Composite seal for a glass forming chamber
AssigneePPG Industries, Inc.
InventorsMahesh C. Bhardwaj, William J. Englert
Life of this patent
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Abstract
A composite seal comprising a resilient, compressible refractory material, preferably fibrous, sandwiched between two sheets of graphite or like material is placed between metal casing plates or coolers and refractory pieces, blocks or members disposed inside a glass forming chamber which contains a molten glass supporting metal that is in contact with at least some of such refractory pieces, blocks or members. The leakage, diffusion or transpiration or gases into the chamber is substantially reduced or eliminated.
Claims10
In an apparatus for making flat glass comprising a glass furnace connected to a forming chamber through a molten glass delivery facility wherein the forming chamber includes an impervious metal casing having an inner refractory liner containing a pool of molten metal for supporting glass during forming and the delivery facility includes a refractory support mounted at least partially inside the casing for supporting molten glass during its delivery to the forming chamber, the improvement which comprises:
- a substantially impervious, flexible and compressible composite layered seal disposed between the refractory support and the casing, said composite layered seal comprising a pair of outer layers and an inner layer therebetween each of said layers having a surface in coextensive contact with that of an adjacent layer, said outer layers being composed of a flexible and substantially impervious dense refractory material and said inner layer being composed of a compressible less dense resilient refractory material.
Dependencies are inferred from the claim text.