| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide closed-cell polyurethane rigid foam having superior thermal insulation performance and improved sound absorptivity by using a surface depressions for satisfying a criteria. <P>SOLUTION: A polyurethane rigid foam panel having a closed-cell part not less than 90 %, having the depressions having a diameter of 0.1 mm to 10 mm, and the depth of 7 cm to 10 cm by 1 to 18 per one square centimeter on a surface, and allowing the depressions of at least two kinds of types to exist, is manufactured. <P>COPYRIGHT: (C)2005,JPO&NCIPI</p> |
