JPH0524165A - Manufacture of laminated sheet - Google Patents

Abstract

PURPOSE:To continuously manufacture a laminated sheet while suppressing the generation of appearance and shape inferiority by setting the thickness irregularity of a long metal foil to a specific numerical value range when long metal foils are arranged to the upper and rear surfaces of a long resin impregnated base material and the formed laminate is continuously molded under heating and pressure. CONSTITUTION:A predetermined number of long resin impregnated base materials 1 such as glass sheets impregnated with a predetermined resin are supplied and long metal foils 2 are arranged to the upper surface and/or rear surface thereof to form a laminate. At this time, as the long base materials 1, ones different in thickness or resin or composed of different base materials may be used and an adhesive 21 may be preliminarily applied to the laminating surfaces of the long base materials 1. Further, the arrangement and size of a press roller 5 or the roller 6 of a double belt molding machine 4 are appropriately set. A laminated sheet subjected to molding under heating and pressure is cooled in a cooling passage 7 and cut by a cutter 8 to complete a laminated sheet 9 having a predetermined size. In the above mentioned constitution, the thickness irregularity of the long metal foils 2 is set to + or -0.5% or less.

Description

Detailed Description of the Invention

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a laminated board. More specifically, the present invention relates to an improved continuous production method capable of producing a laminate for a printed wiring board, which is useful for electric / electronic equipment / communication equipment, computers, etc., while suppressing the occurrence of defects in the external shape. It is a thing.

2. Description of the Related Art Conventionally, electrical / electronic equipment / communication equipment /
Printed wiring boards having various configurations have been used for computers and the like. For these printed wiring boards,
In response to an increasing demand for high-density packaging in recent years, there has been a strong demand for improvement in heat resistance and dimensional accuracy of a laminate as a base material. In order to meet such a demand for technological improvement, improvements have been made in the constitution of the resin, additives, etc. of the laminated plate. On the other hand, as a method for producing a laminated plate with high efficiency, a molding method in which a long base material is impregnated with a resin and a long metal foil is continuously disposed and integrated into the resin is also improved. Efforts have been made to improve accuracy.

However, in spite of various innovations and improvements so far, in the case of this continuous laminate molding method, it is different from the pressure press method as a normal batch production method. In addition, there is a drawback that the thickness of the metal foil is easily affected by the thickness variation, and the occurrence of defective external shape such as waviness, wrinkles, and streaks cannot be avoided. The occurrence of such a defective external shape has been an obstacle to circuit formation when the laminated board is used as a printed wiring board. Therefore, with higher productivity, excellent thickness accuracy, etc.
Moreover, it has been desired to realize a continuous laminated plate manufacturing method capable of suppressing the appearance defects. This invention
The present invention has been made in order to solve the problems as described above, and an object thereof is to provide a continuous laminated plate manufacturing method in which the occurrence of defective external shape is suppressed.

SUMMARY OF THE INVENTION In order to solve the above problems, the present invention provides a laminated board in which long metal foils are provided on the upper surface and / or the lower surface of a required number of resin-impregnated long base materials. The present invention provides a method for producing a laminated plate, characterized in that, in the case of continuously heating and pressing, the metal foil is formed with a thickness variation of ± 0.5% or less. That is, according to the present invention, the appearance defect of the laminated plate occurs in wrinkles and stripes that occur when unwinding (winding) a long metal foil, and a heat curing step after laminating the metal foil and the base material. Although it is classified as wavy, in any case, these defects are caused by the variation in the thickness of the metal foil, and the variation in the thickness of the copper foil in the conventional method is ± 1 to 3%. It was completed based on the finding that appearance defects are inevitable. Therefore, the essential feature of the present invention is that the thickness variation of the metal foil is controlled within ± 0.5%, more preferably within ± 0.25%. As the metal foil in this case, a copper foil used for a normal laminated board for a printed wiring board, aluminum, stainless steel, or any other suitable metal (alloy) foil is targeted. Further, in the present invention, a required number of resin-impregnated base materials are used, and as the resin in this case, an appropriate material such as unsaturated polyester resin, phenol resin, epoxy resin or the like is used. The same applies to the substrate, but examples thereof include glass fiber woven cloth, glass fiber nonwoven cloth, synthetic fiber sheet, mat, and paper. For a long material composed of these base materials, a resin varnish (solution) to which an additive component such as a diluent, a filler or a flame retardant is appropriately added is applied and applied to form a resin-impregnated base material. You can The heat and pressure molding by laminating such a long resin-impregnated base material and a long metal foil can be carried out using a double belt molding machine as illustrated in FIG. 1, for example. That is, as illustrated in FIG. 1, a long metal foil (2) is provided on a predetermined number of upper and / or lower surfaces of a resin-impregnated long base material (1) such as a glass sheet impregnated and impregnated with a predetermined resin. The long laminated body (3) is arranged and made into a laminated body, and this long laminated body (3) is heated and pressed by a double belt molding machine (4). In this molding, a plurality of resin-impregnated long base materials (1) having different thicknesses or different kinds of resin and base material may be used. Further, the long metal foil (2) may be coated with the adhesive (21) in advance on its laminating surface. Such pressure molding is generally 1 to 50, though it varies depending on the type and thickness of the resin and the base material.
It can be performed at a pressure of kg / cm ² and a temperature of 120 to 180 ° C. for about 5 to 30 minutes. Arrangement, size, etc. of the pressing roller (5) and the roller (6) of the double belt molding machine (4) can be appropriately determined. Further, as shown in FIG. 1, the heat-pressed laminated plate is cooled by a cooling furnace (7) and then cut into a predetermined size by a cutter (8), or conversely, by a cutter (8). Cooling furnace after cutting (7)
It can be cooled by means of a laminated plate (9) of a predetermined size. After cutting, the laminate may be reheated in a heating furnace and then rapidly cooled in a cooling tank width to suppress warpage of the laminated plate. Of course, it is needless to say that various aspects are possible for the detailed configuration of the present invention.

In the present invention, as described above, since the thickness variation of the long metal foil is controlled within ± 0.5%, and further within ± 0.25%, the heating and pressure molding is continuously performed. It is possible to significantly reduce the occurrence of waviness, wrinkles, lines, etc., which are defects in the external shape.

【Example】

Example 1 A laminated plate was manufactured by the double belt molding machine shown in FIG. In that case, glass cloth with a thickness of 0.1 mm is placed on the upper and lower sides of a glass nonwoven fabric with a width of 105 cm and a thickness of 0.8 mm, and 50% by weight of an unsaturated polyester resin solution is applied and impregnated on each of them, and then dried. It was Next, a long laminated plate was prepared by laminating a 0.018 mm-thick copper foil with an adhesive on the upper and lower surfaces of the prepreg. 20 kg / cm ² for molding with a double belt molding machine
The molding pressure and the temperature of 140 ° C. were applied for 20 minutes while heating and pressurizing. Then, it cooled, it cut | disconnected by the cutter and the laminated board was obtained. The thickness variation of the long copper foil at this time was set to ± 0.5%. This variation is 10 × 10 cm copper foil
It is evaluated by measuring the weight after cutting. The resulting laminated sheet was evaluated for its appearance defect rate. Table 1 shows the result. From the results of Table 1, it can be seen that in the case of the laminated plate of the present invention, the defect occurrence rate is remarkably reduced as compared with the comparative example (conventional example) described later.

[Table 1] Examples 2 to 3 Similar to Example 1, the thickness variation of the copper foil was ± 0.3.
%, ± 0.2%, a laminated plate was manufactured, and the defect occurrence rate was evaluated. As shown in Table 1, extremely excellent results were obtained. Comparative Example 1 A laminated board was manufactured using a conventional copper foil having a thickness variation of ± 2.0%, and the appearance defect rate was evaluated in the same manner. As shown in Table 1, the rate of occurrence of defects was large, and it adversely affected the circuit formation as a copper clad laminate.

As described in detail above, according to the present invention, it is possible to continuously produce a metal-clad laminate with high productivity while suppressing the occurrence of appearance defects such as waviness, wrinkles and lines.

[Brief description of drawings]

FIG. 1 is a cross-sectional view illustrating a molding process by a continuous double belt molding machine.

[Explanation of symbols]

 1 Resin Impregnated Long Base Material 2 Long Metal Foil 21 Adhesive 3 Long Laminated Plate 4 Double Belt Forming Machine 5 Pressing Roller 6 Roller 7 Cooling Furnace 8 Cutter 9 Laminated Plate

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Hideshi Makino 1048, Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Works, Ltd.

Claims (1)

Claims: 1. When a long metal foil is provided on the upper surface and / or the lower surface of a required number of resin-impregnated long base materials to continuously heat and press-mold a laminated plate, A method for manufacturing a laminated board, which comprises forming the metal foil within a thickness variation of ± 0.5%.