JPH0592438A - Production of laminated sheet - Google Patents

Abstract

PURPOSE:To reduce the warpage quantity of a laminated sheet to a large extent by a method wherein a resin impregnated long nonwoven fabric wherein the twist directions of warp yarns are combined regularly and reversely is arranged to the upper surface and/or rear surface of a resin impregnated long nonwoven fabric and a long laminate is further continuously laminated to the nonwoven fabric as the outermost layer and the formed laminate is cut and reheated. CONSTITUTION:A glass nonwoven fabric is impregnated with a curing agent- containing epoxy resin containing a talc and the impregnated fabric is dried to form a long epoxy resin impregnated glass nonwoven fabric prepreg. A long glass fabric wherein the yarn density of warp yarns is about 44/inch, that of weft yarns is about 32/inch and the twist directions of warp yarns are combined regularly and reversely is impregnated with a curing agent--containing epoxy resin. The dried long epoxy resin impregnated glass fabric prepregs are superposed on the resin impregnated glass fabric and long copper foils are further arranged to the upper and rear surfaces thereof to form a long laminate which is, in turn, fed to a double belt molding machine to be continuously molded under heating using predetermined molding pressure. The molded laminate is cut and reheated to continuously obtain 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, a resin-impregnated long woven fabric composed of a combination of warp yarns in which the twist directions are normal and reverse is arranged on the upper surface and / or the lower surface of a resin-impregnated long nonwoven fabric, and the outermost layer is further provided. The above object is achieved for a method for manufacturing a laminated plate, which comprises laminating a long metal foil provided with a long metal foil continuously, cutting it to a required size, and then reheating it. 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 the twist directions of the warp yarns are a combination of forward and reverse directions. That is, by doing so, warpage and twist of the laminated plate can be reduced. 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.
The metal foil is copper, aluminum, brass, nickel,
A single metal such as iron, an alloy, or a composite foil is used, and an adhesive layer can be provided on one surface 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 present invention will be described below based on examples.

[0007]

[Example 1] A long epoxy material obtained by impregnating a glass nonwoven 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.
A long glass woven cloth having a thickness of 0.15 mm and a width of 105 cm, which has a yarn density of 2 threads / inch and the twist directions of the warp threads are forward and reverse, and the amount of the epoxy resin containing the curing agent is 45%.
A long laminate in which two long epoxy resin-impregnated glass woven fabric prepregs each having a width of 105 cm and a thickness of 0.018 mm are arranged on the upper and lower surfaces of the laminated prepreg. Sent to the double belt molding machine, molding pressure 1
After continuously heat and pressure molding at 0 Kg / cm ² and 165 ° C. for 10 minutes, cut into 100 cm square with a cutter, then
It was reheated at 0 ° C. for 30 minutes to continuously obtain a laminated plate having a thickness of 1.2 mm.

[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 long glass woven fabric having a thickness of 0.15 mm and a width of 105 cm formed of a combination having the same twist direction of warp was used, and treated in the same manner as in Example 1 except that it was not reheated, and a thickness of 1. A 2 mm laminated plate was continuously obtained.

[0010]

[Comparative Example 2] A long glass woven fabric having a thickness of 0.15 mm and a width of 105 cm formed of a combination having the same twist direction of the warp was used and treated in the same manner as in Example 2 except that it was not reheated. A 2 mm laminated plate was continuously obtained.

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 H05K 1/03 H 7011-4E // B29K 105: 08 (72) Inventor Hideshi Makino Kadoma City, Osaka Prefecture 1048, Kadoma, Matsushita Electric Works Co., Ltd.

Claims (1)

[Claims] 1. A resin-impregnated long woven fabric composed of a combination of warp yarns in which the twist directions are normal and reverse is arranged on the upper surface and / or the lower surface of a resin-impregnated long nonwoven fabric, and a long metal foil is further arranged as an outermost layer. A method for producing a laminated plate, comprising continuously laminating and molding a long laminate, cutting the laminate to a required size, and then reheating the laminate.