Apparatus for stretching a tubularly-formed sheet of thermoplast

Details Apparatus for stretching a tubularly-formed sheet of thermoplast Apparatus for stretching a tubularly-formed sheet of thermoplast

1977-02-09

1979-03-13

Spicer, Jr., Robert L.

Plastic article or earthenware shaping or treating: apparatus

Continuous filament forming or film casting means with...

425325, 425328, 425363, 425404, 425DIG201, 264290R, B29D 724

Patent

active

041440080

ABSTRACT:
There is described in a preferred embodiment of the present invention, a process and apparatus for bi-axially stretching a tubularly-formed sheet of thermoplastic material in a first station and a plurality of second stations wherein the first and second stations are provided with sets of rolls having generally sinosoidally-shaped grooves perpendicular and parallel, respectively, to the axis of each set of rolls to produce bags of improved strip tensile breaking length.

REFERENCES:
patent: 2773285 (1956-12-01), Piazz et al.
patent: 2816837 (1957-12-01), Holsman
patent: 3172150 (1965-03-01), Dornier
patent: 3383449 (1968-05-01), Muller
patent: 3884748 (1975-05-01), Andersen et al.

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