Contouring glass seal edge
AssigneeCorning Glass Works
InventorJoseph W. Anderson
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Abstract
In the sealing of two glass surfaces together in the formation of a hermetically sealed hollow article, it is important that the opposed seal edges be uniformly complementary along their sealing extent, and a method of sagging the seal edge to a desired surface contour is disclosed.
Claims8
A method of conforming the seal edge of a one-piece glass article to a desired surface contour which comprises, providing a glass-ceramic sagging mold with a surface contour equivalent to the desired contour of said seal edge, positioning said one-piece glass article upon the contoured surface of such sagging mold, rapidly heating said mold and said glass article to a sagging temperature between the annealing point temperature and softening point temperature of the glass composition from which said article is formed, maintaining such temperature for a time sufficient to gravitationally conform said seal edge of said article to the contoured surface of said sagging mold, rapidly cooling said article to its annealing point temperature, maintaining said article in the transformation range between its annealing point temperature and strain point temperature for a time sufficient to inhibit the generation of internal surface stress on said article, and then rapidly cooling said article to handling temperature.
Dependencies are inferred from the claim text.