发明名称 |
PROCESS FOR PRODUCTION OF POLYTETRAFLUOROETHYLENE POROUS MEMBRANE, FILTER MEDIUM AND FILTER UNIT |
摘要 |
<p>Provided is a method of manufacturing a porous polytetrafluoroethylene (PTFE) membrane capable of achieving both a high collection efficiency and a low pressure drop, though it has a larger average pore size and a greater thickness than conventional porous PTFE membranes. This manufacturing method includes: stretching an unsintered polytetrafluoroethylene sheet by a factor of 5 to 30 in a predetermined direction at a temperature equal to or higher than the melting point of polytetrafluoroethylene; further stretching the stretched sheet by a factor of 5 to 40 in a direction different from the predetermined direction at a temperature lower than the melting point; and after the stretchings, heating the stretched sheet at a temperature equal to or higher than the melting point.</p> |
申请公布号 |
EP2000499(A4) |
申请公布日期 |
2010.04.14 |
申请号 |
EP20070739534 |
申请日期 |
2007.03.23 |
申请人 |
NITTO DENKO CORPORATION |
发明人 |
SUZUKI, MASATOSHI;UCHIDA, YOUJI |
分类号 |
C08J9/00;B01D39/00;B01D39/16;B01D71/36;B29C55/14;B29K27/18;B29L7/00 |
主分类号 |
C08J9/00 |
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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