TECHNOLOGY | ENERGY MANAGEMENT
Right: Wittmann’s CARD 3G/FIT dryer with touch operation panel, formulation memory and alarm light
CARD dryer (depending on the model). The dryer then automatically reduces the heat output and quantity of air supply. This immediately protects the material and reduces the consumption of electricity and compressed air. As soon as the processing machine is restarted, it can continue to operate at once with dried material. The dryer starts to regulate the drying process at the right moment and raises the drying temperature as required. Rampen mode also permits unlimited drying of sensitive materials, which tend to get sticky when heated. In this mode, the drying temperature is raised in two steps. For example, if polycarbonate is to be dried, the material can be pre-dried at 80°C for about 75 minutes following initial filling of the container, and subsequently the drying process can be continued at the desired temperature of 120°C. In this way the material, which is mostly stored at room temperature or in cooler storage halls, can be gently preheated at the first fill, before being completely dried at the target temperature. The Count Down mode provides a signal output, which can be used for a machine startup. When production is started on a processing machine, it is very often important to know how long the material drying equipment has already been active and whether the material has been dried sufficiently.
The Count Down mode shows the time which has already elapsed on its display panel and finally issues a signal when the preset period of time is over.
Depending on the
model, the air quantity regulation in CARD dryers is controlled in an analog or digital form via the tem- perature. Here, digital control provides a higher degree of precision, and the correct value for the temperature range to suit the material can be stored in the control system. For
strongly hygroscopic materials, such as polyamide, this automatic air supply control can be deactivat- ed. This function is called the Power mode, which permits a constant drying process with the neces- sary quantity of compressed air.
CLICK ON THE LINKS FOR MORE INFORMATION: �
www.tangram.co.uk �
www.engelglobal.com �
www.hb-therm.com �
www.arburg.com �
www.simcon.com �
www.sumitomo-shi-demag.eu �
www.bmb-spa.com �
www.dr-boy.de �
www.maguire.com �
www.wittmann-group.com
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IMAGE: WITTMANN
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