Blown tube collapse frame assembly

Details Blown tube collapse frame assembly Blown tube collapse frame assembly

1976-03-12

1978-01-17

Spicer, Jr., Robert L.

Plastic article or earthenware shaping or treating: apparatus

Preform reshaping or resizing means: or vulcanizing means...

Rod or tubular preform

264 95, 4253261, 4253871, B29C 1500

Patent

active

040689999

ABSTRACT:
In a blown tube process of producing thermoplastic film or sheeting, the blown tube is collapsed by passing it through a trapezoidal frame assembly to change the circular cross section of the tube to a square cross section. The square cross section tube passing from the trapezoidal frame assembly is then passed through a predeterminedly controlled flattening transition section to a pair of nip rolls in a manner that the film arrives at the nip rolls with minimal stretching.

REFERENCES:
patent: 3335208 (1967-08-01), Harris
patent: 3355770 (1967-12-01), Augustin
patent: 3930781 (1976-01-01), Upmeier

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