Method and apparatus for optimizing the output of a blown film e

Details Method and apparatus for optimizing the output of a blown film e Method and apparatus for optimizing the output of a blown film e

1979-04-13

1981-01-20

Thurlow, Jeffery R.

Plastic and nonmetallic article shaping or treating: processes

With measuring, testing, or inspecting

264 406, 264 407, 264564, 264569, 425 72R, 425140, 425141, 425143, 4253261, B29D 2304

Patent

active

042462126

ABSTRACT:
In a film blowing plant comprising an extruder for the melt, a film blowhead, calibrating means for the blown tubular film, oscillatory take-off means for the film and a coiler for the flattened film, the output of the plant is set to an optimum figure by a process computer controlling the width and thickness of the film. The height of the line of solidification of the film above the blowhead is measured and, in response to a departure of this height from a given desired value, the output of the extruder is increased or reduced as the case may be.

REFERENCES:
patent: 3231651 (1966-01-01), Cheney
patent: 3286302 (1966-11-01), Doering
patent: 3576935 (1971-04-01), Dyer et al.
patent: 3775035 (1973-11-01), Scotto et al.
patent: 4101614 (1978-07-01), Havens

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