Patent ID: 8043082
Filing Date: 2011-10-25
Classification: B29C,B29L

Abstract:
1. An injection head for a corrugator for the production of plastics pipes, with a main head having at least one connection for a plastics extruder, with a nozzle body which is attached to the main head so as to be in axial alignment and with at least one mouthpiece which is attached to the nozzle body so as to be in axial alignment and has an output annular slot for the corresponding plastics material, the at least one mouthpiece having a central body and a sleeve body surrounding said central body which determine the associated output annular slot, the central body of the at least one mouthpiece having a lateral surface facing the respective sleeve body with wound plastics distributor grooves distributed uniformly in the circumferential direction, characterized in that the main head is embodied with axially oriented first channels which are distributed uniformly in the circumferential direction for the at least one plastics material, in that the nozzle body is embodied with axially oriented second channels which are distributed uniformly in the circumferential direction and are flow-connected to the first channels, in that the respective distributor groove is flow-connected by means of connecting portions to an annular groove which is formed on the reverse surface ( 90 , 92 ) of the central body and into which the second channels discharge, and in that the first channels are provided set uniformly apart from one another on a common pitch circle and alternate in association with the respective connection.