JPH0592437A - Production of laminated sheet - Google Patents

Abstract

PURPOSE:To produce a laminated sheet reduced in warpage and distortion. CONSTITUTION:A resin-impregnated long fabric composed of twisted yarn wherein warp yarns and/or weft yarns are O-0.7 times/inch is arranged to the upper surface and/or rear surface of a resin impregnated long nonwoven fabric and a long metal foil is further arranged to the fabric as the outermost layer to form a long laminate. The long laminates are continuously laminated to be molded and the molded one is cut into a required dimension and the cut laminate is reheated and subsequently quenched 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, since a laminated sheet is made of a woven fabric using warped yarns and weft yarns with a twisted yarn of about 1 time / inch, internal strain generated when twisting the yarn causes heat and tensile force to the laminated sheet. When an external force such as the above is applied, the twist of the yarn causes warp and twist in the same direction as the untwisting direction, so that it is inevitable that the laminate has some warp and twist. However, when a laminated board is processed into a printed wiring board or when an electric component or the like is mounted on the printed wiring board, warpage or twisting makes it difficult to process, which is a major cause of reduced productivity.

[0003]

As described in the prior art, it has been unavoidable that the conventional laminated plate is warped or twisted. 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 method for manufacturing a laminate without warpage or twist.

[0004]

According to the present invention, warp yarns and / or weft yarns are provided on the upper surface and / or lower surface of a resin-impregnated long nonwoven fabric in an amount of 0 to 50%.
A long woven fabric in which a resin-impregnated long woven fabric made of twisted yarn of 0.7 times / inch is arranged, and a long metal foil is further provided as the outermost layer is continuously laminated and formed, and then cut to a required size. Then, after the reheating, because of the method for manufacturing a laminate characterized by further rapid cooling, it was possible to achieve the above objects,
The present invention will be described in detail below.

The non-woven fabric of the resin-impregnated non-woven fabric used in the present invention includes inorganic fibers such as glass, ceramics and asbestos, vinyl alcohol, polyimide, polyethylene terephthalate, polybutylene terephthalate, polyamide, polyphenylene sulfide, polyphenylene oxide. , A non-woven fabric made of organic fibers such as fluororesin and natural fibers such as cotton. As the resin to be impregnated into the non-woven fabric, phenol, epoxy, unsaturated polyester, polyimide, polyamide, polyphenylene oxide, polyphenylene sulfide, polybutadiene, fluororesin, etc. alone, modified products, mixtures are used, and are required. 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. Further, the resin may be impregnated only with the same resin, but a plurality of impregnations such as primary impregnation and secondary impregnation with the same type resin or different type resin may be performed to make the impregnation more uniform. Thus, the nonwoven fabric is impregnated with the resin and then dried by heating or the like, if necessary, to obtain a resin-impregnated nonwoven fabric. The required number of resin-impregnated nonwoven fabrics can be used as needed. As the resin-impregnated woven fabric, it is necessary to use a woven fabric in which warp and / or weft are twisted yarns of 0 to 0.7 times / inch. That is, twisting exceeding 0.7 turns / inch causes warping and twisting. As the material of the woven fabric, the one used in the above non-woven fabric is used in the same manner, and the resin used in the non-woven fabric is also used in the same manner as the impregnated resin. I will get it. The required number of resin-impregnated woven fabrics can be used as needed. As the 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 resin-impregnated woven fabric is arranged on the upper surface and / or the lower surface of the resin-impregnated non-woven fabric, and the metal foil is further arranged and formed as the outermost layer to obtain a laminated plate. The long laminate can be integrated by selecting the curing time, curing temperature, and molding pressure depending on the resin, base material, thickness, etc., but continuous such as pressureless continuous method, double belt molding method, multi-roll method, etc. It must be a construction method. .. After lamination molding, it is necessary to reheat after cutting to a required size with a cutter or the like. Reheating is preferably performed at a temperature higher than the heat distortion temperature of the resin. The rapid cooling after reheating is carried out by putting it in low temperature water, a liquid such as alcohol, or a low temperature gas to quench it, but it is preferable to put it in water at 25 ° C. or lower.

The present invention will be described below based on examples.

[0007]

[Example 1] A long epoxy material obtained by impregnating a glass non-woven fabric having a thickness of 1 mm and a width of 105 cm with a curing agent-containing epoxy resin containing 20% by weight of talc (hereinafter simply referred to as "%") so that the resin amount becomes 45%. One resin-impregnated glass nonwoven fabric prepreg has 44 warps / inch and 3 wefts on the upper and lower surfaces.
2 threads / inch, 0.4 warp and weft twists
A long glass woven cloth having a thickness of 0.15 mm and a width of 105 cm of times / inch is impregnated with a curing agent-containing epoxy resin so that the resin amount is 45%, and dried, and two pieces of long epoxy resin-impregnated glass woven cloth prepreg are used. And a long laminated body in which a long copper foil having a width of 105 cm and a thickness of 0.018 mm is arranged on the upper and lower surfaces thereof is sent to a double belt molding machine, and a molding pressure of 10
Kg / cm ² at 165 ° C. for 10 minutes continuously under heat and pressure molding, then cut into 100 cm square with a cutter, then 140
After reheating at 30 ° C. for 30 minutes, it was put into water at 20 ° C. and rapidly cooled to obtain a laminated plate having a thickness of 1.2 mm continuously.

[0008]

Example 2 An unsaturated polyester resin was used as an impregnating resin, and the same process as in Example 1 was carried out except that the impregnated resin was laminated without being dried at 165 ° C. for 20 minutes without drying. Laminates were obtained continuously.

[0009]

Comparative Example 1 A laminated glass sheet having a thickness of 1.2 mm was prepared in the same manner as in Example 1 except that a long glass woven fabric having a warp and weft twist of 1 twist / inch was used and was not reheated or rapidly cooled. Obtained continuously.

[0010]

[Comparative Example 2] A laminated glass sheet having a thickness of 1.2 mm was prepared in the same manner as in Example 2 except that a long glass woven fabric in which the warp and weft were twisted once / inch was used and the heating and quenching were not performed. Obtained continuously.

The performance of the laminates of Examples 1 and 2 and Comparative Examples 1 and 2 are shown in Table 1. The test piece size of the amount of warpage was 400 × 250 mm, and after the copper foil circuit having the front and back copper foil residual ratio of 65% to 25% was created, the maximum lifting amount was measured on the surface plate with 12 samples.

[0012]

The present invention is constructed as described above. In the method for producing a laminated plate having the structure described in the claims, the amount of warpage of the obtained laminated plate can be significantly reduced, and it was confirmed that the present invention is excellent.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification number Internal reference number FI Technical display location // B29K 105: 08 (72) Inventor Hideshi Makino 1048 Kadoma, Kadoma-shi, Osaka Matsushita Electric Works Co., Ltd. In the company

Claims (1)

[Claims] 1. A resin-impregnated long woven fabric comprising warp yarns and / or weft yarns with twisted yarns of 0 to 0.7 times / inch is arranged on the upper surface and / or lower surface of the resin-impregnated long nonwoven fabric, and the longest fabric is further used as the outermost layer. A method for producing a laminated plate, which comprises continuously laminating and molding a long laminated body provided with a metal foil, cutting it to a required size, reheating, and then rapidly cooling.