MACHINERY | SCREWS AND BARRELS
Right: Regular maintenance helps to ensure that screws last as long as possible
it can be refurbished or repaired – which is a cost-effective approach. Depending on the condi- tion, it is possible to rebuild flights, grind and polish a screw three or four times during its lifetime. However, if a screw is worn beyond a certain point, production problems become obvious: melted material moves backwards over the worn flights, for instance. If a throughput test shows a capacity reduction of 15%, the screw or barrel will have significant wear and need attention, he says. “Particularly in continuous production, it’s
important to keep machine screws and barrels well maintained,” said Becker. “This ensures consistent output, less downtime, less material waste and less stress on other machine parts. It’s not just about reducing energy consumption.”
gauges, can be fitted with extension rods to enable measurement along the barrel interior. Screws flights can be measured using a digital micrometer. “It’s advisable to clean both screw and barrel while still hot – using a wire brush to remove any remaining material – before cleaning further as it cools,” he said.
Once a specialist has inspected a screw or barrel,
Machine retrofit Germany-based Extruder Experts recently carried out another machine retrofit – which, it says, proves the benefit of repairing an existing machine rather than buying a new one. In this case, the retrofit involved the process section of an existing extrusion line. The conversion has resulted in several significant improvements.
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IMAGE: MESSE DUSSELDORF, CONSTANZE TILLMANN
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