Film roll for the core, the film roll, a method of manufacturing a film roll, and the take-up device of the film

摘要

object of the present invention, the external even better handleability can be held at both ends both ends has a sufficient strength, condensation on the inner circumferential surface have weight and cost reduction can be achieved occurs flowing hard core for the film roll in; core for the film roll can also reuse the members other than the member or, in cases where abrasion occurs; slip between the holding member and the film core roll, stable film wound is to provide a core for the film roll that can such as. The present invention provides a tubular core film roll core tube a film core roll comprising a core tube having a thin inner diameter is greater than the both end portions in the axial center portion of the; film roll comprising a cylindrical core tube a use core, core tube, core film roll having a removably mounted cylindrical edge members at both ends; a film core roll having a cylindrical core tube, the opposite end portions, It relates to a film core roll having an engaging portion for restricting the relative rotation with respect to the holding member.