MACHINERY | SCREWS AND BARRELS
Right: Davis- Standard is offering groove feed extruder retrofits to customers, helping them to realise
higher outputs
replace it before wear and tear has a great impact on each cycle.” Separately, the company has been carrying out tests to assess the endurance of both nickel and tungsten carbide barrel linings. Tests were carried out in a domestic laboratory to identify the loss by gas-entrained solid particle erosion on the linings, to simulate real production environments. To perform the tests, Milacron sliced 40in barrels in half and stripped each liner in 6in x 6in sections to get a flat 2in x 2in flat testing surface. Each liner was tested in six intervals (the length of one barrel) to get an average value of wear resistance. Milacron found a wide variance in how the lining behaved during the tests. There was a balance required in the amount of tungsten applied in the liner of the barrel. The wear resistance was measur- ably at a faster rate when testing liners with lower values of tungsten in the liner. “We did not expect to find that there is also a limit to the amount of tungsten that should be in the liner, as we found that too much tungsten would cause cracking during the process,” said the company. “We also found that the most expensive linings did not provide the most wear resistance in these tests.”
Its goal is to advise customers on the best investment for barrel lining in each application. The company plans to continue testing barrel linings from suppliers and comparing those results to its initial results. “Using data analytics collected through custom- ers with the M-Powered suite, we can continue to capitalise on this investment for our customers,” said the company. In feedscrews and barrels, Davis-Standard is offering groove feed extruder retrofits.
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This converts a Davis-Standard smooth
bore extruder into a groove feed model, allowing customers to realise higher outputs and lower melt temperatures, it says. Recently, the company converted a 3.5in (90mm) smooth bore into a 75mm groove feed using the existing drive train, extruder base and heating/cooling system. “This conversion took place at the customer’s facility over the space of a few days,” according to John Christiano, vice president of technology at Davis-Standard. The retrofit included a new spiral groove feed section and barrel assembly and a high-perfor- mance Davis-Standard barrier screw. The customer immediately saw results, with a 60% increase in output and 70F reduction in melt temperature. It also improved energy efficiency by 25%, said Davis-Standard. Equipment re-use – rather than replacement
– has proved to be eco-friendly and cost-effective, said the company.
CLICK ON THE LINKS FOR MORE INFORMATION: �
www.magog.co.uk �
www.glycon.com �
www.nordson.com �
www.polytechpipe.com �
www.davis-standard.com �
www.milacron.com
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