超薄玻璃浮法成形机制与拉薄过程初步分析

The Forming Mechanism and Preliminary Calculating Analysis of Stretching Process of Ultra Thin Float Glass

现代显示技术的发展要求制备出高质量超薄玻璃的精细技术。本文整理总结了普通浮法薄玻璃成形基本理论,并将其应用于高碱铝硅超薄玻璃的拉薄分析;用数值方法,通过编程,对Narayanaswamy方程进行了数值求解,从理论上初步分析了薄玻璃的拉薄机制。在此基础上,研究了玻璃温度(黏度)和纵向拉力对超薄玻璃拉制过程的影响。从平衡厚度和薄玻璃回缩增厚速度角度,超薄玻璃的拉薄比普通浮法玻璃拉薄要求的条件更为严苛。在低温下,使用大的纵向拉力,虽然也能拉出超薄玻璃,但从维持生产稳定与控制,适当提高拉制温度,并配置合适的横向拉边以防已拉薄玻璃在高温下的快速回缩增厚是较合理的。

The modern display technology requires a sophisticated technique for producing high quality ultra-thin glass. In this paper the basic theories of forming process for ordinary float glass were summarized. These theories were used to analyze the stretching process of ultra-thin high-alkali alumino-silicate glass. Through programming the Narayanaswamy's equations have numerically solved and the thinning mechanism of ultra-thin glass was theoretically explored. The influence of glass viscosity and longitudinal tractive force on the stretching process has been studied. In view of glass equilibrium thickness and retracted speed of thin glass, the ultra thin float glass needs stricter requirements than those of the common float glass. A higher forming temperature with suitable edge rollers is better for ultra-thin glass production.