JPS5942927A - Varnish impregnating method of base material for laminated board - Google Patents

Abstract

PURPOSE:To cause a base material to evenly and adequately impregnate with varnish of high density by such an arrangement wherein a base material for laminated board is brought to contact with the surface of a revolving roll which rotates with its lower part kept immersed in varnish in a varnish tank and it is moved. CONSTITUTION:Since a revolving roll 3 (preferably a rubber roll) rotates with its lower part kept immersed in varnish in a varnish tank 2, a layer of varnish in the varnish tank 2 rotates being adhered to the surface of the revolving roll. The layer of varnish on the revolving roll 3 and a base material, for laminated board are jointly pressed to the side 4 of the revolving roll by a press roll 5 and the base material 1 is impregnated with varnish. EFFECT:Since varnish of high density is used, the loss of solvent in the process of impregnation is reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for impregnating a base material for a laminate with varnish, and its purpose is to reduce solvent loss during the impregnation process by using a high-strength fest.

Conventionally, when manufacturing flip-pregs by impregnating and drying the base material for laminates with phenol, two coats are generally used: an undercoat varnish and a topcoat varnish.
Methods such as stage impregnation treatment or adjusting the amount of adhesion using one dip roll and then a squeeze roll have been used, but each method requires impregnation, so only low-concentration phenol can be used. Therefore, the solvent loss during the impregnation process was large.

The method of the present invention solves the above-mentioned drawbacks, and is made of woven fabrics, non-woven fabrics, mats, and paper made of inorganic fibers such as glass and asbestos, organic synthetic fibers such as polyester, polyamide, polyvinyl alcohol, and acrylic, and natural fibers such as cotton. Alternatively, a base material for a laminate such as a combination base material of these can be mixed with phenol resin, epoxy resin, unsaturated polyester resin, melamine resin, polyimide resin, polysulfone, polyphtadiene, fluorinated resin, polybutylene terephthalate, etc. in a varnish tank. The side surface of a rotating roll that rotates with its lower part immersed in phenol, which is made by adding a solvent such as water, methyl alcohol, acetone, cyclohexanone, or styrene to polyether ether ketone, etc. alone or as a V-modified product or a mixture, etc., as necessary. Since the phenol is moved in contact with the phenol, it is possible to uniformly impregnate the laminate substrate even with a high concentration of pheno, thereby making it possible to significantly reduce solvent loss. Metal rolls, plastic rolls, rubber rolls, etc. are used as the rotating rolls, and although there are no particular requirements, it is preferable to use plastic rolls or rubber rolls that have good elasticity to allow more uniform impregnation. 'it, 8.

An embodiment of the present invention will be described below with reference to the drawings.

1 is a base material for a laminate, and the base material 1 is moved in a varnish tank 2 with its lower part immersed in varnish by bringing it into contact with the side surface 4 of a rotating rubber roll 3 using a presser roll 5. This is a book that will help you impregnate the thick 11c varnish uniformly and thoroughly.

According to the method of the present invention, the amount of resin is 131% (hereinafter referred to as j
The varnish concentration necessary to obtain a prepreg of bamboo (denoted as "bamboo") was 12%, and the volatile content was stopped at 5%. However, according to the conventional impregnation method, in order to obtain a prepreg with the same resin content of 13φ, the varnish concentration required was 8% and the volatile content Il'i was 7%.

As explained above, according to the method of impregnating JN material for laminates with varnish according to the present invention, high concentration varnish can be absorbed, so it is possible to significantly reduce solvent loss in the impregnation process. 0 that is a thing

[Brief explanation of the drawing]

The drawing is a simplified cross-sectional view showing the method of starting from wood. 1 is the base material for the laminate, 2 is the varnish tank, 3...1ml
1 lji rubber roll, 4 is the rotating roll side part, 5...
・It is a presser roll. Special W “Applicant Matsushita Electric Works Co., Ltd.

Claims (2)

[Claims] (1) A method for impregnating varnish into a T-layer plate base material, which comprises moving the laminate base material in a varnish tank in contact with the side surface of a rotating rotating roll with the lower part immersed in phenol. . (2) The method for impregnating a laminate substrate with varnish according to claim 1, wherein the rotating roll is a rubber roll.