| 摘要 |
PURPOSE:To obtain hollow fibers for artificial kidneys, having high a dialytic performance, and filled with a gas in the hollow parts thereof, by extruding a spinning solution of copper- ammonia cellulose through an annular spinneret, introducing a gas from the central part of the spinneret simultaneously to fill the hollow parts, and making the extruded filamentary spinning solution fall freely and rush vertically into a coagulating solution below the liquid surface of the coagulating bath. CONSTITUTION:A spinning solution of copper-ammonia cellulose is extruded through an annular spinneret into a coagulating bath in the form of annular form, and a gas, e.g. nitrogen gas, is simutaneously introduced from an introductory pipe of the gas attached to the central part of the annular spinneret to fill the hollow parts. The extruded filamentary spinning solution is then made to fall freely and introduced into a coagulating bath positioned thereunder. The length of falling is set to make the spinning solution break through the liquid surface of the coagulating bath almost vertically only by the downward force of the solution obtained in the free falling and rush into the coagulating bath to 2-10mm. depth below the liquid surface, and the spinning solution is coagulated to give the aimed continuous hollow fibershaving hollow parts continuously passed through the whole length thereof, wall thickness of several microns -60microns with a circular cross section, 50-100microns inside diameter and the hollow parts filled with the gas. |
