JP2001131842A - Conjugate yarn, fabric and method for producing the fablic - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a conjugated yarn and a fabric capable of eliminating conventional defects such as hardness, thickness and irritating feeling, having flexibility, lightweight, excellent touch and no irritating feeling and useful for protectives, and the like, such as working globes, aprons and arm covers having good incision resistance and heat resistance, and to provide a method for producing the fabric. SOLUTION: This conjugated yarn is a sheath/core type conjugated yarn comprising a core component covered with a sheath component and is characterized by that the core component is untwisted wherein the core component is high strength staple having >=13 CN/dTex strength and >=177 CN/dTex elastic modulus and the sheath component is a water-soluble filament. Or, the conjugated yarn is a sheath/core type conjugated yarn comprising a core component covered with a sheath component and is characterized by that the core component is untwisted wherein the core component is heat resistant staple having >=27 limiting oxygen index(LOI) and the sheath component is water-soluble filament. The fabric comprises one of above conjugated yarns and the method for producing the fabric is characterized by dissolving the water-soluble filament in above fabric to be removed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a composite yarn and a fibrous structure having excellent cut resistance and heat resistance. More specifically, the present invention relates to a high-strength short fiber or a heat-resistant short fiber having a core of yarn. The present invention relates to a fiber structure in which a sheath is formed of a water-soluble long fiber and a core is formed of a non-twisted core-sheath composite yarn.

[0002]

2. Description of the Related Art A strength of 13 CN / dTex or more and an elastic modulus of 177 CN / dTex.
High strength fiber of dTex or higher, or limiting oxygen index (LOI)
Gloves using heat-resistant fibers of 27 or more, arm covers, protective clothing such as forehead, etc., because the fibers are hard to be cut with a blade and hard to burn, conventional gloves using cotton etc., arm covers, Cut resistance and heat resistance are remarkably high compared to protective clothing such as apron, and for example, in the automotive industry, washing machines, home appliance industries such as refrigerators, work on processed sheet metal products with burrs, or Work in the glass industry, which handles fragile glass products, or in the garbage collection and welding operations where general dust that may contain metal fragments or glass fragments may be easily cut or burned. Has been widely used to protect the hands and bodies of the elderly. However, from the work and the like, there is a strong demand for protective materials such as protective clothing such as gloves, foreheads and arm covers which are safer. Further, there is a demand for a protective garment that is even lighter, has higher flexibility, and has better workability.

In general, high-strength fibers such as aromatic polyamide fibers have excellent cut resistance and high rigidity. They are in a relationship.

[0004] Further, in safety protective clothing such as work gloves and work clothes, it is not preferable to give the wearer a feeling of fatigue or discomfort that hinders the work, and even if it is unavoidable, these are the minimum allowable. Must be about.
Even if it has excellent cut resistance, lack of flexibility in protective clothing such as gloves, aprons, arm covers, work clothes, etc. will give the wearer a feeling of fatigue. It is not preferable to give the wearer an unpleasant sensation such as a so-called tingling sensation. Flexible, less tingling, lightweight, cut-resistant gloves and apron,
It is extremely important for the industry to industrially produce protective materials such as protective clothing such as arm covers.

[0005] Gloves using aromatic polyamide fibers having excellent cut resistance and heat resistance are disclosed in, for example,
Japanese Patent No. 45708 proposes a method for producing gloves having excellent cut resistance by knitting and weaving a bulky yarn in which totally aromatic polyamide filaments having a single fiber fineness of 3.3 dTex or less are entangled with each other at random. Further, due to the improvement in heat resistance, Japanese Patent Publication No. 4-54168 discloses that a plurality of para-based wholly aromatic polyamide filaments having a single fiber fineness of 3.3 dTex or less are not included in a yarn for a woven fabric and a yarn for a loop pile. A glove excellent in heat resistance and heat insulating property constituted by pile knitting using a bulky yarn entangled with an artificial body has been proposed.

However, in the case where a higher cut resistance or heat resistance is intended to be achieved, it is not always sufficient. Also, Japanese Patent Application Laid-Open No. 9-157981 has been proposed which aims to improve cut resistance and flexibility and to increase the fineness, long fiber length and sweet twist of aromatic polyamide fibers. Although it improves, the reality is that the flexibility is not always sufficient, such as when worn for a long time. further,
There is a demand for more lightweight and flexible protective clothing.

[0007]

SUMMARY OF THE INVENTION In view of the drawbacks of the prior art, the present invention is a working glove that is flexible, lightweight, does not have a tingling sensation, is comfortable to the touch, and has high cut resistance and heat resistance. It is an object of the present invention to provide a composite yarn and a fiber structure useful for a protective material such as an apron, an arm cover and the like, and a method for producing the same.

[0008]

The present invention adopts the following means to solve the above-mentioned problems.
That is, the composite yarn of the present invention is a core-sheath type composite yarn obtained by covering a core component with a sheath component, and the core component has a strength of 1%.
3 CN / dTex or higher, a high-strength short fiber having an elastic modulus of 177 CN / dTex or higher, wherein the sheath component is composed of a water-soluble long fiber, and the core component is non-twisted,
The composite yarn of the present invention is a core-sheath type composite yarn obtained by covering a core component with a sheath component, wherein the core component has a limiting oxygen index (L
OI) a heat-resistant short fiber of 27 or more, wherein the sheath component is composed of a water-soluble long fiber, and the core component is non-twisted.

Further, the fiber structure of the present invention is a fiber structure comprising the composite yarn described in any one of the above, and the method for producing the fiber structure of the present invention further comprises the step of It is characterized in that the long fibers are dissolved and removed.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention relates to a core-sheath type composite yarn, in which the core is made of a high-strength, heat-resistant short fiber and non-twisted, the sheath is made of a water-soluble long fiber, and the core is formed into a thread by covering. It is based on the fact that the core component is non-twisted, and is a fiber structure using the same, and the present invention cannot be achieved without this.

After processing into a fiber structure using the composite yarn, water-soluble fibers are dissolved and removed, and non-twisted high-strength short fibers and heat-resistant short fibers are lightweight, flexible, and excellent in cut resistance and heat resistance. A structure can be manufactured, and furthermore, such a composite yarn or fiber structure can be used to manufacture a protective material including a flexible and cut-resistant glove, an apron, an arm cover, an ankle cover, and protective clothing.

The high-strength short fibers used in the present invention include para-aramid fibers such as "Kevlar" manufactured by Toray DuPont, "Technola" manufactured by Teijin Limited,
Nippon Aramid's "Twaron" or the like can be used. In addition, PBO fiber such as "Zylon" manufactured by Toyobo Co., Ltd., high-strength polyethylene such as "Dyneema" manufactured by Toyobo Co., Ltd., polyarylate fiber For example, "Vectran" manufactured by Kuraray Co., Ltd. can be used.

The heat-resistant fibers include para-aramid fibers, meta-aramid fibers, PPS fibers, and PBO fibers.
Fibers and the like can be used. Of these, para-aramid fibers are particularly preferred.

[0014] Such fibers are required to have
When the core component is high in strength, the tensile strength is 13 CN / dTex or more and the elastic modulus is 177 CN / dTex or more. In the case where the core component is heat-resistant, it has a limiting oxygen index (LOI) of 27 or more. Required. If the tensile strength is less than 13 CN / dTex and the elastic modulus is less than 177 CN / dTex, it is easily broken and the cut resistance is low. On the other hand, when the limiting oxygen index (LOI) is less than 27, the function as a protective material is impaired due to carbonization, discoloration and strong deterioration due to a change due to heat.

It is evident that high strength fibers generally become harder to cut as the single fiber fineness increases.
In order to improve the cut resistance of protective clothing such as gloves, aprons and arm covers, it is effective in principle to increase the single fiber fineness. Japanese Patent Publication No. 55-14170 discloses a para-based wholly aromatic polyamide fiber having a single fiber fineness of at most 22 dTex. Therefore, if this technology is adopted, gloves and knitted fabrics with excellent cut resistance can be produced, but the flexural hardness of short fibers increases dramatically with an increase in the fiber diameter. Only by adopting the manufacturing method, gloves and knitted fabrics are not flexible, and only gloves and knitted fabrics with a feeling of prickiness can be produced.

In order to greatly improve the cut resistance of fibrous structures such as gloves and knitted fabrics and to obtain flexibility, the single-fiber fineness of high-strength fibers or heat-resistant fibers is 0.7 to 7.0 dTex. The range of 0.7 to 3.3 dTex is suitable for the field where cut resistance, light weight and thinness are required, and the cut resistance, heat resistance and flexibility are also preferable. In fields where is strongly required, those having a range of 3 to 6.0 dTex are preferably used.

Even if the fiber length and the twist coefficient of the spun yarn are adjusted appropriately, the gloves and knitted fabrics are not flexible, and it is difficult to eliminate the tingling. The fiber thickness dTex (decitex) is expressed as dTex when the fiber length is L (m) and the weight is W (g).
= (W / L) × 1000, and the larger the dTex number, the thicker the fiber. The twisted spun yarn has a fiber end protruding in the diameter direction of the spun yarn to form a fluff, which gives a tingling sensation.

In general, in the case of short fibers, in the ordinary spinning method, as the fiber length is longer, the number of twists can be set lower, and a spun yarn having flexibility can be obtained. On the other hand, as the fiber diameter is larger, the rigidity is higher, so that the tingling sensation which is the stimulation of the fiber to the skin is increased.

The fiber structure such as gloves and knitted fabric is made flexible,
At the same time, in order to eliminate the tingling sensation, first, a spun yarn consisting of short fibers having a fiber length suitable for the single fiber fineness is employed. When the high-strength fiber or the heat-resistant fiber has a single fiber fineness of 3.3 to 6.0 dTex, the average fiber length is preferably 5 to 15 cm, more preferably 7 to 13 cm. These problems can be solved all at once by using them.
When the average fiber length is less than 5 cm in the case of exceeding 3 dTex, it is necessary to make the twist coefficient shown below larger than 3 in order to obtain good spinnability. Under these conditions, since the number of twists is large, it is difficult to obtain a spun yarn having a soft texture suitable for a knitted fabric used for protective clothing for gloves. If the average fiber length is larger than 15 cm, it is difficult to produce spun yarn with existing spinning equipment.

In the present invention, after a core fiber is wound around a core fiber to form a continuous yarn by imparting yarn strength by bundling and bundling, a fiber structure is produced using the composite yarn and then melted. The water-soluble fiber of the sheath is removed to obtain a fibrous structure of a non-twisted high-strength fiber or a short fiber of a heat-resistant fiber. Twisting as a second requirement for eliminating a soft and prickly feeling By eliminating the number, cut resistance and heat resistance can be maintained, and flexibility and tingling can be greatly improved. That is, since the fiber ends of the non-twisted yarn are arranged in the length direction of the spun yarn, there are few fluffs protruding from the fiber structure, and the tingling feeling is improved.

The thickness of the composite yarn depends on the application, but in applications where cut resistance, heat resistance or flexibility is strongly required, the cotton yarn count should be in the range of 4 ^{S / 1} to 30 ^{S / 1.} Is preferably used, but in applications where cut resistance, flexibility, thinness and light weight are strongly required, those having a range of 30 ^{S / 1 to} 160 ^{S / 1} are preferably used.

The spinning direction of the composite yarn may be either S or Z, and the twisting coefficient is preferably K = 2.0-5, more preferably 2.5-4. The number of twists here is the number of times the water-soluble fiber winds the short fiber bundle of the core component, and the twist coefficient K = T / S1 / ² , where T is the number of twists (twice / 2.54 cm). ) And S are cotton counts represented by the following equations. When the weight of the yarn length L (m) is W (g), S = 0.5908 L / W.

In the practice of the present invention, a high-strength, heat-resistant aramid fiber is produced by a conventionally known production method (for example, Japanese Patent Application Laid-Open No.
No. 14170), which is usually cut into a predetermined length by a square cut and stapled. Stapling may also be performed by variable cutting with an average fiber length of ± 25%, or may be performed by a stapling method in which a long fiber is cut by a speed difference between a pair or more rollers that grip the long fiber.

The water-soluble filaments referred to in the present invention include vinylon-based and nylon-based fibers, and are preferably polyvinyl alcohol-based (for example, Solvlon (registered trademark) manufactured by Nichibi Co., Ltd.).

As an example of the water-soluble fiber used as the sheath component, the fiber properties of "SOLBRON" manufactured by Nichibi Co., Ltd. are as follows: melting temperature 36 ° C. ± 4 ° C., time required for complete melting, 30 minutes, single fiber strength 3.1 to One having 4.0 CN / dTex and an elongation of 15 to 20% can be used. Also, when obtaining a thick-count composite yarn, it is preferable to use 62-333 dTex, and when obtaining a fine-count composite yarn, it is preferable to use a 40-28 dTex water-soluble multifilament yarn.

In the practice of the present invention, a composite yarn comprising para-aramid short fibers can be made into a roving yarn by means of ordinary spinning or the like, and using this roving yarn, for example, a tri-spinner [Koseki Tosho Shoten Co., Ltd. The composite yarn of the present invention can be obtained by forming a long and short composite with a water-soluble long fiber yarn. Further, other fibers can be mixed as long as the effects of the present invention are not impaired.

The ratio of the core component to the composite yarn is 60 to 9
7% by weight is preferred. Within such a range, after removing the water-soluble filamentous yarn of the sheath component, the voids of the fabric and the fiber structure are moderate, the function as a protective material is unlikely to be reduced, and the amount of the water-soluble fiber of the sheath component is low. In short, the convergence of the composite yarn is weak, and the strength of the composite yarn is not reduced.

Cotton count 1 of a para-aramid fiber spun yarn of the present invention, for example, having a single fiber fineness of 1.5 dTex and a cut length of 3.8 cm
The physical property of 0 ^S / 1 has a tensile strength of 8.45 N / strand, which is slightly lower than the tensile strength of 40 N / strand of the ring spun yarn 10 ^S / 1 of the same fiber, but the cut resistance is It is due to the intrinsic properties of the fiber, and has no direct relationship with the tensile strength of spun yarn, whose tensile strength depends on the twist.

The form of the spun yarn used may be a single yarn, a twin in which two single yarns are aligned, or a triple in which three single yarns are aligned. Generally, in a woven fabric, a single yarn or twins are used. For gloves, twins without residual torque are used so as not to cause knitting of the knitted fabric due to the torque of the yarn. By removing the fiber, the para-aramid short fiber remaining as a product is non-twisted, has no residual torque, and can be used as a single yarn.

The fiber structure is the composite yarn 10 of the present invention.
It may be constituted by 0%, or may be used in combination with other fibers or yarns as in the case of cross weaving and knitting. Depending on the type of the protective material of the present invention, a raised fabric such as a pile fabric can be used.
The raised fabric using the yarn of the present invention becomes non-twisted after washing with hot water, and has a very good raising efficiency in the raising process, and can be a bulky and soft fabric.

Further, the protective material of the present invention may be composed entirely of such a composite yarn or a fibrous structure or the like, and they are used as necessary parts in the range of 50 to 100% by weight of the protective material. It may be. For example, in a working glove, the spun yarn or fiber structure of the present invention can be used in a specific portion, such as only a fingertip portion or a palm portion, depending on the work content. The fibrous structure and the protective material can be coated with a resin, if necessary.

The protective material of the present invention is particularly suitable for applications where severe environmental conditions are required, including those used directly for protective material purposes, as a result of which the protective material function is achieved. Also included are, specifically, the above-mentioned work or industrial gloves, arm cover, apron, ankle cover, work shoes, baseball socks, work clothes for welding, for sports, from cuts with screws Outerwear for boat racers to protect the body, pants, socks for baseball and soccer,
Using fencing uniforms as welding tools, curtains for welding work, firefighters, firefighting hoses, or ultra-fine composite yarns, lightweight and flexible cut-resistant wounds, heat-resistant protective materials such as thin Examples include, but are not limited to, protective gloves and thin coated base fabrics.

[0033]

The present invention will now be described more specifically with reference to examples.

The method of measuring characteristic values and the like in the examples is as follows. The properties of the para-based wholly aromatic polyamide fiber “Kevlar” (registered trademark) used in Examples and Comparative Examples are as follows: tensile strength 23 CN / dTex, tensile modulus 520
CN / dTex, critical oxygen index 30. (1) Cut wound resistance A test piece is fixed between two plate-shaped sample support plates having a slit of 10 mm in width and 50 mm in length at the center of the frame, and this test piece is V-shaped knife. That is, ceramic blades on two sides at an angle of 60 degrees are vertically applied to the test piece, pressed against the cutting edge at a speed of 500 mm / min, and the maximum load at which the test piece is cut is measured. The average value of 10 was shown. (2) Flexibility Knitted fabrics and gloves were measured as rigidity using a Gurley-type testing machine according to JIS L 1018 “Knitted fabric test method” 6.21.1. The glove was cut into a cylindrical knitted test piece by cutting a 6.4 cm portion of the middle finger from the tip, and attached to the chuck so that the fingertip touched the pendulum. Further, the flexibility of the knitted fabric was measured as the bristles according to JIS L1096 “General Fabric Testing Method” 6.20.1. In each case, it was determined that the lower the bending resistance, the better the flexibility. (3) Feeling of tingling The gloves were judged by the feeling of 10 persons wearing them, and the knitted fabric was judged by the feeling of 10 persons to the cloth.
Those that were judged to have no tingling at 60% or more were judged to have no tingling. No tingling was indicated by ○, and tingling was indicated by ×. Examples 1-2 A single fiber fineness of Toray DuPont was 1.7 to 3.3.
dTex para-based wholly aromatic polyamide fiber "Kevlar" (registered trademark) is wrapped at a rate of 6 piles / 2.54 cm,
It was cut into 3.8 cm to make short fibers. This was passed through a cotton opener, a card drawing or a gil in the order of a sliver to obtain a core component. A water-soluble fiber (“SOLBRON” manufactured by Nichibi Co., Ltd.) filament 44dTex / 12 filament was used as a sheath component, and the composite was processed by a tri-spinner spinning machine. Thus, a composite spun yarn having a core / sheath component ratio of 93/7% was obtained. Furthermore, five gloves are aligned and supplied to a 7-gauge glove knitting machine of Shima Seiki Co., Ltd. to knit gloves, wash at 80 ° C. for 20 minutes to remove “Sorblon”, and gloves weighing 60 g / two. It was created. Table 1 summarizes the cut resistance, flexibility, and tingling of these gloves. Comparative Example 1 As Comparative Example 1, gloves were knitted on a 100% ring spun yarn of a commercially available para-based aromatic polyamide short fiber “Kevlar” as in the example. The cut resistance, flexibility, and tingling of the gloves were evaluated in comparison with the examples, and the results are shown in Table 1. Comparative Example 2 An attempt was made to produce a non-twisted spun yarn using the same short fiber as in the above example using a ring spinning machine. However, since there was no sheath component, yarn breakage occurred frequently and spinning was difficult. Comparative Example 3 The cut resistance, flexibility, and tingling of a commercially available cotton glove were evaluated in comparison with the examples, and the results are shown in Table 1.

[0035]

[Table 1]

As is clear from Table 1, Example 1.2 has the same cut resistance as Comparative Example 1, but has significantly improved flexibility and is superior to the commercially available products. The tingling sensation in Example 2 and Comparative Example 1 was equivalent to 60%, but in Example 1, 90% of the persons were flexible. Comparative Example 2 was spun in the same manner as in Example 1, but did not become a spun yarn due to the absence of a sheath component, and could not be knitted into gloves. Comparative Example 3 is a commercially available glove having excellent flexibility and tingling, but has low cut resistance and low LOI value.

[0037]

According to the present invention, as described above, the aromatic polyamide fiber is non-twisted, and a fabric, a fiber structure, and a protective material using spun yarns from ultra-fine counts to thick counts can be obtained. A fiber structure such as a composite yarn having high creativity and a knitted fabric using the composite yarn can be obtained. Further, in the present invention, a protective material such as protective clothing excellent in cut resistance, lightweight, and excellent in flexibility is obtained, which does not give a wearer a feeling of fatigue, and is caused by stimulation of hard fiber ends. Also, it does not give the wearer an unpleasant feeling like a so-called tingling sensation. In particular, work gloves that require severe use environment conditions such as cut resistance and heat resistance, protective materials such as protective aprons, and thin protective gloves that require lightweight and flexibility using ultra-fine count yarn, protective It is suitable as an ultra-thin coated cloth such as an apron or a cloth suitable for outdoor sports clothing.

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Shujiro Ueda 1-1-1, Oe, Otsu City, Shiga Prefecture Inside the Seta Plant of Toray Industries, Inc. (72) Inventor Takeshi Hatano 3-4-1, Dojima, Kita-ku, Osaka-shi No. Toray Dupont Co., Ltd. (72) Inventor Yoshiji Moriwaki 1-1-1, Oe, Otsu, Shiga Prefecture F-term (reference) in the Toda Corporation Seta Plant 4L002 AA06 AB01 AB02 AB03 AC00 AC01 AC04 DA00 EA00 FA01 FA04 4L036 MA04 MA06 MA24 MA33 MA35 MA37 MA39 PA46 RA15 RA24 UA01 UA07 4L048 AA18 AA25 AA33 AA34 AA48 AA51 AA53 AB13 AB18 AB19 AC12 AC14 AC19 CA01 CA04 CA06 DA01 DA03 DA07 EB04

Claims (7)

[Claims] A core-sheath type composite yarn comprising a core component covered with a sheath component, wherein the core component has a strength of 13 CN / dTex or more.
A composite yarn comprising high-strength short fibers having an elastic modulus of 177 CN / dTex or more, wherein the sheath component comprises a water-soluble long fiber, and wherein the core component is non-twisted. 2. A core-sheath type composite yarn comprising a core component covered with a sheath component, wherein the core component has a limiting oxygen index (LOI).
A composite yarn comprising 27 or more heat-resistant short fibers, wherein the sheath component is made of a water-soluble long fiber, and the core component is non-twisted. 3. The composite yarn according to claim 1, wherein the high-strength short fiber is a para-aramid fiber. 4. The composite yarn according to claim 2, wherein said heat-resistant short fiber is an aramid fiber. 5. The core component is 60 to 97% by weight, the sheath component is 3 to 40% by weight, and the core component has a single fiber yarn fineness of 0.
6 to 6.0 dTex, average fiber length 2.54 to 15.0 cm
The composite yarn according to any one of claims 1 to 4, wherein 6. A fibrous structure comprising the composite yarn according to claim 1. 7. A method for producing a fibrous structure, comprising dissolving and removing the water-soluble long fibers in the fibrous structure according to claim 6.