JPH04338537A - Continuous manufacture of laminated sheet for electric use - Google Patents

Abstract

PURPOSE:To prevent curving, cutting and zigzaging by a method wherein each base material is impregnated with an excess resin liq. and is forwarded into collecting rolls at a specified forwarding angle to collect base materials and to squeeze excess resin soln. in manufacturing an unclad insulating sheet etc., for supporting electronic parts. CONSTITUTION:Base materials 1 are fed into an impregnation chamber 2 under separated condition and in parallel each other and they are each impregnated with an excess amt. of resin liq. which is five times the necessary amt. or less and then, they are fed between collecting rolls 7 and 7 through guide rolls 3-6. In this case, the forwarding angle to the collecting rolls 7 and 7 are set within 30 deg. to the vertical direction. Then, each base material 1-1 is laminated and integrated by means of the collecting rolls 7 and 7 and excess resin liq. is squeezed. This laminate 8 of the base materials is forwarded to laminating rolls 9 wherein a cover sheet and a metal foil 10 are laminated thereon.

Description

[Detailed description of the invention]

Background and Problems of the Invention The present invention relates to a method for manufacturing electrical laminates by a wet continuous process. Here, the electrical laminate refers to an unclad insulating board that supports various electronic components and devices, and a single-sided or double-sided metal foil-covered laminate for printed wiring boards, both of which are of the rigid type.

Conventionally, this type of electrical laminate has been manufactured using a dry discontinuous method in which a base material is impregnated with resin varnish, dried once to create a prepreg, and a predetermined number of prepregs are piled up and compression molded using a press. However, in recent years, products manufactured by the wet continuous method have been on the market, and are widely used in consumer, OA, and industrial electronic and electrical equipment.

[0003] Japanese Patent Laid-Open No. 55-126418 (Japanese Patent Publication No. 62-6513) filed by the present applicant discloses a method for manufacturing electrical laminates by such a wet continuous method. In the wet continuous method, it is not possible to apply as high a molding pressure as in the dry discontinuous method, so an excess amount of resin is applied to each base material in order to prevent re-separation of the impregnated base material laminate during transportation and to prevent air from entering between the base material layers. liquid is supplied. Here, "excessive" means that the amount of resin liquid is greater than the amount that fills 100% of the voids in the base material. Therefore, when these impregnated base materials are laminated and combined by a collecting roll, excess resin liquid is pushed out backward in the traveling direction, and a resin liquid pool is likely to be formed. When such a resin liquid pool is formed, if the base material is a glass base material, it tends to bend, and if the base material is paper or a glass mat, it tends to cause paper breakage or meandering.

[0004] An object of the present invention is to eliminate such inconveniences.

[0005] Method of solving the problem The present invention separates a plurality of base material rows, conveys them in parallel and continuously, and individually transfers them to the base material rows, which are themselves liquid and do not generate reaction by-products during curing. Continuous production of electrical laminates, which includes the steps of impregnating a curable resin liquid, laminating and combining impregnated base materials, laminating a cover sheet and/or metal foil, continuously curing, and then cutting into desired dimensions. Regarding the method.

According to the present invention, the above-mentioned problem is solved by supplying an excess amount of resin liquid to each base material that is separated and conveyed, and also ensuring that all the base materials are transported toward the collection roll that laminates and combines the impregnated base materials. This problem can be solved by arranging the base materials so that they have an approach angle of at most 30° with respect to the vertical direction, and collecting these base materials with the collecting roll, and at the same time squeezing at least a portion of the excess resin liquid away from the collecting roll. .

Preferred Embodiment FIG. 1 is a schematic diagram illustrating the method of the invention. Here, the steps of impregnation and combination of the impregnated base material are mainly shown, and other steps are described in Japanese Patent Application Publication No. 55-126418 (Patent Publication No. 62-65) filed by the present applicant.
13) etc., so it is omitted.

The substrates 1 are separated in the direction shown and conveyed in parallel and continuously, and in the impregnation chamber 2, each substrate is individually treated with excess resin liquid, for example, an excess amount of up to 5 times the required amount. is supplied. The substrate row 1 leaving the impregnation chamber is guided by guide rolls 3, 4, 5, 6 whose length is preferably larger than the width of the substrate 1, separated and transported, and from the last guide roll 6 to the collecting roll 7. , and are laminated and combined into an integrated laminate 8. Thereafter, a metal foil and/or a cover sheet 10 are laminated on both upper and lower surfaces of the laminate 8 by a laminating roll 9, and the laminate is placed in a curing furnace (not shown), and after curing is cut into a predetermined size.

According to the present invention, all the impregnated substrates 1 leaving the last guide roll 6 enter the collecting roll 7 with an entry angle within 30° with respect to the vertical direction. A guide roll 6 and a collecting roll 7 are arranged. These base materials are compressed between the collecting rolls 7, 7, and excess resin liquid is squeezed out rearward in the transport direction. However, since all the base materials rise at a steep angle toward the collecting roll 7, the squeezed liquid goes far away from the collecting roll 7 and the base material 1.
The particles are dispersed along the flow and do not accumulate in one place on the base material near the collecting roll 7.

[0010] Therefore, the base material does not sag due to the weight of the accumulated resin liquid, thereby preventing the glass base material from bending, and in the case of paper or glass mats, paper breakage or meandering will not occur.

[0011] As the base material used in the present invention, known materials such as linter paper, kraft paper, mixed paper, glass cloth, asbestos cloth, and glass paper, which are mainly composed of cellulose fibers, can be used. Among these, it is preferable to use a glass substrate that is prone to bending, as the effects of the present invention can be particularly exhibited. The resin is a resin that does not require a drying process and can itself be a component of a cured product, and liquid unsaturated polyester resins and epoxy resins are particularly suitable, but thermosetting resins such as diallyl phthalate resins and vinyl ester resins, etc. are also suitable, but are not limited to these. Metal foils include electrolytic copper foil, rolled copper foil, aluminum foil, etc., but electrolytic copper foil is the most common.

[0012] It goes without saying that additives such as flame retardants, flame retardant aids, fillers, colorants, and curing catalysts, which are usually added to electrical laminates, may be added to these resins.

[0013] The fact that the resin is thermosetting does not necessarily mean that the actual curing is carried out by heat, and the actual curing may be carried out by room temperature curing, light beam, electron beam, radiation, or the like.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram illustrating the method of the present invention.

[Explanation of symbols]

1 Base material 2 Impregnation chamber 3, 4, 5, 6 Guide roll 7 Collective roll 8 Impregnated base material laminate

Claims (1)

[Claims] Claim 1: A plurality of base material rows are separated and transported in parallel and continuously, and each of the base material rows is individually impregnated with a curable resin liquid that is itself liquid and does not generate reaction by-products during curing. In a continuous manufacturing method for electrical laminates, which includes the steps of laminating and combining impregnated base materials, laminating a cover sheet and/or metal foil, curing continuously, and then cutting into desired dimensions, Excess resin liquid is supplied to each base material being transported, and all base materials are arranged so that they have a maximum approach angle of 30° with respect to the vertical direction toward the collecting roll that laminates and combines the impregnated base materials. A continuous manufacturing method for electrical laminates, characterized in that, at the same time as the base materials are collected by the collection roll, at least a portion of the excess resin liquid is squeezed away from the collection roll.