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    • 98. 发明专利
    • FOAMABLE BUFFERING MATERIAL
    • JP2001129907A
    • 2001-05-15
    • JP31514299
    • 1999-11-05
    • IDEMITSU PETROCHEMICAL CO
    • GOTO SHUICHI
    • B65D81/03B32B3/26B32B27/32
    • PROBLEM TO BE SOLVED: To provide a foamable buffering material which satisfies all of requirements such as transparency, high strength, thin wall and stable moldability. SOLUTION: Films 20, 30 are made of a polypropylene and a melt point differs between the first layer 21 side and the second layer 22 side of the film 20 having projecting parts and the second layer 22 side of the film 20. Consequently, the requirements such as transparency, high strength and thin wall of the foamable buffering material can be realized because the films 20, 30 used are made of a polypropylene. Further, because of the imparted melt point difference of the film 20 having projecting parts, it is possible to make the high melt point side to stick to a molding drum hardly soften compared to the low melt point side, when the film 20 is heated so that it can be molded. Thus the release properties of the film 20 from the molding drum can be upgraded while the moldability ensured by the softening of the low melt point side is maintained satisfactorily, so that the moldability is improved.