| 摘要 |
PURPOSE:To prevent a slippage in winding and longitudinal wrinkling from occurring, by using rolls each having its diameter which increases toward the center section of te roll from each end thereof, as a spool core and a path roll which is arranged in the vicinity of the spool core. CONSTITUTION:A web 1 is wound up on a spool core 2 by way of a path roll 3. In this arrangement, a crown rolls each having a wind-up shaft section whose diameter increases toward the center section from each end thereof (the diameter is increased by 0.1-10mm with respect to the width of a roll which is 1m), are used as the spool core 2 and the pass roll 3. As a result, the tension in the center section of the web 1 may be increased so that the center section is firmly wound up in comparison with the other sections, and therefore, there is a less possibility of occurrence of a slippage in winding even though the tension in winding is low. Further, since the center section of the web is firmly wound up while edge sections are slackly wound up, air introduced by the web may be easily relieved from the center section to the edge section thereof, and therefore, there is a less possibility of occurrence of longitudinal wrinkles.
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