JPS6328936A - Antistatic fabric - Google Patents

Abstract

(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to antistatic fabrics. More specifically, the present invention relates to an antistatic fabric in which conductive threads are not exposed on at least one side of the fabric.

[Prior art]

Conventionally, conductive threads have been woven into uniforms worn by workers working in workplaces where static electricity is averse, such as IC factories. A conductive monofilament yarn or a conductive multifilament yarn) whose outside is covered with a thermoplastic multifilament yarn such as polyamide or polyester is used.

By the way, conductive fibers are known to have a wide variety of shapes, such as core-sheath type and bimetallic type, but all of them contain conductive components such as black carbon and brown metal, so they are not conductive. The appearance of the electroconductive fiber itself is black or brownish like the conductive component.

Therefore, when a conductive yarn in which conductive fibers are partially exposed due to incomplete shearing is woven into a fabric, there is a problem in that the exposed conductive fibers are very conspicuous.

[Purpose of the invention]

An object of the present invention is to provide an antistatic fabric in which the defective portion of the covering is not conspicuous even if a conductive yarn having a partial warping defect is woven into the fabric.

[Structure of the invention]

That is, the antistatic textile of the present invention is a textile in which conductive threads are part of the constituent threads, and the exposure ratio of the conductive threads exposed on at least one surface of the textile is higher than that of the entire textile. The weight ratio of the conductive yarn is smaller than that of the conductive yarn used in the invention.

In a woven fabric constructed in this way, most of the conductive yarns are exposed on the back side of the woven fabric, so even if conductive yarns with defects in part of the webbing and barring are woven into the woven fabric,
The defect becomes less noticeable.

The above exposure ratio E is the number of interwoven structures in which the conductive yarn intersects with front warp threads (front weft threads) within one complete structure, and A is the total number of interweavings between front warp threads and front weft threads within one complete structure. The number of tissue intersections is B
When, E=A/B... (1) It is expressed as follows.

In addition, the weight ratio W used is as follows: W=M/N (2) where M is the amount of conductive yarn used in the same area and N is the total amount of yarn used in the same area. expressed.

On the other hand, conductive yarn refers to a multilayered yarn in which the outside of a yarn having a conductive component is covered with a multifilament yarn so that the yarn having a conductive component is not exposed to the outside.

Further, the yarn having a conductive component refers to known conductive fibers (conductive monofilament yarn and conductive multifilament yarn) such as core-sheath type or bimetal type containing a conductive component such as carbon or metal.

The conductive yarn is preferably a conductive composite thread in which the outside of a yarn containing a conductive component such as carbon or metal is wound with a crimped yarn made of unoriented thermoplastic multifilament. . This conductive composite processed yarn is produced by aligning at least a yarn having a conductive component and a thermoplastic multifilament undrawn yarn or semi-drawn yarn, and then subjecting the yarn to false twisting.

More specifically, the conductive composite processed yarn is produced by combining three yarns: a conductive fiber, a thermoplastic multifilament undrawn yarn or semi-drawn yarn, and a thermoplastic multifilament drawn yarn. , by performing an air entanglement treatment using an air jet nozzle for entangling, and then performing a false twisting process in a false twisting area.

The temperature of the false-twisting heater in the false-twisting processing area is 170℃ to 200℃.
A range of 0.degree. C. is preferred. If the temperature exceeds 200°C, the single fibers constituting the undrawn yarn or semi-drawn yarn will fuse together, making uniform winding difficult.

In this case, since the electrically conductive yarn that will eventually become the core yarn and the thermoplastic multifilament yarn that will ultimately become the sheath yarn are drawn and false-twisted at the same time, it is difficult to obtain a large stretching ratio and the final step (
In the composite textured yarn), the thermoplastic multifilament yarn forming the sheath is hardly oriented. For example, in the case of polyester fiber, its birefringence is 80 to 140XIO
-' is within the range.

Further, if desired, in addition to the conductive fiber that will eventually become the core and the thermoplastic multifilament yarn that will eventually become the sheath, a third component yarn such as a drawn yarn may be combined.

When the threads of the third component are combined, the black or brown conductive fibers are also covered by the threads of the third component, making them even more difficult to see.

Furthermore, if the aligned yarns are air-entangled before being false-twisted, the yarns other than the conductive fibers will come apart, so that the covering properties will be improved.

Furthermore, if a matte thread is used as the thread that will eventually become the sheath, the conductive fibers will be difficult to see.

Moreover, the birefringence of the thermoplastic multifilament undrawn yarn or semi-drawn yarn is preferably in the range of 22 to 39×10 −3 . Below 8X10-3, it is completely amorphous, so 2
When placed on a false twisting heater at 00°C, it will instantly fuse, and on the other hand, if it exceeds 60 x 10', it will show physical behavior similar to ordinary drawn yarn, and its covering properties will deteriorate.

Further, although the conductive fibers may be used alone, two or more conductive fibers may be used in alignment.

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is an enlarged sectional view showing one embodiment of the antistatic fabric according to the present invention, and the antistatic fabric T has a double-woven structure consisting of a front fabric 1 and a back fabric 1). However, the front cloth 1 has many warp threads 3 and weft threads 2a.

It is composed of 2bl 2CI... In addition, the back cloth 1) has many warp threads 13 and weft threads 12a, 1
It is composed of 2b, 12c, . . . . The front cloth 1 and the back cloth 1) are connected by conductive threads 20 as binding yarns (warps).

That is, the conductive threads 20 are arranged between the warp 3 and the weft 2a of the front cloth 1, between the warp 13 and the weft 12d of the back cloth 1), between the warp 3 and the weft 2e of the front cloth 1, and between the warp 3 and the weft 2e of the back cloth 1. ) between warp 13 and weft 12h, between warp 3 and weft 21 of front cloth 1, etc.
・ are arranged in a staggered manner through , and do not appear on the surface of cloth 1.1) at all.

In this example, the exposure ratio of the conductive thread 20 is 0%, and the weight ratio of the conductive thread 20 used in the fabric T varies depending on the arrangement ratio of the threads, but of course it is thicker than 0%. The exposed ratio of the conductive yarn 20 is smaller than the weight ratio of the conductive yarn 20 used in the fabric T.

FIG. 2 is an enlarged sectional view showing one embodiment of the antistatic fabric according to the present invention, and is an antistatic fabric T.

is composed of cloth 1' and conductive thread 20'.

Cloth 1' has many warp threads 3° and weft threads 2a+ and 2b+.

The conductive yarn 20' is woven between the warp yarn 31 and the weft yarn 2h1, and then arranged along the back surface of the cloth 1''. Yarn 20' is cloth 1
The pitch woven into the back side of ' can be designed in various ways.

The weave structure of this antistatic fabric T'' is 2/2 twill on the front side and 3/2 twill on the back side.
It is made of 8-ply satin, and the conductive yarn 209 does not appear on the front side at all.

〔Effect of the invention〕

As described above, the present invention provides a fabric in which a conductive yarn is a part of the constituent yarns, wherein the exposure ratio of the conductive yarn exposed on at least one surface of the fabric is equal to or less than that of the fabric as a whole. Since the weight ratio of the conductive yarn used is smaller than the weight ratio of the conductive yarn used, even if a conductive yarn with a partially defective covering is woven into the fabric, an antistatic fabric is obtained in which the defective part of the covering is not noticeable. It will be done.

〔Example〕

Example Polyester 150/2-48 (ground part) and conductive threads 220 denier (stripe thread) were arranged in a ratio of 27=1 in the warp, and 67 pieces/i of polyester/cotton 45/2 were arranged in the weft.
n x 54 pieces/i n'''?: When the woven structure was woven with a plain weave for the base and a 1/3 deformed mat for the threads, an antistatic fabric with no carbon black visible from the surface of the fabric was obtained.

Here, a core-sheath type conductive fiber (20 denier (D)/3
filament (F)) and polyester drawn yarn (75D
/36F) and highly oriented polyester undrawn yarn (75D/
Three yarns of 36F) were aligned, air-entangled, and then subjected to a false twisting process to obtain a conductive fiber of 220D in total. In this conductive fiber, the above-mentioned conductive fiber threads and drawn polyester threads mainly exist in the core, and around the core, polyester threads that are not oriented (highly oriented undrawn threads) are alternately arranged in S and Z directions. It was a thread that was wound inverted.

Note that the processing conditions for the yarn are as follows.

(1) Air pressure of air injection nozzle = 3 kg/m2 (2) Stretching ratio in stretched false twisting area: 1.04 (3) Processing speed: 40
0 m/min (4) False twisting heater temperature = 170°C The exposure ratio of the U-plate conductive yarn is 1.8%, and the weight ratio of the conductive yarn used in the fabric is 2°7%. The exposed ratio of the conductive yarn was smaller than the weight ratio of the conductive yarn used in the fabric.

[Brief explanation of the drawing]

FIG. 1 is an enlarged cross-sectional view showing one embodiment of the antistatic fabric according to the present invention, and FIG. 2 is an enlarged cross-sectional view showing one embodiment of the antistatic fabric according to the present invention. 20.20"...Conductive yarn, T, T"...Antistatic fabric.

Claims (3)

[Claims] (1) A woven fabric in which conductive yarn is part of the constituent yarns,
An antistatic fabric characterized in that an exposure ratio of the conductive threads exposed on at least one surface of the fabric is smaller than a weight ratio of the conductive threads used throughout the fabric. (2) The conductive thread covers the outside of the thread having a conductive component.
The antistatic fabric according to claim (1), which is a conductive composite processed yarn wound with a crimped yarn made of unoriented thermoplastic multifilament. (3) The antistatic fabric according to claim (2), wherein the conductive component is carbon or metal.