JPH06170970A - Production of laminated sheet - Google Patents

Abstract

PURPOSE:To continuously produce a laminated sheet reduced in warpage and distortion under a non-pressure condition. CONSTITUTION:A long base material of which both end parts are impregnated with a solvent (impregnation width; 0.5-10cm) is impregnated with a resin and long metal foils are laminated to the upper and/or rear surface of a required number of the resin impregnated long base materials to form a long laminate which is, in turn, subjected to continuous non-pressure laminate molding to be cut into required dimensions to produce a laminated sheet.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to electronic equipment, electric equipment,
The present invention relates to a method for manufacturing a laminated board used for a computer, a communication device and the like.

[0002]

2. Description of the Related Art Conventionally, in a laminated plate obtained by a pressureless continuous manufacturing method, resin impregnation on a base material, lamination, and resin curing are continuous, so that resin outflow from both ends of the resin-impregnated base material is prevented. Inevitably, the lower surface of the laminate sticks to the manufacturing equipment and internal strain occurs during continuous transfer of the laminate, and it is laminated with the built-in strain, so it warps to the laminated plate after lamination molding,
Twisting was generated and dimensional stability was reduced.

[0003]

As described in the prior art, there is a problem that the laminated plate obtained by the conventional pressureless continuous manufacturing method is apt to cause warp and twisting defects.
The present invention has been made in view of the above-mentioned problems in the prior art, and an object of the present invention is to provide a laminated plate which does not warp or twist by a pressureless continuous manufacturing method.

[0004]

According to the present invention, a long base material having both ends impregnated with a solvent is provided with a long metal foil on the upper surface and / or the lower surface of a required number of resin-impregnated long resin impregnated base materials. Due to the method for producing a laminated plate, which is characterized by continuously laminating and forming a laminated long laminated body without pressure, and cutting it to a required size, the laminated body is laminated into a laminated body without the lower surface sticking. Therefore, it is possible to obtain a laminated plate free from warpage and twist. The present invention will be described in detail below.

The long base material used in the present invention includes inorganic fibers such as glass, ceramics and asbestos, and vinyl alcohol.
Polyimide, polyethylene terephthalate, polybutylene terephthalate, polyamide, polyphenylene sulphide, polyphenylene oxide, woven cloth, non-woven cloth, paper, etc. made of organic fibers such as fluororesin and natural fibers such as cotton. Water, methyl alcohol, ethyl alcohol, acetone, styrene monomer on both ends of the material,
It is necessary to impregnate a solvent such as ethylene glycol by coating, spraying, transferring or the like. Coating width is 0.5-10c
m is preferred. That is, if it is less than 0.5 cm, the resin tends to flow out from both ends of the resin-impregnated base material, and if it exceeds 10 cm, the base material loss tends to increase. The base material may be woven cloth, non-woven cloth, or paper, and the constituent position thereof may be, for example, a composite structure in which the core portion is made of glass non-woven fabric and the surface portion is made of glass cloth. As the resin with which the base material is impregnated, an unsaturated polyester resin, a phenol resin, an epoxy resin, a diallyl phthalate resin, a vinyl ester resin (also referred to as an epoxy acrylate resin) single resin, a modified resin, or a mixed resin is used. Talc, clay, calcium carbonate, aluminum hydroxide
Inorganic powder fillers such as silica and silica, and fibrous fillers such as glass fibers, asbestos fibers, pulp fibers, synthetic fibers and ceramic fibers can be added. Furthermore, the impregnating resin may be impregnated with the same resin only,
The secondary impregnation may be a low-viscosity resin, and the secondary impregnation may be a high-viscosity resin.
Multiple impregnations such as secondary impregnation and secondary impregnation may be performed to make the impregnation more uniform. Thus, the long resin-impregnated base material is obtained by impregnating the long base material with both ends impregnated with the solvent by any means such as single-sided impregnation or full surface impregnation, but the solvent-impregnated portion is not impregnated with the resin. Alternatively, even if impregnated, the resin content becomes small, and no sticking occurs at the time of transferring the laminated body, so that internal strain is not generated in the laminated plate. The required number of long resin-impregnated base materials can be used according to the required thickness of the laminated plate. As the long metal foil, a single, alloy, or composite foil of copper, aluminum, brass, nickel, iron or the like is used, and an adhesive layer can be provided on one side of the metal foil if necessary. Thus, the long-sized laminated body obtained by laminating the long-sized metal foil on the upper surface and / or the lower surface of the long-sized resin-impregnated base material is laminated and molded without pressure to obtain a laminated plate. In the pressureless lamination molding integration of the long laminate, the curing time and the curing temperature can be selected depending on the resin, the base material, the thickness, etc., but the curing temperature is 130 to 20.
It is preferably 0 ° C. After the laminated molding, the laminated plate is obtained by cutting it to a required size with a cutter or the like. After cutting, the appearance can be further improved by reheating or rapid cooling if necessary. It is desirable to reheat above the glass transition point (Tg) of the resin, and the quenching after reheating is to put in low temperature water, liquid such as alcohol, or low temperature gas to quench, and 25 ° C or less. It is preferable to put it in water. The present invention will be described below based on examples.

[0006]

[Example] After impregnating each 2 cm width of both ends of a glass non-woven fabric having a thickness of 1 mm and a width of 105 cm with a styrene monomer,
Vinyl ester resin containing 20% by weight of talc (hereinafter simply referred to as "%" (manufactured by Showa Polymer Co., Ltd., product number R806-D)
A) a long vinyl ester resin-impregnated glass non-woven fabric substrate impregnated with a resin amount of 45%,
After impregnating each 2 cm width of both ends of a long glass woven cloth having a thickness of 0.15 mm and a width of 105 cm with a styrene monomer, a vinyl ester resin (manufactured by Showa Polymer Co., Ltd., product number R80
6-DA) was impregnated so that the resin amount was 45%, and two long vinyl ester resin-impregnated glass woven fabric base materials were respectively transferred, and then laminated, and the upper and lower surfaces thereof had a width of 105c.
m, 0.035 mm thick copper foil laminated long laminate continuously without pressure at 170 ° C. for 20 minutes, then cut into 100 cm square with a cutter to have a thickness of 1.2 mm.
The laminated plate of was obtained continuously.

[0007]

Comparative Example A laminated plate having a thickness of 1.2 mm was continuously obtained by the same process as in Example except that both ends of each substrate were not impregnated with styrene monomer.

Table 1 shows the warp and twist of the laminated plates of the examples and comparative examples.

[0009]

[Table 1]

[0010]

The present invention is constructed as described above. In the method for manufacturing a laminated plate having the structure described in the claims, it was confirmed that the obtained laminated plate was able to greatly reduce warpage and twist, and that the present invention was excellent.

Claims (2)

[Claims] 1. A continuous laminate in which a long metal foil is laminated on the upper surface and / or the lower surface of a required number of resin-impregnated long resin-impregnated base materials, which are continuously impregnated with a solvent at both ends. A method for manufacturing a laminated plate, which comprises laminating and forming without pressure, and then cutting to a required size. 2. The method for producing a laminated plate according to claim 1, wherein the solvent impregnation widths are each 0.5 to 10 cm.