JPH05185553A - Production of laminated sheet - Google Patents

Abstract

PURPOSE:To produce a laminated sheet reduced in warpage and distortion. CONSTITUTION:A vinylester resin impregnated long fabric having warp yarns whose twist direction is composed of a mutually reverse combination is arranged on the upper and rear surfaces of a vinylester resin impregnated long nonwoven fabric and a long metal foil is further arranged to the outermost layers thereof to form each of long laminates. The long laminates thus formed are continuously laminated and molded to be cut into a required dimension.

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 vinyl ester resin-impregnated long woven fabric composed of a combination of warp yarns in which the twist directions are forward and reverse is arranged on the upper surface and / or the lower surface of a vinyl ester resin-impregnated long nonwoven fabric, Further, a long laminate having a long metal foil as an outermost layer is continuously laminated and formed, and a method for producing a laminate characterized by cutting to a required size can achieve the above object. Now, the present invention will be described in detail.

The non-woven fabric of the vinyl ester 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,
It is a non-woven fabric made of organic fibers such as polyamide, polyphenylene sulfide, polyphenylene oxide, and fluororesin, and natural fibers such as cotton. As the resin with which the non-woven fabric is impregnated, a vinyl ester resin (also referred to as an epoxy acrylate resin), a vinyl ester resin modified with rubber or the like, or a vinyl ester resin mixture with an unsaturated polyester resin or the like is used. Inorganic powder fillers such as talc, clay, calcium carbonate, aluminum hydroxide and silica, and fibrous fillers such as glass fibers, asbestos fibers, pulp fibers, synthetic fibers and ceramic fibers can be added. Further, the vinyl ester resin may be impregnated only with the same resin, but the primary impregnation with the same resin may be a low-viscosity resin and the secondary impregnation may be an impregnation with a higher-viscosity resin. Multiple impregnations such as secondary impregnation and secondary impregnation may be performed to make the impregnation more uniform. Thus, the non-woven fabric is impregnated with the vinyl ester resin and then dried by heating or the like, if necessary, to obtain a non-woven fabric impregnated with the vinyl ester resin. The required number of vinyl ester resin-impregnated non-woven fabrics can be used as needed. As the vinyl ester resin-impregnated woven fabric, it is necessary to use a woven fabric in which warp yarns are twisted in the forward and reverse directions. By doing so, warpage and twist of the laminated plate can be reduced. As the material of the woven fabric, those used for the above non-woven fabric are similarly used, and for the impregnated vinyl ester resin, those used for the above non-woven fabric are also used, and the vinyl ester resin is dried by heating or the like as necessary. This is to obtain an impregnated woven fabric. The required number of vinyl ester resin-impregnated woven fabrics can be used as needed. As the metal foil, copper, aluminum, brass, nickel, iron or the like alone, an alloy or a composite foil is used, and an adhesive layer can be provided on one side of the metal foil if necessary. Thus, the vinyl ester resin-impregnated woven fabric is arranged on the upper surface and / or the lower surface of the vinyl ester 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 the laminated molding, the laminated plate is obtained by cutting it to a required size with a cutter or the like.

The present invention will be described below based on examples.

[0007]

Example 1 A vinyl ester resin (manufactured by Showa Polymer Co., Ltd., product number R806) containing 20% by weight (hereinafter simply referred to as%) of talc in a glass non-woven fabric having a thickness of 1 mm and a width of 105 cm.
-DA) impregnated with a resin amount of 45% and dried, long vinyl ester resin impregnated glass nonwoven fabric prepreg 1
44 warps / inch, 32 wefts / upper and lower surfaces
A vinyl ester resin (manufactured by Showa Highpolymer Co., Ltd., product number R806-DA) is applied to a long glass woven cloth having a thickness of 0.15 mm and a width of 105 cm, which is a combination of the warp yarns having the twisting directions of forward and reverse. Of glass woven fabric prepreg impregnated and dried so as to have a width of 45%.
cm, thickness 0.018 mm long copper foil is placed on the long laminate to a double belt molding machine, molding pressure 10 Kg /
cm ² at 100 ° C. for 10 minutes continuously under heat and pressure molding,
After heating at 180 ° C for 30 minutes, use a cutter for 100 cm
It was cut into squares to continuously obtain a laminated plate having a thickness of 1.2 mm.

[0008]

Example 2 The same procedure as in Example 1 was carried out except that the resin-impregnated base material was not dried after impregnation, laminated as it was at 100 ° C. for 20 minutes without pressure, and further cut at after heating at 180 ° C. for 30 minutes. And a laminated plate having a thickness of 1.2 mm was continuously obtained.

[0009]

[Comparative Example 1] A laminated plate having a thickness of 1.2 mm was continuously obtained by the same process as in Example 1 except that a long glass woven fabric having a warp and weft twist of 1 twist / inch was used. .

[0010]

[Comparative Example 2] A laminated plate having a thickness of 1.2 mm was continuously obtained in the same manner as in Example 2 except that a long glass woven fabric having a warp and weft twist of 1 twist / inch was used. .

The performance of the laminates of Examples 1 and 2 and Comparative Examples 1 and 2 are shown in Table 1.

[0012]

[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.

[0013]

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: 10 (72) Inventor Hideshi Makino 1048, Kadoma, Kadoma-shi, Osaka Matsushita Electric Works Co., Ltd.

Claims (1)

[Claims] 1. A vinyl ester 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 vinyl ester resin impregnated long nonwoven fabric, and a long metal foil is further provided as an outermost layer. A method for producing a laminated plate, which comprises continuously laminating and molding a long laminate having the above-mentioned arrangement, and then cutting the laminate to a required size.