Automatic control of bubble size in blown film

Details Automatic control of bubble size in blown film Automatic control of bubble size in blown film

1981-05-04

1982-10-26

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, 264564, 425 72R, 425172, 4253261, B29D 2304

Patent

active

043559662

ABSTRACT:
A system of automatically controlling the size of thermoplastic blown film to minimize scrap generation by guiding the bubble at an elevation above the melting point of the bubble, to keep it centered above the extrusion die, sensing when the bubble is too wide or too narrow and automatically actuating a means to selectively remove or deliver gas or air to or from the bubble to return the bubble to the predetermined desired diameter of width and sensing when the predetermined diameter or width is obtained.

REFERENCES:
patent: 3499064 (1970-03-01), Tsuboshima et al.
patent: 3522630 (1970-08-01), Swickard, Jr.
patent: 3596321 (1971-08-01), Upmeier
patent: 3886243 (1975-05-01), Uemura et al.
patent: 3980418 (1976-09-01), Schott, Jr.
patent: 4189288 (1980-02-01), Halter
patent: 4201741 (1980-05-01), Pannenbecker
patent: 4243363 (1981-01-01), Mulcahy
patent: 4246212 (1981-01-01), Upmeier et al.

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