Film extrusion die

Details Film extrusion die Film extrusion die

1989-10-05

1990-12-18

Chiesa, Richard L.

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

425381, 425466, B29C 4716, B29C 4792

Patent

active

049782894

ABSTRACT:
A T-shaped film extrusion die having a T-shaped die main body, a device for detecting the thickness of a resin film formed by extrusion to generate a detection signal, a device for generating a correction signal on the basis of a difference between the detection signal and preset thickness data, and a lip-width adjusting device for driving lip-width adjusting bolts on the basis of the correction signal to adjust the width between lips of the die so that the resin film has a preset thickness.

REFERENCES:
patent: 3940221 (1976-02-01), Nissel
patent: 4125350 (1978-11-01), Brown
patent: 4734922 (1988-03-01), Harris
patent: 4741686 (1988-05-01), Cazzani et al.
patent: 4781562 (1988-11-01), Sano et al.
patent: 4863361 (1989-09-01), Boos

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