Control of blown film tube diameter

Details Control of blown film tube diameter Control of blown film tube diameter

1977-09-01

1979-02-20

Lake, Roy

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

264 403, 264210R, 425 72R, 425149, 4253261, 4253871, 425392, 425467, B29D 2304

Patent

active

041404602

ABSTRACT:
Control apparatus for automatically maintaining the desired blown tube diameter in the blown plastic film process where the blown tube is internally cooled by a gas flow into and out of the interior of the tube. A by-pass duct having a by-pass damper is provided on either the inlet or exhaust duct by-passing the inlet or exhaust duct damper respectively and this by-pass damper is controlled by tube diameter sensors. By thus controlling only a small percentage of the inlet or exhaust flow a very fine and stable control is achieved. Control apparatus is also provided to maintain the by-pass damper in its optimum operating range.

REFERENCES:
patent: 3932080 (1976-01-01), Uemura et al.
patent: 4069292 (1978-01-01), Herrington et al.

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