Non-dusting roll for tft glass

Abstract

A refractory roll cover is described that reduces the amount of noxious dust during the production of glass sheet. The roll cover comprises a plurality of segments, including low dusting millboard segments mechanically supported by highly rigidized compressed fiber segments. The millboard segments are adapted to contact the glass sheet. The millboard is chosen so that any dust produced has little affinity for the glass sheet or is not easily fluidized by convective currents. The highly rigidized compressed fiber has a fused surface that releases little dust. The resultant roll cover substantially eliminates dusting while providing a mechanically superior roll cover.

Description

technical field [0001] The present invention relates to a roll for producing glass sheets by down-drawing molten glass, and more particularly to a pulling roll for producing glass for thin film transistors of active matrix displays. Background technique [0002] The production of glass sheets often requires refractory-coated rolls. In the past, refractory coverings have often included asbestos fibres, as disclosed, for example, in US1594417 to Kobbe, US1678345 to Mattison and US3334010 to Moore. Asbestos is known to be a health hazard, so refractory coverings no longer contain asbestos. Therefore, other natural fiber ores are used instead of asbestos, other fiber ores such as calcium silicate rock ore and synthetic fibers of ceramics or glass. Clay-based compositions may also be used. This clay-containing composite is sometimes called a millboard. For example, Britt US 4,487,631 discloses a refractory covering comprising hemp board, especially glass fibers and clay. Har...

AI Technical Summary

Problems solved by technology

Unfortunately, the thermal instability of the mat rolls often leads to high temperature performance issues such as the separation of several mat segments adjacent to each other and the resulting wear

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