Refreshing mixed spun yarn and refreshing fabric using the same

Abstract

To provide a refreshing mixed spun yarn having high refreshing property, and also to provide a refreshing fabric using the same.SOLUTION: The invention includes regenerated cellulose fiber (A) to which compound including ethylenic unsaturated double bond is grafted, and unmodified cellulose fiber (B) to which compound including ethylenic unsaturated double bond is not grafted. The mixed spun yarn of a refreshing mixed spun yarn is a mixed spun yarn of the regenerated cellulose fiber (A) and unmodified cotton fiber (B1) or a mixed spun yarn of the regenerated cellulose fiber (A), unmodified cotton fiber (B1), and unmodified regenerated cellulose fiber (B2). The invention is also a refreshing fabric using the refreshing mixed spun yarn.SELECTED DRAWING: None

Description

[Technical Field]

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

[0002] Natural cellulose fibers, typified by cotton fibers, are environmentally friendly and have excellent texture, dyeability, and water absorbency, making them widely used in a variety of clothing. However, while cotton underwear has excellent sweat absorption properties and can absorb large amounts of sweat, it has the drawback of being sticky and clinging to the skin and not providing sufficient sweat management. To address these drawbacks, Patent Document 1 proposes underwear made with tightly twisted yarn. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2001-020159 [Patent Document 2] Japanese Patent Application Laid-Open No. 2005-133243 [Patent Document 3] Patent Publication No. 2021-025135 Summary of the Invention [Problem to be solved by the invention]

[0004] However, the fibers disclosed in Patent Document 1 and the like still do not have sufficient cooling properties, and further improvements have been required.

[0005] In order to solve the above-mentioned problems of the prior art, the present invention provides a refreshing blended spun yarn with high refreshing properties and a refreshing fabric using the same. [Means for solving the problem]

[0006] One embodiment of the present invention relates to a cool blended spun yarn comprising regenerated cellulose fiber (A) to which a compound containing an ethylenically unsaturated double bond has been grafted, and unmodified cellulose fiber (B) to which a compound containing an ethylenically unsaturated double bond has not been grafted, wherein the blended spun yarn is a blended spun yarn of the regenerated cellulose fiber (A) and unmodified cotton fiber (B1), or a blended spun yarn of the regenerated cellulose fiber (A), unmodified cotton fiber (B1), and unmodified regenerated cellulose fiber (B2).

[0007] One embodiment of the present invention relates to a cool fabric comprising the cool blended spun yarn. [Effects of the Invention]

[0008] The present invention provides a refreshing blended spun yarn that includes regenerated cellulose fiber (A) grafted with a compound containing an ethylenically unsaturated double bond and unmodified cellulose fiber (B) not grafted with a compound containing an ethylenically unsaturated double bond. The refreshing blended spun yarn is a blended spun yarn of the regenerated cellulose fiber (A) and unmodified cotton fiber (B1), or a blended spun yarn of the regenerated cellulose fiber (A), unmodified cotton fiber (B1), and unmodified regenerated cellulose fiber (B2). This provides a refreshing blended spun yarn and a refreshing fabric using the same. Specifically, the regenerated cellulose fiber (A) grafted with a compound containing an ethylenically unsaturated double bond has high moisture absorption and release properties, which contribute to its refreshing properties. Therefore, clothing made using the fabric of the present invention is highly refreshing. The refreshing fabric preferably has a moisture absorption rate ratio of 1.05 or higher, and preferably a moisture release rate ratio of 1.05 or higher. DETAILED DESCRIPTION OF THE INVENTION

[0009] The present invention relates to a cool blended spun yarn in which regenerated cellulose fiber (A) to which a compound containing an ethylenically unsaturated double bond has been grafted (also referred to as "modified regenerated cellulose fiber" in this specification) is blended with unmodified cellulose fiber (B) to which a compound containing an ethylenically unsaturated double bond has not been grafted (also referred to as "unmodified cellulose fiber" in this specification). The blend may be any type of blend, such as a cotton blend or a draw blend. The modified regenerated cellulose fiber can provide coolness.

[0010] The unmodified cellulose fiber (B) is preferably an unmodified cotton fiber (B1) (also referred to herein as "unmodified cotton fiber") to which no compound containing an ethylenically unsaturated double bond has been grafted, or a blend of unmodified cotton fiber (B1) and unmodified regenerated cellulose fiber (B2). The blending ratio is preferably 5-20% by mass of modified regenerated cellulose fiber (A) and 80-95% by mass of unmodified cotton fiber (B1), or 5-20% by mass of modified regenerated cellulose fiber (A), 50-85% by mass of unmodified cotton fiber (B1), and 10-30% by mass of unmodified regenerated cellulose fiber (B2), relative to 100% by mass of the blended spun yarn. The above-mentioned ranges can provide a more suitable cooling sensation.

[0011] The cool blended spun yarn preferably has a British cotton count of 10 to 80. To convert the British cotton count to the internationally used tex count, use the formula 590.5413 / British cotton count.

[0012] When the cooling blended spun yarn is a twisted yarn, the twist factor K of the cooling blended spun yarn is preferably 3.6 or more, more preferably 4.0 or more, from the viewpoint of improving cooling properties, and is preferably 8.5 or less, more preferably 8.0 or less, from the viewpoint of spun yarn quality. If the cooling blended spun yarn is a hard-twisted yarn with a twist factor K of 3.6 or more, the fabric will have good skin-releasing properties, which is preferable. The twist factor K can be calculated by the following formula. K=t / √S where t is the number of twists per inch (2.54 cm), and S is the English count (a multiple of 840 yards (0.9144 m) at a standard weight of 1 pound (0.4536 kg)).

[0013] The cool blended spun yarn may be a quickspin spun yarn (open-end spun yarn). Spinning machines for producing quickspin spun yarn (open-end spun yarn) include, for example, the Quickspin Spinning Machine manufactured by Worcester and the QSS-R2000 manufactured by SDL International (both rotor-type open-end spinning machines). The cool blended spun yarn is a real twist yarn, and the constituent fibers have a single helical structure.

[0014] Examples of compounds containing an ethylenically unsaturated double bond include compounds 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 preferred. Chemically bonding these compounds to the surface of cellulose fibers can, for example, impart high moisture absorption and desorption properties. The graft bond is formed through various reactions, including a reaction in which radicals are generated on the surface of cellulose fibers by irradiation with an electron beam, a reaction in which the generated radicals are grafted onto the surface of cellulose fibers 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 the range of 1 to 30% by mass, more preferably 5 to 25% by mass, based on the regenerated cellulose fibers.

[0015] The cool fabric is preferably a knitted fabric. 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. In addition, the knitting structure may be any knitting structure such as half knitting, reverse half knitting, double atlas knitting, double Denbigh knitting, and knitting combining these.

[0016] In one embodiment, the cooling fabric may be made only of spun yarn containing the cooling blended spun yarn, but in another embodiment, it may contain elastic yarn in addition to the blended spun yarn. When the cooling fabric of the present invention contains elastic yarn as a constituent yarn, the constituent yarn of the cooling fabric of the present invention may be only the blended spun yarn and the elastic yarn.

[0017] In one embodiment, the refreshing fabric may be produced by mixing a refreshing blended spun yarn with a regular yarn, i.e., by interweaving or interknitting these yarns. For example, one refreshing blended spun yarn can be used with one or two regular yarns. The regular yarn is preferably a spun yarn containing unmodified cellulose fiber, more preferably a spun yarn containing unmodified cotton fiber or unmodified regenerated cellulose fiber, and even more preferably a spun yarn consisting of 100% unmodified cotton fiber by mass.

[0018] The mass per unit area of the cooling fabric is 80 to 300 g / m 2 is preferable, and more preferably 90 to 270 g / m 2 and more preferably 100 to 240 g / m 2 If it is in the above range, it is suitable for use as innerwear.

[0019] In the present invention, the regenerated cellulose fiber refers to rayon, Bemberg, Tencel, Lyocell, and the like.

[0020] The refreshing fabric of the present invention is preferably treated after the dyeing process by acid treatment at pH 5 or less, rinsing with water, alkali treatment at pH 7.5 or more, rinsing with water, and drying. The acid treatment is preferably a treatment in which the fabric is immersed in an aqueous solution containing citric acid, malic acid, or the like. Citric acid is added at about 1 to 10 g / L, preferably about 2 to 8 g / L. When the pH of the aqueous solution is 5 or more, it is preferable to add citric acid until the pH becomes 5 or less. The acid treatment conditions are preferably a temperature of 30 to 50°C and a time of 10 to 30 minutes. The water rinse after the acid treatment is preferably at room temperature (25°C) for about 5 minutes. Ca, Mg, and the like can be removed by the acid treatment.

[0021] After acid treatment and water rinsing, alkali treatment is preferably performed. The alkali treatment involves immersing the fabric in an aqueous solution containing a chelating agent (sequestering agent) and sodium bicarbonate (sodium bicarbonate, NaHCO3). The chelating agent (sequestering agent) is preferably added at about 1.0 g / L, particularly about 0.3 to 1.5 g / L, and sodium bicarbonate (sodium bicarbonate) is preferably added at about 4 g / L. Soda ash (Na2CO3) can also be used instead of sodium bicarbonate (sodium bicarbonate, NaHCO3). If the pH of the aqueous solution is below 7.5, it is preferable to add sodium bicarbonate until the pH reaches 7.5 or higher. The alkali treatment conditions are preferably a temperature of 30 to 50°C and a time of 10 to 30 minutes. After the alkali treatment, the fabric is preferably washed twice with water at room temperature (25°C) for about 5 minutes. Examples of chelating agents (sequestering agents) that can be used include ethylenediaminetetraacetic acid (EDTA), diethylenetriaminepentaacetic acid (DTPA), hydroxyethylethylenediaminetriacetic acid (HEDTA), tetrasodium L-glutamate diacetate, glycol ether diaminetetraacetic acid, ethylenediamine, bipyridine, phenanthroline, porphyrin, and crown ether. Alkali treatment allows any portion of the grafted bond on the fiber surface to exist in the form of a carboxylic acid group (-COOH) or its sodium salt, maintaining high moisture absorption and desorption properties. [Example]

[0022] The present invention will be specifically described below using examples, but the present invention is not limited to the following examples.

[0023] <Moisture absorption / desorption test> The moisture absorption and desorption test (BOKEN Standard: BQE A 034) was conducted by the Boken Quality Evaluation Institute, a general incorporated foundation. Specifically, the test procedure is as follows: After conditioning the moisture in an initial condition box (25°C, 40% RH), a test specimen (10 cm x 10 cm) was transferred to a moisture absorption box (25°C, 80% RH) and left there until the specimen's mass reached equilibrium. The specimen was then returned to the initial condition box (25°C, 40% RH). Once the specimen's mass reached equilibrium, the mass measurement was terminated. During this time, the specimen's mass was measured every 10 seconds. From the measurement results, the following moisture absorption ratio, moisture absorption rate ratio, moisture absorption rate difference, moisture absorption rate ratio per unit area after 1 minute, and moisture desorption rate ratio per unit mass after 5 minutes were calculated, and these are shown in Table 1. The control item used to calculate the moisture absorption ratio, moisture absorption rate ratio, moisture absorption rate difference, moisture absorption rate (μg / cm2·min) ratio, and moisture desorption rate (mg / g·min) ratio was an unmodified 100% cotton knitted fabric prepared in the same way as each test specimen. (moisture absorption ratio) Moisture absorption ratio = Moisture absorption of knitted fabrics in the following Examples and Comparative Examples / Moisture absorption of unmodified 100% cotton knitted fabric. The moisture absorption amount is calculated from the mass of the test piece when it reaches equilibrium after placing the test piece in a moisture absorption box (25°C, 80% RH). (moisture absorption ratio) Moisture absorption rate ratio = Moisture absorption rate of knitted fabrics in the following Examples and Comparative Examples / Moisture absorption rate of unmodified 100% cotton knitted fabric The moisture absorption rate (%) is a value calculated using the following formula. Moisture absorption rate (%) = Place the test piece in a moisture absorption box (25°C, 80%RH), and calculate the amount of moisture absorbed (g) when the mass of the test piece reaches equilibrium by dividing the weight of the test piece (initial condition) by 100. (Moisture absorption rate difference) Difference in moisture absorption rate = (moisture absorption rate of knitted fabrics in the following Examples and Comparative Examples) - (moisture absorption rate of unmodified 100% cotton knitted fabric)

[0024] Example 1 <Sliver processing> A regular rayon sliver (composed of fibers with an average single-filament fineness of 0.9 decitex, an average fiber length of 38 mm, and a mass per unit length of 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 32% 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 resulting sliver is referred to as "modified rayon." This modified rayon contained 23.4% by weight of acrylic acid bound to it. <Spinning> A spun yarn having a cotton count of 20 was produced using a Quickspin System (SDL (registered trademark) QUICKSPIN, QSS-2000) using 10% by mass of the modified rayon, 20% by mass of unmodified rayon, and 70% by mass of unmodified cotton as raw materials. <Knitting> The spun yarn was fed to a circular knitting machine to knit a plain knitted fabric. <Scouring, bleaching, dyeing> The resulting knitted fabric was subjected to scouring, bleaching and dyeing treatments according to conventional methods. <Alkali replacement processing> (1) Acid treatment An aqueous solution of 2 g / L citric acid was prepared, and the pH was adjusted to 5 or less. The fabric was immersed in this aqueous solution at a bath ratio of 1:15 and treated at 40°C for 20 minutes. Thereafter, it was washed with water at room temperature (25°C) for 5 minutes. (2) Alkali treatment Next, the solution was adjusted to pH 7.5 or higher with 4 g / L of sodium bicarbonate and 1 g / L of a chelating agent (diethylenetriaminepentaacetic acid (DTPA)). The fabric was immersed in this solution at a bath ratio of 1:15 and treated at 40°C for 20 minutes. This was followed by two 5-minute water washes at room temperature (25°C), yielding a knitted fabric. The mass per unit area (basis weight) of this knitted fabric was 216 g. <Sewing> The knitted fabric obtained in this way was used to sew a long-sleeved shirt as innerwear. The elastic yarn was placed around the body during sewing. The weight of one shirt was 145 g for a men's size L. Furthermore, the knitted fabric was subjected to a moisture absorption / desorption test.

[0025] (Comparative Example 1) The same procedure as in Example 1 was carried out, except that the modified cotton, unmodified rayon, and unmodified cotton were used at 10% by mass, 30% by mass, and 60% by mass, respectively. The mass per unit area (basis weight) of this knitted fabric was 222 g.

[0026] (Comparative Example 2) Except for using 30% by mass of unmodified rayon and 70% by mass of unmodified cotton, the same procedure as in Example 1 was carried out. The mass per unit area (basis weight) of this knitted fabric was 216 g.

[0027] (Comparative Example 3) The same procedure as in Example 1 was carried out except that the modified cotton was 10% by mass and the unmodified cotton was 90% by mass. The mass per unit area (basis weight) of this knitted fabric was 163 g / m 2 It was.

[0028] The above results are summarized in Table 1. In Table 1, the moisture absorption amount ratio, moisture absorption rate ratio, moisture absorption rate ratio, and moisture desorption rate ratio are all values calculated by taking the value of 1 for a knitted fabric made from 100% unmodified cotton spun yarn produced using a quick spin system and knitting this spun yarn as 1.

[0029] [Table 1]

[0030] As is clear from Table 1, Example 1 had higher moisture absorption amount ratio, moisture absorption rate ratio, moisture absorption speed ratio, and moisture desorption speed ratio than the comparative examples. Furthermore, when the obtained fabric was sewn into a shirt and subjected to a wearing test, it was confirmed that the shirt was highly refreshing, comfortable to wear, and gentle on the skin.

[0031] In the examples, the spinning method described above was used to confirm the properties of the spun yarn, but the practice of the present invention is not limited to the spinning method described above. [Industrial Applicability]

[0032] Clothing made from the refreshing fabric of the present invention is suitable for innerwear such as shirts and pants. It is also suitable for T-shirts and the like because it is gentle on the skin.

Claims

1. A cool blended spun yarn comprising: (A) regenerated cellulose fibers grafted with a compound containing an ethylenically unsaturated double bond; and (B) unmodified cellulose fibers not grafted with a compound containing an ethylenically unsaturated double bond, The blended spun yarn is a blended spun yarn of the regenerated cellulose fiber (A) and unmodified cotton fiber (B1), or a cool blended spun yarn of the regenerated cellulose fiber (A), unmodified cotton fiber (B1), and unmodified regenerated cellulose fiber (B2).

2. 2. The refreshing blended spun yarn according to claim 1, wherein the regenerated cellulose fiber (A) to which the compound containing an ethylenically unsaturated double bond has been grafted accounts for 5 to 20% by mass, the unmodified cotton fiber (B1) accounts for 50 to 85% by mass, and the unmodified regenerated cellulose fiber (B2) accounts for 10 to 30% by mass, relative to 100% by mass of the blended spun yarn.

3. 2. The cool blended spun yarn according to claim 1, wherein the British cotton count of the cool blended spun yarn is 10 to 80.

4. 2. The refreshing blended spun yarn according to claim 1, wherein the compound containing an ethylenically unsaturated double bond is added in an amount of 1 to 30% by mass based on the cellulose fiber.

5. A cool fabric comprising the cool blended spun yarn according to any one of claims 1 to 4.

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

7. The cooling fabric according to claim 5, wherein the cooling fabric is a fabric for innerwear.

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