Forehearth Temperature Control Improvement by Application of Solid-State Instruments

Solid-state electronic instruments have been applied to the glass forehearth, where precise measurement and control of glass temperature are needed to ensure adequate gob weight control for extended periods. Comparative experiments between forehearth systems show that a 3:1 temperature control improvement can be achieved by updating conventional control systems. Front-zone temperature deviation can be used to predict a related weight deviation according to the equation ΔW
_T
= 0.58 ΔT where ΔT is in degrees Fahrenheit and ΔW
_T
is in percent. This model is applied in the analysis of a typical forehearth temperature versus weight control relationship.