JPS6029136Y2 - Insulated wire - Google Patents

Description

[Detailed Description of the Invention] An object of the present invention is to provide an insulated wire with excellent flexibility, voltage resistance, and other properties suitable for use as a relay lead wire, for example.

To explain with reference to the drawings, the present invention includes a flexible single conductor or twisted conductor 1 and a specific gravity of 0.5 to
The conductor 1 is made of porous polytetrafluoroethylene resin of 0.9 mm.
A primary coating 2 that flexibly covers the outer periphery of the insulated wire, and a secondary coating 3 of solid fluororesin, which is adhered to the outer periphery of the primary coating and contains a pigment of a desired color in the material. This is the summary.

The expanded porous PTFE as the primary coating 2 is
It is produced by the stretching method disclosed in Japanese Patent Publication No. 18991 or Japanese Patent Publication No. 42-1358, and is extremely flexible.
In addition, it has high mechanical strength such as tensile strength, and the present invention uses a completely sintered or semi-sintered tape-like material of the expanded porous PTFE to be wrapped around the conductor 1 and used as the primary coating. Alternatively, an unfired or semi-fired tape-like material of expanded porous PTFE is wound around the conductor 1 and then heat treated to form a fully or semi-fired oxide, thereby forming the primary coating.

In the latter case, care should be taken to perform the heat treatment quickly so that the conductor 1 is not adversely affected by the heat.

The procedure may be such that the following secondary coating treatment is performed on the outer periphery of the coating layer 2 before the heat treatment of the primary coating 2.

The secondary coating 3 is a solid fluororesin tape-like material, such as PTFE or FEP, which is colored with a pigment to a desired color.
(copolymer resin of tetrafluoroethylene and hexafluoropropylene),
PFA (tetrafluoroethylene and perfluoroalkyl vinyl ether copolymer resin), ETFE (tetrafluoroethylene and ethylene copolymer resin), PCTFE (trifluorochloroethylene resin), PVdF (polyvinylidene fluoride resin), etc. This can be achieved by wrapping a solid tape-like material around the outer periphery of the secondary coating layer 2 and applying it.

Furthermore, since fluororesins other than PTFE can be melt-extruded, the secondary coating layer 3 can be formed using the melt-extrusion method for these resins.

- The thickness of the secondary and secondary coatings 2 and 3 is designed appropriately, but
The primary coating 2 can be relatively thick (for example, when the diameter of the conductor 1 is 0.5 mm, the thickness of the coating 2 is 0.28 mm).
ran, the thickness of the covering 3 is 0.07 mm), and the stretched porous PTFE of the primary coating 2 has a high specific gravity (stretching ratio - small), and the flexibility of the coated wire decreases. ) is allowed.

However, if the specific gravity is too small, pinholes may occur, voltage resistance may be poor, strength may be reduced, etc., so it is generally 0.
It is preferable to have a specific gravity of about 5 to 0.9.

In addition, for the stretched porous PTFE tape of the next coating 2, processability and quality (
For example, it has good dimensional stability and stripability.

As described above, the insulated wire of the present invention is manufactured by first applying a wire with a specific gravity of 0 to the outer periphery of a flexible single conductor or twisted conductor 1 by a drawing method.
．． A primary coating 2 of porous PTFE with a diameter of 5 to 0.9 is removed, and a secondary coating 3 of a solid fluororesin colored with a pigment to a desired color is applied around the outer periphery of the primary coating 2. The following effects can be obtained, and the wire is effectively suitable for use as a lead wire for a movable contact piece of a relay, etc., which requires good flexibility to withstand repeated rocking or bending.

a Specific gravity 0 manufactured by stretching method as primary coating 2
．． Porous PTF E with a diameter of 5 to 0.9 is extremely flexible, so it does not hinder the freedom of bending displacement of the conductor, and has high tensile strength, making the entire wire more flexible than when the primary coating 2 is made of solid material. It is highly flexible and does not easily break due to repeated swinging or bending, making it possible to obtain a long-life and stable electric wire.

b Since the porous primary coating 2 is covered with a solid secondary coating 3, the lack of withstand voltage of the primary coating 2 is satisfied and the secondary coating 3 is
In addition, the substantial secondary coating 3 prevents water, moisture, dirt, etc. from entering the porous primary coating 2, and prevents changes in the electrical characteristics of the primary coating 2. Therefore, the good withstand voltage characteristics of the entire wire can be stably maintained over a long period of time.

Since the primary coating 2 is made porous, the adhesion and adhesion between the primary coating and the secondary coating are stronger than when the primary coating 2 is made solid, so when cutting the wire or stripping the coating, It is difficult to cause so-called stretching misalignment of the coating.

d Since the outside is a solid coating 3, it is resistant to crushing, and therefore the coating can be removed by an automatic stripping machine without any problem.

e The solid body of fluororesin can be vividly colored with pigments, so by using solid fluororesin colored in the desired color as the outer coating 3, it is possible to easily obtain electric wires with various vivid colors. I can do it.

Incidentally, in the case of porous PTFE produced by the stretching method, if a pigment is added to the material for coloring, the stretching of the material becomes impossible, so it is impossible to obtain a material with a clear color other than white.

f - Both the secondary and secondary coatings 2 and 3 are made of PTFE or fluororesin with excellent heat resistance, chemical resistance, electrical insulation, etc., and plasticizers and solvents that cause changes in the coatings 2 and 3 or the conductor 1 over time. Therefore, the original wire characteristics are stably maintained over a long period of time.

[Brief explanation of the drawing]

The figure is a cross-sectional view illustrating the configuration of the proposed electric wire. 1 is a conductor, 2 is a primary coating of expanded porous PTFE, and 3 is a secondary coating of solid fluororesin.

Claims (1)

[Claims for Utility Model Registration] A conductor 1 having flexibility, and a flexible coating around the outer periphery of the conductor 1 made of porous tetrafluoroethylene resin having a specific gravity of 0.5 to 0.9 manufactured by a stretching method. An insulated electric wire comprising a primary coating 2 and a secondary coating 3 made of a solid fluororesin, which is coated on the outer periphery of the primary coating and contains a pigment in its material.