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EP1117859A1 - Tissus ignifuges - Google Patents

Tissus ignifuges

Info

Publication number
EP1117859A1
EP1117859A1 EP99944025A EP99944025A EP1117859A1 EP 1117859 A1 EP1117859 A1 EP 1117859A1 EP 99944025 A EP99944025 A EP 99944025A EP 99944025 A EP99944025 A EP 99944025A EP 1117859 A1 EP1117859 A1 EP 1117859A1
Authority
EP
European Patent Office
Prior art keywords
fibers
fabric
warp
aramid
yarns
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.)
Granted
Application number
EP99944025A
Other languages
German (de)
English (en)
Other versions
EP1117859B1 (fr
Inventor
Donald E. Shaffer
Hamid Moayed Ghorashi
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
EIDP Inc
Original Assignee
EI Du Pont de Nemours and Co
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 EI Du Pont de Nemours and Co filed Critical EI Du Pont de Nemours and Co
Publication of EP1117859A1 publication Critical patent/EP1117859A1/fr
Application granted granted Critical
Publication of EP1117859B1 publication Critical patent/EP1117859B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • 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
    • 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
    • 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]
    • 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]
    • Y10T442/3179—Woven fabric is characterized by a particular or differential weave other than fabric in which the strand denier or warp/weft pick count is specified
    • 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]
    • Y10T442/3179—Woven fabric is characterized by a particular or differential weave other than fabric in which the strand denier or warp/weft pick count is specified
    • Y10T442/322—Warp differs from weft
    • 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]
    • Y10T442/3179—Woven fabric is characterized by a particular or differential weave other than fabric in which the strand denier or warp/weft pick count is specified
    • Y10T442/322—Warp differs from weft
    • Y10T442/3228—Materials differ

Definitions

  • Fabrics made of high temperature and flame resistant fibers have been very useful in protective apparel. Although many advances have been made in designing comfortable fabrics and garments made from these fibers, there are still certain aesthetic and subjective reasons to desire flame resistant apparel which also incorporate natural fibers . To meet this need, fabrics have been made from combination yarns, that is yarns containing both natural and high temperature and flame resistant staple fibers. Although fabrics made from such combination yarns may be made into comfortable garments, the fabric's resistance to high temperature and flame has been reduced to such an extent that the addition of flame retardants are necessary to enhance the thermal protection of the fabric. Typically flame retardants are applied to the natural staple fibers or the fabrics made from these combination yarns as topical treatments. The addition of topical treatments may add weight and often stiffness to the fabric as well as provide only temporary effectiveness since such treated fabrics tends to lose this protection with wash and or wear cycles .
  • the object of the present invention is to provide a fabric combining flame resistance and comfort that may be formulated in a way to balance thermal performance and cost.
  • Another object of the present invention is to provide a comfortable, flame resistant and cost efficient fabric that does not require the use of topical flame retardant treatments.
  • Another object of the present invention is to provide a strong fabric where flame resistance and cost may be balanced. Fabrics have been made from combination yarns to achieve certain fabric properties.
  • US Pat. Nos . 4,941,884 and 4,900,613 to Green disclose comfortable fabrics of high durability made from warp yarns containing a blend of at least 15% by weight high modulus and at least 30 % by weight low modulus fibers woven with fill yarns containing low modulus fibers (usually cotton) . Blended high and low modulus fibers were required in the warp yarns to provide proper shrinkage for increasing the abrasion resistance.
  • Canadian Patent No. 1034842 discloses a protective fabric comprising interwoven warp and weft threads of dissimilar properties with an asymmetric weave, changing from one surface of the fabric to the opposite surface of the fabric to achieve varying energy absorption properties throughout the depth of the fabric .
  • European Patent Application 310,199 discloses a bulletproof woven fabric made from filaments or yarns having high strengths and high moduli and consisting of polymers of ultrahigh molecular weights, wherein the warp filaments or yarns consist of other polymers than the weft filaments or yarns.
  • the present invention provides a woven flame resistant fabric comprising dissimilar warp and fill yarns, the warp yarns comprise staple or filament fibers and have a Limiting Oxygen Index of at least 27, and the fill yarns comprise natural fibers and wherein the ratio of warp to fill yarn ends in the fabric is at least 1.0. More preferred are warp yarns have a Limiting Oxygen Index of 28 or more.
  • the fibers of the warp yarn may have a modulus of from about 100 to 800 g/dtex. Although fibers moduli of from 100 to about 250 g/dtex may be preferred for some uses.
  • the warp yarn comprises fibers selected from the group consisting of aramid, polybenzimidazole, polybenzoxazole, melamine, poly (phenylene sulfide) ,polybenzothiazoles, polyimide, polyetherimide, polyamidimides, novaloid and modacrylic fibers and the fill yarn fibers are selected from the group consisting of cotton, silk, wool, rayon and FR rayon.
  • the warp yarn may be formed of fibers that are m-aramid or p-aramid fibers or mixtures of these fibers and may also incorporate about 5% by weight or less electrically conductive fiber, particularly sheath- carbon-core fibers.
  • a preferred fabric for protective apparel is a fabric wherein the fibers of warp yarn are sulfonated para-aramid fibers and the fill yarn is cotton.
  • P- aramid fibers having a modulus of from 100 to not more than 200 g/dtex are particularly useful in fabrics for protective apparel and garment uses.
  • the present invention also provides protective apparel comprising a woven flame resistant fabric having dissimilar warp and fill yarns, the warp yarns comprise staple or filament fibers and have a Limiting Oxygen Index of at least 27, and the fill yarns comprise natural fibers and wherein the ratio of warp to fill yarn ends in the fabric is at least 1.0.
  • the woven fabric contains warp yarn fibers selected from the group consisting of aramid, polybenzimidazole, polybenzoxazole, melamine, poly (phenylene sulfide) , polybenzothiazoles , polyimide, polyetherimide, polyamidimides, novaloid and modacrylic fibers and the fill yarn fibers are selected from the group consisting of cotton, silk, wool, rayon and FR rayon.
  • Useful protective apparel may be made where the warp yarn fibers are m-aramid and the fill yarn fibers are FR rayon. More preferred is protective apparel where the warp yarns are p-aramid fibers having a modulus of from 100 to about 250 g/dtex. Most preferred is protective apparel where the warp yarns are sulfonated p-aramid fibers and the fill fibers are cotton.
  • the warp yarn may further comprise about 5% by weight or less of an electrically conductive fiber. And for protective apparel it is preferred that the warp yarns are staple fibers .
  • This invention provides flame resistant woven fabrics, where the yarns used for the warp and the fill (or weft) are not alike.
  • This fabric may be used in protective apparel or for tents, tarps and other uses where a balance of fabric stiffness, fabric durability, high temperature, flame resistance, and low cost are desired.
  • warp yarn fiber selection provides the fabric with high temperature and flame resistance
  • fill yarn selection provides the comfort and cost efficiency.
  • the warp yarns partially cover protect the fill yarns. And it is believed that the warp yarns thereby protect the fill yarns from flame and high temperature.
  • the warp yarns may then be selected to have the properties that make the fabric comfortable and cost effective.
  • the warp yarns are made high temperature and flame resistant fibers.
  • High temperature and flame resistant fibers those fibers having a Limiting Oxygen Index (LOI) of at least about 27, and preferably 28 or more.
  • Preferred fill yarns are yarns made from natural fibers, but fill yarns could be selected from natural or synthetic fibers. Special consideration must be given the selection of fill and warp yarns to provide a fabric that is suitable for a protective apparel. Even with these special considerations, fabrics of the present invention encompass a wide selection of yarns, and provide strong, comfortable and durable fabrics that meet military and industrial standards for high temperature and flame resistance.
  • fill yarns of this invention are selected from natural fibers.
  • Natural fibers are those fibers found or derived from nature, including fibers such as cotton, rayon, and other cellulose based fibers as well as those fibers which are deemed to have some natural flame retarding properties, such as wool and silk.
  • FR rayon Rayon spun containing a flame retardant
  • Nylon, polyester and other synthetic fibers which melt on exposure to high temperature are not suitable when used as a major component in a fill yarn for a protective apparel fabric. Since these fibers melt on exposure to high temperatures, their presence may contribute to or aggravate burns.
  • fibers from polymers such as nylon and polyester may be acceptable for use when blended with natural fibers.
  • Fill yarns of the present invention may also contain electrically conductive fibers such as synthetic sheath-carbon-core staple or continuous filament fibers. Such fibers reduce the possibility of sparking and are much preferred over fibers having a topical antistatic treatment. It is recommended that such sheath-core fibers be used at a concentration of 5% by weight .
  • the warp yarns in the present invention must have an LOI of 27 or more.
  • High temperature and flame resistant fibers useful in the present invention for making protective apparel fabrics include, for example, aramid, polybenzimidazole, polybenzoxazole, melamine, poly (phenylene sulfide) , polybenzothiazoles , polyimide, polyetherimide, polyamidimides, novaloid and modacrylic fibers. These fibers decompose without the production of noxious fumes when exposed to flame.
  • Useful fibers include those sold under the trademarks: Kevlar (E.I. DuPont, NOMEX (E.I DuPont), BASOFIL (BASF), TECHNORA (Akzo) KYNOL (Carborundum) and RYTON (Phillips Chemical Company) .
  • the warp yarn as a whole must have a LOI of 27 or more for the fabrics of the present invention.
  • the actual selection of fibers used to make the warp yarn will be determined by the Thermal Protective Performance Test (TPP)or other evaluation standards that the fabric is required to meet. For example, actual exposure conditions or temperatures and the length of the exposure (time) will influence the selection of fibers used in the warp and /or the fill. In some cases the warp may contain up to as much as
  • Warp yarns of the present invention may also contain electrically conductive fibers such as synthetic sheath-carbon-core staple or continuous filament fibers . Such fibers reduce the possibility of sparking and are much preferred over fibers having a topical antistatic treatment. Non-permanent topical treatments compromise the performance of the fabric of the present invention which is inherently heat and flame resistant. When sheath-core electrically conductive fibers are incorporated into the warp yarn, it is recommended that the concentration of these fibers be about 5% by weight or less in the warp yarn.
  • Warp yarn fibers having a modulus of from 100 to 800 g/dtex are suitable for use in the present invention.
  • Lower modulus fibers that is those fibers having a modulus of less than 250 g/dtex or in the range of 100 to 200 g/dtex are preferred for apparel fabrics which are in direct contact with the wearer so that the fabric has adequate comfort .
  • Higher modulus fibers may be acceptable for use in fabrics that are to be used for specific purposes or in specific locations within a garment where wearer comfort is of less importance.
  • Such fibers include high modulus fibers such as disclosed in US
  • Fibers having lower moduli include those made by the processes disclosed in US Pat. No. 5,336,734 to Bowen et al . , US Pat. No. 5,330,698 to Allen et al . & US Pat. No. 3,671,542 to Kwolek. Since the use of the fibers having a lower modulus provides a fabric of improved comfort, p- aramids having moduli in the range of from about 100 to less than 200 g/dtex are preferred. Most preferred are the sulfonated p-aramid made according to in US Pat. No. 5,336,734.
  • the aramid fibers may be made from homo or co-polymers. The only requirement is that the warp yarn have an LOI of 27 or more.
  • the warp yarns be made from fibers which are all one type of high temperature and flame resistant polymer.
  • the warp yarn may be 100% by weight p- aramid.
  • warp yarns made from mixtures of high temperature and flame resistant fibers may be used.
  • the use of mixed staple fibers may also provide additional comfort or aid in providing additional thermal performance.
  • a commercial blend of 5% by weight p-aramid and 95% by weight m-aramid fiber yarns is used for its improved thermal performance over 100% m-aramid yarns.
  • Another useful blend of p-and m- aramid fibers for the warp yarn is 60% by weight p- aramid, 40% by weight m-aramid. Staple fibers made from stretch broken continuous filament fibers as well as cut staple fibers may be used in making the warp yarns of the present invention.
  • the warp yarns themselves may be of different polymer compositions or could be made from plys of different staple yarns or continuous filament fibers so long as the warp yarns meet the LOI requirement .
  • Selection of warp yarns or fiber mixtures for warp yarns employed in the design of the fabrics of the present invention may be used to achieve an overall fabric flame resistance that meets various industry requirements or standards.
  • a fabric of the desired comfort, durability, cost and flame resistance can be designed according to the present invention for specific situations. Unless the fabric is intended for a non-garment use, flame resistant or retardant topical treatments applied to fabrics are not recommended for use in the present invention since these fabric treatments stiffen the fabric, decrease wearer comfort and tend to be temporary in nature.
  • fill yarns according to the present invention are typically made from one type of natural fiber, for example 100% cotton fill yarns. Where maximum mechanical strength is not essential, mixtures of staple fibers may be used in the fill yarns, for example, fill yarns containing cotton and wool.
  • the ratio of warp ends per inch to fill ends per inch in the fabrics of the present invention range from 1 to about 3, and a range of 1 to 2.5 is preferred. For garment use, this ratio range is essential since fibers in the warp yarns and the fibers in the fill yarns work together not only to provide flame resistance and durability but also comfort.
  • all warp yarn fibers are inherently flame resistant, that is the warp yarns containing only fibers having an LOI of 27 or more. It is preferred that the fill yarns be from natural fibers. Although there is no limitation on the LOI of the fill yarn fibers, fill yarns may, if desired have an LOI of 27 or more.
  • the present invention provides a cost effective flame resistant fabric that may be designed for both comfort and mechanical performance.
  • the fabrics of this invention are useful in various protective garments, including fireman's turnout coats, military apparel and various types of protective overalls. Further, these fabrics can be made into shirts, pants, and other apparel normally worn in industrial or hazardous environments. The fabrics of this invention may also be useful in non-garment applications where one desires to balance thermal protection and cost. Tarps, tents or other fabrics used to cover and protect people or property may be made from the fabrics of the present invention.
  • Plain weave, ripstop fabrics were prepared from the following yarns and were woven according to MIL-C-4436.
  • Yarns were as follows: the yarns identified as m-aramid are staple fiber yarn of 100% poly (phenyleneisophthalamide) ; those identified as Z200 are staple yarns of sulfonated p-aramid fiber sold by E.I. DuPont of Wilmington, DE as Z200; FR rayon indicates fire retardant rayon staple yarns; blends of fiber in staple yarns are identified by the fibers in the blend. These are nylon/cotton; blends of m- aramid/cotton and blends of m-aramid/cotton/Z200 and blends of Z200/cotton. (NOMEX is a registered trademark of E. I . DuPont. )
  • the resulting fabrics were tested for grab strength (ASTM-D-5034 ; results are reported in pounds (lbs)) ; trapezoidal tear strength (ASTM-D-5733 ; results are reported in pounds (lbs)) ; Elemdorf tear strength (ASTM D1424 ; results are reported in pounds ( lb .)) ; Tabor abrasion( ASTM-D-1044 ; results are reported in cycles to failure) and Thermal Protective Performance, TPP (method reported in Fire Technology V.
  • the control fabric was a commercial fabric of 50% nylon and 50% cotton yarn in both the warp and fill direction. This fabric was selected as the control because it is a durable and comfortable fabric used to make garments for military, industrial and general work garments. It is a strong, durable and comfortable fabric, but does not provide thermal protection. As the Table below shows, the use of warp yarns according to the present invention provides a fabric having surprising thermal protection properties combined with strength and durability.
  • the fill yarn was FR rayon with a nylon ripstop filament yarn, The total composition of the fill yarn in weight % was 97 FR rayon 3 nylon filament.
  • fabric weight is shown in oz/yd 2 , Grab Strength (Grab), Trapezoidal Tear (trap tear) and Elemdorf Tear are in pounds; Tabor Abrasion (Tabor) is in cycles to failure.
  • the term w/f means the result reported in the warp and then the fill direction.
  • the warp and fill yarn compositions are reported in weight % of the respective yarn.
  • the ratios are shown as weight % as indicated.
  • 50/50 nylon/cotton means a 50% by weight mix of nylon fibers with a 50% by weight mix of cotton fibers were used in making the yarn.
  • Ignite in air means ignition in air. The result is reported as either yes (Y) or no (N) . If the fabric does not ignite, it means that the fabric, after being exposed to a flame for 3 to 5 seconds, did not ignite and continue to burn.
  • the fabric samples A, B and C are fabrics of the present invention. Samples D and E are present to provide a comparison between fabrics of the present invention and fabrics made according to prior art methods of making thermally protective fabrics.
  • Samples D and E are woven from intimately blended staple yarns .
  • Fabrics A and B compared to E show the same differences as those of the C and D comparison, that is in each case a stronger fabric that does not ignite in air.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Textile Engineering (AREA)
  • Woven Fabrics (AREA)
  • Yarns And Mechanical Finishing Of Yarns Or Ropes (AREA)
  • Tents Or Canopies (AREA)
  • Professional, Industrial, Or Sporting Protective Garments (AREA)

Abstract

Cette invention a trait à un tissu tissé ignifugé comprenant des fils différents, de chaîne et de trame. Les fils de chaîne, qui comportent des fibres discontinues ou des fibres filaments, ont un indice limite d'oxygène d'au moins 27. Les fils de trame comportent des fibres naturelles. Le rapport chaîne/fils de trame dans le tissu est d'au moins 1,0.
EP99944025A 1998-09-28 1999-08-31 Tissus ignifuges Expired - Lifetime EP1117859B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US161811 1988-02-29
US16181198A 1998-09-28 1998-09-28
PCT/US1999/019951 WO2000018993A1 (fr) 1998-09-28 1999-08-31 Tissus ignifuges

Publications (2)

Publication Number Publication Date
EP1117859A1 true EP1117859A1 (fr) 2001-07-25
EP1117859B1 EP1117859B1 (fr) 2003-03-26

Family

ID=22582848

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99944025A Expired - Lifetime EP1117859B1 (fr) 1998-09-28 1999-08-31 Tissus ignifuges

Country Status (11)

Country Link
US (1) US20010009832A1 (fr)
EP (1) EP1117859B1 (fr)
JP (1) JP2002525449A (fr)
CN (1) CN1100903C (fr)
AU (1) AU751087B2 (fr)
BR (1) BR9914452A (fr)
CA (1) CA2339583A1 (fr)
DE (1) DE69906334T2 (fr)
ES (1) ES2195607T3 (fr)
RU (1) RU2204631C2 (fr)
WO (1) WO2000018993A1 (fr)

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US20010009832A1 (en) 2001-07-26
AU5700399A (en) 2000-04-17
BR9914452A (pt) 2001-08-14
DE69906334T2 (de) 2004-02-12
JP2002525449A (ja) 2002-08-13
EP1117859B1 (fr) 2003-03-26
CN1320179A (zh) 2001-10-31
AU751087B2 (en) 2002-08-08
CN1100903C (zh) 2003-02-05
WO2000018993A1 (fr) 2000-04-06
RU2204631C2 (ru) 2003-05-20
CA2339583A1 (fr) 2000-04-06
DE69906334D1 (de) 2003-04-30

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