JPH07314476A - Manufacture of laminate board - Google Patents

Abstract

PURPOSE:To manufacture a laminate board wherein voids are scarecely generated by improving the constitution of a cushion material. CONSTITUTION:The cushion material is composed of a heat insulation material 3 laid in the central portion and a layer of a rubber sheet (silicone rubber) mixed with glass woven cloth and a layer of copper foil 4 disposed at both sides thereof in this order, each interlayer being integrated with prepreg 5 (glass woven fabric base material epoxy resin). Herein, predetermined sheets of a glass woven fabric base epoxy resin prepreg and glass non-woven fabric base epoxy resin prepreg are put each other to be held by a stainless mirror plate. Twelve sets of this composition are placed between heat press plates to be subjected to a heat press forming process for two hours with a pressure of 80kgf/cm<2> at a temperature of 170 deg.C by interposing a cushion material between the outermost mirror plate and the heat press plate, thereby manufacturing a composite laminate board.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a laminated board by heating and pressing a prepreg between hot plates to form a laminated board. In particular, the present invention relates to a cushioning material which is used by inserting a prepreg sandwiched between mirror surface plates into a heating platen and interposing it between the mirror surface plate and the heating platen.

[0002]

2. Description of the Related Art Conventionally, the above cushion material has been obtained by combining a heat insulating material (sheet made of aramid fiber or inorganic fiber) and a rubber sheet and stacking them, and has a thickness of 35 μm
The one that has the copper foil placed on it is used. For example, as shown in FIG. 2, the layer of the rubber sheet 2 and the layer of the copper foil 4 are arranged in this order on both sides of the layer of the heat insulating material 3, and the layers are integrated by the prepreg 5. There is. As shown in FIG. 4, the cushion material 7 includes a laminated plate constituent material 6 (a prepreg sandwiched between mirror surface plates) on a heating plate 8,
In order to form a laminated plate by putting it in between 8 and heating and pressurizing, it is used by being arranged between the mirror plate and the inside of the heating plate 8. The copper foil 4 forming the cushion material 7 is used for the purpose of preventing the mirror plate and the cushion material sandwiching the prepreg or the hot platen and the cushion material from sticking to each other. Such a cushion material has a function of adjusting the heat and pressure transmitted from the hot platen to the prepreg so that the laminated plate can be favorably molded.

[0003]

However, in molding a laminated plate using the above cushion material, the rubber sheet 2 is easily deformed in the surface direction due to the pressure during molding. FIG. 3 shows this state, but the perimeter extends from the regular shape shown by the dotted line A to the shape shown by the solid line B. Since the circumference of the cushion material is thin, it is a cause of voids around the molded laminate. The problem to be solved by the present invention is to improve the structure of the cushioning material to manufacture a laminated board with less generation of voids.

[0004]

In order to solve the above-mentioned problems, a rubber sheet containing a glass woven cloth is used as a cushion material constituting material in the production of a laminated board according to the present invention.

[0005]

Since the rubber sheet containing the glass woven cloth is reinforced by the glass woven cloth, the deformation in the surface direction is small even when pressure is applied. Therefore, by using such a rubber sheet as a constituent material of the cushion material, the pressure is uniformly applied, and it is possible to form a laminated plate with few voids in the periphery.

[0006]

EXAMPLE As shown in FIG. 1, a layer of a rubber sheet 1 (silicone rubber) containing a glass woven cloth and a layer of a copper foil 4 are arranged in this order on both sides of a layer of a heat insulating material 3, and each layer is Was integrated with prepreg 5 (glass woven fabric epoxy resin) to form a cushion material (Example). For comparison, the conventional cushion material described in FIG. 2 was prepared (conventional example). That is, in the conventional example, a silicone rubber sheet containing no woven glass cloth was used. The cushion materials used in the examples and the conventional examples have a rubber sheet and copper foil dimensions of 420 × 420 mm and a heat insulating material and prepreg dimensions of 400 × 400 mm. To check the effect, use each of the above cushion materials, 400 x 400
Molding of a 1.6 mm composite laminate was performed as follows. A predetermined number of glass woven cloth base material epoxy resin prepregs and glass non-woven cloth base material epoxy resin prepregs were piled up and sandwiched between stainless specular plates. This composition 1
Two sets are put into the press heating platen, and the above cushion materials are interposed between the outermost mirror surface plate and the press heating platen, and the pressure is 80%.
Kgf / cm ² at 170 ° C for 2 hours under heat and pressure,
Laminates were manufactured. Table 1 shows the results of measuring the amount of protrusion of the rubber sheet constituting the cushioning material from the periphery of the copper foil and the thickness distribution of the cushioning material after the molding. Table 1 also shows the results of measuring the lengths of the void generation regions at the four corners of the manufactured laminated plate.

[0007]

[Table 1]

From Table 1, it can be seen that the cushion material of the embodiment has little deformation in the surface direction and the thickness distribution thereof is ¼ of that of the conventional cushion material. Further, it can be seen that the lengths of void generation regions at the four corners of the manufactured laminated plate are 1/2 of those of the conventional one.

[0009]

As described above, in the manufacturing method according to the present invention, since the deformation of the cushion material used in the surface direction is small, it is possible to form a laminated plate with few voids.

[Brief description of drawings]

FIG. 1 is an explanatory diagram showing a layer structure of a cushion material used in an example according to the present invention.

FIG. 2 is an explanatory view showing a layer structure of a cushioning material used in manufacturing a conventional laminated board.

FIG. 3 is a plan view for explaining a surface direction deformation of a cushion material used in manufacturing a conventional laminated plate.

FIG. 4 is an explanatory diagram showing a state when a laminated plate is formed between press hot plates.

[Explanation of symbols]

 1 is a rubber sheet containing glass woven fabric 3 is a heat insulating material 4 is a copper foil 5 is a prepreg

Claims (1)

[Claims] 1. A rubber containing glass woven cloth in the production of a laminated plate in which a prepreg sandwiched between mirror surface plates is put into a hot platen, and a heating and pressure molding is performed with a cushion material interposed between the mirror plate and the hot platen. A method for manufacturing a laminated board, characterized in that a sheet is used as a constituent material of a cushion material.