JPS6032931B2 - 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 product suitable for a pressure-supported conductive elastomer connector or an electric field shield gasket.

Conventionally, the manufacturing method for conductive elastomer molded products is as follows:
For example, a conductive material and an insulating material are stacked alternately in sheet form to form a laminated body, this is cut into slices from the top and bottom directions to produce a cotton-like sheet, and then an insulating material is applied to the sheet in the form of a sheet. A method of laminating and integrating the layers alternately by interposing them, and then cutting them into slices from the upper and lower sides in all directions and from the direction perpendicular to the cotton (Japanese Unexamined Patent Publication No. 52-29958 and U.S. Pat. No. 39823
However, these methods require the lamination and slicing steps to be carried out twice, which makes the work complicated, and also reduces the quality of the final conductive elastomer molded product. However, it has the disadvantage of high cost.

The present invention aims to provide a method for producing an electrically conductive elastomer that eliminates the above-mentioned conventional drawbacks. After removing the conductive material layer in a linear manner using a blade-like pick-up tool so that the conductive material layer forms parallel convex linear bodies at regular intervals on the carrier sheet, It is characterized in that an electrically insulating sheet is integrally laminated thereon so that it is not press-fitted between the linear conductive material layers, and then the carrier sheet is peeled off.

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 a conductive material is first provided on a carrier sheet 1 by a lamination molding method, a topping molding method, or the like. At the same time, the carrier sheet 1 is inserted between the topping roll 2 and the pressure roll 3, and these rolls 2, 2' and 3 are rotated at an appropriate speed in the direction of the arrow. By doing so, the layer 4' made of conductive material can be easily and uniformly provided on the carrier sheet. 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, acetyl cellulose, etc. Examples include cellulose esters such as rayon, regenerated cellulose such as viscose, and metal foils.

In addition, the conductive 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, neopreso rubber, butadiene acrylonitrile, and silicone rubber. etc., mixed with one or more conductivity imparting agents such as carbon black, metal powder, or graphite, or synthetic resins, natural or synthetic rubbers, etc. as described above, and conductive paints, conductive materials, etc. An example is one coated with a adhesive or the like.

In addition, when providing a layer made of the above-mentioned conductive material on a carrier sheet, an adhesive may be used as appropriate for the purpose of improving the formation of cotton-like protrusions described below, but in this case, the carrier sheet is It is preferable to select and use the type of adhesive in consideration of peeling. The thickness of the layer 4' made of electrically conductive material is determined depending on the intended use of the anisotropically conductive elastomer molded product finally obtained by this method, for example as a connector for electronic circuits. When used, it is preferably in the range of approximately low Am to 5, and when used as a waveguide or other radio wave or electric field shielding gasket, it is preferably in the range of approximately loAm to IQ.

In the method of the present invention, a part of the layer 4' made of conductive material before vulcanization provided on the carrier sheet 1 as described above is removed using a comb-shaped jig, and Electrically independent cotton-like convex stripes made of conductive material are formed in parallel, and specifically, they are formed along the entire circumferential direction so as to be in contact with the layer 4' made of conductive material. Roll with multiple parallel grooves (blade-shaped pick-up tool)
5. Using a device consisting of a pressure roll 6 and a touch roll 7 provided in contact with the roll 5, the rolls 5 and 6 may be rotated in the directions of the arrows, respectively. 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 peripheral surface can be easily removed.

Note that this blade-shaped picker includes, for example, one in which the convex part has a triangular cross section and the concave part has a trapezoidal cross section, as shown in Fig. 2a, and a convex part and a concave part as shown in Fig. 2b. have a square cross section, and as shown in Figure c, the convex part has a semicircular cross section and the concave part has a cross section of
Alternatively, as shown in FIG. d, the convex portion and the concave portion each have a trapezoidal cross section.

In addition, although this drawing shows straight lines parallel to the circumference as the convex and concave shapes, these are not necessarily limited to straight lines; for example, they may be composed of curved lines such as sine curves. It may also be something you have.

Further, in this drawing, examples of the comb blade-like sash tool include one in which parallel unevenness is provided on the circumferential surface of a cylindrical body and one in which a plurality of cutting blades are arranged in a comb blade shape, but in the present invention, a flat plate However, in any case, the inside of the above-mentioned convex portions and concave portions may be arbitrary depending on the use of the anisotropically conductive elastomer finally obtained. It is not particularly limited. In addition, when removing a part of the layer 4' made of conductive material provided on the carrier sheet 1 with a comb-like cutting tool, the depth of deletion is as shown in FIG. It is preferable to extend the pressure up to the interface with the layer 4' made of a soft material, and usually this is done by adjusting the pressing force of the pressing roll 6 or by adjusting the pressing force of the pressing roll 6.
Alternatively, the difference in hardness may be adjusted by appropriately selecting the materials of the carrier sheet 1 and the layer 4' made of conductive material.

However, the carrier sheet 1 is the topping roll 2
Since the pressure roll 3, the blade-like guide 5, the pressure roll 6, and the touch roll 7 pinch and take it off, the carrier sheet tends to stretch on one side and is eccentric, and the thickness of the carrier sheet itself is not always uniform. Therefore, if the deletion depth position is too shallow (Fig. 4b) or too deep (Fig. 4c), it is unlikely that the situation shown in Fig. 4a will necessarily occur, so please set the deletion depth in advance. It is also possible to set it slightly deeper as shown in FIG. 4b. When the elastomer obtained by the present invention is used for applications such as interconnectors or electric field shield gaskets, it can be made of a conductive material obtained by removing a part of the conductive material layer using a blade-like jig. It is necessary that the protrusions be electrically independent from each other, and in the state shown in FIG. 4b, the function as an interconnector or electric field shield gasket will be significantly impaired. The carrier sheet and the conductive protrusions 4'' integrated in this way are finally cured or semi-cured by passing through a heating device 8 as necessary, and then provided on the carrier sheet 1. Convex strip 4"
An electrically insulating elastomer sheet is laminated on top and integrated.

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, and urea resin. , polycarbonate, acetal resin, styrene resin, unsaturated polyester, polyurethane, organopolysiloxane, phenolic resin,
Examples include guanamine resin. The thickness of this elastomer sheet 9, like the thickness of the layer made of the electrically conductive material described above, may be arbitrary depending on the purpose or usage of the electrically conductive elastomer obtained from it. In this case, an adhesive may be interposed between the protrusions 4'' and the elastomer sheet 9 in order to reliably integrate them.

In the method of the present invention, the carrier sheet 1 is then peeled off from the integrated sheet using a roll 11, and the take-up roll 12,
By continuously taking it off at 12', a desired conductive elastomer molded product 13 as shown in FIG. 3 can be obtained, which is then cut into appropriate lengths for use.

Note that it is preferable to polish the surface of the flocculent ridges of the conductive elastomer molded article 13 thus obtained to completely prevent short circuits between the flocculent ridges. As explained above, according to the method of the present invention, a conductive elastomer molded product having conductive protrusions arranged in parallel on the surface of an electrically insulating elastomer sheet can be produced using a difficult process as in the conventional method. It can be obtained continuously in an extremely simple process without going through any steps, and its effectiveness is extremely large.

[Brief explanation of the drawing]

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 comb-shaped jig, FIG. 3 is a perspective view of a conductive elastomer molded product according to the present invention, and FIG. 4 is a perspective view showing the position of the depth of deletion. . 1... Carrier sheet, 2, 2'... Topping roll, 3, 6... Press roll, 4... Conductive material, 5... Comb blade-shaped tool, 7... touch. roll, 8... heating device, 9... elastomer sheet, 10, 10'... laminating roll, 12, 12'...
…Takeover roll. Figure 3 Figure 1 Figure 2 Figure 4

Claims (1)

[Claims] 1 A layer made of conductive material is provided on the carrier sheet,
Before vulcanization, the conductive material layer is linearly removed using a comb-like jig so that the conductive material layer forms parallel convex linear bodies spaced at regular intervals on the carrier sheet. A method for producing a conductive elastomer molded article, comprising: laminating an electrically insulating sheet over the convex shape so that it is not press-fitted between the linear conductive material layers, and then peeling off the carrier sheet.