FR fibers and/or non-inherently FR fibers (FR or non-FR) identified above. In some embodiments, the reinforcing yarns are nylon continuous filament yarns.
  • In some embodiments, the body of the fabric is formed of spun yarns (such as those described above) and the reinforcing yarns are provided in one or both of the machine/warp and cross-machine/fill directions of the fabric. In some embodiments, the reinforcing yarns are provided in both the machine/warp and cross-machine/fill directions of the fabric so as to create a grid-like pattern. The occurrence of the reinforcing yarns may be the same or different in each fabric direction. The reinforcing yarns may be provided in isolation or may be combined, coupled, or covered (i.e., plied, ply twist, wrapped, coresheath, coverspun, etc.) with one or more other yarns (or staple fibers).
  • The reinforcing yarns may be provided at any frequency within the fabric. For example, a reinforcing yarn may be provided every nth end or pick. The frequency at which reinforcing yarns are used (i.e., the value of “n”) can be the same or different (1) within a direction of the fabric and/or (2) in different directions of the fabric. In some embodiments, the value of “n” can be anywhere between 1-60, inclusive; 1-50, inclusive; 1-40, inclusive; 1-30, inclusive; 1-20, inclusive; 1-10, inclusive; and 1-5, inclusive, such that at least (n-1) ends or picks of body yarns are positioned between the adjacent reinforcing yarns that are separated by body yarns.
  • Moreover, it is also contemplated that two or more reinforcing yarns may be provided directly adjacent each other (i.e., not separated from each other by body yarns) in one or both directions of the fabric. In other words, at least some occurrences of reinforcing yarns in the fabric may include three reinforcing yarns in a row, four reinforcing yarns in a row, five reinforcing yarns in a row, etc.
  • The frequency of the occurrence of reinforcing yarns as well as the number of reinforcing yarns provided at each such occurrence may depend on the desired strength properties of the fabric as well as the size of the reinforcing yarns. If a larger sized reinforcing yarn is used, only one such yarn inserted every nth end and/or pick may provide sufficient reinforcement to the fabric. Conversely, if a smaller reinforcement yarn is used, two or more ends or picks of such yarns may be desired where reinforcing yarns are provided in the fabric. In some embodiments, the reinforcing yarns comprise 5-40% of the overall fabric weight.
  • In some embodiments, the fabrics disclosed herein have a weight between 2-12 ounces per square yard (“osy”), inclusive; 2-10 osy, inclusive; 2-9 osy, inclusive; 2-8 osy, inclusive; 2-7 osy, inclusive; 2-6 osy, inclusive; 2-5 osy, inclusive; 2-4 osy, inclusive; 3-10 osy, inclusive; 3-8 osy, inclusive; 3-6 osy, inclusive; and 3-5 osy, inclusive. In some embodiments, the fabric weight is 4-10 osy, inclusive, and/or is less than or equal to 6 osy.
  • Desired colors may be imparted in a variety of ways and with a variety of dyes to the fabrics disclosed herein. In some embodiments, the fabrics are printable and/or dyeable with vat dyes to colors and/or patterns that enable the fabrics to comply with various military requirements (including, but not limited to, the color, colorfastness, and IR requirements set forth in sections 3.6 and 3.8 of GL-PD-07-12 and/or sections 3.3.2, 3.3.5, and 3.3.7 of MIL-PRF-EFRCE). For example, such fabrics may be printed in compliance with the such color requirements with vat dyes using known printing techniques. In some embodiments, 100% of the fabric surface is vat dye printed. However, other dyes and dyeing/printing methodologies may be used to color the fabrics. Moreover, some embodiments are the fabrics contemplated herein are dyed/printed in a solid shade devoid of pattern.
  • Fabrics that may not be—but that are capable of being—dyed and/or printed with vat dyes to colors and/or patterns that comply with the color, colorfastness, and IR requirements set forth in sections 3.6 and 3.8 of GL-PD-07-12 and/or sections 3.3.2, 3.3.5, and 3.3.7 of MIL-PRF-EFRCE are intended to be covered by this patent.
  • The different patterns specified in each purchase description have different color requirements. The relevant sections of each purchase description that govern the color, colorfastness and IR requirements of a particular pattern is set forth below in Table 1 (for GL-PD-07-12) and Table 2 (for MIL-PRF-EFRCE). It will be obvious to one of skill in the art that a fabric printed with a particular pattern need only satisfy the requirements specified for that particular pattern.
  • TABLE 1
    (GL-PD-07-12 Requirements)
    GL-PD-07-12 GL-PD-07-12
    Color Colorfastness GL-PD-07-12
    Pattern Requirement Requirement IR Requirement
    Class 1, Universal section 3.6.1.1 section 3.6.3, section 3.8.1,
    Camouflag Pattern Table I Table II
    (UCP)
    Class 2, Operation section 3.6.1.2 section 3.6.3, section 3.8.2,
    Enduring Freedom Table I.A Table II.A
    Camouflage Pattern
    (OEF-CP)
    Class 3, Operational section 3.6.1.3 section 3.6.3, section 3.8.3,
    Camouflage Pattern Table I.B Table II.B
    (OCP)
  • TABLE 2
    (MIL-PRF-EFRCE Requirements)
    MIL-PRF-EFRCE MIL-PRF-EFRCE MIL-PRF-EFRCE
    Color Colorfastness IR
    Pattern Requirement Requirement Requirement
    Cloth Type I section 3.3.2.1 section 3.3.5, section 3.3.7.1
    (Woodland Table I
    MARPAT)
    Cloth Type II section 3.3.2.2 section 3.3.5, section 3.3.7.2
    (Desert Table I
    MARPAT)
    Cloth Type III section 3.3.2.3 section 3.3.5, section 3.3.7.3
    (NWU II) Table I
    Cloth Type IV section 3.3.2.4 section 3.3.5, section 3.3.7.3
    (NWUIII) Table I
    Cloth Type V section 3.3.2.5 section 3.3.5, section 3.3.7.4
    (Coyote solid) Table II
  • Specific, non-limiting examples of fabrics in accordance with embodiments of the invention are described as follows:
      • Modacrylic Blend Ripstop: A 5.4 osy fabric formed of spun yarns comprising 55% modacrylic fibers, 25% non-FR nylon fibers, and 20% non-FR lyocell fibers. The fabric is a plain weave with a ripstop provided every 20th and 21st end and every 11th and 12th pick.
      • High Strength Modacrylic Blend Ripstop: A 5.6 osy fabric formed of spun yarns comprising 55% modacrylic fibers, 25% non-FR nylon fibers, and 20% non-FR lyocell fibers. The fabric is a plain weave ripstop whereby two reinforcing yarns, each formed of a 100 denier nylon continuous filament yarn plied with a 20 singles spun yarn (the same as used in the rest of the fabric), are provided every 20th and 21st end and every 11th and 12th pick.
      • High Strength Modacrylic Blend Twill: A 5.6 osy fabric formed of spun yarns comprising 55% modacrylic fibers, 25% non-FR nylon fibers, and 20% non-FR lyocell fibers. The fabric is a twill weave with two reinforcing yarns, each formed of a 100 denier nylon continuous filament yarn plied with a 20 singles spun yarn (the same as used in the rest of the fabric), provided every 20th an 21st end and every 11th and 12th pick.
  • Table 3 sets forth performance data for printed versions of the Modacrylic Blend Ripstop, High Strength Modacrylic Blend Ripstop, and High Strength Modacrylic Blend Twill and compares that data against the applicable requirements of GL-PD-07-12, MIL-PRF-EFRCE, and ASTM F 1506.
  • TABLE 3
    GL PD 07 12 MIL-PRF-
    Purchase EFRCE ASTM F
    Description, Purchase 1506-10a
    Modacrylic High Strength High Strength Section 3.9, Description, Standard
    Blend Modacrylic Modacrylic Table III, Section Performance
    Characteristic Ripstop Blend Ripstop Blend Twill Type III 3.3.1, Table 1 Specification Test Method
    Fiber Blend
    (% Fiber)
    Modacrylic 55 55 55 — — — AATCC 20
    Nylon (non-FR) 25 25 25 — — —
    Lyocell (non-FR) 20 20 20 — — —
    Yarns in grid 20/1's spun 100 d filament 100 d filament N/A N/A N/A N/A
    yarn nylon plied with nylon plied with
    20/1's spun yarn 20/1's spun yarn
    Warp grid yarns ends 20 & 21 ends 20 & 21 ends 20 & 21 N/A N/A N/A N/A
    (weave as one) (weave as one) (weave separate)
    Fill grid yarns picks 11 & 12 picks 11 &12 picks 11 & 12 N/A N/A N/A N/A
    (weave as one) (weave as one) (weave as one)
    Construction 85 × 56 81 × 53 77 × 55     60 × 50 (min) N/A N/A ASTM D 3775
    (w × f)
    Weight (oz/yd2) 5.4 5.6 5.6 6.0-7.0 6.4-7.1 3.0-5.9 ASTM D 3776
    Elmendorf Tear
    Strength
    (lbf, w × f)
    Dry 7.7 × 6.2 17.2 × 18.6 22.4 × 23.5 12.0 × 10.0 (min)  12 × 16 (min) 2.5 (min) ASTM 1424
    Wet 8.7 × 6.1 18.7 × 22.9 21.9 × 22.4  8.0 × 6.0 (min)  12 × 16 (min) N/A
    Tensile Strength
    (lbf, w × f)
    Dry 106 × 73  111 × 72  157 × 102   110 × 100 (min) 165 × 150 (min)   30 (min) ASTM D 5034
    Wet 95 × 68 101 × 68  145 × 92  N/A 140 × 125 (min)  N/A
    Flame Resistance
    Before Laundering
    (w × f)
    After Flame (sec) 0 × 0 0 × 0 0 × 0  2.0 × 2.0 (max) 2.0 × 2.0 (max) 2.0 × 2.0 (max) ASTM D 6413
    Char Length (in) 5.6 × 5.5 6.4 × 6.1 6.0 × 5.7  4.5 × 4.5 (max) 5.0 × 5.0 (max) 6.0 × 6.0 (max)
    Melt/Drip None None None None None N/A
    Laundered 25×
    (w × f)
    After Flame (Sec) 0 × 0 0 × 0 0 × 0  2.0 × 2.0 (max) 2.0 × 2.0 (max) 2.0 × 2.0 (max) AATCC 135,
    Char Length (in) 5.5 × 5.8 5.3 × 6.3 5.7 × 6.4  4.5 × 4.5 (max) 5.0 × 5.0 (max) 6.0 × 6.0 (max) 3,V, Aiii
    Melt/Drip None None None None None N/A
    Arc Test Results
    (single layer):
    Afterflame Time Less than 5 Less than 5 Less than 5 N/A N/A   5 (max) ASTM F 1959
    (sec)
    Laundry Shrinkage
    (% change, w × f)
    Laundered 5× 0.8 × 0.7 1.4 × 0.8 1.4 × 1.4  4.0 × 4.0 (max) 5.0 × 5.0 (max) 3.0 × 3.0 (max) GL-PD-07-12:
    (AATCC 135, (AATCC 135, (AATCC 135, (AATCC 135, (AATCC 96 (AATCC 135, AATCC 135,
    3, V, Aiii) 3, V, Aiii) 3, V, Aiii) 3, V, Aiii) Vic, Dry A) 3, IV, Aiii) 3, V, Aiii
    MIL-PRF-
    EFRCE:
    AATCC
    96 Vic, Dry A
    ASTM F 1506-
    10a: AATCC
    135, 3, IV, Aiii
    Air Permeability 44.8 76.3 85.1 25.0 (min) 20.0 (min) N/A ASTM D 737
    (ft.3/min./ft.2)
    Colorfastness:
    Laundering shade Complies Complies Complies N/A N/A Class 3 (min) AATCC 612A,
    change 1× AATCC 132
    Dry-cleaning Complies Complies Complies N/A N/A Class 3 (min)
    shade change

    All of the testing methodologies referenced throughout this document are hereby incorporated by reference.
  • With respect to GL-PD-07-12 and MIL-PRF-EFRCE, the Modacrylic Blend Ripstop, High Strength Modacrylic Blend Ripstop, and High Strength Modacrylic Blend Twill surpass almost every required fabric property set forth in the purchase descriptions. For example, these fabrics exceed the tear strength requirements despite being of lighter weights than specified in the purchase descriptions.
  • Tear strength is a measure of the amount of force required to propagate in a fabric a tear after its initiation. The tear strength of fabrics is measured pursuant to ASTM D1424-09 (Standard Test Method for Tearing Strength of Fabrics by Falling-Pendulum (Elmendorf-Type) Apparatus (2013 edition), incorporated by reference), and the results are reported in pounds force (lbf).
  • Pursuant to ASTM D1424-09, a slit of a specified size is cut into a fabric sample of a specified size. A clamp positioned on the fabric sample on each side of the slit to support the fabric sample. A weighted pendulum is released and swings down to apply a force to the fabric sample. The amount of force required to propagate the existing tear in the fabric is measured and that amount of force represents the tear strength of the fabric.
  • The tear strength of fabrics according to embodiments of the invention can be enhanced by inclusion of the reinforcing yarns (such as, e.g., stretch broken and/or filaments yarns, as discussed above) in the fabric. This can be seen, for example, by comparing the tear strength of the Modacrylic Blend Ripstop (devoid of nylon filament yarns) against the stronger High Strength Modacrylic Blend Ripstop and High Strength Modacrylic Blend Twill, which each include nylon filament reinforcing yarns (see Table 3 above).
  • Some embodiments of the fabrics (particularly, but not necessarily, those having reinforcing yarns) have tear strengths greater or equal to 14 pounds force in one or both of the warp and fill directions. Some embodiments of the fabrics (particularly, but not necessarily, those having reinforcing yarns) have tear strengths greater or equal to 14 pounds force in one or both of the warp and fill directions while being of relatively low weight (6 osy or less). Some embodiments of the fabrics (particularly, but not necessarily, those having reinforcing yarns) have tear strengths greater or equal to 16 pounds force in one or both of the warp and fill directions. Some embodiments of the fabrics (particularly, but not necessarily, those having reinforcing yarns) have tear strengths greater or equal to 16 pounds force in one or both of the warp and fill directions while being of relatively low weight (6 osy or less). Some embodiments of the fabrics (particularly, but not necessarily, those having reinforcing yarns) have tear strengths greater or equal to 19 pounds force in one or both of the warp and fill directions. Some embodiments of the fabrics (particularly, but not necessarily, those having reinforcing yarns) have tear strengths greater or equal to 19 pounds force in one or both of the warp and fill directions while being of relatively low weight (6 osy or less). Some embodiments of the fabrics (particularly, but not necessarily, those having reinforcing yarns) have tear strengths greater or equal to 21 pounds force in one or both of the warp and fill directions. Some embodiments of the fabrics (particularly, but not necessarily, those having reinforcing yarns) have tear strengths greater or equal to 21 pounds force in one or both of the warp and fill directions while being of relatively low weight (6 osy or less).
  • In some embodiments, inclusion of reinforcing yarns (such as, e.g., stretch broken and/or filaments yarns, as discussed above) in the fabric increases the tear strength of the fabric (in either or both of the warp direction and fill direction) by at least 50%; at least 60%; at least 70%; at least 80%; at least 90%; at least 100%; at least 105%; at least 120%; at least 140%; and/or at least 170%. Such improvement in tear strength can be seen by comparing the tear strength of the fabric formed only with spun body yarns against the tear strength of an otherwise identical fabric that is formed with the same spun body yarns but with reinforcing yarns as well. Such improvement in tear strength can been see, for example, by comparing the tear strength results of the Modacrylic Blend Ripstop against the High Strength Modacrylic Blend Ripstop in Table 3.
  • The tear strength of the greige fabrics identified in Table 4 were tested. More specifically, four woven fabrics were formed, each with one of the body yarn types identified in Table 4. In other words, the first fabric was formed with body yarns having a 65/25/10 FR rayon/para-aramid/nylon fiber blend. The second fabric was formed with body yarns having a 93/5/2 meta-aramid/para-aramid/anti-static fiber blend. The third fabric was formed with body yarns having a 48/37/15 modacrylic/lyocell/para-aramid fiber blend. The fourth fabric was formed with body yarns having a 55/25/20 modacrylic/nylon/lyocell fiber blend and represents an embodiment of a fabric made pursuant to the present invention.
  • The fabrics were woven both without reinforcing yarns (i.e., the fabrics only included body yarns) and with identical reinforcing yarns. The break or tensile strength of the body yarns and reinforcing yarns was measured (pursuant to ASTM D5034 (Standard Test Method for Breaking Strength and Elongation of Textile Fabrics (Grab Test) (2013 edition)), and the results were reported in pounds force. Moreover, the tear strength of the fabrics in the fill direction, both with and without reinforcing yarns, was also measured (pursuant to ASTM D1424). The results are graphically represented in Graph 1.
  • TABLE 4
    Non-
    Body Reinforcing Reinforced Reinforced % Filling
    Yarn Yarn Fabric Fabric Tear Strength
    Breaking Breaking Filling Tear Filling Tear Increase with
    Strength Strength Strength Strength Reinforcement
    Body Yarn/Fabric Fiber Blend (lbf) (lbf) (lbf) (lbf) Yarns
    65/25/10 FR rayon/para-aramid/nylon 1.9 2.2 9.4 10.9 16.0
    93/5/2 meta-aramid/para-aramid/anti-static 1.8 2.2 12.8 12.2 −4.7
    48/37/15 modacrylic/lyocell/para-aramid 1.33 2.2 11.9 17.5 47.1
    55/25/20 modacrylic/nylon/lyocell 1.15 2.2 9.3 14.6 57.0

  • The data demonstrates that the reinforcing yarns were significantly more effective when included in a fabric having weaker body yarns. For example, the first fabric has body yarns that are significantly stronger than those of the fourth fabric. Not surprising, inclusion of the same reinforcing yarns in each of these fabrics increased the overall tear strength of each fabric. However, what is surprising is the efficacy of such reinforcing yarns in fabrics made from weaker yarns. Inclusion of the reinforcing yarns in the fabric with the strongest body yarns (the first fabric) only resulted in a 16% improvement in fabric tear strength. However, inclusion of the same reinforcing yarns in the fabric with the weakest body yarns (the fourth fabric) led to a 57% increase in fabric tear strength. Not only that, the tear strength of the reinforced fabric formed with the weaker yarns actually surpassed the tear strength of the reinforced fabric formed with the strongest yarns.
  • Embodiments of the fabrics disclosed herein are printable and/or dyeable with vat dyes so as to comply with at least one of the following:
      • GL-PD-07-12, sections 3.6.1.1, 3.6.3 (Table I), and 3.8.1;
      • GL-PD-07-12, sections 3.6.1.2, 3.6.3 (Table I.A), and 3.8.2;
      • GL-PD-07-12, sections 3.6.1.3, 3.6.3 (Table I.B), and 3.8.3;
      • MIL-PRF-EFRCE, sections 3.3.2.1, 3.3.5 (Table I), and 3.3.7.1;
      • MIL-PRF-EFRCE, sections 3.3.2.2, 3.3.5 (Table I), and 3.3.7.2;
      • MIL-PRF-EFRCE, sections 3.3.2.3, 3.3.5 (Table I), and 3.3.7.3;
      • MIL-PRF-EFRCE, sections 3.3.2.4, 3.3.5 (Table I), and 3.3.7.3; and
      • MIL-PRF-EFRCE, sections 3.3.2.5, 3.3.5 (Table II), and 3.3.7.4.
  • By way only of example, High Strength Modacrylic Blend Twill fabric was vat dye printed with the Class 3, Operational Camouflage Pattern (OCP) pattern specified in GL-PD-07-12, section 3.6.1.3. The colorfastness and near IR reflectance of the fabric was tested and compared against the applicable GL-PD-07-12 requirements for the OCP pattern. Table 5 compares the colorfastness of the High Strength Modacrylic Blend Twill fabric with the OCP pattern against the colorfastness requirements for that pattern (GL-PD-07-12, section 3.6.3 and Table I.B). Table 6 compares the spectral or near IR reflectance of the High Strength Modacrylic Blend Twill fabric with the OCP pattern against the spectral reflectance requirements for that pattern (GL-PD-07-12, section 3.8.3 and Table II.B). The High Strength Modacrylic Blend Twill fabric with the OCP pattern passed all of the applicable colorfastness and near IR reflectance requirements for that pattern.
  • TABLE 5
    (Colorfastness)
    GL-PD-07-12
    Purchase
    Description,
    Class 3
    High Operational
    Strength Camouflage
    Modacrylic Pattern (OCP),
    Blend Section 3.6, Test
    Colorfastness to: Twill Table I.B Method
    Pattern OCP OCP
    Light
    40 hrs (rating) AATCC 16
    Dark Cream 599 3 3 (min)
    Tan 525 3 3 (min)
    Light Sage 560 3 3 (min)
    Olive 527 3-4 3 (min)
    Dark Green 528 3-4 3-4 (min)
    Brown 529 3-4 3-4 (min)
    Bark Brown 561 4 3-4 (min)
    Crocking
    Dry (rating)
    Dark Cream 599 5 4 (min) AATCC 8
    Tan 525 5 4 (min)
    Light Sage 560 5 4 (min)
    Olive 527 5 4 (min)
    Dark Green 528 5 3 (min)
    Brown 529 4.5 3 (min)
    Bark Brown 561 4.5 3 (min)
    Wet (rating)
    Dark Cream 599 4.5 3.5 (min)
    Tan 525 4.5 3.5 (min)
    Light Sage 560 4.5 3.5 (min)
    Olive 527 4 3.5 (min)
    Dark Green 528 4 2 (min)
    Brown 529 3 2 (min)
    Bark Brown 561 2 2 (min)
    Laundering
    Shade Change (rating) AATCC 61
    3A, 1×
    Dark Cream 599 4-5 3 (min)
    Tan 525 4-5 3 (min)
    Light Sage 560 4-5 3 (min)
    Olive 527 4-5 3 (min)
    Dark Green 528 5 2-3 (min)
    Brown 529 4-5 2-3 (min)
    Bark Brown 561 4-5 2-3 (min)
    Staining - Cotton (rating)
    Dark Cream 599 5 3 (min)
    Tan 525 5 3 (min)
    Light Sage 560 4-5 3 (min)
    Olive 527 5 3 (min)
    Dark Green 528 5 2-3 (min)
    Brown 529 4-5 2-3 (min)
    Bark Brown 561 4-5 2-3 (min)
    Staining - Nylon (rating)
    Dark Cream 599 4 3 (min)
    Tan 525 4 3 (min)
    Light Sage 560 3-4 3 (min)
    Olive 527 4-5 3 (min)
    Dark Green 528 5 2-3 (min)
    Brown 529 3-4 2-3 (min)
    Bark Brown 561 3-4 2-3 (min)
    Staining - Overall (rating)
    Dark Cream 599 4-5 3 (min)
    Tan 525 4-5 3 (min)
    Light Sage 560 4 3 (min)
    Olive 527 4-5 3 (min)
    Dark Green 528 4-5 2-3 (min)
    Brown 529 4 2-3 (min)
    Bark Brown 561 4-5 2-3 (min)
    Perspiration
    Color Change (rating) AATCC 15
    Dark Cream 599 5 3-4 (min)
    Tan 525 5 3-4 (min)
    Light Sage 560 5 3-4 (min)
    Olive 527 5 3-4 (min)
    Dark Green 528 5 3-4 (min)
    Brown 529 5 3-4 (min)
    Bark Brown 561 5 3-4 (min)
    Staining (rating)
    Dark Cream 599 5 3-4 (min)
    Tan 525 5 3-4 (min)
    Light Sage 560 5 3-4 (min)
    Olive 527 5 3-4 (min)
    Dark Green 528 5 3-4 (min)
    Brown 529 5 3-4 (min)
    Bark Brown 561 5 3-4 (min)
  • TABLE 6
    (Spectral/IR Reflectance)
    (3) Light Sage 560
    (1) Dark Cream 559 (4) Olive 527 (6) Dark Green 528
    Wavelength (2) Tan 525 (5) Brown 529 (7) Bark Brown 561
    (nm) MIN Actual MAX MIN Actual MAX MIN Actual MAX
    600 22 (1) 38; (2) 31 44 12 (3) 25; (4) 23; (5) 15 30 3 (6) 13; (7) 8  11
    620 24 (1) 39; (2) 32 45 12 (3) 25; (4) 24; (5) 16 30 3 (6) 12; (7) 9  12
    640 24 (1) 42; (2) 36 45 12 (3) 26; (4) 25; (5) 18 32 4 (6) 13; (7) 9  13
    660 25 (1) 45; (2) 40 45 12 (3) 28; (4) 26; (5) 19 32 4 (6) 13; (7) 11 14
    680 28 (1) 47; (2) 43 45 14 (3) 29; (4) 27; (5) 20 34 4 (6) 14; (7) 14 17
    700 28 (1) 48; (2) 44 48 14 (3) 30; (4) 28; (5) 22 36 6 (6) 15; (7) 17 23
    720 30 (1) 50; (2) 46 52 16 (3) 30; (4) 30; (5) 25 39 6 (6) 18; (7) 20 23
    740 32 (1) 51; (2) 47 55 18 (3) 31; (4) 31; (5) 28 41 10 (6) 21; (7) 22 25
    760 36 (1) 53; (2) 49 56 20 (3) 33; (4) 32; (5) 32 43 14 (6) 25; (7) 25 30
    780 38 (1) 54; (2) 51 57 22 (3) 34; (4) 34; (5) 34 45 18 (6) 28; (7) 27 35
    800 40 (1) 56; (2) 53 57 22 (3) 36; (4) 36; (5) 37 45 21 (6) 31; (7) 28 40
    820 44 (1) 57; (2) 54 58 24 (3) 38; (4) 38; (5) 38 46 24 (6) 33; (7) 30 42
    840 46 (1) 60; (2) 58 59 26 (3) 41; (4) 40; (5) 41 47 26 (6) 35; (7) 32 43
    860 48 (1) 62; (2) 60 60 28 (3) 43; (4) 43; (5) 44 48 28 (6) 38; (7) 35 45
  • Fabrics according to some embodiments of the invention are self-extinguishing, exhibit no melt or drip when exposed to a flame or thermal event, and/or have an afterflame of less than or equal to two seconds when tested in accordance with ASTM D6413. While the char lengths of the tested fabrics failed to comply with the requirements of GL-PD-07-12 and MIL-PRF-EFRCE, fabrics according to some embodiments of the invention have a char length of 6 inches or less and of 7 inches or less, when tested pursuant to ASTM D6413.
  • As evident in Table 3, some embodiments fully comply with the requirements of ASTM F 1506, including exhibiting a char length of 6 inches or less when tested in accordance with ASTM D6413. It is expected that increasing the weight of the fabrics tested would increase the likelihood the fabric complying fully with the requirements of ASTM F 1506.
  • Embodiments of the flame resistant fabrics disclosed herein can be used to construct the entirety of, or various portions of, a variety of protective garments for use in military applications and/or electrical applications, including, but not limited to, combat uniforms, coveralls, jumpsuits, shirts, jackets, vests, and trousers. Low weight versions (e.g., 6 osy or less) of fabrics disclosed herein may be particularly suitable for inclusion in uniforms for use in hot and hot/humid environments, such as deserts, jungles, and other tropical environments.
  • Different arrangements of the components described above, as well as components and steps not shown or described are possible. Similarly, some features and subcombinations are useful and may be employed without reference to other features and subcombinations. Embodiments of the invention have been described for illustrative and not restrictive purposes, and alternative embodiments will become apparent to readers of this patent. Accordingly, the present invention is not limited to the embodiments described above or depicted in the drawings, and various embodiments and modifications can be made without departing from the scope of the invention.

Claims (54)

We claim:
1. A flame resistant fabric comprising spun yarns comprising a fiber blend comprising a plurality of modacrylic fibers, a plurality of cellulosic fibers, and a plurality of nylon fibers, wherein the fiber blend is devoid of aramid fibers and wherein the fabric (i) has a two second or less afterflame measured pursuant to ASTM D6413 and (ii) is printable with vat dyes such that the fabric will comply with the requirements set forth in at least one of section 3.8.1, section 3.8.2, and section 3.8.3 of GL-PD-07-12.
2. The flame resistant fabric of claim 1, wherein the fabric comprise a weight of 4-10 ounces per square yard, inclusive.
3. The flame resistant fabric of claim 1, wherein the fabric further comprises a plurality of stretch broken yarns or filament yarns.
4. The flame resistant fabric of claim 3, wherein the plurality of stretch broken yarns or filament yarns are provided in both a warp direction and a fill direction of the fabric so as to form a grid pattern within the fabric.
5. The flame resistant fabric of claim 3, wherein the plurality of stretch broken yarns or filament yarns comprise nylon filament yarns.
6. The flame resistant fabric of claim 3, wherein the fabric comprises a weight less than or equal to 6 ounces per square yard.
7. The flame resistant fabric of claim 6, wherein the fabric comprises a tear strength of at least 14 pounds force in at least one of a warp direction and a fill direction of the fabric when tested pursuant to ASTM D1424.
8. The flame resistant fabric of claim 7, wherein the fabric comprises a tear strength of at least 16 pounds force in at least one of a warp direction and a fill direction of the fabric when tested pursuant to ASTM D1424.
9. The flame resistant fabric of claim 8, wherein the fabric comprises a tear strength of at least 19 pounds force in at least one of a warp direction and a fill direction of the fabric when tested pursuant to ASTM D1424.
10. The flame resistant fabric of claim 9, wherein the fabric comprises a tear strength of at least 21 pounds force in at least one of a warp direction and a fill direction of the fabric when tested pursuant to ASTM D1424.
11. The flame resistant fabric of claim 3, wherein the fabric comprises a weight of 4-10 ounces per square yard, inclusive, and wherein the plurality of stretch broken yarns or filament yarns comprises a weight that is 5-40% of the fabric weight.
12. The flame resistant fabric of claim 1, wherein the fabric has a char length of six inches or less when measured pursuant to ASTM D6413.
13. A flame resistant fabric comprising spun yarns comprising a fiber blend comprising a plurality of modacrylic fibers, a plurality of cellulosic fibers, and a plurality of aliphatic polyamide fibers, wherein the fiber blend is devoid of aramid fibers and wherein the fabric is printable or dyeable with vat dyes so as to comply with at least one of: GL-PD-07-12, sections 3.6.1.1, 3.6.3 (Table I), and 3.8.1; GL-PD-07-12, sections 3.6.1.2, 3.6.3 (Table I.A), and 3.8.2; GL-PD-07-12, sections 3.6.1.3, 3.6.3 (Table I.B), and 3.8.3; MIL-PRF-EFRCE, sections 3.3.2.1, 3.3.5 (Table I), and 3.3.7.1; MIL-PRF-EFRCE, sections 3.3.2.2, 3.3.5 (Table I), and 3.3.7.2; MIL-PRF-EFRCE, sections 3.3.2.3, 3.3.5 (Table I), and 3.3.7.3; MIL-PRF-EFRCE, sections 3.3.2.4, 3.3.5 (Table I), and 3.3.7.3; and MIL-PRF-EFRCE, sections 3.3.2.5, 3.3.5 (Table II), and 3.3.7.4.
14. The flame resistant fabric of claim 13, wherein the fabric further comprises a plurality of stretch broken yarns or filament yarns.
15. The flame resistant fabric of claim 14, wherein the plurality of stretch broken yarns or filament yarns are provided in both a warp direction and a fill direction of the fabric so as to form a grid pattern within the fabric.
16. The flame resistant fabric of claim 14, wherein the plurality of stretch broken yarns or filament yarns comprise nylon filament yarns.
17. The flame resistant fabric of claim 13, wherein the fabric comprises a weight less than or equal to 6 ounces per square yard.
18. The flame resistant fabric of claim 13, where the plurality of modacrylic fibers comprises a first percentage of the fiber blend, the plurality of cellulosic fibers comprises a second percentage of the fiber blend, and the plurality of aliphatic polyamide fibers comprises a third percentage of the fiber blend, wherein the first percentage is greater than each of the second percentage and the third percentage.
19. The flame resistant fabric of claim 18, wherein the first percentage is greater than a sum of the second percentage and the third percentage.
20. The flame resistant fabric of claim 18, wherein the third percentage is greater than the second percentage.
21. The flame resistant fabric of claim 13, wherein the fabric has a char length of seven inches or less and a two second or less afterflame when measured pursuant to ASTM D6413.
22. The flame resistant fabric of claim 13, wherein the fiber blend comprises approximately 30-80% modacrylic fibers, approximately 10-60% cellulosic fibers, and approximately 5-50% aliphatic polyamide fibers.
23. The flame resistant fabric of claim 22, wherein the fiber blend comprises approximately 35-70% modacrylic fibers, approximately 10-50% cellulosic fibers, and approximately 10-40% aliphatic polyamide fibers.
24. The flame resistant fabric of claim 23, wherein the fiber blend comprises approximately 40-65% modacrylic fibers, approximately 10-40% cellulosic fibers, and approximately 15-40% aliphatic polyamide fibers.
25. A flame resistant fabric comprising:
a. spun yarns comprising a fiber blend comprising a plurality of modacrylic fibers, a plurality of cellulosic fibers, and a plurality of aliphatic polyamide fibers; and
b. a plurality of stretch broken yarns or filament yarns provided in at least one of a warp direction and a fill direction of the fabric, wherein the fabric is printable or dyeable with vat dyes so as to comply with at least one of: GL-PD-07-12, sections 3.6.1.1, 3.6.3 (Table I), and 3.8.1; GL-PD-07-12, sections 3.6.1.2, 3.6.3 (Table I.A), and 3.8.2; GL-PD-07-12, sections 3.6.1.3, 3.6.3 (Table I.B), and 3.8.3; MIL-PRF-EFRCE, sections 3.3.2.1, 3.3.5 (Table I), and 3.3.7.1; MIL-PRF-EFRCE, sections 3.3.2.2, 3.3.5 (Table I), and 3.3.7.2; MIL-PRF-EFRCE, sections 3.3.2.3, 3.3.5 (Table I), and 3.3.7.3; MIL-PRF-EFRCE, sections 3.3.2.4, 3.3.5 (Table I), and 3.3.7.3; and MIL-PRF-EFRCE, sections 3.3.2.5, 3.3.5 (Table II), and 3.3.7.4.
26. The flame resistant fabric of claim 25, wherein the plurality of stretch broken yarns or filament yarns are provided in both the warp direction and the fill direction of the fabric so as to form a grid pattern within the fabric.
27. The flame resistant fabric of claim 25, wherein the plurality of stretch broken yarns or filament yarns comprise nylon filament yarns.
28. The flame resistant fabric of claim 25, wherein the fabric comprises a weight less than or equal to 6 ounces per square yard.
29. The flame resistant fabric of claim 28, wherein the fabric comprises a tear strength of at least 14 pounds force in at least one of the warp direction and the fill direction of the fabric when tested pursuant to ASTM D1424.
30. The flame resistant fabric of claim 29, wherein the fabric comprises a tear strength of at least 16 pounds force in at least one of the warp direction and the fill direction of the fabric when tested pursuant to ASTM D1424.
31. The flame resistant fabric of claim 30, wherein the fabric comprises a tear strength of at least 19 pounds force in at least one of the warp direction and the fill direction of the fabric when tested pursuant to ASTM D1424.
32. The flame resistant fabric of claim 31, wherein the fabric comprises a tear strength of at least 21 pounds force in at least one of the warp direction and the fill direction of the fabric when tested pursuant to ASTM D1424.
33. The flame resistant fabric of claim 25, wherein the fabric has a char length of seven inches or less and a two second or less afterflame when measured pursuant to ASTM D6413.
34. The flame resistant fabric of claim 25, wherein the fiber blend is devoid of aramid fibers.
35. A flame resistant fabric comprising:
a. spun yarns comprising a fiber blend comprising a plurality of modacrylic fibers, a plurality of cellulosic fibers, and a plurality of aliphatic polyamide fibers; and
b. a plurality of stretch broken yarns or filament yarns provided in at least one of a warp direction and a fill direction of the fabric,
wherein the fabric has a weight of less than or equal to six ounces per square yards and a tear strength of at least 14 pounds force in at least one of the warp direction and the fill direction of the fabric when measured pursuant to ASTM D1424.
36. The flame resistant fabric of claim 35, wherein the plurality of stretch broken yarns or filament yarns are provided in both the warp direction and the fill direction of the fabric so as to form a grid pattern within the fabric.
37. The flame resistant fabric of claim 35, wherein the fabric comprises a tear strength of at least 16 pounds force in at least one of the warp direction and the fill direction of the fabric when tested pursuant to ASTM D1424.
38. The flame resistant fabric of claim 37, wherein the fabric comprises a tear strength of at least 19 pounds force in at least one of the warp direction and the fill direction of the fabric when tested pursuant to ASTM D1424.
39. The flame resistant fabric of claim 38, wherein the fabric comprises a tear strength of at least 21 pounds force in at least one of the warp direction and the fill direction of the fabric when tested pursuant to ASTM D1424.
40. The flame resistant fabric of claim 35, wherein the fabric has a char length of seven inches or less and a two second or less afterflame when measured pursuant to ASTM D6413.
41. The flame resistant fabric of claim 35, wherein the fiber blend is devoid of aramid fibers.
42. A flame resistant fabric comprising:
a. spun yarns comprising a fiber blend comprising a plurality of modacrylic fibers, a plurality of cellulosic fibers, and a plurality of aliphatic polyamide fibers; and
b. a plurality of stretch broken yarns or filament yarns provided in at least one of a warp direction and a fill direction of the fabric,
wherein the fabric complies with ASTM F 1506.
43. The flame resistant fabric of claim 42, wherein the plurality of stretch broken yarns or filament yarns are provided in both a warp direction and a fill direction of the fabric so as to form a grid pattern within the fabric.
44. The flame resistant fabric of claim 42, wherein the fabric comprises a weight less than or equal to 6 ounces per square yard.
45. The flame resistant fabric of claim 44, wherein the fabric comprises a tear strength of at least 14 pounds force in at least one of the warp direction and the fill direction of the fabric when tested pursuant to ASTM D1424.
46. The flame resistant fabric of claim 42, wherein the fiber blend comprises approximately 30-80% modacrylic fibers, approximately 10-60% cellulosic fibers, and approximately 5-50% aliphatic polyamide fibers.
47. The flame resistant fabric of claim 42, wherein the fiber blend is devoid of aramid fibers.
48. A flame resistant fabric comprising spun yarns comprising a fiber blend comprising a plurality of modacrylic fibers, a plurality of cellulosic fibers, and a plurality of aliphatic polyamide fibers, wherein the fiber blend is devoid of aramid fibers and wherein the fabric is printed or dyed with vat dyes to impart on the fabric a camouflage pattern specified in GL-PD-07-12 or MIL-PRF-EFRCE.
49. The flame resistant fabric of claim 48, wherein the fabric complies with the infrared requirements specified in GL-PD-07-12 or MIL-PRF-EFRCE for the camouflage pattern.
50. The flame resistant fabric of claim 48, wherein the fabric further comprises a plurality of stretch broken yarns or filament yarns.
51. The flame resistant fabric of claim 50, wherein the plurality of stretch broken yarns or filament yarns are provided in both a warp direction and a fill direction of the fabric so as to form a grid pattern within the fabric.
52. The flame resistant fabric of claim 50, wherein the plurality of stretch broken yarns or filament yarns comprise nylon filament yarns.
53. The flame resistant fabric of claim 50, wherein the fabric comprises a weight less than or equal to 6 ounces per square yard.
54. The flame resistant fabric of claim 53, wherein the fabric comprises a tear strength of at least 14 pounds force in at least one of the warp direction and the fill direction of the fabric when tested pursuant to ASTM D1424.
US15/768,142 2015-10-21 2016-10-21 Lightweight, Printable Flame Resistant Fabrics Suitable for Protective Clothing Worn in Hot and/or Humid Environments Abandoned US20180313006A1 (en)

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PL3365482T3 (en) 2022-05-16
CA3001704A1 (en) 2017-04-27
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WO2017070529A1 (en) 2017-04-27
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EP3365482A4 (en) 2019-05-08
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HUE058260T2 (en) 2022-07-28
EP3365482B1 (en) 2021-12-01

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