JP2002370224A - Method and apparatus for impregnating with resin - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method and an apparatus for impregnating with a resin capable of continuously impregnating a fiber base with a liquid-like resin and further improving impregnability of the resin into the base. SOLUTION: The method for impregnating with the resin comprises the steps of impregnating the fiber base with the liquid-like resin from one surface side, and then impregnating the base with the liquid-like resin from another surface side. The apparatus for impregnating with the resin comprises a moving means for moving the base by contacting the base with a forcibly impregnating roll for rotating the base, and a liquid-like resin supply unit for supplying the liquid-like resin between the base and the impregnating roll.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for impregnating a fiber base material with a resin in a novel prepreg manufacturing process.

[0002]

2. Description of the Related Art A prepreg used for a printed wiring board or the like is formed on a fiber base such as paper, glass cloth, synthetic fiber or natural fiber, such as woven or non-woven fabric, by applying a liquid heat such as phenol, epoxy, polyester or polyimide. A curable resin (hereinafter, referred to as a liquid resin) is impregnated, the adhesion amount of the liquid resin is adjusted with a squeeze roll or the like, and the liquid resin is semi-cured by thermal drying.

[0003]

If air bubbles remain in the prepreg, the surface of the prepreg will not be smooth after curing and an uneven surface will be formed, and the prepreg will be poor in heat resistance and the like, and will be stable in performance. There is a problem that cannot be solved.

[0004] Therefore, in order to improve the impregnating property of the liquid resin into the fiber base material, the time and distance of immersion in the liquid resin are set long, and the coating speed is set low.

However, in such a method, the productivity is low, the curing for removing the bubbles is insufficient, the smoothness of the prepreg surface is difficult, and the viscosity must be reduced to increase the amount of the solvent. There are problems such as high costs.

An object of the present invention is to provide a resin impregnating method and apparatus capable of continuously impregnating a fibrous base material with a liquid resin and further improving the impregnation of the fibrous base material with the liquid resin. Is to do.

[0007]

According to the resin impregnating method of the present invention, the fiber substrate is continuously moved by a roll having a specific structure capable of storing a liquid resin between the fiber substrate and the roll. It is characterized by being impregnated with a liquid resin.

Further, the resin impregnating apparatus of the present invention provides a varnish for supplying a varnish between a supply roll for supplying a fiber base material and a forced impregnation roll for forcibly impregnating the liquid resin by pressurizing the liquid resin. It is provided with a supply device, and is further provided with a drying furnace for drying the fiber base material impregnated with the liquid resin.

That is, the present invention resides in a resin impregnation method characterized by impregnating a liquid resin from one side of a fiber base material and then impregnating the liquid resin from the other side.

[0010] More specifically, the present invention provides a liquid resin between the fiber base material and the forced impregnation roll while continuously moving the fiber base material in contact with the rotating forced impregnation roll; The fibrous base material is impregnated with the liquid resin by a forced impregnation roll, and the fibrous base material is further impregnated with the rotating roll while continuously rotating the fibrous base material by a rotating roll. And a resin impregnation method characterized by being immersed in the resin for impregnation.

[0011] It is characterized in that there are at least two stages of supplying the liquid resin between the fiber base material and the forced impregnation roll, and the method further comprises a step of heating and drying the fiber base material after the impregnation.

Further, the present invention provides a moving means for moving a fiber substrate in contact with a rotating forced impregnation roll, a liquid resin supply device for supplying a liquid resin between the fiber substrate and the forced impregnation roll, An impregnation tank for immersing and impregnating the fiber base material in the liquid resin together with the rotary roll while continuously moving the fiber base material by a rotating roll for storing the resin, and a fiber base material impregnated with the liquid resin And a drying furnace for drying the resin.

The forced impregnation roll and the liquid resin supply device are connected and provided in at least two stages, respectively.
Further, the forced impregnation roll has disk flanges of a desired height formed at both ends of the roll surface, and the width of the roll surface is made substantially the same as the width of the fiber base material to prevent leakage of the liquid resin. Can be.

The varnish supply device may be any device as long as it can supply the fiber base material at a constant speed.
What is necessary is just to provide a liquid resin supply port at the bottom of the tank for storing the ordinary liquid resin, and to control the opening degree by a solenoid valve so that the supply speed of the liquid resin becomes constant.

The forced impregnation roll also acts as a pressure roll, as shown in the drawing, has a groove of the same width as the fiber base material to be impregnated, and has a structure in which liquid resin is stored between the fiber base material and the pressure roll. By adjusting the entry angle of the fiber base material, the storage amount can be increased.

According to the present invention, by sandwiching the liquid resin between the forced impregnation roll and the fiber base material, the liquid resin is pressurized from the forced impregnation roll side to generate a pressure difference between the liquid resin and the outside air. By causing the liquid resin to pass through the fiber base material, bubbles in the fiber base material are removed in a short time, and the liquid resin is efficiently impregnated.

Further, by impregnating the liquid resin from one side of the fiber base material, air in the fiber base material can be efficiently removed. The opposite surface can compensate for the small amount of impregnation, so that uniform and efficient impregnation can be obtained as a whole.

[0018]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is an overall configuration diagram of a resin impregnating apparatus according to the present invention. The apparatus of the present invention shown in FIG. 1 includes an impregnation tank 5 for storing a liquid resin 4, a two-stage liquid resin supply device 2 for supplying the liquid resin 4 between a fiber base material 1 and a forced impregnation roll 3, and impregnation of the liquid resin 4. A drying furnace 6 for drying the fibrous base material 1 is provided. The two-stage forced impregnation roll 3 has an outer diameter A: 400 mm, an inner diameter B: 300 mm, a groove width C: 1050 mm, and It has a mechanism for applying pressure. The liquid resin 4 is supplied from the liquid resin supply device 2 to the outside of the container.
It was fed at a speed of 003 m ³ / min.

The forced impregnating roll 3 has disk flanges 9 of desired height formed at both ends of the roll surface 8, and a reservoir for the liquid resin 4 is formed between the fiber base material 1 and the flange 9. Then, the liquid resin 4 is forcibly impregnated into the fibrous base material 1 together with the pressure while being maintained for a predetermined time by the slow rotation. The depth of the reservoir can be adjusted by the height of the collar 9 of the disk.

In this embodiment, the forced impregnation roll 3 and the liquid resin supply device 2 are installed in two stages in succession, so that more efficient impregnation can be performed. And forced impregnation roll 3
Since the impregnation amount on the opposite side of the impregnation side is slightly lower, the impregnation tank 5 can be dipped together with the rotating roll in the impregnation tank 5 to perform uniform impregnation as a whole.

As a device for feeding the fiber base material 1, a drying furnace 6
A winding roll (not shown) is provided at the outlet side of the roll, and winding is performed.
Minutes.

The liquid resin 4 includes a brominated bisphenol A type epoxy resin (manufactured by Dainippon Ink and Chemicals, Inc.).
100 parts by weight (trade name of DER-518) and 3 parts by weight of dicyandiamide were dissolved in 20 parts by weight of ethylene glycol monomethyl ether to prepare a varnish. The viscosity at 30 ° C. of the varnish was 100 mPa · s. This varnish was poured into the impregnation tank 5, and a varnish diluted with a solvent to reduce the viscosity to 30 mPa · s was supplied between the forced impregnation roll 3 and the fiber base material 1. The fiber substrate is a 200 μm thick glass cloth (manufactured by Nitto Boseki Co., Ltd.)
Was used to prepare a prepreg.

In the prepreg thus obtained, the proportion of bubbles per unit area when viewed from the top, that is, the bubble area ratio of the prepreg was 30%.

As a comparative example, a prepreg was manufactured under the same conditions as in the above-mentioned embodiment without using the above-mentioned liquid resin supply apparatus according to the present invention. As a result, the bubble area ratio of the obtained prepreg was 48%.

As is clear from the above, it was confirmed that the resin impregnation apparatus of the present invention has a higher liquid resin impregnation rate and a higher impregnation rate than the conventional method.

[0026]

According to the present invention, the air bubbles in the fiber base material can be efficiently removed in a short time, the impregnation rate of the liquid resin into the fiber base material can be improved at low cost, and the smoothness of the surface can be improved. A high prepreg can be obtained.

[Brief description of the drawings]

FIG. 1 is an overall configuration diagram of a resin impregnation device according to the present invention.

FIG. 2 is a perspective view of a forced impregnation roll according to the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Fiber base material, 2 ... Liquid resin supply apparatus, 3 ... Forced impregnation roll, 4 ... Liquid resin, 5 ... Impregnation tank, 6 ... Drying furnace, 7 ... Receiving tray, 8 ... Roll surface, 9 ... Flange.

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Claims (9)

[Claims] 1. A method for impregnating a resin, comprising impregnating one side of a fiber base with a liquid resin and then impregnating the other side with the liquid resin. 2. A liquid resin is supplied between the fiber base material and the forced impregnation roll while continuously moving the fiber base material in contact with the rotating forced impregnation roll, and the fiber base material is supplied by the forced impregnation roll. A resin impregnation method comprising impregnating a liquid resin under pressure. 3. A liquid resin is supplied between the fiber base material and the forced impregnation roll while continuously moving the fiber base material in contact with the rotating forced impregnation roll, and the fiber base material is supplied by the forced impregnation roll. Pressure impregnating the liquid resin with
A resin impregnating method, wherein the fiber substrate is dipped and impregnated in the liquid resin together with the rotary roll while continuously moving the fiber base by a rotating rotary roll. 4. The resin impregnation method according to claim 1, wherein at least two stages of supplying the liquid resin between the fiber base material and the forced impregnation roll are provided. 5. The resin impregnation method according to claim 1, wherein the fiber substrate is heated and dried after the impregnation. 6. A liquid resin supply device for supplying a liquid resin between the fibrous base material and the forced impregnation roll, the moving means for moving the fiber base material in contact with the rotating forced impregnation roll. Resin impregnation equipment. 7. A moving means for moving the fiber base material in contact with the rotating forced impregnation roll, a liquid resin supply device for supplying a liquid resin between the fiber base material and the forced impregnation roll, and storing the liquid resin. An impregnation tank for dipping and impregnating the fiber base material in the liquid resin together with the rotary roll while continuously moving the fiber base material by a rotating roll, and drying for drying the fiber base material impregnated with the liquid resin A resin impregnation apparatus comprising a furnace. 8. The resin impregnating apparatus according to claim 5, wherein the forced impregnating roll and the liquid resin supply apparatus are connected to each other in at least two stages. 9. A resin impregnating apparatus according to claim 5, wherein said forced impregnating roll has disk flanges of a desired height formed at both ends of the roll surface.