JP2006054173A - Electric wire binding method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electric wire binding method in which voids do not remain in a fused sealing material, and furthermore in which dispersion of a magnetic material in the sealing material and a grommet is not needed. <P>SOLUTION: This is the electric wire binding method in which the grommet having a pressurizing restoring force is covered on a plurality of copper wires sealed in a heat-fusible resin tube which is the sealing material for the electric wire binding, in which the tube is made to be heat-fused by making the copper wires heated by induction heating, in which the fused sealing material is pressurized by an elastic contractile force of the grommet, in which the electric wires are bound by filling in the gaps between mutual electric wires by the heat-fusible resin, and which is integrally formed with the grommet. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a method for bundling electric wires, in which a plurality of electric wires are integrally fused with molten resin, gaps between the electric wires are eliminated, and sufficient waterproof performance is ensured in a bundling portion of the electric wires.

  Conventionally, a plurality of electric wires passed through a hole in a dashboard that partitions between an engine room and a vehicle compartment of an automobile are sealed with a plurality of electric wires in order to prevent water from entering between the electric wires. They are united by fusing. As such a bundling method, for example, as shown in FIG. 1, a grommet (thermal shrinkage) having heat-resistant elastic contraction force is provided on the outer periphery of a plurality of electric wires coated with a heat-meltable resin tube which is a sealing material for electric wire bundling. After the tube is wound, there is a method in which the grommet is heated with hot air or the like, the melted sealing material is pressurized and poured between the wires, and a plurality of wires are bound and integrated with the grommet.

  In addition, using a sealing material and grommet to which a magnetic material is added, applying a high frequency from the outside, inductively heating the magnetic material in an alternating magnetic field, and melting the sealing material by the generated heat, at the same time, elastic contraction force of the grommet Thus, there is known a method in which a molten sealing material is pressurized and poured between electric wires, and a plurality of electric wires are bound and integrated with a grommet.

  However, since the method using the hot air is external heating, the grommet may be deteriorated by heat, or the molten sealing material may not be uniformly heated, leaving voids in the molten sealing material. There is a problem of drowning. In addition, the method using the magnetic material requires a high-cost process of kneading and dispersing the magnetic material in a sealing material and a grommet. In addition, the addition of a magnetic substance has an adverse effect on the physical properties of the sealing material or grommet.

  Accordingly, an object of the present invention is to provide an electric wire binding method that does not leave voids in a molten sealing material and does not require dispersion of a magnetic material in the sealing material and the grommet.

The above object is achieved by the present invention described below.
That is, the present invention covers a plurality of copper wires sealed in a heat-meltable resin tube, which is a wire binding sealing material, with grommet having a pressure restoring force, and heats the copper wires by dielectric heating. The tube is heated and melted, and the molten sealing material is pressurized by the elastic contraction force of the grommet. The gap between the wires is filled with a heat-melting resin to bind the wires, and the grommet is integrated. An electric wire binding method is provided.

  According to the present invention, a plurality of electric wires are integrally fused with a molten resin in a simple manner without cost, and the gap between the electric wires is eliminated and integrated with the grommet. Sufficient waterproof performance can be ensured.

Next, the present invention will be described in more detail with reference to the best mode for carrying out the invention.
In the present invention, as shown in FIG. 1, a plurality of electric wires covered with a heat-meltable resin tube, which is a wire-binding sealing material, are covered with a grommet (heat-shrinkable tube) having heat-resistant elastic shrinkage. Prepare. This is set in an induction heating device, and the heat generation of the copper wire in the electric wire is controlled so that the grommet does not melt and only the sealing material melts.

  The heat-meltable resin used for the tube as the sealing material is not particularly limited as long as it is excellent in adhesiveness to an electric wire and has a lower melting point than vinyl chloride, polyethylene and the like used for electric wire coating. Examples of such polymers include polyvinyl chloride, vinyl chloride copolymers such as vinyl chloride / vinyl acetate; polyethylene, ethylene / vinyl chloride copolymer, ethylene / vinyl chloride / vinyl acetate copolymer, ethylene / vinyl alcohol copolymer, ethylene / vinyl alcohol copolymer, Ethylene such as vinyl acetate copolymer, ethylene / acrylic acid copolymer, ethylene / acrylic acid ester copolymer, ethylene / methacrylic acid copolymer, ethylene / methacrylic acid ester copolymer, ethylene / alpha olefin copolymer, ionomer, ethylene / ethyl acrylate / maleic anhydride copolymer -Based polymers; urethane-based polymers such as polyurethane and urethane-based copolymers; ester-based polymers such as polyester and ester-based copolymers; De, an amide-based polymers such as amide-based copolymers. These are also used as one or more polymer blends or polymer alloys.

  Among the above heat-meltable resins, at least one selected from vinyl chloride polymers, ethylene polymers, urethane polymers, ester polymers, amide polymers, mixtures of these polymers, and polymer alloys is particularly preferable.

  The copper wire in the electric wire is heated by induction heating, the tube covering the electric wire is heat-melted, and the gap between the electric wires is filled by pressurizing the molten sealing material by the elastic shrinkage force of the grommet. The electric wires can be bundled and integrated with the grommet, and sufficient waterproof performance can be ensured in the bundling portion of the electric wires.

The figure explaining the method of this invention.

Claims (3)

  Cover a plurality of copper wires sealed in a heat-meltable resin tube, which is a wire-bonding sealing material, with grommet with pressure restoring force, and heat the copper wire by dielectric heating to heat-melt the tube. An electric wire binding method characterized by pressurizing a melted sealing material by an elastic contraction force of a grommet, filling a gap between the electric wires with a heat-meltable resin to bind the electric wires, and integrating the electric wires with the grommet.   The electric wire binding according to claim 1, wherein the heat-meltable resin is at least one selected from a vinyl chloride polymer, an ethylene polymer, a urethane polymer, an ester polymer, an amide polymer, a polymer blend thereof, and a polymer alloy. Method.   The wire bundling method according to claim 1 or 2, wherein the grommet material is rubber or polymer having heat-resistant elastic shrinkage.

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