Method of producing a thermoplastic film

Details Method of producing a thermoplastic film Method of producing a thermoplastic film

2011-08-09

2011-08-09

Vargot, Mathieu D. (Department: 1742)

Plastic and nonmetallic article shaping or treating: processes

Forming continuous or indefinite length work

By casting liquids on a solid supporting or shaping surface

C264S001340, C264S211120, C264S217000, C264S288400, C264S290200

Reexamination Certificate

active

07993562

ABSTRACT:
A method for producing a thermoplastic film, comprising cooling and solidifying a filmy thermoplastic melt resin, by holding it between a metallic presser and a metallic casting roll for cooling; wherein the temperature of the filmy thermoplastic resin just before being held between the metallic presser and the casting roll for cooling is from Tg+20° C. to Tg+90° C. and a difference between a surface temperature (Tt) of the metallic presser and a surface temperature (T1) of the casting roll for cooling satisfies the formula (1) and a contact length Q satisfies the following formula (2)in-line-formulae description="In-line Formulae" end="lead"?0.5° C.≦T1−Tt≦20° C.  (1)in-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?0.1 cm≦Q≦8 cm  (2)in-line-formulae description="In-line Formulae" end="tail"?The method provides a thermoplastic film having high thickness accuracy and surface smoothness.

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A. N. Baczynski et al.,Physics Handbook,Jan. 1957, p. 60, Commercial Press, Ltd., and English language translation of excerpt.
Chinese Official Action dated Apr. 27, 2011, issued in corresponding Chinese Application No. 200710109944.2, and English language translation thereof.

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