发明名称 |
Nonwoven material of two or more layers, in particular with¹long-term filter properties, and manufacture thereof |
摘要 |
<p>A description is given of a multi-layer filter material composed of non-woven fabrics, which are prepared from fibres or filaments of identical or different polymers, the filter material being composed of a deep bed filter and a fine filter, both of which have a homogeneous density perpendicular to their surface, and are connected together in such a manner that the surface occupied by the connection points does not exceed 75% of the total filter surface. …<??>The deep bed filter has a thickness 2- to 20-times that of the fine filter layer and the deep bed layer and the fine filter layer have a different packing density. …<??>A process for the production of the filter material is also described.</p> |
申请公布号 |
IE904388(A1) |
申请公布日期 |
1991.06.19 |
申请号 |
IE19900004388 |
申请日期 |
1990.12.05 |
申请人 |
HOECHST AKTIENGESELLSCHAFT |
发明人 |
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分类号 |
B01D39/08;B01D39/14;B32B5/12;D04H3/011;D04H3/02;D04H3/12;D04H13/00;(IPC1-7):D04H/;B32B27/14 |
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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