Knitted fabric, and production method of dyed knitted fabric using the same

Abstract

To provide a knitted fabric hard to reduce uniform dying property, and a production method of a dyed knitted fabric using the same.SOLUTION: A knitted fabric of the present invention in one embodiment includes: a mixed spun yarn (A) including a modified cellulosic fiber, and a regular cellulosic fiber; a spun yarn (B) including a regular cellulosic fiber; and a polyurethane elastic yarn, where the modified cellulosic fiber is obtained by introducing an ethylenic double bond, and a carboxyl group (-COOH) or a salt thereof to a regular cellulosic fiber, and the polyurethane elastic yarn can be heat-set at a temperature of lower than 180°C. The mass ratio of the modified cellulosic fiber included in the knitted fabric is preferably 3-30 mass% on the basis of total 100 mass% of mass ratios of the modified cellulosic fiber, the regular cellulosic fiber, and the polyurethane elastic yarn.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a knitted fabric containing a polyurethane elastic yarn and a method for producing a dyed knitted fabric using the same. [Background technology]

[0002] Cellulosic fibers such as cotton and rayon are highly absorbent and are used as materials for various clothing such as innerwear because they are comfortable to wear. In recent years, cellulose fibers have also been treated to absorb moisture and generate heat. Moisture absorption and heat generation is the property of dry fibers generating heat when they absorb moisture (water). For example, when a futon that has been exposed to the sun during the day is brought indoors and the temperature has risen to the same as the room temperature after a few hours, it feels warm when placed against the skin of the human body.

[0003] The present applicant has proposed modified cellulose-based fibers in which an ethylenically unsaturated double bond and a carboxyl group (-COOH) or its salt are introduced into cellulose-based fibers as a method for imparting moisture absorbing and heat generating properties to cellulose-based fibers (Patent Documents 1-2). [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent Publication No. 2021-025135 [Patent Document 2] Patent Publication No. 2021-127545 Summary of the Invention [Problem to be solved by the invention]

[0005] However, knitted fabrics containing modified cellulose fibers and polyurethane elastic yarns have a problem in that the dyeing uniformity is easily reduced by heat setting in the presetting process.

[0006] In order to solve the above problems, the present invention provides a knitted fabric in which dyeing uniformity is unlikely to deteriorate, and a method for producing a dyed knitted fabric using the same. [Means for solving the problem]

[0007] In one embodiment, the present invention provides a yarn comprising a blended spun yarn (A) containing modified cellulosic fibers and regular cellulosic fibers, a spun yarn (B) containing regular cellulosic fibers, and a polyurethane elastic yarn, The modified cellulosic fiber is a regular cellulosic fiber to which an ethylenically unsaturated double bond and a carboxyl group (-COOH) or a salt thereof have been introduced, The polyurethane elastic yarn relates to a knitted fabric that is heat settable at a temperature below 180°C.

[0008] In another aspect, the present invention comprises: A knitting step of producing a knitted fabric including a blended spun yarn (A) containing modified cellulosic fibers and regular cellulosic fibers, a spun yarn (B) containing regular cellulosic fibers, and a polyurethane elastic yarn; A presetting process of heat-setting the knitted fabric while fixing its width; A step of dyeing the knitted fabric that has been subjected to the presetting step, The modified cellulosic fiber is a regular cellulosic fiber to which an ethylenically unsaturated double bond and a carboxyl group (-COOH) or a salt thereof have been introduced, The present invention relates to a method for producing a dyed knitted fabric, wherein in the presetting step, the knitted fabric is heat-set at a temperature of less than 180° C. while its width is fixed. Effect of the Invention

[0009] In the present invention, by using a polyurethane elastic yarn that can be set at a temperature of less than 180° C. as the elastic yarn, it is possible to provide a knitted fabric that can be set at a low temperature in the presetting process and is less likely to deteriorate in dyeing uniformity. In addition, a method for producing a dyed knitted fabric that is less likely to deteriorate in dyeing uniformity using the knitted fabric of the present invention is provided. [Brief description of the drawings]

[0010] [Figure 1] FIG. 1 is a flow diagram showing the flow of steps in a method for producing a dyed knitted fabric according to one embodiment of the present invention. [Diagram 2] FIG. 2 is a front view of an inner garment using a dyed knitted fabric produced by the method for producing a dyed knitted fabric according to one embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] The present inventors have carried out various studies to improve the problem that the heat setting in the presetting process reduces the dyeing uniformity of knitted fabrics containing modified cellulose fibers and polyurethane elastic yarns in the subsequent dyeing process. As a result, they have presumed that the heating in the presetting process causes chemical changes in the parts of the modified cellulose fibers that contribute to dyeing. They have found that in order to prevent such chemical changes, it is necessary to heat set the fabric at a low temperature in the presetting process, and have come up with the idea that this problem can be improved by knitting polyurethane elastic yarns that can be heat set at a low temperature into the knitted fabric. The present invention was born from such an idea and has been completed.

[0012] One aspect of the present invention is a knitted fabric containing modified cellulosic fibers, regular cellulosic fibers, and polyurethane elastic yarn. Cellulosic fibers include natural fibers such as cotton and hemp, and regenerated fibers such as rayon, lyocell, and polynosic. Regular cellulosic fibers are unmodified cellulosic fibers. Modified cellulosic fibers are fibers in which ethylenically unsaturated double bonds and carboxyl groups (-COOH) or salts thereof are introduced into cellulosic fibers, and by introducing these, for example, the cellulosic fibers are given moisture absorbing heat generating properties. In addition to moisture absorbing heat generating properties, deodorizing properties and the like can also be imparted.

[0013] In one embodiment, the knitted fabric of the present invention comprises a blended spun yarn (A) containing modified cellulosic fibers and regular cellulosic fibers, a spun yarn (B) containing regular cellulosic fibers, and a polyurethane elastic yarn. In a preferred embodiment, the knitted fabric of the present invention is composed only of the blended spun yarn (A), the spun yarn (B), and the polyurethane elastic yarn. The blended spun yarn (A) is preferably composed only of modified cellulosic fibers and regular cellulosic fibers. The spun yarn (B) containing regular cellulosic fibers does not contain modified cellulosic fibers. The spun yarn (B) is preferably composed only of regular cellulosic fibers. By using such a yarn composition and adjusting the mass ratio of the modified cellulosic fibers and the polyurethane elastic yarn to the regular cellulosic fibers, it is possible to provide knitted fabrics suitable for various applications.

[0014] [Fabric composition] In one embodiment, the mass proportion of the modified cellulose-based fiber contained in the knitted fabric of the present invention is preferably 3 to 25 mass%, more preferably 5 to 22 mass%, even more preferably 6 to 20 mass%, and even more preferably 7 to 18 mass%, based on 100 mass% which is the total mass proportion of the modified cellulose-based fiber, the regular cellulose-based fiber, and the polyurethane elastic yarn. The mass proportion of the polyurethane elastic yarn contained in the knitted fabric of the present invention is preferably 3 to 15 mass%, more preferably 4 to 14 mass%, and even more preferably 5 to 12 mass%, based on 100 mass% which is the total mass proportion of the modified cellulosic fiber, the regular cellulosic fiber, and the polyurethane elastic yarn. The mass proportion of the regular cellulosic fiber contained in the knitted fabric of the present invention is preferably 60 to 94 mass%, more preferably 64 to 91 mass%, and even more preferably 68 to 89 mass%, based on 100 mass% which is the total mass proportion of the modified cellulosic fiber, the regular cellulosic fiber, and the polyurethane elastic yarn. As a result, there is little decrease in the strength of the knitted fabric due to the modification of the cellulosic fibers, and the knitted fabric has high functions such as moisture absorption and heat generation, and deodorization, and also has good stretchability. The knitted fabric of the present invention is preferably made of only modified cellulose-based fibers, regular cellulose-based fibers, and polyurethane elastic yarns, but may contain at least one type of fiber selected from the group consisting of polyester fibers, nylon fibers, and acrylic fibers as other fibers. The other fibers may be mixed and contained during the spinning of the blended spun yarn (A) or the spun yarn (B). The mass ratio of the other fibers is preferably 0.1 to 15 parts by mass relative to 100 parts by mass of the total mass of the modified cellulose-based fibers, regular cellulose-based fibers, and polyurethane elastic yarns. The knitted fabric is suitable for innerwear such as shirts and pants.

[0015] The polyurethane elastic yarn can be heat-set at a temperature below 180°C, preferably at a temperature between 130°C and 180°C, and more preferably at a temperature between 130°C and 175°C. This allows a dyed knitted fabric to be obtained in which the decrease in dyeing uniformity along the yarn direction is suppressed by the dyeing process. The ability of the polyurethane elastic yarn to be heat-set at each temperature can be determined by measuring the crystallization temperature by thermal analysis using differential scanning calorimetry (DSC). In addition, examples of commercially available polyurethane elastic yarns that can be heat-set at a temperature below 180°C include, for example, Nisshinbo's product name "Mobilon RL", Toray's product name "Lycra T-178C", Asahi Kasei's product name "Leica", and HYOSUNG's product name "creora eco-soft".

[0016] The polyurethane elastic yarn is preferably a filament yarn. Either monofilament or multifilament may be used, but the total fineness is preferably 15 to 80 decitex. This allows the stretchability of the knitted fabric to be well maintained.

[0017] The polyurethane elastic yarn is preferably a bare yarn. This allows the knitted fabric to maintain good elasticity. The polyurethane elastic yarn is preferably knitted into the blended spun yarn (A) and / or spun yarn (B) as a plating yarn. In this case, it is preferably stretched 1.5 to 3.5 times before being supplied.

[0018] The knitted fabric of the present invention includes circular knitting, weft knitting, warp knitting (including tricot knitting and raschel knitting), pile knitting, etc., and may be any of plain knitting, plain knitting, rib knitting, smooth knitting (double-sided knitting), elastic knitting, pearl knitting, Denbigh structure, cord structure, atlas structure, chain structure, insertion structure, and knitting fabrics combining these. Various interlacing methods are used to produce the knitted fabric. Interlacing knitted fabrics may be warp knitting or weft knitting, for example, tricot, raschel, circular knitting, etc. The knitting structure may be any knitting structure such as half knitting, reverse half knitting, double atlas knitting, double Denbigh knitting, and knitting fabrics combining these.

[0019] The mass per unit area of ​​the knitted fabric (basis weight) 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 When the mass per unit area of ​​the knitted fabric is within the above range, it is suitable for use as an inner garment.

[0020] Next, the manufacturing method of the knitted fabric and the manufacturing method of the dyed knitted fabric of the present invention will be described. The manufacturing method of the knitted fabric of the present invention preferably includes the following grafting step and knitting step. The manufacturing method of the dyed knitted fabric of the present invention preferably includes the following grafting step, knitting step, opening step, presetting step, and dyeing step.

[0021] (1) Grafting process In this process, modified cellulosic fibers are obtained by graft-bonding a compound containing an ethylenically unsaturated double bond and a carboxyl group (-COOH) to regular cellulosic fibers, and converting the carboxyl group into a sodium salt as necessary. (2) Knitting process In this process, a blended spun yarn (A) containing modified cellulosic fibers and regular cellulosic fibers, a spun yarn (B) containing regular cellulosic fibers, and a polyurethane elastic yarn (filament yarn) are used as supply yarns to knit a knitted fabric in a conventional manner on a knitting machine. The proportions of each fiber in the knitted fabric are, for example, 3 to 25 mass% modified cellulosic fibers, 60 to 94 mass% regular cellulosic fibers, and 3 to 15 mass% elastic fibers. (3) Opening process When knitting is performed using a circular knitting machine in the knitting process, the tubular knitted fabric is cut in the knitting direction (vertical direction) and cut open into a sheet. In this state, the cut portion curls and is difficult to handle, so it is heat-set in the next presetting process. When a tubular knitted fabric is cut using a circular knitting machine, the width direction of the fabric becomes perpendicular to the knitting direction (horizontal direction) in a normal dyeing process. Furthermore, a weft knitted fabric or a warp knitted fabric does not require an opening process, but the ends of the fabric are prone to curling, which can cause problems such as shrinkage during the dyeing process, so it is preferable to heat-set it in the next presetting process. (4) Presetting process In this step, the knitted fabric is heat-set at a temperature of less than 180°C while the width of the knitted fabric is fixed by a pin tenter. This makes it possible to obtain a sheet-like knitted fabric without curling. The heat-setting temperature is preferably 130°C or more and less than 180°C, more preferably 140°C or more and 175°C or less. The heat-setting time is preferably 45 to 120 seconds. (5) Dyeing process The dyeing process is carried out by a conventional method.

[0022] In addition, a refining and bleaching treatment may be carried out between the presetting process and the dyeing process. This will result in a high whiteness and a high brightness when the cellulosic fiber is cotton.

[0023] [Grafting process] Next, the grafting step will be described in more detail. In the grafting process, it is preferable to introduce a carboxyl group (-COOH) by grafting a carboxyl group-containing compound containing an ethylenically unsaturated double bond onto a sliver-shaped cellulosic fiber (regular cellulosic fiber). If the fiber is in a sliver shape, the grafting process can be carried out in a continuous process using a continuous fiber bundle (sliver).

[0024] Examples of the carboxyl group-containing compound include compounds containing one ethylenically unsaturated double bond and one or two carboxyl groups. Specifically, the carboxyl group-containing compound is preferably at least one carboxylic acid selected from acrylic acid, methacrylic acid, itaconic acid, maleic acid, and fumaric acid. Particularly, at least one carboxylic acid selected from acrylic acid and methacrylic acid is preferred. When these compounds are grafted onto the surface of cellulosic fibers such as cotton, a washing-resistant moisture-absorbing heat-generating function can be imparted during the manufacturing process of moisture-absorbing heat-generating knitted fabrics.

[0025] The grafting of the carboxyl group-containing compound onto the cellulosic fiber can be carried out by a conventional method. The graft chains are introduced by various reactions, such as a reaction in which a sliver of cellulosic fiber is irradiated with an electron beam to generate radicals on the surface of the cellulosic fiber, a reaction in which the carboxyl group-containing compound is brought into contact with the generated radicals to graft carboxylic acid groups onto the surface of the cellulosic fiber as compound groups derived from the carboxyl group-containing compound, and a reaction in which a catalyst is used to perform grafting. As a result, carboxyl groups are introduced into the regular cellulosic fiber.

[0026] The amount of the carboxyl group-containing compound applied is preferably 1 to 30% by mass, more preferably 5 to 20% by mass, based on the regular cellulosic fiber. In the regular cellulosic fiber (modified cellulosic fiber) into which the carboxyl group has been introduced, the mass ratio (graft ratio) of the carboxylic acid group, which is the graft chain, is preferably 1 to 30% by mass, more preferably 5 to 30% by mass. If the amount applied is within the above range, for example, even when blended with unmodified fibers such as regular cellulosic fibers, excellent moisture absorbing and heat generating function can be exhibited.

[0027] Next, an example of the treatment for graft bonding will be described using cotton (natural cellulose fiber) as an example of regular cellulose 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 after that, the surface is continuously contacted with a carboxyl group-containing compound containing an ethylenically unsaturated double bond. The reason for contacting the carboxyl group-containing compound 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 the radicals are deactivated over time, it is preferable to contact the carboxyl group-containing compound with the surface of the cotton fiber immediately after the electron beam irradiation.

[0028] In addition, it is preferable to continuously contact the carboxyl group-containing compound with the surface of the cotton fiber after the electron beam irradiation, since the carboxyl group-containing compound can efficiently contact the radicals generated on the surface of the cotton fiber. Furthermore, continuously contacting the carboxyl group-containing compound with the surface of the cotton fiber is advantageous for graft bonding to a long spinning sliver. Furthermore, it is preferable to irradiate the electron beam under a nitrogen atmosphere, since the generated radicals are less likely to be deactivated. Regarding the electron beam irradiation method, a so-called simultaneous irradiation method in which the carboxyl group-containing compound is brought into contact with the surface of the cotton fiber and irradiated at the same time is also possible.

[0029] The shape of regular cellulosic fibers such as cotton fibers to be irradiated with electron beams is preferably a continuous sheet such as a sliver or wrap in the case of continuous processing, but is not limited to such a continuous shape in the case of batch processing.

[0030] The method for contacting the carboxyl group-containing compound with the surface of regular cellulosic fibers such as cotton may be any method such as immersion or spraying. For example, a method of preparing an aqueous solution of the carboxyl group-containing compound and immersing a sliver in the aqueous solution or a method of spraying the aqueous solution on a sliver is preferred.

[0031] As described above, after the carboxyl group-containing compound is grafted onto the sliver-shaped cellulosic fiber in the grafting process, the fiber is preferably washed with water and then dried to obtain a cellulosic fiber having a carboxyl group introduced therein (modified cellulosic fiber).

[0032] [Method of manufacturing spun yarn] In one embodiment, the method for producing a woven fabric of the present invention and the method for producing a dyed woven fabric of the present invention each include a step of producing a blended spun yarn (A) containing modified cellulosic fiber and regular cellulosic fiber before the knitting step. In one embodiment, the method for producing a woven fabric of the present invention and the method for producing a dyed woven fabric of the present invention each may include a step of producing a spun yarn (B) containing regular cellulosic fiber before the knitting step. In the blended spun yarn (A), the modified cellulosic fibers are preferably 8 to 50 mass% and the regular cellulosic fibers are preferably 50 to 92 mass%, and more preferably the modified cellulosic fibers are 10 to 45 mass% and the regular cellulosic fibers are 55 to 90 mass%. It is preferable to combine the blended spun yarn (A), the spun yarn (B) containing regular cellulosic fibers, and the polyurethane elastic yarn, and adjust the composition of the knitted fabric to have the mass ratio described in the above [Composition of knitted fabric].

[0033] The blending of modified cellulosic fibers and regular cellulosic fibers is preferably carried out in a drawing process which usually includes a doubling process. However, it can also be carried out in a carding process, a roving process, or a spinning process. For example, it can be carried out by arranging a plurality of webs, slivers, fleeces, or roving yarns, and stretching them at a predetermined ratio. In the roving and spinning processes, blending can be achieved by migration of the constituent fibers during twisting. The modified cellulosic fibers (slivers for spinning) can also be blended with regular cellulosic fibers (slivers) in a desired blending ratio in a beating process.

[0034] The blended spun yarn (A) and the spun yarn (B) may be the same or different and are preferably single or two-ply yarns having a British cotton count of 10 to 100, more preferably a British cotton count of 15 to 90, and even more preferably a British cotton count of 20 to 80. The twist coefficient K of the blended spun yarn (A) and the spun yarn (B) may be the same or different and is preferably 2.8 to 7.0, more preferably 3.0 to 6.5. The twist coefficient (K) is calculated by the following formula (Math 1).

number

[0035] [Knitting process] The knitted fabric is suitable for use as a knitted fabric for innerwear. The knitted fabric is stretchy and soft, and is suitable for use as a knitted fabric for innerwear. It is preferable that one or two out of every three yarns constituting the knitted fabric are the blended spun yarn (A), and the remaining yarn is a spun yarn (B) containing regular cellulosic fibers. A polyurethane elastic yarn is used as a plating yarn for the blended spun yarn (A) and / or the spun yarn (B). The spun yarn (B) is preferably a cotton spun yarn.

[0036] More specifically, when the knitted fabric is a knitted fabric suitable for innerwear, for example, three yarns are used as supply yarns, one of which is a blended spun yarn (A) containing 30% by mass of the modified cellulosic fiber and 70% by mass of normal untreated cellulosic fiber (regular cellulosic fiber), and the remaining two are spun yarns (B) consisting only of untreated cellulosic fiber (regular cellulosic fiber). Furthermore, polyurethane elastic yarn is used as a plating yarn for the blended spun yarn (A) and / or spun yarn (B). The amount of polyurethane elastic yarn used in the knitted fabric is 10% by mass. In this case, if the total mass of the knitted fabric is 100% by mass, a knitted fabric containing 9% by mass of the modified cellulosic fiber is obtained. In addition, two yarns are used as supply yarns, one of which is a blended spun yarn (A) containing 30% by mass of the modified cellulosic fiber and 70% by mass of normal untreated cellulosic fiber (regular cellulosic fiber), and the remaining yarn is a spun yarn (B) consisting only of untreated cellulosic fiber (regular cellulosic fiber). Furthermore, polyurethane elastic yarn is used as a plating yarn for the blended spun yarn (A) and / or spun yarn (B). The amount of polyurethane elastic yarn used in the knitted fabric is 7% by mass. In this case, if the total mass of the knitted fabric is 100% by mass, a knitted fabric containing 14% by mass of the modified cellulosic fiber is obtained.

[0037] [Scouring and bleaching treatment] As described above, in one embodiment of the method for producing dyed knitted fabric of the present invention, scouring and bleaching may be performed before dyeing. The scouring and bleaching can each be performed by a conventional method. Cellulosic fibers become white by scouring and bleaching. In particular, cotton has a reduced water absorbency and a dull color unless it is scouring and bleaching, and its product value decreases regardless of whether it is dyed or not. The scouring and bleaching can be performed, for example, by immersing the knitted fabric in an aqueous solution obtained by adding hydrogen peroxide (H2O2) and sodium hydroxide (NaOH) to water.

[0038] [Dyeing process] The type of dye may be selected according to the type of the fiber. Since the knitted fabric of the present invention contains the modified cellulosic fiber, the regular cellulosic fiber, and the polyurethane elastic yarn fiber, the dye used in the dyeing process is preferably at least one dye selected from reactive dyes and disperse dyes (they may be used in combination). After dyeing, the fabric is neutralized, soaped, and washed in the usual manner.

[0039] In the method for producing dyed knitted fabric of the present invention, it is preferable to perform a finishing process using an aqueous solution containing a water-absorbent softener after the dyeing step. The use of a water-absorbent softener can impart softness without reducing the moisture absorption and heat generation properties. The use of a water-repellent softener is not preferable because it reduces the water absorption and moisture absorption and heat generation properties.

[0040] 2 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. Polyurethane 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

[0041] 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. <Hygroscopic heat generation> (1) Take a sample of knitted fabric (20 cm x 20 cm), dry it in a dryer for 4 hours, and leave it in a desiccator containing silica gel overnight. (2) After drying, the sample knitted fabric is folded in half, a thermocouple temperature sensor is attached to the center, and the fabric 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 from unmodified cotton sliver with a cotton count of 50 (Comparative Example 1 below) is used as a reference fabric, and the difference between the maximum temperature of the reference fabric over the 15 minutes of measurement and the maximum temperature of the knitted fabric of Example 1 is calculated as the maximum temperature difference (°C).

[0042] 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 an electron beam at an exposure dose of 40 kGy and an acceleration voltage of 200 kV under a nitrogen atmosphere using an electrocurtain type electron beam irradiation device EC250 / 30 / 90L (manufactured by Iwasaki Electric Co., Ltd.). The sliver irradiated with the electron beam was immediately immersed in a 16% by mass aqueous solution of acrylic acid (manufactured by Nacalai Tesque Co., Ltd.) containing 0.5% by mass of a penetrant, and squeezed with a mangle to obtain a pickup rate of about 100% by mass relative to the weight of the sliver. Next, the sliver was washed with water to continuously remove unreacted acrylic acid, then dried at 80°C and coiled in a container for storage. The sliver obtained in this manner is called "treated cotton". The mass ratio of acrylic acid introduced in this treated cotton was 8% by mass.

[0043] <Spun yarn manufacturing> (1) Modified cotton blended yarn The modified cotton and unmodified cotton were blended in a blending process to spin a yarn having a British cotton count of 50. The proportion of modified cotton in the blended yarn was 30% by mass, and the proportion of unmodified cotton was 70% by mass. The twist coefficient K was 3.6. (2) Unmodified cotton yarn Unmodified cotton was used to spin yarn with a British cotton count of 50. The twist factor K=3.6.

[0044] <Production of knitted fabric> The modified cotton blended yarn, unmodified cotton spun yarn, and polyurethane elastic yarn were prepared, and the modified cotton blended yarn was supplied in a ratio of 1 yarn to 2 unmodified cotton spun yarns, and the polyurethane elastic yarn was supplied so as to account for 7% by mass of the knitted fabric. A commercially available polyurethane elastic yarn (manufactured by Nisshinbo Textile Co., Ltd., product name "Mobyron RL", total fineness 22 decitex) was used as the polyurethane elastic yarn. The polyurethane elastic yarn was supplied as a plating yarn to each yarn under tension so that it was stretched 2.5 times. A knitted fabric with a plain stitch structure was knitted using a circular knitting machine. The knitted fabric was then opened and preset heat-treated at 165°C for 85 seconds.

[0045] <Scouring, bleaching, dyeing> The obtained knitted fabric was subjected to a usual scouring treatment, a bleaching treatment, and a dyeing treatment using a black reactive dye to obtain a moisture-absorbing heat-generating dyed knitted fabric of Example 1. The above steps are shown in FIG.

[0046] In the moisture-absorbing heat-generating knitted fabric of Example 1, when the total mass of the moisture-absorbing heat-generating knitted fabric is taken as 100 mass%, the content of the moisture-absorbing heat-generating processed cotton is 9 mass%, and the total content of the unmodified cotton is 84 mass%. The mass (basis weight) of the knitted fabric is 170 g / m 2 The obtained knitted fabric was uniformly dyed and was a high-quality dyed product.

[0047] Example 2 Except for the preset conditions of 175° C. for 90 seconds, the moisture-absorbing and heat-generating dyed knitted fabric of Example 2 was obtained in the same manner as in Example 1. The obtained knitted fabric was uniformly dyed and was a high-quality dyed product.

[0048] Comparative Example 1 A moisture-absorbing, heat-generating dyed knitted fabric of Comparative Example 1 was obtained in the same manner as in Example 1, except that the preset conditions were 185°C for 90 seconds. The obtained knitted fabric had marbled horizontal streaks that were slightly lighter in color than the surrounding area, and was of poor quality compared to the knitted fabrics of Examples 1 and 2.

[0049] Comparative Example 2 A moisture-absorbing, heat-generating dyed knitted fabric of Comparative Example 2 was obtained in the same manner as in Example 1, except that the preset conditions were 195°C for 90 seconds. The obtained knitted fabric had clear horizontal streaks in a marbled pattern and was of significantly poorer quality than the knitted fabrics of Examples 1 and 2.

[0050] Comparative Example 3 A moisture-absorbing, heat-generating dyed knitted fabric of Comparative Example 3 was obtained in the same manner as in Example 1, except that the preset conditions were 205°C for 90 seconds. The obtained knitted fabric had parts with more distinct horizontal stripes than in Comparative Example 2, and was of extremely poor quality compared to the knitted fabrics of Examples 1 and 2.

[0051] Comparative Example 4 The dyed knitted fabric of Comparative Example 4 was obtained in the same manner as in Example 1, except that unmodified cotton spun yarn was used instead of the blended yarn containing modified cotton.

[0052] The maximum temperature was measured for each of the obtained moisture-absorbing and heat-generating dyed knitted fabric of Example 1 and the dyed knitted fabric (reference knitted fabric) of Comparative Example 4 according to the above <Moisture absorption and heat generation>. The moisture-absorbing and heat-generating dyed knitted fabric of Example 1 had a higher maximum temperature than the dyed knitted fabric of Comparative Example 4 (reference knitted fabric), and the maximum temperature difference between them (°C) was 0.6°C.

[0053] The moisture-absorbing and heat-generating dyed knitted fabrics of Examples 1 and 2 were used to sew the inner shirt shown in FIG. 2, and a wearing test was conducted. It was confirmed that the shirt was warm, comfortable to wear, and gentle on the skin. [Industrial Applicability]

[0054] The dyed knitted fabric of the present invention is suitable for innerwear such as shirts, pants, tights, socks, etc. It is also suitable for T-shirts, etc. [Explanation of symbols]

[0055] 1. Innerwear 2. Around the fuselage 3 Arm circumference

Claims

1. The present invention relates to a spun yarn comprising a blended spun yarn (A) containing modified cellulosic fibers and regular cellulosic fibers, a spun yarn (B) containing regular cellulosic fibers, and a polyurethane elastic yarn, The modified cellulosic fiber is a regular cellulosic fiber to which an ethylenically unsaturated double bond and a carboxyl group (—COOH) or a salt thereof have been introduced, The polyurethane elastic yarn is heat-settable at a temperature below 180°C.

2. 2. The knitted fabric of claim 1, wherein the polyurethane elastic yarn is heat settable at a temperature of 130°C or higher but lower than 180°C.

3. The mass ratio of the modified cellulose-based fiber contained in the knitted fabric is 3 to 30 mass% based on the total mass ratio of the modified cellulose-based fiber, the regular cellulose-based fiber, and the polyurethane elastic yarn being 100 mass%. The knitted fabric according to claim 1 or 2.

4. 3. The knitted fabric according to claim 1, wherein the polyurethane elastic yarn is a monofilament yarn or a multifilament yarn.

5. 3. The knitted fabric according to claim 1 or 2, wherein the polyurethane elastic yarn is a bare yarn.

6. 3. The knitted fabric according to claim 1 or 2, wherein the polyurethane elastic yarn is knitted into the blended spun yarn (A) and / or the spun yarn (B) as a plating yarn.

7. A knitting step of producing a knitted fabric including a blended spun yarn (A) containing a modified cellulosic fiber and a regular cellulosic fiber, a spun yarn (B) containing a regular cellulosic fiber, and a polyurethane elastic yarn; A presetting process of heat-setting the knitted fabric while fixing its width; A step of dyeing the knitted fabric that has been subjected to the presetting step, The modified cellulosic fiber is a regular cellulosic fiber to which an ethylenically unsaturated double bond and a carboxyl group (—COOH) or a salt thereof have been introduced, In the presetting step, the knitted fabric is heat-set at a temperature of less than 180° C. while its width is fixed.

8. The method for producing a dyed knitted fabric according to claim 7, further comprising a scouring treatment and a bleaching treatment between the presetting step and the dyeing step.

9. The mass ratio of the modified cellulose-based fiber contained in the knitted fabric is 3 to 30 mass% based on the total mass ratio of the modified cellulose-based fiber, the regular cellulose-based fiber, and the polyurethane elastic yarn being 100 mass%. The manufacturing method of the dyed knitted fabric according to claim 7 or 8.

10. 9. The method for producing a dyed knitted fabric according to claim 7 or 8, wherein the polyurethane elastic yarn is a monofilament yarn or a multifilament yarn.

11. 9. The method for producing a dyed knitted fabric according to claim 7 or 8, wherein the polyurethane elastic yarn is a bare yarn.

12. 9. The method for producing a dyed knitted fabric according to claim 7 or 8, wherein the polyurethane elastic yarn is knitted into the blended spun yarn (A) and / or the spun yarn (B) as a plating yarn.

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