| 摘要 |
PROBLEM TO BE SOLVED: To provide a packaging material easy to produce, having high mechanical strength, also excellent from a sanitary aspect and having proper air permeability. SOLUTION: The air permeable packaging material 1 has a biaxially stretched nylon film layer 2, a reinforcing material layer 3 having an air permeable part and a humidity permeable resin layer 4 having micropores formed thereto. The humidity permeable resin layer 4 comprises a resin composition wherein 30-300 pts.mass of a filler is added to 100 pts.mass of a thermoplastic resin and is laminated on the reinforcing material layer 3 by an extrusion lamination method. The laminate thus formed is stretched in a draw ratio of 1.02-2.0 times to form micropores to the humidity permeable resin layer 4. COPYRIGHT: (C)2004,JPO&NCIPI
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