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Housing Liners Made of New Material to Protect Against Extruder Wear
Time: 2018-01-23
KraussMaffei Berstorff has found that higher demands on plastics products in terms of performance, environmental compatibility and price have a decisive influence on the compounds they are made from.
More and more of these compounds are fibre-reinforced, contain special additives like flame retardants, or come with high shares of fillers and reclaimed material to reduce costs. This in turn has effects on the processing machinery, so that wear protection is an issue of ever increasing importance for compounding companies.
KraussMaffei offers housing liners made of new material for its ZE BluePower twin-screw extruder series. The new 72HA material – an iron-based powder-metallurgical alloy with high shares of carbon and chrome – is manufactured using the HIP method. The chemical composition of this material ensures excellent wear protection against abrasion and corrosion and facilitates mechanical processing. This is why the new material offers optimum wear protection when it comes to applications with abrasive and corrosive stress, plus an extremely attractive price compared to the high-performance materials used so far.
The liners made of 72HA material are through-hardened. The company has introduced oval liners to provide optimised arrangement of the cooling and cartridge heater bores, which fit the ZE BluePower series using a large free volume at high torques. The slim liner shape enables an optimised arrangement of the cooling and cartridge heater bore for highly efficient temperature control of the housing elements. 
ZE 65 BluePower Twin-Screw Extruder with Optimized Wear Protection
In addition, the special geometry of the oval liners prevents liner deformation in the intermeshing zone. This improves the heat transfer from the external housing to the liner. A special contact collar ensures correct axial positioning of the liner inside the housing. For this reason, no leakage occurs at the housing connections of KraussMaffei Berstorff liner housings, which could be caused by different thermal expansion of liner and housing when the liners are not axially secured. With the new metallic material, the complex geometry of the completely through-hardened liners can be produced without any problem.
*All-Electric PX Series
KraussMaffei Group Mexico held an open house event to familiarise local processors with the all-electric PX series, surface decoration with dynamic mould heating (DMH), pipe extrusion, pultrusion of profiles, and dosing of polyurethane.
Visitors saw KraussMaffei’s whole repertoire of plastics processing in one day, from injection moulding to reaction process machinery and extrusion. In the Injection Molding area, the visitors experienced lots of technology for precision and manufacturing efficiency.
The all-electric PX series from KraussMaffei celebrated its premiere in Mexico and immediately met with great interest because of its flexibility and modular design. For projects with complex surface design, the dynamic mould heating of the cooperation partner Roctool offered interesting perspectives, because this process can achieve exciting effects and seamless surface aesthetics.
On an ELION 2200-1000, a classical Netstal application was demonstrated with cycle times of 4.5 seconds: Circular lids with a weight of 6.6 g of the material PRO-FAX SL872NW.The four-cavity mould was provided by the partner Stackteck. The demand for such projects with extremely short cycle times is currently growing in Mexico, so the In Mould Compression-Technology pursued by Netstal is also attractive. The new LRX small linear robot took over the time-saving handling.
Source: www.eppm.com