JPS60189441A - Continuous manufacture of one-surface metallic foil lined laminated board - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a single-sided metal foil-clad laminate with a small amount of warpage. - A laminate made of paper, crow cloth, crow paper, etc. as a base material, which is laminated with multiple resin-impregnated base materials impregnated with a resin liquid and cured, and a metal foil on one or both sides of the laminate. Metal foil-clad laminates made by pasting these together are used as insulating boards and printed wiring boards.

Conventionally, these laminates have been manufactured using a batch method in which the base material is impregnated with resin varnish and dried, then the resulting bristle rugs are layered and molded by pressing and heating in a press, but recently, long base materials have been A continuous method has been developed that performs resin impregnation, lamination, curing, etc. while continuously conveying, and is attracting attention. For example, Japanese Patent Application Laid-Open No. 55-4838 by the present applicant. Same 56
See No.-98136, etc.

A single-sided metal foil-clad laminate manufactured by the above-mentioned method or the like tends to warp due to differences in thermal expansion coefficients of the materials constituting it or due to curing shrinkage of the curable resin.

This warp can be corrected by passing the laminate through a warp straightening device, which usually consists of three rolls, and bending the laminate in the opposite direction to the warp.

However, although it is possible to correct the curvature of the entire laminate depending on the method of passing it through three rolls, for example, it is difficult to correct the difference in local warpage between the edges and the center in the width direction of the laminate. It was impossible.

The present invention relates to a method for continuously manufacturing single-sided metal foil-clad laminates that improves the problem of curling and has less variation in warpage within the laminate, particularly in the width direction.

In other words, a plurality of sheet-like base materials are impregnated with a curable resin while being conveyed continuously, the impregnated base materials are laminated, and metal foil is laminated together. After continuous curing, one side is cut to a predetermined size. In the continuous production method of metal foil-clad laminates, the laminate after curing is forcibly deformed in the opposite direction to the warp direction by changing the curvature at the center and edges in the width direction, thereby correcting the warp. This is a continuous manufacturing method for single-sided metal foil-clad laminates.

Examples of resins include unsaturated polyester resins that are liquid at room temperature and do not produce gas or liquid byproducts during curing.
Vinyl ester resins and epoxy resins are preferred. As the base material, any material commonly used in the production of laminates, such as paper, glass cloth, and glass paper, can be used. As the metal foil, electrolytic copper foil, rolled copper foil, iron foil, aluminum foil, etc. are used, but electrolytic copper foil is most preferred.

The process up to curing of the laminate is described in the above-mentioned Japanese Patent Application Laid-Open No. 55-4.
838. It can be carried out in exactly the same manner as the method described in JP-A-56-98136 and the like. The process of correcting warpage in the present invention may be performed either before or after the length cutting device that cuts the laminate into predetermined dimensions, but it is carried out continuously in the section from the exit of the curing furnace to the length cutting device. is the most efficient, and the amount of warp in the resulting laminate is also small. Further, if necessary, warpage may be corrected at multiple locations.

An example of a warpage correction device is shown in FIG.

Reference numeral 1 denotes a lower back-up roll, and 2 a presser roll for pressing the laminate from above so as to follow the shape of the bank-up roll. In this example, metal foil is bonded to the upper side of the laminate 3, and the contact part of the presser roll 2 should be made of rubber, etc., which has a softer hardness than the metal foil, in order to avoid damaging the metal foil. desirable.

During the curing process of the laminate, there is a tendency for the edges to have a slightly larger warp than the center, which is caused by the convex metal foil surface. In order to reduce this, the lower backup roll is shaped like a drum, with diameters increasing on both sides.

In addition to the method shown in Figure 1, there is a method of forcibly deforming and correcting warpage by changing the curvature at the edges and the center, for example, as shown in Figure 2, a single piece that is paired with a back unroll is used. The curvature of the laminate can be corrected by using drum-shaped rolls, or by sandwiching the metal foil-clad laminate between a pair of narrow rolls as shown in Figure 3, and using at least two or more sets of rolls to correct the curvature of the laminate. A method of correcting the warpage by changing the warpage, or a method of combining the press roll shown in FIG. 2 and the backup roll shown in FIG. There is a method of omitting a part of the curvature, a method of passing through a slit having a predetermined curvature shape, etc., and any method may be used. Alternatively, a combination thereof may be used. The temperature of the laminate when correcting warpage is 100℃.
C or lower, preferably room temperature to 80C, is effective. When the temperature of the laminate exceeds 100°C, the corrected warpage tends to return to its original state.

According to the present invention, a good single-sided metal foil-clad laminate with little variation in warpage can be manufactured.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram of an example of the warpage correction device used in the present invention, and FIGS. 2 to 4 are schematic diagrams of other specific sides of the device. 1 is a backup roll, 2 is a presser roll, and 3 is a single-sided metal foil-clad laminate. 1st leap

Claims (5)

[Claims] (1) While continuously transporting multiple sheet-like base materials, impregnate them with a curable resin, laminate the impregnated base materials, and laminate them with metal foil. After continuous curing, cut into predetermined dimensions. A continuous manufacturing method for single-sided metal foil-clad laminates, which is characterized by correcting warpage by forcibly deforming the cured laminate in the opposite direction to the warp direction by changing the curvature at the center and edges in the width direction. A continuous manufacturing method for single-sided metal foil-clad laminates. (2) The manufacturing method according to claim 1, in which warpage is continuously corrected in the section from the curing furnace outlet to the length cutting device. (3) The manufacturing method according to claim 1 or 2, wherein the warpage is corrected by a pair of upper and lower rolls, and at least one of the rolls is a curvature roll. (4) The manufacturing method according to claim 3, in which the material of the contact portion of the roll that contacts the metal foil is softer in hardness than the metal foil. (5) The manufacturing method according to any one of claims 1 to 4, wherein the temperature of the laminate is 100° C. or lower when warping is performed.