JPH02209233A - Continuous preparation of copper clad laminated sheet - Google Patents

Abstract

PURPOSE:To obtain a copper clad laminated sheet having no depression and flaw on the surface of the copper foil thereof by covering the surface of a belt with the copper foil used in lamination molding in a close contact state. CONSTITUTION:Eight long resin impregnated base materials 1 wound around rolls are supplied toward a double belt press inlet 4 to be superposed on copper foils 2 and subsequently heated and pressed in a double belt press to form a copper clad laminated sheet 3. Herein, the long copper foils 2 are closely brought into contact with the surfaces of belts 6 reversing on the side of a double belt press outlet 5 from copper foil rolls and continuously fed toward the inlet 4 of the double belt press in this state. A cleaner 7 equipped with a dust collector is arranged on the outlet side of the double belt press and the copper foils 2 are immediately brought into contact with the cleaned bolts.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to an improvement in a continuous manufacturing method for copper-clad laminates used for printed wiring boards for electrical and electronic equipment, etc.

[Conventional technology and its problems]

Printed wiring boards used in electronic devices are required to have finer wiring circuits as component mounting density increases. To create printed wiring boards with fine circuits, it is essential to use copper-clad laminates with no defects on the copper foil surface. In this case, fatal defects such as disconnections and short circuits occur in the fine circuits of the resulting printed wiring board.

Copper-clad laminates are manufactured by laminating and molding a resin-impregnated base material and copper foil. This method involves the multi-role hot platen press method, in which laminated materials made of prepreg, copper foil, etc. cut to predetermined dimensions are placed between multiple pairs of hot plates via mirror plates, heated and pressed, and the long There is a continuous method using a double belt press that heats and presses a laminated material consisting of a resin-impregnated base material and a long copper foil, which is supplied between a pair of belts. In order to reduce the defects on the surface of the copper foil, the latter double belt method is superior in terms of improving the thickness distribution of the obtained copper-clad laminate and reducing surface irregularities.

The surface of the metal belt used in the latter double belt press is usually cleaned and then the laminated material is sandwiched between the belts. However, floating dust often adheres to the surface of the metal belt and is trapped in that state, causing defects such as dents and scratches on the surface of the copper foil.

[Means to solve the problem]

The present inventor has completed the present invention as a result of intensive study on a method to solve the above-mentioned drawbacks by taking advantage of the features of continuous press.

That is, in the present invention, a laminated material consisting of one or more long resin-impregnated base materials and a long copper foil layered on one or both outermost surfaces thereof is supplied between a pair of belts and heated. In the manufacturing method of copper-clad laminates using the pressurized double belt press method, a long copper foil is supplied from the double belt press exit side, is brought into close contact with the belt surface that is turned over to the entrance side, and is then transferred to the double belt press entrance side as it is. This is a continuous production method for copper-clad laminates in which the copper foil is continuously conveyed and layered on a resin-impregnated base material under heat and pressure. It is meant to be in close contact with each other.

The configuration of the present invention will be explained below.

First, the continuous press of the present invention is typified by the conventionally known double belt press, in which the copper foil is supplied from the outlet side rather than from the conventional inlet side, and the copper foil is supplied from the inlet side while covering the belt. This is achieved by adding a device to supply the water. Here, the pressurization and heating conditions may be the same as conventional ones, but the use of preheating of the laminated material (Japanese Patent Application No. 63-45771) and other appropriate combinations are used.

The thermosetting resin-impregnated base material used in the continuous press of the present invention refers to a normal thermosetting resin (=matrix resin) and a base material (
= base material, reinforcing base material).

Examples of matrix resins include phenol resins, epoxy resins, unsaturated polyester resins, cyanato resins, and other thermosetting resins, compositions formed by appropriately blending two or more of these, and furthermore, these thermosetting resins, and two or more of these. Compositions containing more than one species modified with polyvinyl butyral, acrylonitrile-butadiene rubber, polyfunctional acrylate compounds and other known resins, additives, etc.; crosslinked polyethylene, crosslinked polyethylene/epoxy resin, crosslinked polyethylene/cyanato resin, Examples include crosslinked curable resin compositions made of polyphenylene ether/epoxy resin, polyester carbonate/cyanate, and other modified thermoplastic resins.

In addition, base materials include kraft paper, linter paper, glass (E, D, S, T, quartz and other various glass fibers) woven and non-woven fabrics, fully aromatic polyamide, polyphenylene sulfide, polyether ether ketone, Examples include woven and nonwoven fabrics made of heat-resistant engineering plastic fibers such as polyetherimide and polytetrafluoroethylene, as well as long composite fabrics and nonwoven fabrics made by appropriately mixing or combining these materials.

This elongated base material is impregnated with the above-mentioned matrix resin, coated, etc., and dried as appropriate to produce the prepreg for laminate molding of the present invention. In the present invention, either one with the same components as in the case of a conventional multi-stage press but with a more advanced B-stage than when used in a multi-stage press, or one developed for continuous presses may be used.

Copper foils include long electrolytic copper foils, rolled copper foils, etc., as well as those whose back surfaces (adhesive side) have been treated for adhesion, and those with an adhesive layer formed on the back surface. It is possible, and it is selected depending on the type of resin of the resin-impregnated base material described above.

A copper-clad laminate is manufactured using the above method according to the manufacturing method of the present invention, and is usually cut into a predetermined size.

Copper foil is supplied from the discharge side of the copper-clad laminate of the double belt press, with the adhesive side of the copper foil facing outward, and is brought into close contact with the metal belt of the double belt press. It is overlapped with the base material on the side and fed to the pressure heating zone.

At this time, it is preferable that the copper foil be placed in close contact with the belt as close to the laminate discharge position as possible, and that the copper foil be in close contact with the belt over a range of 70% or more of the belt length from the exit side to the inlet side. is suitable. Further, when installing a cleaner or the like for the purpose of cleaning the belt surface, it is preferable to install it immediately after that.

The continuous manufacturing method of copper-clad laminates of the present invention is characterized by closely covering the belt of a double belt press with copper foil as described above, and other than using this feature, various methods can be used. It is possible to implement the embodiment. For example, a long releasable film is inserted between the prepregs to produce a semi-hardened resin bonding plate with copper cladding on one side; a bonding plate with a large number of holes at predetermined positions is used to manufacture the bonding plate.
Partially bonded bonding board; Part of the prepreg is replaced with metal film to create a laminate with a metal core; Intermediate half-layer board is created by using adhesive-coated copper foil or a quick-curing adhesive layer. obtaining a cured resin laminate and post-curing it;
Examples include manufacturing a semi-cured resin copper-clad laminate and post-curing it.

〔Example〕

Next, embodiments of the manufacturing method of the present invention will be described with reference to the accompanying drawings.

FIG. 1 is a schematic diagram of the continuous copper-clad laminate manufacturing apparatus of the present invention, in which a long resin-impregnated base material [1] is wound into a roll.
Eight sheets are fed to the entrance side [4] of the double belt press,
After being laminated with copper foil [2], it is heated and pressurized in a double belt press to form a copper-clad laminate [3]. Here, the long copper foil 2 is brought into close contact with the surface of the belt [6] which is turned over at the exit side [5] of the double belt press from the copper foil roll, and is continuously conveyed as it is to the entrance side 4 of the double belt press. be done. Further, a cleaner with a cold collector [7] is installed on the exit side of this double belt press, and the copper foil 2 is immediately brought into close contact with the cleaned belt.

Through the above process, good copper-clad laminates with no dents or dust on the surface of the copper foil were continuously produced.

[Operation and effects of the invention]

As is clear from the detailed description of the invention, the continuous manufacturing method of copper-clad laminates using a double belt press of the present invention prevents dents from forming on the surface of the copper foil by closely covering the belt surface with the copper foil used for lamination molding.・It is possible to produce copper-clad laminates with high yield without scratches.

Therefore, the surface defect-free copper-clad laminate manufactured by the manufacturing method of the present invention can be suitably used for manufacturing high-density fine circuit printed wiring boards.

[Brief Description of the Drawings] Fig. 1 is a schematic diagram for explaining the flow of the continuous manufacturing method for copper-clad laminates of the present invention, and the numbers in the figure are as follows:
1; Prepreg, 2; Copper foil, 3; Copper-clad laminate, 4; Double belt press inlet, 5; Double belt press outlet, 6
; Double belt press belt; 7; Indicates a cleaner with a dust collector. Figure 1 Patent applicant Mitsubishi Gas Chemical Co., Ltd.

Claims (1)

[Claims] 1. A laminated material consisting of one or more long resin-impregnated base materials and a long copper foil layered on one or both of the outermost surfaces thereof is supplied between a pair of belts. In the manufacturing method of copper-clad laminates using the double belt press method, which uses heat and pressure, a long copper foil is supplied from the double belt press exit side, is brought into close contact with the belt surface that is turned over to the entrance side, and is then transferred to the double belt press entrance side. A continuous manufacturing method for copper-clad laminates, which is continuously conveyed to a resin-impregnated base material and heated and pressed. 2. The continuous manufacturing method of a copper-clad laminate according to claim 1, wherein the copper foil is brought into close contact over a range of 70% or more of the belt length from the outlet side to the inlet side of the double belt press.