A core prevents or reduces misalignment of a battery separator wound around the core. The core has one or more grooves in the outer peripheral surface thereof. The grooves extend substantially in the width direction of the core. The grooves have a depth of 30 m or greater, and the following condition (1) is satisfied:

N/D>0.0025 (1)

where D is the outer circumference in mm of the core and N is the number of the grooves in the outer peripheral surface.

A core (u1, u2) around which a nonaqueous electrolyte secondary battery separator is to be wound. A side surface of the core (u1, u2) has a depression (20). This makes it possible, in a case where cores (separator cores) are stored by being stacked while still wet after cleaning, to prevent damage to a core caused by a problem where cores stick together and an core lower in a stack falls when a core higher in the stack is removed.

A cable spool for use in automated cable winding applications, said cable spool comprising a barrel having an outside diameter and a length, and two annular flanges located at opposite ends of said barrel, wherein each one of said flanges has an inward facing side directed towards said other flange and an outward facing side, each one of said flanges includes at least one through-hole extending between said inward facing side and said outward facing side, wherein each one of said through-holes forms a start hole, and each one of said flanges includes at least one reinforcement portion positioned between said barrel and said through-holes, wherein said at least one reinforcement portion has a height measured in a radial direction from a lateral surface of said barrel to a distal edge of said at least one reinforcement portion.

A method for producing a cable spool including the steps of providing a mold for producing a cable spool, assembling said mold by joining said at least two central mold pieces and said first and second flange mold pieces, adding molten polymer material to said mold, removing said mold and cooling said cable spool. Also, a mold for producing a cable spool, said mold including at least two central mold pieces, a first flange mold piece and a second flange mold piece. Also, a plastic cable spool including a barrel and two annular flanges located at opposite ends of said barrel, wherein each one of said flanges has an inward facing side directed towards said other flange and an outward facing side, and each one of said flanges includes a through-hole extending between said inward facing side and said outward facing side.

In order to provide a film roll that includes a core having improved rigidity without increasing a cost, the present invention provides a film roll including: a cylindrical core; and a film wound around an outer peripheral surface of the core, the core satisfying the following inequality: D0.0017+0.50<T1/T2<D0.0017+0.95, wherein D (mm) denotes a difference between an outer diameter of the core and an inner diameter of the core, T1 (mm) denotes a thickness of an outer peripheral part, and T2 (mm) denotes a thickness of an inner peripheral part.

The present invention pertains to a single-piece flange adapted to be a part of a reel or spool, wherein the flange includes: (a) a hub portion defining one or more apertures, wherein the hub portion comprises an outer face and a wire face; (b) an outer rim; (c) a side wall disposed between the hub portion and the outer rim, wherein the side wall comprises an outer face and a wire face, and a plurality of crack propagation inhibitors extending through a thickness of at least the sidewall; and (d) a plurality of ribs connected to the side wall, and extending toward the hub portion.

Belt core and belt core systems for winding a belt or other winding material are described. The belt core and belt core system described are lightweight and reusable. The belt core and belt core system includes at least one belt core unit. A plurality of units may be combined to form a belt core system, in which each unit has the same general size and is configured with means for interlocking each unit with another unit. This provides customization of the described system so that it may accommodate a winding material of any width.