Refractory system for bushing assembly

Abstract

A fiber forming bushing assembly includes a frame and a bushing within the frame. One or more sections formed of a pre-cast refractory material are positioned between at least a lower sidewall of the bushing and the frame.

Description

technical field [0001] The present invention relates generally to a heat resistant system for producing continuous filaments, and more particularly to bushing assemblies in filament forming equipment. The invention can be used in continuous glass filament and mineral fiber production. Background technique [0002] Bushings used in filament or fiber production have thin metal side walls, end walls and a bottom that form a heating chamber. The heating chamber is surrounded by thermal insulation. This bottom has the bushing orifices located therein, from where the molten material is attenuated to produce fibers. These walls and bottom are made of a noble metal (usually a platinum-based alloy) capable of withstanding the elevated bushing operating temperatures. The end walls of the bushings have electrical terminals or lugs between which current passes through the bushing walls, heating the bushing walls to operating temperature. [0003] During fiber forming operations, the...

AI Technical Summary

Problems solved by technology

In particular, this insulation is prone to cracking and separation from the bushing and frame, leading to premature failure of the bushing

Additionally, the use of cast materials increases downtime for fiber forming equipment, as the insulation needs to set and cure, often taking days to cure

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