Air ring for controlling blown film thickness

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

1991-03-25

1994-02-22

Silbaugh, Jan H.

Plastic article or earthenware shaping or treating: apparatus

Shaping orifice and downstream work contacting gaseous...

425141, 425143, 4253261, B29C 4788, B29C 4792

Patent

active

052882195

ABSTRACT:
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 includes controlling 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.

REFERENCES:
patent: 3217359 (1965-11-01), Euling
patent: 3235632 (1966-02-01), Lemmer et al.
patent: 3835209 (1974-09-01), Karabedian
patent: 3976732 (1976-08-01), Herrington
patent: 4145177 (1979-03-01), Schott, Jr.
patent: 4209475 (1980-06-01), Herrington
patent: 4246212 (1920-01-01), Upmeier et al.
patent: 4339403 (1982-07-01), Upmeier et al.
patent: 4339404 (1982-07-01), Upmeier et al.
patent: 4351785 (1982-09-01), Upmeier et al.
patent: 4425290 (1984-01-01), Upmeier
patent: 4464318 (1984-08-01), Upmeier et al.
patent: 4750874 (1988-06-01), Keim
patent: 4834924 (1989-05-01), D'Annunzio et al.

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