Deposition methods for high quality reflectance coatings

A method for depositing film onto a glass sheet, the method comprising:

• a) providing a coater having a path of substrate travel extending through the coater, the coater including downward coating equipment mounted above the path of substrate travel;
• b) conveying the glass sheet along the path of substrate travel in a generally horizontal orientation wherein a top major surface of the glass sheet is oriented upwardly and a bottom major surface of the glass sheet is oriented downwardly;
• and
• c) operating the downward coating equipment to deposit upon the top major surface of the glass sheet a coating including a sequence of at least seven film regions comprising, moving outwardly from the top major surface of the glass sheet, a first transparent dielectric film region, a first infrared-reflective film region comprising silver, a second transparent dielectric film region, a second infrared-reflective film region comprising silver, a third transparent dielectric film region, a third infrared-reflective film region comprising silver, and a fourth transparent dielectric film region;
• the method comprising depositing said at least seven film regions in a single pass of the glass sheet through the coater, and wherein during this single pass the glass sheet is conveyed at a conveyance rate of 400 inches per minute or faster.