COMPARISON OF WATER-QUENCH VERSUS AIR-QUENCH BLOWN FILM PROCESSES - PART II: THERMOFORMABILITY

摘要

This paper investigates the film property differences between water-quench versus the traditional air-quench blown film samples. In Part I, it was found that the overall crystallinity of the water-quench film was much lower than that of the air-quench film. This resulted in higher WVTR and OTR values. The effect of process parameters such as water ring position, water temperature and annealing temperatures on the final film properties were found to be insignificant. In the second part of this study, thermoformability of the samples will be investigated in detail. Thermoforming trials were performed on both a batch former and an automated Multivac thermoformer.