Pressure roll, and molding apparatus using the pressure roll

Details Pressure roll, and molding apparatus using the pressure roll Pressure roll, and molding apparatus using the pressure roll

1995-12-14

1999-09-14

Mackey, James P.

Plastic article or earthenware shaping or treating: apparatus

Press forming means, press reshaping means, or vulcanizing...

425368, 425DIG235, 492 5, 492 49, B29C 4346

Patent

active

059520175

ABSTRACT:
The present invention is directed to a pressure roll including a cylindrical core member having a center shaft, an intermediate layer surrounding the core member and formed from a flexible material, and an outermost layer surrounding the intermediate layer and formed from a high-thermal conductivity material having a thermal conductivity of not less than 0.03 cal/cm.multidot.sec.multidot..degree.C. Also disclosed is a molding apparatus for a plastic sheet using the pressure roll. According to the pressure roll and the molding apparatus using the pressure roll, when a resin extruded sheet interposed between the pressure roll and a main cooling roll is pressed onto the main cooling roll, the outermost layer of the pressure roll is elastically deformed slightly to apply a surface pressure onto the resin extruded sheet, while cooling the plastic sheet. Accordingly, even if the pressure applied to the plastic sheet is increased, the plastic sheet is not broken and the plastic sheet can be efficiently cooled due to the wide cooling area. Moreover, an extremely thin extruded sheet having an excellent surface condition can be prepared.

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