Textiles: spinning – twisting – and twining – Strand structure – Covered or wrapped
Reexamination Certificate
2002-06-04
2003-09-09
Ruddock, Ula C. (Department: 1771)
Textiles: spinning, twisting, and twining
Strand structure
Covered or wrapped
C057S230000, C057S235000, C057S243000, C057S244000, C428S373000, C442S189000, C442S190000, C442S191000, C442S199000, C442S200000, C442S203000, C442S208000, C442S209000, C442S217000, C442S301000, C002S901000
Reexamination Certificate
active
06615572
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to fabrics excellent in conductivity and antistatic property as well as dust proof clothes sewed therefrom, which are electroconductive throughout the dust proof clothes and excellent in durability and antistatic property.
BACKGROUND OF THE INVENTION
Conventionally, yarn composed of electroconductive (hereinafter referred to “conductive”) fibers and non-conductive synthetic fibers is woven into fabrics for dust proof clothes for a measure against static electricity. Fabrics into which yarn containing these conductive fibers has been woven are conductive in the warp and weft directions along which the conductive fibers have been woven, not only in the case where yarn containing conductive fibers is mixed and woven in a striped pattern at predetermined intervals, but also in the case where the yarn is woven in a check-striped pattern, but satisfactory conductance cannot be obtained in a slanting direction of fabric, and therefore, it is difficult to achieve electrical conductance throughout dust proof fabrics. The reason for this is that conductive fiber introduced into the warp and conductive fiber introduced into the weft are in poor electrical contact with each other.
Further, in dust proof clothes formed from these fabrics, it is difficult to achieve electrical conductance in the sewn portions, and it is further difficult to achieve electrical conductance throughout the dust proof clothes.
The reason is that the conductive yarns in the respective fabrics are not in electrical contact with each other even in the sewn portios.
If conductive yarn composed exclusively of conductive fibers is woven in the case where conductive yarn is woven into fabrics, differences in fiber characteristics such as strength, elongation, shrinkage etc. occur between the conductive fibers and other fibers constituting the fabrics, thus readily causing various drawbacks such as fiber cutting, puckering etc. at the time of weaving and processing. Further, because the conductive fibers are more expensive than general fiber materials, it is also important to reduce the amount thereof for use.
Accordingly, conductive fibers are mixed with fibers similar to fibers used in the base constituting fabrics by means of inter-twisting, air confounding etc., and the yarns thus obtained are generally used.
In the case where these conductive yarns are mixed in a striped pattern at predetermined intervals in weaving of fabric, the resulting fabric is conductive in the direction along which the conductive fibers have been woven, but cannot be conductive in other directions.
Further, even in the case where these conductive yarns are woven in a check-striped pattern at predetermined intervals, there is electrical conductance in the directions such as warp and weft directions along which the conductive yarns have been woven, but the conductive yarns woven into the warp and the conductive yarns woven into the weft are not in electrical contact with each other, so it is difficult to achieve satisfactory electrical conductance in a slanting direction of the fabric, and as a result, it is difficult to achieve satisfactory electrical conductance throughout the fabric.
This is caused by the fact that the conductive fibers are buried inside of the yarn so that the contact between the conductive fibers inserted into the yarn as the warp and the conductive fibers inserted into the yarn as the weft is deteriorated.
Further, the conductive fibers are buried inside of the yarn, thus deteriorating antistatic property and simultaneously raising the contact resistance between the conductive fibers and the outside, so the sewn portions in contact under low contact pressure in sewing the fabric are hardly rendered conductive.
As described above, the conventional dust proof clothes suffer from the two problems, that is, fabrics used in each portion of the dust proof clothes cannot achieve good electrical conductance throughout the fabrics, and upon sewing of the respective portions, electrical conductance in the sewn portions cannot be stably obtained, so it is difficult to achieve electrical conductance throughout the dust proof clothes.
As a method of improving antistatic property, JP60-28546A describes a method of improving the performance of dissipating static electricity by raising conductive fibers to the surface of fabric to form a parallel and check-striped pattern. In this prior art method, however, the mutual contact between the conductive fibers formed in the warp and those in the weft are not sufficient, and the electrical conductance of the resulting fabric in a slanting direction is hardly obtained. Further, the conductive fibers are raised to the surface of the fabric, and the conductive fibers have a larger diameter than that of non-conductive fibers in the base constituting the fabric, so there is a problem with abrasion durability.
JP-A 55-135014 describes that for improvement of the electrical conductance of sewn portions in dust proof clothes, the portions to be sewn are sewed such that yarn containing conductive fibers as a part of sewing threads is brought into electrical contact with the end of conductive fibers mixed in fabric.
In this case, however, electrical contact in the sewn portion is sometimes deteriorated when drawbacks such as puckering are appeared in the sewn portion due to repeated wearings and washings.
JP-A 58-160209 describes clothes in which a conductive material is arranged at overlap portions or butted portions of fabric having conductive fibers woven at suitable intervals, so that the respective portions are an electrical contact with one another. In this case, however, there is an economical problem because the conductive material should be arranged at the cloth overlap portions or the butted portions, and there is a further problem with the durability of the conductive material itself to be arranged.
OBJECT OF THE INVENTION
The object of the present invention is to provide fabrics excellent in conductivity and antistatic property as well as dust proof clothes being electrically conductive throughout the dust proof clothes and further excellent in durability and antistatic property, to solve the problems described above.
SUMMARY OF THE INVENTION
First, the present invention resides in fabrics comprising warps and/or wefts containing electrically conductive yarn at intervals, characterized in that the electrically conductive yarn is structured by covering synthetic filament yarn as the core with conductive bicomponent fibers.
Second, the present invention resides in the above-described fabrics wherein the conductive yarn is structured by double-covering synthetic filament yarn as the core with conductive bicomponent fibers.
Thirdly, the present invention resides in the above-described fabrics wherein the conductive yarn is contained in both of the warps and wefts at intervals thereof and that in one is structured by double-covering synthetic filament yarn as the core with conductive bicomponent fibers and the other is structured by single-covering synthetic filament yarn as the core with conductive bicomponent fibers.
Fourthly, the present invention resides in the above-described fabrics wherein the conductive yarn is contained in both of the warps and wefts at intervals thereof and that in one is structured by double-covering synthetic filament yarn as the core with conductive bicomponent fibers and the other is double-twisted yarn composed of synthetic filament yarn and conductive bicomponent fibers.
Fifthly, the present invention resides in the above-described fabrics wherein the degree of coverage of the conductive bicomponent fiber in the conductive yarn is 20 to 70%.
Sixthly, the present invention resides in the above-described fabrics wherein the conductive bicomponent fiber comprises carbon and the electric resistance thereof is 10
6
-10
9
&OHgr;/cm.
Seventhly, the present invention resides in the above-described fabrics wherein the conductive bicomponent fiber is obtained by bicomponent spinning a non-conductive base polymer and a
Matsui Yutaka
Takagi Susumu
Dilworth & Barrese LLP
Ruddock Ula C.
Seiren Co. LTD
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