| 摘要 |
PURPOSE:To obtain a diaphragm having waterproofing and water resistance by impregnating, sticking and hardening an acrylic resin to a substrate made of a fiber, further installing a coat of an ultraviolet rays hardening type acrylic resin at the main surface of the substrate and maintaining an excellent acoustic characteristic. CONSTITUTION:A natural fiber, a chemical fiber or these mixtures 2 are beaten, dispersed in the suspension of the paper making tank, the paper making is executed with a desired diaphragm-shaped wire cloth, and after, the drying is executed under heating and pressure and the substrate is formed. Next, the substrate is impregnated to the liquid in which the acrylic resin is diluted with a solvent and the acrylic resin 3 is stuck to a fiber 2 which forms the substrate. After drying, a solution of the ultraviolet rays hardening type acrylic resin is stuck to the main surface of the substrate by the spraying and a coat 4 is formed. After that, the ultraviolet rays are irradiated and the coat 4 is fixed. |
