JP2734172B2 - Impregnation method and impregnation equipment for resin varnish - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for continuously impregnating a long sheet-like base material with a resin varnish prior to production of a prepreg used for forming a laminate or the like.

2. Description of the Related Art A laminate is obtained by laminating a prepreg obtained by impregnating a resin-like varnish into a sheet-like base material and drying the resultant, and then subjecting the prepreg to heat and pressure molding. Conventionally, the impregnation of the sheet-like base material with the resin varnish is performed by the following means.

That is, a long sheet-like base material is continuously immersed in a vat in which a large amount of resin varnish is stored, pulled up, and led to a drying step. A circulation system is used in which an extra resin varnish is supplied into the vat, the varnish overflowing from the vat is returned to the tank, and the viscosity is adjusted and then supplied to the vat again.

Problems to be Solved by the Invention In the conventional impregnating means, when the varnish overflowing from the vat is returned to the tank, there is volatilization of the solvent and a change in the viscosity, and the viscosity must be adjusted in the tank. In addition, there is a problem that foreign matters and air bubbles are apt to be mixed into the varnish during circulation of the varnish, so that the impregnation operation cannot be performed smoothly or the appearance of the laminate manufactured through this process is deteriorated.

It is an object of the present invention to provide an impregnation method that does not circulate a resin varnish that easily causes the above-described problems, and to provide an apparatus used for the impregnation method.

Means for Solving the Problems The impregnation method and the apparatus according to the present invention will be described with reference to the drawings of the embodiments.

The resin varnish tank 2 is constituted by a plurality of rotating rolls 1a, 1b... 1f which are in contact with each other, and side plates (not shown) which are in contact with the end faces of the roll group. A fixed amount of resin varnish is supplied from the tank 3 to the resin varnish tank 2.

While supplying a fixed amount of resin varnish, the long sheet-shaped base material 4 is continuously guided from one gap of the roll group to the resin varnish tank. Then, the base material impregnated with the resin varnish is drawn out from another gap of the roll group.

In the method and the apparatus according to the present invention, the resin varnish in the resin varnish tank 2 is impregnated into the sheet-like substrate 4, and the amount of the resin varnish in the resin varnish tank 2 decreases as the sheet-like substrate 4 moves. Will be reduced. However, the resin varnish supplies a fixed amount from the tank 3 to the resin varnish tank 2, and the impregnation work is performed while supplying the resin varnish. It eliminates the need for circulation.

Example Next, an example of the present invention will be described.

Apart from the resin varnish tank 2 composed of the roll group and the side plate described above, in order to further configure a resin varnish tank,
.. 11d were added to the above-mentioned roll group to form a resin varnish bath 21. And resin varnish tanks 2 and 21
Were connected by a pipe.

In this configuration, a fixed amount of resin varnish is supplied from the tank 3 to the resin varnish tank 2 by the pump 5, and the overflowed resin varnish moves to the resin varnish tank 21 here. Since the impregnation of the sheet-like base material 4 is performed in both the resin varnish tanks 2 and 21, it is possible to sufficiently impregnate the required amount of the resin varnish.

Different resin varnishes may be separately supplied to the resin varnish tanks 2 and 21. This enables two-stage impregnation of the undercoat and the overcoat.

By passing a heat medium through the rotating roll in contact with the resin varnish, the varnish in the resin varnish tank can be maintained at an appropriate temperature, and the impregnation work can be performed under more appropriate conditions.
The varnish adhering to the roll surface once goes out of the resin varnish tank with the rotation of the roll and returns to the resin varnish tank again, so that a slight change in the viscosity of the resin varnish is considered. However, if necessary, by contacting each roll with a doctor knife 6 outside the resin varnish tank, the varnish that has been discharged can be removed, and the varnish can be prevented from being re-introduced into the inside, so that the viscosity of the resin varnish changes. Can be suppressed.

Further, by making adjacent rolls a combination of a hard roll and a soft roll, the adhesion between the rolls is improved.

Effect of the Invention As described above, the use of the method and apparatus according to the present invention enables the impregnation of the substrate by supplying only the required amount without circulating the resin varnish. As a result, no foreign matter or bubbles are mixed into the resin varnish, and a smooth impregnation operation and the production of a laminate having a good appearance can be achieved.

Further, since the impregnation work is performed in a closed space, the evaporation of the solvent is suppressed, and the working environment is also safe.

[Brief description of the drawings]

FIG. 1 is an explanatory side view showing an embodiment of the method and the apparatus according to the present invention. 1a, 1b ... 1f are rotating rolls, 2 is a resin varnish tank, 3 is a tank, 4 is a sheet-like substrate, and 5 is a pump.

Claims (7)

(57) [Claims] 1. A resin varnish tank is constituted by a plurality of rotating rolls which are in contact with each other and a side plate abutting on an end face of the roll group, and a fixed amount of resin varnish is supplied to the resin varnish tank.
A resin varnish impregnation method comprising impregnating a long sheet-like base material guided from a roll gap to a resin varnish tank with a resin varnish, and extracting the impregnated base material from the roll gap. 2. The resin varnish according to claim 1, wherein a plurality of resin varnish tanks are arranged, the resin varnish overflowed in one resin varnish tank is led to another resin varnish tank, and impregnation is performed in the plurality of resin varnish tanks. Impregnation method. 3. The method for impregnating a resin varnish according to claim 1, wherein a plurality of resin varnish tanks are arranged, and the impregnation is performed in the plurality of resin varnish tanks while supplying a different amount of resin varnish to each resin varnish tank. 4. A resin varnish tank comprising a plurality of rotating rolls in contact with each other and a side plate abutting on an end face of the roll group, wherein a gap between one roll of the roll group is an inlet for a long sheet-like base material, An apparatus for impregnating a resin varnish with another roll gap as an outlet and a means for supplying a resin varnish to the resin varnish tank. 5. The resin varnish impregnating apparatus according to claim 4, wherein the adjacent rolls are a combination of a roll having a soft surface and a roll having a hard surface. 6. The resin varnish impregnating apparatus according to claim 4, wherein a doctor knife abuts the roll outside the resin varnish tank. 7. The heating device according to claim 4, wherein the heating means is incorporated in the roll.
An apparatus for impregnating a resin varnish according to any one of the above.