Control of tubular film size

Details Control of tubular film size Control of tubular film size

1979-03-12

1981-01-06

Thurlow, Jeffery R.

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, 425 72R, 425172, 4253261, B29D 2304

Patent

active

042433630

ABSTRACT:
A blown-film system, for producing plastic tubing, in which the rate of flow of air, into or out of the tube, is made directly dependent upon the deviation in position of the tube wall and in which stability in tube size is achieved by providing a control system that feeds back both tube circumference and air valve position to drive a valve motor.

REFERENCES:
patent: 3159698 (1964-12-01), Suh et al.
patent: 3700370 (1972-10-01), Hearns et al.
patent: 3932080 (1976-01-01), Uemura et al.
patent: 3980418 (1976-09-01), Schott, Jr.

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