Stretching device for stretching tubular film

Details Stretching device for stretching tubular film Stretching device for stretching tubular film

1987-05-15

1988-07-26

Chiesa, Richard L.

Plastic article or earthenware shaping or treating: apparatus

Continuous filament forming or film casting means with...

2642095, 264291, 264566, 264567, 425325, 425397, B29C 5528

Patent

active

047597020

ABSTRACT:
A stretching device for stretching a tubular film includes a mandrel including a stretching section, a pair of payoff nip rolls disposed upstream of the mandrel and a pair of take-up nip rolls disposed downstream of the mandrel. The stretching section of the mandrel is comprised of a plurality of rings arranged substantially concentrically in spaced-apart relationship in the travelling direction of the tubular film. The outside diameter of a ring on the downstream side is larger than that of a ring on the upstream side. Each of the rings has a plurality of rotating members mounted rotatably, and the plurality of rotating members define an outer circumferential ring edge which is generally smoothly circular.

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patent: 3904342 (1975-09-01), Sato et al.
patent: 4165356 (1979-08-01), Heider

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