JPH0732007Y2 - Dryer for prepreg production - Google Patents

Description

TECHNICAL FIELD The present invention relates to a drying device for producing a prepreg used for forming a laminated plate or the like.

2. Description of the Related Art In the production of a prepreg, a sheet-shaped base material is impregnated with a resin varnish, and the varnish is guided to a drying device to volatilize a solvent component of the varnish and cure the resin to a B stage state. The drying device blows hot air onto the sheet-shaped substrate, and the hot air is circulated in the furnace to be reheated and used repeatedly.

When hot air is circulated, the gaseous resin that volatilizes during the drying of the impregnated resin varnish is brought into the air heating heater,
It deposits on the surface as it passes through the heater. The heater with the resin deposited on the surface lowers the thermal efficiency and blocks the air passage.

Problems to be Solved by the Invention The heater that has reduced the thermal efficiency and the amount of passing air has to be taken out of the dryer to remove the adhered resin. During that time, the use of the dryer has to be stopped, which causes a decrease in the operating rate. In addition, it is difficult in work to remove and attach a heavy heater.

An object of the present invention is to provide a drying device for prepreg production, which prevents resin from adhering to a heater and can easily perform maintenance work.

Means for Solving the Problems A drying apparatus for manufacturing prepreg according to the present invention is characterized in that a honeycomb structure made of metal is installed in front of an air heating heater in a system for circulating hot air in a furnace. .

Action The air circulating in the oven of the dryer reaches the heater through the holes of the honeycomb structure and is heated. Almost all of the gaseous resin contained in the air is captured on the front surface of the honeycomb structure. A small amount of resin reaches the inside of the honeycomb structure and is deposited on the surface of the honeycomb structure, so that the resin can be prevented from depositing on the surface of the heater located behind the honeycomb structure.

Since the honeycomb structure is lightweight, it is easy to take it out of the dryer and replace it with another one if the resin deposits.
Dryer downtime is minimal. Since the gaseous resin is deposited on the front surface of the honeycomb structure, it can be easily removed with a brush, and the honeycomb structure can be repeatedly used.

Embodiment Next, an embodiment according to the present invention will be described.

The inside of the oven 1 of the dryer is separated by the partition wall 2 so that air circulates in both chambers. The sheet-shaped base material 3 in which the epoxy resin varnish is impregnated passes through one chamber. A plate fin heater 4 is arranged in the other chamber, and the air heated here blows out to both sides of the sheet-shaped base material 3. An aluminum honeycomb structure 5 is installed in front of the plate fin heater 4 based on the air circulation direction.

As shown in FIG. 2, the Haniuka structure 5 is formed by connecting hexagonal cells made of 0.04 mm thick aluminum foil. The cell size is 3 mm and the thickness is 20 mm. A 1410 × 790 mm honeycomb structure was placed at 140 ° C. in a furnace having a wind speed of 3 m / sec, and the amount of resin that could be captured by the honeycomb structure was examined. The results are shown in FIG. 3 by the change in the weight of the honeycomb structure. a is the result in the furnace with high gas concentration, and b is the result in the furnace with low gas concentration. After 2 months of use, in a, 50% of the front surface of the honeycomb structure was blocked with the captured resin, and in b, 10% of the same was blocked. The thickness of the resin attached to the front surface of the honeycomb structure is 1 to 3 mm.

Effect of the Invention As described above, the drying apparatus according to the present invention can satisfactorily capture the gaseous resin in front of the heater and prevent the resin from adhering to the heater. And since the honeycomb structure is lightweight and easy to handle, when the resin adheres and the air flow becomes poor, it is easy to replace it with another one and reduce the operation rate of the drying device. There is no. The resin adhering to the honeycomb structure can be removed with a brush, and the honeycomb structure can be repeatedly used.

Furthermore, by passing air through the honeycomb structure, the flow of the air can be adjusted before it reaches the heater, so that the entire surface of the heater can be used to heat the air and the thermal efficiency is improved.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of an essential part showing an embodiment of a drying device according to the present invention, FIG. 2 is a perspective view showing a honeycomb structure used in the drying device, and FIG. 3 is captured by the honeycomb structure. It is a graph which shows the quantity of resin. 1 is a furnace, 2 is a partition wall, 3 is a sheet-like substrate, 4 is a plate fin heater, 5 is a honeycomb structure

Claims (1)

[Scope of utility model registration request] 1. A drying device for introducing a sheet-shaped base material impregnated with a resin varnish into the inside thereof to advance the curing of the impregnated resin to form a prepreg, wherein the drying device circulates hot air in a furnace. It is a drying device for prepreg manufacturing in which a metal honeycomb structure is placed in front of an air heating heater.