TWIN SCREW EXTRUDERS | MACHINERY
Main image: The co-rotating twin screw extruder has been with us for more than 50 years but development continues as equipment makers target easier operation and improved performance
Improving the breed
Today’s co-rotating twin screw extruders are the result of more than half a century of development and progress continues to this
day.Peter Mapleston reviews the latest introductions
The co-rotating twin screw extruder has been with us now for around 60 years, as evidenced by anniversary announcements last year from Coperion and Leistritz (the former saying it delivered its first example in 1957 and the latter adding the technol- ogy to its standard extruder product line a couple of years later). But the technology has been far from static since then and all suppliers of co-rotating twin-screw compounding extruders continue to make improvements to their equipment. As might be expected for a mature technology, development is more evolutionary than revolution- ary. However, the improvements are real and range from filling gaps in current product lines to expand- ing into new production territories. Either way, they
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promise to make operation easier and more cost-effective for users. CPM Extrusion Group’s new CXE 45 sHO will get its first public outing at NPE 2018 in Florida in the US in May. The company says the machine, with 45mm OD screws, “fits perfectly” between existing machines with 26mm and 50mm ODs. Developed by group company Extricom Extrusion (acquired by CPM at the beginning of last year) it is targeted at producers of compounds and masterbatches. A broad variety of optional “smart” features are now also being offered as an extension to the existing HO variants in the CXE machine series (HO stands for High Output with the machines offering a torque density of 18 Nm/cm³ and screw speed of
March 2018 | COMPOUNDING WORLD 19
PHOTO: COPERION
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