A CLOSED CONTACT HEATER ASSEMBLY FOR HEAT TREATMENT OF YARN

摘要

The present invention discloses a closed heater type contact heater assembly that facilitates a heat treatment to yarn having a quality of an open heater type contact heater. The contact heater assembly includes a heater tube having a liner tube incorporating contiguous small radius lead in and lead out yarn guiding surfaces. These small radius yarn guiding surfaces desensitise the setting of the yarn control means allowing full and consistent contact of yarn on the closed contact heater assembly. The yarn guiding surfaces may be resiliency mounted to ensure accurate mating of said guiding surfaces to the liner tube thereby automatically compensating for a plurality of tolerance errors thereof. The small radius guiding surface forms a contiguous entry and exit section having radii substantially smaller than a longitudinal radius of a contact surface of the heater tube.