JPS60260327A - 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.

A laminate made of paper, glass cloth, glass paper, etc. as a base material, laminated with multiple resin-impregnated base materials impregnated with a resin liquid, and cured, and a metal foil on one or both sides of the laminate. Metal foil laminates are used as insulating boards and printed wiring boards.

Conventionally, these laminates were manufactured using a batch method in which the base material was impregnated with resin face, dried, and then the resulting buri pressoge was piled up and formed by pressurizing and heating in a press, but recently, long base materials have been A continuous method has been developed that performs resin impregnation, lamination, curing, etc. while continuously conveying, and is attracting attention. For example, Japanese Patent Application Laid-Open No. 55-4838 by the present applicant. 56
See No.-98136, etc.

In the continuous method described above, a plurality of substrates impregnated with a resin liquid are conveyed and combined, and a metal foil and/or a carrier sheet is laminated to the combined laminate using a laminating roll. Excess resin liquid is then squeezed out of the impregnated substrate and spread outwards on the laminate-supporting side of the carrier sheet.

For this reason, the carrier sheet should be wider than the base material to prevent the protruding resin liquid from spreading beyond the edge of the carrier sheet and staining the opposite side of the carrier sheet and the conveyance rolls etc. that come into contact with it. is preferred.

However, the parts of the carrier sheet that come into contact with the protruding resin liquid are easily deformed, and the resin that has adhered to these parts of the carrier sheet is removed from the opposite side of the carrier sheet when the carrier sheet is wound up for reuse at the exit side of the curing furnace. and stain the carrier sheet.

The present invention aims to eliminate the above-mentioned drawbacks.

The present invention continuously carries out impregnation with a curable resin, lamination of the impregnated base materials, lamination of a metal foil and/or carrier sheet onto the laminate, and curing while continuously conveying a plurality of sheet-like base materials. The continuous manufacturing method for laminates is characterized in that adhesive tapes are continuously laminated to both ends of the laminate supporting surface of the carrier sheet at least before lamination of the carrier sheet to the impregnated base material laminate.

The width and lamination position of the adhesive tape are selected such that its inner edge overlaps the edge of the impregnated substrate and its outer edge covers at least the area on the carrier sheet where the resin liquid protruding from the substrate spreads. is preferable.

FIG. 1 is a schematic side view of an example of an apparatus for producing a single-sided metal foil-clad laminate by carrying out the method of the present invention.

A base material, for example, kraft paper 2 made of cellulose fiber, is wound around a roll 1 and is continuously conveyed to a pretreatment chamber 3.
to go into. In the drawing, three substrates are shown to be conveyed at the same time, but it goes without saying that the number of substrates can be increased or decreased as appropriate depending on the final thickness of the laminate. The base material 2 then enters the resin liquid impregnation chamber 4, where it is impregnated with resin liquid and is then placed between a pair of squeegees.
It passes between Growl 5 and 5 and is combined. At this time, the metal foil 8 fed out from the roll 7 is coated with adhesive and laminated on the top surface of the laminate of the impregnated base material, and the carrier sheet fed out from the roll 9 is placed on the bottom surface of the laminate.
10. Example EVA polyester film is laminated by roll 5. The uncured laminate thus obtained enters the curing furnace 12, where it is heated and cured while traveling therein. The lower carrier sheet 10 is transferred from the laminate 14 leaving the curing furnace 12 to the roll 13.
The film is peeled off and wound up as a roll 11. Next, the laminate 14 is trimmed at both ends by a rotary cutter 18, and cut to a required length by a guillotine cutter 19. The previous parts of this device are disclosed in Japanese Patent Application Laid-open No. 55-4838 and No. 56-56 of the present applicant cited above.
It is substantially the same as that disclosed in No. 98136.

In the production of unclad laminates, a carrier sheet is also used on the upper surface of the laminate of impregnated substrates, and in the case of double-sided cladding, a metal foil is also used as a carrier sheet on the lower surface, so that it does not peel off after curing.

Figure 2 shows the curing furnace 1 after passing through the laminating rolls 5, 5.
FIG. 2 is an enlarged perspective view of a laminate about to undergo curing in FIG. At this time, a metal foil 8 is laminated on the upper surface of the laminate 20 of the impregnated base material 2, and a carrier sheet 10 is laminated on the lower surface.

According to the present invention, when the carrier sheet 10 is attached to the laminate 20, the adhesive tape 22 is supplied between them. The adhesive tape 22 is preferably made of plastic film, cellophane or paper with the same shrinkage factor as the carrier sheet. The adhesive tape 22 has its adhesive layer facing the support surface of the carrier sheet 10 and its inner edge 26
is applied to both ends of carrier sheet 10 such that it overlaps a portion of base layer 20 and outer edge 28 extends to or near the outer edge of carrier sheet 10 .

The method and apparatus for pasting the adhesive tape 22 onto the carrier sheet 10 are disclosed in Japanese Patent Laid-Open No. 57-576 by the present applicant.
Methods and apparatus similar to those described in No. 58 can be used.

In this way, the adhesive tape 22 is attached to both ends of the carrier sheet 10.
By pasting them together, the laminate 2° becomes the roll 5, 5
The resin liquid 24 squeezed out when passing through the gap contacts the adhesive tape 22 and does not contact the carrier sheet 10.

The adhesive of the adhesive tape 22 is preferably a pressure-sensitive adhesive, so that the carrier sheet 1
0 is peeled off by the roller 13 and wound up,
A portion of the tape 22 overlaps the substrate layer 20 so that the tape 22 is retained on the laminate 14 and peeled from the carrier sheet.

According to the present invention, the adhesive tape 22 prevents the overflowing resin liquid 24 from adhering to the carrier sheet 10, thereby preventing deformation and staining of the carrier sheet in this area and consequent staining inside the curing oven. It can be prevented.

[Brief explanation of the drawing]

FIG. 1 is a schematic side view of the entire apparatus for carrying out the method of the present invention, and FIG. 2 is a partially enlarged perspective view of a laminate in the curing process. 8 is a metal foil, 10 is a carrier sheet, 20 is a base material layer, 2
2 is an adhesive tape.

Claims (1)

[Claims] (11 Impregnating a plurality of sheet-like base materials with a curable resin liquid while continuously conveying them, laminating the impregnated base materials, laminating a metal foil and/or a carrier sheet to the laminate, and In a continuous manufacturing method for laminates in which curing is performed continuously, adhesive tape is continuously laminated to both ends of the laminate supporting surface of the carrier sheet, at least by the time of laminating the carrier sheet to the impregnated substrate laminate. (2) The width and lamination position of the adhesive tape are such that its inner edge overlaps the edge of the impregnated base material, and its outer edge overlaps at least the resin liquid protruding from the base material. 2. The method of claim 1, wherein the area on the carrier sheet is covered with a spreadable area.