Separator winding core, separator roll, and method of producing separator roll

Abstract

A separator winding core is configured such that at least one of side surfaces has a large frictional force between the side surface and one side surface of another separator winding core of the same type. Such a separator winding core is less likely to fall down when it is stacked on another separator winding core of the same type. Provided is a separator winding core having side surfaces around which no separator is to be wound and at least one of which has an arithmetic mean roughness of not less than 0.16 μm. The separator winding core is stackable with one or more other separator winding cores of the same type in such a position that one of the side surfaces of the separator winding core faces upward while the other one of the side surfaces of the separator winding core faces downward.

Dependencies are inferred from the claim text.