TECHNOLOGY | MATERIALS PREPARATION
drying efficiency while handling return-air tempera- tures of up to 190.5°C (375°F) and dew points of -40°C (-40°F). At the same time, it saves water, maximises dryer portability, and makes installation and set-up faster and easier. The company adds that the dryers have a new
Above: Piovan’s Modula automatic multi-hopper drying system can adapt itself to variable working conditions
In order to meet these challenges Conair says
that, although not new, it has demisters and volatile traps available to condense, trap, and filter the air stream on all its dryers – in sizes from 6.8-2,273 kg/h (15-5,000 lb/h). This helps to keep the dryer clean and desiccant working like new. Wheel drying technology is also efficient and consistent. It has a very long life cycle and can last up to five times longer than traditional beads with no degradation, break down, or maintenance re- quired. In order to enjoy these benefits, it is necessary to keep the air clean. Conair recently marked the re-design of the
Carousel Plus with the launch of new small- and mid-sized desiccant dryers. The company says that the D Series portable dryers and dX Series mobile drying/conveying systems offer good resin-drying performance together with advanced yet easy-to- use controls, high reliability and energy efficiency, and a new air-to-air after-cooling option. Conair adds that the new dryers are the product
of a re-design of its Carousel Plus desiccant dryer architecture affecting portable dryers and mobile drying/conveying systems – the former W Series and MDCW Series – sized from 6.8-181 kg/h (15-400 lbs/h) throughput. The D and dX Series dryers now combine a new and feature-packed control interface with high-reliability components that maximise performance, uptime and energy efficiency. These are housed in a new, space-effi- cient chassis that not only preserves floor space but offers easier, more direct access to key compo- nents and to user-serviceable items like filters. The new D and dX Series dryers also utilise new
air-to-air after-cooling. After-cooling is required to reduce the temperature of the return air from the drying hopper, which improves the moisture-ab- sorption efficiency of the desiccant. Now, proces- sors may specify dryers equipped with either an optional air-to-water after-cooler or the new air-to-air after-cooler. The air-to-air unit can sustain
40 INJECTION WORLD | March 2019
DC-C programmable logic controller, which was developed specifically for drying applications. The control uses software developed by Conair to maximise flexibility in adapting to current and future customer application needs. It is available on both the D and dX Series dryers in two configura- tions: the DC-C Plus package features a 4-inch touchscreen user interface, while the DC-C Premium offers a 7-inch screen. Both configurations share a common interface
layout, making them easy for processors to learn, regardless of dryer size. Both offer dew-point monitoring and control, energy-use reporting, heater on-time trending and predictive mainte- nance as standard features. As standard, Premium units add more energy-saving features, including Temperature Setback, which automatically adjusts drying air input temperatures to avoid overheating, and an optional Drying Monitor, which utilises RTD sensors in the hopper to confirm that proper drying conditions are maintained. These are options on the Plus. Premium units also offer remote access and control capabilities and enhanced monitoring and alarm functions. Both control configurations offer built-in loader options as well. The Plus configuration includes options for one loader, the Premium for two, typically with the first loader option used for the processing machine and the second serving the dryer hopper. Dryers supplied as part of dX Series mobile drying/conveying systems include a stainless-steel hopper, conveying blower, dust collector and direct-feed vacuum receiver – all assembled on a safe, convenient wheeled cart. Loaders can be supplied with a sensor to confirm resin fill levels, a ratio valve for loading two materials (typically a regrind and a virgin) into the dryer, and a choice of long- or short-distance conveying blowers.
Italian ancillary equipment manufacturer Piovan sees the priorities of the latest developments in drying technology as being a need to increase the energy efficiency of systems and make them fully automatic in order to be able to respond to changing working conditions over time. “Reducing operator intervention, maintaining a stable process under control even with variable running condi- tions, as well as tracking raw material flow along the process, are now the common requirements from
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