Stretching apparatus of a flattened cylindrical film

Details Stretching apparatus of a flattened cylindrical film Stretching apparatus of a flattened cylindrical film

1979-09-12

1981-02-17

Thurlow, Jeffery R.

Plastic article or earthenware shaping or treating: apparatus

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

Rod or tubular preform

156494, 264565, 425403, B29D 724

Patent

active

042511976

ABSTRACT:
This invention relates to a stretching apparatus of a flattened cylindrical film consisting of one or more layers of thermoplastic resin. The stretching apparatus has a heavy mandrel for heating and stretching a film. Due to suspending means suspending the heavy mandrel the cylindrical film of one or more layers is stretched smoothly without shaking, thereby a uniformly flattened, thin, strong cylindrical film is obtained.

REFERENCES:
patent: 3065097 (1962-11-01), Zupic et al.
patent: 3437537 (1969-04-01), Takada
patent: 3608019 (1971-09-01), Kawasaki et al.
patent: 3894907 (1975-07-01), Sudo

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