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WO2018184039A1 - Bande non tissée conçue pour être utilisée comme feuille de séchage - Google Patents

Bande non tissée conçue pour être utilisée comme feuille de séchage Download PDF

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Publication number
WO2018184039A1
WO2018184039A1 PCT/AT2017/000020 AT2017000020W WO2018184039A1 WO 2018184039 A1 WO2018184039 A1 WO 2018184039A1 AT 2017000020 W AT2017000020 W AT 2017000020W WO 2018184039 A1 WO2018184039 A1 WO 2018184039A1
Authority
WO
WIPO (PCT)
Prior art keywords
nonwoven
nonwoven material
filaments
web
bonding
Prior art date
Application number
PCT/AT2017/000020
Other languages
English (en)
Inventor
Tom Carlyle
Mirko Einzmann
Gisela Goldhalm
Malcolm John Hayhurst
Katharina Mayer
Ibrahim SAGERER-FORIC
Original Assignee
Lenzing Ag
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Lenzing Ag filed Critical Lenzing Ag
Priority to PCT/AT2017/000020 priority Critical patent/WO2018184039A1/fr
Publication of WO2018184039A1 publication Critical patent/WO2018184039A1/fr

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Classifications

    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
    • D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
    • D04H1/40—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
    • D04H1/42—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties characterised by the use of certain kinds of fibres insofar as this use has no preponderant influence on the consolidation of the fleece
    • D04H1/425—Cellulose series
    • D04H1/4258—Regenerated cellulose series
    • C—CHEMISTRY; METALLURGY
    • C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
    • C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
    • C11D17/00—Detergent materials or soaps characterised by their shape or physical properties
    • C11D17/04—Detergent materials or soaps characterised by their shape or physical properties combined with or containing other objects
    • C11D17/041—Compositions releasably affixed on a substrate or incorporated into a dispensing means
    • C11D17/047—Arrangements specially adapted for dry cleaning or laundry dryer related applications
    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
    • D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
    • D04H1/40—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
    • D04H1/42—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties characterised by the use of certain kinds of fibres insofar as this use has no preponderant influence on the consolidation of the fleece
    • D04H1/4374—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties characterised by the use of certain kinds of fibres insofar as this use has no preponderant influence on the consolidation of the fleece using different kinds of webs, e.g. by layering webs
    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
    • D04H3/00—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length
    • D04H3/013—Regenerated cellulose series
    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
    • D04H3/00—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length
    • D04H3/08—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length characterised by the method of strengthening or consolidating
    • D04H3/10—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length characterised by the method of strengthening or consolidating with bonds between yarns or filaments made mechanically
    • D04H3/11—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length characterised by the method of strengthening or consolidating with bonds between yarns or filaments made mechanically by fluid jet

Definitions

  • This invention relates to a nonwoven web suitable to be used as the base sheet for a dryer sheet, and, more particularly, to a 100% cellulose nonwoven web formed from essentially continuous filaments and multibonded by merged filaments, hydrogen bonding and physical intermingling of the filaments, providing the dimensional stability, lotion holding capacity, ability to release said solutions during use, in a sustainable and compostable format.
  • This invention further relates to additional bonding of this web alone, or to other webs or materials through hydroentangling to enhance these key performance properties needed in a dryer sheet.
  • essentially pure cellulose shall address the fact that cellulosic moulded bodies, e.g. made according to the lyocell process, always contain a small amount of polymers other than cellulose, namely hemicellulose. This does not influence in any way the suitability for the use according to this invention.
  • dryer sheets include a nonwoven substrate and a chemical composition comprised of at least an anti-static cationic or fabric softening agent and a fragrance. Dryer sheets containing fabric softeners are described by U.S. 3,442,692, U.S. 3,686,025, U.S. 4,834,895; U.S. 5,041 ,230, and U.S. 5,145,595.
  • the nonwoven material for dryer sheets has been the subject of much research, as the requirements are stringent and demanding. For example, consumers prefer a soft feel after use when removed from the dryer, and the nonwoven must have a sufficient surface area of the fibrous structure in order to receive and retain the required amount of the chemical composition containing the softening agents and other chemicals.
  • the nonwoven material must be open enough to receive and retain the chemical composition.
  • the nonwoven material must be capable of releasing this chemical composition at a controlled rate during the drying cycle.
  • the nonwoven material should have a dimensional stability that allows the nonwoven to remain open during the drying cycle so that sufficient contact area for lotion transfer exists. This nonwoven must meet designed thickness requirements, so that the chemical composition may be contained within the nonwoven. Proper packaging of finished dryer sheets also requires a consistent nonwoven thickness.
  • the nonwoven material must also have sufficient tensile strength and elongation, both for manufacturing and coating processes as well as in dryer use.
  • nonwovens can be used for dryer sheets, including carded nonwovens, spunlace nonwovens, needlepunch nonwovens, airlaid
  • nonwovens wetlaid nonwovens and spunlaid nonwovens. All but the last type employ primarily staple or cut fibres, or wood pulp. The last type consists of continuous filaments (either remaining as continuous or cut in the
  • This nonwoven type spunlaid nonwovens, has proven to be especially suitable for dryer sheets and is the most widely used nonwoven material for dryer sheets commercially today. Wetlaid paper and/or nonwoven materials are also used commercially.
  • U.S. 5,470,492 describes a dryer sheet based on spunlaid polyester nonwovens that meets these requirements, having a basis weight of from 0.52 to 0.58 ounces per square yard, comprising fibres with a denier of from about 2 to 6, and a caliper or thickness of about 0.16 mm to about 0.22 mm.
  • U.S. 5,883,069 adds that the nonwoven substrate based on spunlaid polyester nonwovens for dryer sheets can be improved by increasing the caliper or thickness, as well as increasing its void volume and loft. This is accomplished primarily by using larger denier fibres.
  • U.S. 5,929,026 teaches further improvements in the nonwoven substrate based on spunlaid polyester nonwovens can be accomplished by increasing the draw in the nonwovens manufacturing process as well as further increasing filament denier size.
  • Commercially available nonwoven substrates based on spunlaid nonwovens for dryer sheets today use polyester polymer as the primary filament forming material, although other thermoplastic polymers are sometimes used. These are typically neither biodegradable nor compostable.
  • Wetlaid paper and/or wetlaid nonwovens have been used for dryer sheets. These have significant disadvantages in deteriorating wet strength during the drying cycle, often leaving fibres or lint in with the laundry. This is very undesirable to consumers.
  • Wetlaid nonwovens comprising wood pulp and regenerated cellulose fibres have been developed to address these issues.
  • U.S. 7,947,644 teaches blending wood pulp with rayon or lyocell fibres to increase strength, softness and remain biodegradable and sustainable.
  • the present invention relates to the use of specially designed nonwoven materials produced using novel variants of the cellulose spunlaid nonwoven process.
  • the cellulose spunlaid nonwoven process may be also described as a solution blown process and its general principles are known to the expert.
  • the resulting nonwoven web is formed from essentially continuous filaments and multibonded by merged filaments, hydrogen bonding and physical intermingling of the filaments, providing the dimensional stability, lotion holding capacity, ability to release said solutions during use, in a sustainable and compostable format.
  • the lotion is usually made from known chemical antistatic and softening agents and/or fragrances and other additives.
  • Liquid fabric softeners have been used, added into the clothes washer. Liquid fabric softeners are effective in imparting softness and reducing static cling, but they have a number of deficiencies. Liquid fabric softeners are inconvenient to use. They are usually sold in relatively large and heavy containers; liquid fabric softeners must be poured into a small measuring cap or other measuring device to obtain the recommended quantity for a particular size load of wash. The liquid softener must then be poured into a receptacle in the washing machine where it is automatically dosed when the rinse cycle begins. Users find liquid fabric softener easy to spill, both when measuring and pouring it into the washing machine, and then one needs to clean the measuring device, and the spill area, after use.
  • Liquid fabric softeners are also known to have an adverse effect on the flammability of clothing items.
  • dry dryer sheets they are generally sheets of non-woven material impregnated with a chemical composition usually consisting of a cationic softening agent, antistatic agents, dispersing agents and a fragrance.
  • the nonwoven sheet, or web is typically a 100% thermoplastic substrate, or a paper-based substrate.
  • the softening, or other fabric treating, agent is applied to the non-woven material either in a wet state and then dried in an oven, or applied in a very low moisture content viscose solution, so that it is mostly "dry” when packaged, and provided to the consumer ready for use.
  • One, or more, dry dryer sheets are placed into the clothes dryer with the freshly laundered, damp items of clothing.
  • the lotion on the dryer sheet of nonwoven material is released over the course of the drying cycle as the chemical composition is softened as the heat is induced within the drying process. Additionally, contact with the clothing induced by the tumbling action of the dryer helps with the application of the chemical composition to the clothing articles.
  • the dry dryer sheets described above also have a number of limitations, which are created by the type of nonwoven sheet that is used.
  • One of the limitations of dry dryer sheets which use a 100% thermoplastic substrate is that a relatively high temperature is required in order to activate the softening or other fabric treating agent on the non-woven sheet and release it into the fabric of the clothing.
  • Most clothes dryers have several heat settings to accommodate different types of clothing. For example, delicate fabrics are preferably dried at lower heat settings and temperatures than clothing made from rayon, cotton or the like.
  • thermoplastic substrates are of marginal effectiveness and therefore delicate fabrics or other clothing dried at lower temperatures are not treated as effectively with this type of dry dryer sheet product, and will not exhibit the desired softness and feel when they are worn. This is a pervasive problem in many countries, where high energy cost can necessitate operating clothes dryers at lower temperatures. Additionally, it is commonly seen that clothing dried at high heat settings and temperatures will have a higher probability of static cling and wrinkling. This is often seen even when the dry dryer sheet is provided with anti-static agents. Furthermore, high drying temperatures are known to be hard on fabrics, tending to break them down over time. Another limitation of 100% thermoplastic substrates is that most are neither biodegradable nor compostable.
  • the paper-based substrates do not have a good dimensional stability such that they will remain mostly open, and not fold in on itself, when it is wet and undergoes tumbling in the dryer. This results in a very low surface area and limits the contact with clothes, and the transfer of the impregnated chemicals.
  • This nonwoven material will provide better functionality across a wider range of clothes drying conditions.
  • this nonwoven material will allow application of the chemical composition to begin sooner and to be more efficient at lower drying temperatures. Water from the wet laundry is absorbed by the
  • the nonwoven material allowing for faster heat transfer from the dryer air to the nonwoven material thereby allowing the lotion to begin softening at a lower temperature, in addition to working well at higher drying temperatures.
  • the merged filament bonding provides a nonwoven web that is very dimensionally stable (even when wet), which allows the dryer sheet to be more fully utilized during the drying process.
  • the cellulosic nonwoven web is made according to a lyocell process. Fibers and filaments derived from a lyocell process are known to wick moisture through the internal fiber structure. This allows for faster wicking of moisture from the wet laundry, enabling the lotion to begin softening at lower dryer temperatures.
  • Cellulosic fibres can be produced by various processes.
  • a lyocell fibre is spun from cellulose dissolved in N-methyl morpholine N-oxide (NMMO) by a meltblown process, in principle known from e.g. EP 1093536 B1 , EP 2013390 B1 and EP 2212456 B1.
  • meltblown it will be understood that it refers to a process that is similar or analogous to the process used for the production of synthetic thermoplastic fibres (filaments are extruded under pressure through nozzles and stretched to required degree by high velocity/high temperature extension air flowing substantially parallel to the filament direction), even though the cellulose is dissolved in solution (i.e.
  • the web is formed by a spun bonding process, where filaments are stretched via lower temperature air.
  • spunbonded synthetic fibres are longer than meltblown synthetic fibres which usually come in discrete shorter lengths. Fibres formed by the solution blown lyocell process can be continuous or discontinuous depending on process conditions such as extension air velocity, air pressure, air temperature, viscosity of the solution, cellulose molecular weight and distribution and combinations thereof.
  • the fibres are contacted with a non-solvent such as water (or water/NMMO mixture) by spraying, after extrusion but before web formation.
  • a non-solvent such as water (or water/NMMO mixture)
  • the fibres are subsequently taken up on a moving foraminous support to form a nonwoven web, washed and dried.
  • Freshly-extruded lyocell solution ('solvent spun', which will contain only, for example, 5-15% cellulose) behaves in a similar way to 'sticky' and deformable thermoplastic filaments. Causing the freshly-spun filaments to contact each other while still swollen with solvent and with a 'sticky' surface under even low pressure will cause merged filament bonding, where molecules from one filament mix irreversibly with molecules from a different filament. Once the solvent is removed and coagulation of filaments completed, this type of bonding is impossible.
  • coagulation liquor i.e. a liquid which is able to cause coagulation of the dissolved cellulose; in a lyocell process this preferably is water or a diluted solution of NMMO in water, is applied to control the merged filament bonding.
  • the amount of merged filament bonding is directly dependent on the stage of coagulation of the filaments when the filaments come into contact. The earlier in the coagulation process that the filaments come into contact, the greater the degree of filament merging that is possible. Both placement of the coagulation liquor application and the speed at which the application liquor is applied can either increase, or decrease, the rate of coagulation. Which results in control of the degree (or amount) of merged filament bonding that occurs in the material.
  • the merged filament bonding is further controlled by filament spinning nozzle design and arrangement and the configuration and temperature of filament extension air.
  • the degree of molecular alignment that is present as the solution exits the spinning nozzle has an impact on the coagulation rate. The more aligned the molecules are, the faster the coagulation rate, and conversely, the less aligned the molecules are, the slower the coagulation rate.
  • the spinning nozzle design and arrangement, along with the molecular weight of the cellulosic raw material used will determine the starting coagulation rate at the exit of the spinning nozzle. Additionally, the rate of cooling (temperature decrease) of the solution upon spinning nozzle exit will impact the coagulation rate as well.
  • At least two spinnerets also known as jets
  • spinnerets preferably between two and ten, and further preferred between 2 and 6, each one arranged to form a layer of nonwoven web
  • spinnerets are used to obtain a multilayer nonwoven material.
  • the filaments are spun using a solution of cellulose in an aqueous amine oxide and the coagulation liquor is water, preferably with a content of amine oxide not being able to dissolve cellulose, also referred to as a lyocell process; the manufacture of such a solution is in principle known, e.g. from U.S. 6,358,461 , U.S. 7,067,444, U.S. 8,012,565, U.S. 8,191 ,214, U.S. Pat. No.8,263,506 and U.S. 8,318,318; preferably the amine oxide is NMMO.
  • the present invention describes a cellulosic nonwoven web produced via a meltblown or spunbond-type process.
  • the filaments produced are subjected to touching and/or compaction and/or intermingling at various points in the process, particularly before and during initial web formation.
  • Contact between filaments where a high proportion of solvent is still present and the filaments are still swollen with said solvent causes merged filament bonding to occur.
  • the amount of solvent present as well as temperature and contact pressure controls the amount of this bonding.
  • the amount of filament intermingling and hydrogen bonding can be limited by the degree of merged filament bonding.
  • This is the result of a decrease in filament surface area and a decrease in the degree of flexibility of the filaments.
  • the degree of merged filament bonding increase, the amount of overall surface area is decreased, and the ability of cellulose to form hydrogen bonds is directly dependent on the amount of hydroxyl groups present on the cellulosic surface.
  • filament intermingling happens as the filaments contact the forming belt. The filaments are traveling at a faster rate of speed than the forming belt. Therefore, as the filament contacts the belt, it will buckle and sway side to side, and back and forth, just above the forming belt.
  • the filaments will intermingle with neighboring filaments. If the filaments touch and merge prior to the forming belt, this limits the number of neighboring filaments by which it can intermingle with. Additionally, filaments that merge prior to contacting the forming belt with not have the same degree of flexibility as a single filament and this will limit the total area over which the filament will buckle and sway.
  • the nonwoven material is dried prior to subsequent bonding/treatment.
  • the percentage of each type of bonding is controlled using a process with up to two compaction steps, where one of these compaction steps is done after step d. of the inventive process where the spun filaments are still swollen with a solvent, and one of these compaction steps is done before or in step e. of the inventive process where all or most of the solvent has been removed and the web has been wet with water.
  • control of the coagulation of the spun solution is a factor in controlling the degree of merged filament bonding.
  • This preferred embodiment concerns decreasing the coagulation rate to a state where additional compaction steps can be used after filament laydown to further increase the actual amount of merged filament boding that is achievable.
  • the present invention describes a process and product where merged filament bonding, physical intermingling and hydrogen bonding can be controlled independently.
  • the degree of merged filament bonding can limit the degree of physical intermingling and hydrogen bonding that can occur.
  • process conditions can be adjusted to optimise these bonding mechanisms between layers. This can include modifying ease of delamination of layers, if required.
  • bonding/treatment steps may optionally be added. These bonding/treatment steps may occur while the web is still wet with water, or dried (either fully or partially).
  • bonding/treatment steps may add additional bonding and/or other web property modification.
  • These other bonding/treatment steps include hydroentangling or spunlacing, needling or needlepunching, adhesive or chemically bonding.
  • various post- treatments to the web may also be applied to achieve specific product performance.
  • post-treatments it is possible to apply finishes and other chemical treatments directly to the web of this invention during production which will not then be removed, as occurs with, for example, a post-treatment hydroentanglement step.
  • Varying the degree of merged filament bonding provides unique property characteristics for nonwoven cellulose webs with regards to softness, stiffness, dimensional stability and various other properties. Properties may also be modified by altering the degree of physical intermingling before and during initial web formation. It is also possible to influence hydrogen bonding, but the desired effect of this on web properties is minor. Additionally, properties can be adjusted further by including an additional
  • bonding/treatment step such as hydroentangling, needlepunching, adhesive bonding and/or chemical bonding.
  • Each type of bonding/treatment provides benefits to the nonwoven web.
  • hydroentangling can add some strength and soften the web as well as potentially modifying bulk density; needling is typically employed for higher basis weights and used to provide additional strength; adhesive and chemical bonding can add both strength and surface treatments, like abrasive material, tackifiers, or even surface lubricants.
  • the present invention allows independent control of the key web bonding features: merged filaments, intermingling at web formation, hydrogen bonding and optional additional downstream processing. Manipulation of merged filament bonding can be varied to predominantly dictate the properties of the nonwoven web.
  • the nonwoven cellulosic web is hydroentangled. Hydroentangling is known by those skilled in the art: to provide strength to a fibrous nonwoven material, to provide some softening of the nonwoven material and/or to modify the thickness of the nonwoven material. Modification of these properties can be made such that a positive impact on the nonwoven material performance as a dryer sheet is seen. For instance, increased thickness allows the nonwoven material to hold more lotion at a given basis weight. It can also provide faster heat transfer because of increased air permeability, allowing the softening of the lotion to begin sooner in the dryer process.
  • the basis weight, i.e. without agents and other chemicals, of the nonwoven web according to the invention is from 10 grams/square meter to 25 grams/square meter. This basis weight range allows for a good balance between lotion absorption capacity and air permeability.
  • the cellulosic nonwoven material consists of multiple layers.
  • the multiple layers are bonded together using merged filament bonding, hydrogen bonding and filament intermingling of the filaments of the different layers.
  • the resulting multi-layered nonwoven material is further processed by using one or more out of the group of techniques consisting of hydroentangling, spunlacing, needling,
  • the layers of the nonwoven material are bonded together in such a manner that the dryer sheet can be delaminated into single sheets during use as a dryer sheet. Delamination of the nonwoven layers can occur due to moisture absorption, heat and friction from tumbling action with the laundry. The resulting effect is a complete separation of the layers, creating more surface contact area and thereby, more efficient active ingredient transfer to the laundry.
  • a further object of the invention is the use of a nonwoven material according to the invention as described above for manufacture of a dryer sheet.
  • a further object of the invention is a dryer sheet containing a nonwoven material according to the invention as described above.
  • a 20 gsm product of invention was characterized for its potential to take up lotion for use as a dryer sheet. This was done by measuring oil absorbency capacity against two commercial dryer sheet products, both were spunbond polyester and also being 20 gsm in basis weight
  • LAC liquid absorptive capacity
  • LAC (Mn - M k )/M k x 100
  • the product of invention showed 1.6 - fold higher oil absorbency than the commercial products. This indicates that the product of invention has the capability of taking up high amounts of dryer sheet lotion during the converting process - as these very often contain lipophilic substances.
  • the product of invention of example 1 was further investigated for its dry lint during tumble drying of black laundry.
  • a 'worst case conditions scenario' was chosen, with the product of invention being tested in the raw state without containing any lotion (which would decrease friction between the dryer sheet and the laundry).
  • Tumble drying was performed at 85°C for 30 minutes.
  • the dryer used was an Electrolux T3190.
  • the laundry consisted of 2 kg (dry weight) of wet black knitted clothing.
  • the product of invention released no visible lint to laundry during this test.
  • a 25 gsm product of the invention was compared to a fully cellulosic staple fiber carded-hydroentangled dryer sheet, also being of 25 gsm, in terms of stiffness. Stiffness was measured using a 'Handle-o-meter', according to standard method WSP 90.3, with 1 ⁇ 4 inch slot width, stainless steel surface, 1000 g beam. Sample size was to 10 x 10 cm.
  • the product of the invention exhibited a 2.5 times higher overall stiffness compared to the competitive product, meaning that it has the possibility to maintain a more open structure during tumble drying.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Wood Science & Technology (AREA)
  • Organic Chemistry (AREA)
  • Nonwoven Fabrics (AREA)

Abstract

La présente invention concerne un matériau non tissé destiné à être utilisé dans une feuille de séchage, lequel matériau est compostable et à base de ressources renouvelables, comprend une bande non-tissée cellulosique essentiellement pure produite sous la forme de filaments essentiellement continus, les filaments essentiellement continus dans le matériau de bande non-tissée cellulosique étant multiliés par des filaments fusionnés, une liaison hydrogène et un entremêlement physique des filaments ; l'invention concerne en outre l'utilisation d'un matériau non tissé pour la fabrication d'une feuille de séchage, ainsi qu'une feuille de séchage contenant un tel matériau non tissé.
PCT/AT2017/000020 2017-04-03 2017-04-03 Bande non tissée conçue pour être utilisée comme feuille de séchage WO2018184039A1 (fr)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3891325B1 (fr) * 2018-12-05 2023-06-07 Lenzing Aktiengesellschaft Procédé de récupération de solvant et de cellulose lors de la fabrication de tissus non-tissés cellulosiques
US20230183886A1 (en) * 2019-12-17 2023-06-15 Lenzing Aktiengesellschaft Process for the production of spunbonded nonwoven

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US20230183886A1 (en) * 2019-12-17 2023-06-15 Lenzing Aktiengesellschaft Process for the production of spunbonded nonwoven
US12163263B2 (en) * 2019-12-17 2024-12-10 Lenzing Aktiengesellschaft Process for the production of spunbonded nonwoven

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