machinery feature | Pelletizing systems
ground up. This has led to an improved cutting geometry with an optimized arrangement of the cutting rotor, feed-rolls and bed knife relative to each other, as well as a new concept for cleaning, changeover and maintenance. The unguided length of the strands between the
feed-rolls and the cutting edge has been reduced, so strands arrive more evenly and straighter at the cutting rotor. Pellet quality, especially when processing very soft, elastic materials, is said to be much higher. The amount of fines when cutting brittle materials is also reduced. The feed roll units are lighter than before – the
Reduction Engineering Scheer has launched a new version of its 3500 Series strand pelletizers
equipment [produced by Brazilian affiliate, Rotoline]. It works very well.”
The German arm of Reduction Engineering Scheer has added a new series of strand pelletizers for small and medium throughputs. The SGS-L10 units, which have two-sided support, are available in four sizes with working widths from 100 to 400 mm and throughputs of up to 4 tonnes/hour. They complement the company’s well-established SGS-L pelletizers. The new machines are more compact, and are designed to allow faster product changes and the replacement of wear parts with reduced manpower. In addition, a completely new cutting geometry has been developed to improve pellet quality, especially when processing very soft, elastic or brittle materials. The new units were developed to meet the typical demands of processing small and medium lots with a big variety of different polymers and formulations. The reduction of downtime was one of the main priorities, the company says. As a result, the mechanics for guiding the strand through the machine were completely re-designed from
upper feed roll 15% less and the lower feed roll 60% less – so dismantling can easily be done by one person, without lifting equipment. Thanks to these and other design improvements, the
downtime for product changes or the exchange of wear parts can be reduced by 30 to 40%, the company claims. Sound-proofing has also been improved: noise level is less than 85 dB(A), which is around 5 dB(A) lower than on the SGS-L series. The machine’s footprint is smaller too. Despite major revisions on the pelletizer design, exist-
ing spare parts such as the bed knife and the cutting knife segments fit on the new SGS-L10. Models are available in working widths of 100, 200, 300 and 400 mm.
Safer handling of blades Pelletizing systems produced by Reduction Engineering Scheer in Germany also include SGS-E units with a cantilevered design. Sly says the design has been embraced by compounders and colour compounders with smaller line rates, because it can be cleaned quickly. But there is a concern when installing a freshly sharpened rotor: remounting normally requires the operator to use cut-resistant gloves and special arm bands, since the blades are obviously extremely sharp.
Reduction Engineering Scheer’s SGS-L10 has lighter feed roll units for easy dismantling by one person (left), while the company’s new rotor change-out device is designed to improve operator safety (right)
42 COMPOUNDING WORLD | January 2015
www.compoundingworld.com
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