Air ring and method for controlling blown film thickness

Details Air ring and method for controlling blown film thickness Air ring and method for controlling blown film thickness

B - Operations, Transporting

29

C

B29C 49/28 (2006.01) B29C 47/88 (2006.01) B29C 47/92 (2006.01) B29C 49/46 (2006.01)

Patent

CA 2061883

Apparatus and method are described for controlling thickness of plastic films produced by the blown film process. The apparatus is an air cooling ring modified to include devices for locally modifying the temperature of the air discharged from the air ring onto the blown bubble. Local variations in the temperature of the cooling air applied to the surface of the bubble result in variations in the bubble cooling rate and viscosity, with consequent variations in thinning during transverse bubble expansion. The method comprises centrally the location and extent of local temperature variation applied to the bubble in response to comparison of measured film thickness with a desired film thickness.

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