Forming laminated sheet glass
First Claim
1. A method of forming laminated sheet glass which comprises, supplying a first molten glass of one composition to a first overflow channel, supplying a second molten glass of another composition to a second overflow channel, overflowing the first glass from said first channel into two separate downwardly converging sheet-like flow paths, overflowing the second glass from the second channel downwardly into two separate sheet-like flow paths and onto the outer surface of the downwardly flowing sheet-like paths of said first glass to form a pair of downwardly converging laminated flows while said glasses are in a molten condition, uniting said converging pairs of laminated flows into a single composite and drawing a sheet of laminated glass therefrom, and maintaining the outer surface of said second glass free from contact with distributing or forming means so as to provide a laminated glass sheet of fire polished quality.
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Abstract
A first molten glass of one composition is caused to flow downwardly along converging flow paths of a forming member while simultaneously at least one other molten glass of a different composition is flown downwardly along outer surface portions of the first glass such that said glasses are in molten contact with one another during their downward travel and are then continuously formed into a composite or laminated glass sheet. The molten glasses are distributed to the forming member in such a manner as to provide substantially uniform thickness of the glass layers across the newly formed sheet, and various viscosity, glass flow rates and proportionate layer thicknesses may be obtained by varying the degree of tilt of the forming member.
250 Citations
12 Claims
- 1. A method of forming laminated sheet glass which comprises, supplying a first molten glass of one composition to a first overflow channel, supplying a second molten glass of another composition to a second overflow channel, overflowing the first glass from said first channel into two separate downwardly converging sheet-like flow paths, overflowing the second glass from the second channel downwardly into two separate sheet-like flow paths and onto the outer surface of the downwardly flowing sheet-like paths of said first glass to form a pair of downwardly converging laminated flows while said glasses are in a molten condition, uniting said converging pairs of laminated flows into a single composite and drawing a sheet of laminated glass therefrom, and maintaining the outer surface of said second glass free from contact with distributing or forming means so as to provide a laminated glass sheet of fire polished quality.
- 9. Apparatus for forming laminated sheet glass which comprises, first overflow means for forming opposed sheetlike flows of molten glass having substantially uniform thickness across the width thereof, forming means positioned below said first overflow means for converging and uniting said opposed sheet-like flows into a single drawn sheet flow, second overflow means positioned above said first overflow means for overflowing second sheet-like flows of molten glass of substantially uniform thickness downwardly upon outer surfaces of said opposed sheet-like flows of said first overflow means, means for separately feeding molten glass to said first overflow means and said second overflow means, said first and second overflow means having longitudinally extending upper overflow surface portions, and means for longitudinally tilting said upper surface portions of said first and second overflow means with respect to the horizontal.
Specification