JPS6144640A - Method of preventing fouling of lower-surface metallic foil in manufacture of metallic-foil lined 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 manufacturing a metal foil-clad laminate, in particular impregnation of the base material while continuously conveying a plurality of long base materials, lamination of the metal foil, The present invention relates to a method for preventing the lower metal foil from being soiled by resin overflowing from both ends of the lower metal foil in a continuous curing method.

■Metal foil laminate in which a base material such as paper, glass mat, or glass cloth is impregnated with thermosetting resin, and multiple sheets are laminated and metal foil such as copper foil is laminated on one or both sides. Boards are used as printed wiring boards, etc., but conventionally,
These laminates have been manufactured using a batch method in which the base material is impregnated with resin face, dried, and then several pieces of buripurerug and metal foil are stacked and molded under heat and pressure in a press. .

However, recently, a continuous manufacturing method has been developed in which resin impregnation, lamination, metal foil lamination, curing, etc. are carried out while conveying a long base material (Japanese Patent Application Laid-open Nos. 55-4838 and 57-57).
626, 59-55738, etc.).

These continuous manufacturing methods produce curable resins that are liquid at temperature as impregnated resins and do not generate gas or liquid byproducts during curing.
For example, unsaturated polyester resin, epoxy acrylate resin (vinyl ester resin), diallyl phthalate resin,
Epoxy resin or the like is used, and the base materials impregnated with resin liquid are laminated, and in the case of single-sided lamination, metal foil is placed on one side.
A cover sheet is placed on the other side, and in the case of double-sided lamination, metal foil is pasted on both sides, and the sheet is passed through a curing oven while being sandwiched between them, and is cured substantially without pressure.

By the way, when an uncured laminate enters the curing oven, the resin is still in a fluid state at the beginning of curing, that is, from the laminating roll section to the entrance of the curing oven, and the laminate is subjected to almost no pressure in the direction perpendicular to the plane of the laminate. If not, the resin tends to flow toward the ends of the laminate as the uncured laminate advances substantially horizontally. Therefore, when attaching metal foil to both the upper and lower surfaces of the base material, the fluidized resin will flow to both ends of the laminate and if the upper and lower metal foils are made to have approximately the same width, the resin will overflow from the lower metal foil, and this will cause the resin to overflow from the lower metal foil. There is a problem in that the foil moves to the back side of the foil and contaminates the lower full-pressure foil surface, leading to a deterioration in the quality of the product itself.

, B ("-1"), Q Shiraki's invention, in view of the above-mentioned circumstances, utilizes adhesive tape on both ends of the lower metal foil to prevent the resin from overflowing from both ends of the lower metal foil. This is intended to prevent the lower metal foil itself from becoming contaminated.

In other words, a feature of the present invention is that, in the production of the metal foil-clad laminate, the lower surface of the uncured laminate is removed over a certain length from at least the bonded portion of the uncured laminate until the initial stage of curing. The purpose is to attach adhesive tapes to the upper and/or lower surfaces of both ends of the metal foil with a width extending slightly outward from both ends of the metal foil.

In this case, the adhesive may be attached in advance to the upper or lower surface of both ends of the lower metal foil, or to both the upper and lower surfaces, with the required overlapping parts, or when laminated together, it may be attached at the same time by leaving a gap between the feeding of the lower metal foil. It may also be sent in and attached.

In addition, the adhesive tape may be determined so as to prevent the uncured resin overflowing from both ends of the lower metal foil from going around to the back side of the lower metal foil; for example, a tape having a value of about 5 to 1 O is sufficient. .

The overflowing resin is then collected on an adhesive tape or passed through a curing oven, and then removed by peeling off the tape or trimming the metal foil.

Incidentally, when a cover sheet made of polyester film or the like is used on the lower surface of the lower metal foil, the adhesive tape can be attached to the cover sheet at a required position in advance and attached to the metal foil.

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

FIG. 1 is a perspective view of an example of a state in which the method of the present invention is implemented, and FIG. 2 shows an outline of a laminate manufacturing apparatus that implements the method.

Now, in FIG. 2, a plurality of long substrates, for example paper 1, are unwound from a roll 2, passed through a preliminary gold dipping bath 3, a drying chamber 4, and then sufficiently impregnated with the curable resin in the next resin impregnation section 5. In the laminating roll section consisting of a pair of laminating rolls 6.6'', each sheet of metal foil 7,7'', such as copper foil, coated with adhesive on both its upper and lower surfaces is laminated to form a laminate A, which is then sent to the curing furnace 8. The laminate A°, which is cured during the passage, is sent to a subsequent process as a cured laminate A°, and cut into products of predetermined dimensions by a cutter (not shown).

In the above process, a portion of the adhesive tape 9 is required at the side end of the metal foil 7° on the lower side between the laminating roll part and the uncured part of the first half of the curing furnace 8, as shown in FIG. It is attached by polymerizing the width.

Although only one side of the adhesive tape 9 is shown in the figure, it is attached to both ends of the lower metal foil 7'. Further, although it is attached to both the upper and lower surfaces of the lower metal foil 7', it may be attached to only one of the upper and lower surfaces.

It should be noted that the adhesive tape 9 may be applied when the lower metal foil 7 is wound around the roll, but if adhesive is to be applied, the adhesive tape 9 may be applied at the same time as the lower metal foil is fed into the laminating roll. It is practical to send and attach adhesive tape.

In the figure, reference numerals 10 and 11 are each cover sheet made of polyester film or the like.

In this way, the impregnated base material and the upper and lower double-sided metal foils 7,7'' are combined at the laminating roll section to form the laminate A, which is sent to the curing furnace 8, but the laminating section is in the early stage of curing in the curing furnace. Up to the inlet side, the resin 12 is in an uncured state and has a tendency to flow, and as a result, the resin 12 flows and tends to overflow from the side edge of the lower metal foil 7°.

However, since the adhesive tape 9 is attached to both ends of the lower metal foil at this time, the resin remains on the adhesive tape 9 and does not reach the back side of the lower metal foil, and the resin does not reach the bottom metal foil 7''.
Contamination of the back side of is prevented.

As a cover sheet, cellophane or polyvinless foil,
Aluminum foil or the like is used, but if metal foil is used for the cover, the metal foil is peeled off after curing.

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

The metal foil used as the metal foil covering 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.

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, and that can be used under conditions where the molding pressure during curing is low, especially virtually no pressure. It is preferred that laminates be produced continuously by the method described above. For example, unsaturated polyester resin, vinyl stellate resin, diallylphthale-1
Unsaturated polyester resins, epoxy resins, etc. are particularly preferred from the viewpoint of low quality, cost, ease of production, etc.

As described above, the present invention attaches adhesive tape to both ends of the lower metal foil in a certain length portion of the uncured laminate,
Even if the resin overflows from the side edge of the lower metal foil due to the tendency of the uncured resin to flow, the adhesive tape will stop the resin from flowing out, and the adhesive tape and the side edge of the lower metal foil will Since no gap is formed therebetween, the resin does not flow to the back surface of the lower metal foil, and staining of the lower metal foil by the bathed resin can be reliably prevented.

In addition, since the adhesive tape absorbs the bathed resin as described above, even when applying metal foil on both sides, there is no need to make the lower metal foil wider than the upper metal foil, and it is possible to use the same size metal foil on both the upper and lower surfaces. possible. Note that since the bathing resin is retained on the adhesive tape, it can be easily removed by peeling off the tape.

[Brief explanation of the drawing]

FIG. 1 is a partial perspective view showing one embodiment of the method of the present invention;
2- is a schematic diagram showing the manufacturing process of a metal foil-clad laminate using the same method. 1 is a base material, 5 is a resin-impregnated part, 6.6 is a laminating roll, 7 is a top metal foil, 7 is a bottom metal foil, 8 is a curing furnace,
9 is an adhesive tape, 12 is a resin, and A is an uncured laminate. Patent applicant Kanebuchi Chemical Industry Co., Ltd., agent
Patent attorney Taku Akaoka□゛, husband. Figure 1

Claims (1)

[Claims] In the production of metal foil-clad laminates, which consist of a plurality of substrates impregnated with a curable resin liquid, a metal foil is laminated on the lower surface of the impregnated substrate and continuously cured in a curing furnace. The uncured laminate is conveyed while maintaining a substantially flat surface, and the metal foil is applied to the upper and/or lower surfaces of both ends of the lower metal foil over a certain length from the bonded portion to the initial stage of curing. A method for preventing contamination of a lower metal foil in the production of a metal foil-clad laminate, characterized in that adhesive tape is attached with a width extending slightly outward from both ends of the metal foil.