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Thermal gradients in the walls of polyester parisons play a major role in determining the morphology and superstructure in the walls of the stretch blow molded bottles. This is associated with both the variation in material characteristics with temperature and the greater stretch ratios on the inner surface of the bottle. The influence of thermal equilibration time following a constant preheating period on bottle appearance, void content, oxygen permeability and other bottle characteristics was studied.

Effect of equilibration time on the properties of reheat blown 2L pet bottles