JPH06218751A - Production of laminated sheet - Google Patents

Abstract

PURPOSE:To enhance the thickness accuracy of a laminated sheet by continuously molding a long laminate wherein long metal foils are arranged on the upper and rear surfaces of a predetermined number of long phenol resin impregnated base materials under heating and pressure using a double belt molding machine and cutting the molded one to reheat the same to suppress the generation of smearing and warpage. CONSTITUTION:Long metal foils 2 are arranged on the upper and rear surfaces of a predetermined number of resin impregnated base materials such as glass sheets impregnated with a phenol resin to form a long material 3 which is, in turn, heated and pressed by a double belt molding machine 4 to be formed into a laminated sheet. This laminated sheet is cut into a predetermined dimension by a cutter 7 to be reheated in a heating furnace 8. By this method, a phenol resin double-side metal foil clad laminated sheet 9 is obtained. The laminated sheet 9 is suppressed in the generation of smearing and warpage due to reheating treatment and also enhanced in thickness accuracy.

Description

Detailed Description of the Invention

[0001]

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 is a new continuous method useful for electric / electronic devices, communication devices, computers, etc., capable of producing a laminated board for a printed wiring board, which suppresses the occurrence of smear and warp with high thickness accuracy. The present invention relates to a manufacturing method.

[0002]

2. Description of the Related Art Conventionally, electrical and 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 the demand for the improvement of such technology, various improvements have been made in the constitution of the resin, the additive and the like of the laminated plate. At present, as a heat-resistant electrical laminate, a laminate made of an epoxy resin-impregnated base material is generally widely used.

[0004]

However, in spite of various improvements and improvements so far, conventional laminates using epoxy resin are useful as general-purpose heat-resistant electrical laminates, but smear However, in the case of the conventional press production method that is a conventional method for forming laminated plates, there is an unavoidable disadvantage that the thickness accuracy is low.

Therefore, it has been desired to realize a new manufacturing method of a laminated plate which is cheaper and has good heat resistance, does not cause smear, and has excellent thickness accuracy.
The present invention has been made in view of such circumstances, and solves the drawbacks of conventional epoxy resin laminates, does not cause smear, and produces a heat-resistant laminate with good thickness dimension accuracy. It is intended to provide a way.

[0006]

In order to solve the above problems, the present invention provides a long laminate in which a long metal foil is provided on the upper surface and / or the lower surface of a required number of phenol resin-impregnated long base materials. Provided is a method for producing a laminated plate, which comprises continuously heating and pressing a body by a double belt molding machine, cutting the body into a predetermined size, and then heating the body again.

In the production method of the present invention, the above-mentioned phenol resin-impregnated long base material is used as the base material, and in this case, various known phenol resins are used. For example, any of the novolac type phenolic resin and the resol type phenolic resin are also preferable. Further, the phenol resin may be modified by melamine modification, epoxy modification, or the like.

These phenolic resins can be impregnated into the base material as a solution or varnish containing water, a diluent such as acetone, an inorganic filler, a viscosity modifier, a flame retardant, etc., if necessary. . Substrates therefor, that is, the long substrate in the present invention, glass fiber,
Synthetic fiber woven cloth, non-woven cloth, paper, and other general paper can be used.

As a metal foil for integrally molding in a double belt molding machine, copper, aluminum, iron, nickel, which has been conventionally used for printed wiring boards,
It is a foil of a metal such as zinc or an alloy, and if necessary, an adhesive layer may be provided on one surface thereof for molding. For heating and pressurizing with a double belt molding machine, for example, as illustrated in FIG. 1, a predetermined number of upper surfaces of resin-impregnated long base materials (1) such as a glass sheet impregnated with a predetermined phenolic resin and / Alternatively, a long metal foil (2) is arranged on the lower surface to form a long body (3), and the long laminate (3) is heated and pressed by a double belt molding machine (4). This molding is generally carried out at a pressure of 1 to 50 kg / cm ² and a temperature of 140 to 180 ° C. for 5 to 3
It can be performed in about 0 minutes.

In this molding, the metal foil (2) may be provided with an adhesive layer (21) in advance. Arrangement, size, etc. of the pressing roller (5) and the roller (6) of the double belt molding machine (4) can be appropriately determined. The heat-pressed laminated plate is cut into a predetermined size by a cutter (7) as illustrated in FIG. 1, and is reheated in a heating furnace (8). The temperature at this time is generally 100 to 150 ° C., and it is preferable to perform heat treatment for 20 to 60 minutes. Thus, the phenol resin double-sided metal-clad laminate (9) having a predetermined size is obtained.

Needless to say, the detailed configuration is not limited to the above example, and various modes are possible.

[0012]

In the present invention, since continuous molding is carried out using a long base material impregnated with phenol resin and reheat treatment is carried out, smear does not occur because the heat distortion temperature of the phenol resin is essentially high. Moreover, since the sheets are continuously produced one by one, the thickness accuracy can be adjusted one by one as compared with the conventional method which employs a multi-stage press molding method of about 20 to 30 stages in each stage. Also, no warpage occurs due to reheating.

Therefore, it is possible to produce a laminated plate having good heat resistance with high dimensional accuracy and high efficiency without generating smear.

[0014]

【Example】

Example 1 A laminated plate was manufactured by the double belt molding machine shown in FIG. At that time, each of three long glass cloths having a width of 105 cm and a thickness of 0.15 mm was impregnated with a methyl alcohol solution of 50% by weight of a resole-type phenol resin, and then the upper and lower surfaces of the dried prepreg had a thickness of 0.035 mm. The long-sized laminated body in which the copper foil with the adhesive of 1 was stacked was used.

Molding with a double belt molding machine is 30 kg /
It was carried out by heating and pressurizing at a molding pressure of cm ² and a temperature of 160 ° C. for 10 minutes. Then, it was cut into 100 cm thick pieces with a cutter to obtain a laminated board having a thickness of 0.6 mm, and again heated at 120 ° C for 60 minutes to obtain a predetermined laminated board. For this laminate,
The occurrence of smear, dimensional accuracy, and warpage due to drilling was evaluated. As shown in Table 1, generation of smear and warpage was suppressed, and the thickness dimensional accuracy was excellent.

Example 2 A laminated board was produced in the same manner as in Example 1 using a novolac type phenol resin. The performance evaluation was also good as shown in Table 1. Comparative Example 1 A glass cloth having a size of 105 × 105 cm and a thickness of 0.15 mm was impregnated with a methyloxytol solution of 45% by weight of an epoxy resin and dried, and the same copper foil as in Example 1 was laminated on the top and bottom of the prepreg to have a thickness. It is sandwiched between 1 mm slantless plates, 15 sets are inserted in the step, and pressure is 35 kg / cm ² and temperature is 170 ° with a 30-step press.
The laminate was heated and pressed at C for 120 minutes to obtain a laminate having a thickness of 0.6 mm.

The performance of this laminated plate was also evaluated. The results shown in Table 1 were shown, but smear was generated, and the accuracy of the thickness dimension was not preferable. Comparative Example 2 In Example 1, reheating was not performed.

As shown in Table 1, the performance in this case was large in warpage.

[0019]

[Table 1]

[0020]

As described in detail above, according to the present invention, it is possible to manufacture a heat-resistant laminated plate in which generation of smear and warp are suppressed with high thickness accuracy.

[Brief description of drawings]

FIG. 1 is a process sectional view illustrating a manufacturing method of the present invention.

[Explanation of symbols]

 1 Phenolic Resin Impregnated Long Base Material 2 Long Metal Foil 3 Long Laminate 4 Double Belt Forming Machine 5 Pressing Roller 6 Roller 7 Cutter 8 Heating Furnace 9 Phenolic Resin Double Sided Metal Clad Laminate

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification code Office reference number FI technical display location B29K 105: 08

Claims (1)

[Claims] 1. A long laminated body in which a long metal foil is provided on the upper surface and / or the lower surface of a required number of phenol resin-impregnated long base materials is continuously heated and pressed by a double belt molding machine to obtain the required material. A method for manufacturing a laminated board, which comprises cutting the sheet into the dimensions described above and then heating again.