Woven and knitted fabrics

Abstract

To provide a woven knit fabric having both water absorbability and light fastness, as well as high surface quality.SOLUTION: A multiple textured woven knit fabric includes a polyester spun-dyed yarn, a cation dyeable polyester fiber yarn and / or cellulose-based fiber yarn, and a connection yarn, with the polyester spun-dyed yarn disposed on the front face, and the cation dyeable polyester fiber yarn and / or cellulose-based fiber yarn disposed on the rear face. The multiple textured woven knit fabric has a light fastness of 6 or more, and a water absorbability on the rear face of 3 seconds or less.SELECTED DRAWING: None

Description

[Technical field]

[0001] The present invention relates to a woven or knitted fabric which overcomes the problems of low light fastness of dyed cotton and low water absorbency of polyester, and which is further endowed with high light fastness for use in uniforms. [Background technology]

[0002] Traditionally, woven and knitted fabrics using only polyester fibers have low water absorption, so currently, for working uniforms, polyester fibers are generally mixed with cellulosic fibers such as cotton. However, cellulosic fibers such as cotton tend to have low light fastness because they are dyed with reactive dyes and direct dyes. When polyester and cotton are mixed, there are problems with the woven and knitted fabrics, such as color differences and impaired surface quality due to the different dyeing methods of the two and contamination by disperse dyes used to dye polyester. In addition, the same phenomenon occurs when cationic dyeable polyester is used on the back side, so there are problems with surface quality (appearance) for mixed materials made mainly of polyester fibers.

[0003] In order to solve such problems, there are prior art techniques such as using dyed polyester for the purpose of improving light fastness.

[0004] For example, a fabric has been proposed to which a resin has been applied, in which the fibers constituting at least the portion that comes into contact with the resin are dyed polyester fibers (Patent Document 1). Such a fabric is said to be capable of suppressing dye transfer to the resin and to have excellent heat resistance and abrasion resistance.

[0005] In addition, a Taslan fabric has been proposed, which is made up of three types of yarns: dyed polyester yarn A obtained by dispersing a pigment in polyester dyeable with disperse dyes; non-dyed polyester yarn B dyeable with disperse dyes; and non-dyed polyester yarn C dyeable with cationic dyes, each of which is subjected to Taslan processing as a core yarn and / or sheath yarn, and in which the fabric composition ratios of these yarns in the fabric are 5 to 30% by weight for A, 50 to 90% by weight for B, and 5 to 40% by weight for C (A+B+C=100) relative to the total weight of the fabric, and the entire fabric is additionally dyed (Patent Document 2).It is said that such a fabric can provide a Taslan fabric obtained by piece dyeing, which has a complex, multi-colored feel and excellent light fastness and weather resistance.

[0006] However, even with these prior art techniques, it has been difficult to simultaneously achieve the three requirements of water absorbency, light resistance, and surface quality (appearance). [Prior art documents] [Patent documents]

[0007] [Patent Document 1] Patent Publication No. 2019-143278 [Patent Document 2] Patent Publication No. 6-287869 Summary of the Invention [Problem to be solved by the invention]

[0008] Therefore, an object of the present invention is to provide a woven or knitted fabric that is highly light-resistant and highly water-absorbent, and is ideal for uniform use, while improving the surface quality (appearance), which is an issue with multi-structure woven or knitted fabrics made of mixed materials. [Means for solving the problem]

[0009] In order to solve the above problems, the multi-structure woven or knitted fabric of the present invention has the following configuration. A multi-structure woven or knitted fabric comprising polyester dope-dyed yarn, cationic dyeable polyester fiber yarn and / or cellulosic fiber yarn, and bonded yarn, the polyester dope-dyed yarn being disposed on a surface and the cationic dyeable polyester fiber yarn and / or cellulosic fiber yarn being disposed on a back surface, The binding yarn is a polyester dope-dyed yarn, The multi-structure woven / knitted fabric is characterized by having a light fastness of grade 6 or higher and a water absorbency of the back surface of 3 seconds or less.

[0010] The multi-structure woven or knitted fabric of the present invention is preferably dyed with at least one of cationic dyes, reactive dyes and direct dyes.

[0011] In the multi-structure woven or knitted fabric of the present invention, the binding yarn is a polyester dope-dyed yarn. do. Effect of the Invention

[0012] This invention combines water absorbency and light fastness, which are in high demand for uniform applications, while minimizing dye adsorption differences when using different materials. It also makes it possible to simultaneously solve the three issues of water absorbency of 3 seconds or less, light fastness of grade 6 or higher, and excellent surface quality (appearance). DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0013] The polyester dyed yarn in the present invention is a typical dyed yarn obtained by known means, such as a colored multifilament yarn or spun yarn, obtained by kneading a color-developing component such as a pigment or dye into a molten polymer when spinning polyester fiber.

[0014] The cationic dyeable polyester fiber yarn used on the back side refers to a polyester fiber yarn that can be dyed with a cationic dye that has an anionic group such as a sulfo group introduced during polyester fiber spinning. As a method for obtaining the raw polymer of the cationic dyeable polyester fiber yarn, as is generally known, 1.0 to 3.0 mol % of a 5-sodium sulfoisophthalic acid component is copolymerized with a normal polyester. As for the cellulose-based fiber yarn, all cellulose-based fiber yarns such as cupra, rayon, and cotton are suitable, but those using cotton are more suitable.

[0015] In the present invention, it is preferable not to dye the polyester using the dope-dyed yarn on the surface with a disperse dye, which has high dyeability for polyester, in order to avoid contamination by the dye.

[0016] In the present invention, the back side of the woven or knitted fabric is provided with a cellulose-based fiber yarn and / or a cationic dyeable polyester fiber yarn different from the original dyed polyester on the front side. If the fiber yarn on the back side is not dyed, the undyed yarn on the back side may protrude from the gaps in the surface structure, causing flickering or fluffing to be noticeable on the surface of the fabric, which may impair the quality. Therefore, in order to improve the quality, it is preferable to dye the fiber on the back side with a dye suitable for each fiber type. When the fiber yarn used is a cellulose-based fiber yarn, it is preferable to dye it with a reactive dye or a direct dye, but it is also possible to dye it with a threne dye or a sulfur dye that dyes cellulose-based fiber yarns. In the case of a cationic dyeable polyester fiber yarn, it is preferable to dye it with a cationic dye. In general, cationic dyeable polyester fiber yarns can be dyed with a disperse dye, but as mentioned above, it is possible that the original dyed polyester yarn may be contaminated, impairing the surface quality (appearance) or affecting the light fastness, so it is preferable not to use a disperse dye in the present invention.

[0017] In addition, the woven / knitted fabric of the present invention has a multi-layer structure. If the fabric is not a multi-layer structure, it is difficult to prevent the fibers to be dyed with a dye from being exposed on the surface. Examples of multi-layer weave structures include multi-layer weaves such as weft double weave, warp double weave, warp double weave, triple- to quintuple-weave, sewn weave, lappet weave, broche weave, mesh weave, knitted weave, ribbed fabric, and special overlapping weave structures such as belts and woven belts. From the viewpoint of wearing comfort and tailoring appearance in consideration of the intended use, weft double weave, warp double weave, and warp double weave are preferably used. Examples of multi-layer knit structures include double-sided knit, double tricot, atlas knit (Davil Van Dyke), and cord knit, and from the viewpoint of wearing comfort and tailoring appearance in consideration of the intended use, double tricot is preferably used.

[0018] The multi-structure woven or knitted fabric includes a binding yarn that connects the front surface and the back surface. As the binding yarn, the ground warp or weft yarn or ground knitting yarn may be used as it is, or a different yarn from the ground warp or weft yarn or ground knitting yarn may be used, either of which is preferable. When cationic dyeable polyester fiber yarn or cellulosic fiber yarn arranged on the back surface is used as the binding yarn, the binding yarn part fades during light fastness evaluation, causing flickering in which a small part of the front surface looks whitish, and causing deterioration of light fastness. Therefore, it is preferable to use the same yarn as the dope-dyed yarn arranged on the front surface as the binding yarn. do. Similarly, in terms of fabric design, it is preferable to use a design in which the cellulosic fiber yarns or cationic dyeable polyester fiber yarns arranged on the back side are not exposed on the front side. EXAMPLES

[0019] Next, the woven or knitted fabric of the present invention will be described in detail with reference to examples. (Evaluation method) (1) Light fastness Evaluation was carried out using both the JIS L 0842 ultraviolet carbon arc lamp method (third exposure method) and JIS L 0843 (xenon arc lamp method: ISO method). In the table of evaluation results, poor results are indicated as a series.

[0020] (2) Water absorption The evaluation was carried out according to the drop method of JIS L 1907, a method for testing water absorption of textile products. (3) Surface quality (appearance) Surface quality (appearance) was visually evaluated by three evaluators before and after the ultraviolet light irradiation in (1) to determine whether or not there was flickering on the surface. Those judged by two or more evaluators to have no flickering were given a rating of ○. Example 1 A double-ply 2 / 1 twill fabric was used, with black dope-dyed false twist yarn (75 decitex, 72 filaments) made of polyethylene terephthalate as the warp and weft on the front side, and cotton yarn (84 count) as the warp and weft on the back side. The fabric was woven using the same dope-dyed yarn as that used on the front side as the binding yarn. The cotton yarn used on the back side was dyed using a direct dye in a jet dyeing machine in the usual manner to obtain a test fabric. The evaluation results are shown in Table 1. The fabric had excellent surface quality (appearance) both initially and after UV exposure, along with 2-second water absorption and grade 7 light fastness. Example 2 The fabric of Example 1 was dyed with a reactive dye to obtain a test fabric. The evaluation results are also shown in Table 1. In addition to the 2-second water absorbency and light fastness of grade 8, the fabric had excellent surface quality (appearance) both initially and after UV irradiation. Example 3 Instead of the cotton yarn on the back side, a ply-twisted yarn of cotton yarn and cationic dyeable polyester fiber yarn was used, and the fabric was woven under the same conditions as in Example 1 and dyed using a combination of cationic dyes and direct dyes to obtain a test fabric. The evaluation results are also shown in Table 1. The fabric had a water absorbency of 3 seconds, a light fastness of grade 7, and excellent surface quality (appearance) both initially and after UV irradiation. Example 4 The dyed polyester yarn used in Example 1 was placed on the front side of a double-knitted double tricot, cotton yarn was placed on the back side, and dyed with a direct dye, knitting the fabric using dyed polyester yarn as the binding yarn, to obtain a test fabric. The evaluation results are also shown in Table 1. Combined with water absorbency at 1 second and light fastness of grade 8, the fabric had excellent surface quality (appearance) both initially and after UV irradiation. Comparative Example 1 A test cloth was obtained in the same manner as in Example 1, except that the dope-dyed yarn on the surface was replaced with uncolored polyester yarn and a disperse dye and a reactive dye were used in combination during dyeing. The evaluation results are also shown in Table 1. The light fastness was poor. Comparative Example 2 Except for replacing the dope-dyed yarn of the binding yarn with cotton yarn, the fabric was woven and dyed under the same conditions as in Example 1 to obtain a test fabric. The evaluation results are also shown in Table 1. The evaluation results are also shown in Table 1. The surface quality (appearance) was poor both initially and after UV irradiation. Comparative Example 3 Except for replacing the dope-dyed yarn of the binding yarn with a cationic dyeable polyester fiber yarn, the fabric was woven and dyed under the same conditions as in Example 3 to obtain a test fabric. The evaluation results are also shown in Table 1. The surface quality (appearance) after UV irradiation was poor. Comparative Example 4 The cotton yarn on the back side was replaced with uncolored polyester yarn, and the dope-dyed yarn of the binding yarn was replaced with uncolored polyester yarn, which was dyed with a disperse dye using a conventional liquid jet dyeing machine in the same manner as in Example 1 to obtain a test fabric. The evaluation results are also shown in Table 1. The water absorbency and light fastness were poor, and the surface quality (appearance) was poor both initially and after UV irradiation.

[0021] [Table 1] [Industrial Applicability]

[0022] The multi-structure woven or knitted fabric of the present invention is suitable for use in uniforms because it is both water absorbent and light resistant and has high surface quality.

Claims

1. A multi-structure woven or knitted fabric comprising polyester dyed yarn, cationic dyeable polyester fiber yarn and / or cellulosic fiber yarn, and bonding yarn, the polyester dyed yarn being disposed on the front side and the cationic dyeable polyester fiber yarn and / or cellulosic fiber yarn being disposed on the back side, the bonding yarn being polyester dyed yarn, the light fastness being grade 6 or higher, and the water absorbency of the back side being 3 seconds or less.

2. 2. The woven or knitted fabric according to claim 1, which is dyed with at least one dye selected from the group consisting of cationic dyes, reactive dyes and direct dyes.

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