JPS58183253A - Manufacture of laminated board - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] The present invention relates to a method for producing a marked laminate.

Laminated boards used in electrical and electronic equipment are now commercially available with markings unique to the manufacturer on one or both sides to indicate manufacturer identification, quality assurance, grade classification, etc. It has become.

Conventionally, the manufacturing method for mark-printed laminates involves adding a prepreg (hereinafter referred to as mark-printed prepreg) obtained by impregnating and drying a thermosetting resin face to base paper with marks printed on one side of the prepreg without marks printed on it. Alternatively, a method is known in which the layers are placed on both surfaces and laminated under heat and pressure.

In general, mark printing prepreg is
There is a tendency for distortion to remain in the base paper, making the printed surface concave and easily curling (this tendency is particularly strong in prepregs used for laminates that require electrical properties, as they are pre-impregnated with water-soluble phenolic resin). When configured as shown in FIG. 1, there was a problem in that it was difficult to place only the mark-printed prepreg l uniformly and flatly. That is, when the prepreg structure 3 is moved or inserted between mirror plates, there is a problem in that the mark-printed prepreg 1 is misaligned. 2 is a prepreg without mark printing.

For this reason, there were troublesome problems that required extremely careful handling or misalignment prevention jigs, and problems that required man-hours because it was impossible to automate processes such as the transportation of prepreg components and the mounting of mirrored plates. . In addition, a method for implementing curl prevention treatment for mark-printed prepreg in the prepreg manufacturing process,
In the case of IHI, studies have been made such as attaching a warp prevention bar or changing the type of impregnated resin, but these have the problem of degrading the properties of the laminate and are not practical.

Furthermore, since the mark-printed prepreg is on the surface of the laminate, there is a risk that the printed mark will be transferred to the mirror plate.

The present invention has been made to improve these drawbacks, and provides a method for manufacturing a laminate that has good workability and does not cause misalignment of the mark-printed prepreg.

As shown in FIG. 2, in the present invention, a structure 3' in which one or more prepregs 2 without mark printing are placed on both sides of a mark printing prep 11 and a prepreg 1 is sandwiched between mirror plates and heated under pressure. It is characterized by being molded. In the present invention, the mark-printed prepreg l is stretched by the weight of the prepreg 2 that has not been printed with marks, and the curled ends are stretched and made into a uniform surface, making it easy to insert automatically. Prepreg is made by printing a predetermined mark using, for example, Evokin resin ink using 5 to 12 mils kraft paper or linter paper, which is generally used as a base paper for laminates, and then pre-impregnating the mark printing base paper with water-soluble phenolic resin varnish and drying it. It is manufactured by impregnating and drying a thermosetting resin such as phenol or modified phenol resin. Prepreg without mark printing is obtained by impregnating base paper with a thermosetting resin and drying it in the same manner as in the case of mark printing prepreg. In the laminated structure of the prepreg, there is no difference in function and effect whether the printed surface of the mark-printed prepreg is on the surface layer side or the inner layer side.

Example 10 Mils mark printing kraft base paper was pre-impregnated with a water-soluble phenolic resin varnish and dried, and then impregnated with a tung oil modified phenolic resin and dried to produce a mark printing prepreg. At this time, the curl of the ear part of the prepreg is 5 to 10.1111
observed. Separately, an unmarked prepreg was produced by impregnating and drying a tung oil-modified phenolic resin on +01 Luss kraft paper without markings printed in the same manner as described above.

A structure in which one sheet of mark-printed prepreg was stacked with one sheet of the 2-ribbon prepreg on one side and three sheets of unmarked prepreg was piled up on the other side was transported by an automatic transport line ζ trowel, but it was not placed in the same position as in the conventional method. No misalignment occurred, and the automatic supply of mirrored plates could be applied smoothly. The structure inserted between the two mirror plates in this way was heated at a temperature of 160°C ([gradient +00°C).
1. After molding for 50 minutes at kp/cl and cooling. A laminate with a thickness of Om was obtained. The mark clarity of the laminated board is almost comparable to that of the conventional method, and the surface insulation resistance of the laminated board is also excellent. It was.

As described above, according to the present invention, (1) The transportation of the prepreg structure to the mirror plate and the placement on the mirror plate can be automated, resulting in a significant reduction in man-hours.

(21 mark printing is not transferred to the mirror plate (and the mark clarity is maintained sufficiently).

(31) When manufacturing copper-clad laminates and placing copper foil on them, the copper foil does not shift or wrinkle.

(4) The electrical properties of the laminate are superior to those obtained by molding conventional structures.

The present invention has the above-mentioned effects, and is particularly effective in automating the manufacturing process of double-sided marked laminates and single-sided marked copper-clad laminates.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of a prepreg structure based on a conventional method;
FIG. 2 is a sectional view showing one embodiment of a prepreg structure according to the present invention. 1 is prepreg with mark printing, 2 is prepreg without mark printing, 3' is prepreg structure patent applicant Shin-Kobe Denki Co., Ltd.

Claims (1)

[Claims] A method for manufacturing a laminate, characterized in that a plurality of sheets of prepreg are stacked and formed under heat and pressure, and a prepreg with a mark printed thereon is positioned as an inner layer.