An extruding nozzle (19) is provided at one side of the stabilizing and extruding member and a cutter (20) driven by a motor abuts against the outside of the extruding nozzle.

An air injection nozzle (35) for injecting a cooling gas is arranged on an outer circumference of the extrusion nozzle (30).

A converging hole (18) communicating with the extruding nozzle is provided in the converging member.

An extrusion nozzle may have a height adjustment mechanism configured to adjust the height of an outlet in response to level deviations in the surface on which the construction material is extruded by the extrusion nozzle.

To provide a cannula device (4) with an implant (3), the cannula device (4) is held at an extrusion die in such a way that the cannula device (4) is in contact with a sealing surface of the extrusion die.

A heat exchanger and a converging member (17) connected each other axially are provided between the stabilizing and extruding member and the extruding nozzle.

The present invention also provides a method for manufacturing the hollow fiber membrane using the spinning nozzle.

The invention is characterised in that it uses an extrusion installation, in which the distance between the delivery opening of the extrusion nozzle and the surface of the cooled roll does not vary by more than +/- 50 µm during the operating time.

A flowable implant material is conveyed through the extrusion die into an implant channel (10) of the cannula device (4).

The force has a transverse component relative to the die axis (18), and performs work upon the extruded material (5), extra to the work that has already been performed to extrude it.

The extrusion nozzle (12) comprises a first annular nozzle opening (34) for producing an outer shell (62) and a second annular nozzle opening (40) for producing an inner shell (64).

To the second intermediate chamber (21) is connected the extrusion nozzle (3), which may have an annular gap (4) or a circular aperture, depending on the desired shape of a plastic blank to be produced.

Therefore, in the case that the impressions not stick to BuildTak will generally cause the extrusion nozzle is too far from the BuildTak sheet, so should proceed correctly leveled.

The closure elements (16a, 16b) are arranged at particular angles by extrusion opening angles (C, D, E, F, G and H) in order to increase burst strength.

If needed, additional plastic material is added in metered quantity to the extruded plastic hose at least in some regions in the direct vicinity of the mouth (52) of the extrusion die (5).