Method and apparatus for securing stretchable film using vacuum
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United States of America Patent
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May 26, 2009
Grant Date -
Dec 15, 2005
app pub date -
Apr 22, 2005
filing date -
Jun 15, 2004
priority date (Note) -
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Abstract
A vacuum wheel for securing and retaining various sizes of stretchable film is disclosed. The outer surface of the vacuum wheel includes an advantageous pattern of vacuum openings and vacuum slots, wherein the vacuum slots provide vacuum communication between at least two of the vacuum openings. A preferred embodiment provides a chevron or zig-zag shaped pattern of vacuum openings and vacuum slots configured to provide improved vacuum holding strength.
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