JP2000110042A - Antistatic machine sewing thread - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain an antistatic machine-sewing thread having antistatic function by using a polyester filament as a main constituent fiber, mixing the main fiber with a conductive fiber, subjecting to primary twisting treatment and doubling and twisting the plural yarns produced by the above process in a direction reverse to the primary twist. SOLUTION: An antistatic machine-sewing thread is produced by using a polyester filament having a strength of >=5 g/d and a boiling water shrinkage of <=3% as main constituent fiber, blending the filament with a conductive fiber having an electrical resistance of <=1.0×108 Ω/cm, subjecting the blended fiber to primary twisting treatment and doubling and twisting plural yarns obtained by the above process in a twisting direction reverse to the primary twist.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a sewing thread having antistatic properties.

[0002]

2. Description of the Related Art Conventionally, various types of long yarns and plied yarns of spun yarns have been provided as sewing threads, and are used for clothing and industrial purposes depending on the material and use of sewing products. There has been a demand for high-value-added sewing threads with added functionality in such sewing threads, and those having high strength properties, excellent heat resistance, and those having flame retardancy have been proposed. ing. Further, one of the required characteristics is a sewing thread having an antistatic function, but at present there is no proposal on this. In particular, polyester filament yarn is also widely used because it has a high modulus, is excellent in dimensional stability, and has excellent properties such as little change in physical properties over time. Although a proposal has been made, there is no proposal for a sewing thread having an antistatic function at present.

[0003] The present invention has been made in view of such circumstances, and is intended to provide a sewing thread having a function of preventing static charge, which is a sewing thread formed by twisting various kinds of long fibers or spun yarns. The task is to provide.

[0004]

SUMMARY OF THE INVENTION The present invention is to solve the above-mentioned problem, and is a sewing thread in which a plurality of ply-twisted yarns are twisted in a direction opposite to the ply-twist. The present invention also provides an antistatic sewing thread characterized in that conductive fibers having an electric resistance value of 1.0 × 10 ⁸ Ω / cm or less are mixed.

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in detail.
The antistatic sewing thread of the present invention is a yarn in which a plurality of ply-twisted yarns are ply-twisted in a direction opposite to the ply-twist, and mixed with conductive fibers. The main fiber constituting the antistatic sewing thread of the present invention may be any fiber that can be used as a sewing thread, cotton, hemp, wool, natural fiber such as silk, regenerated fiber such as rayon, Cellulose-based solvent-spun fibers spun by dissolving cellulose in a solvent, nylon,
Examples include synthetic fibers such as polyester, vinylon, and acrylic, and high-performance fibers such as aramid, wholly aromatic polyester, and high-strength polyethylene. These fibers may be long fiber yarns or spun yarns. Further, the long fiber yarn may be a non-crimped yarn or a yarn that has been subjected to processing such as crimping such as false twisting.

[0006] In the present invention, the ply-twisting of the plurality of twisted yarns is performed to improve the sewability by minimizing frictional resistance during sewing by imparting a roundness to the entire yarns. Yes,
Two or more twisted yarns are twisted, and usually, three twisted yarns are preferably twisted. The reason why the twisting is performed in the opposite direction to the priming is to suppress the twisting torque of the twisted yarn and obtain a uniform seam.

In the antistatic sewing thread of the present invention, a conductive fiber having an electric resistance of 1.0 × 10 ⁸ Ω / cm or less is mixed. The conductive fiber having an electric resistance value of 1.0 × 10 ⁸ Ω / cm or less is made by kneading a conductive material such as carbon powder or metal powder into a synthetic resin and thread-forming. It may be one produced by itself or one produced by composite spinning with another synthetic resin. The electric resistance value of the conductive fiber is 1.0 × 10 ⁸ Ω / cm or less. Such a performance can be achieved by using a resin obtained by melting and mixing 30 parts of conductive carbon black particles and 70 parts of a synthetic resin, or using an oxidized resin. It can be obtained by spinning using a resin obtained by melting and mixing 60 parts of titanium oxide particles coated with stannic tin and 40 parts of a synthetic resin.

If the electric resistance value of the conductive fiber used in the sewing thread of the present invention exceeds 1.0 × 10 ⁸ Ω / cm, a sufficient antistatic effect cannot be obtained. Further, the ratio of the conductive fibers to be mixed in the sewing thread of the present invention,
About 1% by weight or more is sufficient. Of course, the larger the proportion of the conductive fibers, the more stable the antistatic effect can be obtained. It is preferable to increase the usage ratio to an extent that does not occur.

The mixed form of the conductive fibers in the antistatic sewing thread of the present invention includes a method in which the main constituent fibers and the conductive fibers are preliminarily mixed by an air turbulence method or the like before priming.
There are a method of twisting with the main constituent fiber at the time of twisting, a method of twisting by feeding together with the twisted yarn at the time of twisting, and the like. In general, conductive fibers are conspicuous when mixed with ordinary fibers, so it is better to keep them out of the outside as much as possible. To do this,
It is desirable that the fibers are mixed with the constituent fibers before priming. Also, as a method of making the conductive fibers less noticeable when twisted by being supplied together with the three ply-twisted yarns at the time of plying, the tension supplied to the plying machine is adjusted to make the conductive fibers three ply-twisted yarns. There is a way to position it in the middle of the strip.

In the present invention, when the main constituent fiber is polyester filament yarn, the boiling water shrinkage is 3% or less, and the strength is 5 g / denier or more, the seam strength of sewing of sports clothing and industrial materials is large. It is suitable when it is required that the quality of the fabric surface can be prevented from deteriorating due to the occurrence of puckering at the stitched portion even by repeated washing and the like, and a more preferable antistatic sewing thread is provided. Can be.

[0011]

The present invention will be described below in detail with reference to examples. The performance evaluation in the examples was performed by the following method. (1) Electric resistance value The electric resistance value was measured at a voltage of 500 V using an ultramega ohm meter (type SM-10E) manufactured by Toa Denpa Kogyo KK. (2) Boiling water shrinkage rate Measured according to JIS L-1013. (3) Strength Strength (g) is measured according to JIS L-1013 and expressed by a value obtained by dividing by fineness (denier).

Example 1 A conductive fiber MEGA III 25 using carbon black as a conductive substance and having an electric resistance of 3 × 10 ⁷ Ω / cm and a strength of 2.5 g / d.
d / 2f (manufactured by Unitika Ltd.) and a polyester filament yarn 75d / 24f with a strength of 7.2g / d are aligned and a single twisted thread of S800T / M is applied to the polyester with a strength of 7.2g / d. Twisted with two twisted S800T / M twisted yarns using only the filament yarn 100d / 24f with a twisting machine, followed by setting the twist at 90 ° C for 30 minutes and dyeing. Sewing machine thread count 40
No. 1 of the antistatic sewing thread of the present invention was obtained.

Example 2 Example 1 was repeated except that the polyester filament yarn 100d / 24f having a strength of 4.7 g / d was used instead of the polyester filament yarn 100d / 24f having a strength of 7.2 g / d. In the same manner as in the above, an antistatic sewing thread of the present invention was obtained.

Comparative Example 1 In Example 1, the strength was 7.2 g / d without using conductive fibers.
S800T / M only with 100d / 24f polyester filament yarn
A sewing thread of a comparative example was obtained using three yarns subjected to priming. Table 1 shows the evaluation results of the characteristics of the sewing threads of Examples 1 and 2 and Comparative Example 1.

[0015]

[Table 1]

As is clear from Table 1, the sewing thread of the present invention has a small electric resistance and an antistatic effect. The sewing thread of Example 1 using a high-strength polyester filament yarn has higher strength as a sewing thread than Example 2 using a normal high-strength polyester filament thread, and is more suitable for antistatic properties for industrial use. It was a sewing thread. On the other hand, Comparative Example 1 in which the conductive fiber is not used does not have the effect of preventing static charge.

[0017]

Industrial Applicability The present invention relates to a sewing thread having an antistatic function, which can be used in a wide range of clothing and industrial applications, reduces troubles caused by static electricity at the time of sewing, and is particularly suitable for dustproof clothing. By using for sewing such antistatic clothing, the antistatic performance can be further improved, and also in general clothing, it contributes to prevention of clinging of clothing and crackling during undressing.

Claims (2)

[Claims] 1. A sewing thread in which a plurality of ply-twisted yarns are twisted in a direction opposite to the ply-twist, and have an electric resistance value of 1.0.
An antistatic sewing thread characterized by being mixed with a conductive fiber of × 10 ⁸ Ω / cm or less. 2. The antistatic sewing thread according to claim 1, wherein the main fiber constituting the sewing thread is a polyester filament thread, the boiling water shrinkage is 3% or less, and the strength is 5 g / denier or more.