Method for controlling the thickness of a film product

Details Method for controlling the thickness of a film product Method for controlling the thickness of a film product

1981-02-25

1983-10-11

Woo, Jay H.

Plastic and nonmetallic article shaping or treating: processes

With measuring, testing, or inspecting

2642902, 425141, G05D 503, B29F 300

Patent

active

044091605

ABSTRACT:
A method for controlling the thickness of an extruded, biaxially elongated film product, in which thickness deviations are controlled automatically and without supervision.
In the method, correlation between positions along the widthwise direction of a film sheet and positions of die manipulation bolts of an extrusion die is obtained, and initially, a profile of the film sheet prior to lateral elongation is converged into a tolerable range; thereafter, the thickness of the film sheet after lateral elongation is measured, and if there are thickness deviations outside the tolerable range, a thickness regulation is effected by transmitting a signal corresponding to the thickness deviations to the appropriate die manipulation bolts.

REFERENCES:
patent: 3122783 (1964-03-01), Jolliffe et al.
patent: 3122784 (1964-03-01), Jolliffe et al.
patent: 3212127 (1965-10-01), Flook et al.
patent: 3347960 (1967-10-01), Tenley
patent: 3694726 (1972-03-01), Knowles
patent: 3782873 (1974-01-01), Lynnknowles
patent: 4124342 (1978-11-01), Akatsuka et al.

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