SHREDDERS | TECHNOLOGY
Shredders are no longer just size reduction machines, but now need to precisely cut plastics while providing high throughputs, reliability, flexibility within a robust construction. Mark Holmes reports
Shredding advances lead to greater precision
One of the initial phases of the plastics recycling process, shredding is essential because a reduction in size is required prior to washing and the second- ary sorting phase. “However, until recently shredding has been a considerably rough process,” says Giorgio Santella, Managing Director of CMG Granulators. “Size reduction – the commonly called process of shredding plastics – is no longer what the recycling industry is attempting to do. In fact, size reduction is a process that belongs in the past, linked to the objectives of waste management and volume reduction. Recycling is for valorisation of plastics at the end-of-life cycle, to be turned back into usable polymers. With such an objective in mind, shredding has progressed from crushing or shattering larger pieces of plastics into smaller parts to cutting large pieces of plastics into smaller pieces instead.” Santella continues: “With such an objective, shredders have evolved from multiple-shaft to
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single-shaft technology. In addition, single-shaft shredders have recently been provided with design features that allow precise cutting, homogeneous dimensions of shredded material and high energy efficiency. Two of the main technical developments that give modern shredders superior performance are blade design and improved controls. New blade design allows precise cutting – dimensional homogeneity without dust – while advanced controls allow self-adaptability for shredding the feedstock at the highest operational efficiency.” CMG Granulators adds that it is one of the few suppliers of recycling equipment producing both granulators and shredders. The company’s range of shredders covers small to medium capacity applications, from 200-1,500 kg/h. The TRM series has four models – TRM600, TRM900, TRM1200 and TRM1500 – all equipped with advanced blade design and intelligent PLC based controls. The
Main image: The 60/210 single-shaft shredder from Herbold Meckesheim
May/June 2022 | PLASTICS RECYCLING WORLD 13
IMAGE: HERBOLD MECKESHEIM
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