Manufacturing container or tube from paper; or other manufacturi – Container making – Pliable container
Patent
1986-11-10
1987-10-27
Schmidt, Fredrick R.
Manufacturing container or tube from paper; or other manufacturi
Container making
Pliable container
493 29, 493926, 226114, 226115, 242 753, B31B 110, B31B 1918, B31B 1986, B65H 2316
Patent
active
047027312
ABSTRACT:
Disclosed is a mechanism, associated with a thermoplastic bag making machine, for preparing a strip of thermoplastic to produce bags having the upper edges of the bag mouth formed in a sinusodial shape such that the peak of such shape is substantially equi-distant relative to the side edges of the bag. While the disclosed bag machine is of the type that advances the web strip incrementally, shaping of the web strip in the sinusodial shape occurs while a portion of the web strip is advanced at substantially constant velocity. A mechanism is provided for maintaining constant tension in the web despite the constant and intermittent feeding of the web.
REFERENCES:
patent: 3608804 (1971-09-01), Swansen
patent: 3663338 (1972-05-01), Wech
patent: 3722376 (1973-03-01), Wech
patent: 4114791 (1978-09-01), Schneider
patent: 4216705 (1980-08-01), Achelpohl et al.
patent: 4368051 (1983-01-01), Lehmacher
patent: 4398903 (1983-08-01), Lehmacher
Lambrecht Emiel Y.
Van Der Gucht William
FMC Corporation
Megley R. B.
Parks R. E.
Rudy D. W.
Schmidt Fredrick R.
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