Spinning beam

A spinning unit comprising:

• a spinning beam comprising a plurality of honey combed structures, each honeycombed structure comprising six hexagonal spinneret seats arranged around a central hexagonal feed unit, the feed unit comprising, on each of its six faces, both a feed port for a polymer solution and a feed port for a center fluid, the feed unit being configured to receive a supply pipe comprising ducts for the polymer solution and ducts for the center fluid which correspond to the feed ports for the polymer solution and the feed ports for the center fluid, respectively, of the feed unit;
• and the feed unit comprising an electrical heating element arranged in its base,
• a plurality of spinnerets for producing hollow fiber membranes, each spinneret comprising a spinneret body having a hexagonal outer contour and an axially symmetric central cavity and comprising a duct for a polymer solution, a duct for a center fluid, the ducts connecting the central cavity to one of the outer faces of the spinneret body, and an orifice at the bottom of the central cavity;
• and a spinneret core arranged in the central cavity of the spinneret body, the spinneret body and the spinneret core together defining a circumferential cavity for a center fluid and a circumferential cavity for a polymer solution, the spinneret core comprising one or more ducts for a center fluid connecting the circumferential cavity to a central cavity of the spinneret core;
• and a capillary connecting the central cavity of the spinneret core to the orifice of the spinneret body;
• and a regulating screw sealing the top of the central cavity of the spinneret core and being configured to regulate a flow of a center fluid through the spinneret core by partially sealing the one or more ducts for a center fluid when the regulating screw is turned downwards, each spinneret being fastened in a spinneret seat of the spinning beam by self-locking, and
• a plurality of supply pipes, each supply pipe being fastened in a feed unit of the spinning beam,
• wherein each spinneret comprises an outer contour and each spinneret seat comprises an inner contour, and wherein the outer contour of each spinneret matches the inner contour of each spinneret seat.