JPH05200897A - Manufacture of laminate - Google Patents

Abstract

PURPOSE:To prevent the generation of soil and damage of metal foils and release films on the surface of a laminate generated by a support roll disposed in a curing oven in the continuous manufacturing method of laminates. CONSTITUTION:A continuous belt-shaped laminate 1 composed of the required number of pieces of a resin impregnated base composed of a continuous belt- shaped base impregnated with resin, continuous foils disposed on the upper face or lower face of the base and/or continuous release films is cured continuously while moving in a curing oven provided with a support roll 2 of same dimension as the width of the laminate 1 or shorter, and then cut into the required size to manufacture metal foil-clad laminates continuously in the laminate manufacturing method. Preferably the curing oven provided with resin receivers disposed at both end lower sections of the support roll is used.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for continuously producing a metal foil-clad laminate used for printed wiring boards and the like.

[0002]

2. Description of the Related Art In a conventional continuous production method for metal foil-clad laminates, substrates such as glass cloth, glass non-woven cloth and paper are used. This base material is impregnated with a resin, and the obtained resin-impregnated base material is squeezed with a squeeze roll to squeeze the resin, and a plurality of required numbers are laminated, and a long metal foil is formed on one surface and a long metal foil is formed on the other surface. A release film or a long metal foil is overlaid,
While continuously moving the long strip-shaped laminated body that is laminated and integrated through the laminator rolls arranged above and below, it is heated and cured in a curing furnace, and then cut into the required dimensions to continuously form a metal foil-clad laminated sheet. Manufacturing methods are known.

In the above continuous manufacturing method, the impregnating resin before curing flows out from both ends of the substrate by the action of the squeeze roll or the laminator roll, and the metal foil on the surface is contaminated. It also had a problem of contaminating the release film. As a solution to this problem, the applicant of the present application has previously proposed a method in which the size of the squeeze roll and the laminator roll is set to be approximately the same as the width of the laminate, in Japanese Patent Laid-Open No. 61-236591. The impregnated resin of the long strip laminate has fluidity until it is cured in the curing furnace, and the resin flows out from both ends of the base material. Therefore, when the width dimension of the support roll 2 is longer than the width dimension of the long strip-shaped laminate 1 as in the conventional example shown in the sectional view of FIG. Has a problem of contaminating the support rolls arranged in the curing furnace that supports the laminated body of, and as a result, contaminating or damaging the metal foil on the surface of the laminated plate that is successively moved and completed. It was

[0004]

SUMMARY OF THE INVENTION Therefore, the present invention, in a method for continuously producing laminated plates, prevents contamination and damage of a surface metal foil or a release film by a support roll arranged in a curing furnace. It is an object of the present invention to provide a continuous method for producing a metal foil-clad laminate.

[0005]

The present invention has been made in view of the above points, and is characterized by the required number of resin-impregnated base materials obtained by impregnating a long strip-shaped base material with resin. A curing furnace having a support roll having a length equal to or shorter than the width of the laminate, which is a laminate composed of a long metal foil and / or a long release film provided on the upper surface and / or the lower surface thereof. There is a method of continuously manufacturing a metal foil-clad laminate by cutting to a required size after curing while continuously moving with a curing furnace, preferably a curing furnace in which resin receivers are arranged under both ends of the support roll. There is a method for manufacturing a laminated plate using.

FIG. 1 is a sectional view of an embodiment of the present invention.
The present invention will be described below with reference to the drawings. The base material is impregnated with resin, and a long metal foil is laminated on one surface of the obtained resin-impregnated base material, and a long release film is laminated on the other surface of the resin-impregnated base material. A support roll 2 is a roll that supports the long strip-shaped laminated body 1 in the curing furnace in the process of continuously moving and producing the body 1. The width dimension of the support roll 2 needs to be the same as or shorter than the width of the long strip-shaped laminate 1. It is preferable that the length is short within the range of 0 to 50 mm. If it is less than 0, the support roll is contaminated by the impregnated resin that has flowed out. In the case of a support roll shortened by more than 50 mm, the end portion of the laminate droops significantly due to its own weight, and the finished product size becomes short, which is a problem. Support roll 2
By limiting the width dimension between the long strip-shaped laminate 1 and the width dimension relationship described above, the uncured impregnating resin flowing out from the long strip-shaped laminate 1 does not adhere to the support roll. . Therefore, the problem that the support roll is contaminated and, as a result, the metal foil on the surface of the laminate is contaminated or damaged is solved.

Under the above-mentioned conditions, it is possible to prevent the support roll from being contaminated by the resin flowing out from the long strip-shaped laminate before curing, but in order to prevent the curing furnace from being contaminated, further, the lower ends of the support roll are prevented. It is preferable to cure in a curing oven in which the resin receiver 3 is installed. As another method, a film or sheet of a replaceable synthetic resin, a metal foil, a metal plate or the like may be laid on the bottom surface of the curing furnace to receive the impregnated resin that has flowed out.

The above-described structure of the present invention can be applied to the dimensional relationship between the belt, the resin-impregnated base material and the width dimension in the continuous manufacturing method of the double belt pressing method.

As the squeeze roll and the laminator roll, the support roll 2 may be made of metal such as stainless steel, rubber, synthetic resin, or metal roll surface coated with rubber or synthetic resin. The resin receiver 3 may be made of metal such as stainless steel, or a synthetic resin molded product. Since these are arranged in the curing furnace, it is important to use a material that is not easily deformed or damaged by the heating temperature.

The curing conditions of the curing furnace can be selected from the curing temperature and the curing time depending on the type of the impregnated resin, but the curing can be performed without pressure or 20 kg / cm ² . After cutting, after baking above the heat distortion temperature of the resin used,
Cooling below the heat distortion temperature is preferable for reducing warpage and twist. It is particularly preferable to quench the cooling. When a release film is used, the warpage can be further reduced by removing the release film after cooling.

The resin-impregnated base material is a long strip-shaped base material impregnated with a resin, and can be cured later to form an insulating layer. As the long strip-shaped substrate, inorganic fibers such as glass or polyester, polyacrylic, polyvinyl alcohol, polyamide, polyimide,
Woven cloth, non-woven cloth, matte or paper made of organic synthetic fibers such as polyphenylene sulphite and urethane and natural fibers such as cotton, or a combination of these may be used. Woven cloth is used as the base material for the front and back layers, non-woven fabric is used as the base material for the core layer, non-woven fabric is used as the base material for the front and back layers, and woven fabric is used as the base material for the core layer. In between, it is possible to appropriately adopt a layer structure of a multilayer circuit in which inner circuit boards are combined.

The resin composition with which the base material is impregnated includes an unsaturated polyester resin, an epoxy resin, a polyimide resin, a fluorine resin, a phenol resin, a polyphenylene oxide resin, and the like, each of which has a resin content of 40.
It can be used by being impregnated so as to be ˜60 wt% (hereinafter simply referred to as “%”). For the resin impregnation, it is preferable to perform the primary impregnation with a low-viscosity resin such as a homogenous resin or a heterogeneous resin because more uniform impregnation can be performed. Further, the resin composition may contain aluminum hydroxide, clay, talc, silica, if necessary.
A filler such as alumina, magnesium carbonate, calcium carbonate, synthetic resin powder or a hollow body may be added in an amount of 1 to 200 parts by weight based on 100 parts by weight of the resin. Further, the resin composition may be used as it is, but it is preferable to use it after defoaming under reduced pressure in order to suppress generation of bubbles in the resin-impregnated base material. The nonwoven fabric substrate is preferably impregnated with the resin composition containing the filler.

[0013]

The resin impregnated in the long strip base material has fluidity before curing, and the long strip laminate before curing easily flows out from both ends of the base material when an external force is applied. If the width of the support roll that applies an external force is set to be the same as or shorter than the base material, even if there is resin that has flowed out, the support roll is no longer attached to the support roll, so that contamination of the support roll can be prevented. Therefore, the metal foil on the surface of the laminate can be prevented from being contaminated and damaged, and the metal foil-clad laminate having a good appearance can be efficiently produced.

Further, by disposing resin receivers at the lower ends of both ends of the support roll so as to partially overlap with both ends of the support roll, it is possible to receive the resin before curing flowing from the long strip-shaped laminate protruding from the support roll. Therefore, it is possible to prevent the curing furnace from being contaminated.

[0015]

【Example】

Example 1 As a resin composition, 100 parts by weight of a commercially available vinyl ester resin (R-806DA manufactured by Showa Highpolymer Co., Ltd.), 1 part by weight of coumer hydroperoxide, and styrene were further added so that the viscosity at 25 ° C. was 5 poises. A glass cloth base material (WE-18K-BS manufactured by Nitto Boseki Co., Ltd.) that forms the surface and back layers of the added resin composition.
Before the two sheets are continuously impregnated and enter the squeeze roll, the resin is squeezed by a resin squeezing roll so that the resin amount becomes 30%. Three glass non-woven fabric substrates (EP-4035 manufactured by Nippon Vilene Co., Ltd.) having the same shape forming the core layer contained 45 parts by weight of aluminum hydroxide and 30 parts by weight of clay based on 100 parts by weight of the resin of the resin composition. The resin composition was continuously impregnated so that the resin amount was 55%. When impregnated, the glass cloth substrates are arranged on both sides of the three glass nonwoven fabric substrates. The squeeze roll is used to squeeze the resin composition with which the resin-impregnated base material is excessively impregnated. The squeezed resin composition is received and reused in a resin receiving tray arranged between the surface layer base material and the core layer and a resin receiving tray arranged between the core layer and the back layer base material. The resin-impregnated base material integrated with the squeeze roll is then placed between a pair of laminating rolls so that the adhesive side of the copper foil with adhesive having a thickness of 18 μm is placed inside on both sides of the outside. It was continuously fed and laminated at a low pressure to obtain a long strip-shaped laminate. This product is sent to a hardening furnace equipped with a support roll made of stainless steel and heat-cured at a low pressure of 100 ° C for 20 minutes, and then after-cured at 160 ° C for 20 minutes to obtain a copper-clad laminate having a thickness of 1.6 mm. It was

[0016]

According to the present invention, in the method for continuously producing laminated plates, the support rolls provided in the curing furnace can prevent the metal foil and the release film on the surface of the laminated plates from being contaminated and damaged.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention.

FIG. 2 is a cross-sectional view showing a conventional example.

[Explanation of symbols]

 1 Long strip laminated body 2 Support roll 3 Resin receiver

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Claims (2)

[Claims] 1. A required number of resin-impregnated base materials obtained by impregnating a long strip-shaped base material with a resin, and a long metal foil and / or a long release film provided on the upper surface and / or the lower surface thereof. The laminate consisting of and is cured while being continuously moved in a curing oven having a support roll of the same size as or shorter than the width of the laminate, and then cut to the required size to continuously produce a metal foil-clad laminate. A method for manufacturing a laminated board, which comprises manufacturing. 2. The method for producing a laminated plate according to claim 1, wherein a curing furnace in which resin receivers are arranged below both ends of the support roll according to claim 1 is used.