Patent ID: 8523552

Claim:
A device for extruding plastic profiles, preferably plastic pipes, to which plasticated plastic compound can be fed and which has a number of annular channels which are brought together by means of a flow converging location to form a joint melt channel, the die is divided into three functional regions, the three functional regions comprising a distributing region, a cooling region and a shaping region, the annular channels being arranged in a concentric configuration in the distributing region and the cooling region with the die being configured with material mass of the die located between the annular channels being to the greatest extent the same, such that there is similar heat conduction between the individual annular channels, the annular channels in the distributing region including protrusions which decrease in height in the downstream direction until smoothing out at the start of the cooling region, cooling channels running axially by the protrusions in the distributing region and being arranged around and between the annular channels in the cooling region in a manner to extract heat from the mass of the die generally uniformly, for providing relatively uniform cooling on the plastic compound.