B - Operations – Transporting – 29 – C
Patent
B - Operations, Transporting
29
C
B29C 47/12 (2006.01) B29C 47/06 (2006.01) B29C 47/28 (2006.01) B29C 47/70 (2006.01)
Patent
CA 2364156
The invention relates to an extrusion head for extruding a tube-shaped strand from at least one thermoplastic melt for producing blown films, containing an internal member and an external member, between which an annular space is formed, wherein the external member has at least one extrusion module with two extrusion members, which are arranged on top of each other, and wherein a separating gap, which terminates in the annular space, is formed between the extrusion members of each one of the extrusion modules, and wherein a channel system for distributing the plastic melt into the annular space is formed in each extrusion module, wherein the channel system comprises an inlet area, a branching area and a spiral area, each of which is located on a separate level, wherein the level of the inlet area is arranged between the level of the branching area and the level of the spiral area, and a group of first connecting channels leads from the inlet area into the branching area, and a group of second connecting channels leads from the branching area to the spiral area.
Reifenhauser Gmbh & Co. Maschinenfabrik
Robic
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