| 摘要 |
PROBLEM TO BE SOLVED: To improve sound absorption performance from both surfaces of vacuum soundproof material in a vacuum body in which a three-dimensional molding is used for shape retention. SOLUTION: This vacuum soundproof material is constituted in such a manner that, with respect to a shape of the three-dimensional molding 2 which retains the shape of the vacuum body 1, the periphery 4 of bottom surfaces 3 is made to be the same surface, central parts form the bottom surfaces 3 in the internal direction of the three-dimensional molding, opening parts 6 are disposed for weight-lightening, the upper surface has a bent piece 9 which is extendedly disposed on the whole periphery of a rising part, and airtight material 7 which is light in weight is airtightly bonded to the periphery 4 of the bottom surface 3 and the bent piece 9. |
