Glass plate float annealing process and equipment thereof

Abstract

The invention provides a glass plate float annealing process and equipment thereof. The process is characterized in that a glass annealing tin bath is connected to the tail end of a glass forming tinbath of a float glass production line so that a glass plate floats on a metal tin liquid level to complete the annealing process, and is led out at a lower temperature above the melting point of metaltin to enter a cold end process.

Description

technical field [0001] Glass production process, especially float glass annealing process. Background technique [0002] So far, in the glass production line, the annealing of the glass plate is carried out in the roller type glass lehr. This annealing process has always had some insurmountable shortcomings: First, the many glass plate rollers in the roller table (also glass plate friction drive rollers), they cannot be completely parallel in the horizontal and vertical directions, and during the movement process Unavoidable vibration, self-deflection and speed difference and other factors make the surface of the glass plate inevitably damaged and produce micro-cracks, which greatly reduces the strength of the glass plate. This is also the reason why the actual strength of the glass plate is two orders of magnitude lower than the theoretical strength; the second is that the roller-type glass annealing furnace uses flowing air as the heat exchange medium with the glass plate...

AI Technical Summary

Problems solved by technology

This annealing process has always had some insurmountable shortcomings: First, the many glass plate rollers in the roller table (also glass plate friction drive rollers), they cannot be completely parallel in the horizontal and vertical directions, and during the movement process Unavoidable vibration, self-deflection and speed difference and other factors make the surface of the glass plate inevitably damaged and produce micro-cracks, which greatly reduces the strength of the glass plate

This is also the reason why the actual strength of the glass plate is two orders of magnitude lower than the theoretical strength; the second is that the roller-type glass annealing furnace uses flowing air as the heat exchange medium with the glass plate, and its disadvantages are temperature uniformity and heat exchange speed. It is difficult to control accurately for a long time, which will cause the glass plate to explode due to stress concentration; third, the heat capacity of the gas is low and the heat exchange is slow, resulting in a long annealing kiln, which greatly increases the investment; fourth, its mechanical processing and The installation requires high precision, so that the cost of the roller-type glass annealing furnace is high, and the construction and commissioning period is long.

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