Analysis of Bubble Caused by Refractories in Ultra Clear Glass Production and Solutions

      In the production of ultra clear glass on a float glass line a big number of bubbles presented.The bubbles distributed irregularly 

cross the ribbon.On the thickness direction the bubbles located mostly in the center to bottom.Gas composition in the bubble was 

tested.By analyzing the gas amount of N2,CO2 and Ar the source of the bubbles was confirmed which was from the refractories of 

the refiner bottom.A lot of steps were taken to lower down the temperature and the flow on the boundary between refractories and 

glass melt and then the bubble defects disappeared.After the glass melt drain off and a check of the furnace significant corrosion to

 the refiner bottom refractories was found.This proved the judge of the origin of the bubbles from the refiner bottom refractories is 

right.