TECHNOLOGY | SHREDDERS
is not robust and reliable, all the subsequent production steps suffer. We run the Weima shredder continuously over three shifts. The result is ideal for subsequent washing, drying and extrusion. Precisely cut lengths and uniform pieces are very important to us.” The market for shredders continues to grow,
Above: Weima shredder with conveyor belts at Netherlands- based Healix
foreign objects during the shredding process and quick maintenance for short downtimes, as well as a wide variety of special options and tailor-made designs for demanding applications. Weima has recently been involved with Nether- lands-based company Healix, which is active in recycling fishing nets and ropes. The Healix recycling centre in Maastricht, the Netherlands was established in 2020 by CEO Marcel Alberts to address the problem of ghost nets – discarded, floating fishing nets and ropes polluting the world’s oceans. The company’s objective is to turn this waste into a product on-site. At the centre of the production line is a Weima W5.22 single-shaft shredder with hydraulic drive. The operation collects discarded and broken
Right: The 60/210
single-shaft shredder from Herbold Meckesheim
nets, ropes and cords from fishing and farming to recycle them. The waste plastic fibres, primarily PP and HDPE, are procured from national collection centres and used to create something new. The plastic waste includes fishing nets, packaging products such as big bags, ropes (particularly tear-resistant yarn) and other fibre-based materials from the agricultural industry. Healix’s aim is to transform 6,000 tpa of marine plastics into regranulate. Healix uses the Weima W5.22 single-shaft shredder with a working width of 2,200 mm for the first step of shredding. It is equipped with a powerful hydraulic drive from Hägglunds Bosch Rexroth, weighs just under 12 t, and provides good maintenance access that makes getting to the interior of the rotor easy. “It all starts with the shredder,” says Alberts. “If it
16 PLASTICS RECYCLING WORLD | May/June 2022
according to Herbold Meckesheim. “Modern washing plants for plastics in particular require sophisticated shredding technology to be able to process high throughputs and challenging feed materials,” says Achim Ebel, Vice-President Sales. “Flexibility in configuration is in demand and competition in this market segment is particularly fierce. The demanding processing requirements of post-consumer material requires adapted techno- logical solutions. Shredders are requested that can mill large quantities of plastics with a high degree of contamination and various mineral impurities, for example. At the same time, the machines should be largely wear-resistant and as simple as possible to operate and maintain.” He continues: “Heavily contaminated plastics
from the post-consumer sector also require specific shredder solutions. Integrated into modern washing plants, stage concepts are requested with technology adapted to different processing steps. A frequent request is high throughput capacity and low wear. In addition, there is a focus on energy efficiency and a need for different motor and transmission configurations – classic drives with gears, as well as belt drives or sometimes hydraulic drive systems.”
Ebel says: “Maximising the longevity of the machines is also important, even in heavy duty operations. For example, there needs to be high resistance to contaminants, long service life of cutting blades, and significant robustness to damage. This is achieved by good accessibility to all machine parts, especially the rotor, and easy replacement of wear parts, such as knives and plates. Efficient overload protection combined with short downtimes are also needed to meet today’s requirements.” Herbold Meckesheim cites a
IMAGE: HERBOLD MECKESHEIM
good example of a modern solution in washing plants as the single-shaft 60/210 shredder, which handles high throughputs and entire bales of plastics and is suitable for both dry and wet size reduction. The company
says that it combines a robust and
www.plasticsrecyclingworld.com
IMAGE: WEIMA
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