JPH08229943A - Apparatus for impregnation with resin - Google Patents

Abstract

PURPOSE: To facilitate manufacture of a prepreg which is uniform in resin distribution on both front and rear surfaces by stabilizing viscosity by a method wherein a resin feeder for supplementation of resin varnish a temperature and a viscosity of which are controlled is annexed to a position where the resin is difficult to be circulated and apt to stay since a base material becomes a baffle. CONSTITUTION: A supplementary resin varnish feeder 10 is provided on an upper surface of an impregnation bath 1. Resin varnish 3 a temperature and a viscosity of which are controlled in the same way as for the resin varnish feeder 2 is supplementarily constituted in a part 8 enclosed by a base material 6 on a side in contact with a roll 4 in the bath on the upper surface side of the impregnation bath 1. Since the part 8 is a position where the resin varnish 3 is difficult to be circulated and apt to stay in the impregnation bath 1, a difference in viscosity of the resin varnish 3 is generated between a non-contact side part 9 of the roll 4 in the bath and that position. However, since the resin varnish 3 the temperature and viscosity of which are controlled is compulsorily fed from the supplementary resin feeder 10, stabilization of the viacosity of the resin varnish 3 in the impregnation bath 1 can be achieved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a resin impregnating apparatus most suitable for producing a prepreg having a uniform resin content on both front and back surfaces.

[0002]

2. Description of the Related Art A prepreg used for a metal-clad laminate is manufactured by using a resin impregnation apparatus as shown in FIG. From the resin varnish supply device 2 into the impregnation tank 1, the temperature,
The resin varnish 3 whose viscosity is controlled is supplied, and the base material 6 such as glass cloth is fed into the impregnation tank 1 from the direction A in the figure.

A substrate 6 such as a glass cloth sent into the impregnation tank 1 is conveyed in the B direction by the in-tank roll 4 while being immersed in the resin varnish 3 in the impregnation tank 1, and is moved from the impregnation tank 1 in the B direction. Excessively adhered resin varnish is cut off by the coating amount control device 5 to remove the base material 6 that has been sent out, and in the next step, it is dried to a semi-cured state to be a prepreg.

In general, the temperature and viscosity of the resin varnish have a great influence on the resin content of the prepreg, so the resin varnish 3 supplied from the supply device 2 is supplied while being controlled to a predetermined temperature and viscosity. Liquid level control and temperature control by the overflow method are also performed in the impregnation tank 1, and the resin varnish 3 is circulated so that the viscosity of the resin varnish 3 in the impregnation tank 1 becomes uniform.

[0005]

By the way, the resin varnish 3 cut off by the coating amount control device 5 is used as the impregnation tank 1.
When the resin varnish 3 flows down, the solvent component contained in the resin varnish 3 is volatilized, so that the resin varnish has a higher viscosity than the resin varnish 3 supplied into the impregnation tank 1.

In such a resin impregnation apparatus, since the resin varnish 3 supplied to the impregnation tank 1 is supplied from the liquid supply port 7 of the supply device 2 provided on the lower surface side of the impregnation tank 1, the impregnation tank 1 A portion where the resin varnish 3 is difficult to circulate, that is, a portion where the resin varnish 3 easily stagnates occurs in a part of the inside.

For example, as shown by hatching in FIG. 2, the portion 7 surrounded by the base material 6 on the side in contact with the in-tank roll 4 (in-tank roll contact side) has the base material 6 itself as a baffle plate. The resin varnish 3 is difficult to circulate in the impregnation tank 1.

However, in this portion 7, since the resin varnish having a high viscosity removed from the coating amount control device 5 has a poor circulation and diffusibility, it becomes a residence site of the resin varnish having a high viscosity, but in the tank. In the part 9 on the non-contact side of the roll, the temperature,
The resin varnish 3 whose viscosity is controlled can be circulated favorably, and the resin varnish state of the target viscosity can be maintained.

As described above, when the viscosity of the resin varnish to be impregnated is different between the front and back surfaces of the substrate 6 in the impregnation tank 1, that is, the in-tank roll contact side and the in-tank roll non-contact side, the resin content on both front and back surfaces is If different prepregs are used and a laminated plate is used, warpage may occur. Such a phenomenon has a great influence particularly when a varnish containing a filler is used, and deteriorates the properties of the laminated plate.

The present invention has been made under such circumstances, and it is suitable for stabilizing the viscosity of the resin varnish in the impregnation tank and producing a prepreg having a uniform resin content on both front and back surfaces. An object of the present invention is to provide a resin impregnation device.

[0011]

In order to achieve the above object, the present invention supplies a resin varnish whose temperature and viscosity are controlled from an apparatus for supplying a resin varnish into the impregnation tank, and the substrate is placed in the impregnation tank. In a resin impregnation device that is immersed in resin varnish, the resin varnish for temperature and viscosity control is supplied to a place where the base material becomes a baffle and the resin varnish is difficult to circulate and stagnant in the impregnation tank. It is characterized in that a device is attached.

This auxiliary resin varnish supply device may be installed above the in-tank roll in the impregnation tank.

[0013]

According to the present invention, since the base material serves as a baffle plate, the resin varnish is less likely to circulate in the impregnation tank and is easily stagnated.
A resin varnish whose temperature and viscosity are controlled can be supplementarily supplied, and the high-viscosity resin varnish cut off by the coating amount control device does not stay in one place in the impregnation tank, and the resin varnish in the impregnation tank is uniform To prevent the occurrence of resin difference between the front and back surfaces of the prepreg.

[0014]

Embodiments of the present invention will now be described in detail with reference to the drawings. FIG. 1 is a schematic configuration diagram showing a resin impregnating apparatus of the present invention. The same configuration as the conventional one will be described with the same reference numerals as those in FIG.

In FIG. 1, a resin varnish 3 whose temperature and viscosity are controlled is supplied from a liquid supply port 7 of a resin varnish supply device 2 provided on the lower surface of the impregnation tank 1. A substrate 6 such as a glass cloth is fed into the impregnation tank 1 from the direction A in the figure and immersed in the resin varnish 3 while being conveyed in the direction B by the in-tank roll 4.

Substrate 6 sent out from impregnation tank 1 in direction B
Is the coating amount control device 5 for the resin varnish that has been excessively attached.
Then, it is cut off and removed, and in the next step, it is dried to a semi-cured state.

In the present invention, an auxiliary resin varnish supply device 10 is provided on the upper surface of the impregnation tank 1. This auxiliary resin varnish supply device 10 supplies the resin varnish to a portion 7 on the upper surface side of the impregnation tank 1 surrounded by the base material 6 on the side in contact with the in-tank roll 4, that is, a portion on the in-tank roll contact side. Like the device 2, the resin varnish 3 whose temperature and viscosity are controlled can be supplementarily supplied.

As described above, since the base material 6 serves as a baffle plate and the resin varnish 3 is difficult to circulate in the impregnation tank 1 and is easily stagnant, this portion 7 is dripped from the coating amount control device 5. The resin varnish having a high viscosity tends to stay, and a difference in viscosity of the resin varnish occurs between the portion 9 on the non-contact side of the in-tank roll.

However, in the present invention, since the resin varnish 3 whose temperature and viscosity are controlled is forcibly supplied from the auxiliary resin varnish supply device 10, the viscosity of the resin varnish in the impregnation tank 1 is stabilized. As a result, it is possible to prevent the occurrence of resin difference between the front and back surfaces of the prepreg.

Next, the experimental results of the resin impregnating apparatus of the present invention by the present inventors and the conventional resin impregnating apparatus will be described.

Using a filler-containing epoxy resin varnish controlled at a temperature of 30 ° C. and a viscosity of 300 cp, FIG.
A prepreg was produced by the resin impregnating apparatus of the present invention shown in FIG.

Using a resin varnish similar to the above experimental example,
As a comparative example, a prepreg was produced by the conventional resin impregnation apparatus shown in FIG.

With both devices, the viscosity change of the resin varnish in the impregnation tank 1 was measured at each elapsed time during the continuous production of the prepreg. Table 1 shows the measurement results. The unit is mPa · s.

[0024]

[Table 1]

According to the results shown in Table 1, in the resin impregnating apparatus of the present invention, the base material 6 serves as a baffle plate, and the resin varnish is less likely to circulate in the impregnation tank 1 and is likely to be stagnant (part 8 in the figure). It was found that the resin varnish 3 whose temperature and viscosity were controlled was forcibly supplied and the resin varnish circulated uniformly in the impregnation tank 1.

[0026]

As described above, according to the present invention,
Even if the high-viscosity resin varnish dropped off by the coating amount control device drips, it does not stay in one place in the impregnation tank, and the circulation of the resin varnish in the impregnation tank becomes uniform,
The viscosity of the resin varnish can be stabilized. Therefore, the difference in resin between the front and back surfaces of the prepreg can be reduced, and warpage of the laminate can be prevented.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram showing a resin impregnating apparatus of the present invention.

FIG. 2 is a schematic configuration diagram showing a conventional resin impregnation device.

[Explanation of symbols]

 1 Impregnation Tank 3 Resin Varnish 6 Base Material 10 Auxiliary Resin Varnish Supply Device

Claims (2)

[Claims] 1. A resin impregnating apparatus in which a resin varnish whose temperature and viscosity are controlled is supplied from a resin varnish supplying device to a resin varnish and the substrate is immersed in the resin varnish in the impregnating tank. A resin impregnating device, characterized in that an auxiliary resin varnish supplying device for supplying a resin varnish whose temperature and viscosity are controlled is attached to a place where the resin varnish is less likely to circulate and stagnant in the impregnation tank. 2. The resin impregnating apparatus according to claim 1, wherein the auxiliary resin varnish supplying apparatus is provided above the in-tank roll in the impregnating tank.