Apparatus for controlling thickness of film formed by melt extru

Details Apparatus for controlling thickness of film formed by melt extru Apparatus for controlling thickness of film formed by melt extru

1990-03-29

1992-05-26

Woo, Jay H.

Plastic article or earthenware shaping or treating: apparatus

Control means responsive to or actuated by means sensing or...

Control means responsive to product weight or dimension

264 402, 425143, 425466, B29C 4722

Patent

active

051162113

ABSTRACT:
An apparatus for controlling the thickness of a film molded by a melt extruding method provided with a plurality of cooling means for cooling the vicinity of a die lip close to a plurality of heating means and with many grooved holes in which the heating means are embedded and provided with air holes at the both ends thereof, whereby the temperature can be freely adjusted to the high and low set values in a short period of time, by which the time loss and material loss can be reduced.

REFERENCES:
patent: 3940221 (1976-02-01), Nissel
patent: 4425290 (1984-01-01), Upmeier
patent: 4514348 (1985-04-01), Iguchi et al.
patent: 4726752 (1988-02-01), Van Dun
patent: 4753587 (1988-06-01), Djordjevic et al.
patent: 4781562 (1988-11-01), Sano et al.
patent: 4882104 (1989-11-01), Dobrowsky
patent: 4886438 (1989-12-01), Borger et al.
Kirk-Othmer Concise Encyclopedia of Chemical Technology, New York: John Wiley & Sons, Inc. 1985, pp. 236-240, 1159-1161.

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