| 摘要 |
PURPOSE:To obtain a diaphragm which is high in a Young's modulus, low in density, has a suitable internal loss, is excellent in an acoustic characteristic and have water-proofing and weather resistance by impregnating the solution of acrylic resin to a substrate made of paper yarn fabric, sticking and hardening. CONSTITUTION:A natural fiber, a chemical fiber or these mixtures are thrashed and adjusted to a thrashing degree 20-22 deg. SR. After that, they are dispersed in the suspension of a paper making tank and the paper making is executed with a desired diaphragm-shaped wire cloth. They are dried under pressure by a mold with the temperature of about 180 deg.C to form a substrate. Next, the substrate is impregnated in the liquid in which the acrylic resin is diluted with a solvent and after impregnating and sticking the substrate, the drying is executed for the substrate. |
