Extruder head for producing flat cohesive profiled webs from resilient mixtures of differing composition

摘要

An extruder head for producing flat cohesive profiled strips from resilient mixtures of differing composition, such as mixtures of rubber or synthetic material, and especially for manufacturing uncured tread strips for pneumatic tires having a two-ply central portion and two similar edge portions. The extruder head includes two extruders which are disposed at an acute angle next to or above one another, and feed a common extrusion nozzle via a preform die or member having flow channel which extend one above the other. The extruder head also has a third extruder which conveys the mixture for the edge portions and is connected to the preform die at a greater angle than are the aforementioned extruders. The flow route of the third extruder in the preform die, starting from its connecting bore, is initially guided as a single connecting channel to a direction-changing angle piece in the central region above or below the flow channels associated with the other two extruders, and from there is split into two branch channels which span the connecting channels, are essentially of equal length, and in their edge regions end in edge channels which lead into the edge portions of the profiled strip.