Patent ID: 9573844
Date: 2017-02-21
CPC Classifications: C03C

Claim:
1. A powder coating method to provide a light impenetrable coating on a glass article, the method comprising: preheating an oven to a first air temperature; placing the glass article in the oven; heating the glass article in the oven at the first air temperature until the glass article reaches a first glass temperature and/or for a first set time; removing the glass article from the oven; applying a first powder coating to the glass article, wherein the first powder coating is of a first powder of an epoxy or polyester with a first particle size of 25 μm; heating the oven to a second air temperature; placing the glass article in the oven; heating the glass article in the oven at the second air temperature for a second set time to reach a desired curing; removing the glass article from the oven; applying a second powder coating to the glass article, wherein the second powder coating is of a second powder of polyester with a second particle size of 30 μm and is solvent resistant; heating the oven to a third air temperature; heating the glass article in the oven at the third air temperature for a third set time to reach a final curing wherein the second powder coating interacts with the first powder coating such that particles of the second powder merge with particles of the first powder; removing the glass article from the third oven; letting the glass article cool at room temperature; wherein a resulting powder coated glass article blocks all visible light.