Patent ID: 6045347
Filing Date: 2000-04-04
Classification: B29C,B29L

Abstract:
An apparatus for the production of plastic compound pipes, in which half shells are disposed to circulate in a direction of production, completing each other in pairs to form a mold on a molding path, a pipe head of an extruder being disposed upstream of the molding path in the direction of production, comprisinga central longitudinal axis;a connecting piece of the extruder;a supporting ring;a first adjusting device, by means of which the connecting piece and the supporting ring are tightly joined to each other in the direction of said axis, and said first adjusting device being able to adjust the supporting ring relative to the connecting piece radially to said axis, said first adjusting device has a first adjusting ring provided with an annular collar which overlaps an annular flange of the connecting piece and wherein the first adjusting ring is joined to the supporting ring;an internal mandrel mounted on the supporting ring;an external mandrel mounted on the supporting ring and surrounding the internal mandrel;an external nozzle jacket surrounding the external mandrel;a second adjusting device, by means of which the external nozzle jacket and the supporting ring are tightly joined to each other in the direction of said axis, said second adjusting device being able to adjust the external nozzle jacket relative to the supporting ring radially to said axis, said second adjusting device has a second adjusting ring provided with an annular collar which overlaps an annular flange of the external nozzle jacket and wherein the second adjusting ring is joined to the supporting ring;an annular injection channel formed between the connecting piece and the supporting ring and connected with the extruder;an internal channel which discharges from the injection channel and which is led through the supporting ring in the direction of production, and which is subsequently defined between the internal mandrel and the external mandrel and terminates in an internal nozzle; andan external channel which discharges from the injection channel and which is led through the supporting ring in the direction of production, and which is subsequently defined between the external mandrel and the external nozzle jacket and terminates in an external nozzle.