Water vapor barrier property evaluation method of gas barrier film, water vapor barrier property evaluation test piece, and gas barrier film

摘要

An object of the present invention is to provide a gas barrier film capable of detecting with high precision the periodicity of a long stripe-shaped fine flaw or a transverse gas-barrier change. The gas barrier film (1) of the present invention is provided with a gas barrier layer (5), first and second water vapor barrier properties test region (10, 20) on an elongated resin substrate (4), The first and second water vapor barrier test area portions 10 and 20 are configured to seal the first or second moisture-reactive metal layers 12 and 22 and the first or second moisture-reactive metal layers 12 and 22, respectively. It has a first or second water vapor impermeable layer (11, 21), wherein the first moisture-reactive metal layer (12) and the second moisture-reactive metal layer (22) are formed in at least one of a longitudinal direction and a width direction of the resin substrate (4). When viewed from one side, it is characterized in that it forms a configuration in which the portions (L1) partially overlapping each other are arranged to exist.