| 摘要 |
PROBLEM TO BE SOLVED: To provide a water retentive sheet having a sufficient water retentivity, and excellent fire and weather resistance. SOLUTION: In the water retentive sheet comprising two upper and lower layers, the upper layer is a fibrous structure which is composed of a synthetic fiber containing 0.01-2 wt.% of pigment and is 50-1,000 g/m<SP>2</SP>in weight. The lower layer is a fabric comprising a nonflammable fiber and having a cover factor of 0.30-0.80. The coefficient of permeability of the upper and lower layers satisfies the relationship of (1×10<SP>-4</SP>cm/s<coefficient of permeability of lower layer<coefficient of permeability of upper layer<5×10<SP>-1</SP>cm/s). COPYRIGHT: (C)2008,JPO&INPIT |
