JPH0489253A - Manufacture of laminated plate - Google Patents

Abstract

PURPOSE:To obtain a laminated plate free from warp generation by stacking a long metal foil on the surface of a required number of long bases impregnated with resin and a mold-parting type film on the other surface, then allowing these stacked bases to pass through a space between an upper and a lower arranged laminating roll and cutting a continuously moving long strip-like laminated product to the specified size after curing process and further removing the mold-parting type film following after- curing operation. CONSTITUTION:The adhesive side of a 0.035mm-thick copper foil 2 with an adhesive layer is stacked over the upper surface of four long bases impregnated with resin 1 consisting of long 1050mm-wide, 0.15mm-thick glass cloth impregnated with 45% of unsaturated polyester resin in an opposite position to a long base impregnated with resin 1. In addition, 0.035mm-thick aluminum foil 3 is stacked over the lower surface of these four bases 1, then this long stripe-like laminated product is allowed to pass through a space between upper and lower laminating rolls and then is cured by a curing furnace 6 at 160 deg.C under contact pressure after being sent there. The thermally deforming temperature of this cured product is 90 deg.C. Next, the cured product is cut into 1000X1000mm size pieces using a cutter 7, then is heated at 100 deg.C by a heating furnace 8. Finally, the aluminum foil 3 is removed to obtain a 0.8mm-thick laminated plate with one surface copper-plated.

Description

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

[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 using a multistage press for a long time of 1 to 2 hours. The drawback is that molding distortion remains in the laminate, causing warping due to the heat generated when processing the laminate into a printed wiring board or when mounting electronic components on the printed wiring board, causing problems in automatic processing. there were. This tendency was particularly strong for single-sided metal foil-clad laminates.

[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 laminate that does not cause warpage.

[Means for solving problems]

The present invention is a long strip-shaped laminate in which a required number of long resin-impregnated substrates are laminated with a long metal foil on one side and a release film on the other side, and then passed between laminating rolls arranged above and below. The laminate manufacturing method is characterized by curing with continuous transfer, cutting into required dimensions, further after-curing, and then removing the release film, which eliminates or minimizes the need for pressurization. The present invention will be described in detail below.

The long resin-impregnated substrate used in the present invention is made of inorganic fibers such as glass ashest, organic synthetic fibers such as polyester, polyacrylic, polyvinyl alcohol, polyamide, polyimide, polyphenylene sulfide, polyurethane, and natural fibers such as cotton. A phenol resin, an epoxy resin, an unsaturated polyester resin, a polyimide resin, etc. alone, a modified product, or a mixture thereof is applied to a base material of woven fabric, nonwoven fabric, mat, paper, or a combination thereof in a resin amount of 40 to 60% by weight (
In the resin impregnation, it is preferable to perform the primary impregnation with a low viscosity resin of the same type or a different type because more uniform impregnation can be achieved.

In addition, aluminum hydroxide, talc,
Fillers such as silica and alumina can also be added.

Furthermore, although the resin may be used as it is, it is preferable to use it after degassing it under reduced pressure in order to suppress the generation of bubbles in the resin-impregnated cloth. Single, alloy, or composite foils of copper, aluminum, iron, nickel, zinc, etc. are used as long metal foils, and if necessary, an adhesive layer is provided on one side of the metal foil to further improve adhesion. You can also do so. As the release film, resin films such as polyester resin film, polyphenylene sulfide resin film, polyimide resin film, and fluororesin film, and metal foils such as copper, aluminum, stainless steel, and brass can be used. Laminating rolls are made of metal, comb,
A roll made of synthetic resin or a metal roll whose surface is lined with rubber or synthetic resin is also optional. The curing temperature and curing time of the long strip-shaped laminate can be selected depending on the type of resin, but curing can be done with no pressure to 20 kg/Cl! It is important that For after-curing after cutting, it is preferable to heat the resin to a temperature higher than the thermal deformation humidity of the resin used in order to remove residual strain.

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

〔Example〕

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 Fig. 1, four sheets of long resin-impregnated base material 1 are prepared by impregnating a long glass cloth with a width of 1050 inches and a thickness of 0.15 mm with unsaturated polyester resin to a resin content of 45%. Copper foil 2 with an adhesive layer 2 having a thickness of 0.035 nanometers on the upper surface is stacked with the adhesive side facing the long resin-impregnated base material 1, and further, a layer with a thickness of 0. The long strip-shaped laminate 5, which was laminated with aluminum foils 3 of 035 mm and passed between laminating rolls 4 disposed above and below, was sent to a curing furnace 6 and cured by heating at 160° C.1 contact pressure.

The heat distortion temperature of this cured product was 90°C. Next, the cured product was cut into pieces of 1000×1000+mn with a cutter 7, heated to 100°C in a heating furnace 8, and then aluminum foil 3
was peeled off to obtain a single-sided copper-clad laminate 9 having a thickness of 0.8 mm.

[Comparative Example] Four pieces of the same long resin-impregnated base material as in the example cut into 1050 x 1050 squares were stacked, and on top of that, a piece of the same copper foil as in the example cut into the same dimensions as above was arranged. Press between molding plates at a molding pressure of 40 kg/cnT,
Laminated at 160°C for 60 minutes to a thickness of 0.8 m.
A single-sided copper-clad laminate with a diameter of m was obtained.

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

Table 1 Note: This is the amount of warpage after etching the entire surface of a 500 x 500 mm sample.

〔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 base material, 2 is a copper foil, 3 is an aluminum foil, 4 is a laminate roll, 5 is a long strip-shaped laminate, 6 is a curing furnace, 7 is a cutter, 8 is a heating furnace, 9 is a laminate board It is.

Claims (1)

[Claims] (1) The required number of long resin-impregnated base materials are stacked with a long metal foil on one side and a release film on the other side, and then laminated continuously between laminating rolls arranged above and below. 1. A method for manufacturing a laminate, which comprises curing the laminate while allowing the film to transfer, cutting it into required dimensions, further after-curing, and then removing the release film.