Method for initiating biaxial stretching of plastic tubes and ap

Plastic and nonmetallic article shaping or treating: processes – Direct application of fluid pressure differential to... – Production of continuous or running length

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4253261, 4253871, B29D 724

Patent

active

042909961

ABSTRACT:
A method for rendering initiation of stretching easier in the production of biaxial stretched film of plastic tube carried out by enclosing gas in said tube and by the difference in the peripheral velocity between delivery nip rolls and take-up nip rolls is provided. This method is characterized by passing said tube between at last one pair of nipping means for enclosing gas, having therebetween a clearance adjustable in the range of 1.about.10 mm. The nipping means are provided before or behind said take-up nip rolls and driven at a peripheral speed same as that of said take-up nip rolls.

REFERENCES:
patent: 2744336 (1956-05-01), Milne
patent: 3608019 (1971-09-01), Sato et al.
patent: 3853448 (1974-12-01), Yazawa
patent: 3960997 (1976-06-01), Sorensen

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