초록 ▼

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 absor

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.

대표청구항 ▼

A method of forming a spill resistant top cover on a container having an open top, using a device having a radiant energy source, the method comprising: selecting a heat shrinkable thin film made from generally transparent plastic; adapting at least a portion of said heat shrinkable thin film to bec

A method of forming a spill resistant top cover on a container having an open top, using a device having a radiant energy source, the method comprising: selecting a heat shrinkable thin film made from generally transparent plastic; adapting at least a portion of said heat shrinkable thin film to become more absorbent to radiant energy than a transparent thin film; manually positioning said container relative to said device wherein said more absorbent portion can be exposed to said source of radiant energy; and placing said heat shrinkable thin film over the top of said container wherein said more absorbent portion hangs over an upper side edge of said container, subjecting said more absorbent portion of said heat shrinkable thin film to said source of radiant energy wherein said more absorbent thin film absorbs said radiant energy, creating heat, which causes said thin film to shrink around said rim and form a spill resistant cover over said open top of said container.