JPH0193312A - Manufacture of laminate - Google Patents

Abstract

PURPOSE:To shorten the molding time and uniform the quality of laminates by inserting laminates of required numbers consisting of resin impregnated bases and metal foils between press platens and heat and pressure molding the same under a given molding condition. CONSTITUTION:Required number of pieces of resin impregnated bases are overlapped and required numbers of laminates on the upper and lower surfaces of which metal foils are placed and inserted between press platens, and the material is heated and pressurized for 10-90 minutes with the platen temperature higher by 2-20 deg.C than the optimum temperature for laminate molding and then the platen temperature is lowered to the optimum temperature for laminate molding and heat and pressure molded. At that time, if the platen temperature is lower than 2 deg.C, and the heating and pressurizing time is less than 10 minutes, the temperature rise of a central section between the platens can be achieved speedily, while when the temperature is more than 20 deg.C and for more than 90 minutes, the curing degree of the platen side laminates is too large and a defective quality is generated.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to a method for manufacturing a laminate used for electrical equipment, electronic equipment, computing equipment, communication equipment, etc.

[Background technology]

Conventionally, laminates used for electrical equipment, etc. are made by impregnating a base material such as paper or glass cloth with resin varnish and drying it, then stacking 8 to 15 sets of metal foil on top of the required number of resin-impregnated base materials. It is obtained by heat-pressing molding between the plates, but the temperature rise in the center laminate is higher than that of the laminate in the center between the hot plates. The process is slow, the molding time is extended, and the quality difference between the hot platen side laminate and the center laminate is unavoidable.

[Purpose of the invention]

The object of the present invention is to shorten the lamination molding time and to eliminate variations in quality of the laminated body between hot plates.

[Disclosure of the invention]

In the present invention, a required number of resin-impregnated base materials are stacked, and a required number of laminates with metal foil arranged on the upper and/or lower surfaces are sandwiched between press hot plates, and the laminate is formed at a temperature of 2 to 20°C above the optimum temperature for forming the laminate.
The laminate manufacturing method is characterized by heating and pressurizing the hot platen at a high temperature for 10 to 90 minutes, then lowering the hot platen temperature to the optimum temperature for forming the laminate, and then heating and press forming. Since the temperature of the central laminate increases quickly, the total molding time can be shortened and the quality of the laminate between hot plates can be made uniform.The present invention will be described in detail below.

As the resin for the resin-impregnated base material used in the present invention, phenol
1L/resin, creso/L' resin, epoxy resin, unsaturated polyester/1/resin, melamine resin, polyimide,
Thermosetting resins in general such as diallyl phthalate resins can be used singly, modified products, or mixtures. Base materials include gaffs, inorganic fibers such as asbestos, polyester,
Base materials include organic synthetic fibers such as polyamide, polyvinyl alcohol, polyacrylic, polycrethane, and polyimide, natural fibers such as cotton, woven fabrics, nonwoven fabrics, mats, paper, and combinations thereof. Metal foils include copper, 7 to minicum,
It is also possible to use a foil made of iron, nickel, zinc, etc. alone or an alloy, and if necessary, provide an adhesive layer on one side of the foil to improve adhesiveness. First, heat and press the hot platen temperature 2 to 20 degrees higher than the optimum temperature for forming the laminate for 10 to 90 minutes, but if it is less than 2 degrees Celsius or less than 10 minutes, the temperature at the center between the hot platens will increase quickly. Unable to do so, the temperature exceeded 90°C.
If the temperature exceeds 10 minutes, the degree of hardening of the laminated body on the hot platen side will be greatly reduced, resulting in many quality defects.

The present invention will be explained below based on examples.

Example: A phenolic resin face with a resin amount glossy weight% (hereinafter simply referred to as %) was impregnated with kraft paper having a thickness of 0.2 so that the resin amount was W%, and dried to obtain a resin-impregnated base material. . Next, stack 8 sheets of the resin-impregnated base material, and further coat the upper and lower surfaces with a thickness of 0.03 mm.
A laminate 13, in which 5 fl of copper foil with an adhesive layer was arranged with the adhesive-shaving side facing the resin-impregnated base material, was sandwiched between hot plates, and the molding pressure was 10 kg/cd, and the hot plate temperature was 170''C. After heating and pressurizing the plate with the same molding pressure, the temperature of the hot plate was increased to 160℃.
"C" and heated and pressure molded for (up to) minutes to a thickness of 1.6
I got a copy of the familiar copper cladding report board.

Comparative Example Thirteen sets of the same laminates as in the example were sandwiched between hot platens, and a molding pressure of 1 was applied.
00 kg/cd for 90 minutes at a heating plate temperature of 160°C (
80 minutes is insufficient curing) Heat and pressure molding to a thickness of 1.6f
A copper clad laminate B of f was obtained.

〔Effect of the invention〕

As is clear from Table 1, the hardness and molding time of the laminates of Examples and Comparative Examples obtained by the method of manufacturing laminates of the present invention had good performance, demonstrating the superiority of the present invention. confirmed.

Table 1

Claims (1)

[Claims] (1) Layer the required number of resin-impregnated base materials, and then place the required number of laminates with metal foil on the top and/or bottom surfaces between press hot plates, 2 to 20°C above the optimum temperature for laminate molding. 1. A method for manufacturing a laminate, which comprises raising the temperature of the hot platen to a high temperature, heating and pressing for 10 to 90 minutes, and then lowering the hot platen temperature to the optimum temperature for forming the laminate, and carrying out heating and pressing.