JPS62244637A - 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 continuous production of fiber-reinforced synthetic resin laminates, particularly electrical unclad laminates and single-sided fully-flexed foil-clad laminates.

An unclad laminate made by impregnating a sheet-like base material such as paper, glass cloth, or glass paper with a synthetic resin liquid and laminating multiple sheets of the impregnated sheet-like base material, and a metal foil on one side of the laminate. Metal foil-clad laminates are widely 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 face, the resulting dry brippure lag was layered, and then formed by pressurizing and heating in a press.However, 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 of the present applicant. 56-9
See No. 8136, etc.

In the above continuous method, the plurality of substrates impregnated with the curable resin liquid are laminated with a carrier sheet, such as a polyester film, on the lower surface at the time of or immediately after the combination of the conveyor elements, and are placed on the carrier sheet. The carrier sheet is passed through a curing oven for 1 ffl in this state, and upon exiting the curing oven, the carrier sheet is peeled off before cutting the laminate. The carrier sheet thus undergoes a curing process until it becomes self-supporting.
It is also a means of transporting the R plate, but also serves to protect the uncured laminate from contact with the atmosphere and transport rolls in the curing furnace, and to form the lower surface of the Mt laminate into a smooth surface.

Carrier sheet 1 must be peeled off from the cured laminate; however, the carrier sheet often adheres strongly to the cured laminate, requiring a large amount of force to peel off the carrier sheet, and if you try to forcefully peel it off, the laminate will peel off. Some inconveniences have been experienced, such as part of the surface resin layer peeling off and the laminate being damaged, or the carrier sheet being torn or locally stretched and deformed, making reuse impossible.

The present invention eliminates these disadvantages and provides a method that facilitates the peeling of a carrier sheet from a laminate cured by a continuous process.

The present invention involves impregnating a plurality of sheet-like base materials with a curable resin liquid while continuously conveying them, laminating the impregnated base materials, and laminating a carrier sheet on at least one side of the laminated impregnated base materials.
Provided is a method for continuously manufacturing a laminate in which curing is performed continuously, the method comprising continuously peeling the carrier sheet from the cured laminate while maintaining the carrier sheet at a temperature of 50° C. or higher. do.

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 base materials are shown to be conveyed at the same time, but it goes without saying that the number of nine base materials can be increased or decreased as appropriate depending on the final thickness of the laminate. The substrate 2 then enters the resin liquid impregnation chamber 4, is impregnated with the resin liquid, passes between a pair of squeeze rolls 5.5, and is combined. At this time, a metal foil 8 unwound from the roll 7 is coated with adhesive and laminated on the upper surface of the laminate of impregnated substrates, and a carrier sheet 10 unwound from the roll 9 is placed on the underside of the laminate. For example, polyester films are laminated together by rolls 5. In the case of the Unclad & JN board, a carrier sheet is also used on the top surface instead of the metal foil 8 and is similarly peeled off after curing.

The uncured laminate thus obtained enters the curing furnace 12, where it is heated and cured while traveling therein. The carrier sheet 10 is peeled off from the laminate 14 leaving the curing furnace 12 by a roll 13, and then the carrier sheet 10 is peeled off by a roll 11.
It is wound up as.

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 shown in Japanese Patent Laid-Open Nos. 55-4838 and 56-98136, both of which were filed by the present applicant and cited above.

According to the present invention, when the carrier sheet 1O is peeled off by the roll 13 from the laminate 14 that has left the curing furnace 12, the carrier sheet is kept at a temperature of 50° C. and is continuously peeled off. In the curing oven 12, the laminate and carrier sheet are heated to a temperature of about 1004°C to 150°C2, e.g.
Heated to 20°C. Therefore, the outlet of the curing furnace 12 and the peeling roll 13 should be brought close to each other so that the temperature of the carrier sheath 410 integrated with the laminate 14 does not drop below 50°C before reaching the peeling roll 13, or the hot air 20 should be placed between the The temperature of the carrier sheet is increased to 5.
It is effective to keep the temperature above 0°C.

Although the upper limit is not necessarily fixed, it is conveniently, for example, below the curing temperature, preferably below 80°C.

The temperature of the carrier sheet during peeling in this way is 5.
If the temperature is 0°C or higher, the force required for peeling is small, and the advantage is that peeling of the laminate surface and damage to the carrier sheet are virtually avoided due to the strong adhesive force between the carrier sheet and the cured resin. can get.

Although the specific example shown is for a single-sided metal foil-covered laminate, it is obvious that the present invention can also be applied to unclad laminates when peeling the top carrier sheet from the cured i&laminate. Dew.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic side view of an apparatus for carrying out the method of the invention.

Claims (1)

[Claims] A laminate in which a plurality of sheet-like base materials are impregnated with a curable resin liquid, laminated with a curable resin liquid, laminated with a carrier sheet on at least one side of the laminated impregnated base materials, and cured while continuously conveying a plurality of sheet-like base materials. A method for continuous production of a laminate, characterized in that the carrier sheet is continuously peeled from the cured laminate while maintaining the carrier sheet at a temperature of 50° C. or higher.