EOW March 2014

News Technology

What makes a crosshead a good crosshead?

that the extruder and crosshead are less stressed. As producers need high flexibility in their use of materials, Rosendahl has made it possible to process different materials, from HFFR to PA or PUR, all on one crosshead. The modular construction can easily be changed from a fix centred to a manually centred crosshead. The Rosendahl Crosshead Series RX includes crossheads for extruding cables with a core diameter from 0.03mm to 180mm. All crossheads are offered as single machines and also in complete lines. Rosendahl Maschinen GmbH – Austria Website : www.rosendahlaustria.com

A cable producer’s main goal is to offer a high quality product to the market. A high quality cable is the result of many different factors. One of them is the extrusion crosshead. What makes a crosshead a good crosshead? High centricity, for example. Rosendahl focuses on a round crosshead body, where the crosshead is heated up with external heating bands. This ensures consistent heat distribution. High centricity is also achieved through simulation in order to optimise the distribution of the material flow. Moreover, the simulation makes it possible to control a minimum shear rate and a minimum shear stress. Through a special distributor design the company also achieves high quality welded seams. The extruded product has sufficient relaxation and homogenisation zones as well. A small volume in the distributor enables short dwell periods and quick colour changes. For product handling purposes Rosendahl has ensured that maintenance is kept simple through using heating bands,

▲ ▲ Crosshead RX 110

which are easier to change than heating cartridges. To reduce operating costs, it reduces pressure on the crosshead distributor, which enables gentle processing of the material and gives the additional benefit

Cold forging steel ML20MnTiB Jiexiu Xintai Steel Limited (Xintai Steel) has developed and launched a new cold forging steel, ML20MnTiB. Xintai Steel has worked hard on developing new products since the successful launch of its Q345E steel, now producing Q195LD stabilising steel for grade 4.8 bolts. Jiexiu Xintai Steel Limited (Xintai Steel) – China Website : www.xtsteel.com

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March 2014