Package making – Closing packages and filled receptacles – By means adapted to engage outturned seam of package cover
Patent
1975-11-03
1977-07-26
Spruill, Robert Louis
Package making
Closing packages and filled receptacles
By means adapted to engage outturned seam of package cover
53388, 93 441R, 156497, B65B 716
Patent
active
040373703
ABSTRACT:
An apparatus for sealing liquid-tight a liquid filled carton, having at its open end a cover attached to the body of the carton so as to be pressed down upon and adhesively secured to sealing flaps attached to the body of the carton at its open end, has a conveyor for bringing filled cartons into registry with carton sealing assemblies each of which includes a pair of pivotally mounted arms for firmly clasping the carton in substantially complete contacting encompassment over a portion of its length immediately below the open top, and also includes a pivotally mounted plate for pushing the cover down into contact with the sealing flaps. The paperboard of which the carton is formed is preferably coated with polyethylene, and after the carton has been firmly clasped it is transported by the conveyor past a heat source which melts the polyethylene on the areas that are to be sealed together. Immediately after the heating of the polyethylene the pivotally mounted plate clamps down upon the carton cover pressing it firmly into engagement with the sealing flaps. The carton is next transported through a cooling duct, the cover remaining clamped down by the pivoted plate. When the carton emerges from the cooling duct the pivoted plate is raised, the clasping arms are retracted and the filled and sealed carton is discharged from the conveyor.
REFERENCES:
patent: 2391708 (1945-12-01), Johnson et al.
patent: 2425062 (1947-08-01), Johnson
patent: 2654981 (1953-10-01), Stenger
patent: 3137112 (1964-06-01), Kulleseid
patent: 3823306 (1974-07-01), Davis
Nolex Corporation
Spruill Robert Louis
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