Liquid spray system for depositing coatings on substrates

Coating apparatus – Projection or spray type – With projector heating – cleaning or conditioning

Reexamination Certificate

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Details

C118S323000

Reexamination Certificate

active

06332923

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates generally to substrates such as glass panels and, more specifically, to a liquid spray system for depositing coatings on substrates such as glass panels for architectural or vehicle applications.
2. Description of the Related Art
It is known to coat a substrate such as a glass panel using an air atomized spray nozzle to transmit a liquid precursor solution to a surface of the substrate. In particular, it is known to use pyrolytic spray deposition of organometallic compounds onto float glass as it emerges from a furnace float tank. During this process, a standard spray gun nozzle is positioned perpendicular to the surface of the substrate, resulting in overspray buildup on the spray gun nozzle which can then drop off, causing defects on the coated substrate. However, when the spray gun nozzle is angled with respect to the surface of the substrate, the spray head remains clean. The spray gun nozzle is traversed across the substrate. However, in this configuration, it is difficult to obtain good coating uniformity due to a heel region of a spray pattern footprint on the substrate; that is, the higher deposition region nearest to the spray gun nozzle. As a result, attempts have been made to use multiple spray gun nozzles which is undesired.
Although the above spray process has worked, it is desirable to more uniformly randomize the spray pattern near the surface of the substrate in order to produce a more uniform coating. It is also desirable to prevent buildup on the standard spray gun nozzle. It is further desirable to use one standard spray gun nozzle to coat the surface of a substrate.
SUMMARY OF THE INVENTION
Accordingly, the present invention is a liquid spray system for depositing a coating on a surface of a substrate includes a support bracket and a liquid atomizer operatively connected to the support bracket to spray a liquid spray. The liquid spray system also includes an auxiliary air nozzle operatively connected to the support bracket to spray a stream of air to meet the liquid spray just above the surface of the substrate. The support bracket is positioned at a predetermined angle relative to the surface of the substrate for depositing a liquid spray coating on the surface of the substrate.
One advantage of the present invention is that a liquid spray system is provided for depositing pyrolytic coatings on large substrates such as architectural glass panels. Another advantage of the present invention is that the liquid spray system uses additional air sources in conjunction with a standard spray gun nozzle. Yet another advantage of the present invention is that the liquid spray system allows the use of one standard spray gun nozzle which stays clean and produces no heel on the substrate. dramatically improves both the efficiency of the spray process, the uniformity of the resultant coating and prevents build-up on spray system parts.
Other features and advantages of the present invention will be readily appreciated, as the same becomes better understood after reading the subsequent description when taken in conjunction with the accompanying drawings.


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