Control of tubular film size

Details Control of tubular film size Control of tubular film size

1981-08-24

1983-03-22

Thurlow, Jeffery R.

Plastic and nonmetallic article shaping or treating: processes

Carbonizing to form article

Agglomeration or accretion

264 401, 264 403, 264564, 425140, 425155, 4251742, 4253261, B29D 722

Patent

active

043775403

ABSTRACT:
An internally cooled blown film system, for producing a plastic tube, in which the flow rate of the continuous flow of cooling air through the tube is made directly dependent upon deviation of the tube circumference as determined by transmission and detection of ultrasonic waves from the surface of the tube.

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