JP2935302B2 - Manufacturing method of prepreg - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a prepreg for producing a laminate.

[0002]

2. Description of the Related Art A prepreg for manufacturing a laminate is manufactured by impregnating a long base material such as a glass woven fabric, a glass nonwoven fabric, and paper with a resin varnish such as an epoxy resin and passing through a drying furnace. At the outlet of the drying oven, the prepreg is taken through the gap between the cooled rolls, and is transferred to the next step.

[0003]

As described above, it is not sufficient to cool the prepreg simply by passing it through a roll. If the transfer direction is changed in such a state, the manufactured prepreg will bend.

[0004] The problem to be solved by the present invention is to prevent the prepreg from being bent even when the prepreg taken from the drying furnace is transferred in a different direction.

[0005]

In order to solve the above-mentioned problems, a manufacturing method according to the present invention is characterized in that a prepreg is transported at the outlet of a drying furnace in contact with a cooled endless belt.

[0006]

In the manufacturing method according to the present invention, the prepreg is brought into contact with the cooled endless belt at the outlet of the drying furnace, so that the cooling time is prolonged and sufficient cooling can be achieved.

[0007]

An embodiment according to the present invention will be described. The endless belt 2 made of steel is installed at the outlet of the drying furnace 4. Steel belt 2 has a distance between shafts of 1500 mm and a diameter of 25 mm.
It is driven by a pair of 0 mm rolls 3, 3 '. The rolls 3 and 3 'are maintained at 20 ° C. by flowing water therein. Thereby, the endless belt 2
It is always cooled by rolls 3, 3 '. The prepreg 1 coming out of the drying furnace 4 is first transferred and cooled while being in contact with the endless belt 2. After that, the transfer direction is changed to 120
° and changed to about 1050 mm, cut into 1050 × 1050 mm, and stacked at a height of 400 mm.

For comparison, the prepreg coming out of the drying oven was taken out through a gap between rolls maintained at 20 ° C., and thereafter, the prepreg was taken out by changing the transfer direction and stacked in the same manner as described above.

[0009] The prepreg stacked at a height of 400 mm is slightly thicker at the side due to curling, but the thickness of the prepreg of the embodiment is 20 mm thicker than that of the center portion, but is 50 mm thicker in comparison. . This shows that the method according to the present invention suppresses the bending of the prepreg.

[0010]

As described above, in the method according to the present invention, the prepreg coming out of the drying furnace is sufficiently cooled.
Even if the transfer direction is changed, it is possible to prevent the prepreg from being bent.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing one embodiment according to the present invention.

[Explanation of symbols]

 1 is a prepreg 2 is an endless belt 3 is a roll 4 is a drying oven

Claims (1)

(57) [Claims] In the step of passing a long sheet-like base material impregnated with a resin varnish into a prepreg by passing it through a drying furnace, transferring the prepreg into contact with a cooled endless belt installed at an outlet of the drying furnace. Characteristic prepreg manufacturing method.