| 摘要 |
PURPOSE:To hold down the extent of hardness unevenness within the desired range as well as to check the quantity of a film loss to the possible smallest extent, by setting a traverse quantity in a way of relating a cross direction drawing multiplying factor of the biaxial oriented polyester film to a pitch of a ferrule slit clearance adjusting bolt. CONSTITUTION:A cross direction drawing multiplying factor of a biaxial oriented polyester film is set to a range of 2.0-4.0 times, and under this state, it is made up of having relations between a traverse quantity Lmm at the time of winding, the cross direction drawing multiplying factor T and a bolt pitch Pmm of a ferrule slit clearance adjusting bolt set to L>=2(4-T)PT. The way to traverse the film in the cross direction will do in either method of traversing the film itself to be fed to a take-up roller, or that of traversing the film to be fed with respect to the wound film by traversing the take-up roller. A traverse speed at the time of winding is not specially restricted, but it is desirable to be 50-2,000m/period in film winding length. |
