JPH05482A - Preparation of laminated sheet - Google Patents

Abstract

PURPOSE:To provide a method for preparation of a laminated sheet having no warpage and twist as it is impossible to eliminate warpage and twist in the conventional laminated sheet. CONSTITUTION:A longer laminated body wherein required number of sheets of a longer resin-impregnated base material wherein a longer woven fabric consisting of a warp and a weft both with a twist of 0-0.7 times/inch is used are laminated and longer metal foils are additionally placed on the upper and/or the lower surface, are continuously laminated and molded and then cut into a required dimension and the cut sheets are heated again.

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 required number of long resin-impregnated substrates using a long woven fabric in which warp yarns and / or weft yarns are composed of twisted yarns of 0 to 0.7 times / inch are stacked. A long laminated body in which a long metal foil is arranged on the upper surface and / or the lower surface,
Since the method for producing a laminated plate is characterized in that after continuously laminating and molding, it is cut to a required size and then reheated. Therefore, the above object can be achieved, and the present invention will be described in detail below. To do.

The resin-impregnated base material used in the present invention comprises inorganic fibers such as glass and asbestos, which are twisted yarns having warp and / or weft of 0 to 0.7 times / inch as the base material, vinyl alcohol, polyimide and polyphenylene. Rensulf Eyed,
A long woven fabric made of organic fibers such as 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. Accordingly, 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 may be added. it can. 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. Copper as the metal foil,
Aluminium, brass, nickel, iron etc. alone, alloy,
A composite foil is used, and an adhesive layer can be provided on one side of the metal foil if necessary. The integration conditions are resin, base material, thickness, etc., and the curing time, curing temperature, and molding pressure can be selected, but continuous methods such as pressureless continuous method, double belt molding method, and multi-roll method are available. It is necessary. .. 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 glass woven cloth having a yarn density of 44 warps / inch and weft threads of 32 / inch, a warp and weft twist count of 0.3 / inch, a thickness of 0.15 mm, and a width of 105 cm. 4 pieces of long epoxy resin-impregnated glass woven cloth prepreg impregnated with epoxy resin so that the resin amount becomes 45% by weight, and further, the upper and lower surfaces of the long copper having a width of 105 cm and a thickness of 0.018 mm. The long laminate provided with the foil is sent to a double-belt molding machine and the molding pressure is 10 kg / cm ² , 1
After continuously heat-press molding at 65 ° C. for 10 minutes, it was cut into 100 cm square with a cutter, and then reheated at 140 ° C. for 30 minutes to continuously produce a laminated plate having a thickness of 0.8 mm.

[0008]

Example 2 A long glass woven cloth having a yarn density of 44 warps / inch and weft threads of 32 / inch, a warp and weft twist count of 0.7 / inch, a thickness of 0.15 mm, and a width of 105 cm. , Using an unsaturated polyester resin as the impregnating resin,
After the impregnation, it was dried without being dried, and was processed in the same manner as in Example 1 except that it was laminated at 165 ° C. for 20 minutes under no pressure to obtain a thickness of 0.
8 mm laminates were manufactured continuously.

[0009]

[Comparative Example 1] Long glass woven cloth having a yarn density of 44 warps / inch and weft threads of 32 / inch, a warp and weft twist count of 1.0 / inch, a thickness of 0.15 mm and a width of 105 cm. Was used and treated in the same manner as in Example 1 except that reheating was not carried out, and a laminated plate having a thickness of 0.8 mm was continuously manufactured.

[0010]

[Comparative Example 2] Long glass woven fabric having a yarn density of 44 warps / inch and weft threads of 32 / inch, a warp and weft twist count of 1.0 / inch, a thickness of 0.15 mm and a width of 105 cm. Was used and treated in the same manner as in Example 2 except that reheating was not performed, and a laminated plate having a thickness of 0.8 mm was continuously manufactured.

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 in which the front and back copper foil residual rate is 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.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification number Reference number within the agency FI Technical display location H05K 1/03 G 7011-4E (72) Inventor Hideshi Makino 1048 Kadoma, Kadoma, Osaka Prefecture Matsushita Electric Works Stock company

Claims (1)

Claims: 1. A required number of long resin-impregnated bases made of a long woven fabric in which warp and / or weft are made of twisted yarn of 0 to 0.7 times / inch, and the upper surface and Alternatively, a method for producing a laminated plate is characterized in that a long laminated body having a long metal foil disposed on the lower surface is continuously laminated, cut into a required size, and then reheated.