Ppg Industries, Inc.

Thomas R Trevorrow

Joseph A Gulotta

Robert Gagne

A method and apparatus for the controlling of longitudinal distortion of float glass is disclosed. It is disclosed that longitudinal distortion may be reduced by asymmetric cooling beneath the molten metal bath of a float glass forming chamber.

Method and apparatus for asymmetric cooling in a glass sheet forming

A flat glass manufacturing facility is provided with a threshold for supporting and delivering a layer of molten glass from a glassmaking furnace to a glass forming chamber containing a pool of glass-supporting molten metal wherein the threshold has an upper glass-supporting surface having one or more transverse grooves, each of which extends from an upstream point near the center of the threshold outwardly to the sides of the threshold and in a direction that is oriented slightly in the direction of the glass delivery over the threshold in order to divert a small portion of molten glass in the lowermost part of the delivered layer of glass to the marginal regions of the delivered layer of glass whereby small bubbles or seeds, products of reaction or other contaminants may be diverted from the main portion of the glass to its marginal portions.

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Ford City, PA, United States of America

Thomas R Trevorrow