Method for transverse sealing of film wrapped around a product

Details Method for transverse sealing of film wrapped around a product Method for transverse sealing of film wrapped around a product

1996-04-16

1997-09-16

Johnson, Linda

Package making

Methods

Conforming by stretching or shrinking of cover over contents

53450, 53463, 53479, B65B 900, B65B 5302

Patent

active

056667884

ABSTRACT:
A method for heat sealing a film with a smooth seam which extends the transverse width of a wrapped package utilizes a mechanism having a cool clamping portion and a hot sealing portion which are sequentially actuated. The clamping portion, with segments upstream and downstream of a sealing position, is activated to firmly hold the film. The sealing portion is located between the upstream and downstream segments of the clamping portion. The heated sealing portion is brought into very brief, instantaneous contact with the film and retracted, leaving the clamping portion in contact with the film for a comparatively long time to allow longitudinal film shrinkage and prevent transverse film shrinkage of the film. Lastly, the clamping portion separates and the next package in a succession of film-enclosed packages is moved downstream of the sealing position.

REFERENCES:
patent: 4574566 (1986-03-01), Eaves et al.
patent: 5058361 (1991-10-01), Schmacher
patent: 5271210 (1993-12-01), Tolson

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