Method of treating zipper to remove camber

Details Method of treating zipper to remove camber Method of treating zipper to remove camber

A - Human Necessities

44

B

A44B 19/42 (2006.01) A44B 19/16 (2006.01) B21D 25/00 (2006.01) B21D 53/50 (2006.01)

Patent

CA 2366835

A method and apparatus for removing camber from zipper with profiles having interlocking elements and or webs. The zipper is stretched longitudinally in a manner so that the interlocking elements stretch relative to each other. To this end, the zipper is fed to an idler wheel that may be spring loaded. From a set of first drive wheels and fed from the idler wheel by a set of second drive wheels. The second drive wheels are driven faster than the first drive wheels to effect the stretching. Alternately only the second set of drive wheels are driven and the stretch is provided by the spring loaded idler wheel or the zipper is driven around a static curved surface.

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