B - Operations – Transporting – 32 – B
Patent
B - Operations, Transporting
32
B
154/138, 18/783
B32B 27/08 (2006.01) B29C 65/10 (2006.01) B32B 27/00 (2006.01) B65D 5/56 (2006.01)
Patent
CA 1099878
CANADA FDN-152 ABSTRACT OF THE DISCLOSURE The invention provides a dynamic system for heat-sealing an all-plastic material in a continuous process at high speed. The invention includes an all-plastic heat-sealable container material comprising a multiple-layer composite, in sheet form, including a core layer and at least one outer layer on one side thereof. The layers preferably comprise thermoplastic material, the core layer material having a higher softening point than the outer layer material. The composite sheet is conveyed through a converting, side-seaming or other apparatus at high speed, the system being tuned to dynamically heat the outer layers to a molten state for heat sealing, while the core does not soften but remains undistorted. The core is thus thermally insensitive to heat at speeds used in side-seaming the composite, and as such it supports and maintains the structure of the sealing outer layers on its exterior while they are in a molten condition.
281827
Ihde Richard C.
Roth Clarence E.
Thompson Kenneth P.
Champion International Corporation
Goudreau Gage & Associates
Gulf Oil Corporation
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