Method of controlling the film thickness at a blown film...

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

B - Operations, Transporting

29

C

18/522

B29C 47/92 (2006.01)

Patent

CA 1163066

ABSTRACT OF THE DISCLOSURE 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 said film sector, the subse- quent 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.

368211

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