JPH03126552A - Manufacture of laminated board - Google Patents

Abstract

PURPOSE:To obtain a laminated board, in which warpage is hardly generated, by a method wherein a long-sized beltlike laminate in which a requied number of long- sized resin-impregnated ceramic fiber cloth are laminated and long-sized metallic foils are disposed onto the top face and/or underside of the laminated ceramic fiber cloth and laminated is cured transferred continuously, cut in a necessary size, heated at a thermal deformation temperature or higher and cooled at the thermal deformation temperature or lower. CONSTITUTION:Four long-sized resin-impregnated cloth 1 in which long-sized ceramic fiber cloth is impregnated with an unsaturated polyester resin containing benzoyl peroxide decompressed are passed between vertically arranged squeegee rolls 2, and the quantity of the resin is adjusted at 50wt.%. A long-sized beltlike laminate 6 in which the resin-impregnated cloth 1 is laminated simultaneously while resin reservoirs 3 are generated among the resin-impregnated cloth 1 and the squeegee rolls 2 and the adhesive sides of copper foils 4 with adhesives are opposed and disposed to the resin-impregnated cloth on the top face and underside of the laminated resin- impregnated cloth 1 and laminated by laminating rolls 5 is forwarded to a curing oven 7, and heated and cured under non-pressure. A cured material is cut by a cutter 8 in a specified size, heated at a thermal deformation temperature or higher by a heating oven 9, and cooled at the thermal deformation temperature or lower.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a method for manufacturing a laminate used in electronic equipment, electrical equipment, computers, communication equipment, and the like.

[Conventional technology]

Conventionally, laminates used for electrical equipment, etc. are obtained by heating and pressing a laminate made of resin-impregnated paper, resin-impregnated glass cloth, etc. and metal foil for a long time of 11 to 2 hours using a multistage press. As a result, molding distortion remains in the laminate, causing warping due to the heat generated when processing the laminate into a printed wiring board or mounting electronic components on the printed wiring board, causing problems in automated processes. was there. This tendency was particularly strong for ceramic fiber cloth base materials that satisfy high frequency characteristics.

[Problem that the invention seeks to solve]

As described in the related art section, the laminate obtained by the multi-stage press method warps during the processing process.

The present invention has been made in view of the above-mentioned problems in the prior art, and its object is to provide a method for manufacturing a hollowed Ceramic m-fiber base laminate that does not cause warping.

[Means for solving problems]

The present invention uses a required number of long resin-impregnated ceramic fiber cloths,
After laminating through the squeeze rolls placed above and below,
A long strip-shaped laminate is cast and laminated with a long gold rice foil on its upper and/or lower surfaces, and after curing while continuously transferring, n
Since the laminate manufacturing method is characterized by cutting into required dimensions, heating above the heat distortion temperature, and cooling below the heat distortion temperature, residual strain is generated in the laminate without applying pressure. The present invention will now be described in detail.

Long resin-impregnated ceramic fiber cloth used in the present invention? Toshi is made of ceramic 11i fabric made of quartz, alumina, boron nitride, etc., phenol resin, epoxy resin,
It is impregnated with unsaturated polyester resin, diallyl phthalate resin, vinyl ester resin, epoxy acrylate resin, polyimide 4 resin, polyphenylene V oxide resin, fluororesin, etc. alone, modified products, and mixtures, and the resin impregnation is the same type of resin. Impregnation may be done only by A, but primary and secondary impregnation with a different type of resin may also be used, or multiple impregnations may be carried out, such as primary impregnation with a low viscosity resin and secondary impregnation with a higher viscosity resin than the primary impregnation. You can also do this to achieve more uniform impregnation. A curing agent, a crosslinking agent, a polymerization initiator, a 7-mer diluent, a filler, a reinforcing agent, etc. can be added to the resin as necessary. Furthermore, although the above resin may be used as it is, it is preferable to use it after defoaming under reduced pressure, in order to suppress the generation of bubbles in the resin-impregnated cloth. As the metal foil, single, alloy, or composite foils of copper, aluminum, iron, nickel, zinc, etc. are used, and if necessary, an adhesive layer can be provided on one side of the metal foil to further improve adhesion. can. The squeeze roll may be made of metal, rubber, synthetic resin, or a metal roll whose surface is lined with rubber or synthetic resin. During lamination, it is preferable to generate a resin pool between the squeeze roll and the resin-impregnated cloth to avoid generating air bubbles in the resin-impregnated cloth. The curing temperature and curing time for curing the long strip-shaped laminate can be selected depending on the type of resin, but it is important that the curing is done without pressure.

For heating and cooling after cutting, there is no particular limitation as long as the temperature can be lowered or higher than the heat deformation temperature of the resin used, but for cooling, it is desirable that the temperature can be rapidly cooled.Hereinafter, the present invention One embodiment of the present invention will be explained as follows based on the illustrated embodiment.

Example 91 Figure 1 is a simplified process diagram showing an example of the method for manufacturing a laminate of the present invention.

Figure 1 As shown, a long ceramic fiber cloth (manufactured by Sango Pan Co., Ltd., product number I18) with a width of 1050 m and a thickness of 0.2 fins is impregnated with unsaturated polyester resin containing benzoyl peroxide that has been depressurized. 50 layers of resin jIk are passed between 2 squeeze rolls with 4 sheets of resin-impregnated cloth 1 placed above and below! I
At the same time, while creating a resin pool 3 between the resin-impregnated cloth 1 and the squeeze roll 2, after laminating, the adhesive side of the adhesive-coated copper foil 4 with a thickness of 0.035mm is impregnated with resin on the upper and lower surfaces. A long strip-shaped laminate 6 placed facing the cloth and laminated with a laminating roll 5 was sent to a curing furnace 7 and cured by heating under no pressure. The heat distortion temperature of this cured product is 80
It was ℃. Next, the cured product was 1000 x 1000
After cutting with a force of 9 terres for each fi, it was heated to 85° C. in a heating furnace 9 and then rapidly cooled to 60° C. in a cooling furnace IO to obtain a double-sided steel clad laminate 11 with a thickness of 0.8H.

Comparative Example A prepreg obtained by impregnating the same ceramic fiber cloth as in the example with the same resin as in the example and drying it was prepared in a size of 10!50 x 105.
The same copper foil as in the example was cut to the same dimensions as above and arranged on the upper and lower surfaces of 4 sheets cut to 0 cod angle and placed on top and bottom, and heated and pressed at 145°C for 60 minutes at a molding pressure of 20 Kq/d. A double-sided copper-clad laminate with a thickness of g and B mm was obtained.

What is the performance of the laminates in Examples and Comparative Examples? It looks like Table 41.

〔Effect of the invention〕

The present invention is constructed as described above. The method for manufacturing a laminate having the structure described in the claims has the effect of producing a laminate with less warpage.

[Brief explanation of the drawing]

FIG. 1 is a simplified process diagram showing an embodiment of the method for manufacturing a laminate according to the present invention. 1 is a long resin-impregnated cloth, 2 is a squeeze roll, 3 is a resin reservoir, 4 is a copper foil, 5 is a laminate roll 6 is a long strip-shaped laminate, 7 is a curing furnace, 8 is a cutter 9 is a heating furnace, IO is a In the cooling furnace, 11 is a laminated plate.

Claims (1)

[Claims] (1) After laminating the required number of long resin-impregnated ceramic fiber cloths through squeeze rolls placed above and below, a long metal foil is placed on the upper and/or lower surfaces of the laminated long strip-shaped laminate. 1. A method for manufacturing a laminate, which comprises curing the laminate while continuously transferring it, cutting it into a required size, heating it above the heat distortion temperature, and cooling it below the heat distortion temperature.