| 摘要 |
PURPOSE:To obtain the hardness and water proof more than a thermosetting resin has by making natural and chemical fibers or their mixture, impregnating a polyurethane resin solution and constituting a diaphragm from a dried and cured basic material. CONSTITUTION:Since a fiber 1 is filled by a polyurethane resin 2, the strong bondage between the fibers 1 improves the water proof due to the resin 2. Provided that the fiber 1 means a natural or chemical fiber, and a basic material 4 is formed by making the natural or chemical fiber alone or their mixture. |
