B - Operations – Transporting – 05 – C
Patent
B - Operations, Transporting
05
C
32/23
B05C 5/02 (2006.01) C03C 17/22 (2006.01)
Patent
CA 1147139
Abstract of the Disclosure This disclosure describes an improvement in an apparatus for forming a continuous coating of progressively changing composition on heated glass over the length of a processing path through which said glass passes said apparatus comprising, in addition to means to support said glass and means to move it continuously along said processing path, the improvement wherein there is provided a reaction zone the interior surfaces of which are formed primarily by said moving glass and a heat-transfer-medium moderated, temperature-controlled wall opposed to said glass said zone having, at one end thereof, a port means at a first station to introduce and distribute a gaseous reaction mixture comprising reactants which form reaction products that deposit on said glass at different rates, a gas flow path within said reaction zone wherein said gaseous reaction mixture flows along said glass surface, and said temperature controlled wall to port means at a second station at the opposite end of said zone to remove residual gaseous reaction mixture, wherein said second station being relatively positioned along said reaction zone with respect to said first station that said heated glass wall of said reaction zone forms means to provide sufficient energy to said gaseous reaction mixture to achieve a substantial difference in composition deposited on said glass between the reaction gas mixture composition, as it passes between said first station and second station and wherein said temperature-controlled wall is maintained at a temperature low enough to avoid deposits of reaction products thereon. A particular advantage of the invention is that it can be used to make glass having a coating with a layer of continuous- ly varying refractive index between the glass and the coating preventing the observation of iridescence. The apparatus is particularly efficacious when applied to clear and lightly tinted glasses wherein the problem of iridescent color has had its greatest commercial impact.
405646
Gordon Roy G.
Smart & Biggar
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