Extruder die head

Details Extruder die head Extruder die head

B - Operations, Transporting

29

C

B29C 47/12 (2006.01) B29C 47/08 (2006.01) B29C 47/20 (2006.01)

Patent

CA 2330516

An extruder die head, such as a blown film head, comprises an internal cylindrical mandrel and an outer concentric jacket enveloping the mandrel to provide an annular channel that communicates with a die slit. To avoid slit-like gaps between the mandrel and the jacket, where polymer melt can accumulate and degrade resulting in flaws in the extruded polymer, the mandrel has an integral outwardly extending flange-like foot. At least one supply line for molten polymer, such as a set of boreholes communicating with helical grooves in the outer cylindrical face of the mandrel, is connected to the annular channel in the area adjacent the flange-like foot. A ring is shrunk onto the mandrel against the foot, at a predetermined tension to seal the slit between the mandrel and the jacket, and avoid the effects of differential thermal expansion. The cylindrical jacket is mounted sealingly onto the ring.

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