Injection head for a corrugator for the production of plastics pipes

An injection head is described for a corrugator which is intended for the production of plastics pipes. The injection head has a main head, a nozzle body and a mouthpiece means with at least one mouthpiece. The main head is embodied with first channels and the nozzle body is embodied with second channels which are flow-connected to the first channels. The/each mouthpiece has a central body and a sleeve body, surrounding said central body. On its lateral surface facing the sleeve body, the central body is embodied with wound plastics distributor grooves which are flow-connected by means of connecting portions to a concentric annular groove which is formed on the reverse surface of the central body and into which the second channels of the nozzle body discharge.