Glass Strip Heating Drawing U-Shaped Temperature Profile

The patent applies local quality by creating a non-uniform temperature distribution across the width of the glass plate during heating drawing. Specifically, the temperature is set to be lower at the central portion and higher at the side portions, creating localized temperature differences that compensate for the natural tendency of glass to flow more at the center. This localized temperature control achieves uniform thickness and excellent flatness while maintaining efficient production speed.

The patent applies preliminary action by achieving the desired flatness and thickness uniformity during the heating drawing process itself, before the glass strip leaves the furnace. By carefully controlling the temperature distribution during drawing, the glass strip is formed with excellent flatness directly, eliminating the need for subsequent grinding and polishing operations. This preliminary formation of the final geometry saves significant production time and equipment costs.

The patent applies parameter changes by modifying the temperature distribution parameter during heating drawing. Instead of using uniform temperature across the glass plate width, the patent establishes a specific temperature profile where the central portion is cooler and the side portions are warmer. This parameter change in temperature distribution fundamentally alters the glass flow characteristics, enabling both high manufacturing efficiency and excellent flatness in the resulting glass strip.