B - Operations – Transporting – 29 – C
Patent
B - Operations, Transporting
29
C
18/751
B29C 49/00 (2006.01) B29C 47/06 (2006.01) B29C 49/22 (2006.01)
Patent
CA 1166415
ABSTRACT OF THE DISCLOSURE The invention provides a die assembly comprising a nozzle and at least one mandrel which defines with the nozzle an annular die orifice. The nozzle has a longitudinally extending stem ter- minating in the sleeve, the mandrel being located coaxially within the sleeve and coupled to the stem of the nozzle by an axially extending screw threaded coupling. The mandrel includes an internal flow passage having an inlet positioned to receive thermoplastic material from a supply passage extending along the nozzle and an outlet positioned to deliver the material to an annular distribution chamber defined by the opposing surfaces of the mandrel and the sleeve. The distribution chamber provides an uninterrupted annular flow path extending from the outlet to the die orifice, thereby avoiding the disadvantage of imperfect material distribution. For the production of multiple-walled tubing, a plurality of die stages coupled together in coaxial relationships are provided, the die components being so coupled by axially extending screw threaded couplings so positioned as not to interfere with the flow of plastic materials.
384407
Lupke Gerd P.h.
Lupke Manfred A.a.
Lupke Gerd P.h.
Lupke Manfred A. A.
Na
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