Closure strips for bags
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Jan 11, 1994
Issued Date -
N/A
app pub date -
Jun 3, 1992
filing date -
Jan 2, 1991
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A string zipper, with no mounting flanges, is welded to bag material for forming zipper bags. The zipper material is fed from a driven unwind and the bag material receives the zipper material. Guides place the zipper material wherever desired with respect to the bag material. The bag material, with the zipper material, is held between continuously moving belts. Stationary heaters are places against the belts, and provide heat through the belts sufficient to weld the bag material to the zipper material. The zipper material is then heated as a preseal before the material is contacted by the side welding blade which completes the seal and separates discrete bags.
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