PETplanet Insider Vol. 26 No. 12/25 www.petpla.net 17 EDITOUR The control unit with the sensors can be retrofitted to all systems. Scales or similar are not necessary. Dealing with the energy flows during the heating of the granulate did not allow inventor Stefan Bock to rest on his laurels. It is extremely costly in terms of energy to run the preheater at high temperatures, as the exhaust air must first be cooled back down to 60 degrees in order to remove the moisture in the air. So his approach is to heat the dryer (preheater) only to 120 degrees, then 60 degrees warm exhaust air comes out as exhaust air (of course WAVE controlled), so the air does not have to be heated unnecessarily and then cooled down again for dehumidification. In terms of energy, absolute nonsense. The 120 degrees are enough to dry the material down to 20-50 ppm. The low temperatures in the dryer not only save energy, but the material can also be stored under these conditions during production interruptions without it yellowing or degradation increasing. Designed specifically for the challenges of rPET processing, the SuperBooster enables gentle, fast and efficient drying without damaging the material. Using real temperature and air-mass values, the WAVE system displays all relevant energy flows in the dryer, revealing how much energy is delivered to the material, how much is lost, and whether the process is running efficiently. The challenge with the low temperatures is the booster on the injection moulding machine. Very high air volume due to the hot air flows is necessary to achieve the required temperature of the total granulate grain. You can adjust everything very precisely using the WAVE control, but conventional boosters are not designed for the high air mass flows. The classic air flow from below through the material to the top would entrain the granules. So ReduPET takes a different approach. In the patented SuperBooster, the granulate flows on a kind of wall with tiers from top to bottom around the air supply. The air flows horizontally against the granulate and pushes towards the outer wall and not upwards. With the combination of WAVE and SuperBooster, the preform manufacturer can now bring correctly tempered and thus dehumidified material into its plasticising process, energy-efficiently and without bubbles and unmelts, ensuring correct crystallinity in the preform. www.redupet.swiss
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