JP3014480B2 - Manufacturing method of laminated board - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

When a plurality of laminated plates are simultaneously formed between a pair of hot plates, the characteristics of the laminated plates, such as warpage and dimensions, are different between those closest to the hot plate and those other than the hot plate. The present invention relates to a method for producing a laminated board suitable for a high-density printed wiring board having good workability and workability when processing into a printed wiring board or the like by reducing the above difference in characteristics.

[0002]

2. Description of the Related Art When a plurality of laminated plates are formed between a pair of hot plates, the laminated plate formed closest to the hot plate is more likely to be warped or change in size than other laminated plates.

The cause of this depends on the difference in heat transfer from the hot plate, but as a result of the study by the present inventors, the main difference is the movement of the metal mirror plate (hereinafter referred to as mirror plate) in contact with the laminated material during molding. It turned out to be the cause. That is, the mirror plate receives stress due to the flow of the resin in the prepreg due to the molding pressure as well as the thermal expansion due to the heating, and elongates, albeit slightly, in the plane direction. However, in the mirror plate closest to the hot plate, the surface on the hot plate side is in contact with the cushion member between the hot plate and the hot plate, so that the above-mentioned stress is not received. For this reason,
This mirror plate has a relatively small extension, unlike other mirror plates.

[0004] Therefore, the laminated plate in contact with the mirror plate closest to the hot platen has a large stress strain remaining after molding due to the difference in elongation between the two mirror plates because the other surface is in contact with the other mirror plate. This causes warpage and dimensional change to increase.

[0005]

According to the present invention, one or more prepregs are stacked and sandwiched between metal mirror plates.
In the method of manufacturing a laminated plate in which a plurality of sets of the prepregs are simultaneously heated and pressed between hot plates, in order to make the elongation of the metal mirror plate closest to the hot plate equal to other mirror plates, the hot plate and Put cushion material between the mirror plates,
A prepreg, which is the same as or different from the prepreg, is formed between the metal member and the metal mirror plate .

[0006]

According to the present invention, there is provided a method of manufacturing a laminated board in which one or more prepregs are stacked and sandwiched between mirror plates, and a plurality of sets of the prepregs are simultaneously heated and pressed between hot plates. In order to make the elongation of the mirror plate closest to the hot plate equal to that of the other mirror plates, a prepreg identical or different from the prepreg is inserted between the hot plate and this mirror plate and molded. This is a method for producing a laminate.

[0007] With this configuration, the mirror plate closest to the hot plate has the same elongation as other mirror plates due to the behavior of the prepreg inserted between the hot plate and the hot plate. All the laminated plates receive the same action from the mirror plates on both sides, so that the warpage and the dimensional change are small and the variation is small.

[0008] A cushion material is disposed between the hot platen and the mirror plate as usual . The prepreg to be inserted is either the hot platen side or the mirror plate side (or both) of this cushion material, but in the present invention, the extension of the mirror plate is
Then, it is inserted into the mirror plate side.

[0009]

EXAMPLES Examples and comparative examples (conventional examples) are shown below. In these examples, a laminate formed between a pair of hot plates is a double-sided copper-clad epoxy resin glass cloth laminate (1.
6 mm thick). The thickness of the mirror plate is 2 mm, and the molding conditions are 170 ° C., 50 kg / cm ² , and 120 minutes. The cushion material is made by bonding five pieces of kraft paper and bonding aluminum foil to both surfaces thereof, and has a thickness of about 1 mm.

In Example 1, a prepreg (18) made of the same epoxy resin impregnated glass cloth as used for the laminate was used.
0μm thick) two inserted into the cushion material and specular plates were
A case, Comparative Example 1 is a case where two said prepreg is inserted between the hot plates and the cushion member, the case of Comparative Example 2 is molded without inserting the conventional prepreg.

The warp and dimensional reduction ratio of the laminates obtained in these examples were measured for the outermost laminate (A) and the middle laminate (B). Table 1 shows the results.

[0012]

[Table 1]

(Measurement method) Warp: A laminate of 500 × 500 mm was placed on a plane, and the maximum height was determined (unit: mm). 2. Dimensional change rate: The laminate was cut into a size of 300 × 300 mm, and after etching, heat-treated at 170 ° C. for 30 minutes. From the difference between the dimension (L ₁ ) before etching and the dimension (L ₂ ) after heat treatment, it was determined by the following equation. {(L ₁ −L ₂ ) / L ₁ } × 100 = Dimensional change rate (%)

[0014]

As is clear from the above examples, the laminate obtained by the method of the present invention has a small warpage and small dimensional change, and its variation is smaller than that of the conventional one. In addition, since other various specifications are equal to or higher than those of the related art, they are suitable for high-density printed wiring boards.

Claims (1)

(57) [Claims] 1. One or more prepregs obtained by impregnating a resin varnish are stacked and sandwiched between metal mirror plates,
In the method for manufacturing a laminated board in which a plurality of sets of prepregs are simultaneously heated and pressed, a cushion material is sandwiched between a hot plate and a metal mirror plate closest to the hot plate, and the cushion material and the metal
A method for manufacturing a laminated plate , wherein a prepreg identical to or different from the prepreg is inserted between the mirror surface plates and molded.