METHOD FOR MANUFACTURING SEPARATOR WEB, METHOD FOR MANUFACTURING SEPARATOR, SEPARATOR WEB, AND APPARATUS FOR MANUFACTURING SEPARATOR WEB

To easily specify the position of a defect in a separator, a method for producing a separator original sheet () includes the steps of: forming a separator original sheet () including a separator original sheet () and a heat-resistant layer coated on the separator original sheet (); detecting a defect (D) in the separator original sheet (); and recording information including information on a position of the defect (D) which position is a position in the width direction of the separator original sheet ().