| 摘要 |
PROBLEM TO BE SOLVED: To efficiently manufacture a large strength lightweight fiberboard irrespective of its low specific gravity. SOLUTION: Powdery size being a reactivating binder and water are added to a natural fiber, which are mixed. An inside of the fiber is impregnated with water. A surface of the fiber is dotted with the powdery size, and it is stuck thereto. After molding the mixture in a mat state, the mat state material is treated by heating by supplying heat and water content from its one face in a drying chamber and sucking vapor from the other face. While transpiration of water content in the mat-like material is prevented by this heating, the size stuck to the surface of fiber is activated (melted), and fibers are bonded to each other. Thereafter, a large strength low specific gravity lightweight fiberboard is obtained by drying treatment with only heat. |
