Plastic film punching apparatus
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United States of America Patent
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Dec 6, 2016
Grant Date -
Mar 5, 2015
app pub date -
Aug 21, 2014
filing date -
Aug 30, 2013
priority date (Note) -
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Abstract
A plastic film punching apparatus is improved to prevent a waste 15 from being caught in a cylindrical punch blade 2. The apparatus includes a punch blade 2 comprising a saw-toothed edge which includes mountain portions and valley portions formed alternately with each other. A protrusion 5 is disposed internally of the punch blade 2 to protrude beyond the position of height H1 of the bottoms 7 of valley portions and toward the position of height H2 of the tops 6 of mountain portions. An annular clearance 8 is formed between the punch blade 2 and the protrusion 5.
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