Process and apparatus for coating glass

Details Process and apparatus for coating glass Process and apparatus for coating glass

B - Operations, Transporting

05

D

32/23, 117/85

B05D 1/02 (2006.01) C03C 17/00 (2006.01) C03C 17/23 (2006.01) C03C 17/245 (2006.01) C23C 16/40 (2006.01) C23C 16/453 (2006.01)

Patent

CA 1300438

ABSTRACT (Figure 11) PROCESS AND APPARATUS FOR COATING GLASS Apparatus for use in pyrolytically forming a metal oxide coating on an upper face of a hot glass substrate 1 in sheet or ribbon form comprises conveyor means 2 for conveying the substrate 1 in a downstream direction 3 along a path also lndicated at 1 and a roof structure 5 defining a coating chamber 6 opening downwardly onto the path and comprising a passageway 11 along which coating precursor vapour and oxidising gas can be conducted downstream in contact with the upper substrate face during the conveyance of the substrate. The roof structure 5 defines, in or adjacent the upstream end of the passageway 11, a mixing zone 7 which opens downwardly onto the substrate path 1. Means such as spray nozzle 35 is provided for injecting coating precursor material into the mixing zone 7 from a height of at least 50cm above the level of the substrate path 1. Means such as ducting 58 is provided for injecting oxidising gas into the mixing zone in which coating precursor material and oxidising gas can be brought together, mixed and heated to form an atmosphere comprising an intimate mixture of precursor vapour and oxidising gas. The mixing zone 7 is in communication with the passageway 11 to permit a stream of such atmosphere to flow along the passageway from the mixing zone. In operation, coating precursor material and oxidising gas are introduced into the mixing zone 7 of the chamber 6 in or adjacent the upstream end of the passageway 11, heat energy is supplied to the mixing zone 7, by the hot substrate alone or with the aid of supplementary heaters 17, and the precursor material and oxidising gas are thoroughly mixed in the mixing zone 7 while exposed to the substrate 1 but at a height such that coating formation commences from a substantially homogeneous vapour mixture, and such mixture is caused to flow continuously along the passageway 11, in contact with the upper face of the substrate.

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