ZIPPER TAPE AND PACKAGING BAG WITH ZIPPER TAPE
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United States of America Patent
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Issued Date -
Nov 1, 2012
app pub date -
Dec 6, 2010
filing date -
Dec 11, 2009
priority date (Note) -
Abandoned
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Abstract
Since a rib having a thickness substantially equal to a thickness of each of first and second thick portions is provided in a cutting portion of a zipper tape, the first and second thick portions and the rib can be bonded to an inner surface when the zipper tape is bonded to a bag body. Accordingly, when tearing a packaging bag for opening, stress concentrates on a thin portion having a small tensile strength, so that the packaging bag can be cut at a single cutting position in the thin portion. Consequently, no cutting fragment is generated. Moreover, since a cutting line is positioned by the rib when tearing the packaging bag, the cutting line is not waved, so that the packaging bag can easily be torn with a linear cutting performance.
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