Functional mixed spun yarn and functional fabric using the same

Abstract

To provide a functional mixed spun yarn having practically sufficient strength, and also to provide a fabric using the same.SOLUTION: A functional mixed spun yarn is formed by mixing cellulosic fibers (A) to which a compound having a functional group is grafted and cellulosic fibers (B) to which a compound having a functional group is not grafted. The ratio of the fibers (A) is 5 to 40 mass%. The ratio of the fibers (B) is 60 to 95 mass%. The mixed spun yarn is an air fine spun yarn, a siro-spun yarn, a compact spun yarn, or a compact siro-spun yarn.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a functional blended spun yarn and a functional fabric using the same. [Background technology]

[0002] Hygroscopic heat generation is the property of dry fabrics that generate heat when they absorb moisture (gaseous moisture), and is known as the phenomenon where, for example, if you bring a futon that has been exposed to the sun during the day into a room and after a few hours it has cooled to the same temperature as the room, it still feels warm when you put your skin against it.Undergarments and other innerwear worn during cold seasons are sold by a variety of companies, but they all have in common the fact that they utilize the hygroscopic heat generation function. Patent Document 1 proposes placing heat-generating fibers in the accessories of underwear. In Patent Document 2, the applicant proposes a fabric containing a specific proportion of heat-generating cellulose fibers. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2005-133243 [Patent Document 2] Patent Publication No. 2021-025135 Summary of the Invention [Problem to be solved by the invention]

[0004] However, the heat-generating processed cellulose fibers as disclosed in Patent Documents 1 and 2 have a problem of reduced strength, and further improvements have been desired.

[0005] In order to solve the above-mentioned problems of the prior art, the present invention provides a functional blended spun yarn having sufficient strength for practical use, and a functional fabric using the same. [Means for solving the problem]

[0006] One embodiment of the present invention is a functional blended spun yarn in which a cellulosic fiber (A) to which a compound having a functional group has been grafted and a cellulosic fiber (B) to which a compound having a functional group has not been grafted, the proportion of the cellulose-based fibers (A) to which a compound having a functional group has been grafted is 5 to 40 mass %, and the proportion of the cellulose-based fibers (B) to which a compound having a functional group has not been grafted is 60 to 95 mass %, The blended spun yarn relates to a functional blended spun yarn which is an air spun yarn, a sirospun yarn, a compact spun yarn or a compact sirospun yarn.

[0007] A functional fabric according to one embodiment of the present invention is a functional fabric comprising a functional blended spun yarn in which a cellulosic fiber (A) to which a compound having a functional functional group has been grafted and a cellulosic fiber (B) to which a compound having a functional functional group has not been grafted are blended, In the functional blended spun yarn, the proportion of the cellulosic fiber (A) to which a compound having a functional group has been grafted is 5 to 40 mass %, and the proportion of the cellulosic fiber (B) to which a compound having a functional group has not been grafted is 60 to 95 mass %, The blended spun yarn is an air spun yarn, a Sirospun yarn, a compact spun yarn or a compact Sirospun yarn, The functional fabric is a knitted fabric, and the knitting yarn constituting the functional fabric contains 70% by mass or more of the functional blended spun yarn.

[0008] A functional fabric according to one embodiment of the present invention is a functional fabric comprising a functional blended spun yarn in which a cellulosic fiber (A) to which a compound having a functional functional group has been grafted and a cellulosic fiber (B) to which a compound having a functional functional group has not been grafted are blended, In the functional blended spun yarn, the proportion of the cellulosic fiber (A) to which a compound having a functional group has been grafted is 5 to 40 mass %, and the proportion of the cellulosic fiber (B) to which a compound having a functional group has not been grafted is 60 to 95 mass %, The blended spun yarn is an air spun yarn, a Sirospun yarn, a compact spun yarn or a compact Sirospun yarn, The functional fabric is a knitted fabric, and the knitting yarn constituting the functional fabric is made of the functional blended yarn and an elastic yarn, and the functional fabric contains 70% by mass or more of the functional blended spun yarn. [Effects of the Invention]

[0009] The present invention makes it possible to compensate for the drawbacks of cellulose fiber (A) to which a compound having a functional functional group has been grafted, resulting in reduced strength, by uniformly blending it with cellulose-based fiber (B) to which a compound having a functional functional group has not been grafted, and by improving the yarn structure of the spun yarn, thereby producing a functional blended spun yarn with sufficient strength for practical use, and a functional fabric using the same. [Brief explanation of the drawings]

[0010] [Figure 1] FIG. 1A is a schematic side view of a spun twisted yarn according to one embodiment of the present invention, and FIG. 1B is a schematic cross-sectional view of the same. [Figure 2] FIG. 2 is a schematic side view of an air-spun yarn according to one embodiment of the present invention. [Figure 3] FIG. 3 is a schematic perspective view of a sirospun spinning device according to one embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0011] The present invention relates to a functional blended spun yarn in which a cellulosic fiber (A) to which a compound having a functional group has been grafted is blended with a cellulosic fiber (B) to which a compound having a functional group has not been grafted. The blending may be any type of blending, such as a cotton blending or a draw blending. The two component fibers are uniformly blended by blending.

[0012] The blend ratio is 5 to 40 mass% of cellulosic fiber (A) grafted with a compound having a functional group, and 60 to 95 mass% of cellulosic fiber (B) not grafted with a compound having a functional group. Preferably, the fiber (A) is 7 to 38 mass% and the fiber (B) is 62 to 93 mass%, and more preferably, the fiber (A) is 10 to 35 mass% and the fiber (B) is 65 to 90 mass%. If the fiber (A) is less than 5 mass%, functionality such as moisture absorption and heat generation is insufficient, while if the fiber (A) is more than 40 mass%, strength decreases significantly, both of which are undesirable.

[0013] The blended spun yarn is preferably air spun yarn, siro spun yarn, compact spun yarn, or compact siro spun yarn. Air spun yarn has the structure shown in Figure 2, which will be described later, while siro spun yarn and compact siro spun yarn have the structure shown in Figure 1, which will be described later. This yarn structure allows for a spun yarn with sufficient strength for practical use. Siro spun yarn and compact siro spun yarn are preferably made by twisting together two or three fiber bundles. Compact siro spun yarn can be produced by combining the manufacturing methods for siro spun yarn and compact spun yarn, which will be described later. Siro spun yarn is a yarn made by separately drafting multiple rovings at regular intervals and then twisting them together to form a two-ply yarn. Compared to two-ply yarns made by twisting multiple yarns together, siro spun yarn has a more regularly arranged fiber on the yarn surface and has less fuzz. Compact spun yarn can be produced using a Rieter spinning machine, a Chinsor spinning machine, a Sussen spinning machine, or a Toyota Automatic Loom Works spinning machine. In all cases, the fibers on the outside of the spun yarn are wrapped around the inside of the yarn, resulting in a yarn with little fuzz.

[0014] The blended spun yarn preferably has a British cotton count of 10 to 80. The finely spun blended yarn and compact spun yarn formed by twisting together a plurality of fiber bundles preferably have a twist coefficient K, as expressed by the following formula, of 2.8 to 6.0, more preferably 2.9 to 5.8, and even more preferably 3.0 to 5.5. The twist coefficient K is calculated using the following formula. K=t / √S Where t: number of twists per inch (2.54 cm), S: British cotton count. To convert British cotton count to the internationally used tex count, use the formula 590.5413 / British cotton count.

[0015] In the air spun yarn, the inner fibers are preferably arranged in the yarn length direction with a relatively small twist or parallel to the wrapping fibers in the surface layer, the wrapping fibers in the surface layer are twisted in one direction, and the wrapping fibers in the surface layer preferably bundle the inner fibers. This yarn structure allows for a spun yarn with sufficient strength for practical use.

[0016] The cellulosic fiber (A) grafted with a compound having a functional group is preferably a compound having an ethylenically unsaturated double bond. Examples of compounds having an ethylenically unsaturated double bond include compounds having one ethylenically unsaturated double bond and one or two carboxylic acid groups. Specifically, at least one carboxylic acid selected from acrylic acid, methacrylic acid, itaconic acid, maleic acid, and fumaric acid, or their esters or salts, is preferred. For example, chemically bonding a compound having a carboxylic acid group as a functional group to the surface of cotton can impart washability and moisture-absorbing heat-generating properties. The graft bond is formed through various reactions, including a reaction in which radicals are generated on the surface of the cellulosic fiber by irradiation with an electron beam, a reaction in which the generated radicals are grafted to the surface of the cellulosic fiber by contacting a compound having an ethylenically unsaturated double bond containing a functional group (-OH, -NH, etc.), and a reaction in which the active group reacts with a carboxylic acid group (-COOH) to form a covalent bond. The compound containing an ethylenically unsaturated double bond is preferably added in an amount of 1 to 30% by mass, more preferably 5 to 20% by mass, based on the cellulose fiber. Within this range, the cellulose fiber (B) can exhibit its moisture-absorbing and heat-generating function even when blended with the cellulose fiber (B) to which the compound having a functional group is not grafted.

[0017] Examples of functions that can be imparted to functional fibers include moisture absorption and heat generation, moisture absorption and release, quick drying, stain resistance, deodorization, etc. A compound having a functional group that provides the above functions can be selected.

[0018] The fabric of the present invention is a knitted product, and the knitting yarn constituting the functional fabric preferably contains 70% by mass or more of the functional blended spun yarn, more preferably 90% by mass or more, and even more preferably 100% by mass. Since the functional blended spun yarn of the present invention is less susceptible to strength reduction due to functional processing of cellulose fibers, the proportion of the functional blended spun yarn used in the fabric can be set high.

[0019] The knitting yarn constituting the functional fabric is composed of the functional blended yarn and elastic yarn, and preferably contains 70% by mass or more of the functional blended spun yarn, more preferably 85% by mass or more, and even more preferably 90% by mass or more. The functional blended spun yarn of the present invention is less susceptible to strength reduction due to functional processing of cellulose fibers, so the proportion of the functional blended spun yarn used in fabrics can be set high. The knitting yarn constituting the functional fabric is composed of the functional blended yarn and elastic yarn, and the proportion of the elastic yarn is preferably 3 to 15% by mass, more preferably 3 to 10% by mass.

[0020] The fabric of the present invention is a knitted product, and the knitting yarn constituting the functional fabric may be a mixture of the functional blended spun yarn and other yarns. For example, if three repeating units are used, one of which is the functional blended spun yarn containing 30% by mass of cellulosic fiber (A) grafted with a compound having a functional functional group, and the other two are untreated cotton spun yarns, a fabric containing 10% by mass of cellulosic fiber (A) grafted with a compound having a functional functional group is obtained, based on the fabric as 100% by mass. The ratio of repeating units to functional blended spun yarns can be 2:1, 3:2, 3:1, 4:1, 4:2, 4:3, or 4:3, etc.

[0021] The fabric of the present invention is preferably a knitted fabric, and knitted fabrics are suitable for use as innerwear. Knitted fabrics are stretchy and flexible, making them suitable for use as innerwear. Knitted fabrics include circular knitting, weft knitting, warp knitting (including tricot knitting and raschel knitting), pile knitting, etc., and may be of any weave such as plain knitting, jersey knitting, rib knitting, smooth knitting (double knitting), rib knitting, purl knitting, Denbigh knitting, cord knitting, atlas knitting, chain knitting, insertion knitting, and woven fabrics combining these. Various interlacing methods are used to produce knitted fabrics. Interlacing knitted fabrics may be warp knitting or weft knitting, and examples include tricot, raschel knitting, and circular knitting. Furthermore, knitted fabrics may be of any weave such as half knitting, reverse half knitting, double atlas knitting, double Denbigh knitting, and knitting combining these.

[0022] The mass per unit area of the fabric is 80 to 300 g / m 2 is preferable, and more preferably 90 to 250 g / m 2 and more preferably 100 to 200 g / m 2 If it is in the above range, it is suitable for use as innerwear.

[0023] In the present invention, cellulosic fibers refer to natural fibers such as cotton, kapok, and hemp, and regenerated fibers such as rayon, Bemberg, Tencel, and Lyocell.

[0024] The following description will be made with reference to the drawings, in which the same reference numerals denote the same parts. Fig. 1A is a schematic side view of a spun twisted yarn 1 according to one embodiment of the present invention, and Fig. 1B is a schematic cross-sectional view of the same. This spun twisted yarn 1 is composed of two fiber bundles 2a and 2b, which are twisted in the same direction and appear to be two strands, but are actually a single yarn.

[0025] Figure 2 is a schematic side view of an air spun yarn 3 according to one embodiment of the present invention. In this air spun yarn 3, the internal fibers 4 are aligned in the yarn length direction with relatively less twist than the wrapping fibers 5 in the surface layer, and the wrapping fibers 5 in the surface layer are twisted in one direction, forming a true twist. The wrapping fibers 5 in the surface layer bundle the internal fibers 4, resulting in a yarn with very little fuzz overall. This air spun yarn 3 can be produced using Murata Machinery Co., Ltd.'s No. 870 MURATA VORTEX SPINNER.

[0026] 3 is a schematic perspective view of a Sirospun spinning device according to one embodiment of the present invention. In this Sirospun spinning device 10, two roving bobbins 11a, 11b are hung per spindle on a creel (roving supplying device), and rovings 12a, 12b supplied from the two roving bobbins 11a, 11b are sent in parallel to a drafting device 15 through a two-mouth trumpet guide 13 provided upstream (on the roving bobbin side) of a back roller 14. The rovings 12a, 12b are then drafted at a predetermined interval between the back roller 14 and an apron 16, and between the apron 16 and a front roller 17, to form fleeces 18a, 18b. The fleeces 18a, 18b are then spun from the front roller 17 and twisted downstream of the front roller 17 by a twisting mechanism caused by the rotation of the spindle to form a single spun twisted yarn 19, which is then passed through a snail wire 20 and a traveler 21 and wound onto a bobbin 22. In this way, a Sirospun twisted yarn is produced. Compact spinning spinning machines include spinning machines using the Reeter method, the Chinsor method, the Sussen method, and the Toyota Industries method. In order to obtain yarn with less fuzz, some machines employ perforated curlers on the front and bottom rollers to improve fiber convergence in the drafting section, or use suction in the top and apron sections to remove fibers that have strayed from the fiber bundle, or incorporate a device that uses suction after the front roller to converge the fiber bundle. [Example]

[0027] The present invention will be specifically described below using examples, but the present invention is not limited to the following examples.

[0028] <Hygroscopic heat generation> (1) A sample of fabric (knitted fabric) is taken to a size of 20 cm x 20 cm, dried in a dryer for 4 hours, and left overnight in a desiccator containing silica gel. (2) The treated sample is folded in half, a thermocouple temperature sensor is attached to the center, and the sample is folded in half again to form a test specimen. (3) After treating the test specimen in a thermo-hygrostat under an environment of 20°C and 40% RH for 2 hours, change the thermo-hygrostat settings to 20°C and 90% RH, and measure the temperature change every minute for 15 minutes. Determine. (4) A knitted fabric (Comparative Example 1) made from 40-count cotton yarn using untreated cotton sliver is used as the reference fabric, and the difference between the maximum temperature of the reference fabric and the maximum temperature of the example fabric over the 15-minute measurement period is calculated as the maximum temperature difference (°C). <Single yarn strength, elongation> Measurement was carried out using a yarn strength tester ST-2000 (manufactured by Shikibo) in accordance with JIS L1095 9.5.1. <Worcester U%> Measurement was carried out according to JIS L1095 9.22.2 Method B using a USTER (registered trademark) TESTER 5 (manufactured by USTER). <Classimat> Measurement was carried out using a CLASSIMAT QUANTUM (manufactured by USTER). <Fluff> Measurement was carried out using a fluff measuring device, LASERSPOT (manufactured by Keisokuki Kogyo Co., Ltd.), in accordance with JIS L1095 9.22.2 B method.

[0029] Example 1 <Sliver processing> Cotton sliver (mass per unit length, unit grain: 25.0 g / 6 yd (4.6 g / m)) was irradiated with an electron beam at 40 kGy and an acceleration voltage of 200 kV under a nitrogen gas atmosphere using an electrocurtain-type electron beam irradiation device EC250 / 30 / 90L (manufactured by Iwasaki Electric Co., Ltd.). The irradiated sliver was immediately immersed in a 16% by weight aqueous solution of acrylic acid (manufactured by Nacalai Tesque, Inc.) containing 0.5% by weight of a penetrant and squeezed with a mangle to achieve a pickup rate of approximately 100% by weight of the sliver. The sliver was then washed with water to remove unreacted acrylic acid, dried at 80°C, and coiled and stored in a container. The sliver obtained in this manner is referred to as "treated cotton." This treated cotton contained 16% by weight of acrylic acid bound to it. <Spinning> 30% by weight of the treated cotton and 70% by weight of the untreated cotton were blended in a cotton blending process, and then passed through a carding machine to uniformly blend the materials. The blended materials were then drawn and roving-spun to obtain a roving. Two of these rovings were used to make a spun yarn with a cotton count of 40.35 (actual twist number 22.92 / inch) using a Sirospun spinning machine as shown in Figure 3.

[0030] Example 2 The same procedure as in Example 1 was carried out except that two rovings used in Example 1 were used to make a finely spun twisted yarn having a cotton count of 40.3 on a compact spinning machine.

[0031] Example 3 The same procedure as in Example 1 was carried out except that two rovings used in Example 1 were used to make a finely spun twisted yarn having a cotton count of 39.63 on a compact sirospun spinning machine.

[0032] Example 4 The same procedure as in Example 3 was carried out, except that 10% by weight of treated cotton and 90% by weight of untreated cotton were used. <Knitting> The sirospun yarn and polyurethane elastic yarn (22decitex) were used, and the polyurethane elastic yarn was 8% by mass, and the yarn was fed to an 18-gauge circular knitting machine to knit a plain knit fabric. The knitted fabric had a mass per unit area of 152 g / m 2 It was. The Sirospun yarn was also fed to an 18-gauge circular knitting machine to knit a plain knit fabric. The knit fabric had a mass per unit area of 140 g / m 2 It was. <Bleaching, dyeing> The resulting knitted fabric was bleached and dyed in the usual manner. <Sewing> Using the two types of knitted fabric obtained in this way, two types of long-sleeved shirts for innerwear were sewn. The one using elastic yarn was placed around the body and sewn. The weight of one shirt was 145g for a men's size L.

[0033] Example 5 The same procedure as in Example 1 was carried out, except that one roving made of 10% by weight of treated cotton and 90% by weight of untreated cotton was used to make air-spun yarn with a cotton count of 39.54 using a Murata Machinery Co., Ltd. product name "No. 870, MURATA VORTEX SPINNER."

[0034] (Comparative Example 1) The same procedure as in Example 1 was carried out, except that 100% by weight of untreated cotton was used and one roving was used to form a ring-spun yarn using a ring spinning machine.

[0035] (Comparative Example 2) The same procedure as in Comparative Example 1 was carried out except that one roving used in Example 1 was used to form a ring-spun yarn using a ring spinning frame.

[0036] (Comparative Example 3) The same procedure as in Comparative Example 1 was carried out, except that the treated cotton was 10% by weight and the untreated cotton was 90% by weight. The above results are summarized in Tables 1 and 2.

[0037] [Table 1] [Table 2]

[0038] As shown in Tables 1 and 2, it was confirmed that the yarns of Examples 1 to 5 were functional blended spun yarns with sufficient strength for practical use. Furthermore, when an undershirt was sewn using the yarns of Examples 1 to 5 and subjected to a wearing test, it was confirmed that the shirt had high moisture absorption and heat generation properties, was comfortable to wear, and was gentle on the skin. [Industrial Applicability]

[0039] The functional blended spun yarn of the present invention, the fabric using the same, and the clothing using the same are suitable for innerwear such as shirts, pants, etc. Furthermore, since they are gentle on the skin, they are also suitable for T-shirts and the like. [Explanation of symbols]

[0040] 1. Spun and twisted yarn 2a,2b Fiber bundle 3. Air-spun yarn 4. Internal Fiber 5 Surface wrapped fibers 10 Sirospun spinning device 11a, 11b roving bobbin 12a,12b roving 13 Trumpet Guide 14 Back roller 15 Draft device 16 Apron 17 Front roller 18a, 18b fleece 19. Mixed twist yarn 20 Snell Wire 21 Traveler 22 Bobbin

Claims

1. A functional blended spun yarn in which a cellulosic fiber (A) to which a compound having a functional group has been grafted and a cellulosic fiber (B) to which a compound having a functional group has not been grafted, the proportion of the cellulose-based fibers (A) to which a compound having a functional group has been grafted is 5 to 40 mass %, and the proportion of the cellulose-based fibers (B) to which a compound having a functional group has not been grafted is 60 to 95 mass %, The functional blended spun yarn is characterized in that the blended spun yarn is air spun yarn, sirospun yarn, compact spun yarn or compact sirospun yarn.

2. 2. The functional blended spun yarn according to claim 1, wherein the cellulosic fiber (A) to which the compound having a functional group is grafted is a compound containing an ethylenically unsaturated double bond.

3. 3. The functional blended spun yarn according to claim 1, wherein the cellulosic fiber (A) to which the compound having a functional group is graft-bonded is acrylic acid or methacrylic acid.

4. A functional fabric comprising a functional blended spun yarn in which a cellulosic fiber (A) to which a compound having a functional functional group has been grafted and a cellulosic fiber (B) to which a compound having a functional functional group has not been grafted are blended, In the functional blended spun yarn, the proportion of the cellulosic fiber (A) to which a compound having a functional functional group has been grafted is 5 to 40 mass %, and the proportion of the cellulosic fiber (B) to which a compound having a functional functional group has not been grafted is 60 to 95 mass %, The blended spun yarn is an air spun yarn, a Sirospun yarn, a compact spun yarn or a compact Sirospun yarn, The functional fabric is a knitted fabric, and the knitting yarn constituting the functional fabric contains 70% by mass or more of the functional blended spun yarn. A functional fabric characterized by:

5. A functional fabric comprising a functional blended spun yarn in which a cellulosic fiber (A) to which a compound having a functional functional group has been grafted and a cellulosic fiber (B) to which a compound having a functional functional group has not been grafted are blended, In the functional blended spun yarn, the proportion of the cellulosic fiber (A) to which a compound having a functional functional group has been grafted is 5 to 40 mass %, and the proportion of the cellulosic fiber (B) to which a compound having a functional functional group has not been grafted is 60 to 95 mass %, The blended spun yarn is an air spun yarn, a Sirospun yarn, a compact spun yarn or a compact Sirospun yarn, The functional fabric is a knitted fabric, and the knitting yarn constituting the functional fabric is made of the functional blended yarn and an elastic yarn, and contains the functional blended spun yarn in an amount of 70% by mass or more. A functional fabric characterized by

6. The functional fabric is a circular knit fabric having a mass per unit area of 80 to 300 g / m 2 The functional fabric according to claim 4 or 5.

7. The functional fabric according to claim 4 or 5, wherein the functional fabric is a fabric for innerwear.

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