Manufacturing container or tube from paper; or other manufacturi – Container making – Pliable container
Patent
1987-10-01
1989-09-19
Olszewski, Robert P.
Manufacturing container or tube from paper; or other manufacturi
Container making
Pliable container
493194, 493203, 493205, 493208, 156515, B31B 164
Patent
active
048677353
ABSTRACT:
A method and apparatus are provided for continuous fabrication of bags from a longitudinally advanced multi-layer thermoplastic film web fed tangentially onto a rotating drum for carrying out transverse web seam welding and severing, the principal novel feature being provision of preliminary heating carried out across at least part of the width of web at which the final seam and sever is to take place. The preliminary heating step is advantageous where the thickness of film layers to be sealed and severed is not uniform across the width of the web or in which the uniform thickness of the film layers is such that seaming and severing in a single step requires an undesirably long time for continuous high speed production. The method can be adapted for production of bags of different widths.
REFERENCES:
patent: 3725180 (1973-04-01), Membrino
patent: 4016806 (1977-04-01), Schuster
patent: 4023470 (1977-05-01), Van der Meulen
patent: 4331502 (1982-05-01), Achelpohl et al.
patent: 4664649 (1987-05-01), Johnson et al.
First Brands Corporation
Olszewski Robert P.
Showalter Robert
Wamer Gary L.
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