JPH05478A - Laminated sheet and manufacture of laminated sheet - Google Patents

Abstract

PURPOSE:To provide a laminated sheet having no warpage and twist and a process for producing the same in order to eliminate warpage and twist which can not be eliminated in conventional laminated sheets. CONSTITUTION:The title laminated sheet is produced by a method wherein a metallic foil is disposed on and formed unitarily with the upper face and/or the lower face of a laminate composed of the required number of sheets of a resin-impregnated base material made of a woven cloth comprising warps whose twisted directions are in a forward and backward combination, and also by a method wherein the required number of sheets of a resin-impregnated elongated base material made of an elongated woven cloth comprising warps whose twisted directions are in a forward and backward combination is superposed on one another to form an elongated laminate, and the resultant elongated laminate further provided with an elongated metallic foil on the upper face and/or the lower face thereof is, after continuous laminate molding, cut into a required size.

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 laminated board used for a computer, a communication device, etc., and a method for manufacturing the same.

[0002]

2. Description of the Related Art Conventionally, since a laminated plate is made of a woven fabric using warped yarns and weft yarns with twisted yarn of about 1 time / inch, internal strain caused when the yarn is twisted is caused by heat and tensile force. When an external force such as the above is applied, the twist of the yarn causes a 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 the 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 perform processing, which is a major cause of reduction in 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 problems in the prior art, and an object of the present invention is to provide a laminated plate having no warp or twist and a manufacturing method thereof.

[0004]

According to the present invention, a metal foil is provided on the upper surface and / or the lower surface of a required number of resin-impregnated base materials using a woven fabric composed of a combination of warp yarns in which the twist directions are normal and reverse. The required number of long resin-impregnated base materials using a laminated board characterized by being formed into a body, and a long woven cloth composed of a combination of warp yarns in which the twisting directions are opposite to each other, A long laminated body provided with a lengthy metal foil is continuously laminated and formed, and then a laminated plate is manufactured by cutting to a required size. Therefore, the above object can be achieved. Hereinafter, the present invention will be described in detail.

The resin-impregnated base material used in the present invention is a glass which is composed of a combination of warp yarns in which the twist directions are normal and reverse,
It is a woven fabric composed of inorganic fibers such as asbestos, organic fibers such as vinyl alcohol, polyimide, polyphenylene sulfide, polyphenylene oxide and fluororesin, and natural fibers such as cotton. As the resin to be impregnated into the substrate, phenol, epoxy, unsaturated polyester, polyimide, polyamide, polyphenylene oxide, polyphenylene sulfide, fluororesin, etc. alone, modified products, mixtures are used, if necessary. Depending on talc, clay,
Inorganic powder fillers such as 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 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, after impregnating the base material with the resin, it is dried by heating or the like, if necessary, to obtain a resin-impregnated base material. As the metal foil, copper, aluminum,
A single material such as brass, nickel, iron or the like, an alloy, or a composite foil is used, and an adhesive layer can be provided on one side of the metal foil if necessary. The conditions of integration are resin, base material, thickness, etc.
The curing time, curing temperature and molding pressure can be selected, but it is necessary that the continuous method such as a pressureless continuous method, a double belt molding method and a multi-roll method be used. . 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 long glass woven cloth having a thickness of 0.15 mm and a width of 105 cm, which is a combination of warp yarns having a yarn density of 44 yarns / inch and weft yarns having a yarn yarn density of 32 yarns / inch, and the twist directions of the warp yarns are opposite to each other. 4 pieces of long epoxy resin-impregnated glass woven cloth prepreg impregnated with the resin so that the resin amount becomes 45% by weight, and a long copper foil having a width of 105 cm and a thickness of 0.018 mm is further arranged on the upper and lower surfaces thereof. The long laminate provided is sent to a double belt molding machine and the molding pressure is 10 Kg / cm ² , 1
After continuously heat-pressing and molding at 65 ° C. for 10 minutes, a cutter was cut into 100 cm square pieces to continuously produce a laminated plate having a thickness of 0.8 mm.

[0008]

Example 2 An unsaturated polyester resin was used as the 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 manufactured continuously.

[0009]

[Comparative Example 1] The same procedure as in Example 1 was carried out except that a long glass woven fabric having a thickness of 0.15 mm and a width of 105 cm made of a combination in which the twist directions of the warps were the same was used and the thickness was 0.8 m.
m laminates were produced continuously.

[0010]

[Comparative Example 2] The same procedure as in Example 2 was carried out except that a long glass woven fabric having a thickness of 0.15 mm and a width of 105 cm, which was made of the same combination of warp twist directions, was used, and the thickness was 0.8 m.
m laminates were produced 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 warp amount is 400 × 250 mm, and after forming the copper foil circuit with the front and back copper foil residual ratio of 65% -25%,
The maximum lifting amount was measured with 12 samples on the surface plate.

[0012]

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

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Hideshi Makino             1048, Kadoma, Kadoma-shi, Osaka Matsushita Electric Works Co., Ltd.             Inside the company

Claims (2)

[Claims] 1. A metal foil is disposed on the upper surface and / or the lower surface of a required number of resin-impregnated base materials using a woven fabric in which warp yarns are twisted in the forward and reverse directions. Laminated board. 2. A length obtained by stacking a required number of long resin-impregnated base materials using a long woven fabric composed of a combination of warp yarns in the forward and reverse directions, and further disposing a long metal foil on the upper surface and / or the lower surface thereof. A method for producing a laminated plate, which comprises continuously laminating and molding a lengthwise laminated body, and then cutting the laminated body to a required size.