公开(公告)号：JPS62279926A

公开(公告)日：1987-12-04

申请号：JP12323586

申请日：1986-05-30

Applicant: TORAY INDUSTRIES

Inventor： OOTA TSUYOSHI ,  NAKANISHI KUNIO ,  HIBINO YASUNORI

IPC: B29C71/02 ,  B29C71/00 ,  B65H18/00

Abstract: PURPOSE:To make the title roll into a favorable form of the roll by preventing generation of creases during a period of time extending to a slit process, by controlling hours where an intermediate product of a polyester film of specific thickness is exposed to an atmosphere according to an atmospheric temperature. CONSTITUTION:A polyester film which has been manufactured to a specific thickness of less than 50 mu where a creasing defect is apt to dccur is wound up as an intermediate product which is slit into a beltlike film by rewinding the same, which is wound up as a final product. In this instance, when relative humidity of an atmosphere where the intermediate product is exposed until the same is slit is H [%] and time extending to start of slitting from an end of winding of the intermediate product is T (hour), an expression of T 45. When the humidity of a storing place of the intermediate product up to a slit process is less than 45%, a quantity of expansion through moisture absorption of the polyester film is low. However, when the time wherein the intermediate product exposed under the atmosphere is controlled short from the foregoing standard, also the moisture absorption, therefore, also the expansion quantity is controlled low even if the humidity is larger than 45%.