Patent ID: 8549883

Claim:
A method for controlling glass temperature in a forehearth that includes at least one burner associated with said forehearth for heating glass in said forehearth, a manifold coupled to said burner, a combustion fuel supply coupled to said burner, a combustion air blower for delivering air under pressure to said manifold, and a cooling air supply communicated with the manifold, said method including: generating a nominal burner pressure curve as a function of the amount of cooling air provided to the manifold wherein the pressure curve includes a first portion in which the glass temperature downstream of the burner over a first range of desired temperature conditions is controlled at least in part by adjusting the amount of cooling air provided to the system and the pressure curve includes a second portion in which the temperature downstream of the burner over a second range of desired temperature conditions different from the first range is controlled at least primarily by adjusting the burner pressure; and controlling the burner pressure as a function of combustion air pressure provided to said burner and temperature of combustion air downstream of said blower and delivered to said manifold according to the nominal burner pressure curve.