| 摘要 |
PROBLEM TO BE SOLVED: To secure and maintain the stable quality of a product formed of a sheet-like base material by preventing the formation of winding wrinkles of the sheet-like base material, and improving yield in a length direction and a width direction. SOLUTION: An expander roller 43 rotatable around a rotation axis and having many spiral line grooves formed in lateral symmetry on the outer peripheral side face from the center part toward both end parts along a longitudinal direction, inclining at a specified angle from the center part toward both end parts is installed so that the axis is almost parallel with the axis of a winding core 41. At the start of winding the sheet-like base material 1, the expander roller 43 is brought into pressure contact with the outer peripheral side face of the winding core 41 through the sheet-like base material 1, and tentering of the sheet-like base material 1 is performed by many line grooves while- pressing out wrinkles from the center part to both end parts. In a stage where the sheet-like base material 1 is wound into specified length, the pressure contact of the expander roller 43 is released, and winding by the winding core 41 is continued.
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