| 摘要 |
PURPOSE:To enhance the production efficiency of an integrated soundproofing material and at the same time obtain excellent soundproofing effect by a method wherein urethane foam material stock liquid is poured between a top force, onto which a vibration damper consisting of a restrained material and a vibration damping sheet is fixed by suction, and a bottom force, on which a skin material is seated, for foaming and integration. CONSTITUTION:Firstly, a skin material is seated on a bottom force. Next, a vibration damper, which is formed in a predetermined shape, is fixed onto the inner surface of a top force by suction developed through evacuation including vacuumization. Urethane foam material stock liquid is poured between the skin material and the vibration damper of a set of the forces assembled with the top force and the bottom force set as described above and expanded. As a result, urethane foam material is bonded to the skin material and to the vibration damper so as to make all of them into an integral body. The vibration damper consists of a vibration damping sheet and a restrained material. As the restrained material, formable plastic is preferable and steel plate such as steel plate, aluminum plate or the like may be used. Further, as the vibration damping sheet, a sheet, which contains petroleum resin having the melting point of 60-180 deg.C and is tacky, is preferable from the viewpoint that bonding can be only by putting the sheet on the restraint material. |
