Method and apparatus for providing an improved seam seal in a vertical form fill and package apparatus
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United States of America Patent
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N/A
Issued Date -
Mar 4, 2004
app pub date -
Mar 19, 2003
filing date -
Aug 27, 2002
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
An improved method and apparatus for enabling unsupported packaging film (e.g., low density polyethylene, linear low density polyethylene, and high density polyethylene) to be sealed in a tube in the process of making a flexible package. A 'following belt' is provided which allows for a sandwiching effect to be imported on the film as it passes through its welding zone. In the prior art, while in this welding zone the polyethylene film would move with a conventional band seal assembly. But the opposite side of the polyethylene film would have to move relative to a drag iron this causing potential friction, seam failure and poor tracking. The present invention's use of a following belt allows the elements on both sides of the unsupported film to move with the film.
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