JP2016132841A - Blended yarn - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a blended yarn having cut resistance nearly equal to those of a spun yarn of staple fibers of high-strength organic fibers, and a woven or knitted fabric comprising the blended yarn.SOLUTION: A blended yarn comprises: staple fibers (A) of a high-strength organic fiber in which raw yarns thereof have a tensile strength of 17.5 cN/dtex or more measured in accordance with JIS L 1013 8.5; and staple fibers (B) of a regenerated fiber. The blend ratio of the regenerated fibers (B) in the spun yarn is 1 to 15 wt.%.SELECTED DRAWING: None

Description

  The present invention relates to a blended yarn composed of high-strength organic fiber staples and recycled fiber staples, and a woven or knitted fabric containing the blended yarn.

  High-strength organic fibers such as aramid fiber, wholly aromatic polyester fiber, or polyparaphenylene benzobisoxazole fiber have a high decomposition temperature of 400 ° C or higher and a critical oxygen index of about 25 or higher. However, it is a material excellent in heat resistance and flame retardancy that has the property that combustion does not continue when the flame is moved away. Therefore, these fibers are favorably used as protective clothing for clothing products, such as fire fighting clothes, racing suits, iron and welding work clothes, gloves, etc., in scenes with a high risk of exposure to flames and high heat. . Above all, para-aramid fibers that have both heat resistance and high strength properties are difficult to cut with a blade (ie, excellent in cut resistance), and are therefore used in work gloves for preventing wounds. .

  Conventionally, spun yarns of high-strength organic fiber staples have been used when manufacturing clothing products using these high-strength organic fibers. However, these high-strength organic fibers have high rigidity. Therefore, when manufacturing clothing products such as fire clothes, racing suits, work clothes or gloves using the spun yarn, the high-strength organic fibers are used when the clothing products are worn. There were difficulties in wearing comfort and feeling, and difficulty in activities and work. Although it is possible to improve the difficulty by reducing the basis weight of the woven or knitted fabric, in this case, the number of spun yarns hitting the blade is reduced, so that the cut resistance is lowered.

  Therefore, as a method of obtaining a garment product having excellent cut resistance, a woven or knitted fabric is formed using a coated yarn obtained by winding a spun yarn or a crimped yarn of high-strength organic fiber around a stretchable elastic fiber. The method is known. However, these garment products also have problems such as a complicated yarn manufacturing process and high cost. Therefore, a spun yarn that does not affect the cut resistance, which is an excellent feature of high-strength organic fibers, has been desired.

  On the other hand, Patent Document 1 discloses a woven fabric made of spun yarn using carbon fiber flame retardant fibers such as high-strength organic fibers (aramid fibers) and flame retardant rayon fibers in a weight ratio of 35/65 to 65/35. By making the ratio of both fibers within the above-mentioned range, a fabric having high flame resistance is obtained while having lightness and air permeability. Patent Document 2 discloses a woven fabric using spun yarn using aramid fibers and recycled fibers in a weight ratio of 20/80 to 60/40, and the ratio of the fibers is within the above range. Thus, a fabric excellent in flame retardancy, camouflage and wearing comfort is obtained. However, these documents do not mention cut resistance.

JP 2008-101294 A JP 2007-298199 A

  In view of the background of the prior art, the present invention is to provide a blended yarn having cut resistance substantially equivalent to a spun yarn of a high-strength organic fiber staple and a woven / knitted fabric including the blended yarn.

  The present invention employs the following means in order to solve such problems. That is, the present invention is as follows.

(1) A spun yarn comprising a high-strength organic fiber staple (A) having a tensile strength of 17.5 cN / dtex or more measured according to JIS L 1013 8.5 and a recycled fiber staple (B). A blended yarn, wherein the blend ratio of the recycled fiber staple (B) in the spun yarn is 1 to 15% by weight.
(2) The blended yarn according to (1), wherein the spun yarn has a cotton count of 5 to 30 and a twist coefficient in the range of 2.5 to 3.5.
(3) The blended yarn according to (1) or (2), wherein the high-strength organic fiber staple is a para-aramid fiber staple.
(4) The blended yarn according to any one of (1) to (3), wherein the recycled fiber staple is a rayon fiber staple.
(5) The blended yarn according to any one of (1) to (4), wherein the single spun yarn has a tensile strength of 6.6 cN / dtex or more.
(6) A woven or knitted fabric including the blended yarn according to any one of (1) to (5).

  The blended yarn of the present invention uses a high-strength organic fiber staple and a recycled fiber staple at a predetermined blend ratio, and thus has a high level of cut resistance that has not been obtained in the past, and is manufactured. Since the process is simple, there is an advantage that it can be manufactured at low cost. Therefore, the garment product using the woven or knitted fabric made of the blended yarn according to the present invention has a cut resistance (cutting force per basis weight) of the woven or knitted fabric. There is no inferiority compared to creativity.

It is a graph which shows the relationship between the blend rate of a recycled fiber, and the tensile strength of a blended yarn. It is a graph which shows the relationship between the mixing rate of a recycled fiber, and the cut resistance of a woven or knitted fabric.

  It is well known that high-strength organic fibers such as para-aramid fibers have much higher tensile strength, cut resistance, and modulus (rigidity) than synthetic fibers such as polyester fibers and nylon fibers. Especially in protective clothing products that require high cut resistance, it is extremely difficult to impart other characteristics without reducing cut resistance. Reduces cut resistance. However, it is not only surprising that the cut-resistant property of the woven or knitted fabric is maintained, but that the regenerated fiber is in a staple state and mixed with a small amount of high-strength organic fiber staples of the same thickness or less. It has been found that the feeling of wearing and workability of clothing products are dramatically improved since the adhesiveness of the fabric is improved and the feeling of cooling contact is improved. Hereinafter, details of the blended yarn of the present invention and the woven or knitted fabric including the same will be described.

  The high-strength organic fiber staple used for the blended yarn of the present invention has a tensile strength of 17.5 cN / dtex or more, more preferably 17.5 to 35 cN / dtex. The tensile strength is defined as the tensile strength of the raw yarn measured according to JIS L 1013 8.5. Examples of such high-strength organic fibers include para-aramid fibers, wholly aromatic polyester fibers, polyparaphenylene benzobisoxazole fibers, etc., and these fibers all have a decomposition start temperature higher than 400 ° C., Since it does not melt even when the flame is brought close, it has excellent heat resistance. When the tensile strength is less than 17.5 cN / dtex, it becomes impossible to impart cut resistance to the blended yarn, which is unsuitable for use in protective clothing products.

  Examples of the para-aramid fiber include polyparaphenylene terephthalamide fiber (manufactured by Toray DuPont, trade name “Kevlar” (registered trademark)), copolyparaphenylene-3,4′-diphenyl ether terephthalamide fiber (Teijin Techno Products) Product name "Technola"). Examples of the wholly aromatic polyester fiber include a product name “Vectran” manufactured by Kuraray Co., Ltd., and examples of the polyparaphenylene benzobisoxazole fiber include a product name “Zylon” manufactured by Toyobo Co., Ltd. Among these fibers, para-aramid fibers are preferable, and polyparaphenylene terephthalamide fibers excellent in cut resistance are particularly preferable.

  The recycled fiber used in the blended yarn of the present invention is a fiber made from pulp made by solidifying wood or linter fiber, and the pulp is once melted by some method, extruded from a narrow hole, stretched, and stretched. A fiber that has been regenerated in the form. There are approximately three methods for producing regenerated fibers, including viscose rayon and polynosic; copper ammonia method cupra; direct dissolution method tencel and lyocell (both are registered trademarks). The reason why the recycled fiber is used as a material to be blended with the high-strength organic fiber staple in the present invention is that it does not melt even when burned and therefore does not inhibit the heat resistance of the high-strength organic fiber staple. Moreover, it is because the moisture content is as high as silk, has high hygroscopicity and draping properties, and has a soft texture.

  Among the above-mentioned recycled fibers, rayon and polynosic are preferable because they use renewable resources and are relatively inexpensive. The cross section of the rayon fiber may be non-circular or circular.

  The single fiber fineness (AF) of the high-strength organic fiber staple (A) is preferably in the range of 0.3 to 4.7 dtex, more preferably 0.5 to 3.5 dtex. When the single fiber fineness (AF) is less than 0.3 dtex, the workability of the spun yarn is unstable, and when it exceeds 4.7 dtex, the spun yarn has high rigidity, thereby obtaining a flexible knitted or knitted fabric. It becomes difficult to be.

  The single fiber fineness (BF) of the regenerated fiber staple (B) is preferably in the range of 0.6 to 6.0 dtex, more preferably 0.9 to 4.0 dtex. If the single fiber fineness (BF) is less than 0.6 dtex, yarn breakage tends to occur during spinning yarn processing, and if it exceeds 6.0 dtex, the regenerated state of the yarn tends to be poor. The quality stability of the yarn and the woven / knitted fabric decreases.

The high-strength organic fiber staple (A) and the regenerated fiber staple (B) preferably have a single fiber fineness satisfying the following formula.
AF-1.7 ≦ BF ≦ AF + 1.7
(Here, AF: A single fiber fineness (dtex), BF: B single fiber fineness (dtex))
That is, by adjusting the difference in the single fiber fineness between the high-strength organic fiber staple (A) and the regenerated fiber staple (B) within 1.7 dtex, the synergistic effect between the high-strength organic fiber and the regenerated fiber staple is easily exhibited. . On the other hand, if the difference in the single fiber fineness is too large, the workability and uniformity of the spun yarn become insufficient.

  The fiber lengths of the high-strength organic fiber staple (A) and the regenerated fiber staple (B) are preferably 25 to 100 mm, more preferably 30 to 65 mm. In order to obtain a spun yarn having high tensile strength, a longer fiber length is preferable, but from the viewpoint of workability in the spinning process, it is preferably 100 mm or less. Further, from the viewpoint of processability in the spinning process, it is particularly preferable that the fiber lengths of the high-strength organic fiber staple (A) and the regenerated fiber staple (B) are approximately the same.

  In the spun yarn of the present invention, the mixing ratio of the recycled fiber staple (B) in the spun yarn is 1 to 15% by weight. More preferably, it is 2 to 15% by weight, and particularly preferably 3 to 10% by weight. When the mixing ratio of the recycled fiber staple (B) is less than 1% by weight, the adhesiveness with the rubber becomes insufficient. On the other hand, when the mixing ratio of the regenerated fiber staple (B) exceeds 15% by weight, the cut resistance is insufficient.

In the blended yarn of the present invention, a spun yarn is obtained by a conventional method through each process of spinning, kneading, roving, and fine spinning. The high-strength organic fiber staple (A) having a predetermined single fiber fineness and a predetermined fiber length and the regenerated fiber staple (B) are mixed at a predetermined ratio in a blended cotton process or a kneading process. Here, the twist of the spun yarn is represented by a twist coefficient K determined by the following equation in addition to the number of twists per unit length.
Twist factor K = t / s ^1/2
t: Number of twists (times / 2.54 cm)
s; Cotton count

  The twist coefficient is usually set in the range of 2.5 to 3.5 depending on the thickness and use of the blended yarn. In the blended yarn of the present invention, since it is used for the weft and / or warp of the woven or knitted fabric, it is more desirable to set it in the range of K = 2.7 to 3.3. The thickness of the blended yarn is desirably 30 s to 5 s in order to obtain a predetermined woven / knitted fabric basis weight. If it is less than 5 s, the workability of the spun yarn is inferior, and if it exceeds 30 s, the strength of the spun yarn becomes insufficient. As the yarn becomes thinner, the number of counts increases. The form of the blended yarn used for the woven or knitted fabric may be a single yarn after spinning, or may be a double yarn in which two single yarns are aligned and twisted in the opposite direction to the single yarn, and the yarn count is 30/2 s to 5 / 2s is desirable. Further, it is desirable to adjust the count and the twist coefficient K so that the tensile strength of the single spun yarn is 6.6 cN / dtex or more.

  When the blended yarn of the present invention is woven into a woven fabric, the woven structure is selected according to the desired texture and design, such as plain weave, twill weave, and satin weave. The resulting woven and clothing products have good cut resistance and a feeling of wearing (contact cooling feeling), so that they can be used as materials for outdoor sports clothes, general sports clothes, work clothes, or shoes, bags, bags. It can be used as a material for products such as.

  Further, when a glove is produced by knitting the blended yarn of the present invention into a knitted fabric, the produced glove is attached to a hand mold, and the glove is impregnated with a rubber or resin coating material and then dried. Alternatively, the surface of the glove may be coated with a coating material by attaching or adhering rubber or resin to the glove.

  Examples of the coating material include polyurethane resin, vinyl chloride resin, latex, synthetic rubber, and natural rubber. In this application, natural rubber latex is used in particular, but the present invention is not limited to this.

  The coating material may be used by a conventionally known method. For example, the coating with natural rubber latex is formed by a dip molding method. That is, it is formed by attaching the produced glove to a hand mold or the like, impregnating the glove with a coating material of natural rubber latex, and then drying. Alternatively, the coating material is attached to the surface of the glove by attaching and adhering rubber or resin to the glove. Thereby, in addition to characteristics such as heat resistance and cut resistance, it is possible to produce a glove that has both wear resistance and water resistance and is not slippery when grasping an object.

  The coating material may be applied to at least a part of the glove surface. For example, it may be applied to the entire surface of the palm side and the fingertip part, may be applied to the entire surface including the back part of the hand, or it may be applied only to the predetermined fingertips even if it is applied only to the finger part. You may make it adhere and other forms may be sufficient.

  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 physical-property value in a following example and a comparative example is as follows.

[Tensile strength and tensile strength]
The tensile strength (cN) of the spun yarn was measured according to JIS L 1095: 2010 “General spun yarn test method” 9.5. The tensile strength of the spun yarn was calculated from the tensile strength. The conversion from cotton count to dtex was calculated by the following formula. (Dtex) = 5905 / (cotton count)

[Rubber adhesion]
5 spun yarns (twist yarn 20 / 2s) were buried in an unvulcanized rubber block so that the spun yarn would not overlap, and the surface layer was vulcanized at 160 ° C. for 20 minutes to bond the spun yarn and rubber. . Next, the force (N / 5) applied when five spun yarns were simultaneously peeled from the rubber block was measured with a tensile tester. The pulling speed at this time was 300 mm / min. The rubber having the following composition was used.

[Contact sensation]
Using a Catotech Co., Ltd., KES-F7, Thermolab II type, under the measurement conditions of environmental temperature 20 ° C., humidity 65% RH, contact pressure 98 cN / cm ² , contact area 9 cm ² (3 cm × 3 cm) The peak value qmax (W / cm ² ) of the heat transfer amount of the knitted fabric was measured. It was determined that the greater the value of qmax, the better the feeling of cool contact.

[Cut strength and cut resistance (cut resistance)]
In accordance with JIS T 8052: 2005 “Protective clothing—mechanical properties—cutting resistance test method for sharp objects”, the cutting force (N) of the palm of the glove was measured. Cut resistance (N) was divided by the basis weight of the woven or knitted fabric to determine cut resistance. The larger the cut resistance value, the more difficult it was to cut.

(Examples 1-5, Comparative Example 1)
As a high-strength organic fiber staple (A), a para-aramid fiber staple manufactured by Toray DuPont (trade name Kevlar (R), tensile strength 20.3 cN / dtex, tensile elastic modulus 490 cN / dtex, critical oxygen index 29, single fiber A fineness of 1.7 dtex, a fiber length of 51 mm, and a number of crimps of 8 peaks / 2.54 cm) were used.
As the regenerated fiber staple (B), in Examples 1, 2, 4, and 5, ordinary rayon fibers manufactured by Daiwabo Rayon Co., Ltd. (single fiber fineness 1.7 dtex, fiber length 51 mm, crimped number 8 crests / 2.54 cm) are used. used. In Example 3, ordinary rayon fiber (single fiber fineness 2.2 dtex, fiber length 51 mm) manufactured by the same company was used.
Para-aramid fiber staples and ordinary rayon fiber staples are mixed in a conventional method at a predetermined ratio (weight ratio) shown in Table 1, and then mixed in a cotton-making process, and then subjected to spinning, kneading and roving in the spinning process. Through each process of ring spinning, a spun yarn 20s (cotton count / single yarn) having a twist number of 13.0 (times / 2.54 cm) and a twist direction Z was produced. The twist coefficient K = 2.9.

  Two spun yarns (single yarn) obtained were aligned and twisted in the S direction opposite to the single yarn with a twist number of 8.5 (twist / 2.54 cm) to obtain a twin yarn 20 / 2s. The twist coefficient K = 2.7.

Next, the obtained spun yarn (20 / 2s) was supplied to a 14-gauge cylindrical knitting machine to produce a knitted fabric. Separately, 5 spun yarns (20 / 2s) obtained were supplied to a 7 gauge type glove knitting machine (Shimane Seiki Seisakusho Co., Ltd.) to knit gloves with a weight of 538 to 562 g / m ^{2 on} the palm. I gave it.

(Example 6)
Spinning with a twist number of 13.0 (times / 2.54 cm) and a twist direction Z in the same manner as in Example 2 except that a rayon fiber having a single fiber fineness of 0.9 dtex was used as the regenerated fiber staple (B). A yarn 20s (cotton count / single yarn) was produced. The twist coefficient K = 2.9.
Two spun yarns (single yarn) obtained were aligned and twisted in the S direction opposite to the single yarn with a twist number of 8.5 (twist / 2.54 cm) to obtain a twin yarn 20 / 2s. The twist coefficient K = 2.7.
Next, the obtained spun yarn (20 / 2s) was supplied to a 14-gauge cylindrical knitting machine to produce a knitted fabric. Separately, 5 spun yarns (20 / 2s) obtained were supplied to a 7 gauge type glove knitting machine (Shimae Seiki Seisakusho Co., Ltd.), and gloves with a basis weight of 544 g / m ^{2 on} the palm of the hand were knitted. .

(Comparative Example 2)
The number of twists is 13.0 (times / 2.54 cm) and the twist direction is Z in the same manner as in Example 2 except that polyester fibers having a single fiber fineness of 1.7 dtex are used instead of the recycled fiber staple (B). Spun yarn 20s (cotton count / single yarn) was produced. The twist coefficient K = 2.9.
Two spun yarns (single yarn) obtained were aligned and twisted in the S direction opposite to the single yarn with a twist number of 8.5 (twist / 2.54 cm) to obtain a twin yarn 20 / 2s. The twist coefficient K = 2.7.
Next, the obtained spun yarn (20 / 2s) was supplied to a 14-gauge cylindrical knitting machine to produce a knitted fabric. Separately, 5 spun yarns (20/2 s) obtained were supplied to a 7 gauge type glove knitting machine (Shimane Seiki Seisakusho Co., Ltd.), and gloves with a basis weight of 548 g / m ^{2 on} the palm of the hand were knitted. .

  Table 1 shows the results of evaluating the spun yarns obtained in Examples and Comparative Examples, and the tubular knitted fabric and gloves knitted using the yarns by the test method.

  From Table 1, the gloves produced in Examples 1 to 6 have a soft and voluminous texture, good adhesion to rubber and cool contact feeling, good wearing feeling, and difficult to cut with a knife. It had cut resistance. On the other hand, the glove produced in Comparative Example 1 was excellent in cut resistance but inferior in adhesion to rubber. The glove produced in Comparative Example 2 was not only inferior in cut resistance but also in adhesion to rubber.

  FIG. 1 is a graph showing the tensile strength of rayon / Kevlar (R) blended yarn (20 / 2s) produced in the example, and FIG. 2 is a graph showing the cut resistance of the glove produced in the example. . In the blended yarn of the present invention, the tensile strength of the yarn gradually decreases with the mixing rate of the rayon fiber, but the cut resistance of the gloves knitted using the mixed spinning yarn is almost reduced even when the mixing rate of the rayon fiber is increased. I understand that I do not.

  The blended yarn of the present invention and the woven or knitted fabric including the same are suitably used as protective clothing such as fire clothes, racing suits, iron / welding work clothes, and gloves.

Claims (6)

  A spun yarn comprising a high-strength organic fiber staple (A) having a tensile strength of a base yarn measured in accordance with JIS L 1013 8.5 of 17.5 cN / dtex or more and a regenerated fiber staple (B), A blended yarn, wherein the blend ratio of the recycled fiber staple (B) in the spun yarn is 1 to 15% by weight.   The blended yarn according to claim 1, wherein the spun yarn has a cotton count of 5 to 30 and a twist coefficient of 2.5 to 3.5.   The blended yarn according to claim 1 or 2, wherein the high-strength organic fiber staple is a para-aramid fiber staple.   The blended yarn according to any one of claims 1 to 3, wherein the recycled fiber staple is a rayon fiber staple.   The blended yarn according to any one of claims 1 to 4, wherein the spun yarn has a tensile strength of 6.6 cN / dtex or more.   A woven or knitted fabric comprising the blended yarn according to any one of claims 1 to 5.

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