Rotary heat sealing method and apparatus

Details Rotary heat sealing method and apparatus Rotary heat sealing method and apparatus

1987-09-22

1989-08-08

Gallagher, John J.

Harvesters

Cornstalk type

Cutters

100 93RP, 156290, 1563084, 156312, 156359, 156361, 156383, 156553, 156582, 1565834, 493193, 493205, 493208, 493928, B32B 300

Patent

active

048549835

ABSTRACT:
An apparatus and process to permit high speed continuous motion heat sealing in the transverse direction of a moving, multiple layer web of polyethylene film. The apparatus includes a circular drum with a heated seal bar mounted flush with its cylindrical surface. The web of film wraps around the cylindrical surface of the drum and moves at the same speed. The web is pressed against the cylindrical surface by a least one rubber nip roll and is heat sealed in the area of the seal bar. The invention is particularly adapted for presealing the ends of the drawtape in the manufacture of drawtape bags.

REFERENCES:
patent: 2125758 (1938-08-01), Waters
patent: 3221613 (1965-12-01), Sanders
patent: 3466979 (1969-09-01), Sander et al.
patent: 3484325 (1969-12-01), Pendleton
patent: 3499817 (1970-03-01), Havens et al.
patent: 3644163 (1972-02-01), Schwartzkolf et al.
patent: 4030956 (1977-06-01), Leloux
patent: 4597750 (1986-07-01), Boyd
patent: 4624654 (1986-11-01), Boyd

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