JPS5887053A - Continuous manufacture of 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 continuously manufacturing a laminate, such as a metal-clad laminate.

There are the following methods for manufacturing metal-clad laminates such as copper-clad electrical insulating boards. That is, unsaturated resins having unsaturated bonds such as unsaturated polyester resins, diallylphthalate resins, vinyl ester resins, etc. are diluted with vinyl nitrate (crosslinking agent), and a polymerization initiator is further added to form unsaturated resins. A resin-impregnated base material is created by making phenol and impregnating it into paper or other base material. Next, multiple layers of this resin-impregnated base material are stacked,
Furthermore, a metal-clad laminate is produced by overlaying adhesive-coated copper foil or other metal foil on at least one of the front and back surfaces of this laminate, and then heating it under no pressure. In this method, continuous production is possible because the laminate is heated and cured without pressure, without applying heat and pressure to cure the laminate one by one. In addition, when producing unsaturated resin pheno, the unsaturated resin is not diluted with a solvent, but is diluted with a crosslinking agent to create pheno, so there is no need to use a solvent, which is advantageous in terms of resource saving, etc. ing.

Not limited to this method, when attempting to continuously manufacture metal-clad laminates, it is possible to pre-cure the adhesive layer provided on the metal foil, or to fully cure the synthetic resin component of the resin-impregnated base material. After the main curing, the product is necessarily subjected to post-curing (after-curing). Conventionally, this was done by using hot air as a heat source, which took several minutes to several tens of minutes for curing, which was one of the reasons for hindering speed improvements in the production line.

As a result of the curing time required, the problem arises that the space occupied by the thermosetting furnace increases. For example, when making double-sided copper-clad laminates, the building for the large curing furnace is three stories high, and the effective height of the factory building is It was even several meters long. Since the energy efficiency is poor and the heating load on the furnace body reaches 20 to 30 inches, there are also problems from the point of view of energy saving. Furthermore, heat curing causes the temperature of metal foil such as copper foil to drop significantly, which not only impairs the surface smoothness of the product, but also causes quality problems such as problems with heat resistance.

The inventors have made various efforts to solve these problems. As a result, it has been found that these problems can be solved by curing the synthetic resin component by irradiation with electron beams. When irradiating with an electron beam,
There is a scanning method in which electrons generated from a cathode are accelerated through a linear accelerator so that they have the necessary energy, and then are swung to produce the necessary width for processing. There is a method called the curtain type, which uses rain to illuminate the area. Among these, the curtain type type requires a low voltage and is convenient, but its low energy limits the irradiation depth and thickness, which limits its uses.

On the other hand, with the scanning type that uses high voltage, the plate thickness is 1 mm.
Even thick laminates can be cured. Therefore, the inventors decided to adopt this scanning type.

In this way, the continuous method for producing a laminate according to the present invention includes the step of continuously supplying and overlapping a plurality of sheet materials including a resin-containing sheet material to continuously obtain a laminate; This is a method for continuously obtaining a laminate by curing the synthetic resin component of the laminate, and is characterized in that the curing of the synthetic resin component is performed by scanning irradiation with an electron beam.

Next, this will be explained in detail.

In this invention, the resin-containing sheet material is an unsaturated polyester resin, a sialoluphthalate resin.

A resin phenol or other varnish made by diluting an unsaturated resin with unsaturated bonds such as vinyl ester resin with a crosslinking agent such as vinyl ester resin, and adding a polymerization initiator and other necessary additives if necessary, is made into paper. , refers to resin-impregnated base materials made by impregnating cloth, glass cloth, or other base materials, or those made by stacking the required number of resin-impregnated base materials, as well as resins whose main component is unsaturated polyester resin or other synthetic resin. It refers to a synthetic resin sheet made by thinly extruding the composition, etc., or a sheet made by alternately overlapping the required number of synthetic resin sheets of mochi dahoko and the base material of track C.

In this invention, a plurality of sheet materials made only of this resin-containing sheet material are continuously supplied and overlapped to continuously obtain a laminate, or one or more of these resin-containing sheet materials are coated with copper foil. It involves the process of continuously supplying and overlapping a plurality of sheet materials made by adding one or more sheets of metal foil to continuously obtain a laminate. Specifically, this step is performed as follows, for example.

As shown in FIG. 1, a pair of upper and lower rolls 1.1
A plurality of resin-impregnated base materials 2... are continuously supplied to the slits between them, and a stacked body 3 of resin-impregnated base materials is continuously produced. This stacked body 3 is continuously supplied to a slit between a pair of upper and lower laminating rolls 4.4.

On the other hand, copper foil 5 coated with a synthetic resin adhesive is continuously supplied to the slit between the laminating rolls 4 and 4 so as to overlap the surface of the stacked body 3.
A release film 6 is also continuously supplied so as to be superimposed on the back surface of the mold. When producing a double-sided copper-clad laminate, an adhesive-coated copper foil 5 is supplied in place of the release film 6.

The adhesive synthetic resin layer interposed between the resin-impregnated base material stack 3, that is, the substrate material containing synthetic resin, and the copper foil, that is, the metal foil, is usually formed by adhering it to the metal foil in advance as described above. However, it may be formed by adhering to the substrate material, and if the synthetic resin component contained in the substrate material has adhesive properties, it may be used.

In this way, after layering the metal foil on the substrate material to obtain the laminate 7, the synthetic resin components, that is, the synthetic resin contained in the substrate material, the synthetic resin of the ridge, and the space between the substrate material and the metal foil are A metal-clad laminate is continuously obtained by curing the adhesive synthetic resin interposed therein. Preceding statement 1 When the metal foil is not superimposed on the overlapping body 3, the overlapping body 3
The laminate is continuously obtained by passing through a curing process.

In this way, in the present invention, a laminate consisting only of a stacked body 3 of a plurality of resin-impregnated base materials, or a laminate consisting of a layered layer of Kinho foil on top of each other, is continuously fed and subjected to a curing process. A laminate is continuously obtained through this process, and the curing process is characterized by being performed by scanning electron beam irradiation.

Specifically, scanning irradiation with an electron beam is performed as follows, for example. FIG. 2 shows an example of a single-scan type 'Koji beam irradiation furnace. Inside the furnace 8, the laminate 7 is continuously transported by feed rolls (not shown) or the like.

On the ceiling of the furnace 8, the electrons generated by the electron beam irradiation device 9 are placed in an acceleration tube 11 or a laser scanner 12. It pours down onto the laminate 7 through the window 10 while scanning its surface. If the presence of acid buildup is likely to inhibit curing, the air in the furnace 8 is replaced with an inert gas such as N2.

By this electron beam irradiation, the synthetic resin component of the laminate 7 is rapidly cured. The above-mentioned electron beam irradiation device is provided on either the upper or lower side of the integrated transfer path. In this case, pre-curing of the adhesive applied to the metal foil is not necessarily necessary, and after-curing is also usually not required.

This invention is constructed like a queen, and the curing process for the laminate is performed by scanning irradiation with an electron beam. According to this invention, the curing process for thick laminates is also possible. Become.

For example, when using a 7501 cV scanning device, even a 1.6 mm thick product (9 steel foils on one side, 5 layers of paper) can be cured. Moreover, the curing speed becomes faster and the curing time can be shortened. Therefore, the installation space (height) of the curing furnace is reduced to about half, the line speed is improved, and the productivity of laminated plates is increased. Energy efficiency increases, making it possible to save energy. Since the temperature rise of copper foil and other metal foils is extremely small, the adverse effects of heat on the dimensions and shape of the laminate, such as foil elongation and wrinkles, are reduced or eliminated. 1 - Therefore, the surface smoothness and other quality of the product,
, I: can be calculated. Conventionally, it was necessary to add a reaction initiator to adhesives, but electron beam irradiation eliminates the need for it, which not only extends the life of the resin, but also simplifies equipment and operations, improving workability. When producing a single-sided metal-clad laminate, electron beam irradiation is also used to coat the resin gel coat on the release film that is stacked on the back side. Electron beam irradiation is also effective when making decorative boards.

[Brief explanation of drawings]

FIG. 1 is a schematic explanatory view of the laminate manufacturing process in the continuous laminate manufacturing method according to the present invention, and FIG. 2 is a perspective view of an electron beam irradiation furnace. 3... Resin-impregnated base material as a resin-containing sheet material 4... Laminate roll 5... Sheet 4t & copper foil with adhesive 7... Laminate 8... Furnace 9... Electron beam irradiation device 10...Window 11...Acceleration tube 12...Scanner Patent applicant Matsushita Electric Works Co., Ltd. Agent Patent attorney Takehiko Matsumoto

Claims (1)

[Claims] (1) Includes a step of continuously supplying and overlapping a plurality of sheet materials including resin-containing sheet materials to continuously obtain a laminate, and curing the synthetic resin component of this laminate to form a laminate. 1. A method for continuously producing a laminate, characterized in that a synthetic resin component is cured by scanning irradiation with an electron beam.