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Theoretical model sheds light on film blowing

from SPE Plastics Research Online

The film blowing process is well-known and important for industrial biaxially-stretched polymeric film production. Here, the polymer melt is continuously vertically extruded through an annular die at a constant flow rate, forming a thin-tubular film of varying radius and thickness. A stretching force applied by nip rolls causes an axial extension of the film, flattening it into a double-layer sheet and sealing the bubble from above the film. more


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