Blown Film Bubble Instability Induced by Fabrication Conditions, 1999 Polymers, Laminations & Coatings Conference Proceedings

Thomas I. Butler--Bubble instabilities in the blown film process can take several forms. Each type of instability places limits on the maximum production rate. This paper considers process variables such as melt temperature, frost line height (FLH), blow-up-ratio (BUR), and film thickness to determine the influence of bubble stability on maximum output rate. A linear low density polyethylene (LLDPE) polymer produced three types of blown film bubble instability:

(1) Periodic variations in the bubble layflat

(2) Oscillation of the FLH

(3) Molten bubble surface contacting the air ring

Methods to monitor the on-set of bubble instability included film thickness variation, internal bubble pressure variation, bubble temperature profile, and bubble edge weave to determine the maximum output rate.

Author: Butler, T.I.
Blown Film Bubble Instability Induced by Fabrication Conditi
Blown Film Bubble Instability Induced by Fabrication Conditions, 1999 Polymers, Laminations & Coatings Conference Proceedings
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