JPS60264246A - Continuous manufacture of laminated board for electricity - 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 continuous manufacturing method for electrical laminates.

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 a resin press, dried, and then the resulting buri presoge was layered and formed by pressurizing and heating with 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 base materials impregnated with a curable resin liquid are conveyed and combined, and, for example, a copper foil is pasted on the top surface of the combined laminate and a carrier sheet is pasted on the bottom surface. In this case, the excess resin liquid protrudes from the edges of the laminate, contaminating the curing oven, flowing to the underside of the carrier sheet, and adhering to the conveyor rolls in the curing oven, causing other problems. Therefore, it is necessary to use a carrier sheet that is wider than the laminate of the impregnated base material, to trap the protruding resin at both ends of the carrier sheet, and to supply a band-shaped resin absorbing material close to the edge of the laminate of the base material. (Refer to Japanese Patent Application Laid-Open No. 57-57658). However, in these methods, the resin that protrudes ends up being cured at the same time as the laminate, and cannot be reused.

Therefore, in the continuous method, the present invention actively collects the excess resin liquid protruding from the laminate of impregnated base materials before curing, thereby making it possible to reuse the resin liquid, and to cure the resin liquid by the resin liquid. The purpose is to prevent contamination of furnace parts.

The present invention involves impregnating a curable resin liquid while continuously conveying a plurality of sheet-like substrates, laminating the impregnated substrates, and applying metal foil and/or a carrier sheet to the upper and lower surfaces of the laminated impregnated substrates. In a continuous manufacturing method for electrical laminates in which lamination and curing are performed continuously, the laminate of an impregnated base material with metal foil and/or carrier sheet laminated on the top and bottom surfaces may protrude from both edges of the laminate before curing. The method is characterized in that at least a portion of the cured resin liquid is recovered.

FIG. 1 is a schematic side view of an example of an apparatus for carrying out the method of the invention.

A base material, for example kraft paper 2 made of cellulose fibers, wound around a roll 1 is continuously conveyed and enters a pretreatment chamber 3 . 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 substrate 2 then enters a resin liquid impregnation chamber 4, is impregnated with a resin liquid, passes between a pair of squeege rolls 5.5, 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 impregnated base materials, and the carrier sheet 103, for example, a polyester film fed out from the roll 9, is placed on the bottom surface of the laminate. They are pasted together by a roll 5. In the case of an unclad laminate, a carrier sheet is used instead of the metal foil 8, and in the case of a double-sided metal foil laminate, a metal foil is used instead of the carrier sheet 10, and the metal foil is not peeled off after curing. The uncured laminate thus obtained enters the curing furnace 12, where it is heated and cured while traveling therein. If necessary, the carrier sheet 10 is peeled off from the laminate 14 leaving the curing oven 12 by a roll 13 and wound up as a roll 11. The drawing shows the manufacture of a single-sided metal foil-clad laminate;
In the case of a double-sided metal foil-covered laminate, a metal foil is used instead of the carrier sheet 10 and is not peeled off by the rolls 13.

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. This device is substantially the same as that disclosed in Japanese Patent Laid-Open Nos. 55-4838 and 56-98136 of the same applicant cited above.

2 and 3 are a perspective view and a cross-sectional view of the laminate just before it passes between the metal foil and carrier sheet laminate rolls 5.5 and enters the curing furnace 12 in FIG. Resin liquid 2 squeezed out between .5
0 protrudes from both sides and accumulates on the carrier sheet 10.

4 and 5 illustrate a specific example of a method and apparatus for recovering the protruding resin liquid 20 from above the carrier sheet 10. This is done by a blade 22 that is inclined inward at an angle θ from the downstream side to the upstream side in the conveyance direction of the object.

The tip end 23 of the blade 22 has a low height, and even a part of the protruding resin 20 filling the space between the copper yM8 and the carrier sheet 10 can be recovered. In this specific example, the laminate is continuously I in the direction of the arrow.
I! ! As it is conveyed, the spilled resin liquid 20 is scraped off by the blade 22 and moves along the blade 22 to the outside of the carrier sheet, from where it flows down and is collected in a prepared container 21. The angle of inclination θ of the blade 22 with respect to the conveying direction of the laminate is preferably about 30° to 60°.

The specific example shown in FIG.
A first blade 24 having a smaller angle of inclination than the second blade 26 is provided upstream of a second blade 26 similar to the blade 22 of the embodiment of FIGS. 4 and 5. , protruding cedar) The outward flow of the fat liquid 20 is made gentle.

In the specific example shown in FIG. 7, the blades 21:...
, 8 has a V-shape having an inclined part corresponding to the specific example (7) 7' L/- door 20 in FIGS. The overflowing resin liquid 20 that accumulates between the inclined portion and the parallel portion is continuously collected by a pipe 30 and a pump 32 into a container (not shown).

The specific example shown in FIG. 8 is basically the same as the specific example shown in FIG. 30 into a container (not shown), or
Or suction with a pump.

The embodiment of FIGS. 9 and 10 differs from the previous embodiments in that it uses a reverse roll 34 located close to the top surface of the carrier sheet 10. This roll 34 is driven in a direction opposite to its traveling direction on the side in contact with the carrier sheet 10, so that some of the protruding resin liquid adheres to the outer periphery of the roll 34, and is scraped off by a blade 36 provided in contact with the roll 36. and collected in the container 38.

Of course, the recovery devices shown in FIGS. 4 to 10 are provided on both sides of the stack. Further, their installation position is between the laminating roll 5.5 and the inlet of the curing furnace 12 in FIG.

Furthermore, in the illustrated example, when the protruding resin liquid 20 is scraped off all at once with a single blade 22 as in the example shown in FIGS. 4 and 5, the resin liquid near the tip of the blade 22 becomes copper? overflows onto 1ifB,
Since this may stain the resin, it is preferable to guide the overflowing resin liquid to the outside in two stages as in the specific example shown in FIG. Furthermore, in the specific examples shown in FIGS. 9 and 10, the amount of resin liquid recovered can be adjusted by changing the relative speed between the reverse roll 34 and the carrier film 10. Furthermore, in this specific example, especially the reverse roll 34
By chamfering the inner corners of the carrier sheet 10, the roller 34 is moved along the carrier sheet 10 so that the seam between the carrier sheet 10 and the copper foil 8 is not obstructed as it passes.
The resin liquid can be sufficiently recovered.

[Brief explanation of the drawing]

Fig. 1 is a schematic side view of a continuous laminate manufacturing apparatus for carrying out the method of the present invention, Figs. 2 and 3 are perspective views and cross-sectional views of the laminate before curing, and Figs. 4 and 5. 6 to 8 are plan views of other specific examples of the recovery device using blades, and FIGS. 9 and 10 show a reverse roll. FIG. 2 is a plan view and a side view of a used resin liquid recovery device. 5 is a laminating roll, 12 is a curing furnace, 8 is a copper foil, 10
is a carrier sheet, 20 is a protruding resin liquid, 22, 24
．． ．． 26 and 28 are blades, and 34 is a reverse roll. 0

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, and applying metal foil and/or In a continuous manufacturing method for electrical laminates in which carrier sheets are pasted together and cured continuously, metal foil and/or metal foil are applied to the top and bottom surfaces.
Or continuous production of electrical laminates characterized by recovering a small amount (or a portion) of the curable resin liquid protruding from both edges of the laminate before curing the laminate of impregnated base materials laminated with a carrier sheet. Method. (2) The curable resin liquid is recovered by scraping off the curable resin liquid that has protruded onto the carrier sheet or metal foil with a blade located close to the upper surface of the lower metal foil or carrier sheet. The method of item 1 is performed. (3) The method of item 2, wherein the blade has a portion that slopes inward from the downstream side in the +U feeding direction of the laminate toward the 1-stream side. (4) The method of item 2. The liquid collection is located close to the top surface of the lower gear rear sheet or metal foil and
l! The method according to item 1, which is carried out by applying a curable resin liquid to the outer circumferential surface of a roll rotating in a direction opposite to the feeding direction and scraping it off.