The choice of the right cutting system, or rather the interaction of rotor and stator knives and speed, also decisively influence particle quality. Here, it is particularly important to avoid fines in the material flow because they negatively affect downstream processes and can lead to blockages in cleaning components or the fine screens of extruders, for instance. Lindner has addressed this problem by turning its Mono-Fix technology into a smart system with modules that make it possible to replace the cutting system in the event of wear and allows for the use of different or mixed rotor configurations. The mixed cutting systems allow for shredding of heavy materials while minimizing lumps and purgings. Different pointed and flat knives are available for changeouts with one screw, as well as cover plates and counter knives that can be fixed to the same rotor body. Custom software set-ups are available to tailor machine control and frequency converter parameters for specific applications.
Different pointed and flat knives are available, as well as cover plates and special counter knives that can be fixed to the same rotor body. This extended range now makes it possible not only to replace the cutting system completely in the event of wear and tear, but also to use different or mixed rotor configurations. Mixed cutting systems can avoid common problems caused by difficult materials, such as massive lumps and purgings because pointed knives would otherwise mill into the plastic, causing throughput to drop sharply. Combining the two systems produces particles that are precisely cut by the pointed knives, and the flat knives cut loose any milled-in material. Using special filler plates, the aggressiveness of the cutting unit can also be adjusted so that it is possible to shred heavy materials at corresponding throughputs even at low drive power. In addition to the flexible rotor configurations, customized software set-ups make it possible to tailor relevant machine control and frequency converter parameters to the respective application.
The flexible cutting system was created in cooperation with the Austrian plastics recycler Candi Plastic Recycling GmbH, which is already successfully using it. At the headquarters of the family owned business, about 3,000 metric tons of thermoplastics such as PE, PP, PS and ABS are turned into homogenous regranulate every year. The materials, which are processed south of the Austrian metropolis of Vienna, as well as at their subsidiary Calex in Baia Mare, Romania, mostly come directly from international big players in packaging and brand product manufacturing