Abstract
The manufacturing technology for blown plastics film has developed considerably in recent years. Advances have been made in die construction (often with computer aided design), in film cooling methods through internal bubble cooling and dual-lip air-rings, and in process control using microprocessor aided automatic systems. The improvements in machinery have increased film output rate, improved quality and reduced scrap while maintaining the inherent flexibility of the process. Additionally, its scientific principles have been studied, producing a greater knowledge of the rheology of film formation and the effects of processing conditions on film properties. The major tonnage of blown film remains in polyethylene, both high and low density, recently augmented by linear low density. Other blown film materials include PVC, EVA, ionomers and nylons. By blending or using co-extrusion, combinations of materials can confer advantageous properties to the resulting film.
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