| 摘要 |
An apparatus for producing seamless plastic tubes comprises an injection head to which molten plastic material is fed by an extrusion device. The injection head has a plate-shaped distribution device 13 a , 13 b having an intake opening 20 into which the feed passage 17 a , 17 b for the molten plastic material opens. In the distribution device, distribution passages 14 extend in a star configuration from the intake opening 20 and extend perpendicularly to the axis of the injection head, wherein each distribution passage 14 has a straight radial passage portion 14 r and three branch passages 14 z which branch therefrom and which each go into arcuate passage portions 14 k which, in the region of the periphery of the distribution device, communicate with the annular gap 25 of the injection head, with the adjacent ends at a respectively identical angular spacing, and they each introduce a respectively identical volume flow into the annular gap 25.
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