drying | Materials preparation
Right: The 1500 FM expands the Dri-Air line of
large desiccant dryers
processing industry has improved its energy efficiency. However, drying of engineering plastics still requires significant energy input. He adds that the requirements of the automotive industry, for example, are continuing to increase, which means that energy consumption cannot be reduced by accepting a lower dew point temperature. He maintains that the target has to be to offer effective drying conditions with a dew point of always better than -50°C and with the lowest possible energy consumption.
Desiccant development In order to meet these demanding requirements, Simar has developed eDry technology for desiccant dryers. New second generation eDry dryers feature optimised energy efficiency and an improved reliability of opera- tion, says the company. The eDry combines these advantages with new control elements. Simar adds that current drying systems can require
regeneration four to seven times each work shift despite energy saving economising circuits being activated. Due to the newly developed ECO technology, Simar says that regeneration frequency can now be reduced to once a work shift. The new technology is based on a recently developed desiccant bed combined with new valve technology that drastically changes the regeneration process. All relevant data are available to the user via USB
Right: The Luxor E A 150 from Motan- Colortronic
interface and can be transferred to other devices. The integrated maintenance schedule allows for higher process security and minimises downtime. Additionally, the new dryer generation is equipped with an interface for remote operation and maintenance services and can be controlled by an Ethernet connection. The PLC display enables the user to keep track of the drying progress as well as to recall a protocol of the actual power consumption. An intelligent recipe administration makes product changes easier. Charles Sears, President
at Dri-Air Industries, says his company currently deals with many requests to integrate its dryers into a moulder’s specific process in a wide variety of ways, by accommodating regrind, blending requirements or adding colour, for example.
44 INJECTION WORLD | March/April 2017
“The hopper banks are always unique in size, quantity and configuration,” he says. “For example, we are currently working on a specialised powder drying application using individual drying containers to load from a drum, placed on a drying station and then onto the machine. Everything is customised. Other areas of development include refinements in controls and mini central systems with small dryers.” Dri-Air Industries has introduced a new dryer model – the 1500 FM – that expands the Dri-Air line of large desiccant dryers. The 1500 FM is based on the com- pany’s 750 FM design while using larger towers and blowers for use with central drying systems and extruders that have outputs of up to 1500 lbs/h (680 kg/h). Dri-Air says that it has a compact footprint of 30 feet2
(2.8 m2 ).
Energy use The company adds that a new regeneration air flow design for the 1500 FM reduces the energy usage level by 25% compared with the previous model. Dry air is used for regeneration or cool down of desiccant towers, allowing for -80 or lower Fahrenheit dew points. The regeneration valve with positive sealing is positioned in such a way that it can easily be seen for quick trouble- shooting without removing any dryer panels. All external panels are hinged for quick access to
internal components. To conserve space, the panels can be slipped off their hinges. The high pressure fan reduc- es the ambient noise level to less than 70 dB and allows the dryer to operate at very low process temperatures to accommodate resins such as PLA. The 1500 FM has Dri-Touch controls that display the operating param-
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