| 摘要 |
PROBLEM TO BE SOLVED: To provide a seal free from leakage even if a flowable material to be filled is in contact with a sealing region by a method wherein a flexible film constituting a package by fusing opposing surfaces comprises at least one layer a metallocene catalyst added to a resin. SOLUTION: A flexible film includes a metallocene catalyst added to a resin as at least a sealing layer, wherein it preferably comprises coextrusion films each with a predetermined thickness including metallocene resin layers (30, 31, 32+33 or 34+33) with a polyethylene terephthalate layer laminated and low density polyethylene/linear low density polyethylene layers (220, 221, 222 or 223). A package can be filled with a liquid, paste, gel, emulsion, powder or the like, wherein it is especially useful for a flowable material containing a surfactant. Since a seal free from leakage can be obtained even if the flowable material contaminates a sealing region during a sealing process, the maximum capacity can be filled, an amount of the films used can be reduced, and also production speed can be improved. |
