SIZE REDUCTION | TECHNOLOGY
an extraneous material detection system with a motor or rotor brake. Together with start-up and reversing controller from the HiTorc drive, 2-2.5 times torque can be achieved for a short time with this combination. A worm conveyor
transports the output material from the machine to a drag chain conveyor, which moves it up to the next floor, where Vecoplan installed a magnetic separator for removal of ferrous materials. Following this, all non-ferrous metals are removed. Convey- ers then take the film flakes to a film silo. This material is placed into
temporary storage because the throughput of the shredder is higher than that of the two extruders. In this way it is possible to bridge waiting times which can arise when an employee has to replace cutting tips or remove extraneous material. The extruders are therefore able to continue running and avoid production downtime with its attendant costs. Weima has introduced two large single-shaft
shredders, which can be used either as a stand- alone solution or as part of a production line. The WKS 1800 and WLK 1500 shred not only bulky objects, but also tear-resistant fibres and film to a homogeneous size. The two new shredders were displayed for visitors to Weima’s stand at the K2019 show in October. The company says that in order to have suffi- cient power reserves to handle even a full hopper of difficult material, the WKS 1800 single-shaft shredder is equipped with a sturdy hydraulic drive. Stopping, starting and reversing the rotor is possible at any time, even under the toughest conditions. Its simple structure and fast reactions make it resistant to practically any kind of impurity. Instead of a horizontal ram, Weima says that the WKS Series has a swing ram system that is guided on rolls. That makes the shredder compact and allows a more aggressive material infeed. Together with a large inspection flap, the machine is easy to service and maintain at all times, including knife changing. Due to a particularly low feeding point at a height of around 2.2m, the WKS can be easily charged by conveyor belt, forklift truck or by hand. The rotor diameter is around 500mm. The WLK Series single-shaft shredders have the
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modified Weima WAP gearbox. It can be equipped with a safety clutch, while sensors monitor the belt pulleys. The drive system is protected from damage caused by foreign material and before any major damage occurs, the shredder will stop automatically. Clogging is prevented by the segmented floor guide and the precise guidance of the ram that presses the material to be shredded against the rotating rotor.
The hydraulically lowered swivel screen basket installed as standard improves accessibility and thus simplifies maintenance work.
Furthermore, all WLK shredders have a pipe-spac- er hopper that prevents material bridging, which is an important aspect when, for example, shred- ding large purgings. The WLK Series shredders can be fitted with either the universal V-rotor or the F-rotor developed specially for film and fibres. In addition, a vautid wear protection coating is available as an option for particularly abrasive materials. Both rotor variants have a diameter of approximately 370mm.
CLICK ON THE LINKS FOR MORE INFORMATION: �
www.untha.co.uk �
www.rapidgranulator.com �
www.lindner.com �
www.recyclate.de �
www.vecoplan.com �
www.rkw-group.com �
www.weima.com
Right: The Weima WKS 1800 single- shaft shredder
Below:
Plastics to be processed at RKW includes loose film
May/June 2020 | PLASTICS RECYCLING WORLD 23
IMAGE: WEIMA
IMAGE: VECOPLAN 2
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