| 摘要 |
PROBLEM TO BE SOLVED: To provide a method of manufacturing a polyethylene hollow fiber porous membrane simultaneously having dense microspores and high water permeability, which is suited for the use in turbidity removal by the filtration. SOLUTION: In the method for obtaining a polyethylene hollow fiber porous membrane by fusing a polyethylene and an organic liquid at a high temperature, extruding the fused liquid into a liquid into a liquid bath to solidify the fused liquid by cooling through the air to constitute hollow fibrous state and then extracting and removing said organic liquid, (1) the liquid bath is constituting of two layers wherein the upper layer part comprises a liquid immiscible with water having an activity to separatee polyethylene in liquid-liquid phase at a high temperature and the lower layer part comprises water, and (2) the hollow fibrous material is elongated so that the elongation retention becomes from 5% or more to 150% or less prior to or after the organic liquid after the solidifying by cooling procedure is extracted and removed.
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