Method of controlling the film thickness at a blown film install

Details Method of controlling the film thickness at a blown film install Method of controlling the film thickness at a blown film install

1980-12-09

1982-07-13

Thurlow, Jeffery R.

Plastic and nonmetallic article shaping or treating: processes

With measuring, testing, or inspecting

264 406, 264 407, 264564, 425141, 425143, 425144, 4253261, 425381, B29D 2304

Patent

active

043394043

ABSTRACT:
A nozzle ring of an extruder for blowing tubular plastics film is divided into cooling sectors provided with adjusting elements. The thicknesses of the blown film are measured over the circumference thereof and a number of film sectors of equal circumferential length corresponding to the number of cooling sectors is established from the measured thicknesses. Assuming that the film sector of maximum or minimum thickness has been extruded in the correct position for the purpose of determining the cooling sector associated with the film sector, the subsequent film sectors are in turn allocated to successive cooling sectors. From the measurements, the mean thickness distributions are determined over the individual film sectors. These values of mean thickness distribution define a measure for the correcting command for the adjusting elements of the cooling sectors that are associated with the respective film sectors.

REFERENCES:
patent: 3307215 (1967-03-01), Gerhard et al.
patent: 3510374 (1970-05-01), Walker
patent: 3768949 (1973-10-01), Upmeier
patent: 3775035 (1973-11-01), Scotto et al.
patent: 3974248 (1976-08-01), Atkinson
patent: 4189288 (1980-02-01), Halter
patent: 4209475 (1980-06-01), Herrington et al.
patent: 4246212 (1981-01-01), Upmeier et al.
Article entitled "Prozessregler in der Extrusionstechnik", published 1976.
Article entitled "Moglickkeiten der Prozessbrechneranwendung bel Flachfolien-und Tafelextrusionsanlagen," published 1978.

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