Method and apparatus for controlling blown film thickness

Details Method and apparatus for controlling blown film thickness Method and apparatus for controlling blown film thickness

1991-09-25

1993-04-13

Tentoni, Leo B.

Plastic and nonmetallic article shaping or treating: processes

With measuring, testing, or inspecting

264 407, 2642092, 26421112, 264564, 425141, 425162, 4253261, 425377, B29C 4978, B29C 5528

Patent

active

052020681

ABSTRACT:
A process and apparatus for controlling the thickness of film made in a blown film machine having a rotating die, wherein a variable speed motor is used to control the haul-off speed of the film from the machine, by subdividing the die rotation into angular segments, measuring the blown film thickness at a point fixed in space and across each of the angular segments, and calculating an average film thickness for an angular segment, and comparing the measured thickness against a preselected desired thickness, and increasing or decreasing the speed of the variable speed motor to change the haul-off speed to bring the measured thickness into agreement with the preselected thickness.

REFERENCES:
patent: 3286302 (1966-11-01), Doering
patent: 4246212 (1981-01-01), Upmeier et al.
patent: 4339403 (1982-07-01), Upmeier et al.

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