Blown film process

Details Blown film process Blown film process

1978-09-01

1980-05-06

Thurlow, Jeffery R.

Plastic and nonmetallic article shaping or treating: processes

With measuring, testing, or inspecting

264 402, 264 403, 264 406, 264565, 264566, 425 72R, 425140, 4253261, B29D 2304

Patent

active

042017416

ABSTRACT:
In a blown film process for manufacturing plastic film bags, the shape of the film bag being formed is dynamically controlled by sensors provided at specific locations. At these locations, any deviation of the bag shape from the ideal shape will result in significant differences in quality of the produced film bag, or may result in a break of the film bag. Such deviation in shape is prevented by using the output signals from the sensors to control various process parameters.

REFERENCES:
patent: 3307218 (1967-03-01), Reifenhauser
patent: 3355770 (1967-12-01), Augustin
patent: 3400184 (1968-09-01), Matsuo et al.
patent: 3932080 (1976-01-01), Uemura et al.
patent: 4101614 (1978-07-01), Havens
patent: 4140460 (1979-02-01), Carlsen

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