Substrate of and core for photosensitive material.

摘要

A substrate of a photosensitive web material of which the base end portion is gradually thinned toward the base end a core for a rolled photographic film which comprises a core body and a crosslinked foamed sheet having an expansion ratio of 18 to 45 times and a thickness of 0.2 to 2.0 mm which contains more than 50 wt. % in the sum of one or more members selected from the group consisting of polyethylene resin having a density of less than 0.930 g/cm<3>, ethylene-vinyl acetate copolymer resin having a comonomer content of less than 25 wt. % and ethylene-ethyl acrylate copolymer resin having a comonomer content of less than 25 wt. % in disposed on the surface of the core body. These substate and core sharply reduce the occurrence of marking troubles and pressure mark troubles on the photosensitive web material near the core caused by the difference in level induced by the base end portion of the web.