B - Operations – Transporting – 31 – B
Patent
B - Operations, Transporting
31
B
93/22
B31B 1/64 (2006.01) B29C 65/00 (2006.01) B29C 65/18 (2006.01) B31B 23/00 (2006.01) B29C 65/74 (2006.01)
Patent
CA 1295162
METHOD AND APPARATUS FOR CONTINUOUS PRODUCTION OF BAGS FROM THERMOPLASTIC FILM ABSTRACT OF THE DISCLOSURE 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.
577056
First Brands Corporation
Riches Mckenzie & Herbert Llp
LandOfFree
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