Process for producing thermoplastic resin films having reduced t

Details Process for producing thermoplastic resin films having reduced t Process for producing thermoplastic resin films having reduced t

1976-03-29

1978-12-12

Woo, Jay H.

Plastic and nonmetallic article shaping or treating: processes

Carbonizing to form article

Agglomeration or accretion

264216, B29F 308

Patent

active

041296303

ABSTRACT:
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 electrostaticity applying electrode, and then pinning it to the surface of a cooling drum, wherein a shielding object is disposed between the extrusion surface of the die and the electrostaticity applying 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, and an apparatus for producing a film of reduced thickness unevenness comprising an extrusion die equipped with means for adjusting the thickness unevenness of the film by temperature control, an electrode for applying electrostaticity, a cooling drum and a shielding object, said shielding object being a conductive object, a non-conductive object or a combination of these, and being disposed between the extrusion surface of the die and the electrostaticity applying electrode.

REFERENCES:
patent: 3655307 (1972-04-01), Hawkins
patent: 3660549 (1972-05-01), Hawkins
patent: 3686374 (1972-08-01), Hawkins
patent: 3758251 (1973-09-01), Gillyns et al.
patent: 3779682 (1973-12-01), Huskey et al.
patent: 3795474 (1974-03-01), Heyer
patent: 3820929 (1974-06-01), Busby et al.
patent: 3883279 (1975-05-01), Heyer
patent: 3904725 (1975-09-01), Huskey et al.

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