KR20080062319A - Core spun yarn for manufacturing a safety clothes - Google Patents

Abstract

A core spun yarn for manufacturing a safety clothes is provided to encompass the circumference of a core yarn by means of a core wrapper made of the coldproof staple fiber. An ultra lightweight 2-core spun yarn includes a core(11) made of heat resistance property. A core wrapper(12) encompasses and coats the core and is made of fiber with high strength, sense of touch and the good dimension stability. The core is extended toward the shaft direction and length direction of the core spun yarn(10). The core wrapper is also extended toward a spiral direction of the circumference of the core. A small portion of the core wrapper is separated so that a contact combining fiber(13) wound around the circumference of the most part of fibers is formed. Since the coat wrapper is made of the coldproof fiber, the outer surface of the fiber has the excellent appearance and properties of the fiber for constructing the core wrapper. Further, the core wrapper is selected from cotton, wool, polyester fiber, modacrylic fiber, synthetic fiber, rayon fiber and a mixed fiber thereof.

Description

Core spun yarn for manufacturing a safety clothes

1 is an enlarged view showing a portion of the core spun yarn of the present invention;

2 is a partial schematic view of an air jet spinning apparatus used to make the core spun yarn of the present invention.

3 is an enlarged perspective view of a letter knitted with the core spun yarn of FIG.

The present invention relates to a core spun yarn (hereinafter referred to as '2-core spun yarn') consisting of two components useful for the manufacture of a high-strength, heat-resistant and improved dimensional stability safety cloth. It relates to a core spun yarn for the production of safety clothing composed of a core and a core wrapper made of a high strength and dimensionally stable fiber which surrounds and covers the screen.

In general, methods for producing high strength, heat resistant fabrics composed of various types of yarns have been known. For example, body armor, industrial uniforms, firefighter uniforms, and military protective uniforms used in hazardous locations have been made from woven fabrics of nonsynthetic fibers such as cotton or wool. These fabrics are then treated with refractory based on conventional halogens and phosphorus, or one of them. By the way, uniforms made of this type of fabric are limited in medical life and heavier than non-fire resistant fabrics. Chemical treatment typically increases the weight of the fabric by about 15% to 20%. Burning this type of fabric results in brittle charcoal as the fabric moves.

Also known are fire resistant safety suits made of woven fabrics formed of non-combustible or heat resistant fibers or blended with non-combustible fibers such as Nomex, Kevlar, Heraclon or PBI. These fabrics show thermal stability but are very expensive to produce and lack the comfort, water absorption and dyeing properties of fabrics made from natural fiber yarns.

US Pat. Nos. 4,381,639, 4,500,593 and 4,670,327 introduce yarns for heat resistant fabrics comprising continuous glass filament coatings coated with a layer of heat resistant aramid fibers. However, the yarns and fabrics shown in these patents are very expensive to produce because the fibers required to make these yarns and fabrics are expensive. In addition, the yarns and fabrics shown in these patents have the appearance characteristics of aramid fibers and thus do not exhibit the dyeability and comfort of conventional natural fibers such as cotton and wool.

U. S. Patent No. 4,331, 729 shows a heat resistant fiber made of yarn comprising carbon filament screening and aramid coated yarns. The yarns and heat resistant fabrics shown in these patents include disadvantages of the type as indicated in the prior art patents.

An object of the present invention is to provide a core spun yarn made of fibers having excellent heat resistance, ultra-light weight, high strength, touch feeling, and dimensional stability.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

The screen 11 of heat resistant fibers in Figures 1 and 2 is essentially aramid fibers such as Kevlar and Nomex, polybenzimidazole fibers such as PBI, or Panox from RK Textiles, Ltd. And thermally stabilized and oxidized polyacrylonitrile fibers such as Rastane of Asahi Chemical Co. or a blend of these fibers. The coated yarn 12 is selected from cotton, wool, polyester, modacryl, other synthetic fibers, rayon or blended yarns of these fibers.

The screening 11 of the heat resistant fiber is about 20% to 25% of the total weight of the core spun yarn 10, and the coated yarn 12 of the fiber having excellent strength, touch feeling, and dimensional stability is the total weight of the core spun yarn 10. About 80% to 75%. Only when the ratio of screening and coating yarn is within the above range, a core spun yarn having excellent strength, touch feeling, and dimensional stability with excellent heat resistance can be made.

The screen 11 may be composed entirely of aramid fibers or may be composed of a mixture of aramid fibers and polybenzimidazole fibers. The coated yarn 12 completely surrounds the screen 11 so that the fibers constituting the screen 11 are completely hidden from the appearance of the fabric.

as mentioned above. Core spun yarn 10 of the present invention is preferably manufactured by Murata air jet spinning device of the type shown schematically in FIG. Murata air jet spinning devices are described in several patents, including US Pat. Nos. 4,718,225, 4,551,887, and 4,497,167. As schematically shown in Fig. 2, the air jet spinning apparatus includes a coating yarn made of fibers having high strength, a sense of touch, and dimensional stability in order to form a coating yarn 11 made of heat-resistant fibers to surround and cover the coating. And an inlet trompat 15 for feeding along the sliver of 12). The fibers are then passed through a pair of draw rolls 16, a swirling first air jet nozzle 17 and a second air jet nozzle 18 of flow. This yarn is drawn from the second air jet nozzle 18 by the delivery roll assembly 19 and then wound around a winding bundle (not shown). As schematically shown in FIG. 2, the first and second air jet nozzles 17 and 18 rotate in opposite directions to allow the coated yarn 12 to wrap around the screen 11 in opposite directions. That is, the first and second air jet nozzles 17 and 18 which operate in the opposite direction induce a part of the staple fibers to separate, thereby winding the unseparated staple fibers around the staple fibers, which are wound into the screening 11. The state of the coated yarn 12 which closely adheres and surrounds and covers is maintained.

The ultralight core spun yarn of the present invention is manufactured with cotton yarn counts of 22/1 (242 denier), 20/1 (266 denier) and 18/1 (295 denier).

The air jet nozzles 17 and 18 allow the coated yarn to coat the surroundings of the screen, and the yarn and fabrics made therefrom have very little twist, rotation, and color, so that the surface properties of the coated yarn Has the properties of the fibers to form.

When the fabric formed of the ultra-light 2-core spun yarn of the present invention is exposed to flame and high temperature, the coated yarn made of a fiber having excellent strength, touch feeling, and dimensional stability that surrounds the screen is burned and burned, but screened to provide an insulating wall. Remains around.

The screening of the heat resistant fiber remains undamaged even after the sheath is burned, leaving it for charcoal to block the flow of oxygen and other gases, forming a lattice and the appearance of the fabric after the remains of the support lattice are burned. It provides a structure for maintaining the same.

The corespun yarn of the present invention can produce expensive heat resistant fibers in small amounts by weight, preferably about 20%, and can be produced at a much more economical cost than fire resistant fabrics formed from yarns containing large amounts of heat resistant fibers. For example, Kevlar costs about $ 25 to $ 30 per kg for screening heat-resistant fibers, and about $ 14 to $ 16 per kg for cotyled lyocell fibers. Therefore, by using about 80% of lyocell fibers, the manufacturing cost of the core spun yarn of the present invention can be much reduced.

Table 1 below shows the property comparison table.

Exposing the fabric made of the core spun yarn according to the present invention to high temperature and flames causes the coated yarn to burn black and remain around the screening of heat resistant fibers to make the insulation walls. This creates an insulating air layer between the skin and the fabric. This property is important in fires where firefighters wearing shirts made of this fabric must be thermally protected by an insulating layer of air between his clothing and skin, and the examination will not be compromised if the sheath burns out.

Fabrics knitted with the corespun yarn of the present invention can be treated using conventional fire retardants similar to the fire treatment methods used for dyeing, printing and producing fabrics made from 100% cotton fibers. However, the weight applied to the fabric by the refractory treatment is substantially reduced by about 10% to 12% because the screening, which is a heat resistant fiber, does not absorb the fire resistant agent.

Fabrics made from the corespun yarn of the present invention do not melt, drip, stray or afterglow when burned. The carbonized outer portion of the fabric maintains the flexibility and integrity of the unburned portion of the fabric.

As broadly indicated by reference numeral 10 of FIG. 1, the ultra-light 2-core spun yarn of the present invention is a fiber having excellent strength, touch feeling, and dimensional stability that is coated by covering the screen 11 and the screen 11 of heat-resistant fibers. Coated yarn 12 is included. As shown in FIG. 1, the screening 11 made of heat resistant fiber extends in the axial direction and the lengthwise direction of the core spun yarn 10, and most of the coated yarn 12 made of a fiber having excellent strength, touch feeling, and dimensional stability is The examination (11) extends in the helical direction around it. A small portion of the coated yarn 12 is separated to form stitched yarns that spirally wrap around the majority of the fibers, as indicated at 13. Since the coated yarn 12 made of cold-resistant staple fibers surrounds and covers the periphery of the screening 11, the outer surface of the yarn has an appearance of fibers having excellent strength, touch feeling, and dimensional stability that constitute the coated yarn 12. Has characteristics.

<Examples and Comparative Examples>

The following examples are described to illustrate one form of core spun yarn manufactured according to the present invention. One end of the 50 hank roving of the heat resistant Kevlar screen 11, which provides a weight of 20% of the total yarn weight, is fed to the inlet end of the inlet trompat 15. At the same time one end of a 100% Lyocell sliver is provided at the distal end of the inlet trumpet 15, which provides a weight of up to 80% of the total net weight. The screening is fed over the iocell slivers so that the lyocell fibers are wound around the screening. The ultralight core spun yarn obtained by this air jet spinning process produces a knitted jersey structure 20 having the flat jersey structure shown in FIG. The core spun yarn 10 continuously forms a circular ring course in the knitted fabric 20.

This knitted fabric 20 is particularly suitable for the use of a protective cover or a firefighter's underwear and can be dyed, fireproof and exhibit excellent touch stability and high strength compared to cotton. This knitted fabric has desirable fire resistance properties that are not present in knitted fabrics consisting solely of cotton fibers, while having a feel and appearance similar to those of 100% cotton fibers.

When treated with the National Fire Prevention Association Test Method (NFPA 701), which includes a 12-second vertical combustion process in a Bunsen combustor flame, the fabric is less than 3.81 cm free of afterglow or afterglow. The length of carbonization is shown. Fabrics exposed twice a second for 12 seconds to hot flowing butane flames in accordance with Federal Test Method 5905 have a vertical combustion of 0 seconds of residual flame and 22% of combustion, compared to fully cotton and chemically fire resistant. Similar weights and similar types of fabrics treated result in 6 seconds of residual flame and 45% combustion. Throughout the whole burn test, the remaining carbonized part of the fabric is pliable, flawless and shows no brittleness, meltability or fabric shrinkage. While burning the sheath of lyocell fibers, the carbonized portion remains in a position surrounding the screening of heat resistant Kevlar fibers to form a thermal barrier and the Kevlar screening provides a matrix or lattice to prevent the fabric from breaking. The insulation wall prevents the flame from passing through the fabric and touching the skin of the person wearing the suit.

In the fabric forming the fire resistant safety suit, as described herein, the corespun yarn 10 comprises a screen 11 of two components, a heat resistant fiber extending in the axial or longitudinal direction of the yarn, and this screening (11) A coated yarn 12 made of a fiber having high strength, a feeling of touch, and dimensional stability, which extends in the helical direction and covers the screen, is coated.

The screening 11 of heat resistant fibers is essentially selected from fibers consisting of aramid fibers, polybenzimidazole fibers and heat stabilized and oxidized polyacrylonitrile fibers, and the screening 11 when burned in a hot flame It stays as it is. The coated yarn 12 provides the desired surface properties of the fabric composed of this core spun yarn. When the fabric composed of the core spun yarn according to the present invention is exposed to a high temperature flame, the coated yarn 12 burns and becomes charcoal but remains around the screening 11 and maintains the same flexibility and original appearance as the unburned fibers.

The most preferred embodiments for carrying out the present invention have been described in the drawings and the specification, and specific terms used in the present specification are used in a general and technical sense, and are not intended to limit the scope of the present invention. It is intended to limit the scope of the claims.

The core spun yarn according to the present invention has the following advantages.

It is possible to produce fire resistant safety suits which have the appearance, feel, dyeability and comfort which are the general characteristics of fabrics which are composed of conventional natural fibers and do not have fire resistance properties.

The 2-core spun yarn prepared by the present invention constitutes 20% to 25% of the total weight of the core spun yarn, which is composed of the heat-resistant fibers, and the total weight of the core spun yarn of the coated yarn of fibers having high strength, touch feeling, and dimensional stability. By constructing 80% to 75% of the fire resistant safety clothing can be manufactured in a lighter weight than conventional fire resistant fibers.

The 2-core spun yarn prepared according to the present invention can be manufactured economically cheaper than the fire resistant fiber made of the existing 100% heat resistant fiber only.

The 2-core spun yarn prepared according to the present invention can be made lighter than the conventional garment made of only 100% heat-resistant fibers.

Claims (4)

Fiber composed of aramid fiber, polybenzimidazole fiber and heat stabilized and oxidized polyacrylonitrile fiber, selected from heat-resistant fibers, and the high-strength, touch-sensitive, and dimensional stability fibers that surround the screen. Core spun yarn for the manufacture of safety clothing, characterized in that consisting of a coated yarn. The method of claim 1, wherein the screening of the heat resistant fiber constitutes 20% to 25% of the total weight of the core spun yarn, and the coated yarn of the fiber having excellent strength, touch feeling, and dimensional stability is 80% to 75% of the total weight of the core spun yarn. Core spun yarn for the manufacture of safety clothing, characterized in that the configuration. The core spun yarn according to claim 1, wherein the coated yarn is selected from cotton, wool, polyester fiber, modacryl fiber, other synthetic fiber, rayon fiber, or a blend thereof. The corespun yarn of claim 1, wherein the coated yarn comprises lyocell fibers.

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