Method of reducing glass sheet marking

A method of reducing marking of a glass sheet wherein said sheet is contacted and marked by glass sheet conveying rolls, comprising the steps of:

• dissolving sodium sulfate in water to form an aqueous solution;
• transporting a glass sheet over a series of conveyor rolls which support and contact a lower major surface of said sheet;
• coating said lower major surface of said sheet with said aqueous solution;
• and
• heating said sheet to evaporate said water from said sheet to leave a water soluble protective layer of sodium sulfate along said lower major surface of said glass sheet to reduce marking of said lower major surface by said conveyor rolls, wherein said sodium sulfate layer is inert with respect to said glass sheet;
• continuing to heat said sheet to its heat softening temperature;
• forming said sheet to a desired curved configuration;
• and
• controllably cooling said sheet.

A method of reducing marking of a glass sheet wherein said sheet is contacted and marked by glass sheet conveying rolls, comprising the steps of:

• dissolving sodium sulfate in water to form an aqueous solution;
• transporting a glass sheet over a series of conveyor rolls which support and contact a lower major surface of said sheet;
• heating said sheet to a temperature sufficient to vaporize said water;
• spraying said lower major surface of said sheet with said aqueous solution so as to vaporize said water on contact with said heated sheet and leave a water soluble protective layer of sodium sulfate along said lower major surface of said sheet to reduce marking of said lower major surface by said conveyor rolls, wherein said sodium sulfate layer is inert with respect to said glass sheet;
• continuing to heat said sheet to its heat softening temperature;
• forming said sheet to a desired curved configuration;
• and
• controllably cooling said sheet.

A method of reducing marking of a glass sheet wherein said sheet is contacted and marked by glass sheet conveying rolls, comprising the steps of:

• dissolving sodium sulfate in water to form an aqueous solution;
• transporting a sheet over a series of conveyor rolls which support and contact a lower major surface of said sheet;
• coating said conveyor rolls said aqueous solution;
• heating said glass sheet and conveyor rolls during at least a portion of said transporting step;
• and
• evaporating water in said aqueous solution from said conveyor rolls to form a water soluble protective layer of sodium sulfate on said conveyor rolls to reduce marking of said lower surface, wherein said sodium sulfate layer is inert with respect to said glass sheet.