Glass manufacturing – Processes – Reshaping or surface deformation of glass preform
Patent
1976-07-01
1977-08-23
Kellogg, Arthur D.
Glass manufacturing
Processes
Reshaping or surface deformation of glass preform
65288, 65291, 65374RM, C03B 2302
Patent
active
040437841
ABSTRACT:
Shaping glass sheets of soda-lime-silica compositions by gravity sagging into complicated shapes having a portion of convex curvature and another portion of concave curvature requires a continuous shaping surface onto which a supported glass sheet is heated and sags. The present invention provides a method of bending soda-lime-silica glass sheets onto curved molds of a complicated curvature comprising a previously shaped sheet of a glassy composition having a heat capacity approximating that of the soda-lime-silica composition and a lower coefficient of thermal expansion and a higher deformation temperature than those of the sode-lime-silica composition of the glass sheet to be bent. The layer of glassy composition which provides the mold shaping surface is in turn supported on a metal frame of outline configuration conforming in elevation and outline to the shape of the layer of the special glassy composition, and preferably has a minimum thickness at least equal to the glass sheet to be shaped to insure that when the composite mold comprising the shaped outline metal frame and the superimposed shaped layer supporting a glass sheet to be shaped is heated to the deformation temperature of the glass sheet, the layer retains its shape sufficiently to be used as part of the composite mold in subsequent bending operations.
A layer of knit fiber glass composition is held in stretched relation over the upper shaping surface of the layer of special glassy composition to reduce the possibility of surface damage to the shaped glass sheet. Glass sheets shaped on such composite molds by gravity sagging conform closely to the desired complicated shape and also have a desired stress pattern in the marginal edge portion.
REFERENCES:
patent: 3507639 (1970-04-01), Seymour
patent: 3973943 (1976-08-01), Seymour
Mortimer James R.
Reese Thomas J.
Tobin Melvin W.
Kellogg Arthur D.
Mates Edward I.
Millman Dennis G.
PPG Industries Inc.
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