JPH03150161A - Manufacture of laminate and its device - Google Patents

Abstract

PURPOSE:To enhance the yield of product, while the product having a uniform thickness to its and are formed by a method in which the long sheetlike base materials impregnated with resin are fed, and then the base materials are pressurized through belts and gaskets. CONSTITUTION:The base materials 4 impregnated with resin are fed between endless belts 3, 3, an the endless belts 3, 3 are heated and pressurized with a heating and pressurizing device 2. The gaskets 5, 5 made of elastic object are arranged at both sides of the base material 4, and the gaskets 5, 5 are fed at the same speed as that of the endless belts. Pressure is applied to the gaskets 5, 5 from on oil pressure-device 7 through rigid beltlike objects 6, 6. When the constituting number of the base materials is large, their end parts becomes uneven, whereby the base materials are not brought in contact with one another wholly, and since small gaps remain, notches 8 are provided at the end parts of the base materials so as to weaken the toughness of the end parts of the base materials. The gaskets are brought in close contact with both sides of the base materials, and the base materials are continuously pressurized and formed, therefore small gaps do not occur between the base material and the gaskets, and the resin is prevented from flowing out.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a method and apparatus for continuously manufacturing a laminate in which base materials impregnated with a curable resin are laminated and heated under pressure.

Such laminates have important uses as electrical insulating boards and metal foil-clad laminates, but are not limited to these.

[Conventional technology]

Previously, #Isui! The I-plate was produced by impregnating a base material with resin, drying it, and cutting it into predetermined dimensions, and heating and pressing the prepreg in a flat plate multi-stage press. In this method, when the resin is in a fluid state before curing.

Because the liquid flowed out from the four sides of the base material, the peripheral area did not have the specified thickness, resulting in poor product yield.

Therefore, a method has been developed in which long prepregs or substrates impregnated with resin containing almost no volatile components are laminated and heated under no pressure or virtually no pressure, and some of these methods have been put into practical use. . In this method, it is difficult to remove air bubbles caught between the base materials, and the resin used is limited to special resins.

Pressure molding is essential in order to remove any air bubbles present. Therefore, a continuous pressure heating device using a steel belt has recently been put into practical use, and a long prepreg,
A continuous layer-curing method has been developed using a base material impregnated with a resin that does not contain volatile components. According to this method, it was possible to remove air bubbles, and a satisfactory product was obtained. However, although the yield loss in the longitudinal direction of the substrate is eliminated, the yield loss in the side direction of the substrate still remains.

Therefore, we came up with a method of interposing gaskets on both sides of the base material. This method is disclosed, for example, in Japanese Patent Publication No. 4 Fu 33497.

[Problem to be solved by the invention]

Even with this method, thinning of both sides could not be avoided. The reason for this is that the melted and fluidized resin flows toward the sun entry side of the base material through the minute gap between the gasket and the end of the base material.

Note that since the resin is cured by heating, the resin does not flow to the outlet side of the base material.

[Means to solve the problem]

In order to suppress the resin from flowing out through the minute gap between the end of the base material and the gasket, the end of the base material and the gasket may be brought into close contact with each other. Therefore, in the present invention, pressing force is applied to the gasket from the side. The pressure needs to be sufficient to counteract the pressure applied to the molten resin via the belt surface.

FIG. 1 is a schematic perspective view of a main part of a manufacturing apparatus 1 according to the present invention, and FIG. 2 is a cutaway end view of the main part.

The base material 4 (or prepreg) impregnated with resin is fed between a pair of endless belts 3, 3. The endless belt 3.3 is heated and pressurized by the heating and pressurizing device 2.

Gaskets 5.5 made of an elastic material are provided on both sides of the base material 4.
is arranged.

This gasket 5.5 has a diameter approximately equal to the laminated thickness of the base material and is fed at the same speed as the endless belt 3.3. This gasket 5.5 is connected to a hydraulic system via a rigid band 6.6 which is also fed at the same speed as the endless belt 3.3! ! A pressure of 7'fp is applied. A roller is attached to the tip of the hydraulic device 7 and is in contact with a rigid strip 6.6. A plurality of hydraulic systems a are appropriately arranged so as to be able to resist the pressurizing force. The range of pressure to be applied may be from just before the pressure molding area to the resin melting area, and is not necessary in areas where the resin has hardened.

It is preferable to use the hydraulic device 117 to pressurize the rigid band in order to cope with the meandering of the base material, but if the meandering of the base material can be corrected by other means, other appropriate means such as the rigid band 6 can be used. A method of regulating the interval of .6 may also be used.

The rigid band 6.6 is preferably made of metal, has a rectangular cross-section, and is made of a long coiled material or endless in order to provide horizontal bending rigidity.

Next, as the number of base materials increases, the ends become uneven, causing the problem that the gasket is obstructed by the protruding base material and does not come into contact with the entire base material, leaving a small gap. Therefore, in order to weaken the stiffness of the end of the base material, a cut 8 was made at the end of the base material.
will be established.

[Effect]

Since the gasket is pressed into close contact with both sides of the base material and pressure molded continuously, no minute gap is created between the base material and the gasket, and resin outflow can be prevented.

〔Example〕

Example 1 A glass substrate impregnated with an epoxy resin and semi-cured to a thickness of 0.
Using 8 prepregs of 25 + m, molding pressure 2 x 1
Molding was carried out at 0 Pa and a temperature of 170°C. As a result, when pressure was applied from the side, the average thickness from the end to 100 mm was 1.58 mm, which is the average thickness of the sheet metal body 1.6flI11, whereas when pressure was not applied from the side, it was 1.30 mm.

Example 2 A paper base material impregnated with a phenolic resin having a melt viscosity of Q-95Pm,s during molding was used, and the end of the base material was 3 c
Make 2 arm incisions at ta intervals and apply a molding pressure of 2
Molding was carried out at a pressure of 10 Pa and a temperature of 170°C. As a result, when pressure is applied from the side, the average thickness from the end to 100 m + is 1.571 of the temporary overall average thickness of 1.61IIffi.
IIIlzIf no pressure is applied from the side, 1°10
11. [Effects of the Invention] According to the present invention, in continuous molding of a laminate using an endless belt, it was possible to mold with a uniform thickness down to the edges, and the yield of the product was extremely good.

[Brief explanation of the drawing]

FIG. 1 is a schematic perspective view of a main part of manufacturing equipment R1 according to the present invention, and FIG. 2 is a cross-sectional view of the main part. Explanation of symbols 2: Heating and pressing device 3: Endless belt 4: Base material 5: Gasket 6: Rigid band
Ani hydraulic device 8: cut □-1++1

Claims (1)

[Claims] 1. The opposing belt surfaces of two endless belts positioned so that the opposing belt surfaces run in the same direction at the same speed, and the belt surfaces sandwiched by the belt surfaces at both sides of the belt. A method for manufacturing a laminate, characterized by feeding a long sheet-like base material impregnated with resin into a space surrounded by a continuous gasket running in a continuous state, and pressurizing the base material via the belt and gasket. . 2. The method for manufacturing a laminate according to claim 1, wherein the long sheet-like base material has notches at both side ends. 3. Two endless belts positioned so that opposing belt surfaces run in the same direction at the same speed, a continuous gasket running between the belt surfaces on both sides of the belt, and the outside of the gasket. A laminate manufacturing apparatus comprising: a rigid band disposed on the belt; a pressure heating device that applies pressure to the belt; and a pressure device that applies pressure to the rigid band.