The Cincinnati Extrusion KryoSys system for forced cooling of pipes has been instrumental in the specification of a pipe extrusion line by Polish producer KNG Awans.
KryoSys combines external water cooling with internal air cooling — which has an energy-saving application in that the removed heat is used to pre-heat the material in the hopper. An Iris spiral mandrel die modified for increased heat removal (pictured) is also fitted.
KNG Awans makes water, sewage and pressure pipes from PE 100, PE 80 and PVC. It had planned to expand its production capacity, but the limited length of its production hall had presented serious problems.
CET says the KryoSys package can reduce the line length for a given output by 54% and achieve typical savings of 166 kW.
The line which has been ordered by KNG Awans will produce HDPE 3 layer pipes with a thin outer homopolymer PP layer in diameters from 90 to 630 mm with a layer distribution of 25% / 50% / 25%, and will be around half the length needed for a conventional line. It will consist of two monos+ 60 single-screw extruders for the two HDPE layers and a talos 45 as co-extruder for the thin outer PP-H layer. The pipe head will be a KryoS 63-1200 3-Coex.
The monos+ series has a feed zone with grooved feed bushing, screw geometries optimised for PP and PE and PFT power feed technology. Monos+ extruders are equipped with temperature regulation controlled by proportional magnetic valve technology in the feed zone as standard.
Talos single screw extruders have direct drives with constant output for silent run and resistance to wear. They also have a compact design cutting floor space requirement. Both extruder types have maintenance-free AC motors with frequency converters. In addition to low-noise operation, these asynchronous motors have low energy consumption under partial load.
The line will be installed at KNG Awans’ premises in Czarnków, Poland, in the second half of 2010.
