Abstract
AbstractThe equations governing the shape and velocity of the polymer melt in the bubble blowing part of the blown film process are derived for non‐isothermal Newtonian and isothermal elastic material behavior. Measured bubble shapes (Ast, 1973; Farber, 1973) can be reproduced quite well, lying between elastic and viscous predictions. Velocity and strain rate predictions appear more sensitive to details of temperature profile and melt rheology. The results also include bubble pressure predictions or equivalently apparent viscosities for bubble blowing. The main lines of development suggested are the modeling of heat transfer and the use of a viscoelastic constitutive equation.
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