JPS63158216A - Manufacture of laminated sheet - Google Patents

Abstract

PURPOSE:To make it possible to reduce the incidence of beat mark by a method wherein the cut surface of a coated cloth is heated up to a temperature, which is higher than the softening point of thermosetting resin and lower than its setting temperature, after the cutting of the coated cloth in continuous form. CONSTITUTION:A coated cloth in continuous form is cut in lengths with a cutter. After that, the cut surface of each sheet or a plurality of sheets of the coated cloth is heated up to a temperature, which is higher than the melting point of thermosetting resin and lower than its setting temperature, by means of hot air or a hot plate. By heating the whole cut surface of the coated cloth, the temperature of chips produced on the cut surface reaches the melting point of the resin, resulting an allowing the chips to fuse to the coated cloth. Consequently, the chips are prevented from flying in air and adhering to the surface of the constitutional material of a laminated sheet. As the thermosetting resin, general-purpose resin for laminated sheet such as phenolic resin, epoxy resin, polyester resin, polyimide resin or the like can be used.

Description

[Detailed description of the invention] (Industrial application field) The present invention relates to a method for manufacturing a laminate.

(Prior art) Conventionally, laminates for printed circuit boards, etc. have been made by impregnating and drying a long base material such as kraft paper, linter paper, glass woven fabric, glass non-woven fabric, etc. with a thermosetting resin face. obtained,
This coated fabric is cut into a predetermined size using a cutting machine, the required number of sheets are laminated, copper foil is added to one or both sides depending on the purpose, and the fabric is machined and formed.

(Problem to be solved by the invention) Chips generated when cutting the coated fabric remain on the cut surface of the coated fabric, and these chips scatter in the air and damage the laminate constituent materials. After adhering to the surface and forming, the laminate surface (
This may result in dents (fine irregularities or scratches) mainly on the copper foil surface.

Recently, circuit conductors have become thinner due to the increased density of printed circuit wiring boards, but dents in laminates (mainly dents on the copper foil surface) can cause disconnections and short circuits in printed circuits. This has become a major problem in processing circuit wiring boards.

The present invention provides a method for manufacturing a laminate that reduces the occurrence of dents on the surface of the laminate by reducing the amount of chips generated when cutting the coated fabric.

(Means for Solving the Problems) The present invention cuts a long coated cloth into a predetermined length using a cutting machine, and then cuts the cut surface of the coated cloth one by one or every plurality of sheets using infrared rays. Hot air or 211! Using a plate, the cut surface of the coated cloth is heated to a temperature above the melting point of the thermosetting resin and below the curing temperature plate.

By heating the entire cut surface of the coated fabric, the chips generated on the cut surface reach their melting point, making it possible to fuse the chips to the coated fabric.

As thermosetting resins, phenolic resins, epoxy resins,
General resins for laminates such as polyester resin and polyimide resin can be used.

Example In manufacturing an epoxy resin laminate, a long coated fabric was cut, the cut surface of the coated fabric was heated using far infrared rays to a temperature at which the resin softened, and then eight sheets of this coated fabric were laminated. Furthermore, copper foil is added to both sides and heated to form an epoxy resin laminate (1
240 pieces (m square) were manufactured. The incidence of dents at this time was 1.
It was 25%.

COMPARATIVE EXAMPLE Using a cut coated fabric obtained without heating the cut surface of the coated fabric immediately before cutting, 240 epoxy resin laminates were manufactured by thermoforming with the same configuration as in the example.

The occurrence rate of dents at this time was 7.50%.

(Effect of the invention) The present invention can greatly reduce the incidence of dents.

The heating method also requires only slight modifications to conventional equipment, and the method for producing a laminate according to the present invention is of extremely high value industrially.

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Claims (1)

[Claims] 1. In the method of manufacturing a laminate board, a long base material is impregnated with a thermosetting resin and dried, the coated cloth is cut into predetermined lengths, and the required number of cut coated cloths are laminated and heated and pressed. A method for manufacturing a laminate, comprising: cutting a long coated fabric, and then heating the cut surface of the coated fabric to a temperature above the softening point of the thermosetting resin and below the curing temperature.