RECYCLING AND GRANULATORS | MACHINERY
As environmental restrictions get tougher – to say nothing of the need to reduce resin costs – internal recovery of scrap material is becoming ever more important in extrusion
Making more of materials
Although recycling now stands as an industry on its own – which has grown to deal with the need to deal with waste plastics – there is still a need for ‘internal’ recycling of waste within plastics process- ing operations. This helps to use materials as efficiently as possible, and minimise waste in the production process. Pure Loop – part of Austria’s Erema Group
– recently developed a shredder-extruder combina- tion that has been used to produce recycled pellets during the production of irrigation pipes. Manufacturers with this kind of system in place
are reusing up to 20% of production waste without any loss of quality, compared to production from pure virgin material. “This level of reuse can be significantly increased
thanks to the high quality of the recycled pellets,” said Manfred Dobersberger, managing director of Pure Loop. “The high demands on the recycling process result from the high volume of the bulky input material as well as the material composition.” As well as being used for irrigation pipes, the method also works with drip tapes – another key
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product used in agriculture. To test whether irrigation pipes meet the strict quality standards – of a maximum of two pinholes per 10 kilometres – one customer pressure-tests them with water. “The proportion of foreign polymers in this
material is a real challenge in recycling, but one that our combination of ISEC Evo shredder-extrud- er combination – with double degassing – and Erema laser filter can handle,” said Dobersberger. In the laser filter, three scrapers remove contami-
nants, which mainly consist of silicone. The filter’s high efficiency enables high throughput rates in the recycling process and high quality of the recycled pellets, said the company. The recycling machine can process bulky hose bundles as well as other production waste such as start-up lumps and regrind material or complete rolls with drip tapes. Single-shaft shredders and double feed ram systems flexibly adapt to individu- al logistic requirements and – thanks to the conical transition to the extruder – the material is compact- ed and oxygen is reduced, so that the plastic is
April 2021 | PIPE & PROFILE EXTRUSION 13
Main image: Pure Loop has devised a shredder-ex- truder combi- nation to make recycled
pellets during the production of irrigation pipes
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