Electrostatically dissipative fabric and electrostatically dissipative clothing

Abstract

To provide an antistatic knitted fabric and an antistatic clothing that are versatile as clothing and have high antistatic property.SOLUTION: An antistatic knitted fabric 1 includes conductive yarns 2c, 3 containing conductive fibers and non-conductive yarns 2a, 2b containing no conductive fiber. The knitted fabric 1 is a circular knit to which warp is inserted. The conductive yarn 3 in warp direction (wale direction) is arranged at an interval by warp insertion, while the conductive yarn 2c in weft direction (course direction) is arranged between a plurality of non-conductive yarns 2a, 2b as a knit loop. In a manufacturing method of this knitted fabric, the knitted fabric is knitted by using a circular knitting machine, feeding the conductive yarn between the plurality of non-conductive yarns to form the knit loop and make a ground texture in the weft direction (course direction), and feeding the conductive yarn in the warp direction (wale direction) at an interval by warp insertion.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to an antistatic fabric and antistatic clothing suitable for work clothes, uniforms, and the like.

Background Art

[0002] Conductive clothing has been used to prevent electrostatic dust collection in workplaces and clean rooms where electrostatic electricity is an obstacle to components and chemicals. Conductive clothing has conductive yarns woven into the fabric for electrostatic countermeasures. For example, conductive yarns are woven in stripes or grids at regular intervals to prevent electrostatic dust collection by neutralizing static electricity through corona discharge. In recent years, as required characteristics of electrostatic management, the surface resistance value of conductive clothing has been regulated in IEC (International Electrotechnical Commission) 61340-5-1 and 5-2, and surface conductivity across the entire clothing is required. Patent Document 1 proposes a fabric using a yarn obtained by double covering a polyester filament yarn with a conductive yarn and a yarn obtained by single covering a polyester filament yarn with a conductive yarn. Patent Document 2 proposes a uniform fabric using a double covering yarn in which a polyethylene terephthalate yarn is arranged as the core and a polybutylene terephthalate conductive yarn is arranged as the sheath.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, conventional antistatic fabrics are woven fabrics and have problems in versatility. Also, simply making a conductive yarn into a knitted fabric results in a poor antistatic effect, and improvement has been demanded.

[0005] In order to solve the above problems, the present invention provides an antistatic knitted fabric and antistatic clothing that are versatile as clothing and have high antistatic properties.

Means for Solving the Problems

[0006] The antistatic knitted fabric of the present invention is an antistatic knitted fabric containing conductive yarns containing conductive fibers and non-conductive yarns not containing conductive fibers, wherein the knitted fabric is a warp-inserted circular knitted fabric, and the conductive yarns in the warp direction (wale direction) are arranged at intervals by warp insertion, and the conductive yarns in the weft direction (course direction) are arranged as knit loops between a plurality of non-conductive yarns and the antistatic fabric has an electrical resistance value between two points measured as defined in IEC (International Electrotechnical Commission) 61340-5-1 of 1×10 5 ~1×10 11 Ω, and the non-conductive yarn is at least one selected from cellulose fiber spun yarn, blended yarn of polyester fiber and cellulose fiber, and polyester stretch fiber yarn characterized in that.

[0007] The method for manufacturing the antistatic knitted fabric of the present invention is a method for manufacturing an antistatic knitted fabric containing conductive yarns containing conductive fibers and non-conductive yarns not containing conductive fibers, using a circular knitting machine, supplying conductive yarns between a plurality of non-conductive yarns in the weft direction (course direction) to form knit loops to create a ground fabric, and supplying the conductive yarns in the warp direction (wale direction) by warp insertion at intervals characterized by knitting the knitted fabric.

[0008] The clothing of the present invention is clothing containing the above antistatic knitted fabric.

Effects of the Invention

[0009] The present invention provides an antistatic knitted fabric and antistatic clothing that are versatile as clothing and have high antistatic properties by using a warp-inserted circular knitted fabric containing conductive yarns and non-conductive yarns, with the conductive yarns arranged at intervals in the warp and weft directions. That is, it is a warp-inserted circular knitted fabric containing a conductive yarn containing a conductive fiber and a non-conductive yarn not containing a conductive fiber. The conductive yarns in the warp direction (wale direction) are arranged at intervals by warp insertion, and the conductive yarns in the weft direction (course direction) are arranged as knit loops between a plurality of non-conductive yarns. As a result, a portion where the conductive yarns in the warp and weft directions intersect is formed, and at least a part of this intersection is electrically short-circuited, enabling high antistatic properties. Also, the knitted fabric (knit) can be made into clothing such as a knit shirt or polo shirt, and has high versatility.

Brief Description of the Drawings

[0010]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Embodiments for Carrying Out the Invention

[0011] The antistatic knitted fabric of the present invention is an antistatic knitted fabric containing a conductive yarn containing a conductive fiber and a non-conductive yarn not containing a conductive fiber. The knitted fabric is a warp-inserted circular knitted fabric. The conductive yarns in the warp direction (wale direction) are arranged at intervals by warp insertion, and the conductive yarns in the weft direction (course direction) are arranged as knit loops between a plurality of non-conductive yarns. Thereby, the conductive yarns in the warp and weft directions are arranged in a lattice pattern, and at least a part of this intersection is electrically short-circuited, enabling high antistatic properties.

[0012] The conductive yarns are arranged by inserting warp yarns at a rate of 1 yarn per 3 mm to 25 mm, preferably 1 yarn per 4 mm to 15 mm, in the warp direction (wale direction), and are preferably arranged as knit loops at a rate of 1 yarn per 3 mm to 15 mm, preferably 1 yarn per 3 mm to 10 mm, in the weft direction (course direction). The knit loops in the weft direction (course direction) are formed of conductive yarns and non-conductive yarns. Thereby, the electrical resistance value between two points by the measurement defined in IEC (International Electrotechnical Commission) 61340-5-1 is 1×10 5 ~1×10 11 Ω.

[0013] The warp-inserted circular knitting is preferably an interlock knitting of a spun yarn and a filament yarn. Thereby, a knitted fabric having the advantages of both the spun yarn and the filament yarn can be obtained. Specifically, a balance is achieved in terms of sweat absorption, quick drying, stretchability, comfort, etc., it can be machine-washed at home, and the wearing feeling is also good.

[0014] The conductive yarn is a core-sheath composite conductive yarn, and it is preferable that the core part is a blended yarn containing polyester fiber and cellulose fiber and / or a polyester stretch fiber yarn, and the sheath part is a conductive yarn. The core part is particularly preferably a blended yarn of polyester and cotton. Examples of the polyester stretch fiber yarn include a false-twisted yarn of polyethylene terephthalate multifilament yarn, a polyester conjugate multifilament yarn, etc. Examples of the conductive yarn for the sheath part include "Kuracarb" manufactured by Kuraray Co., Ltd., "Beltron" manufactured by KB Seiren Co., Ltd., etc. In order to arrange the conductive yarn in the sheath part, the conductive yarns of the warp and weft are likely to be short-circuited and the antistatic effect is high.

[0015] The non-conductive yarn is preferably at least one selected from cellulose fiber spun yarns, blended yarns of polyester fiber and cellulose fiber, and polyester stretch fiber yarns. Cellulose fibers have good sweat absorption and comfort, and polyester fibers have good quick drying, comfort, and wrinkle resistance. Cotton is preferred as the cellulose fiber.

[0016] As the mixing ratio of each material, as the ratio of polyester fiber, cotton and the conductive yarn in the sheath part, 30 to 85 wt% of polyester fiber, 13 to 70 wt% of cotton, and 1 to 4 wt% of conductive yarn are preferably well-balanced.

[0017] The core-sheath composite conductive yarn is preferably at least one selected from single covering yarn and double covering yarn. Thereby, a conductive yarn with high strength is obtained.

[0018] In the static electricity control fabric of the present invention, the conductive yarn is arranged by inserting warp yarns in the warp direction (weft direction), and in the weft direction (course direction), it is arranged as knit loops. Since the knit loops are formed of conductive yarns and non-conductive yarns, it has excellent elongation and air permeability. In particular, when a stretch material is used as all or part of the non-conductive yarn, the elongation rate is 5% to 30%, preferably 10% to 20% in both the warp and weft directions, and the air permeability is 80 cm 3 / cm 2 ·s to 250 cm 3 / cm 2 ·s, preferably 100 cm 3 / cm 2 ·s to 200 cm 3 / cm 2 ·s.

[0019] The static electricity control fabric of the present invention has an electrical resistance value between two points measured according to IEC (International Electrotechnical Commission) 61340-5-1 of 1×10 5 ~1×10 11 Ω, more preferably 1×10 5 ~1×10 9 Ω, and even more preferably 7.5×10 5 ~3.5×10 7 Ω. Thereby, a fabric with a high static electricity control effect is obtained.

[0020] The static electricity control clothing of the present invention includes the above-mentioned static electricity control fabric. The clothing is suitable for various shirts such as knit shirts, polo shirts, T-shirts, working shirts, and uniform shirts, uniforms, work clothes, student uniforms, jackets, blazers, slacks, skirts, work clothes, etc.

[0021] The antistatic knitted fabric of the present invention may have any knitted structure, but as an example, it is made of a warp-inserted plain knitted fabric (mixed jersey). The mass per unit area (weight) of the knitted fabric is 50 to 500 g / m 2 is preferable, and more preferably 80 to 450 g / m 2 and particularly preferably 100 to 400 g / m 2 It is.

[0022] The method for producing the antistatic knitted fabric of the present invention involves preparing conductive yarns containing conductive fibers and non-conductive yarns not containing conductive fibers, using a circular knitting machine, feeding one conductive yarn between multiple non-conductive yarns in the weft direction (course direction) to form knit loops and create a ground structure, and feeding the conductive yarns in the warp direction (wale direction) by warp insertion at intervals.

[0023] The breathable knitted fabric of the present invention will be described below with reference to the drawings. In the following description of the drawings, the same reference numerals indicate the same objects. FIG. 1 is a knit structure diagram of an antistatic knitted fabric 1 according to one embodiment of the present invention. In this antistatic knitted fabric 1, knit loops are composed of nonconductive yarns 2a, 2b and conductive yarn 2c. The nonconductive yarns 2a, 2b are arranged alternately. The conductive yarn 3 inserted as a warp yarn is inserted by crossing the nonconductive yarns 2a, 2b and conductive yarn 2c that constitute the knit loops one by one. As an example, the nonconductive yarns 2a, 2b and the conductive yarns 2c, 3 use single covering yarns shown in FIG. 2A below or double covering yarns shown in FIG. 2B below. The knitted fabric of this embodiment is a warp-inserted plain knitted fabric (mixed jersey). As an example, the nonconductive yarns 2a, 2b are as follows: - Blended yarn containing polyester staple fiber and cellulose staple fiber - Blended yarn containing polyester staple fiber and cellulose staple fiber - Blended yarn containing polyester filaments and cellulose staple fibers - Interlaced yarn containing polyester filament and cellulose filament Polyester stretch fiber yarn (such as false twist multifilament yarn)

[0024] Figure 2A is a schematic cross-sectional view of a single-covered yarn 4 according to an embodiment of the present invention. One non-conductive yarn 6 of the sheath is wound around the conductive yarn 5 of the core. The twist coefficient K of the non-conductive yarn 6 of the sheath is preferably 500 to 600. Figure 2B is a schematic cross-sectional view of a double-covered yarn 7 according to an embodiment of the present invention. Two non-conductive yarns 9 and 10 of the sheath are wound around the conductive yarn 8 of the core in the S direction and the Z direction. The primary twist coefficient K1 of the non-conductive yarn 9 of the sheath is preferably 500 to 600, and the secondary twist coefficient K2 of the non-conductive yarn 10 is preferably 550 to 650. As an example, the core yarn and the sheath yarn are as follows. (1) Core yarn · Blended yarn containing polyester staple fiber and cellulose staple fiber · Spun cross-twisted yarn containing polyester staple fiber and cellulose staple fiber · Spun cross-twisted yarn containing polyester filament and cellulose staple fiber · Interlaced yarn containing polyester filament and cellulose filament · Polyester stretch fiber yarn (such as false-twisted multifilament yarn) (2) Sheath yarn · Conductive yarn made of multifilament yarn

[0025] Figure 3 is a plan photograph of an antistatic fabric according to an embodiment of the present invention. The gray part is the knitted part of the non-conductive yarn, and the black part is the part of the conductive yarn. Figure 4 is a plan photograph of an antistatic fabric according to another embodiment of the present invention. The gray part is the knitted part of the non-conductive yarn, and the black part is the part of the conductive yarn. As is clear from Figures 3 to 4, in the antistatic fabric of the present invention, the conductive yarns are arranged at intervals in the warp direction and the weft direction. Since this lattice-like conductive yarn is short-circuited at the intersections, the antistatic property is good.

Examples

[0026] The present invention will be described more specifically by the following examples. Note that the present invention is not limited to the following examples. Each evaluation in the examples is as follows. <Antistatic property> The two-point electrical resistance value specified in IEC (International Electrotechnical Commission) 61340-5-1 was measured. For the knitted fabric, this measurement was performed at an ambient temperature of 25°C and a relative humidity of 47% RH, with three measurements taken, and the average value was calculated. For the shirt, this measurement was performed at an ambient temperature of 25°C and a relative humidity of 51% RH, with two measurements taken, and the average value was calculated. <Other physical properties> Other physical properties were measured according to the Japanese Industrial Standards (JIS) or measurements performed in the industry.

[0027] The materials used in the examples are as follows. In the following, unless otherwise specified, polyester is polyethylene terephthalate (PET). <Conductive yarn: warp insertion yarn and knit loop> The core is a single blended yarn (cotton count 34) of 65% polyester staple fiber and 35% cotton by mass, and the sheath is a core-sheath composite conductive yarn made by doubly covering two strands of Kuraray's "Curacarbo" (conductive filament yarn). <Non-conductive yarn 1: Non-stretch material> One strand of 100% cotton combed spun yarn (cotton count 30) was used. <Non-conductive yarn 2: Stretch material> One strand of polyester multifilament false twist woolly yarn, 165 decitex, was used.

[0028] Example 1 Using a 30-inch, 26-gauge circular knitting machine, non-conductive yarn 1 and non-conductive yarn 2 were interwoven into knit loops to form a plain knit (interwoven jersey) structure, conductive yarn was supplied as a warp insertion yarn at a pitch of 10 mm in the warp direction, and conductive yarn was supplied as a knit loop at a pitch of 10 mm in the weft direction to knit a knitted fabric (grey fabric). The knit loops were made by alternately interweaving non-conductive fiber 1 and non-conductive fiber 2, and after repeating this eight times (a total of 16 courses), one conductive thread and one non-conductive fiber 2 were inserted, making a total of 18 courses into one repeat. This knitted fabric (grey fabric) was washed in hot water, mercerized, dyed, and tentered according to a standard method. The mass per unit area (weight) of the obtained knitted fabric was 160 g / m2 and the antistatic property was as shown in Table 1 below.

[0029] (Example 2) The conductive yarn was supplied as the warp inserting yarn at a pitch of 10 mm in the warp direction, and the conductive yarn was supplied as the knit loop at a pitch of 5 mm in the weft direction, and the same procedure as in Example 1 was carried out. The knit loop was formed by alternately interlacing the non-conductive fiber 1 and the non-conductive fiber 2, and after repeating this five times (a total of 10 courses), one conductive yarn and one non-conductive fiber 2 were inserted, and a total of 12 courses were defined as one repeat. The mass (areal density) per unit area of the obtained knitted fabric was 165 g / m 2 and the physical properties and antistatic property were as shown in Table 1 below.

[0030]

Table 1

[0031] As is clear from Table 1, the knitted fabrics of the examples of the present invention had good antistatic properties. In addition, it was confirmed that the other physical properties were also sufficiently practical as knitted fabrics. Next, using the knitted fabrics of the respective examples, shirts were sewn. Fig. 5 shows the measurement points when measuring the electrical resistance value between two points of this shirt. Each numerical value is a measurement point. The applied voltage was 100 V, and the value after energization for 10 seconds was measured. The electrical resistance value between two points of this shirt is shown in Table 2.

[0032]

Table 2

[0033] As is clear from Table 2, the antistatic property of the shirt was good. In the wearing test of this shirt, no electrostatic charging was observed during the drying period. In addition, the balance of sweat absorption, quick drying, stretchability, comfort, etc. was achieved, it was possible to wash at home, and the wearing feeling was also good, and it was a shirt that was easy for movement and working operations.

Industrial Applicability

[0034] The knitted fabric of the present invention is suitable for various shirts such as knit shirts, polo shirts, T-shirts, working shirts, and uniform shirts, uniforms, work clothes, student uniforms, jackets, blazers, slacks, skirts, work clothes, and the like.

Explanation of Signs

[0035] 1 Conductive knitted fabric 2a, 2b Non-conductive yarn (knit loop) 2c Conductive yarn (knit loop) 3 Conductive yarn (warp insertion yarn) 4 Single covering yarn 5, 8 Conductive yarn 6, 9, 10 Non-conductive yarn 7 Double covering yarn

Claims

1. An antistatic knitted fabric comprising a conductive yarn containing conductive fibers and a non-conductive yarn not containing conductive fibers, wherein the knitted fabric is a warp-inserted circular knitted fabric, the conductive yarns in the warp direction (wale direction) are arranged by warp insertion at intervals, the conductive yarns in the weft direction (course direction) are arranged as knit loops between a plurality of non-conductive yarns, the antistatic knitted fabric has a two-point electrical resistance value of 1×10 5 to 1×10 11 Ω as measured according to IEC (International Electrotechnical Commission) 61340-5-1, and the non-conductive yarn is at least one selected from cellulose fiber spun yarns, blended yarns of polyester fibers and cellulose fibers, and polyester stretch fiber yarns. An antistatic knitted fabric characterized by the above.

2. The antistatic knitted fabric according to claim 1, wherein the conductive yarns are arranged by warp insertion at a rate of 1 per 3 mm to 25 mm in the warp direction (wale direction) and as knit loops at a rate of 1 per 3 mm to 15 mm in the weft direction (course direction).

3. The antistatic knitted fabric according to claim 1 or 2, wherein the conductive yarns in the warp direction and the weft direction are arranged in a lattice pattern, and at least a part of the intersections are short-circuited.

4. The antistatic knitted fabric according to any one of claims 1 to 3, wherein the warp-inserted circular knitted fabric is an interlaced fabric of spun yarns and filament yarns.

5. The antistatic knitted fabric according to any one of claims 1 to 4, wherein the conductive yarn is a core-sheath composite conductive yarn, the core part is at least one selected from blended yarns containing polyester fibers and cellulose fibers and polyester stretch fiber yarns, and the sheath part is a conductive yarn.

6. The antistatic knitted fabric according to any one of claims 1 to 5, wherein the conductive yarn is at least one selected from single covering yarns and double covering yarns.

7.

7. A method for manufacturing an antistatic knitted fabric according to any one of claims 1 to 6, comprising a conductive yarn containing conductive fibers and a non-conductive yarn not containing conductive fibers, using a circular knitting machine, in the weft direction (course direction), supplying a conductive yarn between a plurality of non-conductive yarns to form knit loops and create a ground fabric, the conductive yarns in the warp direction (wale direction) are supplied by inserting warp yarns at intervals, A method for manufacturing an antistatic knitted fabric, characterized by knitting the fabric.

8. Antistatic clothing comprising the antistatic knitted fabric according to any one of claims 1 to 7.

9. The antistatic clothing according to claim 8, wherein the antistatic clothing is a knitted shirt.

Images