B - Operations – Transporting – 29 – C
Patent
B - Operations, Transporting
29
C
18/756
B29C 47/06 (2006.01) B29B 11/10 (2006.01) B29C 47/20 (2006.01) B29C 47/28 (2006.01)
Patent
CA 2008547
In the discontinuous manufacture of multilayer, co-extruded, hose-like thermoplastics material preforms used in the production of large volume multilayer hollow members in a divided blow mold, at least two different annular shaped material melts are brought together in series within an axially extending annular piston to form a multilayer material melt. An annular flow channel in the piston receives the layers of material melt. The flow channel widens in a funnel-like manner toward an annular storage space. The preform is subsequently ejected from the storage space through an annular nozzle gap by the annular piston moving in its axial direction. The annular piston acts as a co-extrusion head and is pressed upward by the multilayer material melts. In supplying the material melts from extruders into the flow channel of the piston, the material melts flow first in the extrusion direction and then are redirected for flow radially inwardly into the flow channel of the piston. By the redirection of the material melts in the transition from the extruder to the co-extruder or piston, no cross-sectional changes occur and weak points are eliminated or reduced to a point where they have no deleterious effect.
Fetherstonhaugh & Co.
Richter Gunter
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