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Flame retardant fiber blends comprising flame retardant cellulosic fibers and fabrics and garments made therefrom

a technology of flame retardant cellulosic fibers and blends, which is applied in the direction of weaving, transportation and packaging, mechanical equipment, etc., can solve the problems of difficult dyeing of fibers, high cost, and often at the expense of durability and thermal performan

Inactive Publication Date: 2005-02-03
EI DU PONT DE NEMOURS & CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0007] In another embodiment, the invention is one of the intimate blends described above, wherein the at least one aramid staple fiber is poly(metaphenylene isophthalamide) and the at least one flame retardant cellulosic staple fiber comprises silicon

Problems solved by technology

Although fabrics made of inherently flame retardant fibers have been very useful in protective garments, certain characteristics of these fibers present problems.
For instance, these fibers can be difficult to dye, provide uncomfortable fabric textures, and are expensive.
However, such blending often comes at the expense of durability and thermal performance.
Fabrics made from the fiber blends and yarns discussed above either naturally suffer from poor resistance to abrasion or, as disclosed in U.S. Pat. No. 4,920,000 (Green) issued on Apr. 24, 1990, utilize a large percentage of cotton fiber, which has very low abrasion resistance.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0037] A comfortable and durable fabric was prepared from warp yarns comprising an intimate blend of NOMEX® type 462 staple fiber, flame retardant (FR) rayon staple fiber, and nylon staple fiber, and fill yarns comprising an intimate blend of FR rayon staple fiber and nylon staple fiber. NOMEX® type 462 is 93% by weight of poly(m-phenylene isophthalamide)(MPD-I) staple fiber, 5% by weight poly(p-phenylene terephthalamide)(PPD-T) staple fiber, and 2% by weight carbon-core nylon-sheath static dissipative staple fibers (Type P-140 available from E.I. DuPont de Nemours of Wilmington, Del.). FR rayon is a cellulosic fiber containing a flame retardant compound, and the nylon was polyhexamethylene adipamide. A picker blend sliver of 40 weight percent of NOMEX® type 462 staple fiber, 45 weight percent of FR rayon staple fiber and 15 weight percent of nylon staple fiber was prepared and processed by the conventional cotton system into a spun yarn having twist multiplier of 3.5 using a ring s...

example 2

[0039] A comfortable and durable fabric was prepared as in Example 1, however, the warp yarns were made from 20 weight percent of NOMEX® type 462 staple fiber, 55 weight percent of FR rayon staple fiber, and 25 weight percent of nylon staple fiber, the spun yarns having a twist multiplier of 3.7. The yarn so made was a 24.6 tex (24 cotton count) single yarn. Two single yarns were then plied on the plying machine to make a two-ply yarn. Using a similar process and the same twist as in Example 1, a single yarn was made comprising a blend of 20 weight percent NOMEX® type 462 staple fiber and 80 weight percent FR rayon staple fiber, having a linear density of 32.8 tex (18 cotton count). Two of these yarns were then plied to form a ply yarn.

[0040] The NOMEX® / FR rayon / Nylon yarn and NOMEX® / FR rayon yarn were used as the warp and fill, respectively, in a shuttle loom in a 3×1 twill construction. The greige twill fabric had a construction of 26 ends×17 picks per cm (66 ends×44 picks per in...

example 3

[0041] A fabric was prepared as in Example 1, however, both the warp and fill yarns were made from 50 weight percent of NOMEX® type 462 staple fiber, 35 weight percent of VISIL® staple fiber, and 15 weight percent of nylon staple fiber, the spun yarns having a twist multiplier of 3.7. The yarn so made was a 24.6 tex (24 cotton count) single yarn. Two of these yarns were then plied on the plying machine to make a two-ply yarn. Using the same fiber composition, process, and twist multiplier, a single yarn of 32.8 tex (18 cotton count) was made. Two of these were then plied to form a ply yarn.

[0042] The NOMEX® / VISIL® / nylon yarns were used as the warp and fill in a shuttle loom in a 3×1 twill construction. The greige twill fabric had a construction of 23 ends×16 picks per cm (58 ends×40 picks per inch), and basis weight of 247.5 g / m2 (7.3 oz / yd2). The greige twill fabric prepared as described above was scoured in hot water and dried under low tension. The scoured fabric was then dyed u...

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Abstract

An intimate blend of staple fibers has from 10 to 75 parts by weight of at least one aramid staple fiber, from 15 to 80 parts by weight of at least one flame retardant cellulosic staple fiber, and from 5 to 30 parts by weight of at least one polyamide staple fiber. The intimate blend of staple fibers provides yarns and fabrics that are flame retardant, also referred to as fire resistant, and can be used to make flame retardant articles, such as clothing. The flame retardant fabrics may have a basis weight from 4 to 15 ounces per square yard.

Description

BACKGROUND OF THE INVENTION [0001] There is an ongoing need for flame retardant, also referred to as fire resistant, fabrics that can be used to make clothing suitable for people who work near flames, high temperatures, or electric arc flashes. In addition to showing excellent thermal performance, an effective flame retardant fabric should be durable, comfortable, and produced at low cost. Although fabrics made of inherently flame retardant fibers have been very useful in protective garments, certain characteristics of these fibers present problems. For instance, these fibers can be difficult to dye, provide uncomfortable fabric textures, and are expensive. To address these problems, inherently flame retardant fibers have been blended with fibers made of other materials. Fiber blending can be used to obtain an end fabric that combines the beneficial characteristics of each of the constituent fibers. However, such blending often comes at the expense of durability and thermal performa...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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Application Information

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IPC IPC(8): D02G3/04D02G3/44D03D15/12D04H1/42
CPCD02G3/047D02G3/443D03D15/12D04H1/42Y10T428/2915D10B2331/02D10B2331/021Y10T428/2904D10B2201/00D04H1/425D04H1/4334D04H1/4342Y10T442/3065Y10T442/3976D03D15/513D04H1/43828D04H1/43835D02G3/04D02G3/44
Inventor ZHU, REIYAOGUCKERT, DEBBIELOVASIC, SUSAN L.PARRY, ROGER
Owner EI DU PONT DE NEMOURS & CO
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