| 摘要 |
<p>PURPOSE:To obtain a porous membrane of polytetrafluoroethylene with finer pares in comparison with those of conventional similar membranes by welding a fine-porous membrane of polytetrafluoroethylene together with a thermoplastic resin other than a fluorine contained resin. CONSTITUTION:A PTFE fine-porous membrane 11, an FEP film 12, and a PTFE fine-porous membrane 8, which has pares of smaller size than the PTFE membrane 11, are piled up on a polypropylene support plate 2, and they are heat-pressed to enable the PTFE fine-porous membrane 8 to be welded. In this way, a PTFE porous filter is obtained, having finer pores in comparison with those of conventional similar membranes.</p> |
