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

Claim 1

An extruder head to which three extruders are connected as a prerequisite for desired flowing together and satisfactory fusing of material mixtures controlled for producing a flat, cohesive profiled strip from resilient material mixtures having different compositions, said strip having a two-ply central portion, and two edge portions which are similar to one another; said extruder head comprising: a first extruder; a second extruder which is associated with said first extruder at an acute angle thereto; an extrusion nozzle; a preform die member which includes two flow channels disposed one above the other and respectively connected to one of said first and second extruders and to said nozzle so that material can be fed from said first and second extruders, via said flow channels, to said extrusion nozzle for said central portion of said profiled strip; and also a third extruder connected to said preform die member, which further includes, starting from the point of connection of said third extruder thereto, a single connecting channel which leads to that portion of said preform die member in which said flow channels are disposed one above the other; in this last-mentioned portion of said preform die member, said connecting channel being split into two branch channels which span said flow channels, are essentially of the same length, and respectively end in an edge channel, both of which are connected to said extrusion nozzle so that material can be fed from said third extruder, via said single connecting channel, said branch channels, and said edge channels of said preform die member, to said extrusion nozzle for said edge portions of said profiled strip.