JPS6349406A - Manufacture of laminated sheet for printing circuit - Google Patents

Abstract

PURPOSE:To prevent a copper foil from creasing by reducing a quantity of resin of an end part of a prepreg, by a method wherein when a base is impregnated with the resin and passed through two rolls controlling the quantity of the resin, hot forming is performed by laminating a plurality of sheets of the bases after dryness and cutting- off of the base by dropping a solvent on a rolling part of an end part of the base. CONSTITUTION:When a base 1 is impregnated with resin and passed through a space between two rolls controlling a quantity a of the resin, hot forming is performed by laminating a plurality of sheets of the bases 1 after dryness and cutting-off of the base by dropping a solvent on a rolling part of an end part of the base. The solvent is dropped on a squeeze roll 2 through a pipe 3 led from a solvent tank 4. A dropping position is a part coming into contact with both ends of the base 1. The equipment controlling a quantity of a drop is preferably operated with a valve 5, and the solvent to be dropped is one having favorable compatibility with a resin solution such as acetone or methyl ethyl ketone or methyl Cellosolve. When a hot forming is performed by laminating a plurality of sheets of prepregs after dryness and cuttng-off of the prepreg, a laminated sheet which is hard to generate copper foil creases can be manufactured.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a method for manufacturing a printed circuit laminate.

[Prior art]

Prepreg used in printed circuit laminates is obtained by impregnating a base material with resin and drying it. However, this type of prepreg has a large amount of resin at the edges in the flow direction, so the edges are thicker than the inside. Become. When a plurality of these layers are stacked, the thickness of the end portion increases.

In recent years, 18μ copper foil has become mainstream for printed circuit laminates.
When a prepreg with thick edges is used, wrinkles tend to occur in the copper foil, which hinders stable production of laminates.

[Purpose of the invention]

As a result of studies aimed at preventing wrinkles in copper foil by reducing the amount of resin at the ends of prepreg, the present invention has been developed to reduce the amount of resin at the ends of prepreg by dropping a solvent onto the roll. The aim is to stably produce high-quality laminates.

[Structure of the invention]

In the present invention, when a base material is impregnated with resin and passed through two rolls (squeeze rolls) that adjust the amount of resin, a solvent is dripped onto the roll portion at the end of the base material, and after drying and cutting, , is a method for manufacturing a laminate, characterized in that a plurality of these base materials are laminated and hot-press molded.

The present invention will be explained based on FIGS. 1 and 2.

Figure 1 is a schematic diagram showing the prepreg manufacturing process.
1) is a base material, (11) is a resin impregnation device, (12) is a squeeze roll, (13) is a dryer, and (14) is a cutting device.

Figure 2 is a perspective view of a solvent dripping device that drips solvent onto a squeeze roll, where (1) is the base material, (2) is the squeeze roll, (3) is the solvent dripping zip, and (4) is the solvent tank. ,
(5) is pulp.

The solvent is dripped onto the squeeze roll (2) from the solvent tank (4) through the pipe (3), and the dripping position is the part that contacts both ends of the base material (1).

It is most effective if the solvent is dripped onto other rolls in the impregnation area ((11) in Figure 1) in addition to the squeeze roll (2).

It is preferable that the solvent dripping device be a device that can adjust the dripping amount depending on the pulp (5).

The solvent to be added dropwise is usually one used for preparing the resin liquid, such as acetone, methyl ethyl ketone, methyl cellosolve, etc., which has good compatibility with the resin liquid.

After drying and cutting the thus obtained prepreg, a plurality of prepregs are laminated and hot-press molded to produce a K-shaped laminate in which copper foil wrinkles do not occur.

〔Effect of the invention〕

According to the manufacturing method of the present invention, the amount of resin adhered to the ends of the prepreg is reduced, and even if multiple sheets of prepreg are laminated, an increase in the thickness of the ends can be prevented, so even if laminated with copper foil, Copper foil wrinkles are less likely to occur. It also has great industrial value, as it allows smooth operation of equipment in the process of combining copper foil and prepreg.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram showing the presoreg manufacturing process. FIG. 2 is a needle view of a solvent dripping device that drips a solvent onto a squeeze roll. (1) is the base material (2) is the squeeze roll (3)
is the solvent dripping tube (4) is the solvent tank (5) is the pulp (11) is the resin impregnation device (12) is the squeeze roll (13) is the dryer (14) is the cutting device

Claims (1)

[Claims] When the base material is impregnated with resin and passed between two rolls to adjust the amount of resin, a solvent is dripped onto the roll portion at the end of the base material, dried, and cut, and then multiple sheets of this base material are laminated. 1. A method for producing a laminate, which comprises hot-pressing forming.