JPH0714633B2 - Continuous metal-clad laminate manufacturing method - Google Patents

Description

The present invention relates to a method for continuously producing a metal-clad laminate for a printed wiring board.

[Conventional technology]

Conventionally, a metal-clad laminate for a printed wiring board is a prepreg obtained by impregnating a fibrous base material such as paper or glass cloth with a thermosetting resin varnish and drying the cut prepreg to a required size, and stacking the prepreg on a flat plate. It is usually manufactured by a batch method in which heat and pressure molding is performed by a press.

Since this batch method has many steps, requires many manpower, and requires energy, a streamlined continuous manufacturing method has been developed in recent years. The continuous manufacturing method is disclosed in JP-A-55-4838 and JP-A-
As shown in 56-98136, this is a method in which a plurality of long base materials are continuously fed in parallel while being impregnated with respective resins, and then these are superposed and heated and pressed.

[Problems to be Solved by the Invention]

In the heating and pressurizing device used for continuous production that has been developed in recent years, the resin-impregnated base material is changed in the moving molding,
At the initial stage of the curing reaction, it flows at a high temperature and flows outward from both edges from the edge of the base material. This outflow resin contaminates the metal foil and further contaminates the molding rolls, belts, etc., but also causes the resin to flow out, resulting in poor thickness accuracy of the product. In order to solve this problem, measures such as widening the width of the metal foil or carrier film, or a method of sucking out the resin that has flowed out on both sides of the base material, and arranging resin absorbents on both sides of the base material are taken. Although it was carried out, it resulted in high manufacturing cost.

In particular, as a resin outflow countermeasure, there is a method of arranging sealing gaskets on both sides of the base material. However, it is not possible to prevent resin outflow during high-pressure molding only by arranging a gasket by this method, but even if it is possible to prevent it, there is a drawback that the plate thickness at both ends of the product becomes thicker than the center part. Appears.

In view of the above problems, it is an object of the present invention to provide a continuous method for producing a metal-clad laminate having a sealing gasket or the like on both sides of the base material and having excellent plate thickness accuracy.

[Means for Solving the Problems]

A plurality of long sheet fibrous base materials are arranged in parallel and continuously impregnated with a thermosetting resin, and a long metal foil is further provided on one or both sides of a laminated material in which these resin-impregnated base materials are stacked. In the continuous production of a metal-clad laminate that is passed through a heating / pressurizing device after being stacked, a sealing gasket that moves together with the base material on both ends of the resin-impregnated base material in the heating / pressurizing device, and a base on the outside of the gasket. A backup guide band that moves with the material is arranged, and the spacing between the edge and the guide band is gradually widened from the hot pressure start point to the end point. It is a continuous manufacturing method characterized by arranging.

Next, the present invention will be described with reference to the drawings. In FIG. 1, a resin-impregnated base material 1 in which a plurality of resin-impregnated base materials are stacked and a sealing gasket 2 in contact with both side ends thereof are fed between upper and lower belts of a double endless belt 4 and moved together with the belt.
There are pressure rolls 5 above and below the two upper and lower belts, and the upper and lower pressure rolls press the resin-impregnated base material 1 via the belts. The backup guide band 3 is moved endlessly from the double endless belt 4 by a mechanism.
While being in contact with the belt 4, they move at the same level and at the same speed. In addition, the guide band 3 is independently fixed and held in position against the resin pressure from the inside by a guide band positioning roll 6 which is a vertical column and is a vertical cylinder. In FIG. 1, the heating mechanism is not shown.

As the gasket for sealing, paper, felt, cloth, leather, natural rubber, synthetic rubber, thermoplastic resin or the like can be used, but rubber or thermoplastic resin is preferable from the viewpoint of sealing effect and cost. The cross-sectional shape may be a round shape, a polygonal shape, or a combination thereof, but a round shape or a hollow round shape is preferable in terms of sealing effect. Its thickness is 1 to 2.0 times the product thickness.

The distance between the guide band and the edge of the base material is gradually increased from the heating and pressurizing start point to the end point in the forward direction of the moving direction of the base material.

The guide band is preferably made of metal, preferably copper and brass, which do not damage the belt. The pressurizing method uses one or more endless belts and is of a roll type, a pneumatic type, a hydraulic type, or the like, and there is no particular limitation.

[Action]

When only the gasket having the configuration of the present invention is arranged, the gasket is pushed outward by the fluid pressure of the resin and moves toward the edge of the base material, and the sealing effect of the resin is lost.

According to the configuration of the present invention, the guide band is arranged outside the gasket, moves endlessly in the same speed and direction as the base material and the gasket, and is supported by the positioning roller of the guide band that freely rotates on the upright shaft in the upright fixed state. The pressure of the gasket prevents it from moving outward.

The distance between the edge of the base material and the guide band is gradually wider from the start of heating and pressurization to the end point in the front direction of movement of the base material.
During the heating and pressurizing time, the thickly laminated material is subjected to heat and pressure to be melted and flown through the resin to be cured, and at the same time, the laminated material becomes thin and has a desired thickness. This thickness adjustment can be performed with high accuracy from the hot pressing start point to the end point and from the central portion to the edge portion.

〔Example〕

In the heating and pressurizing device of the present invention shown in FIG. 1, the endless belt 4 has a width of 60 cm and a pressurizing portion length of 300 cm. Thickness 0.3
3 pieces of 5mm glass non-woven fabric and 1 piece of 0.2mm thick glass cloth are sent together, and epoxy resin is individually applied so that the adhesion amount becomes 90% by weight and 60% by weight, laminating a copper foil of 35μ thickness on the upper and lower surfaces, 170 ° C., 2 at 2 kg / cm ²
Molded for minutes. The gasket 2 used has a cross-sectional area of 12.6 mm.
² round hollow rubber cord, guide band 3 width 30mm thickness 1.50m
It was a brass band of m. The distance between the gasket and the guide band,
The moving position was determined by the positioning roll 6 so that the molding start was 4.0 mm and the molding end was 5.8 mm.

The copper clad laminate obtained by the above method has excellent electrical characteristics, good appearance, and good plate thickness accuracy in the width direction (σ <0.015).
Met.

〔The invention's effect〕

 The effects of the present invention are as follows.

(1) There is no contamination of the metal foil due to the outflow of resin, no contamination of the pressure roll and the pressure belt, and the quality is improved.

(2) The width of the metal foil and the carrier film can be reduced, and the cost can be reduced.

(3) The product plate thickness accuracy in the width direction of the base material could be improved.

[Brief description of drawings]

FIG. 1 is an explanatory view of an embodiment of the present invention. 1 ... Resin impregnated base material, 2 ... Seal gasket, 3 ...
… Guide band, 4 Double endless belt, 5 Pressure roll, 6 Guide band positioning roll, 7 Product.

Claims (2)

[Claims] 1. A plurality of long sheet-shaped fiber base materials arranged in parallel and continuously impregnated with a thermosetting resin, and the resin-impregnated base materials are superposed on one or both sides of a laminated material. In the continuous production of a metal-clad laminate through which a length of metal foil is laminated and then passed through a hot press, a sealing gasket that moves in contact with both ends of the resin-impregnated base material inside the press and moves at the same level A metal-clad laminate characterized by arranging a guide band, gradually widening the distance between the guide band and the edge from the start point to the end point of the heat pressing, and contacting a positioning roll of an upright fixed cylinder to the outside of the guide band. Continuous plate manufacturing method. 2. The method for continuously producing a metal-clad laminate according to claim 1, wherein the guide band is made of copper or brass and is rotated as an endless link structure.