JPS5942929A - Preparation of laminated board - Google Patents

Abstract

PURPOSE:To obtain the laminated board which is improved in the accuracy of thickness and is able to prevent the deviation of materials by such an arrangement wherein a prepreg is prepared by impregnating a base material with resin for laminated board and drying it, and the edges and side surfaces of the laminated body of the prepreg are coated with a quick drying material and caused to dry in advance, and the laminated body thus obtained is then formed by heating and pressing. CONSTITUTION:A prepreg is prepared by impregnating a base material for laminated board (e.g., natural fiber, etc.) with resin for laminated board (e.g., epoxy resin, etc.) and dried, and a laminated body is then prepared by laminating a required number of sheet of the prepreg and the edges and side surfaces of the laminated body are coated (thickness of 0.05-1mm. is most suitable) with a quick drying material (e.g., phenol resin, etc.) and dried in advance (time is preferably within 60min), and the titled laminated board is eventually obtained by heating, pressing and forming the laminated body by using a metal plate for metal mold. USE:For printed circuit board, etc.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing printed wiring boards (laminates such as laminates that require high dimensional stability), and its purpose is to improve thickness accuracy while manufacturing. This is to improve efficiency.

As shown in Fig. 1, a conventional laminate is made by impregnating a laminate base material with a laminate resin and laminating a required number of dried Buri Preg l sheets, then sandwiching the laminate a between metal mold plates 2 and heating it. Although pressure molding was performed, it was inevitable that the thickness accuracy would deteriorate due to the laminate resin 8 melting and flowing out from the Gripreg 1. Furthermore, there was also the drawback that the grip preg was easily misaligned during molding.

In the method of the present invention, a quick-drying material is applied in advance to the periphery and side surfaces of the laminate in which the required number of Glypregs are layered, and the resin for the laminate is Since melt outflow can be prevented by IF, thickness accuracy can be improved and misalignment of the prepreg can be prevented.

Next, the method of the present invention will be explained in detail. The resins for laminates used in the present invention are epoxy resins, phenol resins, unsaturated polyester resins, and melamine resins.

Thermosetting resins in general include polyimide resins, polybutadiene resins, etc. alone, mixtures, and modified products.

Base materials for laminates include natural fibers such as paper and cotton, polyamide, polyvinyl alcohol, and polyester.

These are woven fabrics, non-woven fabrics, and mats made of organic synthetic fibers such as polyacrylic, glass, and inorganic fibers such as Anuvest.

Quick-drying materials that are pre-applied to the periphery and side surfaces of the laminate and dried include phenolic resin, epoxy resin, unsaturated polynisder resin, melamine resin, polyurethane resin, polyimide resin, alkyd resin, Paints, varnishes, etc. made of silicone resins, 7-run resins, allyl resins, acrylic resins, nylon resins, polyvinyl resins alone, in mixtures, or modified products are used, and preferably quick-drying materials are dried for 1 hour at room temperature. , preferably within 60 minutes 1. stomach. That is, if the time exceeds 60 minutes, the work efficiency will decrease. The periphery and side surface portion are the periphery portion and the entire side surface area of 0.2 to 50 cm inward from the periphery of the body. Further, the coating thickness of the quick-drying material is not particularly limited, but is preferably 0.05 to 1M. That is, 0.
This is because if it is less than 0.05 μM, it will not be possible to prevent the resin from melting and flowing out, and if it exceeds 1M, the drying time will be delayed.

Next, the method of the present invention will be explained based on examples.

EXAMPLE An example of obtaining a laminate by the method of the present invention will be described below with reference to the drawings.

As shown in FIG.
! : E t ) resol type phenolic resin varnish contained in Kura 71 paper with Jk 0.11, I'V' made by layering 8 sheets of 1 Repreg 1 with a resin content of 45% and dried as Layer 3. Apply an acrylic coffin fat-based paint with a drying time of (9) minutes to the periphery and side parts of the 10-opening inward from the periphery so that the coating V becomes 021n, and dry. After that, place it between the mold metal plates 2 and apply a molding pressure of 100k7! , i, and laminated at 160° C. for 60 minutes to obtain a laminate with a thickness of 1.6 F. The thickness accuracy of one bond plate was within 1G±0.10, and there was no deviation of the prev V during molding, and the laminated body was integrated, so it was easy to handle.

Comparative example: filt 8, which is made by laminating 8 dereg legs that are the same as the large Mi example.
The thickness accuracy of the bond 11 plate with a thickness of 1.6 layers obtained by sandwiching the body between the metal plates for the -zt mold and processing in the same manner as in the example was 16.
±0.14zt*, and care was required to prevent the occurrence of slippage of the plastic plug during molding, resulting in poor manufacturing efficiency.

As described above, according to the method of the present invention, it was possible to achieve improvement in Jf, milling accuracy, and production efficiency, and it was confirmed that the method of the present invention is superior.

[Brief explanation of the drawing]

FIG. 1 is a schematic cross-sectional view of a single layered body formed by a conventional method, and FIG. 2 is a schematic cross-sectional view of a laminated body formed by the method of the present invention. 1... Delip leg, 2... Metal plate for mold, 8...
・Resin for RA laminates that flows out during welding, 4...1 bundle of drying material. Patent applicant: Matsu, Denko Co., Ltd., JJ, 1 patent attorney: Satoshi Takemoto (and 2 others) Figure 1 Figure 2

Claims (1)

[Scope of Claims] +11 For manufacturing a laminate by heating and press-molding an f front layer in which the required number of dried 7° repregs are laminated by impregnating the wings with trMJ resin for bond Rq boards and laminating the required number of dried 7° repregs. A method for producing a laminate, comprising applying a quick-drying material to the periphery and side surfaces of the laminate in advance, drying it, and then molding it under heat and pressure. (2) The method for producing a laminate according to claim 1, wherein the drying time of the quick-drying side slope is within 60 minutes at room temperature.