JPH01123734A - Manufacture of laminated sheet - Google Patents

Abstract

PURPOSE:To obtain the laminated sheet including no air bubbles even when curing time is reduced by a method in which the required number of the resin- impregnated bases impregnated with the resin deaerated under reduced pressure by a linear flow down type film-deaerating device are lapped on long glass fabrics, and the laminate in which long bandlike boils are arranged on said upper and/or lower surfaces, is cured continuously under a prescribed pressure. CONSTITUTION:Seven resin-impregnated bases 3 impregnated with the unsaturated polyester resin 2 containing benzoyl peroxide deaerated under reduced pressure by a linear flow down type film-deaerating device, are lapped on the upper surfaces of long glass fabrics 1. The long laminate 5 in which long copper foils 4 are arranged oppositely to the bases 3 impregnated with resin on said upper and lower surfaces, is continuously laminated, while excessive impregnating resin is squeezed by squeezing rolls 6. The long laminate 5 is passed through a curing furnace 7 by pulling out rolls 8, and is heated under atmospheric pressure or the pressure of 40kg/cm<2> or less, and then is cured continuously. The cured long laminate 5 is cut into a desired dimension by a cutter 9.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to a method for manufacturing a laminate used for electronic equipment, electrical equipment, computers, communication equipment, etc.

[Background technology]

Conventionally, laminates used in electrical equipment, etc. are made of a resin-impregnated base material and metal foil, and are pressed for a long time (1
(~2 hours) Because it is obtained by heat-pressing molding, even if the air bubbles contained in the resin remain as residual bubbles in the resin-impregnated base material, they can be removed from the laminate by long-term heat-pressing molding. As a result, no air bubbles remained in the cured laminate, resulting in a dense laminate. However, if a laminate is to be manufactured continuously, it is actually impossible to spend a long time in the curing process because the equipment becomes long.

For this reason, it is necessary to use a resin that has an extremely short curing time, or to cure it to a degree that allows it to be cut, then cut it to the required size, and then further air the laminate to ensure complete curing. is being carried out. However, no matter which method is used, it is impossible to discharge the residual air bubbles contained in the resin in the resin-impregnated base material to the outside of the laminate.

Air bubbles in the laminate extremely reduce moisture resistance, and the water, plating solution, and cleaning solution used when processing the laminate into printed wiring boards have a significant negative impact, and furthermore, when incorporated into electrical equipment,
This is a big problem since it reduces reliability during use.

[Purpose of the invention]

An object of the present invention is to provide a method for manufacturing a laminate that does not contain air bubbles.

[Disclosure of the invention]

The present invention involves stacking a required number of resin-impregnated base materials, each of which is made by impregnating a long strip base material with a resin that has been degassed under reduced pressure using a linear falling type thin film defoaming device, and further applying a long strip metal foil to the upper and/or lower surfaces of the resin-impregnated base materials. Since the laminate manufacturing method is characterized by continuously curing the long laminate while moving it and then cutting it into the required size, there are no air bubbles in the resin, so resin impregnation is difficult. Since there are no air bubbles in the base material, we were able to obtain a laminate with no air bubbles even though the curing time was shorter than that of the conventional multi-stage press manufacturing method.
The present invention will be explained in detail below.

The long strip-shaped base material used in the present invention includes glass cloth, glass paper, paper in addition to glass base materials such as glass nonwoven fabric,
Synthetic fiber cloth, synthetic fiber non-woven fabric, asbestos paper, cotton cloth, etc. are used, but it is preferable to use glass cloth, glass paper, non-woven fabric, etc., which have a large thickness adjustment effect.As the resin, unsaturated polyester resin is used. , diallyl phthalate resin, vinyl ester resin,
Epoxy V acrylate resin, epoxy resin, phenol resin, mehumine resin, etc. alone, mixtures, modified products, etc. are used. Also, the resin may be impregnated with only the same resin, but the first impregnation can be done with a low viscosity resin, and the secondary impregnation can be done with a high viscosity resin. A plurality of layers may be used to achieve more uniform impregnation. Of course, a curing agent, a crosslinking agent, a polymerization initiator, a polymeric diluent, etc. can be added to the resin, and if necessary, additives such as an inorganic powder filler or a short fiber filler can also be added. The above-mentioned resin is not used as it is, but must be degassed under reduced pressure using a linear falling type thin film defoaming device before use. As the linear material used in the linear falling type thin film defoaming device, def sticks, metal, fiber wire, wire, rope, thread, etc. are used, but it is preferable to use stainless steel wire from the viewpoint of strength.
However, the length of the wire, the diameter of the wire, the number of wires, etc. are not particularly limited. Single or composite foils of copper, aluminum, iron, stainless steel, nickel, zinc, brass, etc. are used as metal foils, and if necessary, an adhesive layer is provided on one side of the metal foil to improve adhesion. You can also do it. Curing time and curing temperature vary depending on the type of resin and can be selected depending on the resin used. The pressure applied during curing is preferably from no pressure to 4 o kg/cd, and can be selected depending on the resin used.

An embodiment of the present invention will be described below based on the illustrated embodiment.

Embodiment FIG. 1 is a simplified process diagram showing an example of the method for producing a laminate according to the present invention, and FIG. 2 is a simplified cross-sectional view showing an example of the linear flow type thin film defoaming device used in the present invention. be.

As shown in Fig. 1, benzoyl peroxide-containing unsaturated polyester resin 2, which has been defoamed under reduced pressure using a Doff 5 type thin film degassing device, is poured from the top surface of a long glass cloth l with a width of 1 m and a thickness of 0.2 ff. Seven sheets of spread-impregnated resin-impregnated base material 3 are stacked one on top of the other, and a width of 1 m is formed on the upper and lower surfaces.

Excess impregnated resin is squeezed out using a squeeze throw A/6 on a long laminate 5, which is a long adhesive-coated steel foil 4 having a thickness of 0.035ag, which is arranged with the adhesive side facing the resin-impregnated base material 3. They are continuously stacked on top of each other and sent to the curing furnace 7. At the exit of the curing furnace 7, there is a pair of upper and lower drawer rows/I/8 for transferring the elongated laminate 5.
is provided. With this pull-out roll 8, the long laminate 5 is
is transferred to pass through the curing furnace 7, and during the passage, it is heated in the curing furnace 7 under no pressure to be continuously cured. After pulling out the cured long laminate from the curing furnace 7 with drawer low fi/8,
Cut every 1m with cutter 9 to a thickness of 1.61), 1mX
A 1 m double-sided steel-clad unsaturated polyester resin laminate with a Fuss fabric base was obtained. The vacuum defoamed resin used in the present invention was obtained in the following manner using a linear falling type thin film defoaming apparatus. As shown in Figure 2, a large number of stainless steel wires IO are stretched vertically inside, the top and bottom are fixed, and benzoyl peroxide is applied to the resin supply bulb of the linear falling type thin film defoaming device housed in a cylindrical container 1). When the containing unsaturated polyester resin is supplied, the resin is formed into a thin film along the surface of the wire 1G and is gradually sent to the resin discharge port U at the bottom. The inside of the container U is under reduced pressure, and the reed resin is degassed under reduced pressure.

Comparative Example A laminate was obtained in the same manner as in the example except that the resin of the example was used without degassing under reduced pressure.

〔Effect of the invention〕

As is clear from Table 1, the bubble-incorporated state of the laminates of Examples and Comparative Examples shows that the performance of the laminates obtained by the method of the present invention was good, confirming the superiority of the method of manufacturing laminates of the present invention. did.

Table 1

[Brief explanation of the drawing]

FIG. 1 is a simplified process diagram showing an embodiment of the method for producing a laminate according to the present invention, and FIG. 2 is a simplified cross-sectional view showing an embodiment of the linear falling thin film defoaming device used in the present invention. 1 is a long base material, 2 is a resin, 3 is a resin-impregnated base material, 4 is a metal foil, 5 is a long laminate, 6 is a squeeze roll, 7 is a curing furnace, 8 is a drawer row ~, 9 is a cutter, lO is wire, 1)
is a cylindrical container, holder is a resin supply port, and a mouth line is a resin discharge port.

Claims (2)

[Claims] (1) Layer the required number of resin-impregnated base materials in which a long strip-shaped base material is impregnated with resin that has been degassed under reduced pressure using a linear falling thin film defoaming device, and then apply a long metal foil to the upper and/or lower surfaces of the resin-impregnated base materials. A method for manufacturing a laminate, which comprises curing the long laminate continuously while moving the long laminate, and then cutting the laminate into required dimensions. (2) Pressure applied during curing ranges from no pressure to 40 kg/cm^
2. The method for manufacturing a laminate according to claim 1, wherein: