Method for heat sealing round containers

Details Method for heat sealing round containers Method for heat sealing round containers

1979-12-28

1981-12-15

Dawson, Robert A.

Adhesive bonding and miscellaneous chemical manufacture

Methods

Surface bonding and/or assembly therefor

53458, 156 69, 1563096, 229 45, 229 55, 229 24, 229 37E, 428 35, 428121, 493133, 493140, 493152, B31F 100, B32B 108

Patent

active

043057713

ABSTRACT:
A multi-piece, tub shaped paperboard container having a circular opening in the top thereof is provided with a multi-piece, reinforced rim coated with a layer of meltable plastic and is assembled by applying heat to overlapping seams in order to melt the plastic coating and thereby seal the seams. Heat is applied evenly around the entire periphery of the rim by a 2-piece, annularly shaped, heated collar which may be selectively shifted into conforming engagement with the container. The even application of heat around the entire periphery of the rim equalizes the surface tension of the plastic coating during melting thereof to avoid deformation of the rim during the heat sealing process.

REFERENCES:
patent: 2367749 (1945-01-01), Barbieri
patent: 3336847 (1967-08-01), Durat

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