JPH03246015A - Manufacture of laminated sheet - Google Patents

Abstract

PURPOSE:To manufacture a laminated sheet free from positional deviation, by a method wherein a laminated matter is fixed by a cam arranged on a carrier plate and molded. CONSTITUTION:A base is impregnated with resin, upon which at least one sheet of prepreg 5 to be obtained by drying the same is superposed. A plurality of sets of matters obtained by superposing a metallic foil 6 upon its outside are laminated and mounted to a carrier by truing up end faces. Then an end face of a laminated matter 1 is fixed by its circular-arclike part by turning a cam 3 possessing a fan-shaped plane and a pillarlike form as a positional deviation preventive jig arranged two by two on sides each of a fringe part of the carrier plate 2 around its shaft 4 as a fulcrum. Then the carrier plate 2 is inserted between hot plates of a press, heated, pressurized, molded and a plurality of laminated sheets are manufactured at the same time. With this construction, a laminated sheet, which is free from a positional deviation and has a homogenous thickness up to an end part, is obtained. In addition, the cam 3 as the positional deviation preventive jig can be removed easily from the laminated sheet after molding.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a method for manufacturing a laminate used for printed wiring boards and the like.

[Conventional technology]

The method for manufacturing laminates involves impregnating a base material with resin and drying it to obtain one or more sheets of prepreg, and then applying a release film or, if necessary, copper foil, etc., at appropriate intervals depending on the thickness of the finished laminate. There is a known method for simultaneously manufacturing multiple laminates by inserting metal foil into a laminate, mounting it on a carrier plate, inserting the laminate between the hot discs of a press, and forming the laminate under heat and pressure. ing.

However, the resin of the prepreg constituting the laminate mounted on the carrier plate remelts and flows during the heating and pressure molding process. For this reason, as the resin flows, the laminated prepreg, mold release film, or metal foil moves and misaligns, resulting in thinner edges of the laminate after molding and unevenness on the laminate. There was a problem. As a countermeasure against this problem, a method described in Japanese Patent Application Laid-open No. 107312/1983 can be used. That is, in order to prevent displacement of the laminate during hot-press molding, the laminate 1 is fixed to the carrier plate 2 shown in FIG. 4 using a frame 7. Further, it is also common practice to cover the laminate 1 mounted on the carrier plate shown in FIG. 5 with a box 8 to fix the laminate 1.

However, with these methods, the resin flowing out of the prepreg adheres to the surrounding frames or boxes, making it difficult to remove these frames or boxes from the laminate. As a result of applying stress to the laminate, the laminate often warps after being removed.Also, these days, when laminates must be manufactured from prepregs of multiple sizes, A wide variety of misalignment prevention jigs, such as carrier plates, must be available to suit the size of the prepreg.

[Problem to be solved by the invention]

The present invention is capable of forming a laminate without misalignment when producing a laminate by heat-pressing molding the laminate laminated on a carrier plate. To provide a method for manufacturing a laminate, which can be removed from the laminate in a volume 5, can handle many types of prepreg sizes with a small number of misalignment prevention jigs, and enables rational production.

[Means for Solving the Problems] The present invention has been made in view of the above points, and uses a laminate obtained by laminating one or more prepregs obtained by impregnating a base material with a resin and drying it as a carrier. In the method of producing a laminate by mounting the carrier plate on a plate, inserting the carrier plate between the hot discs of a press, and molding under heat and pressure, the laminate is fixed with a cam disposed on the carrier plate and then molded. An object of the present invention is to provide a method for manufacturing a laminate, which is characterized by the following.

〔Example] The present invention will be explained below based on the drawings.

FIG. 1 is a plan view of an embodiment of the present invention, and is a plan view of a laminate mounted on a carrier plate taken out from a press after being hot-pressed.

FIG. 2 is a sectional view thereof.

A laminate according to the invention can be made as follows. One or more sheets of prepreg 5 obtained by impregnating a base material with resin and drying it are stacked, and metal foil 6 is stacked on the outer surface of the prepreg 5, forming a single laminate. Align and stack them on the carrier plate. Thereafter, by rotating the cams 3 having a fan-shaped plane and a columnar shape as a fulcrum, two cams 3 are disposed on each side of the peripheral edge of the carrier plate 2 to prevent misalignment. The end face of the laminate 1 is fixed at its arcuate portion. Thereafter, the carrier plate 2 is inserted between the hot discs of the press and subjected to heating and pressure molding, thereby manufacturing a plurality of laminates at the same time.

Instead of using the metal foil described above, a polyester film, a fluorine-containing resin film, or the like having mold releasability may be used between the prepregs.

The planar shape of the cam 3 disposed on the carrier plate 2 is as follows:
In addition to the sector shape of the embodiment shown in Fig. 1, heart shape, semicircle,
The shape is not particularly limited as long as the distance from the fulcrum to the point of action changes with movement, such as a crescent shape, and the overall shape has the above-mentioned planar shape and is columnar.

Carrier plate 2 of cam 3 as a jig to prevent positional deviation
The cams are arranged by the shaft 4, which serves as the fulcrum of the cam, and it is preferable that there be at least one, preferably two or more, and particularly preferably three or more positions on each side of the periphery of the carrier plate 2. It is better.

The cam 3 can be made of iron, copper, aluminum, or the like, an alloy mainly made of these materials, or a plastic that can withstand heat and pressure molding, such as polyimide or polyphenylene sulfide.

As the carrier plate, a plate-shaped body, a box-shaped body, etc. made of iron, copper, aluminum, etc., or an alloy mainly made of these materials can be used.

Further, the above-mentioned laminate can be made of the following materials.

As resins, thermosetting resins such as phenol resins, unsaturated polyester resins, epoxy resins, polyimide resins, and modified resins thereof are used, and in addition, thermosetting resins such as phenolic resins, unsaturated polyester resins, epoxy resins, polyimide resins, and modified resins of these resins are used. Accordingly, a resin composition containing a curing agent and a curing accelerator suitable for each resin, as well as a flame retardant, a diluting solvent, etc., is used.

Glass cloth or the like is usually used as the base material impregnated with these resin compositions. In addition, inorganic fiber cloth such as quartz fiber cloth, organic fiber paper such as cellulose fiber paper, highly heat-resistant organic fiber cloth such as polyimide resin fiber cloth, etc. can be used in combination depending on the purpose.

Next, the prepreg is made by impregnating the base material with the resin composition,
Obtain by drying. The conditions for obtaining this dried prepreg are as follows: 1. The drying temperature is preferably 120 to 160°C.
Drying at a temperature exceeding 60°C is undesirable because the resin hardens too much and makes repeated drying difficult.

Dry prepreg is in the range generally referred to as the B stage in the curing process of thermosetting resins, and when heat is applied, the resin remelts and the curing reaction progresses, so even if you touch it with your hands, it will not melt. It is non-sticky and has properties that allow it to be stacked on top of each other.

Furthermore, stack one or more of the above prepregs to a predetermined size, insert a release film or a metal foil such as copper foil at appropriate intervals to form a laminate, and attach it to the carrier plate. After stacking and mounting, the laminate is inserted between the hot discs of a press and molded under heat and pressure to obtain a laminate. The conditions for molding this laminate include a temperature of 140 to 180°C;
Molding time 70-120 at pressure 30-90kg/cj
Minutes are preferred.

As the metal foil disposed on the surface of the laminate as required, metal foils such as copper, aluminum, nickel, and stainless steel are preferred, with copper foil being particularly preferred since it has good electrical conductivity. In this case, either electrolytic copper foil or rolled copper foil may be used, and there are no particular limitations thereto, or the above-mentioned metal foil with a circuit formed thereon may be used.

Generally, the number of prepregs used in the laminate 1 is determined depending on the thickness of the finished laminate, and is generally 1 to 1.
5 sheets are used, and if necessary, the above-mentioned metal foil, usually 12-70 μm copper foil, is placed on both sides of the prepreg, and 1 to 20 sets, preferably 6 ~ Consists of 12 groups.

[Effect]

The part of the laminate 1 that is fixed by the cam 3 before being inserted into the hot platen is only the thickness of the laminate when it is heated and pressed, but the part of the laminate 1 that is not fixed to the cam is also When the carrier plate 2 is inserted between the hot discs of the press for lamination molding and pressurized, all the laminates 1 are fixed by the cam 3 at this stage, and due to the flow of the prepreg resin remelted by heating. The prepreg and metal foil do not move, so laminates can be formed without misalignment.
A laminate with a uniform thickness up to the edges can be obtained.

The cam 3 as a jig to prevent positional deviation is the carrier plate 2
Since they are scattered on each side of the periphery of the prepreg 5, even if there is resin flowing out from the prepreg 5, it can be easily removed from the laminate after molding, resulting in a laminate without warping. can get.

In addition, as shown in Fig. 3, the cam 3 has a shape in which the distance from the fulcrum of the shaft 4 to the point of action changes as it moves, so even if the prepreg becomes thicker from A size to B size,
This can be done simply by changing the fixing position of the cam from (a) to (b), and there is no need to prepare misalignment prevention jigs to match the size of the prepreg, allowing for rational production.

〔Effect of the invention〕

By fixing the laminate of prepregs laminated on the carrier plate of the present invention with a cam disposed on the carrier plate and molding, it is possible to prevent the laminate from shifting during heating and pressure molding. 1. The misalignment prevention jig can be easily removed from the laminate, and a small number of misalignment prevention jigs can be used to accommodate a wide variety of prepreg sizes, making it possible to manufacture rational laminates. .

[Brief explanation of drawings]

FIG. 1 is a plan view of an embodiment of the present invention, FIG. 2 is a sectional view thereof, FIG. 3 is a plan view showing an example of use of the present invention as an enlarged view of a portion of FIG. 1, and FIG. The figure shows a sectional view of one conventional example, and FIG. 5 shows a sectional view of another conventional example. (Margins below) 1... Laminate 2... Carrier play 3... Cam 4... Shaft 5... Prepreg 6... Metal foil 7... Frame 8... Box body

Claims (1)

[Claims] (1) A laminate consisting of one or more layers of prepreg obtained by impregnating a base material with resin and drying it is mounted on a carrier plate, and this carrier plate is inserted between the hot discs of a press and molded under heat and pressure. A method for manufacturing a laminate, characterized in that the laminate is fixed by a cam disposed on a carrier plate and then molded.