| 摘要 |
PURPOSE:To obtain a cap having light and sufficient fire-resistant for a center cap by impregnating solution of salt of a water soluble or alcohol soluble cyanamide derivative into a made paper material, after drying, heating, pressuring and molding to a prescribed shape. CONSTITUTION:The center cap 15 for a speaker is manufactured. First, the material in which NBKP is beaten and adjusted to a beating degree 20 deg.SR is prepared. After that, it is dispersed, becomes suspension and paper is made by a prescribed shaped paper making net. At this time, as raw material, after paper making, the materials are made dry. After that, a paper material which is obtained by phospholic acid di-guanidine solution (alcohol solution is also preferable.) with prescribed density is impregnated, an adhering quantity of phosphoric acid di-guanidine solution is adhered to paper materials up to 3%-15%, preferably, 7%-8%. Again, drying is executed. After that, the material is molded into a prescribed shape. |
