Unit for heat-sealing plastic film used to wrap palletized stack

Details Unit for heat-sealing plastic film used to wrap palletized stack Unit for heat-sealing plastic film used to wrap palletized stack

1993-10-20

1995-07-11

Johnson, Linda B.

Package making

Apparatus for contraction of cover by stretching or shrinking

53587, 53588, 533759, B65B 1102, B65B 1104, B65B 5110, B65B 5300

Patent

active

054309956

ABSTRACT:
The end of a length of stretch film enveloping a pallet is restrained, prior to being heat-sealed, by a gripping mechanism that can be traversed toward and away from the pallet, and is capable of contracting longitudinally in a direction parallel to the plane occupied by the tail end of the film, transversely to the wrapping direction, from a position of engagement in which the gripping surfaces are spaced apart and uniformly in contact with the film over its maximum width, to a position of restraint in which the selfsame surfaces are drawn together, pinching the film to produce a uniform succession of folds and thus narrowing the material to a width that can be accommodated fully by the heat-seal plate.

REFERENCES:
patent: 4216640 (1980-08-01), Kaufman
patent: 4563863 (1986-01-01), Humphrey
patent: 4619102 (1986-10-01), Geisinger
patent: 4747252 (1988-05-01), Kapke
patent: 5005335 (1991-04-01), Yourgalite et al.
patent: 5088270 (1992-02-01), Diehl

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