Extruder die head

Details Extruder die head Extruder die head

B - Operations, Transporting

29

C

B29C 47/12 (2006.01)

Patent

CA 2330928

An extruder die head, preferably a blown film head, comprises an internal cylindrical mandrel and a concentric jacket. Between the mandrel and jacket an annular channel is formed that empties into a die slit. The die head also includes at least one polymer melt feed line in communication with the annular channel remote from the die slit. To prevent a gap appearing between the central mandrel and the jacket as a result of differential thermal expansion, in which polymer melt can become trapped and degrade, thus causing defects in the extrusion, the joint faces between the parts of the die head are located radially relative to the cylinder axis of the die head.

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