Device for heat shrinking film onto an open-topped container

Details Device for heat shrinking film onto an open-topped container Device for heat shrinking film onto an open-topped container

1992-04-27

1993-10-05

Sipos, John

Package making

Apparatus for contraction of cover by stretching or shrinking

By heat shrinking

533293, 533295, 1563799, 1563809, B65B 5302

Patent

active

052494101

ABSTRACT:
A device for heat shrinking thin film onto open-topped containers to form spill-resistant covers is shown. A radiant energy source is intermittently energized in association with timers to direct radiant energy towards the thin film. An energy absorbing body is associated with the thin film to absorb energy and create heat adjacent to the film which in turn causes the thin film to shrink. The energy absorbing body can be the adaptation of the thin film to be opaque to the radiant energy by either being coated with an energy absorbing coating such as printing, or being made partially opaque by means of tinting. The container can also be adapted to absorb energy by including a darkened band adjacent the upper edge of the rim. The device can also interpose an energy absorbing body, such as a darkened aluminum screen adjacent to the film to be heated to cause the thin film to shrink. The device shrinks the thin film around the rim first, then shrinks the film across the top of the container to form a spill-resistant cover. In one embodiment, printed patterns on the film can be used to create perforations.

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