Non-dusting roll for tft glass

Abstract

The present invention discloses a refractory roll cover that reduces the amount of harmful dust generated during the production of glass sheets. The roll cover has multiple segments including low dust hemp board segments that can be mechanically supported by highly hardened compressed fiber segments. The hemp sheet segments may be in contact with the glass sheet. The selection of this hemp sheet will make any dust generated have little affinity for the glass sheet or be easily fluidized by convection. Highly stiffened compressed fibers have a fused surface that releases little dust. The resulting roll covering is essentially capable of eliminating dust while also being a roll covering with good mechanical properties.

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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