Sumitomo Chemical Company, Limited

Tatsuya Sakamoto

Koji Kashu

Jian Wang

Yusuke Kon

A method of film production includes the steps of obtaining defect information including information on the position of a defect (D) in a separator original sheet (), slitting the separator original sheet () to produce a plurality of separators (), and determining, on the basis of the defect information on a single defect (D), that a separator () actually having the defect (D) and another separator () adjacent to the above separator () are defective.

Film production method and film production device

A method for film production includes the steps of obtaining information on the position of a defect (D) in a separator () and providing marks (LA, LB) at the respective positions in the vicinity of the defect (D), the marks indicating the position of the defect.

A separator producing method includes the steps of: winding up, around a core (), a separator () having a defect (D) detected; and providing a defect code (DC) including information on a position of the defect (D) in the longitudinal direction of the separator () on (i) the outermost portion () of the separator (), wound around the core (), or (ii) the core (), around which the separator () is wound.

Growing community of inventors

Niihama, Japan

Tatsuya Sakamoto