JPH05339834A - Conjugate bulk yarn containing metallic fiber - Google Patents

Abstract

PURPOSE:To obtain conjugate bulk yarn, containing metallic fiber capable of producing molding, good in impregnation with a resin, handling operating efficiency and electrical characteristics and increasing heat radiating effects in use. CONSTITUTION:The objective conjugate bulk yarn containing metallic fiber is prepared by integrating inorganic continuous filament 2 with organic continuous filament 3 and the metallic fiber 1 and bulking resultant yarn. This yarn is constructed by the presence of the metallic fiber 1 in an amount of 3-97% in the longitudinal direction in the interior and 97-3% in the longitudinal direction in the outer peripheral part. Since the yarn is not forcedly intertwisted and the metallic fiber is suitably present in the outer peripheral part, it has good heat radiating effects on generation of heat by friction when used as moldings of a friction material. On the other hand, good electrical characteristics such as destaticizing, antistatic and electromagnetic wave shielding properties and magnetic permeability are obtained when used as moldings of a usual resin.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a base material for friction materials used in automobiles, motorcycles and industrial machines, and a composite bulky processed yarn containing metal fibers used as a base material for modifying the electrical properties of plastics. More specifically, the present invention relates to a composite bulky processed yarn containing a metal fiber, which has good workability in molding with a resin and can obtain a homogeneous molded product.

[0002]

2. Description of the Related Art In recent years, bulky processed yarns such as inorganic fibers such as metal fibers and non-asbestos glass fibers and organic fibers have been used as base materials for friction materials and plastics, but they are still sufficiently satisfied. Currently, it is not a base material.

For example, in the case of a base material in which the continuous fibers constituting the core are coated with a entangled material of short fibers, it is difficult to obtain a base material having a constant thickness, and the short fibers are likely to fall off during handling work. There are problems such as. A method for solving these problems is disclosed in JP-A-58-87383. This method uses a bulky processed string in which at least one type of filament is coated around the fiber constituting the core and coated with continuous fibers which are entangled, for use as a friction material. Improve the glass fiber,
A carbon fiber, an organic fiber, a metal fiber or the like is uniformly dispersed and distributed to obtain a string having a constant thickness. However, since the bulky processed string for friction material has the metal fibers of the fibers forming the core continuously existing as the core material in the length direction of the string, the clutch fiber obtained by press molding after impregnating the resin for friction material is used. Since metal fibers are less likely to be present on the surfaces of the singing member and the braking member, that is, the friction surface, there is a problem that the heat radiation performance of heat generated when the friction material is used is not satisfactory.
Further, when it is used as a composite material of general resin molded products other than the above-mentioned members, there are problems in electric characteristics such as static electricity removal, antistatic property and heat generation. Further, as a method for solving these problems, for example, a base material in which bulky yarns such as glass long fibers and organic long fibers are forcibly twisted and integrated with metal fibers and metal fibers are scattered on the outer periphery is used. Although a method may be considered, in this case the heat dissipation of the molded product is good, but the impregnation speed becomes slow due to the viscosity of the commonly used resin for friction materials and the resin liquid for general molding, and the liquid resin concentration is reduced to It is necessary to lower the viscosity and prolong the residence time of the base material in the liquid resin. As a method to accelerate the impregnation speed of resin,
There is also a method to reduce the degree of twisting, but if the twisting is small, there are problems such as slackening of metal fibers, crimping, thread catching during work, causing trouble, and lack of homogeneity of the molded product. is there.

[0004]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned drawbacks of the conventional processed yarn for friction material and general processed yarn,
That is, an object of the present invention is to provide a composite bulky processed yarn containing a metal fiber, which has good resin impregnation, good handling workability, an improved heat dissipation effect during use, and is capable of producing a molded product having good electrical characteristics. To do.

[0005]

In order to solve this problem, the metal fiber-containing composite bulky processed yarn of the present invention comprises at least one or more of inorganic long fibers, carbon long fibers and organic long fibers, and metal fibers. In the composite bulky yarn containing metal fibers that are made bulky by integration, metal fibers are present in the interior in a proportion of 3 to 97% in the length direction, and metal fibers in the outer peripheral portion are 97 to 3% in the length direction. Exists and is composed of
And the gist is that they are not forcibly twisted. In this configuration, the outer peripheral portion means a portion where the metal fiber is visible from the outside, and the inner portion means a portion other than the outer peripheral portion.

In the composite bulky processed yarn containing metal fibers of the present invention, the long fibers are bulky processed to obtain a yarn having a stable thickness, the handling workability is good, and short fibers are not used. There is no drop of thread. Further, the composite bulky processed yarn containing metal fibers of the present invention uses inorganic long fibers, garbon long fibers, and organic long fibers that are easy to bulky as filaments for bulkiness and easy to form into filaments, and are used for friction materials, thermosetting It has a good impregnation property with a resin and the position of the metal fiber on the cross section where the composite bulky yarn is present in the length direction is inside at one place and at the outer periphery at a different place. When friction material molding or thermosetting resin molding is performed, since metal fibers are scattered near the press-molded surface, a heat radiation effect when frictional heat is generated and stable electric characteristics can be obtained. Further, the composite high-loft processed yarn containing metal fibers of the present invention has good impregnation property of liquid resin and does not need to reduce viscosity of liquid resin by integrating without being forcibly twisted. Almost no sagging or crimping occurs, no troubles occur due to yarn being caught during handling work, improving workability and homogeneity.

[0007]

With this constitution, the composite bulky processed yarn containing metal fibers of the present invention has good resin impregnation property, stable resin carry-in amount, good handling workability, and metal fibers are appropriately present on the outer peripheral portion. Therefore, when used for friction material molded products, it has a good heat dissipation effect against heat generation due to friction, while when used for general resin molded products, it eliminates static electricity, antistatic, heat generation, etc. Good electrical characteristics can be obtained, which is extremely excellent in practical use.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A composite bulky yarn containing metal fibers according to an embodiment of the present invention will be described in detail below with reference to the accompanying drawings. An external view of the composite bulky textured yarn containing metal fibers is shown in FIG. At the point A in the length direction, the metal fibers are present inside the composite bulky processed yarn, and at the point B, the metal fibers are present in the outer peripheral portion, so that the metal fibers 1, the inorganic long fibers 2, the organic long fibers 3 are present. It consists of As the metal fiber 1, a continuous metal fiber made of copper, brass, iron or the like is used. The inorganic long fiber 2 is an inorganic long fiber made of glass or the like, the organic long fiber 3 is an organic long fiber made of rayon, polyamide, polyester or the like, and if necessary, a carbon long fiber.

FIG. 2 is a view of a composite bulky processed yarn containing metal fibers.
3 is a cross-sectional view at point A, in which the metal fiber 1 exists inside. FIG. 3 is a cross-sectional view of the composite bulky processed yarn containing metal fibers at point B in FIG. 1, in which the metal fibers 1 are present in the outer peripheral portion.

In the composite high-loft processed yarn containing metal fibers of the present invention, metal fibers are present in the interior in a proportion of 3 to 97%, preferably 30 to 95% in the length direction, and 97 to 3% in the outer peripheral portion. Is present in a proportion of 70 to 5%, and there is almost no slack or crimp of metal fibers, and continuous metal fibers, inorganic long fibers, and organic long fibers are integrated without being forcedly twisted together. ing. Friction materials and general resin molded products obtained by using the composite bulky yarn in which the internal metal fibers are more than 97% and the outer metal fibers are less than 3% are inferior in heat dissipation and electric characteristics, which is preferable. Absent. On the other hand, in the case of a composite bulky yarn with less than 3% metal fibers inside and more than 97% metal fibers on the outer periphery, slack in the metal fibers, crimping, and the problem of the yarn being caught during handling work occur. Not preferable. Further, it is also possible to use as a base material for a heating element by mixing carbon fibers at the time of bulky processing or by using a preferable raw material of a heat generating substance by electricity of metal fibers.

[0011]

EFFECTS OF THE INVENTION The composite bulky processed yarn containing metal fibers of the present invention has good resin impregnation property, stable resin carry-in amount, good handling workability, and metal fibers appropriately present on the outer peripheral portion. Therefore, when used for friction material molded products, it has a good heat dissipation effect against heat generation due to friction, while when used for general resin molded products, it has good static electricity removal, antistatic, heat generation, etc. It has excellent electrical characteristics and is extremely excellent in practical use.

[Brief description of drawings]

FIG. 1 is an explanatory view showing the appearance of a composite bulky processed yarn containing a metal fiber in an example of the present invention.

FIG. 2 is a place A where the metal fiber in FIG. 1 exists inside.
It is sectional drawing in a point.

FIG. 3 is a cross-sectional view at a point B where the metal fiber in FIG. 1 exists in the outer peripheral portion.

[Explanation of symbols]

 1 Metal fiber 2 Inorganic filament 3 Organic filament

Claims (1)

[Claims] 1. A composite bulky yarn containing metal fibers, which is made by integrating at least one or more of inorganic long fibers, carbon long fibers, and organic long fibers with metal fibers to make them bulky. Is present in a ratio of 3 to 97% in the direction, and metal fibers are present in the outer peripheral portion in a ratio of 97 to 3% in the length direction, and are not forcibly twisted. Composite bulky yarn with metal fibers.