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Stretched film of ethylene random copolypropylene (r-PP) is widely used for heat shrinkable film. The content of copolymerized ethylene is selected in accordance with use. In this paper, the influence of annealing conditions on dimensional stability and heat shrinkage was reported for the stretched film of r-PP produced by double bubble tubular machine.From this research, the prediction formula was derived by multiple linear regression analysis, and as a result the setting guideline of annealing conditions was proposed in order to design a heat shrinkable film of r-PP with good dimensional stability and the required heat shrinkage

Influence of Annealing Conditions on Shrinkage behaviors of Double Bubble Tubular Film of Ethylene Random Copolypropylene