Patent Number: 6,167,728

Title: Method and apparatus for controlling heating and cooling in segments of a fiber glass bushing

Abstract: A supplemental controller for a fiber glass bushing actively performs heating and cooling of a connected segment of the bushing which is otherwise controlled by a primary controller. In one embodiment, the supplemental controller performs heating by means of current injection into a connected bushing segment and cooling by means of current diversion from or around the connected bushing segment. Initial start-up and balancing operations can be performed without activation of the supplemental controller. In another embodiment of the invention, the supplemental controller heats a bushing segment by injecting current in-phase with current from the primary bushing controller and cools the bushing segment by injecting current out-of-phase with current from the primary bushing controller.

Inventors: Varrasso; Eugene C. (Heath, OH), Sanik; Paul S. (Galena, OH)

Assignee: Advanced Glassfiber Yarns, LLC

International Classification: C03B 37/07 (20060101); C03B 37/00 (20060101); C03B 37/09 (20060101); G05D 23/19 (20060101); G05D 23/20 (20060101); G05D 23/22 (20060101); G05D 23/24 (20060101); C03B 037/07 ()

Expiration Date: 01/02/2018