Drying | materials preparation
chamber and is set at a specific dew-point between -30°C and +5°C). It requires that the amount of moisture in the process return air is higher than the set dew- point, which is normally the case under atmospheric conditions in this range. The company says the ATTN system can be used with single and multi-bin systems and can also be used in combination with Motan-Color- tronic’s ETA plus system for controlling air volume and drying temperature.
US ancillary equipment maker Conair claims its
MicroWheel dryers are among the most compact desiccant wheel dryers on the market. Designed for mounting directly on the machine feed throat, the units offer an alternative to compressed air and small twin- tower units or the company’s own large Carousel Plus wheel dryer for moulders processing small quantities. The new dryers are offered in two base variants: The
MW1 supports hopper volumes from 5.7-28.5 litres capacity and ranges in height from 495mm to 704mm; the larger MW2 is available with hopper capacities from 28.5-42.5 litres and measures between 704mm and 978mm high. Both models use brushless speed-con- trolled blowers, stainless steel hoppers, and air-cooled aftercoolers and run from a single-phase supply. All models incorporate a programmable controller to
reduce energy use and minimise the risk of over or under drying. This includes 30 pre-pro- grammed drying routines for a variety of resins plus space to store 20 spare user-defined recipes. Features include material overheat protection and real-time energy consumption monitoring. The E-Plus Series is the latest addition
to the Dri-Air Industries product line. The US-based company says the units, which are available with drying capacities of 11, 22 or 45 kg/h, offer faster and more controlled and energy efficient drying of plastic resins. Features include improved hopper insulation, faster regeneration, and optimised air flow. The new units feature a fully-en-
closed design, which the company says makes them suitable for use in areas where cleanliness is a priority. Touch screen electronic control is a standard feature, as is remote monitoring via a smartphone or tablet PC and support for connection to centralised data management systems. Austria’s Wittmann Group introduced an updated
version of its Aton Plus segmented wheel dryer late last year. The new model features an updated design and improved user interface that includes a touchscreen display and graphical menu designed to simplify
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monitoring and control of all connected hopper loaders. The new dryer also incorporates a selection of energy saving features including a weekly timer to control automatic start-up and shut-off, optimisa- tion of the regeneration phase, and auto- matic selection of the drying method in EcoMode. The company says energy savings of up to 48% have been measured over conventional wheel dryers in direct comparison testing. The company has also added an
optional FC plus module for its Drymax battery dryers. FC-controlled dryers automatically adjust the dry air volume to the throughput requirements of each drying battery. The FC plus module supports more energy-efficient operation of drying systems, including the ability to automatically shut off or put dryers to standby during periods of low demand and automatically reactivating them when increased material demand is detected. Intended for high throughput drying applications,
US-based Radio Frequency Company’s Macrowave system employs radio frequency heating to rapidly dry granular materials including plastics. The company claims the volumetric heating technology can be used to dry material streams up to 150mm deep to moisture levels down to 200ppm. It claims the technology can be used in polymer crystallisation and solid-stating of plastics. Also aimed at high volume applica- tions, such as PET bottle flake drying and recrystallisation, Kreyenborg’s IRD infrared drying technology is claimed to reduce process times and cut energy use by as much as 40%. The Germany-based company says the drum-based systems can be config- ured for batch or continuous operation and are said to be particularly suitable for handling regrind materials.
Click on the links for more information: ❙
www.moretto.com ❙
www.maguire.com ❙
www.motan-colortronic.com ❙
www.conairgroup.com ❙
www.dri-air.com ❙
www.wittmann-group.com ❙
www.radiofrequency.com ❙
www.kreyenborg.com
March 2015 | INJECTION WORLD 55
Above: Dri-Air’s
E-Plus models
offer faster and more energy efficient drying
Left: Wittmann has updated its Aton Plus segmented wheel dryers with new control and energy-saving features
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