MANUFACTURE OF MEMBRANE

PROBLEM TO BE SOLVED: To simply and securely protect a membrane from being dried during a manufacturing process by immersing the membrane into a trehalose water solution and retaining the moisture of the membrane in the case of manufacturing the membrane used for filtration or the like. SOLUTION: A membrane manufacturing raw stock solution as a core liquid is discharged from, for example, an orifice type double cylindrical cap and passed through the given dry length, and then introduced into a solidifying medium to form hollow yarns. Also the hollow fibers are introduced into a cleaning bath and cleaned therein and then introduced into a trehalose water solution bath of given concentration to manufacture moisture-retaining hollow fibers. The moisture-retaining hollow yarns are dried by a drier, and then hollow separating membranes 4 are boundled, and both terminals of a bundle are fixed on a glass tube module case 5 by a potting agent 2 to manufacture a mini- module. Then γ rays are emitted to the mini-module in the wet state, and then its blood inlet 1 is connected with a dialyzate outlet 6, and distilled water is made to flow out of a blood outlet 7 to clean the hollow yarns and the interior of the module, and water permeability and the β2 micro-globulin removing performance are measured.