process feature | Materials recovery & granulators
series is the enlarged rotor diameter, which delivers a high throughput rate. Other features include a roller- driven material pusher, and integrated travel measur- ing system.
The machines are available with optional hydraulic
drive, which offers very high torque. It means that the machines can be driven by a smaller kW rated motor, saving considerable energy. A control pump is fitted as standard, enabling
rotational speed to be regulated step free in the same way as a frequency converter. Easy-to-shred material can be processed at high speed, with optimum through- put rates, while difficult material is shredded easily, albeit at a reduced speed. Originally developed for reprocessing tyres, the Tiger
Belgium’s Govaerts Recycling switched from DC to AC drives, which led to huge maintenance savings and quieter production
and received the CE certification required to make it available in Europe. The PRS is a two-stage system that first breaks
rock-like purgings into small pieces, then reduces the pieces to uniform regrind. A purging consists of the material that passes
through an extruder as the operator shifts from one job or colour to another. It is typically discharged onto the shop floor, after which it hardens, is then scraped up and disposed of – usually in a landfill. The enhanced design extends the use of PRS to
flexible vinyl, which stretches when worked by cutting blades and can jam conventional granulators. It can also be used with shear-sensitive polymers like polystyrene, which can melt as frictional heat builds up in standard equipment. The design improvements also allow reclaim of 85 Shore A vinyl, such as that used in wire and cable. “Since a 10lb [4.5kg] lump of hard plastic could
Maguire’s Purging Recovery
System can now handle
new materials such as flexible vinyl
damage the rotor of a conventional granulator, until now there have been limited options for reclaiming purgings,” said Pat Smith, Maguire’s vice president of marketing and sales. “Yet over time purgings add up to a waste of material valued at thousands of dollars per year.” PRS draws on the concept of the carpenter’s plane to
begin breaking the purging down. The design enhance- ments include adjustments to: the configuration of the eight rotor knives making up the plane; the clearances around the plane; and, the angle of attack between the purging and the plane.
Spider sense Weima Maschinenbau has extended its range of single shaft shredders with Spider 1000 and 2000 versions. The two new models, with rotors of 1000 and 2000mm, respectively, follow the original Spider 1500, which was launched at K2010. One of the most important features of the Spider
22 PIPE & PROFILE EXTRUSION | May/June 2012
www.pipeandprofile.com
single-shaft shredder from Pallmann has become a universal machine for many recycling applications, says the company.
It was designed to separate the rubber in tyres from
the steel reinforcement. Despite this, the grinding elements lasted longer than expected: the rotor blades had to be replaced after 8000 tonnes of material. Thanks to the lifetimes of the stator and rotor blades, adjustment of the cutting gap on a machine running at a typical recycling operation no longer needs to be carried out, says Pallmann. The blades can be changed quickly, using proven clamping technology, to reduce machine downtime. The unit’s patented construction enables the
direction of rotation of the rotor to be changed regularly. In this way, the blades keep themselves sharp, contrib- uting to a uniform product quality and further reduced maintenance.
The Tiger has been used in many applications beyond tyres, including size reduction of safety flooring.
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