To improve heat resistance and sealability by a method wherein an inner bag to be used for filling edible oil in a metal can or a carton can is formed of a nylon film, for which the temperature on start of thrusting indenter is at a specified level or more.
For an inner bag that is suitably used on recovery of used edible oil being at a high temperature, a nylon film, for which not only the melting point is above 200°C, but also the temperature on start of thrusting indenter is at least at 210°C, is used. For the nylon film, a mixture of nylon 6 and nylon 66 made up by mixing in weight percentage of 6-0:4-10, 6-2:4-8, or desirably of 5-3:5-7 is used. The nylon film is desirably made up by molding in air-cooled blown film extrusion. Therefore, the inner bag for edible oil that is heat resistant, being available for sealing and reuse after recycling can be obtained.
SHIRAI MASAFUMI
MATSUDA SADAO
SAITO MITSUHIKO
