JPH11254436A - Resin impregnation device and process for resin impregnation using this device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a resin impregnation device which is less costly and shows a high impregnation performance for a liquid resin into a fiber base as well as a process using this device. SOLUTION: This resin impregnation device comprises a feed roll 11 for feeding a fiber base 1, a payoff device paying off the fiber base 1, an impregnation roll 31 for bringing a liquid resin 2 into contact with the paid-off fiber base 1 and a spare impregnation roll 32 for forcibly impregnating the fiber base 1 with the liquid resin previously prior to bringing the liquid resin 2 into contact with the paid-off fiber base 1 using the impregnation roll 31. In addition, the spare impregnation roll 32 of the resin impregnation device is a columnar roll with an uneven pattern on the circumference. The process for resin impregnation uses the device.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

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

[0002]

2. Description of the Related Art A prepreg used for a printed wiring board or the like is made of a phenolic resin, an epoxy resin, a polyester resin, a polyimide resin, or the like, on a fiber base such as paper, glass cloth, synthetic fiber or natural fiber, or a non-woven cloth. When,
Impregnated with a liquid thermosetting resin (hereinafter referred to as a liquid resin) composed of those curing agents, curing accelerators and solvents,
Adjust the amount of the liquid resin attached with a squeeze roll, etc.
The liquid resin is manufactured in a semi-cured state by thermal drying.

[0003]

By the way, if air bubbles remain in the resin or the fiber base material during the production of the prepreg, the surface of the prepreg will not be smooth after curing, and an uneven surface will be formed, and the solder heat resistance, etc. And there is a problem that a prepreg stable in performance cannot be obtained. For this reason, in order to improve the impregnation property of the liquid resin into the fiber base material, the time and distance for impregnating the liquid resin are set long, and the coating speed is set low. However, in such a method, the productivity is low, the effect of removing air bubbles is insufficient, the smoothness of the prepreg surface is difficult, and the solvent must be increased to reduce the viscosity, resulting in high cost. There are problems such as becoming.

An object of the present invention is to provide a resin impregnating apparatus which is low in cost and excellent in impregnation of a liquid resin into a fiber base material, and a resin impregnating method using the apparatus.

[0005]

According to the present invention, there is provided a resin impregnating apparatus for supplying a fiber base material, a feeding device for unwinding the fiber base material, and bringing a liquid resin into contact with the unwound fiber base material. An impregnating roll, and a pre-impregnating roll for forcibly impregnating the fiber base with the liquid resin in advance before contacting the liquid resin with the impregnating roll, wherein the pre-impregnating roll has a cylindrical roll having irregularities on its circumference. It is characterized by being.

Using this apparatus, a cylindrical roller having a concave and convex shape on a circumference provided by immersing the fiber substrate in a tank storing a liquid resin while unwinding the fiber substrate from a supply roll for supplying the fiber substrate by a feeder. While pre-impregnating the resin by forcibly contacting it with the pre-impregnation roll, pass under the impregnation roll provided in the tank where the liquid resin is stored and contact the fiber base with the liquid resin to impregnate the resin. can do.

This pre-impregnation roll can be performed while rotating at a speed different from the speed at which the fiber base material is unwound, which is preferable because the impregnating property of the resin can be enhanced.

[0008]

According to the present invention, the liquid resin lifted by the pre-impregnation roll presses the liquid resin stored in the concave portion on the circumference by the surface tension to press the resin against the fiber base material. It can be impregnated into a fiber substrate. When impregnating the fiber base with the resin while rotating the pre-impregnation roll at a speed different from the unwinding speed of the fiber base, the pressure for pressing the fiber base increases, and the pressure for penetrating the liquid resin into the fiber base is increased. As the size increases, the impregnation is promoted, and the liquid resin is caused to flow inside, the bubbles in the fiber base material are removed in a short time, and the liquid resin can be efficiently impregnated.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As shown schematically in FIG. 1 (a), a resin impregnating apparatus includes a supply roll 11 for a fiber base material 1, an impregnation tank 21 for storing a liquid resin 2, a preliminary impregnation tank 22, and an impregnation tank 21. An impregnating roll 31 provided so as to be immersed in the liquid resin 2 therein;
A pre-impregnation roll 32 provided in the pre-impregnation tank 22 so as to be immersed in the liquid resin 2;
And a drying furnace 4 for drying the pre-impregnated roll. The pre-impregnated roll 32 has a diameter 40 as shown in FIG.
A cylindrical roller having a circumference of 0 mm, 63 teeth and a gear height of 5 mm and having irregularities on the circumference is used. As a feeding device, a winding roll (not shown) is provided at the outlet side of the drying furnace 4. )
And the take-up speed was 10 m / min, and the pre-impregnation roll 32 was rotated at a speed of 6 m / min in the same direction as the unwinding direction. As the liquid resin, 100 parts by weight of Epicron N-865 (trade name, manufactured by Dainippon Ink and Chemicals, Inc.), a bisphenol A novolak type epoxy resin, 60 parts by weight of bisphenol novolak resin, 1-cyano-ethyl-2 A resin consisting of 0.5 parts by weight of -ethyl-4-methylimidazole and 100 parts by weight of methyl ethyl ketone was used.
A glass cloth having a thickness of 200 μm was used as the fiber base material. In the prepreg thus obtained, the proportion of bubbles per unit area when viewed from above, that is, the bubble area ratio of the prepreg was 30%. As a comparative example, a prepreg was produced under the same conditions as in the above example without using a pre-impregnated roll. As a result, the bubble area ratio of the obtained prepreg was 48%. As is clear from this, it was confirmed that the impregnating device according to the present invention had a higher impregnation rate of the liquid resin than the conventional one.

[0010]

As described above, according to the present invention, it is possible to provide a resin impregnating apparatus excellent in impregnation of a liquid resin into a fiber base material at low cost and a resin impregnating method using the apparatus. .

[Brief description of the drawings]

FIG. 1A is a main block diagram of a resin impregnating apparatus showing one embodiment of the present invention, and FIG. 1B is a perspective view for explaining a structure of a pre-impregnation roll.

[Explanation of symbols]

1. Fiber base material 11. Supply roll 2. Liquid resin 21. Impregnation tank 22. Pre-impregnation tank 31. Impregnating roll 32. Pre-impregnation roll 4. drying furnace

Claims (4)

[Claims] 1. A supply roll for supplying a fiber base material, a feeder for unwinding the fiber base material, an impregnating roll for bringing the liquid resin into contact with the unwound fiber base material, and contacting the liquid resin with the impregnation roll. A pre-impregnation roll for forcibly impregnating the fibrous base material with a liquid resin in advance, wherein the pre-impregnation roll is a cylindrical roll having irregularities on the circumference. 2. The resin impregnation apparatus according to claim 1, wherein the pre-impregnation roll rotates at a speed different from a speed at which the fiber base material is unwound. 3. A cylindrical pre-impregnated roll having a concave and convex shape on a circumference provided by immersing the fibrous base material from a supply roll for supplying the fibrous base material in a tank storing the liquid resin while unwinding the fibrous base material by a feeder. Impregnating the resin by forcibly contacting it with the resin and passing the liquid resin under the impregnating roll provided in the tank storing the liquid resin to bring the liquid resin into contact with the fiber base material. . 4. The resin impregnation method according to claim 3, wherein the pre-impregnation roll is rotated while rotating at a speed different from the speed at which the fiber base material is unwound.