Process for producing thermoplastic resin films having more...

Details Process for producing thermoplastic resin films having more... Process for producing thermoplastic resin films having more...

B - Operations, Transporting

29

C

18/1036

B29C 47/88 (2006.01)

Patent

CA 1062426

ABSTRACT OF THE DISCLOSURE A process for producing a film of reduced thickness unevenness which comprises extruding a thermoplastic resin from an extrusion die into a film form, exposing the extrudate to an electric field induced by an electrostatically charging electrode, and then pinning it to the surface of a cooling drum, wherein a shielding object is disposed between the extrus- ion surface of the die and the electrostatically charging electrode thereby to maintain the applied voltage constant in the widthwise direction of the extrudate and to enable the extrudate to adhere intimately to the surface of the cooling drum. The invention also includes an apparatus suitable for carrying out this process.

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