JPS6032933B2 - Method for manufacturing conductive elastomer molded products - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a conductive elastomer molded article suitable for a pressure bush holding type conductive elastomer connector or an electric field shield gasket.

Conventionally, as a manufacturing method for conductive elastomer molded products, for example, a conductive material and an insulating material are stacked alternately in sheet form and integrated, and this is cut into thin strips in the lamination direction to create a striped sheet. A method in which the sheets are laminated and integrated by interposing insulating materials in the form of sheets, and then cut into thin pieces again in the lamination direction and in the direction perpendicular to the stripes (Referring to J.K. No. 52-29958) (see Japanese Patent Publication No. 398,232 and US Patent No. 398,232), these methods require the lamination and cutting steps to be carried out twice, which makes the work complicated and reduces the final yield. The drawback is that the cost of the conductive elastomer molded product is high.

The present invention aims to provide a method for producing an electrically conductive elastomer that eliminates the above-mentioned conventional drawbacks. The conductive material layer is linearly removed using a method to form parallel protrusions made of the conductive material on the carrier sheet at regular intervals, and then an electrically insulating elastomer layer is integrally laminated over the protrusions. Then, a plurality of conductive elastomers obtained by peeling off the carrier sheet are laminated and integrated with the orientation direction of the protrusions to form a block-like body, and finally the block-like body is separated from the protrusions. This method is characterized by slicing in a plane perpendicular to the orientation direction.

The conductive elastomer molded product obtained by the method of the present invention is said to be extremely useful, for example, as interconnectors for various circuits or electric field shield gaskets, and can be manufactured easily and continuously by the method described above. be able to.

Next, the method of the present invention will be explained based on the attached drawings.

In the method of the present invention, a layer made of an electrically conductive material is first provided on a carrier sheet by a laminating method, a topping method, etc., and for example, as shown in FIG. A carrier sheet 1 and a sheet-like body 4 made of a conductive material are inserted between the carrier sheet 1 and the press roll 3, and conductive material is applied onto the carrier sheet by rotating the rolls 2 and 3 at appropriate speeds in the directions of the arrows. The layer 4' made of a transparent material can be easily and uniformly provided. The carrier sheet used in the present invention can be made of various materials, such as synthetic resins such as polyethylene terephthalate, polypropylene, and polystyrene, nitrocellulose, and acetyl cellulose. Examples include cellulose esters such as rayon, regenerated cellulose such as viscose, and metal foils.

In addition, the haze-conducting materials used in the present invention include synthetic resins such as polyvinyl chloride, polyethylene, polypropylene, and phenol resin, and synthetic rubbers such as natural rubber, butylene-styrene rubber, neorene rubber, butadiene acrylonitrile, and silicone rubber. Examples include those containing one or more conductivity imparting agents such as carbon black, metal powder, or graphite. This conductive material is used in the form of a sheet, but the sheet may be in an uncured, semi-cured or cured state. Note that the layer 4' made of the above-mentioned conductive material
When providing the carrier sheet on the carrier sheet, an adhesive or an insulating rubber material layer may be used as appropriate for the purpose of improving the formation of cotton-like protrusions described below, but in these four cases, the carrier sheet must be peeled off. It is preferable to select and use the type of adhesive etc. in consideration of this.

The thickness of the layer 4' made of electrically conductive material is arbitrary depending on the use of the anisotropically conductive elastomer molded product finally obtained by the method of the present invention, for example, as a connector for electronic circuits. When used as
When used as a waveguide or other radio wave or electric field shielding gasket, it is preferably in the range of approximately 10 m to 1 m.

In the method of the present invention, a part of the layer 4' made of the conductive material provided on the carrier sheet 1 as described above is removed using a comb-like jig, and the layer 4' made of the conductive material is placed on the carrier sheet 1. When the conductive village layer 4' is uncured or semi-cured, for example, when the conductive village layer 4' is uncured or semi-cured, electrically independent vertical protrusions are formed in parallel. A roll (comb-like pick-up tool) 5 having a plurality of parallel grooves along the circumferential direction on the entire circumferential surface of the roll so as to be in contact with each other;
A device consisting of a pressure roll 6 and a touch roll 7 provided in contact with the roll 5 may be used to rotate the rolls 5 and 6 in the directions of the arrows, respectively. According to this, the circumferential surface of the roll 5 The layer made of the conductive material on the carrier sheet having a shape matching the cross-sectional shape of the convex portion provided on the carrier sheet can be easily removed.

Further, when the conductive material 4' is in a hardened state, it is necessary to actively cut and remove a portion thereof using a suitable combing tool. In addition, examples of the above-mentioned blade-shaped pick include one in which the convex part has a triangular cross-section and the concave part has a trapezoidal cross-section, as shown in FIG. have a square cross section, as shown in figure c, the convex part has a semicircular cross section and the concave part has a V shape, or as shown in figure d, the convex part and the concave part each have a cross section. In addition to examples of trapezoidal cutting blades, although not shown in the drawings, flat plate-shaped cutting blades in which a plurality of cutting blades are arranged in a comb-like shape can also be used in the present invention. However, the inside of the convex portions and concave portions may be arbitrarily selected depending on the use of the anisotropically conductive elastomer finally obtained, and is not particularly limited.

Note that when removing a part of the layer 4' made of conductive material provided on the carrier sheet 1 with a comb-like jig, the removal depth is the same as the distance between the carrier sheet 1 and the layer 4' made of the conductive material. Usually, this is done by adjusting the pressing force of the pressing roll 6, or by appropriately selecting the materials of the carrier sheet 1 and the conductive material 4' to adjust the hardness difference. It will be done. However, the carrier sheet 1 is stretched on one side because it is pulled under pressure by the topping roll 2, the pressure roll 3, the blade-like jig 5, the pressure roll 6, and the touch roll 7.
is likely to cause eccentricity, and the thickness of the carrier sheet itself is not necessarily uniform, so the removal depth may be too shallow or too deep, which is not always desirable. Therefore, it is desirable to set the deletion depth slightly deeper. The carrier sheet and the conductive protrusions 4'' integrated as described above are passed through a heating device 8 as necessary to harden or semi-cure the protrusions, and then the carrier sheet 1 An electrically insulating elastomer layer is laminated and integrated over the protrusions 4'' provided on the ridges.

Examples of the electrically insulating elastomer include various synthetic resins or rubbers that exhibit rubber-elastic behavior, such as polyvinyl chloride, polypropylene, polyolefin, polyester, polymethyl methacrylate, polyamide, Urea resin, polycarbonate, acetal resin, styrene resin, unsaturated polyester,
Examples include polyurethane, organopolysiloxane, phenol resin, and guanamine resin. This elastomer layer is supplied in a sheet-shaped state, but
This sheet-like body is in an uncured or semi-cured state, and when laminated and integrated, it is densely filled into the gap between the protrusions 4'' made of conductive material and hardened and integrated.Thickness of the elastomer 9 As with the thickness of the layer made of the conductive material described above, the thickness may be set arbitrarily depending on the purpose of use of the conductive elastomer to be obtained. In order to ensure that the layers 9 are integrated, an adhesive may be interposed between them.

In the method of the present invention, the carrier sheet 1 is then peeled off from the integrated sheet using the roll 11, and the take-up roll 12
, 12' to form a conductive elastomer sheet 13 as shown in FIG. 3, which is then cut into appropriate lengths.

In the next step, the plurality of conductive elastomer sheets 13' thus obtained are as shown in FIG.
The convex strips 4'' made of the conductive material are laminated and integrated in the same direction in the whale direction, and if necessary, an insulating elastomer layer 14 is formed on the surface where the conductive material layer 4'' of the laminated body is exposed.
Then, in the final step, the laminated and integrated block-shaped molded body is sliced along a plane perpendicular to the orientation direction of the protrusions 4'', thereby producing the desired conductive elastomer as shown in FIG. It can be made into a molded product.

As explained above, according to the method of the present invention, the desired conductive elastomer molded product can be easily obtained through a simplified process, and the arrangement pitch of the conductive protrusions is one skin or less, and the density is low. Since even high-quality elastomer molded articles can be manufactured easily and inexpensively, the practical effects of the method of the present invention are extremely large.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram of an apparatus system for carrying out the method of the present invention;
Fig. 2 is a perspective view showing different aspects of the blade-like picker, Fig. 3 is a perspective view of a conductive elastomer sheet obtained in an intermediate step of the method of the present invention, and Fig. 4 is a lamination and integration step. FIG. 5 is a perspective view of a conductive elastomer molded product obtained by the method of the present invention. 1...Carrier sheet, 2...Topping roll, 3,
6... Press roll, 4... Conductive material, 5
・・・・・・〈Blade-shaped sling tool, 7...Touch roll, 8・
... Heating device, 9 ... Elastomer sheet, 10
,10′...laminate. roll, 12, 12'... take-up roll. Figure 1 Figure 2 Figure 3 Figure 4 Figure 5

Claims (1)

[Claims] 1 A layer made of conductive material is provided on the carrier sheet,
Next, the conductive material layer is linearly removed using a comb-like jig to form parallel protrusions made of conductive material on the carrier sheet at regular intervals, and then the protrusions are covered for electrical insulation. A plurality of conductive elastomer layers obtained by laminating and integrating the conductive elastomer layers and then peeling off the carrier sheet are laminated and integrated with the orientation direction of the ridges aligned to form a block-shaped body, and finally, the block-shaped body is formed. 1. A method for producing a conductive elastomer molded article, which comprises slicing the body in a plane perpendicular to the orientation direction of the protrusions.