POROUS PTFE HOLLOW FIBER SEPARATING MEMBRANE CONTROLLING SIZES OF A NODE AND/OR A FIBRIL ACCORDING TO A DISTANCE FROM A HOLLOW IN A SINGLE PTFE HOLLOW FIBER SEPARATING MEMBRANE WITHOUT INCREASING MANUFACTURING COSTS, AND A MANUFACTURING METHOD THEREOF

摘要

PURPOSE: Provided are a porous PTFE hollow fiber separating membrane capable of remarkably improving filterability and performing a precise filtration process wherein fluid passing through from the inside of the hollow fiber to the outside, and a manufacturing method thereof.;CONSTITUTION: A method for manufacturing a porous PTFE hollow fiber separating membrane comprises an extrusion and a drawing process in which gas having a lower temperature than an extruding temperature is injected into the hollow of the PTFE hollow fiber in the extrusion process or gas having a lower temperature than a drawing temperature is injected into the hollow of the PTFE hollow fiber in the drawing process.;COPYRIGHT KIPO 2013;[Reference numerals] (S1) Step of producing paste by mixing polytetrafluoroethylene (PTFE) powder and liquid lubricant; (S2) Step of extruding the paste in an extruder to preliminarily mold in a hollow fiber form; (S3) Step of injecting gas of low temperature inside the preliminarily mold hollow fiber and extruding in the extruder; (S4) Step of heating the extruded hollow fiber to remove liquid lubricant; (S5) Step of extending hollow fiber in which liquid lubricant is removed to form pores in hollow fiber; (S6) Step of plasticizing the extended hollow fiber