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Solution: The screw was internally heated by a FIREROD

W A T L O W

Plastics catalog - 7347 Die and FormerHeaters

Case History

FIREROD

®

Heaters MakeOEM Blown Film Machine A Success

® heater with an internalthermocouple for temperaturecontrol. With this approach, approximately 50 percent or more ofthe energy imparted to the resin came from direct thermal conduction rather than mechanically induced friction. Melting occurred simultaneously at the screw flight's root and the point of contact between the resin particles and barrel wall. In the conventional design, melting only occurred at the barrel wall. The FIREROD heater's capability to provide multiple pin construction for increased ampacity, internal thermocouple for temperature control and direct hook-up to three-phase power supply were factors in selecting Watlow for this application. Additional benefits of the new designincluded lower melt temperatures, higher throughput capacity and improved gear pump energy efficiency (lb/hr/hp). Problem: A customer was experiencingdifficulty processing engineered resins for a blown film line and decided to internally heat the screw of their extruder/gear-pump to optimizing the performance and production of the line.
Die and Former Heaters Extrusion 239