KR101011722B1 - Aramid Fabric Having Superb Elasticity And Good Touch - Google Patents

Abstract

The present invention relates to an aramid fabric having excellent elasticity and feel, and has excellent elasticity and feel, characterized by being woven using one or both of warp and weft aramid covering yarns composed of polyurethane filament and screening yarn aramid spun yarn. Relates to aramid fabric.

Aramid, Polyurethane, Covering

Description

Aramid Fabric Having Superb Elasticity And Good Touch}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an aramid fabric having excellent elasticity and feel. The present invention relates to a fabric having excellent elasticity and excellent touch by adding elasticity to a meta-aramid, which is a heat resistant fiber, and particularly to an aramid fabric that can be usefully used for a protective garment fabric. .

Aramid is a general term for Aromatic Polyamide fiber, which is composed of synthetic fibers of long chain-like synthetic polyamide, and at least 85% of amide bonds are directly attached to two aromatic rings. It is defined. Aramid is a nylon-based polymer used in the form of fibers.

Since the invention of polyamide and polyester, for half a century, fibers and plastics have been improved in strength, and have been developed for the purpose of improving performance by increasing heat resistance. Synthetically, the wholly aromatic polyamide and polyester which introduced the aromatic nucleus into the main chain were attracted as a rigid molecule, but were unable to spin because there was no solvent to dissolve it. However, in 1965, the aromatic polyamide (-NH-C ₆ H ₄ -NH-CO-C ₆ H ₄ -CO-) was dissolved in concentrated sulfuric acid by Stephanie Kwolek and Herbert Blades of the DuPont Laboratories. When it extruded from a nozzle, it discovered that a molecular chain solidified in the state orientated to the fiber axis direction, and turns into a fiber. It was then produced in 1971 by DuPont under the name Kevlar.

Aramid fiber, developed by DuPont, is a polymer synthesized by low-temperature polymerization of p -phenylenediamine with terephthalic acid chloride and is called poly- p -phenylene terephthalamide (PPTA). Sufficient crystal orientation when radiating this PPTA in a method called wet-wet spinning method (with a space of approximately 1 cm between the nozzle and the coagulation bath and a larger difference between the velocity drawn from this space and the discharge line velocity). To have. Thus, the amide group is trans-coordinated to form a fully extended molecular ring, and the amide group has a structure in which hydrogen bonds are formed with the amide groups of adjacent molecular rings. If the fiber in the spun state is kept at about 820 K in a nitrogen atmosphere for a long time, the crystallization proceeds and the orientation becomes better, and the strength hardly changes, but the elastic modulus doubles. It is commercialized as Kevlar.

It is also commercialized under the trade name Nomex by polycondensing aromatic diamines and aromatic diacid chlorides. In addition, a polyaromatic etheramide was developed in Teijin by reacting terephthalic acid chloride with p -phenylenediamine and 34'-diaminophenyl ether to make a polymer, wet spinning and then stretching it to orient crystals.

Aramid fibers are classified into para-like aramid fibers and meta-like aramid fibers according to the bonding position of the amide group and the benzene ring as described above, and the para-aramid is composed of polymer and co-polymer. The para system is characterized by high strength and high modulus of elasticity, and the meta system is characterized by excellent thermal stability.

Among these, meta-aramid is a fiber made of a polymer in which a benzene ring is connected to an amide group in the meta position. It has a melting point of 320 ° C, which is excellent in heat resistance, flame retardancy, and flame resistance. It is also used for general consumers such as pajamas, partition curtains, pillows, and work clothes. Trade names include DuPont Nomex, Teijin Gonex and Russian Penilon.

Meta-Aramid fiber has been widely used in protective clothing such as fire fighting suits because of its excellent heat resistance, flame retardancy, chemical resistance, and radiation resistance, but due to its strong molecular structure and high crystalline dense structure, it has many elasticity. There was a problem that was restricted.

As a result of research to improve the problems of such aramid fabric, Korean Patent Publication No. 10-2006-98375 discloses one or more single yarns having a sheath / core configuration in which the sheath includes cut resistant short fibers and the core includes inorganic fibers; And a twisted yarn and a woven fabric for use in a cut resistant fabric, the cut resistant fiber comprising at least one single yarn and at least one continuous elastic filament, free or substantially free of inorganic fibers. The use of inorganic fibers such as steel fibers still has the problem of deterioration of touch and elasticity.

Therefore, the present invention is to solve the problem of lowering the touch and elasticity due to the characteristic of aramid in the fabric using aramid fiber as a technical problem.

Therefore, according to the present invention, there is provided an aramid fabric having excellent elasticity and feel, characterized by being woven using any or all of the aramid covering yarn made of the yarn filament and the yarn aramid spinning yarn covering yarn.

Hereinafter, the present invention will be described in more detail.

The present invention relates to aramid fabric that can be used not only for firefighting and industrial, but also for leisure goods, interior and aviation by imparting excellent elasticity and feel to aramid fiber which is a high strength and high heat resistant fiber material.

The aramid fabric of the present invention is woven using either or both of warp yarns and weft yarns using aramid covering yarns consisting of a polyurethane filament of the yarn and an aramid spinning yarn of the covering yarn. Weaving conditions may be weaving by using both the aramid covering yarn as warp or weft yarn in an air jet or rapier loom, or using any one of the warp or weft yarn using only the aramid covering yarn and the remainder is a yarn made of only aramid.

In the present invention, the aramid covering yarn using the hollow spin described in Figure 1 by using an aramid spun yarn of the effect yarn around the screening of polyurethane filament stretched by a draft ratio of 2.5 to 3.5 times while using a T / M 400 ~ 1000 Although the polyurethane filament used as the screening may serve to give high elongation and elastic recovery rate, general polyurethane filament may be used, and more preferably, elongation of 200% or more. Although the fineness of about 40 denier is preferable, it does not specifically limit the fineness of a core yarn.

Aramid spun yarn, which is an effect yarn, is preferably spun yarn with 20 to 50 spun yarns. Aramid yarn can use either meta or para system.

Covering the polyurethane filament from the take-up bobbin (1) to the second feed roller (5) at a speed of 10-20 m / min through the hollow spindle (4) of the first feed roller (2) and the effector winding spool (3). At the same time as the draft rate is stretched 2.5 to 3.5 times to supply the screening, the combustible aramid spun yarn wound on the effector winding spool 3 is passed from the winding spool 3 to the second roller through the guide roller 7. Supply by).

At this time, since the effector winding spool 3 rotates by 20,000 to 30,000 RPM by a separate driving device, the effector wraps the screening in the section from the effector winding spool 3 to the second supply roller 5 and the winding bobbin ( It is wound up to 6) and the aramid covering yarn is manufactured. In the covering process, the density of the effect yarn per 1 m of covering yarn, that is, the covering density (hereinafter referred to as T / M) should be 400 to 1000. If the T / M is less than 400, the workability is poor and the effector is judged. Insufficient wrapping will result in streaking on the final fabric and difficulty in developing tensile strength.If the T / M exceeds 1000, the twist of the filament will cause excessive twisting of the filament yarns. .

The aramid covering yarn of the present invention is preferably 3 to 5g / den and 20 to 30% elongation to express the excellent tensile strength, elongation and elastic recovery of the aramid fabric to be produced.

The aramid fabric of the present invention is mainly used as a warp or weft yarn of 30 to 50 aramid covering yarns to form an arbitrary structure, such as plain weave, twill weave, has a basis weight of 4.0oz / yd ² to 10oz / yd ² , Warp tensile strength 750 ~ 1,000N, weft tensile strength 450 ~ 650N, warp elongation 35 ~ 42%, weft direction elongation 62 ~ 75%, warp direction elastic recovery 85 ~ 98%, weft direction elastic recovery 94 ~ 98% It is excellent in tensile strength, excellent in elongation and elastic recovery rate, and excellent in touch.

Therefore, the aramid fabric according to the present invention has excellent tensile strength, excellent elongation and elastic recovery rate as well as excellent touch by using aramid covering yarn manufactured by a simple method without using a complicated method such as air texturing. It can be used for a wide range of applications, not only for industrial use but also for leisure, interior and aviation.

The following examples are given as non-limiting examples of the method for providing the aramid fabric of the present invention.

Example 1

 Supply 40 denier polyurethane filament as screening, and supply meta-aramid bi-ply twisted yarn which is combined to have s-yeon with T / M 600 ~ 900 as spun yarn with 30 ~ 50 fineness to effect yarn by supplying polyurethane with hollow spins Aramid covering yarn (40'S) was produced by covering the aramid yarn, which is an effect yarn, with a T / M 700 while stretching the draft rate three times around the filament screening.

 The obtained aramid covering yarn was supplied at an inclination, and the fabric was woven by supplying a yarn composed of only aramid (40'S) to the air jet loom with a weft yarn.

Physical property test of the obtained fabric is shown in Table 1 by the following method.

※ Property Test Method

1. Tensile strength, elongation: KS K 0520: 2004 Grab method C.R.E TYPE.

2. Elastic recovery rate: KS K 0541 method.

3. Fabric Measurement: The passive properties of the fabric were measured using the Kawabata Measurement System (KES). KES is described in Kawabata, S. "The Standardizastion and Analysis of Hand Evaluation", Japan Textile Machinery Association, June 1980, 2nd edition, Osaka, Japan and published in Kyoto, Japan. A method of measuring the mechanical and surface properties of fabrics using a highly sensitive instrument set manufactured by Kato tekko Co., Ltd.

division

The tensile strength
(N)

Shindo
(%)

Elastic recovery
(%) Textile condition measurement KOSHI ^{1 )}
(stiffness) SHARI ^{2 )}
(crimpness) FUKURAMI ^{3 )}
(fullness & softness) THV ^{4 )}
(General state) Example 1
slope Weft slope Weft slope Weft 6.97
0.88
13.97
8.09
914.16 591.33 45.8 105.9 90 98

Week 1,2,3) 1: week, 10: strong

Note 4) 1: poor, 5: excellent

As shown in Table 1, the aramid fabric is not only excellent in tensile strength but also high in elongation and elastic recovery rate, and excellent in activity when worn.

1 is a schematic diagram of a process for producing an aramid covering yarn used in the aramid fabric of the present invention.

[Description of Drawings]

1: winding bobbin 2: 1st supply roller

3: effector winding spool 4: hollow spindle

5: 2nd supply roller 6: winding bobbin

7: guide roller

Claims (5)

In the aramid fabric woven by using either or both of the warp and weft yarn aramid covering yarn consisting of the polyurethane filament of the screening and the aramid spinning yarn of the covering yarn, The aramid covering yarn is a spun yarn of 30 to 50 degrees of fineness around the screening of polyurethane filament using hollow spins, and the aramid spinning yarn is a double-bonded twisted yarn aramid spun yarn that is combined to have s yeon as T / M 600 ~ 900 2.5 Aramid fabric with excellent elasticity and feel, characterized by covering at T / M 400 ~ 1,000 while stretching at ~ 3.5 times. delete delete delete delete

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