| 摘要 |
PURPOSE:To increase electrostatically charged amount and to obtain an electrostatic type air filtration filter which is less in deterioration with lapse of time and large in dust collecting capacity by converting hollow structure fiber of nonwoven fabric mixed with synthetic fiber of hollow structure to electret. CONSTITUTION:Wool fiber of about 17-20mum fiber diameter as essential component is mixed with synthetic fiber which is high in insulating resistance and small in moisture-absorption characteristics and has hollow structure, and worked to nonwoven fabric. Polyester, polyamide and polypropylene or the like are used as synthetic fiber. Resin such as phenol is impregnated in the nonwoven fabric or coated thereon and furthermore static electricity is generated by performing mechanical secondary work such as tanning, bending, beating and crushing. Since the negative charge of surface of fiber 1 is transferred to the resin 3 and the resin 3 is peeled from the surface of fiber, electrical imbalance is caused between the internal space surface of the hollow fiber 1 and the surface of fiber and static electricity is generated thereby. |
