JPH02293111A - Manufacture and manufacturing device for laminated sheet - Google Patents

Abstract

PURPOSE:To form a laminated sheet where a foam is not generated and insulation resistance and heat resistance of a board are favorable, by a method wherein a spacer is put around a structure comprised of a prepreg and the same is heated and pressurized by piling cushioning materials upon the top and bottom of the same. CONSTITUTION:A treated matter obtained by sticking resin such as methylol melamine to a board such as craft paper is impregnated with thermosetting resin for low-pressure molding, a mold release film is put over a laminated sheet, a structure is put between a top and bottom panel boards 3 between heating and pressurizing presses and a spacer 2 is put around its structure 1. A cushioning material 4 is piled upon the top and bottom or either side of the spacer 2 and the same is heated and pressurized further by making a thickness of the same into a finished one. Since the cushioning material is piled upon the spacer for heating and pressurization, a bubble is not generated and mold finish up to an end part of the sheet is favorable.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a method and apparatus for manufacturing a laminate with good thickness accuracy and good appearance.

[Conventional technology]

In the production of laminates for use with thermosetting resin moldings for low-pressure molding, the molded products contain a large number of air bubbles, which adversely affect mechanical strength and electrical performance. In order to prevent the generation of bubbles, the method described in Japanese Patent Publication No. 53-45827 involves placing a spacer around the resin-impregnated base material structure sandwiched between mirror plates, and heating the resin for a sufficient period of time at a temperature that does not harden the resin. After pressurizing and removing the air contained therein, the temperature is raised to the curing temperature of the resin, and molding is performed as Jf1.

When this manufacturing method is carried out with the spacer having the finished plate thickness, the air contained in the resin-impregnated base structure is trapped in the space between the structure and the spacer together with the resin, and is then thermally cured and molded. nru.

[The problem that the invention attempts to solve]

Using the method shown in Japanese Patent Publication No. 55-45827, it is possible to remove bubbles to some extent by preheating and pressurizing at a temperature at which the resin does not harden, but it is not possible to obtain good moldability all the way to the edges. However, if the viscosity of the resin is low, the resin may flow out from between the end plate and the spacer. Furthermore, in order to remove the air contained in the prepreg, the preheating and pressurization time must be increased. Moreover, when the resin content is high, the laminate does not have a good appearance.

In recent years, in order to improve productivity, a long fiber base material is impregnated with a liquid resin and then continuously processed using a double endless belt press. There is a method for manufacturing shaped laminates. However, this method has poor plate thickness accuracy at the end face.

In view of the above-mentioned problems, the present invention aims to improve appearance and board integrity in the production of laminates using a thermosetting resin for low-pressure molding and using a press method using a spacer or a tuffle endless belt press method. The purpose of the present invention is to provide a manufacturing method and manufacturing device for obtaining an excellent laminate.

[Means to solve the problem]

The present invention uses a base material impregnated with a thermosetting resin for low-pressure molding using a conventional dipping method or coating method, or a base material made by laminating an appropriate number of B-legs that have been dried after soaking and made the resin B-stage. , sandwiched between the upper and lower sewing plates between the heating and pressing presses,
In this method, a spacer is placed around the ellipse, and a cushion is placed on either the top or bottom of the spacer, and the thickness thereof is used as the finished height of the laminate under heat and pressure.

The spacer is a metal plate made of stainless steel, aluminum, steel, or the like. Cushion rubber, paper, organic fibers, inorganic fibers, textiles, plastics, etc. are good, but other materials that absorb pressure and have good sealing properties are used for customs clearance.

The material is cut to the same size as the spacer, and is laminated in the form of a thin plate on either or both of the top and bottom of the spacer. The thickness of the Geun-yong phase is determined so that the thickness of the pre-pressurized spacer and the thickness of the spacer will be the finished thickness of the plate.

The low-pressure molded thermosetting resin used in the present invention 1c is ebony/
f! 14 resins, unsaturated polyester resins, diallyl phthalate resins, unsaturated acrylic resins, vinyl ester resins, etc.

The substrate used is a woven fabric, non-woven fabric, or mat made of inorganic fibers such as glass and asbestos, or organic fibers such as polyester and polyamide. Also, link paper,
It is possible to use kraft paper, a mixed paper thereof, a mixed paper of paper and inorganic FA fiber, and a combination of these base materials.

Furthermore, in the production of a laminate in which several long resin-impregnated base materials are continuously sent and stacked, and then continuously heated and pressed using a double endless belt press type heating presser, This is a manufacturing method in which a long metal spacer is formed by heating and pressurizing the resin-impregnated base material with full-feeding cushions stacked either above or below the sides of the resin-impregnated base material.

[Effect]

The function of the spacer is said to improve the thickness accuracy of the laminate and prevent resin from flowing out.

However, in the conventional method, the head plate and the spacing length are not densely layered over the entire surface of the work, which causes pressure unevenness and part of the resin to flow out during heating and pressing, resulting in a poor finished appearance of the laminate.

When the spacer of the present invention is used in combination with the bushing, there is no uneven pressure, unnecessary flow of the resin, and excellent moldability.

If the present invention is applied to a double endless belt press for continuous molding, the same effect will be obtained.

〔Example〕

1. A device according to an embodiment of the invention is illustrated in the drawings.

Figure 1 shows that in order to heat and pressure mold a laminate, sharp plates 3, resin-impregnated base material 1, and upper and lower hot plates of the entire press are stacked alternately, and cushioning material is placed above and below the periphery of the laminate 1. FIG. 2 is a plan view of FIG. 1 with the upper mirror plate removed.

Next, an embodiment of the laminate manufacturing method of the present invention using the above-mentioned apparatus will be described.

Thickness α25+11IO, weight 140 g/rrf
OJ Krato paper is coated with meterol melamine resin (Nikkei Kasei M
A treated paper with an adhesion resin content of 14% was obtained by pre-treatment with L-630). To this, BP is
A festival to which 2 parts by weight of O paste (50% benzoyl peroxide) was added was impregnated to give a buffing fat content of 70%. Lay down 6 sheets of the obtained resin-impregnated paper and cover with 111 type film.
Set it up as shown in Figure 2.

The spacer at this time has a thickness of t 40 ffifl and a width of 20
Using IIul aluminum (SUS-504), kraft paper (135g/rr J4 x 0.25fflIn) of the same size was layered on both the top and bottom sides to a thickness of 211mm.
Sandwiched from above and below with 1111 board, 120℃, 20kg/
- A dermal board was obtained by curing under pressure for 25 minutes.

2. A laminate was obtained using glass cloth (Nittobo) and glass nonwoven fabric (Nippon Vilin) as the base material, and the resin content was 85% (same conditions as in Example 1).

S The equipment of this example t1t. will be explained using diagrams.

i 4 Figure 41 is a perspective view illustrating the feeding S of the resin-impregnated long base material 7 of the double endless belt press. A long metal spacer 8 in which cushioning materials 9 are stacked vertically with a gap between the upper and lower belts 6 is sent to both sides of the base material 7.
and the spacer 8 moves at the same speed as the pelt 6. FIG. 3 is a side view of the base material inlet of this apparatus, and FIG. 5 is a front view of the base material inlet. This apparatus has a 2lII heat pressurizer in the center of the process, through which the base material and the spacer are heated and pressurized, but the heating pressurizer is not shown.

Six sheets of impregnated paper obtained in the same manner as in Example 1, an electrolytic copper foil with a thickness of 35 μm coated with an epoxy resin adhesive, and a release film were set. In addition, the belt has a thickness of 1.5 mm at both ends.
0IILIIl width 20ffillo long aluminum spacer, one side of it κ kraft paper (thickness α25a+r+
, Weighing 135g/rr? ) k stacked. Under this condition, the third
Molding was carried out at 130° C. and 15 kg/alt pressure using the apparatus shown in Figures 4 and 5 (however, the cushioning material was only on one side, unlike the figure).

The steel-clad laminate obtained by this method had a better molding finish up to the edge of the sheet than that molded without using a bush blower.

[Example 2] 1. A laminate was obtained under the same conditions as Example 1, except that the space thickness was 1.58 mm and no bushing material was used. 2. Thickness of surface f k 1. A laminate was obtained under the same conditions as in Example 2 except that 58aa+ was used and the mushroom material was not used.

Table 1 shows the characteristics and appearance of the horizontal 1-plates obtained in Examples 1 and 2 and Comparative Examples 1 and 2.

Table 1 Insulation resistance......Substrate heat resistance according to JIS C6481...50X5 (Iffia+ test piece'f: Placed in 260℃ solder, time until blistering occurs) Appearance/ ...... Visual observation [Effects of the invention] According to the method for manufacturing a laminate of the present invention using the apparatus shown in Figures 1 and 2 K, the results are as follows: As is clear from the comparison, it was confirmed that by overlapping the spacer with the cushion material, bubbles were not generated and the IE edge resistance and substrate heat resistance were improved.

Also, when continuous molding is performed using a double endless belt press, the same excellent molding as in Examples 1 and 2 can be achieved by using the spacers and bushings shown in No. 3, 4, and 5. Obtainable.

[Brief explanation of the drawing]

FIG. 1 is a side view of an embodiment of the present invention, FIG. 2 is a plan view of FIG. 1, and FIGS. 3, 4, and 5 are diagrams of continuous molding components of the present invention. 1... Resin-impregnated base material constituent, 2... Spacer, 6... Iita, 4...
・Cushion removal, 5...Resin accumulation, 6.
... Endless belt, 7 ... Resin-impregnated long base material, 8 ... Spacer, 9 ... Cushion material. Figure 2

Claims (1)

[Claims] 1. In a method for manufacturing a laminate in which a spacer is placed around a structure in which an appropriate number of base materials impregnated with a thermosetting resin for low-pressure molding are stacked and heated and pressed, A method for manufacturing a laminate, which comprises stacking a cushioning material on one entire surface, making the thickness the final thickness of the laminate, providing a resin reservoir space between the component and the spacer, and heating and pressurizing the material. 2. Between the upper and lower hot plates of the press for heating and pressurization, there is a mirror plate that is to sandwich a structure made of overlapping resin-impregnated base materials, and a cushioning material that can surround the structure and that can cover the entire surface of the top and bottom or either side. A laminate manufacturing device that is equipped with a spacer and heats and presses. 3. In the continuous manufacturing method of laminates, in which a suitable number of long base materials impregnated with thermosetting resin for low-pressure molding are stacked and sent to a double endless belt press and then molded by a heating pressurizer in the center, the gap between the upper and lower belts is A long spacer is sent to both sides of the base material with a space between them, and a cushioning material is layered on the top and bottom of the spacer, or on the entire surface of either side, and the thickness is heated and pressurized to make the finished thickness of the laminate. A method for manufacturing a laminate. 4. A long resin-impregnated base material is continuously heated and pressure-molded with a long spacer on both sides between the upper and lower belts of a long resin-impregnated base material with cushioning material layered on either side. 4. The apparatus for use in the method for producing a laminate according to claim 3, wherein the apparatus is fed together with the impregnated base material and is continuously formed using a heating and pressurizing device provided at the center of the press.