JPH0397545A - Manufacture of laminated sheet - Google Patents

Abstract

PURPOSE:To obtain a laminated sheet developing no warpage by a method wherein a long metal foil is superposed on the upper surface and/or lower surface of a required number of long resin impregnated fluoroplastic fiber fabrics and the laminated long strip like laminate is cured while transferred continuously to be cut into required dimensions. CONSTITUTION:As a long resin impregnated fluoroplastic fiber fabric 1, a fabric, a nonwoven fabric or paper of fluoroplastic fiber composed of tetrafluoroethylene resin impregnated with phenol resin, a modified one or a mixture thereof is used. As a metal foil 2, a single foil of copper, aluminium, iron, nickel or zinc, an alloy foil thereof or a composite foil is used. As a laminating roll 3, an arbitrary roll made of a metal, rubber or synthetic resin or a roll wherein the lining of rubber or synthetic resin is applied to the surface of a metal roll may be used. With respect to the curing of a long strip like laminate 4, curing temp. and a curing time can be selected according to the kind of resin but it is important to perform curing under pressure of 0-20 kg/cm<2>.

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, etc.

[Prior art] Conventionally, A-layer boards used for electrical equipment, etc. are made of laminated sheet metal multi-stage pressed metal made of resin-impregnated paper, resin-impregnated glass cloth, etc. and metal foil, and heated for a long time of 1 to 2 hours. Because it is a pressurized type, some distortion remains in the laminate, and warping occurs when processing the laminate into a printed wiring board or due to the extreme heat of mounting electronic components on the printed wiring board. There was a drawback that caused problems in the automated process. This tendency was particularly strong for fluororesin fiber cloth base laminates to 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 purpose is to prevent warping.
An object of the present invention is to provide a method for manufacturing a fluororesin fiber-based laminate.

[Means for solving problem books]

The present invention involves stacking a required number of long metal foils on the upper and/or lower surfaces of the long resin-impregnated fluororesin fiber cloth, and continuously transferring the laminated long strip-like laminate through laminating rolls arranged above and below. Since the laminate manufacturing method is characterized by cutting the laminate to the required size after curing, pressure is not required or can be minimized, so there is no residual strain in the laminate. The present invention will now be described in detail.

The long resin-containing fluorocarbon fiber cloth used in the present invention includes tetrafluoroethylene resin, tetrafluoroethylene barfluorovinyl ether copolymer, tetrafluoroethylene hexafluoropropylene copolymer, and tetrafluoroethylene Woven fabrics and non-woven fabrics of fluororesin fibers such as ethylene copolymers and trifluorochloroethylene resins,
For paper etc., phenol resin, epoxy vm resin, unsaturated polyester resin, diallyl phthalate resin, vinyl ester resin, epoxy acrylate resin, polyimide resin, polyphenylene oxide resin, fluororesin, etc. alone,
It is impregnated with a modified product or a mixture, and the resin impregnation may be performed only with the same type of resin, but it is also possible to impregnate with a different type of resin for the first or second time.
A secondary impregnation may be used, or the impregnation may be carried out in a number of ridges such that the first impregnation is impregnated with a low viscosity resin and the second impregnation is impregnated with a higher viscosity resin than the first impregnation, so that more uniform impregnation can be achieved. good. A curing agent, a crosslinking agent, a polymerization initiator, a monomer diluent, a filler, a reinforcing agent, etc. can be added to the resin as necessary. Further, the above resin may be used as it is, but it is preferable to use it after defoaming under reduced pressure, in order to suppress the generation of bubbles in the resin-impregnated cloth. Copper as metal foil,
Single, alloy, or composite foils of 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 adhesiveness.

The laminating roll may be made of metal, rubber, composite or resin, or may be one in which the surface of the metal roll is lined with rubber, composite or resin. During lamination, it is preferable to generate a resin pool between the laminating roll and the resin-impregnated cloth to prevent air bubbles from forming within the resin-impregnated cloth.
That's true. Further, a plurality of laminating rolls can be used, such as one for laminating only the resin-impregnated base material and one for laminating the copper foil. The curing temperature and curing time of the elongated strip-shaped laminate can be selected depending on the type of resin, but it is important that the curing is performed at no pressure to 20 Kq/d.

An embodiment of the present invention will be described below based on the illustrated embodiment.

Embodiment FIG. 1 is a simplified process diagram showing an embodiment of the method for manufacturing a laminate according to the present invention.

As shown in the gx diagram, four sheets of long resin-impregnated cloth 1 were prepared by impregnating a long fluororesin fiber cloth (manufactured by Daikin Industries, Ltd., Polyflon cloth) with a vacuum-defoamed unsaturated polyester resin containing benzoyl peroxide with a width of 10501JII. Thickness 0 on the top and bottom surfaces of
．． A long strip-shaped laminate 4 made by disposing a 035 m long adhesive-coated copper foil 2 with the adhesive side facing the resin-impregnated cloth and laminating it with a laminating roll 3 is sent to a curing furnace 5 and cured by heating at 145° C. under no pressure. Thereafter, it was cut into pieces of 1000 x 1 G00 m using a cutter 6 to obtain a double-sided copper-clad laminate 7 with a thickness of 0.8 mm. Comparative Example The same long resin-impregnated cloth as in the Example was sized 1050 x 1050.
Four pieces cut to Jul were stacked, and the same steel foil as in the example cut to the same dimensions as above was arranged on the top and bottom surfaces, and heated and pressed at 145°C and 40KQ/7 for 60 minutes to achieve a thickness of 0. ．． A double-sided copper-clad laminate of 8 fi was obtained.

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

Table 1 [Effects of the Invention] The present invention has the following features as described above. The method for manufacturing a laminate having the structure described in the claims has the advantage that a laminate with less warpage can be obtained.

[Brief explanation of drawings]

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 product, 2 is a copper foil, 3 is a laminating roll, 4 is a long strip-shaped laminate, 5 is a curing furnace, 6 is a cutter 7
is an MfM board.

Claims (1)

[Claims] (1) A long metal foil is layered on the upper and/or lower surfaces of the required number of long resin-impregnated fluororesin fiber cloths, and the laminated long strip-shaped laminate is continuously transferred through laminating rolls arranged above and below. A method for manufacturing a laminate, which comprises curing the laminate and then cutting it into required dimensions.