JPS6121388B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is directed to a new and improved method of manufacturing a connector.

In recent years, a plurality of thin metal film rings have been separately adhered to the circumferential surface of a rod made of an insulating rubber-like elastic material as a small connector used for connecting, for example, a liquid crystal display device and its drive circuit. Connectors have been developed for use with elastically interposed connectors. The above-mentioned connectors are usually made by pouring silicone rubber into a thin-walled copper pipe.
After curing, an etching method is used to leave multiple copper rings on the circumference of the silicone rubber rod.
Alternatively, it has been manufactured by forming a metal vapor deposition film on the circumferential surface of a rod made of an insulating rubber-like elastic material, and then using the same etching method to leave a plurality of metal rings.

However, all of the above-mentioned conventionally known methods include etching steps that require complicated work and time, and therefore have the disadvantages of low productivity and high costs.

The present inventors have previously developed a method for manufacturing a connector that can solve the above-mentioned disadvantages and disadvantages by using a tape-like flexible film having a conductive material layer coated on the inner surface in a striped manner. The conductive material layer and the core material are bonded together by wrapping them around a core material made of elastomer coated with an adhesive in advance and inserting them into a hollow tube having an inner circumference approximately equal to the width of the film. We considered integrating the core material, then pulling out the core material from the hollow tube, and then peeling off only the film from the core material, but, however,
This method has the disadvantage that the adhesive often protrudes from the joints of the tape-like flexible film inside the hollow tube, which stains the inner wall of the hollow tube and makes continuous production difficult over a long period of time.

The present invention provides a new and improved method of manufacturing a connector in view of the above-mentioned drawbacks, which comprises applying a conductive material layer to the inner surface of a core material made of an uncured rubber material. The method is characterized in that after a tape-like flexible film adhered in a striped manner is wound, the core material and the conductive material layer are cured and integrated, and then only the film is peeled off from the core material. According to the present invention, the conductive material layer adhered to the tape-like film is cured and integrated with the core material made of uncured rubber material without using an adhesive. The disadvantages and shortcomings of conventional methods associated with its use are eliminated, and the excellent effect of simplifying the manufacturing process is provided.

Hereinafter, the method of the present invention will be explained in detail according to its manufacturing process based on the accompanying drawings.

First, in carrying out the method of the present invention, as shown in FIG. A flexible film 2 having a layer 1...
is prepared.

The above-mentioned flexible film 2 has a conductive material layer 1 formed on its surface that adheres well, and after transferring this conductive material layer to the surface of the core material, the conductive material layer 1 is The film is made of a material that has good releasability, such as polypropylene, polyvinyl chloride,
Suitable materials include polyethylene, ethyl cellulose, cellulose diacetate, cellulose triacetate polyimide, polyamide, polyimide amide, and the like. Further, as for the thickness of the above-mentioned film, since this film will be bent under a considerably small radius of curvature in the next step, a thickness of about 5 to 200 .mu.m is appropriate in consideration of its rigidity and flexibility.

On the other hand, the layer 1 of the conductive material is made of conductivity-imparting agents such as carbon black, carbon fiber, graphite, aluminum, nickel, tungsten carbide, copper, silver, gold, etc., and other necessary additives such as oxidation. It is composed of a conductive paint made by uniformly dispersing inhibitors, lubricants, etc., and a layer of this conductive material is formed on the film according to various conventional and well-known painting methods and printing methods. Ru. Furthermore, the layer 1 of the conductive material thus formed may sag, cut, leak, etc. during the cutting process and the transfer process to the outer circumferential surface of the core material, which will be described later, so this should be prevented. For this purpose, it is preferable to previously provide a protective layer on the surface of the layer 1 of the conductive material. Suitable materials for this protective layer include the same type of material as the core material 6 made of an uncured rubber material, or silicone RTV, LTV that hardens or becomes solid at room temperature.

The flexible film 2 having the striped conductive material layer 1 on its surface obtained as described above preferably has a constant width W in a direction perpendicular to the orientation direction of the striped conductive material layer 1. It is cut into tape shapes with
In the method of the present invention, for example, as shown in FIG. , is inserted into the hollow tube 4 together with the core material. in this case,
The tape-like film 3 has a core material 6 in its length direction.
It is desirable that the conductive material layer 1 forms a ring by winding the conductive material layer 1 so that it coincides with the length direction of the core material 6.
It is assumed that the outer circumference of

The material of the core material 6 used in the present invention may be any uncured rubber compound, such as silicone rubber, synthetic rubber such as NBR, SBR, or IR, as long as it exhibits flexibility after curing or solidification. Although this is possible, it is desirable to use a material with low compression set, such as silicone rubber.

Furthermore, the hollow tube 4 used in the present invention
The above-mentioned tape-like film 3 is tightly bonded to the outer peripheral surface of a core material 6 made of an uncured rubber material, which is made of, for example, a glass tube, a metal tube, a plastic tube, etc., and its inner diameter is the same as that of the core material. The outer diameter is approximately equal to or slightly smaller than the outer diameter of the film 3 wrapped around the film 6, and the inner circumferential surface is made as smooth and uniform as possible, and the end, that is, the core material In order to facilitate the insertion of the core material 6 and the film 3, the insertion side portion may have a funnel-shaped expanded structure as shown in FIG. 2, if necessary.

Next, in the method of the present invention, as described above, the tape-shaped film 3 is wound around the core material 6 made of an uncured rubber material and is inserted into the hollow tube 4, and then the core material 6 is cured. or solidify to integrate the film 3 with the core material 6,
This can be done by simply heating the core material 6 etc. while it is inserted into the hollow tube 4.

In the present invention, as shown in FIG. 3, a conductive material layer is provided on the outer surface of the core material 6 made of an uncured material extruded from the die 7 of the extruder and shaped into a tube or rod shape. While wrapping the film 3 so that the inner side is inside, the film 3 is inserted into the hollow tube 4 placed at the tip of the die 7, and then introduced into the heating furnace 5 and heated continuously to form the core material 6. It is also possible to transfer and integrate the striped conductive material layer 1 on the outer circumferential surface at the same time as curing, and with this method, connectors can be manufactured continuously on a series of production lines, and there is no deformation distortion. A uniformly shaped connector can be easily obtained.

After completing the curing and unifying process in this way,
Then, by peeling off the film 3 from the surface of the core material, the fourth
As shown in the figure, a conductive material layer 1 is formed on the outer peripheral surface of the core material 6.
It is possible to obtain a connector 8 on which is adhered and formed.

The present invention will be described below with reference to Examples.

Example 1 As shown in Figure 1, the surface has a width C0.75mm,
A polyester film 3 with a thickness of 25 μm and a width of about 6.3 mm, on which a printed pattern 1 is applied in the form of stripes, is coated with a conductive coating material containing carbon black powder with a pitch P of 1.5 mm. As shown in Figure 1, with the pattern 1 on the inside, the outer diameter is 1.95 mm and the inner diameter is 1.95 mm.
The ends were temporarily attached to an uncured silicone rubber tube 6 with a length of 0.8 mm and a length of 230 mm, with the length direction aligned, and these were placed into a glass tube 4 with an inner diameter of 2 mm and a length of 200 mm.
The rubber tube 6 was inserted with 20 mm left at the end.

Next, the glass tube 4 with the tube 6 and film 3 inserted therein is placed in an oven and heated for 0 minutes at a temperature of 150°C to harden and integrate the silicone tube 6 and the striped conductive material layer. was removed from the oven, the silicone tube 6 was pulled out from the glass tube 4, and the polyester film 3 was peeled off from the rubber tube as shown in FIG. 4, to obtain a connector 8.

Example 2 As shown in Figure 1, the surface has a width C0.3mm,
A polyester film 3 with a thickness of 25 μm and a width of 6.3 mm, on which a striped printing pattern 1 has been applied using conductive paint containing silver powder with a pitch P of 0.6 mm, is passed through the die 7 of an extruder with an inner diameter of 0.8 mm as shown in Fig. 3. An uncured silicone rubber tube with a diameter of 1.95 mm and an outer diameter of The tubes were passed through a stainless steel tube with an inner diameter of 2 mm and a length of 100 mm placed immediately after the die 7 with the same direction, and after being continuously wrapped and adhered uniformly, a length of 1.2 m was kept at 300°C.
The silicone rubber rubber tube 6 was cured and the striped conductive material layer was cured and integrated by passing through a heating furnace 5 . Then, when the polyester film was peeled off, a long connector 8 was continuously obtained.

[Brief explanation of the drawing]

Fig. 1 is a plan view of a flexible film on which a layer of conductive material is formed in stripes to be used in the method of the present invention, and Fig. 2 shows the film being inserted into a hollow tube and wound around a core material. A schematic diagram showing the state, Figure 3, is a hollow tube in which a film is wrapped around the outer surface of a core material made of uncured rubber material immediately after being extruded from an extruder so that the conductive material layer is on the inside. FIG. 4 is a schematic diagram showing a state in which the film is inserted into a core material and then passed through a heating furnace to be cured. FIG. 4 is a schematic diagram showing a state in which the film is peeled off from the core material. 1... Conductive material layer, 2... Flexible film, 3...
Tape-shaped film, 4... Hollow tube, 5... Heating furnace, 6
...Core material, 7. Die of extruder, 8. Connector.

Claims (1)

[Claims] 1. After wrapping a tape-shaped flexible film consisting of a conductive material layer coated in stripes on the inner surface of the core material made of an uncured rubber material, the core material and the conductive material layer are wrapped. A method for manufacturing a connector, which comprises curing and integrating the film and film, and then peeling off only the film from the core material.