Float glass is a sheet of glass made by floating molten glass on a bed of molten metal, typically tin. This method gives the sheet uniform thickness and very flat surfaces. Once off the bath, the glass sheet passes through a lehr kiln, where it is cooled gradually, so that it anneals without strain and does not crack from the temperature change.
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Temperature monitoring in the annealing section of a float glass lehr is critical. Incorrect annealing temperatures or rapid temperature changes cause uneven expansion and contraction, setting up improper stresses in the glass, which affects quality and cutability.
- Traceability of multiple zone annealing temperatures
- Reduced scrap by achieving proper temperature profile across ribbon
- Improved glass quality (warping, cutability)
- Improved profitability of the float glass machine
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