High-torque, high-output compounders can crank out pellets so hot and fast that they overwhelm downstream pelletizers.
High-torque, high-output compounders can crank out pellets so hot and fast that they overwhelm downstream pelletizers. Early solutions were to extend the water tanks or make the strands double back through the same tank. The Witte Co. in Washington, N.J., now offers a pellet screener in a longer frame, modified so that extra cooling fans and dedusting equipment can be added when needed. That flexibility makes the new Witte 300 classifier cost $2000 to $3000 more than the basic Witte 200 classifier. The 300 has a 3-ft-long frame, twice as long as on the 200, and comes with extra elbows and fittings. Adding cooling fans and dedusting with cylones or bag collection costs about $15,000. A prototype 22-in.-wide Witte 300 was built in June and successfully tested on 2500 lb/hr of talc-filled polyolefin.