JPH06198760A - Laminated sheet manufacturing apparatus - Google Patents

Abstract

PURPOSE:To prevent that air bubbles are left in a product by the involution of air or rib like longitudinal stripes are formed on the surface layer of the product when base materials impregnated with a liquid resin are superposed one upon another to continuously produce a laminated sheet. CONSTITUTION:In a laminated sheet manufacturing apparatus wherein a plurality of continuously fed resin soln. impregnated base materials 1 are sent into a molding gap to be superposed one upon another and, subsequently, metal foils 4 are laminated to the superposed base materials by a laminating roll 3 and, continuously, the resin infiltrated in the base materials is cured to produce a laminated sheet, two doctor knives 2, 2 are opposed to each other to form the molding gap. Resin soln. supply passages 9 are provided in the doctor knives 2 to supply a resin when the resin soln. impregnation amt. of the base materials is insufficient.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for producing a laminate used for producing a printed wiring board or the like.

[0002]

2. Description of the Related Art There are a batch method and a continuous method as methods for producing laminated plates. The batch method is a method in which a base material impregnated with a resin is heated to semi-cure the resin to form a prepreg, the prepreg is cut, a plurality of the prepregs are stacked, and heated and pressed by a flat plate press.

The batch method has a problem in productivity, and a method of continuously molding a long prepreg has been proposed (see, for example, Japanese Patent Publication No. 57-28334). This method
The prepreg is wound into a roll without being cut, and the prepreg wound into a roll is unwound and continuously supplied, and metal foil is also continuously supplied and laminated, and thermocompression molded through a series of heating and pressing devices. Is the way to do it.

By further developing this method, a method has been proposed in which a base material is impregnated with a liquid resin, and the resin is not semi-cured, and heat molding is performed on a consistent line (for example, Japanese Patent Laid-Open No. 56-56). 144151, JP-A-57-4
9294).

In this continuous manufacturing method, a roll is used as a device for superposing resin-impregnated base materials.
It has been proposed that this roll rotates in the traveling direction of the base material impregnated with the resin and that it remains stationary.

[0006]

In the case where the roll rotates in the traveling direction of the base material, the resin may be adhered to the roll and peeled off, or air may be entrained to leave bubbles in the product. As shown in FIG. 2, the resin-impregnated base material 1 is passed between stationary (non-rotating) rolls 10 so that excess resin is squeezed by the rolls 10 to form a resin pool 11. Does not show any drawbacks such as the one that rolls. However, when the viscosity of the resin becomes high or the line speed becomes high, the ribs 12 are formed on the surface layer.
There was a case where a rib-shaped vertical streak 13 was formed.

The present invention leaves no bubbles in the product, and
It is an object of the present invention to provide a laminated plate manufacturing apparatus in which rib-shaped vertical stripes 13 cannot be formed.

[0008]

According to the present invention, a plurality of resin liquid-impregnated substrates 1 which are continuously conveyed are superposed by feeding them into a molding gap, and then a metal foil 4 is laminated by using a laminating roll 3. In a laminated plate manufacturing apparatus in which the resin impregnated in the base material is subsequently cured.
This is an apparatus for manufacturing a laminated plate in which two doctor knives 2 and 2 face each other to form the molding gap (FIG. 1 (a)).
reference).

FIG. 1B shows a doctor knife provided with a resin liquid supply passage 9. The resin liquid supply passage 9 is provided to supplement the resin when the resin liquid impregnation amount of the base material 1 is insufficient.

The manufacturing apparatus of the present invention will be described below with reference to the drawings. A long continuous resin liquid-impregnated base material 1 is pulled out from a molding gap formed by a pair of upper and lower doctor knives 2 and stacked. After that, the metal foils 4 which are unwound from above and below are laminated with a laminating roll 3 to form a laminated body 5. The doctor knife forming the molding gap may be a comma roll.

The doctor knife 2a forming the molding gap shown in FIG. 1 (b) has a structure capable of applying the resin liquid pressure-fed by the resin liquid supply pump 7 to the substrate 1 through the supply passage 9. The length L of this doctor knife 2 is
It is appropriately determined depending on the shape of the supply passage 9 and the surface accuracy after coating.

[0012]

Since the resin liquid-impregnated base material 1 is pulled out from the molding gap constituted by the doctor knife 2, air bubbles are not entrapped due to peeling of the base material. Further, as shown in FIG. 2, since the contact surface with the base material does not gradually expand like a static arc curved surface, ribs are not formed and a good coated surface without vertical stripes can be obtained.

[0013]

[Examples] A vinyl ester resin having a viscosity of 1.5 Pa · s was used, the top and bottom substrates were glass cloths having a basis weight of 210 g / m ² , and the base material (core material) was 100 g / basis weight. m ²
A laminated sheet was manufactured by using one piece of the glass non-woven fabric as described in (1) and a copper foil having a thickness of 18 μm as a metal foil. The feed rate of the base material was 2.0 m / min. For comparison, a laminate was manufactured under the same conditions using a forming gap using a stationary roll.

As a result, the number of voids examined with a stereoscopic microscope was "0" for both in 1 cm ² . Further, the surface accuracy of the laminate measured with a surface roughness meter of 50 mm span is 1 for the laminate produced using the production apparatus of the present invention.
It was 2.5 μm. On the other hand, the laminate produced using the forming gap with the stationary roll was 27 μm.

[0015]

According to the present invention, as the molding gap,
Since the doctor knife is used, it is possible to manufacture a laminated plate having no metal bubbles and having a metal foil surface precision equal to or higher than that of the flat plate pressing method.

[Brief description of drawings]

FIG. 1 shows an embodiment of the present invention, (a) is a schematic view of a manufacturing apparatus using a normal doctor knife, and (b) is a schematic view showing an example in which a resin liquid supply passage is provided in the doctor knife. It is a figure.

FIG. 2 is a schematic view of a conventional manufacturing apparatus.

[Explanation of symbols]

 1 Resin Liquid Impregnated Base Material 2 Doctor Knife 3 Laminating Roll 4 Metal Foil 5 Laminate 7 Resin Liquid Supply Pump 9 Resin Liquid Supply Passage 10 Roll 11 Resin Pool 12 Rib 13 Vertical Strip

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yoshinori Sato 1500 Ogawa, Shimodate City, Ibaraki Prefecture Hitachi Chemical Co., Ltd. Shimodate Factory

Claims (2)

[Claims] 1. A plurality of resin liquid-impregnated base materials that are continuously conveyed are superposed by feeding them into a molding gap,
Next, in a laminated plate manufacturing apparatus for laminating a metal foil using a laminating roll and subsequently curing a resin impregnated in a base material, a laminated plate in which two doctor knives are opposed to each other to form the molding gap. Manufacturing equipment. 2. The laminated plate manufacturing apparatus according to claim 1, wherein the doctor knife is provided with a passage for supplying the resin liquid to the base material.