Extrusion nozzle with insert element

1 . An extrusion nozzle for an extrusion device for extruding plastic profiles, the extrusion nozzle comprising:

at least one nozzle plate which has at least one flow channel for plastic melt,

at least one insert element which is inserted into the at least one flow channel in order to reduce a cross-sectional area of the at least one flow channel through which the plastic melt can flow, and

at least one holding device is arranged inside the at least one flow channel and is provided in the at least one flow channel, on which the at least one insert element is arranged, wherein:

the at least one holding device forms a receptacle into which the at least one insert element can be inserted and the at least one insert element is held on the holding device along an extrusion direction along which the plastic melt can flow through the at least one flow channel; and

the at least one holding device forms at least one undercut including an overhanging portion by means of which:

the at least one insert element is positively fixed in a form fitting to the at least one holding device perpendicular to the extrusion direction along which the plastic melt can flow through the at least one flow channel; or

the at least one insert element is wedge-shaped or conical shaped along the extrusion direction along which the plastic melt can flow through the at least one flow channel so that the insert element is held in the holding device in the extrusion direction in a form-fitting and force-fitting manner.

2 . The extrusion nozzle according to claim 1 , wherein the cross-sectional area of the at least one flow channel through which the plastic melt can flow can be reduced transversely to the extrusion direction along which the plastic melt can flow through the at least one flow channel by means of the at least one insert element.

3 . The extrusion nozzle according to claim 1 , wherein the at least one insert element is detachably inserted into the at least one holding device.

4 . The extrusion nozzle according to claim 1 , wherein the at least one holding device is moulded onto a surface of the at least one flow channel along which the plastic melt can flow.

5 . The extrusion nozzle according to claim 1 , wherein the at least one holding device forms at least one undercut by means of which the at least one insert element is positively fixed to the at least one holding device perpendicular to the extrusion direction along which the plastic melt can flow through the at least one flow channel.

6 . The extrusion nozzle according to claim 1 , wherein said at least one holding device comprises two webs projecting from a surface of said at least one flow channel.

7 . The extrusion nozzle according to claim 6 , wherein the two webs extend obliquely to the extrusion direction along which the plastic melt can flow through the at least one flow channel.

8 . The extrusion nozzle according to claim 1 , wherein the at least one insert element is wedge-shaped along the extrusion direction along which the plastic melt can flow through the at least one flow channel.

9 . The extrusion nozzle according to claim 1 , wherein the at least one insert element comprises a base part for arrangement on the at least one holding device ( 3 ) and a head part for moulding the plastic melt.

10 . The extrusion nozzle according to claim 9 , wherein the base part is formed in cross-section as a symmetrical trapezium.

11 . The extrusion nozzle according to claim 9 , wherein the head part protrudes from the base part in a tongue-shaped or T-shaped cross-section.

12 . The extrusion nozzle according to claim 10 , wherein the head part protrudes from the base part in a tongue-shaped or T-shaped cross-section.