Method and apparatus for making zipper bags
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United States of America Patent
Stats
-
Feb 12, 1985
Grant Date -
N/A
app pub date -
Jan 3, 1983
filing date -
Jan 3, 1983
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A method and apparatus for attaching heavy weight plastic zippers to light weight plastic bag material. The method includes the steps of aligning the zippers with the bag material and holding the zippers and bag material between a pair of belts. The motion of the bag material drives the pair of belts at the same speed. Heated rails are pressed lightly against one of the belts so that heat passes through the belt and heats the bag material and zipper material only enough to seal the back of the bag material to the back zipper piece. The bag material is then held over a roll, and heated air is directed along a line to heat only the front piece of the bag material and the front zipper piece enough to seal. The bag material is then slit in the middle, and side sealed and cut by conventional means.
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