B - Operations – Transporting – 29 – C
Patent
B - Operations, Transporting
29
C
B29C 55/28 (2006.01) B29C 47/88 (2006.01) B29C 47/92 (2006.01) B29C 49/42 (2006.01) B29C 49/78 (2006.01)
Patent
CA 2317892
A method of and a device for controlling and automatically controlling the thickness profile in the production of blown film by means of blown film extruders having a blow head, a main cooling ring and an additional cooling ring arranged outside the main cooling ring and provided for supplying separate additional air streams, wherein, by means of a measuring and controlling device, the film thickness at the blown film is scanned above a freezing zone in different circumferential regions, wherein the additional air streams are controlled as a function of the measured film thickness, and wherein the additional air streams are supplied in the direction of production in front of the main cooling ring.
Kdesign Gmbh
Ridout & Maybee Llp
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