JP3178163B2 - Manufacturing method of laminated board - Google Patents

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 laminate, and more particularly, to a method for continuously manufacturing a metal foil-clad laminate used for a printed wiring board or the like.

[0002]

2. Description of the Related Art In a conventional continuous production method of a metal foil-clad laminate, a long base material such as glass cloth, glass nonwoven fabric, and paper is used. That is, a plurality of required number of sheets are laminated while squeezing the resin with a squeeze roll on the base material impregnated with the resin on the long base material, and further, a long metal foil is formed on one side and a long separation is formed on the other side. Mold film or long metal foils are stacked and passed between laminating rolls arranged up and down,
A method is known in which a long strip-shaped laminate obtained by laminating and integrating is obtained, and the long strip-shaped laminate is heated and cured in a curing chamber, and then cut into required dimensions to continuously manufacture a metal foil-clad laminate. I have.

However, in the continuous manufacturing method, as shown in FIG. 2, the laminating roll (5) includes a curing chamber (4).
Of the laminating roll (5) is expanded by hot air, and the tension by the laminating roll (5) is not uniformly applied. In this case, there is a problem that a void (void) is formed in the laminate, and a laminate manufactured from the laminate (1) is warped or twisted.

[0004]

SUMMARY OF THE INVENTION Accordingly, the present invention provides a method for continuously producing a laminated board, which suppresses the influence of hot air blow from a curing chamber inlet which is received by a laminating roll,
An object of the present invention is to provide a method for manufacturing a metal foil-clad laminate that can prevent warping and twisting of the laminate by reducing open voids in the laminate.

[0005]

According to the present invention, there is provided a method for producing a laminated board, comprising: a step of integrally integrating a long base material impregnated with a resin and a long metal foil by a laminating roll (5); (1), and transfer the laminate (1) to a curing chamber (4) where the resin constituting the laminate (1) is cured.
The laminate (1) conveyed in the curing chamber (4) is heated in the curing chamber (4) to be cured in the laminate (1). The transfer line (3) is sealed by a housing (6), and the pressure in the curing chamber (4) is made lower than the pressure in the housing (6).

[0006]

According to the method for producing a laminate of the present invention, a long base material impregnated with a resin and a long metal foil are continuously integrated with a laminate roll (5) to form a laminate (1). The laminate (1) is transported along a transport line (3) to a curing chamber (4) where the resin constituting the laminate (1) is cured, and the laminate (1) transported to the curing chamber (4) is removed. In the method for producing a laminate which is cured by heating in a curing chamber (4), a laminating roll (5) and a transfer line (3) to a curing chamber (4) are sealed with a housing (6), and a curing chamber (4) is formed. since the pressure of the inner to lower pressure than the pressure in the housing (6), curing
Blowing hot air from the entrance of the chamber (4) into the housing (6)
Dispensing is suppressed, and the laminating roll (5)
The transfer line is
(3) Uniform tension can be applied in the width direction.
In this case, the voids in the laminate (1) can be reduced, and after the laminate (1) is cured, the laminate can be prevented from warping and twisting of a continuously manufactured metal foil-clad laminate by cutting to a required size. .

Hereinafter, the present invention will be described in detail with reference to the drawings. FIG. 1 is a schematic diagram of one embodiment of the present invention.

In the method for producing a laminate according to the present invention, a long base material impregnated with a resin and a metal foil are integrally formed by heating without pressure.

The long base material is a long strip-shaped base material impregnated with a resin, and the resin can be hardened to form an insulating layer later. As a long strip-shaped base material, inorganic fibers such as glass, polyester, polyacrylic, polyvinyl alcohol, polyamide, polyimide, polyphenylene sulphite, organic synthetic fibers such as urethane, woven fabrics made of natural fibers such as cotton, non-woven fabrics,
Mat or paper or a combination of these can be used.

The resin composition to be impregnated into the base material may be an unsaturated polyester resin, an epoxy resin, a polyimide resin, a fluororesin, a phenol resin, a polyphenylene oxide resin, or the like alone, a modified product, or a mixture having a resin amount of 40%.
６０60% by weight (hereinafter simply referred to as%). In addition, the resin composition may include aluminum hydroxide, clay, talc, silica,
A filler such as alumina, magnesium carbonate, calcium carbonate, a synthetic resin powder or a hollow body may be added in an amount of 1 to 200 parts by weight based on 100 parts by weight of the resin. further,
The resin composition may be used as it is, but is preferably used after defoaming under reduced pressure in order to suppress the generation of bubbles in the resin-impregnated base material. The nonwoven fabric substrate is preferably impregnated with the resin composition containing the filler. Further, as the outermost layer metal foil, a copper foil is preferable.

A laminate roll (5) is used to integrate the resin-impregnated base material and the metal foil into a laminate (1). As the laminating roll (5), a metal such as stainless steel, rubber, synthetic resin, or a metal roll surface coated with rubber or synthetic resin can be used as appropriate.

A curing chamber (4) is used for curing and molding the laminate (1). The curing conditions of the resin in the curing chamber (4) can be selected from the curing temperature and the curing time depending on the type of the impregnated resin.
It can be carried out in cm ^2. After cutting, it is preferable that after baking is performed at a temperature equal to or higher than the thermal deformation temperature of the used resin and then cooled to a temperature equal to or lower than the thermal deformation temperature in order to reduce warpage and twist. It is particularly preferable that the cooling is performed by rapid cooling.

The apparatus used in the method for producing a laminate according to the present invention is a device for transporting a laminate (1) between a curing chamber (4) for curing and molding the laminate (1) on a transport line (3). The housing (6) separates the transport line (3) from the laminating roll (5) to the entrance of the curing chamber (4). The pressure in the curing chamber (4) is made lower than the pressure in the housing (6), and the transfer line (3)
Is provided, the influence of the hot air blowing from the inlet of the curing chamber (4) which the laminate roll (5) has received is suppressed. If the pressure in the curing chamber (4) is higher than the pressure in the housing (6), the blowing of hot air from the inlet of the curing chamber (4) into the housing (6) cannot be suppressed, and the laminating roll (5) The laminate (1) obtained by integrating the resin-impregnated base material and the metal foil, or the resin-impregnated base material and the metal foil, receives hot air from the inlet of the curing chamber (4).

If the pressure in the curing chamber (4) is lower than the pressure in the housing (6) as described above, the curing chamber (4)
The blowing of hot air from the inlet of the housing into the housing (6) is suppressed, and the laminate roll (5) expands due to the hot air.
Of the transfer line (3)
Uniform tension can be applied in the direction, the voids in the laminate (1) can be reduced, and the laminate (1) can be reduced.
After curing, a metal foil-clad laminate manufactured continuously by cutting into required dimensions can be prevented from warping and twisting.

[0015]

Examples of the present invention will be described below.

Example 1 As a resin composition, 100 parts by weight of a commercially available vinyl ester resin (R-806DA manufactured by Showa Polymer Co., Ltd.) and 1 part by weight of cumer hydroperoxide were further adjusted so that the viscosity at 25 ° C. became 5 poise. Glass base material (WE-18K-BS manufactured by Nitto Boseki Co., Ltd.) to be a surface layer and a back layer of a resin composition containing styrene
Before impregnating the two sheets continuously and entering a squeeze roll (not shown), the resin was squeezed with a resin squeezing roll so that the resin amount became 30%. Three glass nonwoven fabric substrates of the same shape (EP-4035 manufactured by Japan Vilene Co., Ltd.) forming the core layer contain 45 parts by weight of aluminum hydroxide and 30 parts by weight of clay with respect to 100 parts by weight of the resin of the resin composition. The resin composition to be impregnated was continuously impregnated so that the resin amount was 55%. At the time of impregnation, the glass cloth base material is arranged on both sides of the three glass nonwoven fabric base materials, the resin composition impregnated in each of the resin impregnated base materials is squeezed with a squeeze roll, and integrated with a squeeze roll. The converted resin-impregnated base material is then fed into the housing (6) with the adhesive side of an 18 μm-thick copper foil on the outside positioned on the inside on both sides. Was continuously inserted between the laminating rolls (5), and laminated at 5 kg / cm ² to obtain a long strip-shaped laminate (1). At this time, almost no void was generated. The laminate (1) is sent to a curing chamber (4) via a 5-m transfer line (3), and
The film was cured by heating at 00 ° C. for 20 minutes at 5 kg / cm ² , and then after-cured at 160 ° C. for 20 minutes to obtain a copper-clad laminate.

Comparative Example 1 A long strip-shaped laminate (1) was obtained in the same manner as in Example 1 except that the housing (6) provided in the apparatus of Example 1 was removed. At this time, more open voids occurred than in the case of the first embodiment. Next, the laminate (1) is sent to a curing chamber (4), and is cured by heating at 100 ° C. for 20 minutes at 5 kg / cm ^2.
After curing for minutes, a copper-clad laminate was obtained.

Next, the copper-clad laminates obtained in Example 1 and Comparative Example 1 were evaluated for warpage and twist. A copper foil is melted by etching on a copper-clad laminate cut into a size of 250 mm x 250 mm and dried at room temperature.
It was dried for 5 hours, placed on a smooth surface plate, and the maximum lifting amount was measured with a JIS first-grade gold scale. As a result, the laminate manufactured in Comparative Example 1 was warped by 4 to 5 mm,
The laminate manufactured in Example 1 had a warp of 1 to 2 mm, which was lower than that of Comparative Example 1.

[0019] Similarly, vertical 250mm × horizontal 250mm
The copper foil was melted by etching on the copper-clad laminate cut into pieces, dried at room temperature, dried at 130 ° C. for 1 hour, placed on a flat surface plate, and the maximum lifting amount was measured with a JIS class 1 metal scale. . As a result, the laminate manufactured in Comparative Example 1 had a warpage of 4 to 6 mm, whereas the laminate manufactured in Example 1 had a warp of 1 to 2 mm, which was lower than that of Comparative Example 1. I was able to.

The thickness of the obtained copper-clad laminate was 1.6 mm in Example 1 and the center and the end were the same. In Comparative Example 1, the thickness of the center was small. There was a difference between the thickness of 1.3 mm and the thickness of the end portion of 1.9 mm.

[0021]

According to the method for producing a laminate of the present invention, the effect of hot air blowing from the inlet of the curing chamber, which was received by the laminate roll, can be suppressed, and the voids in the laminate can be reduced. Twist can be prevented.

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing one embodiment of the present invention.

FIG. 2 is a schematic view showing a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Laminated body 3 Transport line 4 Curing room 5 Laminating roll 6 Housing

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) B32B 15/08 B32B 31/20 H05K 1/03

Claims (1)

(57) [Claims] 1. A long base material impregnated with a resin and a long metal foil are continuously integrated with a laminating roll (5) to form a laminate (1), and the laminate (1) is laminated. The resin constituting the body (1) is transported by a transport line (3) to a curing chamber (4) for curing, and the laminate (1) transported to the curing chamber (4) is heated in the curing chamber (4). In the method for producing a laminated board to be cured, a laminating roll (5) and a curing chamber (4) are provided.
The transfer line (3) up to the housing (6),
A method for producing a laminate, wherein the pressure in the curing chamber (4) is lower than the pressure in the housing (6).