1975-05-15
1976-08-31
Coan, James F.
53375, 93DIG1, B31B 164
Patent
active
039773060
ABSTRACT:
An automatic carton sealing system in which sealing is effected by the direct application of a gaseous flame to the surfaces to be sealed. In the system, an unsealed carton formed of paperboard stock coated with a thermoplastic layer and having a flap which extends outwardly with respect to a folded-in flap to define an open shed, is conveyed past a gas burner whose flam is projected into the shed to soften the layers on the flaps, the carton then passing through compression rollers which press the flaps together as the overlapping layers cool and harden to effect a bond therebetween. Included in the system is a conveyor-failure interlock acting to shut off the fuel mixture to the burner should conveyor movement be arrested, and a flame-failure interlock acting to arrest the conveyor should the flame be extinguished.
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patent: 3610114 (1971-10-01), Kaminsky
patent: 3713952 (1973-01-01), Schafer et al.
patent: 3751876 (1973-08-01), Oakley et al.
patent: 3777448 (1973-12-01), Howe
patent: 3785255 (1974-01-01), Talbot et al.
Coan James F.
Flynn Burner Corporation
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