Abstract: A method for setting the ends of bundles of hollow fibers in an end wall contained within a housing are disclosed, including providing a bundle of hollow fibers having adjacent open end faces, supplying a hardenable liquid material to those end faces so that this material can penetrate between the hollow fibers and into the interiors thereof, and exerting a positive pressure within the housing containing the hollow fibers to control the degree of penetration of the hardenable liquid material both between and within the interior of the hollow fibers.

Abstract: Method of treating a cellulosic hollow fiber which is being particularly adapted for use in hemodialysis or a similar extracorporeal treatment of blood.According to the described method the hollow fiber, possibly after rinsing with an alcoholic solution or fluorinated hydrocarbons, is exposed to swelling with use of an aqueous solution prior to drying and/sterilization of the hollow fiber.Examples of aqueous solutions can be water, water/glycerol, and water/glycerol/alcohol. Preferably said aqueous solution contains glycerol in an amount of 4-35%, such as 12-35%, preferably 16-35%.The aqueous solution can be applied to the inside and/or the outside of the hollow fiber so as to bring about a diffusive and/or a convective transport of water and/or glycerol into the hollow fiber wall.