| 摘要 |
PURPOSE:To attain a diaphragm with low density, light weight, proper internal loss and moisture proof effect by manufacturing to sheet a foaming grain and natural or chemical fiber with cross-linked linear resin being soft even after heating and a surface size agent as a binder and foaming the mixture while heating the foaming grain. CONSTITUTION:An NUKP pulp as the natural fiber 1 is adjusted to a prescribed beating factor of 20 degrees by a beating machine. Then 30pts.wt. of a vinylidene chloride foaming grain in an unfoaming state as the foaming grain 2 are added to the fiber and in bonding and fixing them, the bonding is conducted by an aqueous solution including nearly 0.2% of carboxymethylcellulose CMC as the surface size agent and the fixing is conducted by using an aqueous solution including nearly 2% of water soluble linear high polymer with a methylol group subject to a pendant as a functional group as the cross-linked linear resin and adding it gradually. After they are mixed sufficiently, a prescribed form of the diaphragm is manufactured to sheets. A minute change in the Young's modulus, decreased density and proper internal loss, and also excellent moisture proof and the anti-folding strength are successfully attained at the same time with the diaphragm. |
