Package end fold sealer and method

Details Package end fold sealer and method Package end fold sealer and method

1990-03-14

1991-10-22

Sipos, John

Package making

Closing packages and filled receptacles

Including provision for pleat of cover overhang

533714, 533873, B65B 5120, B65B 5132

Patent

active

050583611

ABSTRACT:
An apparatus for sealing the folded end flaps of a plastic film package is disclosed. The apparatus has means for transporting the package along a path and linear spaced end fold guides which are spaced from the path so as to retain the end flaps of the package folded against the package while traveling along the path from an overwrapping machine. Air heating and blowing means disperse heated air towards the folded end flaps of an article traveling along the path. Rotatable air-heated spot-weld rollers having a plurality of spaced protrusions are flexibly mounted adjacent to the path. The rollers are rotatably mounted and are adapted to be pressed against the end flaps of the package so the heated protrusions spot-weld the end flaps to one another. A hot air dispersing nozzle directs the heated air from the air heating and blowing means onto the spot-welded end flaps of the package causing portions of the end flaps to become molten. Cylindrical compression rollers which are formed with a series of uniform holes are maintained in spring-mounted relation to the path so as to press against and cool the semi-molten end folds of the package traveling along the path to bring about the sealing of the end flaps to one another.

REFERENCES:
patent: 1114744 (1914-10-01), Friend
patent: 1655639 (1928-01-01), Sevigne
patent: 1685196 (1928-09-01), Bechman
patent: 2354989 (1944-08-01), Fusco
patent: 3057125 (1962-10-01), Jensen
patent: 3063215 (1962-11-01), Parks
patent: 3243334 (1966-03-01), Lake
patent: 3264799 (1966-08-01), Bartlo
patent: 3618477 (1971-11-01), Piazze
patent: 3977306 (1976-08-01), Flynn

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