WO2022215289A1

WO2022215289A1 - Antistatic warp knitted fabric

Info

Publication number: WO2022215289A1
Application number: PCT/JP2021/038296
Authority: WO
Inventors: 和広名本; 武史西山
Original assignee: ユニチカトレーディング株式会社
Priority date: 2021-04-09
Filing date: 2021-10-15
Publication date: 2022-10-13
Also published as: JP2022161787A; JP6932285B1; CN117098885A

Abstract

[Problem] To provide an antistatic warp knitted fabric that has antistatic properties in all directions from among the warp direction, the weft direction, and the bias direction of a knitted fabric, that is capable of effectively maintaining said antistatic properties in all directions even after repeated wearing and washing, and that makes it possible to obtain work clothing provided with both stretchability and favorable feeling of wear. [Solution] A warp knitted fabric which is formed from (a) a composite yarn including a conductive yarn and a first non-conductive yarn, and (b) a second non-conductive yarn, and which is characterized in that: (1) the composite yarn includes a yarn that constitutes at least one of the front surface and/or rear surface of the warp knitted fabric; (2) the composite yarn has one or more stitches formed by loops of adjacent composite yarns being overlapped with one another; (3) the variation value (MMD) in surface friction in the weft direction of the warp knitted fabric is 0.01-0.10; and (4) the surface resistance value in the warp direction, the weft direction, and the bias direction after ten washes, measured according to IEC 61340-5-1, is 1.0×10¹⁰Ω or less in each direction.

Description

Antistatic warp knitted fabric

The present invention provides an antistatic warp knitted fabric suitable for wearing at sites where high antistatic properties are required, such as factories that produce food, electrical appliances, precision equipment, etc., and work using it for clothing.

　Fabrics made of synthetic fibers are generally excellent in strength, durability, and low dust generation, and are widely used as work clothes. In particular, high antistatic properties are required in operations involving electronic devices, electronic components, or electronic materials. However, synthetic fibers are very prone to generate static electricity under low humidity, and there is a problem that the static electricity destroys the workpiece during work. For this reason, various antistatic fibers, woven and knitted fabrics, etc. have been proposed as countermeasures against static electricity.

Currently, there are properties defined in semi-international standards as standards for evaluating the antistatic properties of work clothing in the electronics industry. More specifically, it is preferred that the surface resistance value conforming to IEC61340-5-1, 5-2 is 1×10 ¹¹ Ω or less. As described above, the antistatic property means excellent performance in preventing electrification due to static electricity or the like.

Patent Literature 1 proposes antistatic work clothes suitable as work clothes for workers who handle electronic devices, electronic parts, or electronic materials as work clothes having antistatic properties that satisfy this standard. there is The antistatic work wear described in Patent Document 1 is sewn using a cloth obtained by weaving and knitting conductive composite yarns including conductive fibers in a grid pattern.

However, although the antistatic workwear described in Patent Document 1 has excellent antistatic properties, it lacks stretchability because it is made of woven fabric, and lacks comfort as workwear. In addition, since the conductive composite yarns containing conductive fibers are woven in a grid pattern, the antistatic property in the bias direction is insufficient.

In addition, Patent Document 2 proposes a knitted fabric having antistatic properties in all of the warp, weft, and bias directions of the knitted fabric.

However, in Patent Document 2, since the conductive fiber is used as it is (single substance), the conductive fiber tends to break frequently during warping or knitting, and it is difficult to obtain a knitted fabric with excellent quality with good productivity. is difficult. For this reason, the production of work clothes is costly. Furthermore, this knitted fabric is prone to breakage of the conductive fibers during washing or wearing, resulting in poor sustainability of the antistatic property.

In this way, work clothes used in various business fields, especially in the electronics industry, are worn and washed frequently, so that the antistatic properties do not deteriorate even after repeated wearing and washing, and therefore the durability ( There is a demand for a knitted fabric having excellent antistatic properties in terms of durability.

Japanese Unexamined Patent Application Publication No. 2008-7869 JP 2005-344245 A

Therefore, the main object of the present invention is to solve the above problems, and to have antistatic properties in all of the warp, weft and bias directions of the knitted fabric, and to Antistatic warp knitting that can obtain work clothes that maintain high antistatic properties in the direction of and even after repeated wearing or washing, and also have stretchability and good comfort. It is to provide the land.

The inventor of the present invention has conducted intensive research to solve the above problems, and has found that the above objects can be achieved by adopting a warp knitted fabric having a specific structure, and has completed the present invention.

That is, the present invention relates to the following antistatic warp knitted fabric.
1. A warp knitted fabric knitted with (a) a composite yarn containing a conductive yarn and a first non-conductive yarn and (b) a second non-conductive yarn, the requirements of (1) to (4) below:
(1) The composite yarn is included in the yarn that knits at least one of the surface and the back surface of the warp knitted fabric,
(2) the composite yarn has one or more stitches formed by overlapping loops of mutually adjacent composite yarns;
(3) The surface friction variation value (MMD) in the horizontal direction of the warp knitted fabric is 0.01 to 0.10, and (4) The vertical direction and horizontal direction measured by IEC61340-5-1 after 10 washes both the surface resistance values in the direction and the bias direction are 1.0×10 ¹⁰ Ω or less;
An antistatic warp knitted fabric characterized by satisfying
2. 2. The antistatic warp knitted fabric according to item 1, wherein the composite yarn is at least one selected from the group consisting of (i) plied yarn, (ii) covering yarn and (iii) interlaced yarn.
3. 3. The antistatic warp knitted fabric according to item 1 or 2, wherein the content of the conductive yarn in the total mass of the warp knitted fabric is 0.5 to 10.0% by mass.
4. 4. Any one of the above items 1 to 3, wherein the surface resistance values in the vertical direction, the horizontal direction, and the bias direction measured by IEC61340-5-1 after washing 100 times are all 1.0×10 ¹¹ Ω or less. Antistatic warp knitted fabric.
5. The maximum total fineness (A) of the yarns knitted into the stitches formed by overlapping the loops of the composite yarns, and the total total fineness of the yarns knitted into the other stitches. Item 2. The antistatic warp knitted fabric according to Item 1, wherein the difference (AB) from the minimum total fineness (B) is 200 dtex or less.
6. 6. The antistatic warp knitted fabric according to any one of Items 1 to 5, wherein the stitches formed by overlapping the loops of the composite yarns are included at a rate of 1 or more per 2 cm in the horizontal direction of the warp knitted fabric. .
7. 7. The antistatic warp knitted fabric according to any one of items 1 to 6, which is used for clothing.
8. Work clothes comprising the antistatic warp knitted fabric according to any one of the above items 1 to 7.

In the present invention, "after 10 washes" particularly means the state after repeating the washing operation 10 times according to the conditions of the Japanese Industrial Standard "JIS L 0217 103" method (household electric washing machine method). do. That is, it means the state after 10 consecutive cycles of a series of operations consisting of "washing", "rinsing", and "drying" under the above conditions. In addition, "after 100 washes" means the state after repeating the washing operation 100 times in accordance with the Japanese Industrial Standards "JIS L 0217 103" method (household electric washing machine method). That is, it means the state after 100 consecutive cycles of a series of operations consisting of "washing", "rinsing", and "drying" under the above conditions.

According to the present invention, the knitted fabric has antistatic properties in all of the warp, weft, and bias directions, and the antistatic properties in any of these directions are effective even after repeated wearing or washing. It is possible to provide an antistatic warp knitted fabric which can be maintained and which can provide work clothes having stretchability and good comfort.

That is, the antistatic warp knitted fabric of the present invention has excellent initial antistatic properties, and in addition, the antistatic properties do not easily decrease even after repeated wearing or washing, and it is possible to maintain good antistatic properties. can. In particular, the antistatic properties of the antistatic warp knitted fabric of the present invention can also hold values specified by quasi-international standards.

In addition, since the antistatic warp knitted fabric of the present invention is a knitted fabric, it has excellent stretchability compared to woven fabrics. That is, according to the present invention, it is possible to exhibit the above-mentioned high antistatic property and the like, and also to obtain the original characteristics of the knitted fabric.

Furthermore, in the antistatic warp knitted fabric of the present invention, the unevenness of the composite yarn is small and the knitted fabric surface is smooth, so that it is possible to provide clothes that are comfortable to wear.

The antistatic warp knitted fabric of the present invention having such characteristics can be used in various works such as the electronics industry that require countermeasures against static electricity, and is comfortable to wear when worn. Clothing can be conveniently provided.

1 is a knitting structure diagram showing one embodiment of a knitting structure of "a composite yarn containing a conductive yarn and a first non-conductive yarn" in the antistatic warp knitted fabric of the present invention. FIG. Fig. 2 is a knitting structure diagram showing another embodiment of a knitting structure of "a composite yarn containing a conductive yarn and a first non-conductive yarn" in the antistatic warp knitted fabric of the present invention. 10 is a knitting structure diagram showing a knitting structure of "a composite yarn containing a conductive yarn and a first non-conductive yarn" in the warp knitted fabric of Comparative Example 3. FIG. 1 is a diagram showing an example of a cross section of a conductive synthetic fiber used in the antistatic warp knitted fabric of the present invention; FIG. FIG. 4A shows an embodiment having an exposed portion of the conductive polymer portion on a portion of the circumference of the conductive synthetic fiber. FIG. 4B shows an embodiment having an exposed portion of the conductive polymer portion around the entire perimeter of the conductive synthetic fiber.

The antistatic warp knitted fabric of the present invention is a warp knitted fabric knitted with (a) a composite yarn containing a conductive yarn and a first non-conductive yarn and (b) a second non-conductive yarn, and has the following (1) Requirements for ~(4):
(1) The composite yarn is included in the yarn that knits at least one of the surface and the back surface of the warp knitted fabric,
(2) the composite yarn has one or more stitches formed by overlapping loops of mutually adjacent composite yarns;
(3) The surface friction variation value (MMD) in the horizontal direction of the warp knitted fabric is 0.01 to 0.10, and (4) The vertical direction and horizontal direction measured by IEC61340-5-1 after 10 washes It is characterized by satisfying the surface resistance value of 1.0×10 ¹⁰ Ω or less both in the direction and the bias direction.

The antistatic warp knitted fabric of the present invention is knitted from (a) a composite yarn containing a conductive yarn and a first non-conductive yarn and (b) a second non-conductive yarn.

First, the conductive thread will be explained. The conductive yarn mainly functions to develop antistatic properties in the antistatic warp knitted fabric of the present invention.

As the conductive thread, a synthetic fiber (conductive synthetic fiber) configured using a conductive polymer is preferable. A conductive polymer is a material obtained by blending conductive fine particles into a thermoplastic resin that is usually used to form fibers. That is, a resin composition containing a thermoplastic resin and conductive fine particles can be used as the conductive polymer.

Examples of conductive fine particles include, but are not limited to, powders of carbon materials such as conductive carbon black, various powders, powders of metals such as copper sulfide, zinc sulfide, and copper iodide, and powders of compounds thereof. Among these, conductive carbon black is preferred. The size and the like of the conductive fine particles can also be appropriately set according to the size and the like of the fibers, and are not particularly limited. Also, the content of the conductive fine particles is not particularly limited because it can be appropriately set according to the desired conductivity and the like.

Examples of thermoplastic resins include polyolefin polymers such as polyethylene and polypropylene; polyamide polymers such as nylon 6, nylon 66, nylon 4 and nylon 12; and polyester polymers such as polyethylene terephthalate, polybutylene terephthalate and polytetramethylene terephthalate. can be used. Among them, at least one polymer such as a polyester-based polymer or a polyamide-based polymer is preferable from the viewpoint of heat resistance.

The conductive synthetic fiber may be a fiber made of a single conductive polymer. It is preferably a fiber having a composite cross-sectional shape, which is composed of a flexible polymer portion. In this case, the above thermoplastic resin can be used for the conductive polymer portion or the non-conductive polymer portion.

When the content of the conductive fine particles is increased in order to improve conductivity, the strength or texture of the resulting fiber tends to be impaired. Alternatively, the texture can be kept good. As for the cross-sectional shape of the composite type, it is preferable that the conductive polymer is exposed on the fiber surface in the cross-sectional shape of the single fiber in order to improve the conductivity.

In this regard, Fig. 4 shows a cross-sectional example of a conductive synthetic fiber. The conductive synthetic fiber 10 shown in FIG. 4A includes a conductive polymer portion 10a and a non-conductive polymer portion 10b. As described above, it is preferable that the conductive polymer portion 10a is exposed on the surface of the conductive synthetic fiber. It is indicated by the ratio [(C1+C2+C3+C4)/C]×100(%) of the portion (total of arcs C1, C2, C3, and C4). The conductive synthetic fiber 10' shown in FIG. 4B includes a conductive polymer portion 10'a and a non-conductive polymer portion 10'b, and the conductive polymer portion is exposed around the entire circumference of the conductive synthetic fiber 10'. So the percentage is 100%.

In the present invention, the exposed portion of the conductive polymer portion preferably occupies 30% or more of the outer peripheral length, and more preferably occupies 50% or more of the outer peripheral length. 100% is most preferred.

In the present invention, a commercial product can also be used as the conductive yarn (especially the conductive yarn with a composite cross-sectional shape). For example, "Curacarbo" (trade name) manufactured by Kuraray Co., Ltd., "Beltron" (trade name) manufactured by KB Seiren, "Luana" (trade name) manufactured by Toray Industries, Inc., and "Megana" (trade name) manufactured by Unitika Trading. be done.

In general, by disposing the conductive yarn on the surface of the knitted fabric, the surface resistance value conforming to IEC61340-5-1 and 5-2 can be obtained with good results. However, in general, the conductive yarn has a small fineness and a low strength, so that if it is used alone, the problem of yarn breakage is likely to occur in the warping and knitting processes, making stable implementation difficult. In contrast, in the present invention, the conductive yarn is used together with the first non-conductive yarn to form a composite yarn such as a plied yarn, a mixed yarn, a covered yarn, etc., so that the above problems do not occur.

Next, the non-conductive threads (first non-conductive thread, second non-conductive thread) will be described. The non-conductive yarn is preferably obtained from a thermoplastic resin. For example, it can be formed from a resin composition containing no conductive fine particles and containing a thermoplastic resin. The thermoplastic resin is not particularly limited, and examples thereof include polyolefin polymers such as polyethylene and polypropylene, polyamide polymers such as nylon 6, nylon 66, nylon 4 and nylon 12, polyethylene terephthalate, polybutylene terephthalate, and polytetramethylene terephthalate. A polyester-based polymer such as can be used. Among these, polyester-based polymers are preferable from the viewpoint of heat resistance and the like.

As the non-conductive yarn, a fiber obtained by melt-spinning a resin composition containing a thermoplastic resin as described above, and a spun yarn obtained from multifilament or monofilament long fibers or short fibers is preferably used. can be done. By using long fibers as the fibers constituting the antistatic warp knitted fabric of the present invention, dust generation from the fibers can be reduced. Among them, polyester long fibers are preferred. As the polyester long fibers, for example, those obtained by melt-spinning a resin composition containing a polyester-based polymer can be suitably used.

In addition, the non-conductive yarn is not limited as long as it uses the thermoplastic resin described above. Also, the non-conductive yarn may be a composite fiber such as a core-sheath type or a side-by-side type. In the case of conjugated fibers, in addition to conjugated fibers using two or more kinds of different resins, conjugated fibers using two or more kinds of the same resins having different compositions, characteristic values, etc. can be used.

In the case of a conductive synthetic fiber having a composite cross-section, the combination of the polymer forming the conductive polymer portion and the polymer forming the non-conductive polymer portion may be a combination of the same types of polymers or a combination of different types of polymers. A combination may be used. In the present invention, a combination of polymers of the same type is preferred from the viewpoint of compatibility. Among them, as the thermoplastic resin, it is preferable to use at least one of polyester-based polymer, polyamide-based polymer, and the like.

Next, the composite yarn consisting of the conductive yarn and the first non-conductive yarn will be explained. The form of the composite yarn is preferably any one of plied yarn, covered yarn, interlaced yarn, and the like.

Although the plied yarn is not limited, for example, a conductive yarn and a first non-conductive yarn are twisted using a known yarn twisting machine such as a ring twisting machine, and the number of twists is 200 to 700 t / M. is preferred.

The covering yarn is not limited, but for example, a single covering yarn or double covering yarn using a conductive yarn as a core yarn and a first non-conductive yarn as a sheath yarn, and the number of twists is 200 to 700 t. /M is preferred.

The interlaced yarn is not limited, but for example, it is an interlaced yarn in which a conductive yarn is used as a core yarn, a first non-conductive yarn is used as a floating yarn, and both yarns are bound by an interlace nozzle with the force of air. It is preferable that the entanglement number is 30 to 100/m.

In the present invention, by using the conductive yarn as a composite yarn as described above together with the non-conductive yarn, instead of using the conductive yarn alone, it is possible to reduce the breakage of the conductive yarn. As a result, it is possible to improve the operability when obtaining a knitted fabric, and to effectively maintain the quality of the obtained knitted fabric and the antistatic property.

Although the single fiber fineness of the conductive yarn used for the composite yarn is not limited, it is preferably 4 to 20 dtex. Although the total fineness is not particularly limited, it is preferably 20 to 35 dtex.

Although the single fiber fineness of the first non-conductive yarn used for the composite yarn is not limited, it is preferably 1 to 5 dtex. Although the total fineness is not limited, it is preferably 30 to 120 dtex. Although the total fineness of the composite yarn is not limited, it is preferably 50 to 150 dtex.

The antistatic warp knitted fabric of the present invention is knitted from the above-described composite yarn and the second non-conductive yarn. Included in the yarn that knits at least one side of the back side. That is, in the antistatic warp knitted fabric of the present invention, the composite yarn is arranged so as to be exposed on the front surface and/or the back surface of the antistatic warp knitted fabric. As will be described later, the degree of exposure should be such that the surface resistance in the vertical, horizontal and bias directions measured according to IEC61340-5-1 is 1.0×10 ¹⁰ Ω or less after 10 washes. Good luck. However, the more the composite yarn is exposed, the more likely it is to be worn, resulting in a decrease in electrical conductivity. It is desirable to have the above surface resistance value provided that it satisfies the range of 10.

Here, the single fiber fineness of the second non-conductive yarn is not limited as long as it satisfies (AB) below, but it is usually preferably 1 to 10 dtex. Also, the total fineness is preferably from 20 to 150 dtex.

In the antistatic warp knitted fabric of the present invention, the composite yarn has one or more stitches (hereinafter also referred to as "stitch X") formed by overlapping loops of mutually adjacent composite yarns. This point will be described with reference to FIG. FIG. 1 is a knitting structure diagram showing one embodiment of the antistatic warp knitted fabric of the present invention. In the knitting structure diagrams shown in FIGS. 1A and 1B, the adjacent composite yarns (a) and (b) are two stitches (circled parts) that are continuous in the warp direction due to the overlapping of the loops of both composite yarns. forming In the present invention, the method of arranging the stitches X is not particularly limited, and as shown in FIG. As shown in FIG. 2 as an embodiment, the stitch X (for example, the circle mark portion in FIG. 2) is a stitch (hereinafter also referred to as “stitch Y”) other than that (for example, the square mark portion in FIG. 2). It may be formed by

In the composite yarn, when the stitch X is not formed, there is conductivity in the warp direction, that is, the wale direction, but there is no conductivity in the transverse direction, that is, the course direction. becomes higher. On the other hand, in the present invention, each composite yarn (all composite yarns) has one or more stitches X, so that the conductive yarns in the composite yarns can contact each other, and the conductive yarns are electrically connected (energized). Therefore, it has conductivity not only in the vertical direction, but also in the horizontal direction and the bias direction, and the surface resistance value becomes low.

In the antistatic warp knitted fabric of the present invention, the stitches X are preferably included at a rate of 5 per 10 cm (5/10 cm) or more in the warp knitted fabric in the warp knitted fabric, and among them, 10 per 10 cm (10 It is more preferable to be contained at a ratio of 1/10 cm) or more. This makes it possible to ensure higher electrical conductivity.

In addition, the antistatic warp knitted fabric of the present invention has a structure as shown in FIG. 1A, FIG. 1B or FIG. It is preferably contained at a ratio of 1 piece/2 cm) or more. Among them, it is more preferable to contain 2 to 5 pieces per 2 cm in the horizontal direction of the warp knitted fabric (2 to 5 pieces/2 cm).

The antistatic warp knitted fabric of the present invention preferably has a surface friction variation value (MMD) in the horizontal direction within the range of 0.01 to 0.10, especially 0.015 to 0.06. It is more preferable to have Moreover, it is preferable that the variation value (MMD) of the surface friction in the longitudinal direction also satisfies the above range.

This value is a value that indicates the degree of unevenness of the warp knitted fabric, and when the surface friction variation value (MMD) in the horizontal direction is 0.01 to 0.10, the unevenness on the surface of the warp knitted fabric is small. , the warp knitted fabric has a smooth surface and at the same time, the surface resistance value measured by IEC61340-5-1 can be made low.

In addition, since the surface is smooth with little unevenness, the conductive thread is less likely to break even if it gets scratched when worn, making it possible to maintain antistatic properties more reliably. It should be noted that the resistance of the conductive thread to breakage due to scratches or the like during wearing can be evaluated by a snag test, and the snag test evaluation is preferably grade 3 or higher, and more preferably grade 4 or higher. . Furthermore, the warp knitted fabric is excellent in comfort when worn because the surface is smooth with little unevenness.

The surface resistance value measured by IEC61340-5-1 is that the conductive yarn is exposed on the surface of the knitted fabric to be measured, and the larger the convex portion is formed, the larger the current flowing between the electrodes, and the higher the surface resistance value. tends to be lower. That is, the smoother the surface of the knitted fabric, the smaller the current flowing between the electrodes and the higher the surface resistance. Therefore, if the surface friction variation value (MMD) is less than 0.01, the surface resistance values in the vertical, horizontal and bias directions tend to be high.

The antistatic warp knitted fabric of the present invention has a surface friction variation value (MMD) in the horizontal direction that satisfies 0.01 to 0.10, so that the surface resistance value is low and the durability against scratches during wearing is improved. It has excellent comfort when worn.

In the present invention, the surface friction variation value (MMD) of the warp knitted fabric is measured as follows. That is, using a KES surface property tester (manufactured by Kato Tech Co., Ltd., "KESFB2-A"), a warp knitted fabric as a sample was loaded with a load MIU of 50 gf, a contact pressure of 10 gf, a sample tension of 20 gf/cm, and a speed of 1 mm/ It can be measured under the condition of sec.

In order to make the surface friction variation value (MMD) of the antistatic warp knitted fabric of the present invention 0.01 to 0.10, it is preferable to reduce the unevenness of the knitted fabric. More specifically, the antistatic warp knitted fabric of the present invention is knitted with a composite yarn composed of a conductive yarn and a first non-conductive yarn, and a second non-conductive yarn. The total fineness of the stitch where the total fineness of the yarns in each stitch is the largest (maximum total fineness: A), and the total fineness of the stitch where the total fineness of the yarns knitted into each stitch is the smallest ( The difference (AB) from the minimum total total fineness: B) is usually preferably 200 dtex or less, more preferably 150 dtex or less, and further preferably 100 dtex or less. is most preferred. The lower limit of (AB) above can be set to 5 dtex, for example, but is not limited to this.

In particular, in the antistatic warp knitted fabric of the present invention, the maximum total total fineness is often the total total fineness of the yarns knitted into the stitches X. Therefore, the total total fineness of the yarns knitted into the stitches X The difference (AB) between the maximum total fineness (A) of the total fineness and the minimum total fineness (B) of the total fineness of the yarns knitted in the other stitches (stitch Y) is preferably 200 dtex or less. The lower limit of (AB) can be, for example, 5 dtex, but is not limited to this.

Regarding the maximum total fineness (A) and the minimum total fineness (B), for example, when each stitch X has a different total fineness, the total fineness of the stitch Xmax where the total fineness is the maximum is referred to as A above. Similarly, when the stitches Y have different total finenesses, B is the total fineness of the stitch Ymin with the smallest total fineness.

Regarding this, taking Example 1 below as an example, the stitch (stitch X) composed of L1, L2 (A), and L3 (A) is the thickest, and the maximum total fineness is 188 dtex. On the other hand, the stitch (stitch Y) composed of L1, L2(B), and L3(B) is the thinnest, and the minimum total fineness is 168 dtex. Therefore, the value of (AB) above is 188-168=20 dtex.

The antistatic warp knitted fabric of the present invention has excellent initial antistatic properties and excellent antistatic properties after 10 washes, especially after 100 washes. It is preferable that the antistatic property is also excellent. Specifically, after 10 washes, the surface resistance values in the vertical, horizontal and bias directions measured by IEC61340-5-1 are 1.0×10 ¹⁰ Ω or less, especially 1.0×10 ⁹ Ω. It is preferably Ω or less, and more preferably 1.0×10 ⁸ Ω or less.

The initial surface resistance values in the vertical, horizontal and bias directions measured by IEC61340-5-1 are preferably 1.0×10 ¹⁰ Ω or less, especially 1.0×10 ⁹ Ω or less. more preferably, and most preferably 1.0×10 ⁸ Ω or less.

Furthermore, the surface resistance values in the vertical, horizontal and bias directions measured by IEC61340-5-1 after 100 washes are preferably 1.0×10 ¹¹ Ω or less, especially 1.0×10 It is more preferably ¹⁰ Ω or less, and most preferably 1.0×10 ⁹ Ω or less.

The lower the surface resistance value measured by IEC61340-5-1, the better the antistatic properties of the knitted fabric. Although the lower limit of is not particularly limited, it is preferably about 1.0×10 ⁴ Ω.

In addition to the vertical direction, the horizontal direction, and the bias direction, the surface resistance value between the stitches when the warp knitted fabric is sewn satisfies the above range at the initial stage, after 10 washes, and after 100 washes. preferable.

In the present invention, the surface resistance value is measured according to IEC61340-5-1. More specifically, as a measuring device, "PORSTAT Resistance System PRS-801" is used, and the measurement environment is 23 ° C. x 12% RH. , the surface resistance value is measured under the condition that the distance between measurements is 250 mm. Also, the washing conditions comply with the Japanese Industrial Standard JIS L 0217 103 method.

The antistatic warp knitted fabric of the present invention has antistatic properties as described above, and the content of the conductive yarn in the warp knitted fabric is generally preferably 0.5 to 10% by mass. In particular, it is more preferably 1 to 8% by mass. If the content of the conductive yarn is less than 0.5% by mass, it is difficult to obtain the desired antistatic property of the present invention. On the other hand, if it exceeds 10% by mass, the strength or texture of the warp knitted fabric tends to be impaired, and the cost may be relatively high.

After knitting, the conductive warp knitted fabric of the present invention may be subjected to various treatments such as dyeing, water absorption, and electrification.

The antistatic warp knitted fabric of the present invention can be suitably used for clothing, but the type of clothing is not particularly limited. Including mufflers, hats, etc.

And the antistatic warp knitted fabric of the present invention can be used as work clothes used in various businesses including the electronics industry. It can be used for work clothes used for handling applications and general electric work applications. Work clothes such as those described above can be obtained by using the antistatic warp knitted fabric of the present invention at least in part, and using ordinary knitting techniques, sewing techniques, and the like.

Examples and comparative examples are shown below to more specifically explain the features of the present invention. However, the scope of the present invention is not limited to the examples. Various values in the examples were measured as follows.

[Snag]
According to the Japanese Industrial Standard JIS L 1058 2011 D-3 method, four test pieces were taken from the obtained warp knitted fabric, the test results of the four pieces were determined, and the average value was calculated. Grade 3 or above was considered a pass.
[Variation value of surface friction]
It was measured by the method described above. In addition, the variation value (MMD) in the vertical direction and the horizontal direction was measured.
[Surface resistance value]
The surface resistance values in the warp knitted fabric, the warp knitted fabric obtained at the initial stage, the warp knitted fabric after 10 washes and the warp knitted fabric after 100 washes were measured in the warp, weft and bias directions according to IEC61340-5-1. Washing was performed according to the JIS L 0217 103 method. At this time, three types of samples were prepared by cutting the obtained warp knitted fabric into rectangular samples having a long side direction of 35 cm and a short side direction of 30 cm under the following conditions (a) to (c).
(a) The long side direction is the vertical direction and the short side direction is the horizontal direction (b) The long side direction is the horizontal direction and the short side direction is the vertical direction (c) The long side direction is the bias direction and the short side direction is the bias direction (a), (b), and (c) are placed in this order, and two places, (a) and (b) facing each other in the long side direction and (b) and (c) facing each other in the long side direction, are laid down to one side. A sample (d) was obtained by sewing with a double stitch.
The surface resistance value in the vertical direction was measured using the sample (a) with a distance between measurements of 25 cm in the long side direction.
The surface resistance value in the horizontal direction was measured using the sample (b) with a distance between measurements of 25 cm in the long side direction.
The surface resistance value in the bias direction was measured using the sample (c) with a distance between measurements of 25 cm in the long side direction.
The surface resistance value between seams is measured using the sample of (d), including two seams sewn with one-sided double stitches, and a distance between measurements of 60 cm in length in the short side direction. gone.

Example 1
(Thread use)
L1 reed: Polyester multifilament (56dtex/36f) made of polyethylene terephthalate (second non-conductive yarn)
L2 reed: (A): Composite yarn composed of first non-conductive yarn and conductive yarn shown below (twisted yarn with a twist number (Z twist) of 400 T / m)
First non-conductive thread: Polyester multifilament made of polyethylene terephthalate (33dtex/12f)
Conductive thread: "Beltron" manufactured by KB Seiren (33dtex/6f, the conductive polymer of the sheath accounts for 100% of the outer circumference)
(B): Polyester multifilament made of polyethylene terephthalate (56dtex/36f) (second non-conductive yarn)
(A) was arranged in 6 courses, and (B) was arranged for the rest to form a full set.
L3 reed: (A) uses the same composite yarn as L2 reed (A), (B) uses the same polyester multifilament (second non-conductive yarn) as L2 reed (B), and has the same arrangement as L2 reed. did.
(knitted structure)
A back yarn is arranged on the L1 reed, a middle yarn is arranged on the L2 reed, and a front yarn is arranged on the L3 reed. Using these yarns, a structure (L2 The warp knitted fabric was knitted with a reed (only L3 reed is shown).
The resulting warp knitted fabric was subjected to relaxation scouring at 90° C. for 30 minutes using a circular dyeing tester and a surfactant (Sunmor FL, manufactured by Nicca Chemical Co., Ltd.) at a concentration of 1 g/L.
Then, using the same circular dyeing tester as above, the fabric was subjected to water absorption and dyeing processing at 130° C. for 30 minutes, followed by finishing setting to obtain an antistatic warp knitted fabric.

Example 2
The arrangement of the L2 and L3 reeds was such that (A) was arranged one in 14 courses, and the other (B) yarns were arranged and set as a full set, and the organization shown in FIG. 1B (only L2 reeds and L3 reeds are shown). A warp knitted fabric was knitted in the same manner as in Example 1, except for the above. The obtained warp knitted fabric was subjected to water absorption, dyeing processing and finishing setting in the same manner as in Example 1 to obtain an antistatic warp knitted fabric.

Example 3
A warp knitted fabric was knitted in the same manner as in Example 2, except that the L2 and L3 reeds were arranged in 14 courses in (A) and (B) the yarn was not arranged. The obtained warp knitted fabric was subjected to water absorption, dyeing processing and finishing setting in the same manner as in Example 1 to obtain an antistatic warp knitted fabric.

Example 4
(Thread use)
L2 reed, L3 reed: (A): The same composite yarn (plied twisted yarn) as in Example 1
(B): Same polyester multifilament (56dtex/36f) as in Example 1 (second non-conductive yarn)
(A) was arranged in 6 courses, and (B) was arranged in the rest to form a full set.
(knitted structure)
A middle yarn is arranged on the L2 reed and a front yarn is arranged on the L3 reed, and using these yarns, a warp knitted fabric is knitted with the structure shown in FIG. . The obtained warp knitted fabric was subjected to water absorption, dyeing processing and finishing setting in the same manner as in Example 1 to obtain an antistatic warp knitted fabric.
The obtained warp knitted fabric contained 50 stitches X per 10 cm in the vertical direction (50 stitches/10 cm).

Comparative example 1
L1 reed: Polyester multifilament (84dtex/36f) made of polyethylene terephthalate (second non-conductive yarn)
L2 reed: (A): Composite yarn (twisting number (Z twist) of 400 T / m) composed of the first non-conductive yarn and conductive yarn shown below
First non-conductive thread: Polyester multifilament made of polyethylene terephthalate (84dtex/36f)
Conductive thread: "Beltron" manufactured by KB Seiren (33dtex/6f, the conductive polymer of the sheath accounts for 100% of the outer circumference)
(B): Yarns were not arranged.
L3 reed: (A) uses the same yarn as the L2 reed (A), and (B) does not arrange the yarn and has the same arrangement as the L2 reed.
Other than that, the warp knitted fabric was knitted in the same manner as in Example 1. The obtained warp knitted fabric was subjected to water absorption, dyeing processing and finishing setting in the same manner as in Example 1 to obtain an antistatic warp knitted fabric.

Comparative example 2
A warp knitted fabric was knitted in the same manner as in Example 3, except that (A) of the reeds L2 and L3 used only the conductive yarn and did not use the composite yarn with the first non-conductive yarn. The obtained warp knitted fabric was subjected to water absorption, dyeing processing and finishing setting in the same manner as in Example 1 to obtain an antistatic warp knitted fabric.

Comparative example 3
As shown in FIG. 3, a warp knitted fabric was knitted in the same manner as in Example 3, except that in L2 and L3, each composite yarn was changed to a structure having no stitches X. The obtained warp knitted fabric was subjected to water absorption, dyeing processing and finishing setting in the same manner as in Example 1 to obtain an antistatic warp knitted fabric.

Test example 1
Table 1 shows the characteristic values of the antistatic warp knitted fabrics obtained in Examples 1 to 4 and Comparative Examples 1 to 3.

As is clear from Table 1, the warp knitted fabrics obtained in Examples 1 to 4 satisfy all the requirements (1) to (4) specified in the present invention, and IEC61340-5-1 The surface resistance value was low, and the washing durability of the surface resistance value was also excellent. In addition, since the texture of the surface was small and the snag evaluation was high, it can be seen that the antistatic property can be maintained at a high level.

On the other hand, the warp knitted fabric obtained in Comparative Example 1 had large unevenness on the surface and did not satisfy the requirements of (3), so the snag evaluation was low. In other words, there is a high risk that the conductive yarn will break, and there is concern that repeated wear will reduce the antistatic properties. In addition, it can be seen that the warp knitted fabric can be inferior in wearing feeling due to large irregularities on the surface.

Since the warp knitted fabric obtained in Comparative Example 2 uses a single conductive yarn (not a composite yarn consisting of a conductive yarn and a non-conductive yarn), the antistatic property is reduced after repeated washing. , (4) were not satisfied. Also, the conductive yarn was broken during warping and knitting, resulting in poor workability.

In the warp knitted fabric obtained in Comparative Example 3, the composite yarns did not have stitches X and did not satisfy the requirements of (2). value) was high and did not satisfy the requirement (4).

Claims

A warp knitted fabric knitted with (a) a composite yarn containing a conductive yarn and a first non-conductive yarn and (b) a second non-conductive yarn, the requirements of (1) to (4) below:
(1) The composite yarn is included in the yarn that knits at least one of the surface and the back surface of the warp knitted fabric,
(2) the composite yarn has one or more stitches formed by overlapping loops of mutually adjacent composite yarns;
(3) The surface friction variation value (MMD) in the horizontal direction of the warp knitted fabric is 0.01 to 0.10, and (4) The vertical direction and horizontal direction measured by IEC61340-5-1 after 10 washes An antistatic warp knitted fabric characterized by satisfying surface resistance values of 1.0×10 10 Ω or less in both the direction and the bias direction.
2. The antistatic warp knitted fabric according to claim 1, wherein the composite yarn is at least one selected from the group consisting of (i) plied yarn, (ii) covering yarn and (iii) interlaced yarn.
The antistatic warp knitted fabric according to claim 1, wherein the content of the conductive yarn in the total mass of the warp knitted fabric is 0.5 to 10.0% by mass.
The antistatic fabric according to claim 1, wherein the surface resistance values in the vertical direction, the horizontal direction, and the bias direction measured by IEC61340-5-1 after washing 100 times are all 1.0 × 10 11 Ω or less. Knitted fabric.
The maximum total fineness (A) of the yarns knitted into the stitches formed by overlapping the loops of the composite yarns, and the total total fineness of the yarns knitted into the other stitches. 2. The antistatic warp knitted fabric according to claim 1, wherein the difference (AB) from the smallest total total fineness (B) is 200 dtex or less.
2. The antistatic warp knitted fabric according to claim 1, wherein the stitches formed by overlapping the loops of the composite yarns are included at a rate of 1 or more per 2 cm in the horizontal direction of the warp knitted fabric.
The antistatic warp knitted fabric according to any one of claims 1 to 6, which is used for clothing.
Work clothes comprising the antistatic warp knitted fabric according to any one of claims 1 to 6.