发明名称 |
Electret fiber sheet and method of producing same |
摘要 |
An electret fiber sheet has polarized charges on its surface and preferably has charges in ordered orientation across it. The polarized charges are present in an amount of at least 7x10-11C/cm2. Such sheets are formed to have a dust collecting efficiency. Sheets having an amount of polarized charge even as high as this are nevertheless stable when they have a maximum orientation energy of depolarization of at least 0.2 eV. Such an electret sheet can be obtained by a process comprising placing a fiber sheet between a non-contact type voltage-application electrode and an earth electrode confronting each other and supplying electricity (voltage>3 kV; current density>1x10-6mA/cm2) between the electrodes, provided that the fiber sheet has a weight less than 80 g/m2 and a covering factor at least 60%. The electret fiber sheet is useful in a variety of applications, such as filter materials, especially for collection of micro dust; clothing and furniture apparel for industrial clean rooms; adsorbing materials; and medical materials such as masks and collectors of bacillus.
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申请公布号 |
US4874659(A) |
申请公布日期 |
1989.10.17 |
申请号 |
US19850790572 |
申请日期 |
1985.10.23 |
申请人 |
TORAY INDUSTRIES |
发明人 |
ANDO, KATSUTOSHI;OGAWA, YO |
分类号 |
B01D39/08;B03C3/28;H01G7/02 |
主分类号 |
B01D39/08 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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