Patent ID: 7696115
Filing Date: 2010-04-13
Classification: C03B,C04B

Abstract:
1. A method of making sheet glass using a fusion process comprising: (A) employing an isopipe which comprises a body having a collection trough and a root, (B) providing molten glass to the collection trough so that the molten glass overflows the top of the trough on both sides and forms two sheets of glass that flow along the outer surfaces of the isopipe and fuse into a single sheet at the root; and (C) drawing the single sheet away from the root using drawing equipment; wherein: the body comprises a zircon refractory which comprises TiO (i) a mean creep rate at 1180° C. and 250 psi of less than 0.7×10 (ii) a mean creep rate at 1180° C. and 1000 psi of less than 3×10 where the mean creep rates are determined using a power law model.