MATERIALS | MATERIALS HANDLING
Right: Farrag will show its Card E/S, Card M and Card L/XL bulk materials dryers at K2019
from the air compressor has meanwhile led to resin drying which can mostly dispense with additionally supplied energy. At K2019, the company showed its Card E/S,
Card M and Card L/XL bulk materials dryers. These variants can, among other things, be combined with systems for condensation water protection and for internal mould cooling. This way, they make the whole process more efficient, says the com- pany.
“It has to be assumed that resin drying using
compressed air will become the standard in the plastics industry in the years to come,” said Farrag.
Energy efficient Maguire showcased its vacuum resin dryer, which it says uses a fraction of the energy of a desiccant dryer. The dryer, which has been renamed Ultra (it was formerly called VBD), can drastically reduce energy bills, says the company. “While the energy needed to heat polymer to its
The dryer, first developed in the 1990s, relies on a new method of drying. “In extrusion blow moulding, it was standard for a long time to vent the dry blower air at the end of each cycle,” said Rainer Farrag, founder of the company. “As a result, a lot of unused air – and energy – was lost, which I found was a pity. The idea struck me to use this air for resin drying.” Using compressed air from an upstream process
to dry resins made it possible to dehumidify material with minimal extra energy – and no moving parts. It proved a cost-effective, reliable alternative to adsorption drying. Although the basic design is the same, improve- ments continue to be made: better process integration, modern controls – such as the Sleep mode – and the reduction of the amount of air after reaching a particular temperature in the upper range of the drying hopper all help to reduce energy consumption further. The heat recovery
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required temperature is roughly the same for both vacuum and desiccant dryers, the Ultra dryer uses much less energy in the next stage – when the heated resin is actually dried,” said Frank Ka- vanagh, vice president of marketing and sales at Maguire.
He cites a typical example for a process running
at 220lbs (100kg) per hour, for 6,000 hours per year. An average desiccant dryer might run at 60 Watts per pound of material, versus the Ultra, which consumes 19 Watts per pound. While each system uses around 15W to heat the material from ambient temperature, the energy used to dry is very different: the desiccant dryer would use another 45W, while the Ultra uses just 4W – around 10 times less. For an average US price of $0.12/kW, the annual
energy bill for the desiccant dryer is $7,128, and $570 for the Ultra. “Over the average lifespan of a dryer, that
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