Device and method for bundling hollow fibre membranes

An apparatus for bundling hollow fiber membranes, comprising a lower part comprising a lower tube half-shell having two side edges and an inner side comprising a concavely curved surface for receiving an array of hollow fiber membranes, an upper part comprising an upper tube half-shell complementary to the lower tube half-shell and having two side edges and an inner side comprising a concavely curved surface wherein lower part and/or upper part are arranged movably relative to each other in the apparatus, and wherein the apparatus is configured such that the lower part and the upper part are positioned in a first position such that the lower tube half-shell is capable of receiving an array of hollow fiber membranes in the first position, and the lower part and upper part are positioned in a second position such that the lower tube half-shell and the upper tube half-shell enclose a cavity such that an array of hollow fiber membranes present in the cavity is capable of being bundled.