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US3842628A - Industrial tapes - Google Patents

Industrial tapes Download PDF

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Publication number
US3842628A
US3842628A US00295337A US29533772A US3842628A US 3842628 A US3842628 A US 3842628A US 00295337 A US00295337 A US 00295337A US 29533772 A US29533772 A US 29533772A US 3842628 A US3842628 A US 3842628A
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United States
Prior art keywords
knitted
warp
tape
carbon filament
filament tow
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Expired - Lifetime
Application number
US00295337A
Inventor
J Bennett
A Parva
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Specialized Tapes Ltd
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Specialized Tapes Ltd
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Publication date
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Application granted granted Critical
Publication of US3842628A publication Critical patent/US3842628A/en
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    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04B—KNITTING
    • D04B21/00—Warp knitting processes for the production of fabrics or articles not dependent on the use of particular machines; Fabrics or articles defined by such processes
    • D04B21/14—Fabrics characterised by the incorporation by knitting, in one or more thread, fleece, or fabric layers, of reinforcing, binding, or decorative threads; Fabrics incorporating small auxiliary elements, e.g. for decorative purposes
    • D04B21/16—Fabrics characterised by the incorporation by knitting, in one or more thread, fleece, or fabric layers, of reinforcing, binding, or decorative threads; Fabrics incorporating small auxiliary elements, e.g. for decorative purposes incorporating synthetic threads
    • 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
    • D10B2403/00—Details of fabric structure established in the fabric forming process
    • D10B2403/02—Cross-sectional features
    • D10B2403/024—Fabric incorporating additional compounds
    • D10B2403/0241—Fabric incorporating additional compounds enhancing mechanical properties
    • D10B2403/02411—Fabric incorporating additional compounds enhancing mechanical properties with a single array of unbent yarn, e.g. unidirectional reinforcement fabrics
    • 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
    • D10B2403/00—Details of fabric structure established in the fabric forming process
    • D10B2403/03—Shape features
    • D10B2403/031—Narrow fabric of constant width
    • 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
    • D10B2505/00—Industrial
    • D10B2505/02—Reinforcing materials; Prepregs

Definitions

  • An industrial tape for reinforcing materials such as laminates and mouldings, comprises a knitted woven or non-woven ground fabric on which a carbon filament tow is held by overlying holding threads. 1n the case of a knitted ground fabric the overlying holding threads are preferably knitted loops.
  • the invention relates to industrial tapes for the stiffening and reinforcement of materials, in particular plastics, wood and/or metal laminates and matrix materials such as plastics mouldings, and to a method of producing such tapes.
  • Carbon filaments are a valuable reinforcing material for the manufacture of, for example, reinforced plastics mouldings, and such mouldings comprising carbon filaments in a plastics matrix have a very desirable stiffness to weight ratio.
  • the carbon filaments are preferably laid in the form of a tow which may contain about 10,000 individual filaments and one difficulty in the manufacture of such reinforced mouldings, lies in the handling of the tow.
  • the invention provides an industrial tape comprising a ground fabric on which is supported at least one carbon filament tow held to the fabric by an overlying holding thread.
  • the tape is knitted, with the overlying holding thread forming part of the knitted construction.
  • An alternative construction is a woven or non-woven ground fabric on which a carbon filament tow is held by overlying stitches.
  • the ground fabric is preferably made from glass fibre threads, which have physical properties suitable for use themselves as reinforcements in matrix materials.
  • the overlying holding thread is preferably also a glass fibre thread.
  • a number of carbon filament tows may be arranged longitudinally along the tape, each retained by an overlying holding thread. Each carbon filament tow may comprise a single carbon fibre bundle or may be built up from a number of such bundles.
  • each carbon filament tow preferably stands proud of the plane of the rest of the tape for as great a height as possible. Flattening of a tow by the overlying holding thread can be prevented by reducing the tension of the holding thread, or, in the case of a knitted construction, by increasing the tension of the threads of the knitted ground fabric.
  • the carbon filament tow is preferably substantially flush or nearly as flush as possible with the rest of the tape.
  • the carbon filament tow may extend axially along the tape or diagonally across the tape in zig-zag formation.
  • the latter provides a reinforcement against torsional stress as well as against longitudinal flexure.
  • Tapes having at least two carbon filament tows one or more of which extends axially along the tape and one or more of which extends diagonally across the tape provide reinforcement against longitudinal as well as torsional flexure and are particularly suitable for the reinforcement of moulded snow skis.
  • Tapes according to the invention can be knitted on warp knitting machines equipped with warp inlay bars, preferably at least three.
  • a suitable machine would be a single bed raschel knitting machine.
  • the tapes may have a thickness of two or more needles, preferably six needles.
  • a second warp inlay bar inserts the carbon filament tow down the ground structure between adjacent needles. If the second warp inlay bar lays in the carbon filament tow without shogging the tow is arranged axially along the tape. If the second warp inlay bar shogs from side to side the tow is arranged diagonally across the tape in zig-zag configuration.
  • a third warp inlay bar shogs reciprocally ever two or more needle spacings to lay the holding thread between the needles on each side of the carbon filament tow.
  • the tension of the backing thread below the carbon filament tow should be increased or that of the holding thread above the carbon filament tow reduced if it is desired that the carbon filament tow should stand proud of the rest of the tape.
  • the holding thread may be laid in at a negligible tension so that it forms an upstanding loop around the carbon filament tow and does not flatten the tow.
  • an analogous procedure is used, optionally using more than one holding thread.
  • the knitted structure may if desired incorporate a ladderresist thread formation.
  • FIG. 1 is a loop diagram of a tape according to this invention.
  • FIGS. 2A to 2D are diagrams showing warp chains and the movements of the three warp inlay bars of a single bed raschel knitting machine that would produce the tape of FIG. 1. Only the two needles one on each side of the carbon filament tow are shown in FIGS. 2A to 2D.
  • FIG. 3 shows the loop diagram of a tape of the invention having a zig-zag carbon tow.
  • FIGS. 3A to 3C are diagrams showing the movement of the three warp inlay bars of a single raschel knitting machine that would produce the tape of FIG. 3.
  • Warp chains shown in FIG. 2A are formed.
  • a chain of loops of glass fibre thread 1 is knitted on each needle, and five glass fibre ground threads 2 are laid around adjacent needles on successive courses (FIG. 2B).
  • the five ground threads 2 are laid by a single warp inlay bar which carries five warp inlay tubes at single needle spacings.
  • a carbon filament tow 3 is inserted from a second warp inlay bar with no bar sideways movement (FIG. 2C).
  • the warp inlay tube feeding the carbon filament tow preferably has a flared inlet to assist insertion of the tow and prevent shredding.
  • a glass fibre holding thread 4 is simultaneously laid from a third warp inlay bar around the needles on each side of the tow 3, shogging the third warp inlay bar through two needle spaces in alternative directions every other course (FIG. 2D).
  • the tension of the holding thead 4 is reduced to a minimum so that it does not flatten the tow 3 but forms an upstanding loop around the tow.
  • the resulting tape is relatively easy to handle, especially when used in the reinforcement of fairly large mouldings such as car bodies and boat hulls.
  • a warp knitted industrial reinforcement tape having a knitted structure comprising:

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Knitting Of Fabric (AREA)
  • Laminated Bodies (AREA)
  • Reinforced Plastic Materials (AREA)

Abstract

An industrial tape for reinforcing materials such as laminates and mouldings, comprises a knitted woven or non-woven ground fabric on which a carbon filament tow is held by overlying holding threads. In the case of a knitted ground fabric the overlying holding threads are preferably knitted loops.

Description

man States Patent [191 Bennett et a1.
INDUSTRIAL TAPES Inventors: James Bennett; Ashby Parva, both of Nr. Rugby, England Assignee: Specialized Tapes Limited,
Hinckley, England Filed: Oct. 5, 1972 Appl. No.: 295,337
[30] Foreign Application Priority Data Oct. 28, 1971 Great Britain 50407/71 US. Cl. 66/193, 66/202 Int. Cl D04b 21/14 Field of Search 66/ 190-195, 66/202; 139/420 R, 420 C, 425; 57/140 R,
[56] References Cited UNITED STATES PATENTS 2,800,783 7/1957 Abood 66/192 Primary Examinerlames Kee Chi Attorney, Agent, or Firm-Burgess, Dinklage & Sprung 57 ABSTRACT An industrial tape for reinforcing materials such as laminates and mouldings, comprises a knitted woven or non-woven ground fabric on which a carbon filament tow is held by overlying holding threads. 1n the case of a knitted ground fabric the overlying holding threads are preferably knitted loops.
7 Claims, 9 Drawing Figures u i were k r n n PAIEmnnm 3.842.828
- smuuF-a WA RP I FIG. FIG. FIG. FIG.
2A 28" 2c 20 Y INDUSTRIAL TAPES The invention relates to industrial tapes for the stiffening and reinforcement of materials, in particular plastics, wood and/or metal laminates and matrix materials such as plastics mouldings, and to a method of producing such tapes.
Carbon filaments are a valuable reinforcing material for the manufacture of, for example, reinforced plastics mouldings, and such mouldings comprising carbon filaments in a plastics matrix have a very desirable stiffness to weight ratio. The carbon filaments are preferably laid in the form of a tow which may contain about 10,000 individual filaments and one difficulty in the manufacture of such reinforced mouldings, lies in the handling of the tow.
The invention provides an industrial tape comprising a ground fabric on which is supported at least one carbon filament tow held to the fabric by an overlying holding thread. Preferably the tape is knitted, with the overlying holding thread forming part of the knitted construction. An alternative construction is a woven or non-woven ground fabric on which a carbon filament tow is held by overlying stitches. The ground fabric is preferably made from glass fibre threads, which have physical properties suitable for use themselves as reinforcements in matrix materials. The overlying holding thread is preferably also a glass fibre thread. A number of carbon filament tows may be arranged longitudinally along the tape, each retained by an overlying holding thread. Each carbon filament tow may comprise a single carbon fibre bundle or may be built up from a number of such bundles. For certain applications, for example the reinforcement of fairly large panels such as car bodies and boat hulls, each carbon filament tow preferably stands proud of the plane of the rest of the tape for as great a height as possible. Flattening of a tow by the overlying holding thread can be prevented by reducing the tension of the holding thread, or, in the case of a knitted construction, by increasing the tension of the threads of the knitted ground fabric. For other applications, for example the reinforcement of laminated structures in which the tape is held in a plastics matrix between two sheets that are bonded together by the matrix, the carbon filament tow is preferably substantially flush or nearly as flush as possible with the rest of the tape.
The carbon filament tow may extend axially along the tape or diagonally across the tape in zig-zag formation. The latter provides a reinforcement against torsional stress as well as against longitudinal flexure. Tapes having at least two carbon filament tows one or more of which extends axially along the tape and one or more of which extends diagonally across the tape provide reinforcement against longitudinal as well as torsional flexure and are particularly suitable for the reinforcement of moulded snow skis.
Tapes according to the invention can be knitted on warp knitting machines equipped with warp inlay bars, preferably at least three. A suitable machine would be a single bed raschel knitting machine. The tapes may have a thickness of two or more needles, preferably six needles.
The preferred method of knitting a tape according to the invention with a single carbon filament tow is as follows: each warp needle knits a chain of loops, and a first warp inlay bar shogs reciprocally over two or more needle spacings to lay one or more backing threads to form a ground structure. A second warp inlay bar inserts the carbon filament tow down the ground structure between adjacent needles. If the second warp inlay bar lays in the carbon filament tow without shogging the tow is arranged axially along the tape. If the second warp inlay bar shogs from side to side the tow is arranged diagonally across the tape in zig-zag configuration. A third warp inlay bar shogs reciprocally ever two or more needle spacings to lay the holding thread between the needles on each side of the carbon filament tow. The tension of the backing thread below the carbon filament tow should be increased or that of the holding thread above the carbon filament tow reduced if it is desired that the carbon filament tow should stand proud of the rest of the tape. For example, the holding thread may be laid in at a negligible tension so that it forms an upstanding loop around the carbon filament tow and does not flatten the tow. To knit a tape with more than one carbon filament tow an analogous procedure is used, optionally using more than one holding thread. The knitted structure may if desired incorporate a ladderresist thread formation.
The invention is illustrated by the drawings, of which:
FIG. 1 is a loop diagram of a tape according to this invention; and
FIGS. 2A to 2D are diagrams showing warp chains and the movements of the three warp inlay bars of a single bed raschel knitting machine that would produce the tape of FIG. 1. Only the two needles one on each side of the carbon filament tow are shown in FIGS. 2A to 2D.
FIG. 3 shows the loop diagram of a tape of the invention having a zig-zag carbon tow.
FIGS. 3A to 3C are diagrams showing the movement of the three warp inlay bars of a single raschel knitting machine that would produce the tape of FIG. 3.
Six needles are used to knit the tape. Warp chains shown in FIG. 2A are formed. A chain of loops of glass fibre thread 1 is knitted on each needle, and five glass fibre ground threads 2 are laid around adjacent needles on successive courses (FIG. 2B). The five ground threads 2 are laid by a single warp inlay bar which carries five warp inlay tubes at single needle spacings. A carbon filament tow 3 is inserted from a second warp inlay bar with no bar sideways movement (FIG. 2C). The warp inlay tube feeding the carbon filament tow preferably has a flared inlet to assist insertion of the tow and prevent shredding. A glass fibre holding thread 4 is simultaneously laid from a third warp inlay bar around the needles on each side of the tow 3, shogging the third warp inlay bar through two needle spaces in alternative directions every other course (FIG. 2D). The tension of the holding thead 4 is reduced to a minimum so that it does not flatten the tow 3 but forms an upstanding loop around the tow.
The resulting tape is relatively easy to handle, especially when used in the reinforcement of fairly large mouldings such as car bodies and boat hulls.
I claim:
1. A warp knitted industrial reinforcement tape having a knitted structure comprising:
a. chains of warp-knitted stitches formed of warp threads;
b. at least one backing thread laid into the knitted structure beneath the chains of warp-knitted stitches;
c. at least one carbon filament tow laid into the knitted structure over the chains of warp-knitted stitches; and
d. at least one holding thread laid into the knitted structure over the chains of warp knitted stitches and the carbon filament tow to hold the tow in the ta e.
2. A warp-knitted industrial reinforcement tape according to claim 1, wherein the threads forming chains of warp-knitted stitches, the backing threads and the holding threads are all glass fiber threads.
3. A warp-knitted industrial reinforcement tape according to claim 1, wherein at least one backing thread is at higher tension than the at least one holding thread so that the carbon filament tow stands proud of the plane of the rest of the tape.
4. A warp-knitted industrial reinforcement tape according to claim 1, wherein the backing and holding threads are at substantially the same low tension so that the carbon filament tow lies substantially flush with the rest of the tape.
5. A warp knitted industrial reinforcement tape according to claim 1, wherein the carbon filament tow extends axially along the tape.
6. A warp-knitted industrial reinforcement tape according to claim 1, wherein the carbon filament tow extends diagonally across the tape in a zig-zag configuration.
7. A warp-knitted industrial reinforcement tape according to claim 1, wherein at least two carbon filament tows are held in the tape by the at least one holding thread, one carbon filament tow extending axially along the tape and the other carbon filament tow extending diagonally across the tape in a zig-zag configuration.
" 1:53; UNITED sums IA'USN'LLUI'I'ILE. I CERTIFICATE OF? CORRECTION I Patent No. 4 ,628
Dated October 22, 1974 InventorGO James Bennett It is certified that error appears" in the above-identified patent and that said Letters Patent are hereby corrected as shown below:
For. Inventors:
"James" Bennett; Ashby'Parva, b'oth'of Nr. Rugby, England" should read "James Bennett of Ashby Pa'rva, Nr. Rugby, England".
Signed and sealed this 2 4thday of December 1974.
(SEAL) Attest:
McCOY M. GIBSON JR. c. MARSHALL DANN Attesting Officer Commissioner of Patents

Claims (7)

1. A warp knitted industrial reinforcement tape having a knitted structure comprising: a. chains of warp-knitted stitches formed of warp threads; b. at least one backing thread laid into the knitted structure beneath the chains of warp-knitted stitches; c. at least one carbon filament tow laid into the knitted structure over the chains of warp-knitted stitches; and d. at least one holding thread laid into the knitted structure over the chains of warp knitted stItches and the carbon filament tow to hold the tow in the tape.
2. A warp-knitted industrial reinforcement tape according to claim 1, wherein the threads forming chains of warp-knitted stitches, the backing threads and the holding threads are all glass fiber threads.
3. A warp-knitted industrial reinforcement tape according to claim 1, wherein at least one backing thread is at higher tension than the at least one holding thread so that the carbon filament tow stands proud of the plane of the rest of the tape.
4. A warp-knitted industrial reinforcement tape according to claim 1, wherein the backing and holding threads are at substantially the same low tension so that the carbon filament tow lies substantially flush with the rest of the tape.
5. A warp-knitted industrial reinforcement tape according to claim 1, wherein the carbon filament tow extends axially along the tape.
6. A warp-knitted industrial reinforcement tape according to claim 1, wherein the carbon filament tow extends diagonally across the tape in a zig-zag configuration.
7. A warp-knitted industrial reinforcement tape according to claim 1, wherein at least two carbon filament tows are held in the tape by the at least one holding thread, one carbon filament tow extending axially along the tape and the other carbon filament tow extending diagonally across the tape in a zig-zag configuration.
US00295337A 1972-09-06 1972-10-05 Industrial tapes Expired - Lifetime US3842628A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB5040771A GB1361669A (en) 1972-09-06 1972-09-06 Reinforcing tapes

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US (1) US3842628A (en)
JP (1) JPS5149027B2 (en)
AT (1) AT335038B (en)
AU (1) AU462082B2 (en)
CA (1) CA955768A (en)
CH (1) CH579449A5 (en)
DE (1) DE2247931A1 (en)
FR (1) FR2157881B1 (en)
GB (1) GB1361669A (en)
IT (1) IT966208B (en)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4838043A (en) * 1988-04-18 1989-06-13 New England Overseas Corporation, Inc. Circular warp knit composite cord
US5512709A (en) * 1994-02-28 1996-04-30 Jencks; Andrew D. Electromagnetic emission-shielding gasket
DE19522070A1 (en) * 1995-06-17 1996-12-19 Schaefer Drahthaekeltechnik Un Tarpaulin reinforcement insert giving more elastic stretch and shrink
US5586454A (en) * 1994-08-26 1996-12-24 Ykk Corporation Warp-knit tape for slide fastener
US20090126411A1 (en) * 2007-11-21 2009-05-21 Brian Callaway Textile-reinforced composites with high tear strength
US20150266268A1 (en) * 2014-03-19 2015-09-24 The Boeing Company Fabrication of Composite Laminates Using Temporarily Stitched Preforms
US9387727B2 (en) * 2009-07-27 2016-07-12 Nv Bekaert Sa Hybrid steel-textile reinforcement ply for radial tires

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DD160565A1 (en) * 1981-04-30 1983-09-14 Obererzgebirgische Posamenten METHOD AND DEVICE FOR PRODUCING EDGE FINISHED VINE
EP0082230B1 (en) * 1981-12-19 1986-07-16 Freiherr von Waldenfels, Roderich Textile hose material for cleaning gun barrels, and process for making the same
GB2125075A (en) * 1982-08-06 1984-02-29 Bestobell Knitted fabric resistant to high temperatures
DE68919825T2 (en) * 1988-09-02 1995-07-06 Gunze Kk Thermal molding process and knitted fabric for use in this method.
FR2993592B1 (en) * 2012-07-17 2015-02-27 Saint Gobain Adfors FIBER GLASS JOINTS BAND

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4838043A (en) * 1988-04-18 1989-06-13 New England Overseas Corporation, Inc. Circular warp knit composite cord
US5512709A (en) * 1994-02-28 1996-04-30 Jencks; Andrew D. Electromagnetic emission-shielding gasket
US5603514A (en) * 1994-02-28 1997-02-18 Jencks; Andrew D. Circular warp-knit electromagnetic emission-shielding gasket
US5586454A (en) * 1994-08-26 1996-12-24 Ykk Corporation Warp-knit tape for slide fastener
DE19522070A1 (en) * 1995-06-17 1996-12-19 Schaefer Drahthaekeltechnik Un Tarpaulin reinforcement insert giving more elastic stretch and shrink
US20090126411A1 (en) * 2007-11-21 2009-05-21 Brian Callaway Textile-reinforced composites with high tear strength
US7549303B2 (en) * 2007-11-21 2009-06-23 Milliken & Company Textile-reinforced composites with high tear strength
US9387727B2 (en) * 2009-07-27 2016-07-12 Nv Bekaert Sa Hybrid steel-textile reinforcement ply for radial tires
US20150266268A1 (en) * 2014-03-19 2015-09-24 The Boeing Company Fabrication of Composite Laminates Using Temporarily Stitched Preforms
US11046050B2 (en) 2014-03-19 2021-06-29 The Boeing Company Fabrication of composite laminates using temporarily stitched preforms
US11046049B2 (en) * 2014-03-19 2021-06-29 The Boeing Company Fabrication of composite laminates using temporarily stitched preforms

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Publication number Publication date
FR2157881B1 (en) 1976-10-29
AU4650472A (en) 1974-03-21
AU462082B2 (en) 1975-06-12
IT966208B (en) 1974-02-11
DE2247931A1 (en) 1973-05-03
AT335038B (en) 1977-02-25
CA955768A (en) 1974-10-08
ATA859972A (en) 1976-06-15
JPS5149027B2 (en) 1976-12-24
GB1361669A (en) 1974-07-30
CH579449A5 (en) 1976-09-15
JPS4850055A (en) 1973-07-14
FR2157881A1 (en) 1973-06-08

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