Constant contact lay-on roll winder
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United States of America Patent
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-
Jul 30, 1991
Grant Date -
N/A
app pub date -
Apr 8, 1986
filing date -
Apr 8, 1986
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An improved turret type winder incorporates articulated constant contact lay-on rolls mounted concentrically with chucks at the ends of the arms of the turret winder. The articulated constant contact lay-on rolls are continuously repositioned radially during winding and are able to either maintain constant pressure or to reduce lay-on roll pressure as the film bundle diameter increases. Web tension variations during transfer operations are minimized by maintaining an essentially constant wrap angle on the lay-on roll between the web and the lay-on roll. An improved web feed-in mechanism is incorporated to reduce web tension variations due to drag forces. An improved method for winding film bundles is also provided whereby the nip pressure is varied during winding and then maintained at an about constant value during turret rotation.
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