White woven fabric

Abstract

To provide a woven fabric which is excellent in whiteness even if it is undyed, and allows an arrangement pattern of filaments different in see-through feeling to appear on the surface of the fabric, thereby having a three-dimensional feeling and designability.SOLUTION: There is provided a white woven fabric which is an undyed woven fabric formed of an undyed filament A made of a polyester resin containing titanium oxide fine particles of a content of 0.1 mass% or less, an undyed filament B made of a polyester resin containing titanium oxide fine particles of a content of 1.5 mass% or more, and a white conductive filament C. The white woven fabric includes 45 to 55 mass% of the filament A, 45 to 55 mass% of the filament B, and 0.1 to 5 mass% of the filament C in any square surrounded by 2.54 cm in the warp direction×2.54 cm in the weft direction at any position, both the warp yarn and the weft yarn constituting the woven fabric contain the filament A and the filament B, and the woven fabric has a cover factor of 2000 to 3000 and a whiteness (WI) of 70 or more.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a white woven fabric that uses specific amounts of two types of polyester multifilaments that have different titanium oxide fine particle contents, and is intended to be used undyed. [Background technology]

[0002] In recent years, as part of efforts to make the work environment cleaner, the use of white coats as uniforms for workers has become more common. The woven and knitted fabrics used in white coats contain conductive fibers that enhance anti-static properties by discharging charges generated by friction into the air through corona discharge. For example, Patent Documents 1 and 2 propose white woven and knitted fabrics containing conductive fibers for use in white clothing for food service and hospitals. These woven and knitted fabrics are dyed white after weaving to obtain spotless white woven and knitted fabrics suitable for white clothing.

[0003] Meanwhile, in recent years, various efforts have been made with the goal of realizing a sustainable society, and there is a demand for woven and knitted fabrics as environmentally friendly materials. Because worker uniforms require the use of fabrics of the same specifications, replacing the woven and knitted fabrics used for uniforms with environmentally friendly materials is an effective way to achieve this goal. Methods for expressing colors and patterns on woven and knitted fabrics can be broadly divided into yarn dyeing, in which patterns are created by appropriately combining raw yarns dyed in multiple colors in advance and weaving and knitting them, and piece dyeing, in which plain woven and knitted fabrics are dyed after weaving and knitting. However, both yarn dyeing and piece dyeing require the use of various dyes and hot water treatment at high temperatures during the dyeing process, as well as the need to treat wastewater from the dyes, which results in high energy costs.

[0004] As mentioned above, white woven and knitted fabrics dyed to white have been proposed as white fabrics for use in lab coats. However, no white woven and knitted fabrics that can be used as undyed fabrics (fabric before dyeing), which are more environmentally preferable, have yet to be proposed. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Publication No. 2020-33654 [Patent Document 2] Japanese Patent Application Publication No. 48-62732 Summary of the Invention [Problem to be solved by the invention]

[0006] The technical object of the present invention is to solve the above problems and to provide a white woven fabric which is an undyed woven fabric, has sufficient whiteness without the need for dyeing it white, and can be suitably used as a woven fabric for white coats. [Means for solving the problem]

[0007] The inventors discovered that by using specific amounts of polyester filaments containing a certain amount or less of titanium oxide microparticles and specific amounts of polyester filaments containing a certain amount or more of titanium oxide, a pattern of filament arrangements with different degrees of transparency appears on the surface of the fabric, giving the fabric a three-dimensional feel and a stylish design, and thus making it possible to use the fabric as a white fabric without dyeing, and thus arrived at the present invention.

[0008] That is, the present invention provides the following (i) to (f). (i) A white woven fabric consisting of an undyed filament A made of polyester resin containing 0.1% by mass or less of titanium oxide microparticles, an undyed filament B made of polyester resin containing 1.5% by mass or more of titanium oxide microparticles, and a white conductive filament C, wherein in any square enclosed by 2.54 cm in the warp direction and 2.54 cm in the weft direction, filament A is contained at 40 to 55% by mass, filament B at 40 to 55% by mass, and filament C at 0.1 to 5% by mass, and both the warp and weft threads constituting the fabric contain filament A and filament B, and the cover factor of the fabric is 2000 to 3000 and the whiteness (WI) is 70 or more. (ii) A white woven fabric according to (i), in which the number of warp threads in the woven fabric is 90 to 130 threads / 2.54 cm, the number of weft threads is 70 to 100 threads / 2.54 cm, the fineness of filament A and filament B is 100 to 350 dtex, and the difference in fineness between filament A and filament B is 20 dtex or less. (c) A white woven fabric as described in (a), in which there are two or more intersections between a warp thread made of two or more parallel filaments A and a weft thread made of two or more parallel filaments A in any square of 2.54 cm in the warp direction and 2.54 cm in the weft direction. (ii) A white woven fabric as described in (i) having a tear strength of 20 N or more in the warp direction and a tear strength of 15 N or more in the weft direction. [Effects of the Invention]

[0009] The white woven fabric of the present invention has excellent whiteness even when undyed, and the arrangement pattern of filaments with different transparency appears on the surface of the fabric, giving the fabric a three-dimensional feel and design. Therefore, the white woven fabric of the present invention can be used without dyeing, and can be used as a sewn product suitable for various clothing applications, including uniforms. Furthermore, the white woven fabric of the present invention does not require dyeing, making it an environmentally friendly material that can reduce the energy costs required in the dyeing process. [Brief explanation of the drawings]

[0010] [Figure 1] FIG. 1 is a schematic diagram showing one embodiment (butcher weave) of the weave of a white woven fabric of the present invention. [Figure 2] 1 is a schematic diagram showing one embodiment (lip weave) of the weave of a white woven fabric of the present invention. [Figure 3] FIG. 1 is a schematic diagram showing the weave structure of the white woven fabric obtained in Example 1. DETAILED DESCRIPTION OF THE INVENTION

[0011] The white woven fabric of the present invention will now be described. The white woven fabric of the present invention is an undyed woven fabric intended to be used without dyeing, and has excellent whiteness even when undyed. To produce such a woven fabric, undyed filaments A made of polyester resin containing 0.1% by mass or less of titanium oxide microparticles and undyed filaments B made of polyester resin containing 1.5% by mass or more of titanium oxide microparticles are used.

[0012] The polyester resin forming filaments A and B is preferably polyalkylene terephthalate or polyalkylene naphthalate, specifically polyethylene terephthalate (PET) or polybutylene terephthalate (PBT). As described below, filament A is preferably one with excellent transparency, and therefore is preferably PET or PBT containing no copolymerization component. Filament B is preferably a white yarn with concealed transparency, and therefore may contain a copolymerization component within a range that does not impair the effect. Examples of the copolymerization component include aromatic dicarboxylic acid components such as 5-sodium sulfoisophthalic acid, isophthalic acid, phthalic anhydride, and naphthalenedicarboxylic acid; aliphatic dicarboxylic acid components such as adipic acid and sebacic acid; glycol components such as diethylene glycol, propylene glycol, 1,4-cyclohexanedimethanol, and alkylene oxide adducts of bisphenol S; and hydroxycarboxylic acid components such as 4-hydroxybenzoic acid and ε-caprolactone.

[0013] Filament A contains 0.1% by mass or less of titanium oxide fine particles in the polyester resin. The content of titanium oxide fine particles in the polyester resin is preferably 0% by mass (no titanium oxide particles), and even if present, it is preferably less than 0.08% by mass. In other words, filament A is preferably a yarn having the transparency inherent to polyester resin.

[0014] Filament B contains 1.5% by mass or more of titanium oxide fine particles in the polyester resin. The content of titanium oxide fine particles in the polyester resin is preferably 1.5 to 5.0% by mass, and more preferably 1.8 to 3.5% by mass. In other words, filament B is preferably a white yarn that conceals the inherent transparency of the polyester resin.

[0015] In the white woven fabric of the present invention, the fineness of filament A and filament B is not limited as long as it is within a range suitable for clothing applications. However, in order to allow the arrangement pattern of filaments with different transparency to appear on the surface of the fabric, giving the fabric surface a three-dimensional feel and design, it is preferable that both filament A and filament B be 100 to 350 dtex, and the difference in fineness between filament A and filament B be 20 dtex or less. The fineness of filament A and filament B is preferably 120 to 300 dtex, and the difference in fineness between filament A and filament B is preferably 15 dtex or less. To achieve a better appearance, it is particularly preferable that filament A and filament B have the same fineness.

[0016] As described above, the fabric used in the white coat is required to have antistatic properties, and therefore the white fabric of the present invention contains white conductive filaments C. The white conductive filament C is not limited as long as it is a conductive filament that is white in appearance, but fibers containing white conductive microparticles are known, and preferred examples include core-sheath composite fibers in which a polyester resin containing white conductive microparticles is arranged in the core and a polyester resin not containing white conductive microparticles is arranged in the sheath.

[0017] Examples of white conductive fine particles include particles in which inorganic fine particles such as titanium oxide, zinc oxide, calcium oxide, magnesium oxide, calcium carbonate, zinc carbonate, calcium sulfate, barium sulfate, alumina, and silica are coated with tin oxide.

[0018] It is particularly preferred to use PBT resin as the polyester resin for the core, and aromatic copolymer polyester resins can be used as the polyester resin for the sheath, among which poly(ethylene terephthalate / isophthalate) resin copolymerized with isophthalic acid is preferred in terms of versatility and fiber properties. In the white woven fabric of the present invention, from the viewpoint of making the white conductive filament C less noticeable in appearance, it is preferred to use a core-sheath type composite fiber containing the above-mentioned white conductive fine particles only in the core, and the polyester resin for the sheath is the same as the polyester resin forming filament B, i.e., a conductive filament using a polyester resin with the same resin components and titanium oxide amount as filament B. Specifically, it is preferred to use "Megana" (product name: 28T2-SX1E) manufactured by Unitika Trading Co., Ltd. The fineness of the white conductive filament C is preferably 20 to 50 dtex, and more preferably 24 to 40 dtex.

[0019] Furthermore, in order to make the white woven fabric of the present invention have a three-dimensional and design-oriented surface with an arrangement pattern of filaments with different degrees of transparency appearing on the surface of the fabric, it is necessary that any square enclosed by 2.54 cm in the warp direction x 2.54 cm in the weft direction contains 40 to 55 mass% of filament A, 40 to 55 mass% of filament B, and 0.1 to 5 mass% of filament C, and that both the warp and weft threads constituting the woven fabric contain filament A and filament B.

[0020] Generally, to create a three-dimensional or designed fabric surface, threads of different colors are used or the weave of the fabric is adjusted, but in the present invention, filaments A and B have different translucencies, and the difference in their light reflection makes it possible to create a three-dimensional effect. Furthermore, filaments A and B are used in both the warp and weft of the fabric, and approximately equal amounts of filaments A and B are used in any given location on the fabric, so that an arrangement pattern with a three-dimensional or designed effect appears on the surface of the fabric, even though the threads are undyed, and the desired appearance of the present invention can be achieved.

[0021] Furthermore, in the present invention, the use of approximately equal amounts of filament A and filament B enables the fabric to have excellent whiteness. In the present invention, since filament A is a highly transparent fiber, if it is contained unevenly in a specific area on the surface of the fabric, the transparency in that area will be high, i.e., the whiteness will be low, and the fabric may be excessively see-through, making it unsuitable for clothing use as a white fabric. Therefore, in the present invention, it is necessary for filament A and filament B to satisfy the above-mentioned specific content ratio, and for the low-transparency filament B to be present in an appropriate amount in any range of the fabric, in order to increase whiteness.

[0022] In the white woven fabric of the present invention, the filaments A and B are present in a state of being arranged separately in the woven fabric so as to satisfy the above conditions, and are not present in a state of being combined with the filaments A and B, such as in the form of a plied or covered yarn. As will be described later, it is preferable to use the white conductive filament C by plied or covered with the filament A or B. Furthermore, the filaments A and B may be raw yarns that have not been subjected to false twisting, false twisted yarns, or yarns twisted from raw yarns or false twisted yarns.

[0023] The warp and weft yarns used in the present invention may contain fibers other than filament A, filament B, and filament C, as long as the effects of the present invention are not impaired. Examples of other fibers include synthetic fibers such as polyester fibers and polyamide fibers, regenerated fibers such as rayon, and natural fibers such as cotton and wool. The content of other fibers is preferably 10% by mass or less, more preferably 5% by mass or less, and even more preferably 1% by mass or less.

[0024] The white woven fabric of the present invention has a cover factor (hereinafter sometimes referred to as CF) of 2000 to 3000, preferably 2200 to 2800. When the CF is 2000 or more, the weaving points are sufficiently dense, resulting in sufficient whiteness and excellent durability. On the other hand, when the CF exceeds 3000, the constraint by the weaving points becomes too strong, and the tear strength and burst strength of the woven fabric tend to decrease. CF is a numerical representation of the density of a woven fabric and is calculated using the following formula (1).

[0025] CF=WAD×DTA 1 / 2 +WED×DTE 1 / 2 (1) DTA: warp multifilament fineness (dtex) DTE: Weft multifilament fineness (dtex) WAD: Warp density (threads / 2.54cm) WED: Weft density (threads / 2.54cm) The fineness of the multifilament yarn is measured and calculated according to the method specified in 8.3.1 Correct Fineness of JIS L-1013: 2010. In addition, in any square of 2.54 cm in the warp direction and 2.54 cm in the weft direction of a white woven fabric, the average value of the fineness of the multifilament yarns of all warp yarns placed is defined as DTA, and the average value of the fineness of the multifilament yarns of all weft yarns placed is defined as DTE. The warp density and weft density are measured and calculated in accordance with JIS L 1096:2010 8.6.1A. Both warp density and weft density refer to the finished weave density.

[0026] The white woven fabric of the present invention preferably has a warp count of 90 to 130 threads / 2.54 cm and a weft count of 70 to 100 threads / 2.54 cm, and more preferably has a warp count of 100 to 120 threads / 2.54 cm and a weft count of 75 to 95 threads / 2.54 cm.

[0027] The weave of the white woven fabric of the present invention is preferably a weave that does not make the fabric thick and does not have a double or triple overlap weave, but is a normal single weave that is not a overlap weave. The weave is not particularly limited as long as it is a single weave that is not a overlap weave, and examples thereof include plain weave, twill weave, and satin weave, among which plain weave is preferred.

[0028] In the white woven fabric of the present invention, it is preferable that there are two or more intersections between a warp yarn formed by arranging two or more parallel filaments A and a weft yarn formed by arranging two or more parallel filaments A in any square of 2.54 cm in the warp direction × 2.54 cm in the weft direction. Of these, it is preferable that there are three or more intersections, and more preferably four or more intersections. Furthermore, when a composite yarn obtained by plying or covering filament A and white conductive filament C is used as a yarn to be pulled together, the composite yarn is counted as one filament A. In other words, when one filament A and one composite yarn are pulled together and used as a warp yarn, in the present invention, the filament A is treated as a warp yarn made up of two pulled together.

[0029] In the present invention, the presence of the intersecting portions can improve the strength of the woven fabric and also give the surface of the white woven fabric of the present invention a more three-dimensional design. The intersecting portion is the portion indicated by the reference numeral 1 in Figures 1 and 2. The number of threads to be aligned can be any combination, such as 2 warps x 2 wefts, 2 warps x 3 wefts, 3 warps x 2 wefts, or 3 warps x 3 wefts.

[0030] The white woven fabric of the present invention may be subjected to post-processing such as antibacterial processing, dyeing processing, water-repellent back-water-absorbing processing, UV-cut processing, heat-storing processing, bacteriostatic processing, antibacterial and deodorizing processing, deodorizing processing, stain-resistant processing, mosquito-repellent processing, calendaring processing, printing processing, etc. Furthermore, the filaments A, B, and C used in the white woven fabric of the present invention may be previously imparted with the above-mentioned functionality.

[0031] As an index showing that the white woven fabric of the present invention has excellent whiteness, the whiteness (WI) is 70 or more, and preferably 73 or more. The whiteness in this invention is measured using a Macbeth CE-3100 spectrophotometer to measure the WI-Taube value. Specifically, it is measured under conditions including a 2-degree field of view, a D65 light source, specular gloss, and UV light. The dry sample is a sample (woven fabric) that has been left to stand for 24 hours in an environment of 20°C and 65% RH.

[0032] The tear strength of the white woven fabric of the present invention in the warp direction is preferably 20 N or more, more preferably 25 N or more. The tear strength in the weft direction is preferably 15 N or more, more preferably 20 N or more. In the present invention, the tear strength of woven or knitted fabrics is a value measured based on "8.17.4 Method D (Pendulum Method)" of "JIS L 1096:2010 Fabric Testing Methods for Woven and Knit Fabrics."

[0033] The white woven fabric of the present invention is an environmentally friendly material that can be used without dyeing, and because it has a three-dimensional effect and design properties, it can be used as a woven fabric suitable for various clothing applications, including uniforms. [Example]

[0034] Examples are shown below, but the present invention is not limited to the following examples.

[0035] The methods for measuring or evaluating each physical property are as follows. <Fineness> The total fineness (rounded to the first decimal place) was measured according to the method specified in "8.3.1 Correct fineness" of "JIS L-1013:2010 Test method for chemical fiber filament yarn." <Whiteness (WI)> The white fabric thus obtained was used for calculation according to the above method. <Cover Factor> The white fabric thus obtained was used for calculation according to the above method. <Number of intersections of warp and weft yarns with two or more strands of filament A> A surface photograph of the resulting 2.54 cm x 2.54 cm square test piece of the white woven fabric was taken using a digital microscope VHX-900 manufactured by Keyence Corporation, and the number of particles was counted. <Tear strength> The obtained white woven fabric was measured based on "8.17.4 D method (pendulum method)" of "JIS L 1096:2010 Fabric testing methods for woven and knitted fabrics." The tear strength was measured in both the warp and weft directions.

[0036] Example 1 Filament A was a 167 dtex / 48 fil polyester filament containing no titanium oxide, filament B was a 167 dtex / 144 fil polyester filament containing 2% by mass of titanium oxide, and white conductive filament C was "Megana" (product name: 28T2-SX1E) manufactured by Unitika Trading Co., Ltd. Next, filament A and filament C were twisted together to obtain twisted yarn D. Next, filament A, filament B, and doubled-twisted yarn D were warped, and the warp beam was then set on an air jet loom (manufactured by Ishikawa Seisakusho Co., Ltd.), and filament A and filament B were woven as wefts to weave a plain weave greige fabric in such a way that the warp yarns, each consisting of two filaments A pulled together, and the weft yarns, each consisting of two filaments A pulled together, were arranged at regular intervals, as shown in Figure 3. As shown in Figure 3, the first and second rows from the left of the warp yarns are two warp yarns pulled together, and the doubled-twisted yarn D obtained above was used for one of these (the second row).

[0037] The resulting grey fabric was subjected to the usual scouring, bleaching, and mercerization to obtain an undyed white fabric. The resulting white fabric had a finished weave density of 110 warp threads / 2.54 cm and 85 weft threads / 2.54 cm, and had 16 intersections of warp threads made of two parallel filaments A and weft threads made of two parallel filaments A in any square of 2.54 cm in the warp direction and 2.54 cm in the weft direction.

[0038] The evaluation results of the examples are shown in Table 1.

[0039] [Table 1]

[0040] As is clear from Table 1, the white woven fabric obtained in Example 1 satisfied the characteristic values ​​specified in the present invention, and was excellent in whiteness even without dyeing, and had a three-dimensional effect and designability due to the difference in transparency between filaments A and B. Furthermore, since the woven fabric had portions where warp yarns and weft yarns formed by aligning two filaments A crossed each other, it had designability and excellent tear strength. [Explanation of symbols]

[0041] 1 The area where two parallel warp threads intersect with two parallel weft threads.

Claims

1. An undyed woven fabric comprising an undyed filament A made of polyester resin containing 0.1% by mass or less of titanium oxide fine particles, an undyed filament B made of polyester resin containing 1.5% by mass or more of titanium oxide fine particles, and a white conductive filament C, In any square having an area of ​​2.54 cm in the warp direction and 2.54 cm in the weft direction, the filament A is contained in an amount of 40 to 55% by mass, the filament B is contained in an amount of 40 to 55% by mass, and the filament C is contained in an amount of 0.1 to 5% by mass, In addition, both the warp and weft yarns constituting the woven fabric contain filaments A and B, The white woven fabric has a cover factor of 2000 to 3000 and a whiteness (WI) of 70 or more.

2. The number of warp threads in the woven fabric is 90 to 130 threads / 2.54 cm, and the number of weft threads is 70 to 100 threads / 2.54 cm, 2. The white woven fabric according to claim 1, wherein the fineness of the filaments A and B is 100 to 350 dtex, and the difference in fineness between the filaments A and B is 20 dtex or less.

3. 2. The white woven fabric according to claim 1, wherein there are two or more intersections between a warp yarn formed by arranging two or more filaments A and a weft yarn formed by arranging two or more filaments A in a square of 2.54 cm in the warp direction and 2.54 cm in the weft direction.

4. 2. The white woven fabric according to claim 1, wherein the tear strength in the warp direction is 20 N or more and the tear strength in the weft direction is 15 N or more.

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