JPH0639866A - Production of laminated sheet and apparatus for heating and curing laminating material - Google Patents

Abstract

PURPOSE:To reduce the outflow of a resin from the laminated base materials sent into a heat-curing apparatus in a method for producing a laminated sheet by superposing a predetermined number of strip like base materials continuously supplied while impregnated with a thermosetting resin one upon another and superposing metal films or release films on both surfaces of the superposed laminated base materials to send the whole into the heat-curing apparatus. CONSTITUTION:A predetermined number of strip like base materials continuously supplied while impregnated with a thermosetting resin are superposed one upon another and metal films or release films 6 are superposed on both surfaces of the superposed laminated base materials 1 and the whole is sent into a heat- curing apparatus to be heated. At this time, the under surface of the laminated base materials sent into the heat-curing apparatus is supported by support rolls 8 and the upper surface thereof is pressed by nip rolls 12 supported in an upwardly floatable manner.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a continuous manufacturing method of laminated boards and an apparatus thereof, and more particularly to a continuous manufacturing method of a metal-clad laminated board used for a printed wiring board and an apparatus thereof.

[0002]

2. Description of the Related Art A continuous manufacturing method has been adopted as a method for manufacturing a laminate for a printed wiring board for the purpose of reducing man-hours, labor and energy. The conventional continuous manufacturing method is to convey a plurality of base materials at the same time, impregnate each base material with a resin varnish, and superimpose them, superimpose metal foil on at least one of the upper and lower surfaces thereof, and then apply pressure. It was a method of moving the inside of a heating and curing device to obtain a laminated plate.

In the continuous manufacturing method of the laminated plate, a resin which is liquid at room temperature is used as the impregnating resin in view of workability and impregnating property. The substrates impregnated with the liquid resin are superposed on each other, and the metal foils are superposed on each other and sent to a heat curing device to cure the resin. The laminated material moves on the support roll in the heat curing device, and its upper surface is pressed by the pressure roll whose gap between the support roll and the support roll is kept constant. This pressurization is for smoothing the surface.

[0004]

However, in the conventional manufacturing method in which the upper surface of the laminated material is pressed by the pressure roll in the heat curing device as described above, the viscosity of the resin is lowered by the heating at the initial stage of heating. Since the fluidity becomes large, the resin may flow out due to pressure and the required plate thickness may not be obtained, and the resin that flows out may adhere to the pressure roll or support roll, and the resin may stain the surface of the laminate. It was

According to the present invention, a strip-shaped base material continuously supplied is impregnated with a thermosetting resin, a predetermined number of the base materials are superposed, and a metal foil or a release film is formed on both surfaces of the superposed base materials. In a method for manufacturing a laminated plate in which the above are stacked and sent to a heating and curing device for heating, it is an object to reduce resin outflow from the laminated base material sent to the heating and curing device.

[0006]

According to the present invention, a strip-shaped base material continuously supplied is impregnated with a thermosetting resin, a predetermined number of the base materials are superposed, and a metal is formed on both surfaces of the superposed base material. In a method for manufacturing a laminated plate in which foils or release films are stacked and sent to a heating and curing device for heating, the lower surface of the laminated base material sent to the heating and curing device is supported by a support roll, and the upper surface is allowed to move upward. It is characterized by being pressed by a supported nip roll.

Further, the heat-curing device for laminating material of the present invention is a heat-curing device for heat-curing the laminating material continuously fed, and comprises a plurality of support rolls for supporting the laminating material, and the laminating material. A nip roll for pressing the upper surface of the material, the nip roll being pivotally supported in the middle thereof, and being pivotally supported at one end of a roll support rod having a counterweight attached to the other end.

Next, the present invention will be described with reference to FIG. As shown in (a) of FIG. 1, a plurality of long base materials 1 wound in a roll shape are guided by a guide roll 13 and guided to a drying oven 2, so that the water contained in the base material 1 is removed. To be removed. The substrate 1 that has exited the drying furnace 2 is guided to the resin impregnation tank 3 and impregnated with the resin whose bubbles have been removed by the resin vacuum degassing device 4. The base material 1 that has left the resin impregnation tank 3 is guided to a heat curing device 7 via a squeeze roll 5. Immediately before the entrance of the heat-curing device 7, the metal foil 6 is introduced to the upper and lower surfaces of the base material 1 via the laminating roll 11 and laminated.
In the case of one-sided metal foil, a release film is laminated on one of the upper and lower surfaces and a metal foil is laminated on the other surface. In the heating and curing device 7, the base material 1 and the metal foil 6 are laminated and integrated, drawn by a drawing roll 9, and cut by a cutting machine 10.

Inside the heat curing device 7, a front chamber 71 and a rear chamber 72 are provided.
And the laminated material is supported by the support roll 8. Further, a nip roll 12 is provided above the intermediate position of the support roll 8 so as to be movable above so as to press the upper surface of the laminated material. As shown in FIG. 1B, the nip roll 12 is pivotally supported in the middle and is pivotally supported at one end of a roll support rod 16 having a counterweight 15 attached to the other end.

The nip roll 12 has a gap adjusting lever 14 so that its lower surface is substantially equal to the height of contact with the upper surface of the laminated material supported by the support roll 8.
Its height is regulated by. In other words, the difference between the height of the upper surface of the support roll 8 and the height of the lower surface of the nip roll 12, that is, the support roll 8 and the nip roll 1
The gap with respect to 2 should be approximately equal to the thickness of the laminate to be manufactured. It is more preferable that the gap be gradually reduced from the inlet to the outlet.

The nip roll 12 is made of metal or hard synthetic resin, and has a roll diameter of 50 to 300 mm and a pitch of 100 to 1000 mm. The load of the nip roll 12 is adjusted by the load of the counterweight 15, and is set to 10 to 100 g per 1 cm of the substrate width.
This value is determined by the viscosity of the resin.

As the base material 1, paper such as kraft paper or linter paper, synthetic fiber cloth or non-woven cloth thereof, for example, glass cloth or glass mat is used. If necessary, the base material 1 is coated with a coupling agent and dried before impregnating the resin.

As the resin with which the base material is impregnated, unsaturated polyester resin, diallyl phthalate resin, vinyl ester resin, epoxy resin and the like are used. further,
Fillers such as aluminum hydroxide, alumina, ceramics, glass and silica are mixed in order to impart flame retardancy and improve dimensional stability. Further, if water or gas is contained in the resin, these remain in the laminated plate and the characteristics are deteriorated. Therefore, the resin is degassed under reduced pressure and then impregnated into the base material.

The resin 1 is impregnated into the base material 1 by dip coating,
A kiss coater, a slit coater, a knife coater, a comma coater, a curtain coater, or the like is used alone or in combination, and a plurality of base materials 1 are individually or collectively coated and impregnated. Further, in order not to leave air bubbles in the base material 1, the resin is attached in excess of the required resin amount, and the squeeze roll 5 or the laminating roll 1
It is preferable to remove the excess resin by 1 and adjust the resin amount. Furthermore, if necessary, it has good compatibility with the resin,
The crosslinkable monomer may be applied to the base material 1 in advance.

As the metal foil 6, a copper foil, an aluminum foil or a stainless foil is used. The metal foil 6 may be laminated at the same time as laminating the plurality of base materials 1, or may be laminated on the resin-impregnated base material by installing another laminating roll 11 as shown in the drawing. At this time, it is desirable that the laminated portion has a resin reservoir between the base material 1 and the metal foil 6.

[0016]

Since the nip roll 12 can move upward, it regulates the upper surface of the laminated plate, but its load is small and constant. Therefore, even if the resin has a low viscosity, it does not flow out from the substrate.

[0017]

【Example】

Example 1 100 parts by weight of a vinyl ester resin, 1 part by weight of benzoyl peroxide, and 100 parts by weight of aluminum hydroxide were mixed. This resin was impregnated into two glass nonwoven fabrics having a thickness of 0.4 mm and two glass cloths having a thickness of 0.2 mm. Resin adhesion amount is 95% glass nonwoven fabric, 60% glass cloth
And When these base materials are superposed, they are conveyed so that glass cloths are arranged above and below the glass non-woven fabric, and copper foils are superposed on the top and bottom surfaces thereof, and the heat curing device 7 shown in FIG. 1 is used. , The set temperature is 80 ° C in the front chamber and 100 in the rear chamber.
C., the gap between the nip roll 12 and the support roll was 1.50 mm, the roll load was 10 to 50 g per 1 cm of the substrate width, and the mixture was passed through the heat curing device for 10 minutes. As a result, a laminated plate having an excellent surface smoothness (Rmax 1.5 μm) without voids and blisters was obtained.

Example 2 100 parts by weight of a vinyl ester resin, 1 part by weight of benzoyl peroxide and 100 parts by weight of aluminum hydroxide were mixed. Eight glass cloths having a thickness of 0.2 mm were impregnated with this resin. The resin adhesion amount was 60%. These base materials are conveyed, copper foils are overlapped on the upper and lower surfaces thereof, and the heat curing device 7 shown in FIG. 1 sets the preset temperature to 80 ° C. in the front chamber and 100 ° C. in the rear chamber. The gap is 1.50 mm, and the roll load is the base material width 1c.
The amount was 10 to 50 g per m, and the mixture was passed through the heat curing device for 10 minutes. As a result, a laminated plate having an excellent surface smoothness (Rmax 1.5 μm) without voids and blisters was obtained.

[0019]

EFFECTS OF THE INVENTION According to the present invention, the wrinkles due to the elongation of the metal foil generated in the heat-curing device are uniformly smoothed, and the resin does not flow, so that the resin does not adhere to the roll and the surface is Laminates that are smooth and have stable quality can be manufactured.

[Brief description of drawings]

FIG. 1 shows an example of an apparatus for carrying out a method for continuously producing a metal-clad laminate according to the present invention, wherein (a) is a schematic diagram of the whole and (b) is a cross-sectional view of a main part.

[Explanation of symbols]

 1 Base Material 2 Drying Oven 3 Resin Impregnation Tank 4 Resin Vacuum Degassing Device 5 Squeeze Roll 6 Metal Foil 7 Heat Curing Device 8 Support Roll 9 Drawing Roll 10 Cutting Machine 11 Laminating Roll 12 Nip Roll 13 Guide Roll 14 Gap Adjusting Lever 15 Counter Weight 16 Roll support rod

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification number Internal reference number for FI Technical location B29D 9/00 7141-4F B32B 5/28 A 7016-4F 15/08 J C08J 5/24 7310- 4F // B29K 105: 06 B29L 31:34 4F

Claims (2)

[Claims] 1. A strip-shaped base material continuously supplied is impregnated with a thermosetting resin, a predetermined number of the base materials are superposed, and a metal foil or a release film is superposed on both surfaces of the superposed base materials. In addition, in the method for manufacturing a laminated plate which is fed to a heating and curing device and heated, the lower surface of the laminated base material fed to the heating and curing device is supported by a support roll, and the upper surface is pressed by a nip roll supported movably upward. A method for manufacturing a laminated board having the characteristics. 2. A heat-curing device for heat-curing a laminated material continuously fed, comprising: a plurality of support rolls for supporting the laminated material; and a nip roll for pressing an upper surface of the laminated material. The nip roll is axially supported in the middle and is also axially supported at one end of a roll support rod having a counterweight attached to the other end thereof.