| 摘要 |
To produce a filtering material for adsorptively capturing very fine particles such as fungus, pollen, virus, bacteria or the like at a high efficiency, an aqueous treatment solution (2) is first prepared by dissolving porous apatite particles of 0.5 to 40 % by weight, preferably, 0.5 to 30 % by weight and a water soluble glucan of 0.5 to 15 % by weight in water. A sheet-shaped raw material (5) is then coated with the treatment solution (2) with the aid of a rotating drum (4) of which part is always dipped in the treatment solution (2), and thereafter, the sheet-shaped raw material (5) having the treatment solution (2) coated thereon is dried. Alternatively, an aqueous treatment solution prepared by dissolving only a water soluble glucan of 0.5 to 25 % by weight in water may be substituted for the aforementioned aqueous treatment solution (2). In this case, after a sheet-shaped raw material (5) is coated with the treatment solution (2), porous apatite particles are deposited on the sheet-shaped raw material (5) by employing a dispersing process or a spraying process before the treatment solution (2) coated on the sheet-shaped raw material (5) is kept still wet. Subsequently, the sheet-shaped raw material (5) having the treatment solution (2) coated thereon and the porous apatite particles deposited thereon is dried. <IMAGE> |
