machinery | Wear protection
“Other issues include a trend towards the use of higher loadings of abrasive fillers, for example 75-85% CaCO3
,
as well as increased post-consumer and post-industrial recycle content, potentially adding contamination, such as metals, and increased moisture that can lead to corrosion,” he says. Growing use of natural fibres and fillers also places
Above: ZE BluePower wear resistant alloy liners are designed to deliver performance at optimal cost
The company says the new material has been
developed with the complex geometry of the extruder in mind. Liners of the ZE BluePower series extruders feature an elliptical shape to provide a large free volume at high torque and a slim design to allow an optimised arrangement of cooling and cartridge heater bores for highly efficient temperature control. In addition, the geometry is said to prevent deformation in the intermeshing zone, which improves heat transfer from external housing to liner, while a special contact collar ensures correct axial positioning. The latter feature ensures no leakage occurs due to differential thermal expansion of liner and housing. “With the new metallic material, the complex geometry of the completely through-hardened liners can be produced without any problem. We are convinced that this is a unique and uncompromising alternative when it comes to wear protection,” says Madle. According to Adam Dreiblatt, Director of Process
Technology at CPM Century Extrusion, compounding extruders are today operating at higher screw speeds, higher torques and higher output, which subjects extruder components to greater mechanical stresses.
greater demands on the compounding extruder, Dreiblatt claims. “Increased use of natural fibres, fillers and biopolymers adds more than trace amounts of moisture to the process. At elevated temperatures, this can lead to corrosive wear,” he says. “In addition, the incorporation of flame retardants in high melt tempera- ture polymers require massive corrosion and abrasion resistance. Compounders need a good understanding of the process requirements and how to match these with a clever screw design and element geometry. Both have a great impact on wear as it can be supporting or preventing and reducing it.” Dreiblatt says it is important that wear is taken
seriously to avoid both poor quality production and high repair bills. “Some compounders avoid replacing worn components to save cost. However, operating machines with severe wear can lead to further mechanical damage, for example gearbox failure in a worst case scenario,” he says. CPM Extrusion Group has developed customised and
process-specific material combinations for screw and barrel wear protection, all of which are based on analysis of the process conditions. “This includes crest welded/hipped elements and cladded/hipped barrels in high performance materials,” says Thomas Bauer, Sales Director at Germany-based Extricom Extrusion,
DON’T MISS THESE ISSUES OF
http://content.yudu.com/web/1rl19/0A1rl2p/CWMay17/html/index.html
https://content.yudu.com/web/1rl19/0A1rl2p/CWJun17/index.html
CLICK ON THE COVERS TO VIEW
PHOTO: KRAUSSMAFFEI BERSTORFF
JUNE – KNEADER EXTRUDERS
MAY – WIRE AND CABLE
Page 1 |
Page 2 |
Page 3 |
Page 4 |
Page 5 |
Page 6 |
Page 7 |
Page 8 |
Page 9 |
Page 10 |
Page 11 |
Page 12 |
Page 13 |
Page 14 |
Page 15 |
Page 16 |
Page 17 |
Page 18 |
Page 19 |
Page 20 |
Page 21 |
Page 22 |
Page 23 |
Page 24 |
Page 25 |
Page 26 |
Page 27 |
Page 28 |
Page 29 |
Page 30 |
Page 31 |
Page 32 |
Page 33 |
Page 34 |
Page 35 |
Page 36 |
Page 37 |
Page 38 |
Page 39 |
Page 40 |
Page 41 |
Page 42 |
Page 43 |
Page 44 |
Page 45 |
Page 46 |
Page 47 |
Page 48 |
Page 49 |
Page 50 |
Page 51 |
Page 52 |
Page 53 |
Page 54 |
Page 55 |
Page 56 |
Page 57 |
Page 58 |
Page 59 |
Page 60 |
Page 61 |
Page 62 |
Page 63 |
Page 64 |
Page 65 |
Page 66 |
Page 67 |
Page 68 |
Page 69 |
Page 70 |
Page 71 |
Page 72 |
Page 73 |
Page 74 |
Page 75 |
Page 76 |
Page 77 |
Page 78 |
Page 79 |
Page 80 |
Page 81 |
Page 82 |
Page 83 |
Page 84 |
Page 85 |
Page 86
