TECHNOLOGY | MATERIALS HANDLING
X Comb dehumidifiers are intended for highly hygroscopic technical materials. The compact ON series is suitable for installa- tion directly on the mouth of the processing machine. The Side series includes larger models handling up to 24 kg/h, with the installation, not surprisingly, next to the machine.
As with all Moretto dryers, the
Moisture Meter can also be installed on the X Comb series. This analyses and detects the exact content of
residual moisture levels down to 15 parts per million. Wittmann Aton dryers use some- thing called segmented wheel technology, which the company says has been continuously refined since its intro-
Above: Moretto’s X Comb dryer
Right: Wittmann’s Aton H1000 battery dryer
duction around 10 years ago. “While the original overriding goal was to achieve a constant dew point behaviour even under the most difficult conditions, users very soon started to demand particularly energy-efficient solutions,” the company says. To cater to the increasing trend towards produc- tion equipment integration, an interface solution was created for Wittmann 4.0 (which enables the connection and use of injection moulding ma- chines, robots and auxiliary equipment via Unilog B8 control units on the Wittmann Battenfeld injection machine), and the Wittmann dryers were also equipped with larger touch screens. The Aton segmented wheel dryers, which sit beside the machine, can handle a dry air volume ranging from 30 to120 m³/h. The latest Aton generation includes a battery dryer model, the Aton H1000, which debuts at K2019. This dryer, frequency-controlled in all versions, is the first segmented wheel dryer for central plants. It can handle a dry air volume of 1,000 m³/h, which can dry 500 to 600 kg/h of granulate. The drying wheel, consisting of numerous segments, is loosely filled with a desiccant, and is rotated via a low-maintenance chain drive, so that a molecular sieve which is always fresh is available for the air to be dried, in order to maintain a constant, low dew point. The unit comes with several
different adjustment options, including dew point-controlled drying. LEDs in different colours
58 INJECTION WORLD | October 2019
inform operators at a glance about the current status of the dryer. The appliance has the obliga- tory touch screen user interface, where the temperatures and the dew point are displayed. Maguire will be showing its Ultra Low Energy vacuum dryer at the show. The company says it is significantly more energy-efficient than conven- tional drying systems. Both use the same amount of energy to bring the material up to drying temperature from ambient temperature, but the energy used during drying is dramatically different. According to Maguire, a desiccant dryer uses ten times the energy of an Ultra dryer in this phase. The dryers have a touchscreen that enables users to show the process graphically. Load cells on the vacuum chamber and retention hopper allow the drying rate to match the process rate. A pre-heat hopper that is smaller than most means the unit holds less material in the process, so it uses less energy. Ultra dryers also feature fast drying times using vacuum as the main method. “Typically this is one-sixth of the drying time of a conventional desiccant dryer,” says the company. So, for exam- ple with polycarbonate, which a desiccant dryer can take three to four hours to dry, an Ultra will take 30-40 minutes. Maintenance requirements should also be
lower, since there is no desiccant to replace, no process filter to clean, and no chilled water connections. Maguire provides a five-year warranty. Chris Crittenden, a director at Maguire IMEA, says the touchscreen “fundamentally changes how an operator can use the dryer. We equip each dryer with two pairs of load cells, one pair on the vacuum chamber and one pair on the material retention (feed) hopper. This allows us to then make the software far more intuitive – so an operator can see exactly what the status of the dryer is, how much material is in process, what the demand on the dryer is and exactly what the ‘live’ consumption is. Seeing exactly what is in process down to the last gramme allows us to add more interactive software functions like Dynamic Drying – where the system sees the demand for dried materials go up or down and automatically increases or decreases the material in process. This is more energy efficient and better for technical raw materials.” The dryer also has im-
PHOTO: WITTMANN
www.injectionworld.com
PHOTO: MORETTO
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