| 摘要 |
PURPOSE:To provide a packing material which can be obtained with a simple manufacturing method without requiring a film lamination process and comprises polyolefin resin foam having excellent thickness accuracy and surface smoothness. CONSTITUTION:A packing material comprises polyolefin resin foam wherein an expansion ratio in an intermediate layer part is 15 times or less, an expansion ratio in a surface layer part is lower than the ratio in the intermediate layer part by 1 time or more and surface smoothness of the surface layer part is 3.0 or mum less. |
