JP3307202B2 - Pre-preg manufacturing equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a prepreg manufacturing apparatus for manufacturing a laminated board for a printed wiring board or a multilayer printed wiring board.

[0002]

2. Description of the Related Art A prepreg transports a long sheet-like base material (woven or non-woven fabric of glass fiber or synthetic resin fiber, paper, etc.) and continuously transfers the same to a thermosetting resin (epoxy resin, phenol resin). (Resin, unsaturated polyester, polyimide, etc.), and dried. In the method of manufacturing a prepreg while transferring a long sheet-like base material as described above, a tensile stress is always applied to the base material during the manufacturing process, and a tensile stress remains in the manufactured prepreg.

A laminated board formed by heating and pressing using the above prepreg, and a printed wiring board and a multilayer printed wiring board obtained by processing the same, are liable to be warped or twisted due to tensile stress remaining in the prepreg. ,Also,
The dimensional change due to the heat treatment is large. As means for solving such a problem, there has been proposed a technique for removing a residual stress in a prepreg before molding by heating a prepreg cut to a predetermined size to a temperature higher than a softening point of a resin without applying tension. (JP-A-3-81122). Specifically, in the case of an epoxy resin prepreg (resin softening temperature 100 ° C.), 30 ° C. is placed in an oven at 150 ° C.
It is a method of leaving it for seconds and taking out and cooling.

[0004]

The above-mentioned conventional technique of heating a prepreg without applying tension is a batch process and is inefficient. A problem to be solved by the present invention is to efficiently perform a process of heating a prepreg cut to a predetermined size to a temperature higher than a softening point of a resin.

[0005]

Means for Solving the Problems In order to solve the above problems, a prepreg manufacturing apparatus according to the present invention continuously impregnates a thermosetting resin while transferring a long sheet-like substrate. An apparatus for heating a prepreg, which has been dried and cut to a predetermined size, to a temperature higher than a softening point of a resin without applying tension, and has the following configuration. First, the heating means is a near-infrared halogen lamp. A means for transferring the prepreg cut to the predetermined size under the near-infrared halogen lamp is a non-metallic conveyor belt.
The conveyor belt is in contact with the cooling means. The cooling means is, for example, a roll wound on a conveyor belt.

A prepreg cut to a predetermined size is placed on a conveyor belt and passed under a near-infrared halogen lamp.
Since the near-infrared halogen lamp can easily collect light and can obtain a high temperature, the heating furnace can be shortened. Since the conveyor on which the prepreg is mounted is made of a nonmetal, heat conduction to the conveyor belt is small, and heat can be efficiently supplied to the prepreg. In addition, the cooling means prevents the temperature of the conveyor belt from becoming too high during long-time operation.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS While transferring a long glass woven fabric substrate, it was continuously impregnated with an epoxy resin and dried to prepare a prepreg 1 cut to a predetermined size. Prepreg 1
Is placed on a conveyor belt 2 having a cloth coated with a fluororesin and passed through a heating furnace equipped with a near-infrared halogen lamp 3. The conveyor belt 2 is driven by a roll 4. The cooling water is passed through the roll 4. When the prepreg was passed through the above device for 5 seconds, the prepreg was 12
The temperature was raised to 0 ° C. The heat-treated prepreg is subsequently sent to a cool air zone 5 for cooling to room temperature. The cooling belt 6 may be brought into contact with the conveyor belt 2 for cooling.

[0008]

EXAMPLE An epoxy resin laminate was formed using the above prepreg, and the effect of the prepreg heat treatment was confirmed. The incidence of poor twisting (floating height at the four corners of 0.5 mm or more) of the formed laminate of 500 × 500 mm was 0.05% (2% in the conventional example in which the prepreg was not heat-treated). Further, the dimensional shrinkage after the heat treatment of the laminated board was reduced by 30% as compared with the conventional example. Furthermore, the above molded 500 × 50
Table 1 shows the results of measuring the warp of the 0 mm laminate.

[0009]

[Table 1]

[0010]

As described above, according to the apparatus according to the present invention, when a prepreg cut to a predetermined size is subjected to heat treatment in a state where tension is not applied, the heat treatment can be performed efficiently and in a short time. Although the heat treatment of the prepreg is a short time, the laminate formed using the prepreg has a sufficiently small warp and twist, and a small dimensional change after the heat treatment.

[Brief description of the drawings]

FIG. 1 is an explanatory side view of an apparatus according to an embodiment of the present invention.

[Explanation of symbols]

 1 is a prepreg 2 is a conveyor belt 3 is a near-infrared halogen lamp 4 is a roll 5 is a cool air zone 6 is a cooling jacket

Claims (2)

(57) [Claims] 1. While transferring a long sheet-like base material, continuously impregnating and drying a thermosetting resin, and heating a prepreg cut to a predetermined size to a temperature higher than the softening point of the resin without applying tension. An apparatus for producing a prepreg to be processed, wherein the heating means is a near-infrared halogen lamp, and the means for transferring the prepreg cut to the predetermined size under the near-infrared halogen lamp is a non-metallic conveyor belt. An apparatus for producing a prepreg, which is in contact with a cooling means. 2. The prepreg manufacturing apparatus according to claim 1, wherein the cooling means is a roll wound on a conveyor belt.