Longitudinal sealer for bag maker-packaging machine

Details Longitudinal sealer for bag maker-packaging machine Longitudinal sealer for bag maker-packaging machine

1997-06-25

1999-07-20

Coan, James F.

Package making

Progressively seamed cover web or web folds

With closing of web between package units

53551, 533759, B65B 906

Patent

active

059242680

ABSTRACT:
As a cylindrically formed web of thermoplastic bag-making material is transported longitudinally along a path at a specified speed, a longitudinal sealer with a heater is compressed against and over portions of the material parallel to the path to effect longitudinal sealing. The longitudinal sealer is moved in the meantime along the path at a greater speed in the range of 1.05 to 1.30 times the specified speed of motion of the material such that generation of V-shaped wrinkles known as the chevrons on both sides of the sealed area can be prevented.

REFERENCES:
patent: 4035984 (1977-07-01), Gerlach et al.
patent: 4073116 (1978-02-01), Glover
patent: 4102111 (1978-07-01), Nack et al.
patent: 4712357 (1987-12-01), Crawford et al.
patent: 4829746 (1989-05-01), Schmidt et al.
patent: 5247781 (1993-09-01), Runge
patent: 5279098 (1994-01-01), Fukuda

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