Vorrichtung zur Herstellung von Kunststoffrohren

摘要

The invention relates to a device for producing seamless plastic pipes, comprising an extrusion head to which plastic melt is fed by an extrusion device. Said extrusion head has a plate-shaped distributor device (13a, 13b) with an inlet opening (20) which leads to the feed channel (17a, 17b) of the plastic melt. Runners (14) extend radially in the distributor device from the inlet opening (20) and are disposed at a right angle to the axis of the extrusion head. Every runner (14) has a straight radial channel section (14r) and three branching channels (14z) branching off therefrom and blending into arcuate channel sections (14k) that flow into the annular gap (25) of the extrusion head in the zone of the periphery of the distributor device at equal angular distances of neighboring ends and that feed equal volume flows to the annular gap (25). The plate-shaped distributor device with the radial arrangement of the runners (14) allows for a simple and compact constructive design of the extrusion head and can be produced at low production costs while guaranteeing a high homogeneity of the plastic melt flow discharged from the annular gap of the extrusion head.