| 摘要 |
An injection head (10) is described for a corrugator which is intended fo r the production of plastics pipes. The injection head (10) has a main head (12), a nozzle body (14) and a die ring device (16) with at least one die ri ng (32, 36). The main head (12) has been designed with first channels (50, 5 2) and the nozzle body (14) has been designed with second channels (58, 60), these having flow connection to the first channels (50, 52). The/each die r ing (32, 36) has a central body (74, 76) and, surrounding this, a sleeve bod y (78, 80). The central body (74, 76) has been designed, on its lateral surf ace (82, 84) facing towards the sleeve body (78, 80), with wound plastics di stributor grooves (86, 88) connected by means of connecting sections (114, 1 20) to a concentric annular groove (112, 116) which has been designed on the reverse surface (90, 92) of the central body (74, 76), and to which the two channels (58, 60) of the nozzle body (14) lead.
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