Apparatus and method for differentially shrinking selected porti

Details Apparatus and method for differentially shrinking selected porti Apparatus and method for differentially shrinking selected porti

1993-10-04

1995-03-21

Gromada, Denise L.

Drying and gas or vapor contact with solids

Process

With nondrying treating of material

34493, 34216, 34217, 34526, F26B 700

Patent

active

053984277

ABSTRACT:
The present invention provides a method and apparatus directed, in the first preferred embodiment, to insulating a selected portion of a heat shrinkable film prior to applying heat. The insulating material is a roller applied liquid such as water which acts as a partial thermal barrier and restricts shrinkage in the coated portions of film. Portions of the film to which no insulating material is applied are shrunk to a greater extent than portions to which insulating material is applied. According to a second embodiment, a moderate amount of heat is applied by a heating plate to a portion of the film bottom. Application of greater amounts of heat subsequently shrink other portions of the film to a greater extent, and the moderately shrunk selected portion retains a smooth and wrinkle-free surface. Both embodiments are adapted to improve the quality, appearance and readability of printed portions of the film wrap.

REFERENCES:
patent: 3309835 (1967-03-01), Peppler
patent: 3616546 (1971-11-01), Billingsley et al.
patent: 4676006 (1987-06-01), Tolson
patent: 4738082 (1988-04-01), Saitoh
patent: 5062217 (1991-11-01), Tolson
patent: 5193290 (1993-03-01), Tolson

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