Moisture absorbing exothermic fabric manufacturing method

Abstract

To provide moisture absorbing exothermic clothing that has excellent adhesion to a body and good wearing feeling and is mild for the skin by improving moisture absorbing exothermic property of a cotton fabric.SOLUTION: Moisture absorbing fabric and moisture absorbing clothing of the invention include: a mixed spun yarn (A) including a cellulosic fiber (a1) subjected to moisture absorbing exothermic processing and a cellulosic fiber (a2) not subjected to the moisture absorbing exothermic processing; and a spun yarn (B1) constituted of the cellulosic fiber not subjected to the moisture absorbing exothermic processing. When the fabric is 100 mass%, the cellulosic fiber (a1) subjected to the moisture absorbing exothermic processing is 5 to 40 mass%. The moisture absorbing fabric and the moisture absorbing clothing may include 3 to 15 mass% of an elastic yarn (C).SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a moisture-absorbing, heat-generating fabric whose main fiber yarn is a cellulosic fiber such as cotton, and to a moisture-absorbing, heat-generating garment using the same. [Background technology]

[0002] Hygroscopic heat generation is the property of dry fibers generating heat when they absorb moisture (water). For example, if you bring a futon that has been exposed to the sun during the day into a room, even if it has cooled to the same temperature as the room after a few hours, it will still feel warm when you place your skin against it.

[0003] Conventionally, as a method for producing moisture absorbing and heat generating fibers, the following Patent Document 1 has proposed a highly moisture absorbing and releasing fiber obtained by subjecting acrylic fibers to hydrazine crosslinking treatment, hydrolysis treatment, and conversion of carboxyl groups to salt forms. However, these proposals are modifications of the acrylic fibers themselves, and it is difficult to apply them to other fibers. The applicant has also proposed a composite spun yarn in which animal hair fibers are used as the core component and cellulose fibers or the like are arranged as the sheath component (see Patent Document 2 below). [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2003-089971 A [Patent Document 2] Patent No. 3889652 Summary of the Invention [Problem to be solved by the invention]

[0005] In recent years, cotton has been rediscovered as a material for innerwear such as underwear, and there is a demand from the market for cotton itself to absorb moisture and generate heat, but conventional technology has not been able to meet this demand. To solve the above-mentioned problems of the conventional art, the present invention provides a moisture-absorbing and heat-generating fabric and clothing which improve the moisture-absorbing and heat-generating properties of cotton fabric, have good adhesion to the body, are comfortable to wear, and are gentle on the skin. [Means for solving the problem]

[0006] The first moisture-absorbing and heat-generating fabric of the present invention is a moisture-absorbing and heat-generating fabric comprising a blended spun yarn (A) containing a cellulose-based fiber (a1) that has been treated to absorb moisture and generate heat and a cellulose-based fiber (a2) that has not been treated to absorb moisture and generate heat, and a spun yarn (B1) composed of a cellulose-based fiber that has not been treated to absorb moisture and generate heat, wherein when the fabric is taken as 100% by mass, the cellulose-based fiber (a1) that has been treated to absorb moisture and generate heat is 5 to 40% by mass.

[0007] The second moisture-absorbing and heat-generating fabric of the present invention is a moisture-absorbing and heat-generating fabric comprising a blended spun yarn (A) containing cellulosic fibers (a1) that have been treated to absorb moisture and generate heat and cellulosic fibers (a2) that have not been treated to absorb moisture and generate heat, a spun yarn (B) composed of cellulosic fibers that have not been treated to absorb moisture and generate heat, and an elastic yarn (C), wherein the moisture-absorbing and heat-generating cellulosic fibers (a1) account for 5 to 40 mass% of the fabric as 100 mass%. The present invention further provides a moisture-absorbing, heat-generating fabric comprising a blended spun yarn (A) containing a cellulose-based fiber (a1) that has been moisture-absorbing and heat-generating processed and a cellulose-based fiber (a2) that has not been moisture-absorbing and heat-generating processed, a spun yarn (B) composed of a cellulose-based fiber that has not been moisture-absorbing and heat-generating processed, and an elastic yarn (C), wherein, when the fabric is taken as 100% by mass, the moisture-absorbing and heat-generating processed cellulose-based fiber (a1) is contained in an amount of 5 to 40% by mass, the total amount of the cellulose-based fibers (A+B) is 85 to 97% by mass, and the elastic yarn (C) is contained in an amount of 3 to 15% by mass.

[0008] A first moisture-absorbing, heat-generating garment of the present invention is a garment sewn from the first moisture-absorbing, heat-generating fabric. A second moisture-absorbing heat-generating garment of the present invention is a garment sewn from the second moisture-absorbing heat-generating fabric, characterized in that the elastic threads are arranged in a circumferential direction of the body. Effect of the Invention

[0009] The first and second moisture-absorbing and heat-generating fabrics and the first and second clothing of the present invention contain 5 to 40 mass % of the moisture-absorbing and heat-generating cellulosic fiber, which improves the moisture-absorbing and heat-generating properties of the cotton fabric and provides moisture-absorbing and heat-generating fabrics and clothing that are comfortable to wear and gentle on the skin, while also having good adhesion to the body. [Brief description of the drawings]

[0010] [Figure 1] FIG. 1 is a front view of an inner garment according to one embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] The present invention relates to a moisture-absorbing, heat-generating fabric comprising a blended spun yarn (A) containing a cellulose-based fiber (a1) that has been moisture-absorbing and heat-generating processed and a cellulose-based fiber (a2) that has not been moisture-absorbing and heat-generating processed, and a spun yarn (B) composed of a cellulose-based fiber that has not been moisture-absorbing and heat-generating processed. When the fabric is taken as 100% by mass, the moisture-absorbing and heat-generating processed cellulose-based fiber (a1) is 5 to 40% by mass. Cellulosic fibers such as cotton and rayon have moisture-absorbing and heat-generating properties (Tatsuya Motomiya et al., "Encyclopedia of Fibers," p. 830, left column, March 25, 2002, Maruzen), which imparts appropriate moisture-absorbing and heat-generating properties and allows the realization of moisture-absorbing and heat-generating clothing that is durable to washing. Furthermore, the present invention provides a moisture-absorbing heat-generating fabric that includes blended spun yarn (A) containing cellulose-based fiber (a1) that has been moisture-absorbing and heat-generating processed and cellulose-based fiber (a2) that has not been moisture-absorbing and heat-generating processed, spun yarn (B) composed of cellulose-based fiber that has not been moisture-absorbing and heat-generating processed, and elastic yarn (C), in which, when the fabric is taken as 100% by mass, the moisture-absorbing and heat-generating processed cellulose-based fiber (a1) is 5 to 40% by mass, the total amount of cellulose-based fiber (A+B) is 85 to 97% by mass, and the elastic yarn (C) is 3 to 15% by mass. This provides a moisture-absorbing and heat-generating garment that has appropriate moisture-absorbing and heat-generating properties and does not easily lose its shape even after repeated washing.

[0012] In addition, by mixing 5 to 40% by mass of the moisture-absorbing heat-generating processed cellulose fiber (a1), damage to the cellulose fiber during moisture-absorbing heat-generating processing can be compensated for by the untreated cellulose fiber. When the fabric is taken as 100% by mass, the moisture-absorbing heat-generating processed cellulose fiber (a1) is preferably 5 to 30% by mass, more preferably 6 to 20% by mass. In addition, the ratio of the total amount of cotton (A+B):elastic yarn is preferably 88:12 to 94:6 by mass, more preferably 90:10 to 95:5.

[0013] The cellulose-based fiber (a1) that has been subjected to moisture absorption and heat generation processing is preferably a cellulose-based fiber to which a compound containing an ethylenically unsaturated double bond (a compound having a functional group with moisture absorption and heat generation properties) has been grafted. Examples of the compound containing an ethylenically unsaturated double bond include a compound containing 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 an ester or salt thereof is preferable. When these compounds are chemically bonded to the cotton surface, it is possible to impart a moisture absorption and heat generation function with washability. The grafting is performed by a reaction in which radicals are generated on the surface of the cellulose-based fiber by irradiation with an electron beam, and functional groups (-OH, -NH 2 The formation of the cellulose-based fiber involves various reactions, such as a reaction of contacting a compound having an ethylenically unsaturated double bond containing a cellulose-based fiber with the cellulose-based fiber to graft the active group onto the surface of the fiber, and a reaction of the active group reacting 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 amount of the fiber. If the amount is within the above range, the cellulose-based fiber can exhibit its moisture absorbing heat generating function even when it is blended with untreated cotton.

[0014] In a blended spun yarn (A) containing cellulosic fibers (a1) that have been subjected to moisture absorption and heat generation processing and cellulosic fibers (a2) that have not been subjected to moisture absorption and heat generation processing, (a1) is usually 8 to 50 mass% and (a2) is 50 to 92 mass%, preferably (a1) is 10 to 45 mass% and (a2) is 55 to 90 mass%.

[0015] The moisture-absorbing heat-generating fabric of the present invention contains the blended spun yarn (A) and a spun yarn (B) composed of cellulosic fibers that have not been treated for moisture absorption and heat generation. For example, in the case of a knitted fabric suitable for innerwear, if three repeating units are used, one of which is the blended spun yarn (A) containing 30% by mass of (a1) and the other two are untreated cotton spun yarn (B), then a fabric containing 10% by mass of the moisture-absorbing heat-generating cellulosic fibers (a1) is obtained when the fabric is taken as 100% by mass.

[0016] The fabric is preferably a knitted fabric or a woven fabric. Knitted fabrics and woven fabrics are suitable for use as innerwear. Knitted fabrics are particularly suitable for use as innerwear because they are stretchy and flexible. It is preferable that one or two of every three yarns constituting the fabric are the blended spun yarns, and the remaining yarns are cotton spun yarns that are not subjected to moisture absorption and heat generation processing. Knitted fabrics may be of any weave structure, including circular knitting, weft knitting, warp knitting (including tricot knitting and raschel knitting), pile knitting, etc., plain knitting, plain knitting, rib knitting, smooth knitting (double-sided knitting), rubber knitting, pearl knitting, Denbigh weave, cord weave, atlas weave, chain weave, insertion weave, and weaves combining these. Various interlacing methods are used to produce knitted fabrics. Interlacing knitted fabrics may be warp knitting or weft knitting, and examples of such include tricot, raschel, and circular knitting. In addition, the knitting structure may be of any weave structure, including half knitting, reverse half knitting, double atlas knitting, double Denbigh knitting, and weaves combining these. Examples of the weave include plain weave, twill weave, satin weave, variegated plain weave, variegated twill weave, variegated satin weave, variegated weave, patterned weave, single layer weave, double weave, multi-layer weave, warp pile weave, weft pile weave, leno weave, and combinations of these. Among these, weft knitted fabrics including circular knitting, and warp knitted fabrics are preferred.

[0017] The mass per unit area of ​​the fabric is 80 to 300 g / m2 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.

[0018] The elastic yarn is preferably at least one selected from polyurethane yarn and conjugate yarn obtained by conjugating at least two kinds of polymers having different shrinkage rates. The polyurethane elastic yarn may be any one that uses polymer diol and diisocyanate as starting materials, and is not particularly limited. The conjugate yarn is a conjugate yarn obtained by conjugating at least two kinds of polymers having different shrinkage rates, and it exhibits crimp (shrinkage) from the raw yarn stage, but when heat is applied, it exhibits even greater crimp (shrinkage). Specifically, a conjugate yarn (bicomponent yarn) of polyethylene terephthalate (PET) and polytrimethylene terephthalate (PTT) is preferable. Examples of such latent crimp-type stretch yarn include "Lycra T400" manufactured by Toray Opelontex Co., Ltd., "Espandee" manufactured by KB Seiren Co., Ltd., and "Z10" manufactured by Unitika Co., Ltd. The elastic yarn that is usually used is polyurethane yarn.

[0019] For example, in the case of weft-knitted or circular-knitted fabrics, it is preferable to insert bare spandex yarn as a plating yarn for loop yarn, and in the case of warp-knitted fabrics, bare spandex yarn is inserted by insertion weaving or weft insertion. In the case of so-called innerwear, circular knitting is usually adopted, and elastic yarn, especially polyurethane elastic yarn, is used as a plating yarn for loop yarn. Polyurethane elastic yarn is usually inserted as a plating yarn in a state where it is stretched to about 2.5 times its original size, with a yarn of 20 to 40 decitex.

[0020] In clothing sewn with the moisture-absorbing and heat-generating fabric of the present invention, the elastic threads are arranged in the circumferential direction of the body. A so-called one-way stretch fabric is preferable. The circumferential direction of the body refers to the circumferential direction of the torso and the circumferential direction of the arms. This results in inner clothing that is comfortable to wear and does not easily lose its shape even after repeated washing. This clothing is preferably a shirt or pants. The inner clothing of the present invention is made of 85% by mass or more, preferably 88% by mass or more, and more preferably 90% by mass or more of cotton as the main fiber, and is gentle on the skin.

[0021] Next, the manufacturing method of the present invention will be described by taking as an example a case where cotton (natural cellulose fiber) is used as the cellulose-based fiber. In the case of a continuous method, a cotton sliver for spinning is irradiated with an electron beam under a nitrogen atmosphere to generate radicals on the surface of the cotton fiber, and immediately thereafter, a compound containing an ethylenically unsaturated double bond is continuously brought into contact with the surface of the cotton fiber. The reason why the compound containing an ethylenically unsaturated double bond is brought into contact with the surface of the cotton fiber immediately after the electron beam irradiation is to prevent the radicals generated by the electron beam irradiation from decaying. Since radicals have a high tendency to decay over time, it is preferable to bring the compound containing an ethylenically unsaturated double bond into contact with the surface of the cotton fiber immediately after the electron beam irradiation. In addition, it is preferable to continuously bring the compound containing an ethylenically unsaturated double bond into contact with the surface of the cotton fiber after the electron beam irradiation, because the compound containing an ethylenically unsaturated double bond can be effectively brought into contact with the radicals generated on the surface of the cotton fiber. Furthermore, carrying out the process continuously is convenient for treating a long sliver for spinning. Furthermore, it is preferable to irradiate the electron beam under a nitrogen atmosphere, because the generated radicals are less likely to be deactivated.

[0022] The method for contacting the surface of the cotton fiber with the compound containing an ethylenically unsaturated double bond may be any method such as immersion or spraying. For example, it is preferable to prepare an aqueous solution of the compound containing an ethylenically unsaturated double bond, and then immerse the sliver in the aqueous solution or spray the aqueous solution onto the sliver.

[0023] In the present invention, the treated spinning sliver is blended with other untreated slivers and then spun to obtain a spun yarn having a moisture absorbing and heat generating function. Blending is usually preferably performed by a drawing process including a doubling process. However, it can also be performed by a carding process, a roving process, or a spinning process, and the blending can be performed by drawing together a plurality of webs, slivers, fleeces, or roving yarns and stretching them to a predetermined ratio. In the roving or spinning process, blending can be performed by migration of the constituent fibers during twisting. Furthermore, the treated spinning sliver can be returned to the blending and spun process to obtain the desired blend ratio.

[0024] After blending the cotton that has been treated to absorb moisture and generate heat with cotton that has not been treated to absorb moisture and generate heat, the blended spun yarn (A) is made according to a conventional method. The spun yarn of cotton that has not been treated to absorb moisture and generate heat is also made into spun yarn (B) according to a conventional method. The blended spun yarn (A), spun yarn (B) and elastic yarn (C) are used in predetermined amounts to make a moisture-absorbing heat-generating fabric. This fabric can be optionally post-processed, such as bleached, dyed and softened, according to conventional methods.

[0025] 1 is a front view of an inner garment 1 according to one embodiment of the present invention. The inner garment 1 is an example of a long-sleeved shirt. Elastic yarns are arranged in the circumferential direction of the body, i.e., in the circumferential direction of the torso (arrow 2) and in the circumferential direction of the arms (arrow 3). EXAMPLES

[0026] The present invention will be described in more detail below with reference to examples, although the present invention is not limited to the following examples.

[0027] <Hygroscopic heat generation> (1) Take a sample of fabric (knitted fabric) measuring 20 cm x 20 cm, dry it in a dryer for 4 hours, and leave it in a desiccator containing silica gel overnight. (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 create a test specimen. (3) After subjecting the test specimen to an environment of 20°C and 40% RH for two hours using a thermo-hygrostat, the settings of the thermo-hygrostat are changed to 20°C and 90% RH, and the temperature change is measured every minute for 15 minutes. (4) A knitted fabric made of 50-count cotton yarn using untreated cotton sliver (Comparative Example 1) 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).

[0028] Example 1 <Sliver processing> A cotton sliver (mass per unit length, unit grain: 25.0 g / 6 yd (4.6 g / m)) was irradiated with electron beams at 15 kGy four times using an electrocurtain type electron beam irradiation device EC250 / 30 / 90L (manufactured by Iwasaki Electric Co., Ltd.). Immediately after the electron beam irradiation, the sliver was immersed in a 32 mass% aqueous solution of acrylic acid (manufactured by Nacalai Tesque Co., Ltd.) containing 0.4 wt% of a penetrant, and squeezed with a mangle to obtain a pickup rate of about 100 mass% based on the sliver weight. Next, the sliver was continuously heat-treated with steam at 100°C for 10 minutes. Next, the sliver was continuously washed with water to remove unreacted acrylic acid, then dried at 80°C, coiled and stored in a container. The sliver obtained in this manner is called "treated cotton". 8 mass% of acrylic acid was bonded to this treated cotton. <Spun yarn> (1) Blended yarn containing treated cotton The treated cotton and untreated cotton were blended in a blending process to spin a yarn having a cotton count of 50. The proportion of treated cotton in the blended yarn was 30% by weight. (2) Untreated cotton yarn Untreated cotton slivers were used to spin yarn with a cotton count of 50. <Knitting> The treated cotton blended yarn, untreated cotton spun yarn, and elastic yarn were used as the feed yarns in a ratio of 2 untreated cotton spun yarns to 1 treated cotton blended yarn, and a plain knit fabric was knitted using a circular knitting machine. The proportion of treated cotton in the fabric was 10% by mass. <Bleaching, dyeing> The resulting knitted fabric was bleached and dyed in the usual manner. <Sewing> The knitted fabric obtained in this manner was used to sew a long-sleeved shirt as innerwear. The elastic yarn was sewn in a circumferential direction of the body. The long-sleeved shirt as innerwear obtained is shown in Figure 1. The weight of one shirt was 145g for a men's L size.

[0029] Example 2 <Spun yarn> The spun yarn containing the treated cotton used in Example 1 and untreated cotton spun yarn were used. <Elastic thread> A commercially available polyurethane elastic thread of 22 decitex product was used. <Knitting> The blended yarn containing the treated cotton, the untreated cotton spun yarn, and the elastic yarn were used, and the blended yarn containing the treated cotton was fed in a ratio of two untreated cotton spun yarns to one treated cotton yarn, and the elastic yarn was inserted so that it accounted for 7% by mass of the fabric. The elastic yarn was inserted as a supplementary yarn to each yarn so that it accounted for 7% by mass of the fabric, with tension applied so that it was stretched 2.5 times. A plain knit fabric was knitted using a circular knitting machine. <Bleaching, dyeing> The resulting knitted fabric was bleached and dyed in the usual manner. <Sewing> The knitted fabric obtained in this manner was used to sew a long-sleeved shirt as innerwear. The elastic yarn was sewn in a circumferential direction of the body. The long-sleeved shirt as innerwear obtained is shown in Figure 1. The weight of one shirt was 170g for a men's size L.

[0030] Example 3 The blended yarn containing the treated cotton of Example 1, the untreated cotton spun yarn, and the elastic yarn were used as the feed yarns in a ratio of one untreated cotton spun yarn to two blended yarns containing the treated cotton, and a plain knit fabric was knitted using a circular knitting machine. The proportion of treated cotton in the fabric was 20% by mass.

[0031] Comparative Example 1 The same procedure as in Example 1 was carried out, except that no treated cotton was used. The above results are summarized in Table 1.

[0032] [Table 1]

[0033] As is clear from Table 1, Examples 1 to 3 had high moisture absorption and heat generation properties. In addition, a wearing test confirmed that Examples 2 and 3 had good adhesion to the body, were comfortable to wear, and were gentle on the skin. [Industrial Applicability]

[0034] The moisture-absorbing heat-generating fabric of the present invention and the moisture-absorbing heat-generating clothing using the same are suitable for innerwear such as shirts, pants, etc. Also, since it is gentle on the skin, it is suitable for T-shirts, etc. [Explanation of symbols]

[0035] 1. Innerwear 2. Around the fuselage 3 Arm circumference

Claims

1. A method for manufacturing moisture-absorbing and heat-generating fabric, A method for manufacturing a moisture-absorbing and heat-generating fabric, comprising a blended spun yarn (A) containing moisture-absorbing and heat-generating processed cotton fibers (a1) and cotton fibers that have not been treated with moisture-absorbing and heat-generating processing (a2), and a spun yarn (B) composed of cotton fibers that have not been treated with moisture-absorbing and heat-generating processing. The aforementioned moisture-absorbing, heat-generating fabric is a knitted fabric. The aforementioned moisture-absorbing and heat-generating cotton fiber (a1) is a cotton fiber in which a compound having a functional group containing an ethylenically unsaturated double bond and exhibiting moisture-absorbing and heat-generating properties is grafted. The ratio of the number of strands of the blended spun yarn (A) to the spun yarn (B) is such that 1 to 2 strands of the blended spun yarn (A) are used for every 3 strands of yarn, and the remaining strands are used for the spun yarn (B), and the knitted fabric is then knitted. When the moisture-absorbing and heat-generating fabric is considered to be 100% by mass, the moisture-absorbing and heat-generating processed cotton fibers (a1) constitute 5 to 40% by mass. In the aforementioned blended spun yarn (A), the amount of moisture-absorbing and heat-generating treated cotton fibers (a1) is 10 to 45% by mass, and the amount of cotton fibers (a2) that have not undergone moisture-absorbing and heat-generating treatment is 55 to 90% by mass. A method for manufacturing a moisture-absorbing and heat-generating fabric, wherein when the moisture-absorbing and heat-generating fabric is considered to be 100% by mass, the moisture-absorbing and heat-generating processed cotton fibers (a1) constitute 5 to 40% by mass, and the remainder is the unprocessed moisture-absorbing and heat-generating cotton fibers (a2).

2. A method for manufacturing moisture-absorbing and heat-generating fabric, A method for manufacturing a moisture-absorbing and heat-generating fabric, comprising a blended spun yarn (A) containing moisture-absorbing and heat-generating processed cotton fibers (a1) and cotton fibers that have not been treated with moisture-absorbing and heat-generating processing (a2), and a spun yarn (B) composed of cotton fibers that have not been treated with moisture-absorbing and heat-generating processing. The aforementioned moisture-absorbing, heat-generating fabric is a knitted fabric. The aforementioned moisture-absorbing and heat-generating cotton fiber (a1) is a cotton fiber in which a compound having a functional group containing an ethylenically unsaturated double bond and exhibiting moisture-absorbing and heat-generating properties is grafted. The knitted fabric is prepared by setting the ratio of the number of strands of the blended spun yarn (A) to the spun yarn (B) to 1:2 to 2:

1. When the moisture-absorbing and heat-generating fabric is considered to be 100% by mass, the moisture-absorbing and heat-generating processed cotton fibers (a1) constitute 5 to 40% by mass. In the aforementioned blended spun yarn (A), the amount of moisture-absorbing and heat-generating treated cotton fibers (a1) is 10 to 45% by mass, and the amount of cotton fibers (a2) that have not undergone moisture-absorbing and heat-generating treatment is 55 to 90% by mass. A method for manufacturing a moisture-absorbing and heat-generating fabric, wherein when the moisture-absorbing and heat-generating fabric is considered to be 100% by mass, the moisture-absorbing and heat-generating processed cotton fibers (a1) constitute 5 to 40% by mass, and the remainder is the unprocessed moisture-absorbing and heat-generating cotton fibers (a2).

3. A method for manufacturing a moisture-absorbing and heat-generating fabric, A method for manufacturing a moisture-absorbing and heat-generating fabric, comprising a blended spun yarn (A) containing moisture-absorbing and heat-generating processed cotton fibers (a1) and cotton fibers that have not been treated with moisture-absorbing and heat-generating processing (a2), and a spun yarn (B) composed of cotton fibers that have not been treated with moisture-absorbing and heat-generating processing. The aforementioned moisture-absorbing, heat-generating fabric is a knitted fabric. The aforementioned moisture-absorbing and heat-generating cotton fiber (a1) is a cotton fiber in which a compound having a functional group containing an ethylenically unsaturated double bond and exhibiting moisture-absorbing and heat-generating properties is grafted. The ratio of the number of strands of the blended spun yarn (A) to the spun yarn (B) is such that 1 to 2 strands of the blended spun yarn (A) are used for every 3 strands of yarn, and the remaining strands are used for the spun yarn (B), and the knitted fabric is then knitted. When the moisture-absorbing and heat-generating fabric is considered to be 100% by mass, the moisture-absorbing and heat-generating processed cotton fibers (a1) constitute 5 to 40% by mass. In the aforementioned blended spun yarn (A), the amount of moisture-absorbing and heat-generating treated cotton fibers (a1) is 10 to 45% by mass, and the amount of cotton fibers (a2) that have not undergone moisture-absorbing and heat-generating treatment is 55 to 90% by mass. The aforementioned moisture-absorbing and heat-generating fabric contains elastic yarn, A method for manufacturing a moisture-absorbing, heat-generating fabric, wherein when the moisture-absorbing, heat-generating fabric is considered to be 100% by mass, the moisture-absorbing, heat-generating processed cotton fibers (a1) constitute 5 to 40% by mass, the remainder consists of the unprocessed, unprocessed cotton fibers (a2) and the elastic yarn, the total amount of the blended spun yarn (A) and the spun yarn (B) is 85 to 97% by mass, and the elastic yarn constitutes 3 to 15% by mass.

4. A method for manufacturing a moisture-absorbing and heat-generating fabric, A method for manufacturing a moisture-absorbing and heat-generating fabric, comprising a blended spun yarn (A) containing moisture-absorbing and heat-generating processed cotton fibers (a1) and cotton fibers that have not been treated with moisture-absorbing and heat-generating processing (a2), and a spun yarn (B) composed of cotton fibers that have not been treated with moisture-absorbing and heat-generating processing. The aforementioned moisture-absorbing, heat-generating fabric is a knitted fabric. The aforementioned moisture-absorbing and heat-generating cotton fiber (a1) is a cotton fiber in which a compound having a functional group containing an ethylenically unsaturated double bond and exhibiting moisture-absorbing and heat-generating properties is grafted. The knitted fabric is prepared by setting the ratio of the number of strands of the blended spun yarn (A) to the spun yarn (B) to 1:2 to 2:

1. When the moisture-absorbing and heat-generating fabric is considered to be 100% by mass, the moisture-absorbing and heat-generating processed cotton fibers (a1) constitute 5 to 40% by mass. In the aforementioned blended spun yarn (A), the amount of moisture-absorbing and heat-generating treated cotton fibers (a1) is 10 to 45% by mass, and the amount of cotton fibers (a2) that have not undergone moisture-absorbing and heat-generating treatment is 55 to 90% by mass. The aforementioned moisture-absorbing and heat-generating fabric contains elastic yarn, A method for manufacturing a moisture-absorbing, heat-generating fabric, wherein when the moisture-absorbing, heat-generating fabric is considered to be 100% by mass, the moisture-absorbing, heat-generating processed cotton fibers (a1) constitute 5 to 40% by mass, the remainder consists of the unprocessed, unprocessed cotton fibers (a2) and the elastic yarn, the total amount of the blended spun yarn (A) and the spun yarn (B) is 85 to 97% by mass, and the elastic yarn constitutes 3 to 15% by mass.

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