Product and process for stretching a tubularly formed sheet of o

Details Product and process for stretching a tubularly formed sheet of o Product and process for stretching a tubularly formed sheet of o

1978-05-01

1981-02-17

Lowe, James B.

Stock material or miscellaneous articles

Structurally defined web or sheet

Longitudinal or transverse tubular cavity or cell

156229, 156290, 2642093, 2642888, 264563, 428 36, 428101, B32B 108, B32B 3102, B29D 724, B29D 2304

Patent

active

042515858

ABSTRACT:
There is described a process for bi-axially stretching a tubularly-formed sheet of thermoplastic material in first and 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 strength.

REFERENCES:
patent: 2773285 (1956-12-01), Piazzi et al.
patent: 3048895 (1962-08-01), Bottomley
patent: 3257488 (1966-06-01), Rasmussen
patent: 3849526 (1974-11-01), Muller et al.
patent: 3884748 (1975-05-01), Andersen
patent: 4058582 (1977-11-01), Bierenbaum et al.
patent: 4116892 (1978-09-01), Schwarz

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