B - Operations – Transporting – 29 – C
Patent
B - Operations, Transporting
29
C
B29C 47/08 (2006.01) B29C 47/12 (2006.01) B29D 7/01 (2006.01) C08J 5/18 (2006.01)
Patent
CA 2740544
Spiral distributors for plastic melt are often used for manufacturing foils in blown film extrusion lines. They overlie several partial flows of melt on their way to the ring-shaped outlet nozzle. The spiral distributors are designed either as cylindrical or truncated cone-shaped axial spiral distributors or as plate-shaped radial spiral distributors. In an axial spiral distributor several spiral channels are disposed as a multiple screw. In the case of a radial spiral distributor, several spiral channels are disposed as multiple spirals. The invention proposes to provide the spiral channels with shortening sections in their backward area. As compared to a geometrical rule for a discontinuation of the spiral channels which is valid in a prior section of the spiral channels, this leads to a faster discontinuation of the spiral channels. The invention has observed that the design of the backward area of the spiral channels does not affect the good overlaying effect of the front part of the spiral channels. As compared to the customary embodiment, the channels are thus equipped with a less profiled backward end. This leads to a more cost-effective manufacture and to a lesser flow resistance.
Reifenhaeuser Gmbh & Co. Kg Maschinenfabrik
Sim & Mcburney
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