JPH054248A - Continuous manufacturing of laminated sheet - Google Patents

Abstract

PURPOSE:To improve the dimensional accuracy of a molded product and to reduce the warpage thereof in the continuous preparation of a laminated sheet using a solventless liquid resin. CONSTITUTION:A hot air nozzle 11 arranged at a right angle to the advance direction of a base material 1 over the total width of the base material and hot air adjusting covers arranged to both side end parts of the nozzle and slidable in the longitudinal direction of the nozzle are provided to the first furnace chamber 7 of a heating furnace into which a resin impregnated base material is sent and the temp. of the first furnace chamber is made equal to that of the hot air blown out of the nozzle.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for continuously producing a laminated board for electric insulating substrates, which has good dimensional accuracy and little warpage.

[0002]

2. Description of the Related Art Conventionally, in order to continuously manufacture laminated plates,
A material obtained by continuously applying a solventless liquid resin to a long sheet-shaped base material is collected and stacked on one laminating roll, and this is passed through, for example, a double belt type continuous heating and pressing furnace to form a long laminated plate, Cut into a standard size laminate. In this method, it is difficult to adjust the resin content because a solventless liquid resin is used, and the resin content is adjusted again from the time when the excess resin is constantly supplied and a plurality of sheet-shaped base materials are stacked and integrated. There must be. In addition, the liquid resin to be used is required to be a fast-curing resin because the length of the heating and pressing furnace is limited. As a result, it is said that the curing reaction in the heating and pressurizing furnace passes abruptly, the thickness and size of the laminated plate vary greatly, and the warp also increases.

[0003]

The problem to be solved by the present invention is to find a method for improving the thickness and other dimensional accuracy in the continuous production of laminated plates using the solventless liquid resin as described above. However, it is an object of the present invention to provide a method which can be solved by heating conditions in a heating and pressurizing furnace.

[0004]

In order to achieve the above object, when the temperature of the sheet-shaped substrate at the initial stage of feeding into the heating and pressurizing furnace is examined, first, the temperatures at both end portions rise and the temperature in the central portion rises. Found out to be late. This phenomenon occurs even if the temperature in the furnace chamber is made uniform, and it is considered that this phenomenon is the reason why the curing reaction of the resin does not proceed uniformly, and the present invention was completed as a countermeasure. The present invention relates to a laminated plate in which a plurality of systems for applying a solventless liquid resin in a process of continuously transferring a long sheet-shaped base material are gathered in a single laminating roll, and are stacked and fed into a heating and pressurizing furnace for molding. In the continuous production of, a plurality of rows of hot air nozzles having the entire width are provided in the base material feeding first furnace chamber of the heating and pressurizing furnace, and hot air that can slide in the length direction of the nozzles at both end portions of the nozzles. This is a method in which the length of the hot air blowing nozzle in the central portion can be adjusted by attaching an adjusting cover, and the temperature of the first furnace chamber and the temperature of the hot air from the hot air nozzle are equalized. Next, the present invention will be described with reference to the drawings. In FIG.
The long base material 1 is passed through a laminating roll 2 and a resin-coated kiss roll 3, and a copper foil 6 is further layered and enters a first furnace chamber 7 of a heating furnace. This example is an example in which pressurization such as the double belt method is not required only by heating, and it is not necessary to apply pressure in the thickness direction of the base material only by the tension in the traveling direction for transferring the base material. . 2 and 3 show aspects of the hot air nozzle 11 in the first furnace chamber 7, FIG. 2 showing a front cross section at the hot air nozzle position, and FIG. 3 showing a side cross section. The hot air nozzle 11 is positioned at right angles to the direction of travel of the base material and covers the entire width so that the hot air coming out of the nozzle openings strikes the surface of the base material at a right angle. A plurality of hot air nozzles are provided in the first furnace chamber 7, and hot air adjusting covers 12 are attached to both end portions of each hot air nozzle so that the hot air can be blocked, and the hot air nozzles are slid in the length direction of the hot air nozzle. , It is possible to adjust the nozzle length where hot air comes out. That is, the hot air adjusting cover is provided with 30
This adjustment can be made freely within the range of 0 mm. The hot air treatment is not necessary since the sheet-shaped base material inlet in the heating furnace is limited to 2/3 of the length of the heating furnace, and the temperature in the width direction of the base material becomes constant beyond that. The purpose of adjusting the temperature of the surface of the sheet-shaped substrate is to adjust the curing reaction of the impregnated resin. However, since the curing reaction of the resin depends on its composition, the temperature is adjusted in consideration of the resin composition. The adjustment method is performed by sticking a temperature marker in the width direction of the sheet-shaped base material for observation or using a thermocouple. If the temperature in the first furnace chamber 7 is made uniform and the hot air from the hot air nozzle is made to have the same temperature, the amount of hot air blown out is made uniform over the blowing length. In the heating furnace of FIG. 1, the temperature of the second furnace chamber 8 following the first furnace chamber 7 is made higher than that of the first furnace chamber 8 to be uniform. It goes without saying that the method of the present invention can be applied to a double belt type heating and pressurizing furnace,
In that case, the above first furnace chamber is passed through in advance, and then a normal heating and pressurizing furnace is passed through. The sheet-shaped substrate used in the present invention is glass fiber, synthetic fiber, carbon fiber, or inorganic fiber, and the thickness thereof is a combination of 0.05 to 0.5 mm. The resin used is a solventless liquid thermosetting resin, and a curing agent suitable for each resin is used. The preset temperature for carrying out the present invention is in the range of 50 to 150 ° C., considering various combinations of resin and curing agent.

[0005]

[Function] Generally, in continuous production of laminated plates, when the resin-impregnated base material is fed into the heating and pressurizing furnace, the temperature of both side edges of the base material rises quickly at the initial stage of the feeding. The rise is delayed. The reason is that the heat capacity at the end is smaller than that at the center. This phenomenon occurs even if the temperature in the heating chamber is adjusted to a constant value. Therefore, the curing reaction of the impregnated resin does not proceed uniformly, resulting in poor product dimensional accuracy and warpage. However, according to the method of the present invention, the curing reaction proceeds uniformly without the partial slowing of the temperature rise as described above, and the accuracy of the product dimension is good.

[0006]

EXAMPLE A long sheet-shaped substrate 1 shown in FIG.
A material was obtained by sandwiching two glass mats having a thickness of 0.30 mm between two glass cloths having a thickness of 50 mm and a thickness of 0.20 mm. A composition obtained by stacking these three sets on a roll 2 and then mixing 100 parts of an unsaturated polyester resin (Hitachi X-6835), 85 parts of aluminum hydroxide (Hijirite 42M), and 1 part of a curing agent perbutyl ZT in this mixture and degassing. 4 to 10
It was coated and impregnated with a m / m 2 kiss roll 3 to have an adhered resin content of 85%. Further, the resin-impregnated base material was combined with 35 μ copper foil 6 by a roll 5 and fed into a heating furnace. In the heating furnace, the temperature of the first furnace chamber 7 was set to 100 ° C.
A hot air adjustment cover was attached to 00 mm. Next, the temperature of the adjacent second furnace chamber 8 is set to 120 ° C.
It was set to 0 ° C. The continuous molding speed was 4 m / m.

As a comparative example to the example, molding was performed at a speed of 4 m / m in the same manner as the example except that a hot air nozzle was not provided. 1.6 mm of the copper-clad laminates obtained in Examples and Comparative Examples
The values measured after treatment at 70 ° C. for 15 minutes are shown in Table 1. A sample of 300 × 300 mm was used for measuring the warp value.

[0008]

[Table 1]

[0009]

EFFECTS OF THE INVENTION According to the method for continuously producing a laminated sheet using the solventless liquid resin of the present invention, the resin is uniformly cured over the entire surface of the sheet-shaped substrate, and as a result, there is little dimensional change such as sheet thickness and warpage. A small molded product was obtained.

[Brief description of drawings]

FIG. 1 is an explanatory view of continuous production of a laminated board of the present invention.

FIG. 2 is a partial explanatory front view of the present invention in FIG.

FIG. 3 is a side view of FIG.

[Explanation of symbols]

1 sheet base material 2 combined rolls 3 kiss rolls 4 resin tank 5 combined rolls 6 copper foil 7 First furnace room 8 Second furnace room 9 Guide roll 10 hot air tubes 11 hot air nozzle 12 Hot air adjustment cover 13 cutting machine 14 Copper clad laminate

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification number Reference number within the agency FI Technical indication location B29K 105: 06 (72) Inventor Kazuo Kobayashi 2-1-1 Nishishinjuku, Shinjuku-ku, Tokyo Hitachi Chemical Industrial Co., Ltd. (72) Inventor Akira Shimizu 1500 Ogawa, Shimodate City, Ibaraki Prefecture Hitachi Chemical Co., Ltd. Shimodate Factory

Claims (2)

[Claims] 1. A plurality of systems, which are coated and impregnated with a solventless liquid resin in a process of continuously transferring a long sheet-shaped substrate, are gathered and stacked on one laminating roll, and are fed into a heating and pressurizing furnace to be molded. In the continuous production of laminated plates, a plurality of rows of hot air nozzles having the entire width of the base material feeding first furnace chamber of the heating and pressure furnace are provided.
A hot air adjusting cover that can slide in the length direction of the nozzle is attached to both end portions of the nozzle so that the length of the hot air blowing nozzle in the central portion can be adjusted, and the temperature of the first furnace chamber and the hot air temperature from the hot air nozzle are further adjusted. And a method for continuously producing a laminated plate, wherein: 2. The laminated plate according to claim 1, wherein the length of the hot-air treatment in the substrate transfer direction by the hot-air nozzle provided in the first furnace chamber is set to ⅔ or less of the length of the heating and pressurizing furnace. Continuous manufacturing method.