drying | Materials preparation Right: The
energy-effi- cient Somos
RDT and RDM resin dryers
developed by ProTec
Polymer Processing
independently. The airflow is modulated automatically by the drying unit, resulting in optimum process operating conditions. This way, a medium capacity Genesys system (drying 200-250 kg/h of polymer) provides sav- ings of as much as 50% with respect to a traditional drying systems of equivalent capacity, says the company. Piovan adds that Genesys is capable of
calculating exactly how much material is used by the processing machine (or machines) and adjusts the operating parameters accordingly. In addition to maintaining a constant dew point, Genesys adjusts the airflow to the quantity of material effectively used, regulating the thermal load for each kilogramme of polymer processed. The Genesys control system is provided with an algorithm which varies the quantity of air supplied to the hopper, circulating the air content required to keep the thermal load constant. Maximum operating efficiency is achieved when the entire thermal energy in the process air is transferred to the material. The air returning from the hopper to the dryer therefore does not require cooling water in order to ensure system operation and absorption by the aluminium silicate molecular sieves. ProTec Polymer Processing has introduced
energy-efficient Somos RDT and RDM resin dryers. The Somos RDT-250 stationary resin dryer is for medium capacity material throughputs, while the Somos RDM-140/400 auxiliary dryer increases the maximum material throughput capacity of the RDM mobile dryer series.
The Somos RDT-250 stationary dry air dryer can
handle a material throughput of up to 200 kg/h with an effective dry air throughput of 140-300 m³/h. The dry air generator and the drying bin are also of a new design. The drying bins, which are square on the outside and cylindrical on the inside, can be fitted together to form a compact modular drying system comprising of up to six bins in graduated sizes with effective volumes ranging from 50-300 litres. In order to ensure energy efficiency, the company says that RDT dryers are equipped with energy-saving technology which automatically responds to changes in ongoing operation. Drying air throughput is automati- cally adapted to a module’s current material throughput while desiccant bed regeneration is adapted to the actual moisture loading of the adsorbent. The dry air generator is a multi-chamber system with three desiccant bins, which ensures a consistently low drying air dew point of -35°C, so resulting in uniformly good drying results. As standard, the RDT stationary drying
46 INJECTION WORLD | March/April 2017
system is designed for drying temperatures of 60-140°C while a high-temperature version for up to 180°C is also available. Further options include a condensate separator for critical and contaminated polymers as well as a dew point sensor. ProTec adds that the Somos RDM-140/400 dryer
completes its series of energy-efficient mobile dry air dryers. The RDM series is the new generation of dryers previously known as the T/TFeco series. These dryers are designed for drying medium capacity throughputs of flowable, hygroscopic polymer pellets and regrind. With an effective volume of 400 litres, the new dryer
can achieve a throughput of up to 150 kg/h depending on material, some 30% more than the previously largest RDM-100/300 auxiliary dryer with its volume of 300 litres. Drying bins with an effective volume of 30-400 litres are available in six graduated sizes. The dry air throughput of 10-140 m³/h is adapted to the particular bin size. Located right by the processing machine, RDM
dryers flexibly pre-process a volume of material suited to the machine’s throughput. Drying temperatures of 60-140°C at a drying air dew point temperature of -35°C are standard while a high-temperature version is also available for drying temperatures of up to 180°C.
Click on the links for more information: ❙
www.conairgroup.com ❙
www.maguire.com ❙
www.simar-int.com ❙
www.dri-air.com ❙
www.motan-colortronic.com ❙
www.piovan.com ❙
www.sp-protec.com
www.injectionworld.com
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