SCREWS AND BARRELS | MACHINERY
Wear measurement for screws and barrels – and making corrections depending on the results – helps to ensure that extruders work at optimum efficiency
Wearing out: latest in screws & barrels
Screws and barrels are critical to correct extruder functioning – but it’s sometimes forgotten that both are subject to wearing out. At K 2022, 3S – part of Erema – presented
innovations in wear measurement and screw production. It demonstrated how a new type of cylinder enables ultrasonic wear measurements – and a new screw manufacturing technology leads to more efficient production. The company is a specialist in the manufacture of extruder screws for plastics and recycling, and each year processes between 1,500 and 2,000 screw and cylinder orders. The company has developed a new type of cylinder that enables ultrasonic wear measurement of the extrusion screw and cylinder while the machine is running. “This saves the customer from having to shut down and restart the plant, remove and reinstall the parts, then clean and measure them – which would usually mean one to two days of machine down- time,” said Alois Anreiter, managing director at 3S. In another highlight, it showed a new screw
www.pipeandprofile.com
manufacturing technology. In a special machine, profile grinding can be used to shape materials that would be too hard for conventional production methods. This allows the geometry and outer diameter of screws and other components to be ground in one pass, without re-clamping. Further hardening treatment is no longer needed. When parts are removed from the machine, they are finished and through-hardened – with no final polishing required. The technology is being used to make discharge
screws for Laserfilter 406, an Erema filter system. “Extruder screws have up to 30 parts, each of which is manufactured individually,” said Anreiter. “We attach great importance to always being up to date in terms of our production technology.”
Austria plant Extreme Coatings, a US-based supplier of wear-resistant coatings, has a new manufacturing facility in Gmunden, Austria. The plant is for the production of high-perfor- mance coatings for feedscrews in extrusion and
March/April 2023 | PIPE & PROFILE EXTRUSION 21
Main image: Measuring wear on extruder parts such as screws is needed recommended once or twice per year
IMAGE: MESSE DÜSSELDORF, CONSTANZE TILLMANN
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