MI Band Heaters Allow Tighter Temperature Control Than Ceramic Knuckle Band Heaters Problem: A plastics processor was using ceramic knuckle heaters on a Krauss-Maffei plastic extruder to make profile shapes with PVC and TFE compounds. Both resins require operating temperatures in excess of 700°F (370°C). During operation, temperature swings in excess of ±75°F (±24°C) were experienced. The PVC and TFE extrusions responded poorly to these wide temperature variations and product quality suffered. Initial attention was focused on the temperature controller to see if it was causing the wide temperature fluctuations. Further investigation revealed that construction characteristics inherent to the ceramic knuckle heaters were the true source of the problem. The ceramic knuckle's poor thermal cond

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