JP2007009378A - Cut-resistant fiber products - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a high-performance textile product having sufficient cut resistance to prevent the cut trouble caused by a metal piece or a sharp blade, exhibiting excellent stretchability, flexibility and comfortableness, and fitting to the body to enable smooth muscular motion. <P>SOLUTION: The textile product is composed of different kinds of covering yarns A and B produced by using an elastic fiber as the core yarn and a crimped high-performance filament yarn as the sheath yarn wound around the core yarn. The sheath yarn of the covering yarn A is twisted in the direction the same as the false twist direction, the sheath yarn of the covering yarn B is twisted in the direction reverse to the false twist direction, the ratio of the covering yarn A is 80-0% and that of the covering yarn B is 20-100%. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a textile product excellent in cut resistance, stretchability and flexibility.

  General-purpose thermoplastic synthetic fibers such as nylon and polyester fibers, which are widely used as clothing and industrial materials, are flexible and comfortable clothing fibers, but they are easily cut by cutlery and shearing stress, and are torn or worn. Easy to open. Therefore, these general-purpose thermoplastic synthetic fibers are used for clothing products used in situations where the person's body is likely to be at risk, such as fire-fighting clothes, racing suits, iron-working or welding work clothes, and work gloves. It is not suitable as a protective fiber material.

  On the other hand, glass fiber, ceramic fiber and metal fiber obtained from a hard material are materials having excellent cutting resistance, but have low bending resistance (flexibility) and lack light weight. Further, there is a risk that the free end of the filament may pierce the body of the operator or user, and this is not suitable as a protective fiber material.

  General-purpose thermoplastic synthetic fibers such as nylon and polyester fibers melt at around 250 ° C, whereas high-performance fibers such as aramid fibers, wholly aromatic polyester fibers, or polyparaphenylene benzobisoxazole (PBO) fibers are about It does not melt at around 250 ° C., and its decomposition temperature is as high as about 500 ° C. Further, the critical oxygen index of the non-heat-resistant general-purpose fiber nylon or polyester fiber is about 20 and burns well in the air, whereas the high-performance fiber has a critical oxygen index of about 25 or more. However, in the air, it is burned by bringing the flame, which is a heat source, closer, but if the flame is moved away, the combustion cannot be continued.

  As described above, the high-performance fiber is generally a material excellent in heat resistance and flame retardancy. Therefore, for example, aramid fiber, which is a heat-resistant and high-performance fiber, is a clothing product in a scene with a high risk of exposure to flames or high heat, such as fire fighting clothes, racing suits for automobile racing, iron work clothes or welding work clothes and It is used favorably as protective clothing such as gloves. Above all, para-aramid fibers, which have both high heat resistance and heat resistance, are used in sports clothing, work clothes, ropes, tire cords, etc. that require tear strength and heat resistance, and because they are difficult to cut with a knife, they are wounded. It is also used for work gloves for prevention.

  However, when manufacturing textile products such as clothing products using these high-performance fibers, the fibers are only used in the form of non-stretchable filament yarns and spun yarns. However, even if a non-stretchable yarn such as a filament yarn or a spun yarn is processed into a fabric to produce a clothing product such as a fire fighting suit, a racing suit, or a workwear, the clothing product has poor stretchability. When the garment product is worn, the comfort is poor and the motor functionality is inferior. Similarly, conventional work gloves made from non-stretchable yarns have a poor feeling of wear and have been a cause of reduced work efficiency.

  In view of such market demand, a heat-resistant crimped yarn made of heat-resistant and high-performance fibers such as aramid fiber has been proposed (Patent Document 1). With the appearance of such crimped yarns, not only has excellent heat resistance, flame retardancy and high strength properties, but also has good stretch elongation and stretch elasticity and excellent appearance, and fluff and dust are generated. A difficult thread was obtained. As an application example of the crimped yarn, Patent Documents 2 to 3 disclose a covering yarn using an elastic fiber as a core yarn and an aramid filament crimped yarn as a sheath yarn, and a knitted fabric and protective clothing using the covering yarn Is disclosed.

On the other hand, a cut-resistant glove made of a woven or knitted fabric using a high-strength and high-modulus bulky yarn (Patent Document 4), or a fabric made of organic fiber yarns using fibers having a high-strength and high tensile modulus A cut-resistant glove (Patent Document 5) using a fabric having a basis weight of 200 to 1000 g / m ² and a fabric of LEVEL 3 or higher in the test method of BS EN388 6.2 has been proposed.
JP 2001-248027 A JP 2003-193345 A JP 2003-193314 A JP 2001-303324 A JP 2005-42240 A

  However, the fiber products made of covering yarn disclosed in Patent Documents 2 to 3 have improved stretchability, heat resistance, strength, fit, and the like compared to conventional aramid fiber products, but they are cut resistant. Is not enough.

  The cut resistant glove made of a woven or knitted fabric using a high-strength and high-modulus bulky yarn disclosed in Patent Document 4 uses a polyurethane elastic yarn as a core yarn, but an ultrahigh molecular weight polyethylene as a sheath yarn. Since processed yarns of fibers and polyester filaments are used, it is difficult to obtain sufficient cut resistance.

  The covering yarn described in Patent Document 5 uses ultra-high molecular weight polyethylene fiber or nylon fiber as the core yarn, uses polyethylene terephthalate fiber or PBO fiber as the sheath yarn, and combines high-strength fiber and general-purpose fiber. It gives stretch and fit to clothing. For this reason, the stretchability is insufficient, and the covering thread alone cannot provide sufficient cut resistance. Therefore, two knitted fabrics formed from the covering thread are stacked, or a PBO fiber fabric is used as a base. It is necessary to use it by laminating. Therefore, there is a drawback that the garment is inferior in flexibility and fit.

  As described above, none of the above-described textile products has been obtained with a textile product having both cut resistance and stretchability, and further comfort such as flexibility and fit.

  The present invention has been made in view of the background of such prior art, and has cutting resistance sufficient to prevent a cutting accident caused by a metal piece or a sharp blade, and has elasticity, flexibility, and comfort. The purpose is to provide a high-performance fiber product that is excellent in performance, fits well to the body and has excellent motor functionality.

  As a result of intensive studies to solve such problems, the present inventors have used elastic fibers as the core yarn, crimped high-performance filament yarns as the sheath yarn, and twisted sheath yarn that winds the core yarn. The covering yarn B having a direction opposite to the twisting direction of the false twisting of the sheath yarn alone or a method of winding the sheath yarn in which the covering yarn B and the core yarn are wound is a false twisting of the sheath yarn. By using together the covering yarn A that is the same as the twisted direction of processing, there is no need for lamination with other high-strength fabrics, etc., and fiber that has dramatically improved cut resistance while maintaining its own elasticity The inventors have found that a product can be obtained and have reached the present invention.

  That is, the present invention uses only different types of covering yarn A and covering yarn B, or covering yarn B using an elastic fiber as a core yarn and a crimped yarn of a highly functional filament yarn as a sheath yarn for winding the core fiber. The covering yarn A has a sheath yarn twisted in a positive direction and a twist direction of the false twisting process, and the covering yarn B has a sheath yarn that has been subjected to false twisting process. A fiber product characterized by being twisted in a direction opposite to the twisting direction is provided.

  According to the present invention, in addition to cut resistance, stretchability, and flexibility, the product is excellent in mechanical strength, fits well with the body, has excellent exercise functionality, and does not generate fluff or dust. Can be provided. By wearing the clothing made of the textile product of the present invention, it becomes possible to avoid cut accidents caused by metal pieces or sharp blades.

  The textile product of the present invention uses different types of covering yarn A and covering yarn B, or covering yarn B, which uses an elastic fiber as a core yarn and a crimped yarn of a high-function filament yarn as a sheath yarn that winds the elastic fiber. The covering yarn A is a sheath yarn in which the sheath yarn is twisted in the positive twisting direction and the positive direction, and the covering yarn B is a sheath yarn in which the false twisting is applied. It is twisted in the direction opposite to the twisting direction.

  That is, when using an elastic fiber as a core yarn and using a crimped yarn of a high-function, high-modulus high-performance filament yarn as a sheath yarn, a highly stretchable and high-functional covering yarn can be provided. Providing a textile product having a high level of cut resistance by forming a knitted fabric by including a covering yarn B in which the twisting direction of the sheath yarn is opposite to the twisting direction of false twisting. it can. That is, the false twisted yarn has torque in its twisting direction (the degree is expressed by the number of residual torque twists), and the sheath yarn twisted in the direction to cancel the torque is put into the knitted fabric. In addition, an effect of improving cut resistance is exhibited. In addition, it means that torque is so large that a residual twist number is large.

  In the present invention, the covering yarn A has (A-1) the twisting direction of false twisting is S, the twisting direction of covering is S, or (A-2) the twisting direction of false twisting is Z. And the thing of the twist direction of covering Z is used. On the other hand, in the covering yarn B, (B-1) the twisting direction of false twisting is S, the twisting direction of covering is Z, or (B-2) the twisting direction of false twisting is Z, A cover having a twisting direction of S is used. In the textile product of the present invention, any combination of the covering yarns A and B, or the covering yarn B may be used alone or in combination.

  Hereinafter, the textile product of the present invention will be described with reference to the drawings.

  FIG. 1 is a schematic side view showing an example of a covering yarn used in the textile product of the present invention. In this figure, the covering yarn (c) is wound around the elastic fiber (a), which is the core yarn, and is wound in a single or double manner by the crimped yarn (b) of the high-performance filament yarn, which is the sheath yarn. It is what.

  The sheath yarn to be wound is one that has been Z-twisted (or S-twisted) by false twisting. In the covering yarn A, a Z-twisted (or S-twisted) sheath yarn (B) is wound around the core yarn (A). On the other hand, in the covering yarn B, the sheath yarn (B) of S twist (or Z twist) is wound around the core yarn (A).

  The core yarn in the covering yarns A and B used in the textile product of the present invention is an elastic fiber. Of these, polyurethane elastic fibers having high stretchability, particularly urethane spandex are preferably used.

  As the polyurethane-based elastic fibers, those obtained by spinning a polyurethane polymer obtained by reacting an isocyanate mainly composed of a polymer diol and an organic diisocyanate with a polyfunctional active hydrogen compound are preferably used.

  Examples of the polymer diol include polyether glycols such as polytetramethylene glycol, polyethylene glycol, and propylene ether glycol, glycols such as ethylene glycol, 1,6-hexanediol, 1,4-butanediol, and neopentyl glycol. Polyester glycols, polycaprolactone glycol, polyhexamethylene dicarbonate glycol obtained by reacting at least one kind with dicarboxylic acid such as adipic acid, suberic acid, azelaic acid, sebacic acid, β-methyladipic acid, isophthalic acid, etc. One kind or a mixture or copolymer of two or more kinds of polymer diols such as are used.

  Examples of the organic diisocyanate include 4,4′-diphenylmethane diisocyanate, 1,5-naphthalene diisocyanate, 1,4-phenylene diisocyanate, 2,4-tolylene diisocyanate, hexamethylene diisocyanate, 1,4-cyclohexane diisocyanate, 4 One or a mixture of two or more organic diisocyanates such as 4,4'-dicyclohexylmethane diisocyanate and isophorone diisocyanate are used. In this case, a small amount of triisocyanate may be used in combination.

  Examples of the polyfunctional active hydrogen compound include ethylenediamine, 1,2-propylenediamine, hexamethylenediamine, xylylenediamine, 4,4′-diphenylmethanediamine, hydrazine, 1,4-diaminopiperazine, ethylene glycol, 1, One kind of 4-butanediol, 1,6-hexanediol, water, or a mixture of two or more of these is used.

  These compounds may be used in combination with a small amount of a terminator such as monoamine or monoalcohol, if desired. Also, antioxidants such as 2,6-ditetrabutylparacresol and phosphites, light absorbers or ultraviolet absorbers such as hydroxybenzophenone or hydroxybenzothiazole, 1,1-dialkyl-substituted semicarbazides, dithiocarbamates Gas yellowing and deterioration inhibitors such as, and white pigments such as titanium oxide and zinc oxide may be appropriately blended.

  The fineness of the polyurethane elastic fiber is preferably in the range of 11 to 940 dtex (hereinafter referred to as dtex), and more preferably in the range of 22 to 310 dtex. If it is less than 11 dtex, it may cause thread breakage in covering, knitting, and weaving processes, and when clothing is formed, it is not possible to obtain a product that has sufficient fit when worn. On the other hand, if it exceeds 940 dtex, it has high rigidity and is not suitable for clothing that requires flexibility.

  Further, the breaking elongation is preferably 300% or more. When the elongation at break is less than 300%, sufficient stretchability cannot be obtained when the fabric is formed.

  The cross-sectional shape of the polyurethane-based elastic fiber is not particularly limited, and may be circular or flat.

  The sheath yarn in the covering yarns A and B used in the textile product of the present invention is a crimped yarn of high-performance filament yarn having high strength and high elastic modulus. As such a high function filament yarn, a high tensile property that the tensile strength measured based on JIS L 1013 is 10 cN / dtex or more, preferably 15 cN / dtex or more, and a tensile elastic modulus measured based on JIS L 1013. A fiber satisfying a high modulus of elasticity of 400 cN / dtex or more is preferably used. By using a highly functional filament yarn having a tensile strength of 10 cN / dtex or more and a tensile modulus of 400 cN / dtex, a high degree of bending resistance and wear resistance can be imparted to the covering yarn.

  Examples of the material constituting the high-performance filament yarn include aramid fibers, wholly aromatic polyester fibers (for example, Kuraray Co., Ltd., trade name “Vectran”), polyparaphenylene benzobisoxazole fibers (for example, Toyobo Co., Ltd., trade names) “Zylon”), polybenzimidazole fiber, polyamideimide fiber (for example, Rhône-Poulenc, trade name “Kelmer”), ultrahigh molecular weight polyethylene fiber (for example, Toyobo Co., Ltd., trade name “Dyneema”), LCP (liquid crystal polymer) ) Fibers are preferably used. Among these fibers, an aramid fiber is particularly preferably used because it has excellent cut resistance.

  Examples of the aramid fibers include meta-aramid fibers and para-aramid fibers. Examples of the meta-aramid fibers include meta-total aroma such as polymetaphenylene isophthalamide fiber (manufactured by DuPont, trade name “NOMEX”). Group polyamide fibers are used. Examples of the para-aramid fiber include polyparaphenylene terephthalamide fiber (trade name “Kevlar” manufactured by Toray DuPont Co., Ltd.) and copolyparaphenylene-3,4′-diphenyl ether terephthalamide fiber (manufactured by Teijin Limited). Para-type wholly aromatic polyamide fibers such as “Technola”) are used. Among these, para-aramid fibers are particularly preferably used because they are excellent in cut resistance and heat resistance as well as high strength characteristics and high elastic modulus.

  The crimped yarn of the high-performance filament yarn is preferably a crimped yarn obtained by subjecting the high-performance filament yarn to false twisting from the viewpoint that the texture when forming the knitted fabric is soft and further excellent in stretchability. used. Crimped yarns are not twisted (tempered → heat set → untwisted) until twisted, heat set only, false twisted yarn twisted, false twisted yarn A set or a twisted yarn may be false twisted.

  As a method for imparting crimp to such a high-performance filament yarn, for example, as disclosed in Japanese Patent Application Laid-Open No. 2001-248027, the high-function filament yarn has a twist coefficient (K) represented by the following formula (1). Add 16,000 to 35,000 twist, then perform high-temperature high-pressure steam or high-temperature high-pressure water treatment at 130 to 250 ° C to fix the twist, and untwist the twisted yarn in the opposite direction. There is a way to do it.

K = t × D ^1/2 (1)
[However, t represents the number of twists (times / m), and D represents the fineness (dtex). ]

  Para-aramid fiber filament crimped yarn can also be obtained by the following method. That is, a twist of a twist coefficient (K) of 16,000 to 35,000 represented by the following formula (2) is added to the para-aramid fiber yarn, and then dried using a method such as heating in the air. Thus, after fixing the twist, the twisted yarn with the fixed twist is untwisted in the opposite direction. At this time, as the para-based aramid fibers, those having a moisture content of preferably 15% or more, more preferably 25% or more, and particularly preferably 30 to 100% may be used. If the moisture content before twisting the para-aramid fiber is less than 15%, a good twist setting effect cannot be obtained. On the other hand, if the moisture content before twisting exceeds 100%, a ring twisting machine or double When twisting with a twister, water is scattered from the yarn by centrifugal force and the twisting machine is submerged in water, which hinders the environment and workability.

K = t × Dw ^1/2 (2)
[However, t represents the number of twists (times / m), and Dw represents the fineness (dtex) including moisture. ]

  In this method, twisting-drying (twist fixing) -untwisting may be performed in separate steps, or may be performed continuously as in, for example, a false twisting method.

  The stretch recovery rate of such highly functional filament crimped yarn is desirably 4 to 80%. When the expansion / contraction restoration rate is less than 4%, the soft feeling is inferior when the knitted fabric is formed, and when it is 80% or more, the harmony with the polyurethane elastic fiber is poor and the appearance of the covering yarn is not preferable. . The residual torque twist number is preferably 20 times / m or more.

  The highly functional filament yarn according to the present invention may be composed of one kind of the above highly functional filament thread, or may be composed of any two or more kinds of the above highly functional filament thread. In addition, it can be used as a composite yarn by blending with other known fibers such as polyester, nylon, polyvinyl alcohol fiber, and twisting as long as the effects of the present invention are not impaired.

  The fineness and the number of filaments of the high-performance filament yarn may be appropriately selected in consideration of cut resistance, stretchability, flexibility, texture and the like according to the purpose of use.

  The fineness of the sheath yarn is preferably in the range of 20 dtex or more and 1600 dtex or less depending on the purpose of use.

  Furthermore, the single yarn fineness of the sheath yarn is preferably in the range of 0.1 dtex to 10 dtex, more preferably 0.4 dtex to 5 dtex, depending on the application. If it is 0.1 dtex or less, the yarn-making efficiency is low and the cost is increased, and if it is 10 dtex or more, the rigidity is high and it is not suitable for clothing that requires flexibility.

  The covering yarn used in the present invention may be one in which the sheath yarn is single-coated around the core yarn from the viewpoint of obtaining excellent stretchability, and the sheath yarn is the core yarn from the viewpoint of obtaining excellent covering properties. It may be one in which the surroundings of doubly coated.

  Next, the manufacturing method of the covering yarn used by this invention is demonstrated. FIG. 2 is a schematic diagram showing an example of a method for producing a covering yarn used in the present invention.

  In the present invention, the elastic fiber is used as the core yarn, and the crimped yarn of the high-function filament yarn is used as the sheath yarn, and the covering yarn A is added in the same direction as the twisting direction of false twisting. The covering yarn B is coated so that the sheath yarn is twisted in a direction opposite to the twisting direction of the false twisting process.

  In the case of coating, a commercially available covering machine or the like is preferably used.

  FIG. 2 shows an example of double coating. In FIG. 2, the elastic fiber used as the core yarn 1 is positively fed by the rolling yarn feeding roller 3 and is 1.2 to 2.4 with the feed roller 4. It is preferable to pre-draft within the range and set the draft between the rolling yarn feeding roller 3 and the delivery roller 11 to be in the range of 2.4 to 4.0.

  The sheath yarn is wound around the H bobbin 2 by a commercially available high-speed winder, and then installed on the lower spindle 5 and the upper spindle 7 as shown in FIG. 2, and is wound around the core yarn by rotating the spindle. Form.

  The obtained covering yarn is wound around the cheese 14 by the take-up roller 13.

  When manufacturing a single covering yarn, one H bobbin is installed on either the upper or lower spindle, and the sheath yarn is wound around the core yarn by rotating the spindle.

  When the sheath yarn is coated on the core yarn, the number of twists of the sheath yarn may be appropriately selected depending on the count of the sheath yarn, but is preferably in the range of 100 to 2000 times / m.

  In addition, in the case of double coating, the upper twist is preferably the direction opposite to the lower twist from the viewpoint of canceling the torque of the lower twist, and from the same viewpoint, the number of twists of the upper twist is the lower twist. The twist number is preferably 0.7 to 0.9 times the twist number.

  The high-performance filament yarn having high stretchability and cut resistance, which is the covering yarn of the present invention, is processed into a knitted fabric or a woven fabric by an ordinary method and is useful for the following textile products. For example, it is suitable for work clothing that protects the human body from protrusions and sharp debris, as well as clothing materials for various sports and outdoor activities, and used as the outer and / or lining, middle or underwear of these clothing Can do. Specifically, for example, there are various racing wear, various gloves and socks, an apron, an arm cover, spats, a balaclava and the like.

  The textile product according to the present invention may use only the covering yarn B or a combination of covering yarns A and B. That is, it is preferable that the covering yarn A is composed of 80 to 0% and the covering yarn B is composed of 20 to 100%. By making the textile including the covering yarn B within the above range, it is possible to obtain a textile having a high level of cut resistance which is the object of the present invention. Further, when a knitted fabric is produced by combining different types of covering yarns A and B, the combination arrangement method is arbitrary, as long as the covering yarn B exists in a moderately dispersed manner in the knitted fabric. .

  In addition, since the fiber product of the present invention is composed of covering yarn made of filament yarn, unlike spun yarn products that generate fluff and dust, clean rooms where fluff and dust are problematic, assembly work of precision equipment, etc. It is also useful for work clothes and protective clothing.

  Furthermore, it is also useful as a resin reinforcement, by processing high-performance filament yarn with high stretchability and cut resistance into knitted fabric and woven fabric, impregnating it with elastomer, or pasting and adhering to elastomer, A film material having stretchability or stretchability and cut resistance can be obtained. For example, it is useful as a reinforcing material for a film material using an elastomer such as trains and automobiles. Specific examples include train cars, vehicle-connected hoods, and removable hoods.

  Since the knitted fabric and woven fabric according to the present invention are stretchable and easily follow uneven surfaces, a reinforcing cloth (covering cloth) disposed on the tooth surface to prevent wear on the tooth surface of the timing belt, etc. It is also useful as a reinforcing material for industrial rubber products. It is also useful as a reinforcing material for buildings and structures. For example, train viaduct pillars, building pillars, road floors and the like are reinforced with resin and high-strength fibers. When the reinforcing surface has irregularities, high-performance filament woven fabric without elasticity has been used in the past, but because it does not adhere to the irregular surface, an air layer or resin pool was formed, which caused the reinforcing effect to be reduced . When the knitted fabric or woven fabric made of heat-resistant and highly functional filament yarn having high stretchability according to the present invention is used as a fiber reinforcing material in such reinforcement, it closely adheres to the uneven surface of the reinforcing part such as a building or a structure. Therefore, an air layer and a resin pool are not generated.

  The knitted fabric referred to in the present invention means fabrics and string-like products made from yarns such as woven fabrics, knitted fabrics, braided braids, ropes, and the like.

  Hereinafter, the present invention will be described more specifically with reference to Examples and Comparative Examples, but the present invention is not limited to only the following Examples. In addition, the measuring method of each characteristic value in the following examples and comparative examples is as follows.

[Cut resistance]
Evaluation was performed in accordance with the test method of British Standard BS EN388. The evaluation device was run while rotating the circular blade on the test sample in the direction opposite to the running direction, cutting the test sample, and measuring the count value until the blade penetrated the test sample. A cotton canvas fabric having a basis weight of 540 g / m ² was used as a blank, and cut LEVEL with the test sample was evaluated.
Start the test from the cotton canvas fabric, measure the count value alternately between the cotton canvas fabric and the test sample, and when you finish measuring the count value for 5 test samples, finally the 6th time of the cotton canvas fabric The count value was measured, one test was completed, and one index value was calculated. All test samples were set free.
The Index value is calculated by the following equation.
Index value = (sample count value + A) / A
A = (count value of cotton cloth before sample test + count value of cotton cloth after sample test) / 2

[Tensile strength]
Measured according to JIS L 1013: 1999 Chemical Fiber Filament Yarn Test Method 8.5.1.
[Tensile modulus]
Measured according to JIS L 1013: 1999 chemical fiber filament yarn test method 8.10.

[Expansion and restoration rate]
Measured according to JIS L 1013: 1999 chemical fiber filament yarn test method 8.12.

[Number of residual torque twists]
A load of 4.4 cN is hung on the sample, and after marking a distance of 1 m in the yarn length direction, the sample is fixed in the lateral direction. Next, the load W ₁ of 0.13 cN is hung at the center (50 cm) at the interval of 1 m, and the both ends of the sample are aligned at the center as shown in FIG. 3, and the rotational speed N until the sample rotates and stops is measured. Read with a machine. The read rotation speed N is doubled to obtain the residual torque twist number (times / m).

(Examples 1-4)
[Manufacture of covering yarn A]
Double twister with polyparaphenylene terephthalamide fiber filament yarn 220 dtex (trade name “Kevlar”, single yarn fineness 1.65 dtex, tensile strength 20.3 cN / dtex, tensile modulus 499 cN / dtex) manufactured by Toray DuPont Co., Ltd. Z twist was added to obtain a twisted yarn having a twist number of 1685 (times / m).

  The twist coefficient at this time is represented by the above formula (1), and K = 25000.

  This was put into a saturated steam treatment facility, and a saturated steam treatment at 200 ° C. was performed for 15 minutes to perform twist setting. After cooling, a double twist was applied in the reverse direction to untwist the number of twists to almost 0 to obtain a crimped yarn. The obtained crimped yarn had an expansion / contraction recovery rate of 9.6% and a residual torque twist number of 96.4 turns / m.

  44 dtex polyurethane elastic fiber (manufactured by Operontex Co., Ltd., trade name “Lycra”) is used as a core yarn, and the obtained 220 dtex polyparaphenylene terephthalamide fiber filament crimped yarn is used as a sheath yarn. Using the covering process shown in 2, the covering process was performed under the following conditions.

Draft: 3.0 times the number of twists: Z400 times / m
Spindle speed: 5000rpm
Winding ratio: 96.0%

[Manufacture of covering yarn B]
44 dtex polyurethane elastic fiber (trade name “Lycra” manufactured by Operontex Co., Ltd.) is used as the core yarn, and the crimped yarn of the polyparaphenylene terephthalamide fiber filament used in the production of the covering yarn A is used as the sheath yarn. The covering process was performed under the following conditions using the covering step shown in FIG.

Draft: 3.0 times twist: S400 times / m
Spindle speed: 5000rpm
Winding ratio: 96.0%

The obtained single covering yarn A and single covering yarn B were knitted in a circular knitting structure using a knitting machine having a hook diameter of 30 inches under the following knitting conditions at the mixing ratio shown in Table 1. The covering yarn was arranged as shown in Table 1.
(Knitting conditions)
-Knitting machine used: 16 gauge x 30 inch hook diameter-Knitting structure: Smooth-Yarn speed: 68.5 m / min-Tension: approx. 4 g / piece-Number of yarns supplied: 20-Number of rotations: 11 rpm
-Widening: 72cm

(Comparative Example 1)
A circular knitted structure was knitted by the same method as in Example 1 except that only the covering yarn A was used.

  Table 1 summarizes the properties and properties of the fabrics obtained in the examples and comparative examples.

  As is apparent from Table 1, the knitted fabric of the present invention example using the covering yarn B has good cut resistance, whereas the knitted fabric of the comparative example 1 not using the covering yarn B is cut resistant. The creativity was inferior.

It is a schematic side view which shows an example of covering yarn A and B used by this invention. It is a schematic diagram which shows an example of the manufacturing method of the covering yarn used by this invention. It is explanatory drawing of the test method of residual torque twist number.

Explanation of symbols

 A: Covering yarn A, B: Covering yarn B, (I): Core yarn, (B) Sheath yarn, (C): Covering yarn

1: core yarn 2: sheath yarn 3: rolling yarn feeding roller 4: feed roller 5: lower spindle 6: lower belt 7: upper spindle 8: upper belt 9: H bobbin 10: snell guide 11: delivery roller 12: guide bar 13 : Take-up roller 14: Cheese

Claims (6)

It is a fiber product composed of different types of covering yarns A and B, or a covering yarn B using a high-performance filament yarn crimped yarn as an elastic fiber for the core yarn and a sheath yarn for winding it. In the covering yarn A, the sheath yarn is twisted in the positive direction and the twisting direction of the false twisting process, and the covering yarn B is twisted in the direction opposite to the twisting direction of the false twisting process. Textile products characterized by being. The high-performance filament yarn has a tensile strength measured based on JIS L 1013 of 10 cN / dtex or more and a tensile elastic modulus measured based on JIS L 1013 of 400 cN / dtex or more. The textile product according to claim 1. The fiber product according to claim 1 or 2, wherein the high-function filament yarn is an aramid fiber. The fiber product according to claim 3, wherein the aramid fiber is a polyparaphenylene terephthalamide fiber. The fiber product according to any one of claims 1 to 4, wherein the elastic fiber is a polyurethane-based elastic fiber. The textile product according to any one of claims 1 to 5, wherein the textile product is a knitted fabric.

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