| 摘要 |
A rotating perforation apparatus contains a plurality of needle points (or other piercing features) formed along a free-wheeling support bar, where the bar is positioned to contact the film while it is being unrolled and is in a 'tensioned' state (in some embodiments, immediately prior to contacting the element to be wrapped). In particular, the free-wheeling perforation apparatus contacts a mechanized film roller such that the exposed needle points will rotate against the mechanized roller and make the perforations in the film as it travels over the film roller. As long as the film roller is formed of a pliable material, the needles will pierce the film and create the desired perforations. The size and placement of needles can be adjusted to provide the required pattern of perforations, as well as dictate the size of the actual perforations.
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