| 摘要 |
PROBLEM TO BE SOLVED: To provide a bag which has a superior powder leakage property, a heat seal process property, seal strength, etc. SOLUTION: A laminated nonwoven fabric is made by stacking a first layer made of a thermoplastic synthetic fiber, a second layer made of an extra-fine fiber, and a third layer containing a thermoplastic synthetic fiber having a melting point 30°C or more lower than that of the fiber composing the first layer, and putting the laminate into an integral form by heat pressure bonding. Sheets of the laminated nonwoven fabric are superposed one another with the third layer disposed inside, and the periphery of the superposed sheets is heat sealed to form a bag. The laminated nonwoven fabric forming the bag shows a gas permeability of 1 to 100 cc/cm<SP>2</SP>/sec., a maximum opening diameter of 50μm or less, a powder leakage rate of 10% or lower, and a rupture strength of 100 kPa or higher, and the third layer shows a seal strength of 10 N/25 mm or higher. COPYRIGHT: (C)2007,JPO&INPIT
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