JPH0477662B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a method for manufacturing metal foil-clad laminates, and in particular, impregnation of a plurality of elongated base materials while continuously conveying them, and impregnation of a metal foil laminate. This invention relates to a method for manufacturing metal foil laminates that involves continuous lamination and curing.

Conventional technology A metal foil-clad laminate is made by impregnating a base material such as paper, glass mat, or glass cloth with a thermosetting resin, laminating multiple sheets of this material, and pasting metal foil such as copper foil on one or both sides of the laminated sheet. These laminates are used as printed wiring boards, etc., and conventionally, the manufacturing method for these laminates is to impregnate the base material with resin varnish, dry it, then layer several sheets of prepreg and metal foil and heat them in a press. A batch manufacturing method using pressure molding has been adopted. However, recently, a continuous manufacturing method has been developed in which long substrates are conveyed while being impregnated with resin, laminated, laminated with metal foil, hardened, etc. (See No. 59-55738, etc.) is attracting attention.

These continuous manufacturing methods use curable resins, such as unsaturated polyester resins, which are liquid at room temperature and do not generate gas or liquid by-products during curing.
Epoxy acrylate resin (vinyl ester resin), diallyl phthalate resin, epoxy resin, etc. are used, and base materials impregnated with resin liquid are laminated,
In the case of single-sided lamination, metal foil is laminated on one side and the cover sheet is on the other side, and in the case of double-sided lamination, metal foil is laminated on both sides, and the sheet is passed through a curing oven and cured while being held between them. By the way, when an uncured laminate enters the curing furnace, the resin is still in a fluid state at the beginning of curing, that is, from the laminate roll section to the entrance of the curing furnace, and most of the pressure is applied in the direction perpendicular to the plane of the laminate. As the uncured laminate progresses substantially horizontally, the resin has a tendency to flow toward the ends of the laminate. Therefore, when pasting metal foil on both the upper and lower sides of the base material, the fluid resin flows to both ends of the laminate and if the upper and lower metal foils are made to have approximately the same width, the resin overflows from the lower metal foil and contaminates the surrounding area. Therefore, the metal foil on the lower surface had to be wider than the metal foil on the upper surface.

Problems to be Solved by the Invention The present invention deals with the above-mentioned actual situation, receives the resin overflowing from the end of the lower metal foil, prevents contamination of the surrounding environment, and reduces the width of the lower metal foil to the upper metal foil. The problem was to be able to be made to be almost the same as that of foil, and a solution was found by attaching a narrow belt on which the overflowing resin was placed on the lower side of both ends of the lower metal foil.

Means for Solving the Problems That is, the feature of the present invention that solves the above problems is that in the production of metal foil clad laminates, at least the uncured portion of the resin from the bonded portion to the early stage of curing is A narrow belt with a width slightly overlapping the side edges and protruding slightly outward from the side edges of the metal foil is attached to the lower side of both ends of the lower metal foil, and the belts are pasted together to form a laminate. The point is to make it move in the opposite direction to the direction of travel.

Here, the portions of the narrow belt protruding from both ends of the lower metal foil do not need to be very wide, as long as the resin overflowing from both ends of the lower metal foil can be placed thereon. Usually this belt is 5
A width of ~10cm is sufficient for use.

Further, it is preferable that this belt is attached to the lower side of both ends of the lower metal foil, with as little space as possible between the belt and the metal foil.

It is important that the belt is moved in the opposite direction to the traveling direction of the laminate, but the speed of this transition is determined as appropriate in consideration of the traveling speed of the laminate.
Such high speeds are not required; rather, slower speeds are preferred.

EXAMPLES Hereinafter, specific embodiments of the present invention will be described in detail with further reference to the accompanying drawings.

FIG. 1 shows a specific example of an apparatus implementing the method of the present invention, in which a plurality of long substrates, for example paper 1, are unwound from a roll 2, pre-impregnated in a pre-impregnation bath 3, and dried in a drying chamber 4. The metal foils 7, 7' are then fully impregnated with the curable resin in the next resin-impregnated section 5, and the upper and lower surfaces of the metal foils 7, 7' are coated with adhesive in the laminating roll section consisting of a pair of laminating rolls 6, 6'. The laminated sheet A is laminated together and passed through the curing furnace 8 to form a laminate A, which is then cured and sent to a subsequent process as a hardened laminate A', which is cut into products of predetermined dimensions by a cutter (not shown). Ru.

In the above process, the narrow belt 9 of the present invention is connected to the lower laminating roll 6' and the pulley or roller 10 in the curing furnace 8 between the laminating roll portion and the inlet side of the curing furnace 8. The metal plate 7' is attached to the metal plate 7' on both sides below the lower metal foil 7', and is rotated in a direction opposite to the traveling direction of the laminated plate A.
Note that 11 and 12 in the figure are cover sheets made of polyester film or the like.

FIGS. 2 and 3 are explanatory diagrams that more clearly show the state in which the narrow belt 9 is attached, and the lower metal foil 7'
are provided on the lower side of both ends of the The resin 13 overflowing from both ends is placed on the belt 9 and collected downward by the laminating roll section. As is clear from the figure, the metal foil 7 on the top surface and the metal foil 7' on the bottom surface have the same width, and there is no need to use a particularly wide metal foil on the bottom surface. In this way, the laminates laminated together at the laminate roll section are in an uncured state from the laminate roll section to the middle of the curing furnace 8, and even if the resin overflows from both ends of the lower metal foil due to the tendency of the resin to flow, the laminate will still remain on the narrow belt 9. The overflowing resin is transferred to the laminating roll section, where it is collected by installing an appropriate collection mechanism, and even if the upper and lower metal foils are the same size, the overflowing resin Therefore, there is no possibility of contamination of the surrounding area.

FIG. 4 shows means for mounting the narrow belt 9 coaxially with the lower laminating roll 6'. That is, pulleys 1 are arranged around the shaft 14 at both ends of the roll 6'.
The belt 9 may be mounted between the pulley 10' and the pulley 10 in the curing furnace. In this case, when inserting the cover sheet 11 between the lower metal foil 7' and the laminating roll 6', the width of the cover sheet is narrower than that of the metal foil, and the cover sheet 11 is placed close to the inner edge of the belt 9. Just supply it.

The width of the cover sheet 11 is made slightly narrower than the width of the metal foil 7' so that the contact area of the metal foil 7' with the belt 9 at both edges is made as small as possible.
and by making the diameter of the pulley 10' plus the belt 9 equal to or slightly smaller than the diameter of the laminating roll 6' plus the cover sheet 11,
The coefficient of dynamic friction between the metal foil 7' and the belt 9 moving in opposite directions is so small as to be virtually negligible.

Organic films such as cellophane and polyester films, as well as stainless steel foil and aluminum foil, are used as the cover sheet, but when metal foil is used for the cover, the metal foil is peeled off after curing.

Electrolytic metal foils such as electrolytic copper foil and electrolytic iron foil are preferable as the metal foil used for metal foil lining.
Rolled copper foil, rolled aluminum foil, rolled stainless steel foil, etc. can also be used.

The metal foil used as the metal foil coating may be coated with an adhesive and, if necessary, the coated film may be heat-treated. Furthermore, the adhesive used does not contain solvents or other components that need to be removed, does not substantially generate reaction by-products such as gas or liquid during the curing reaction process, and can be molded under virtually no pressure or low pressure conditions. Something is desirable. For example, adhesives based on unsaturated polyester resins, vinyl ester resins, diallyl phthalate resins, epoxy resins, etc. are preferred.

As the long sheet base material, paper such as linter paper or kraft paper, glass cloth, or glass paper is suitable. Alternatively, glass mixed paper can also be used. When these base materials are used, a strong bond can be formed between the resin and the base material, and a strong product can be obtained. However, the present invention is not limited to these, and well-known fabrics such as asbestos cloth, organic fibers, and nonwoven fabrics can also be applied.

The curable resin liquid must be one that does not substantially generate reaction by-products such as gas or liquid during the curing reaction process, and must be under conditions where the molding pressure during curing is low, especially virtually no pressure. It is preferred that the laminate be produced continuously by the method described above. For example, unsaturated polyester resin, vinyl ester resin, diallyl phthalate resin, epoxy resin, etc. are applicable. Particularly preferred are unsaturated polyester resins, epoxy resins, etc. in terms of quality, cost, ease of manufacture, and the like.

Effects of the Invention As described above, according to the present invention, the belts below both ends of the lower metal foil can catch the resin overflowing from both ends of the lower metal foil and transfer it toward the laminating roll section. , it is possible to prevent contamination of the vicinity from the laminating roll part to the curing furnace inlet side, and even to the part where the resin still has fluidity in the curing furnace, and it is also easy to recover the resin. Furthermore, when attaching metal foil to both the upper and lower surfaces of the base material, it is not necessary to use a wide metal foil on the lower surface, and the same size metal foil can be used on both the upper and lower surfaces, which is a remarkable effect.

Moreover, since the method of the present invention moves the belt in the direction opposite to the direction of travel of the laminate, the overflowing resin at both ends of the metal foil can be cut well, and no overflowing resin remains in the curing stage. At the same time, the coefficient of dynamic friction between the belt and the lower metal foil is relaxed, so that the progress of the laminate is not hindered in any way, and it is expected to be extremely effective in producing laminates covered with metal foil on both sides.

[Brief explanation of the drawing]

Fig. 1 is a schematic diagram showing an example of an apparatus implementing the method of the present invention, Fig. 2 is a perspective view of the main part, Fig. 3 is a sectional view of the main part in the width direction of the laminate, and Fig. 4 is a diagram of a narrow belt. FIG. 3 is a schematic diagram illustrating a method of attaching a pulley coaxially with a laminating roll. 1 is a base material, 5 is a resin-impregnated part, 6, 6' is a laminating roll, 7, 7' is a metal foil, 8 is a curing furnace, 9
1 is a narrow belt, 13 is an overflowing resin, and A is a laminate (uncured).

Claims (1)

[Scope of Claims] 1. A metal foil-clad laminate comprising laminating a metal foil on at least the lower surface of an impregnated base material made of a plurality of base materials impregnated with a curable resin liquid, and then continuously curing it in a curing furnace. In manufacturing the plate, at least from the bonded portion to the initial stage of hardening, a width is formed below both side edges of the lower metal foil, partially overlapping the side edges and protruding slightly outward from the side edges of the metal foil. 1. A method for manufacturing a metal-clad laminate, comprising: attaching a belt and moving the laminated sheet in a direction opposite to the traveling direction of the laminated sheet. 2. The method for producing a metal-clad laminate according to claim 1, wherein the belt width is 5 to 10 cm.