Apparatus and method for roll forming of high refractive index glass sheets

A method of forming a glass sheet includes: (a) forming a glass ribbon from molten glass with a pair of forming rollers; (b) reducing a horizontal temperature change of the glass ribbon over 80% of the entire width of the glass ribbon to 10 DEG C or less before the glass ribbon cools to the glass transition temperature; (c) as the glass ribbon moves longitudinally downward in the solidification zone, controlling the cooling rate of the glass ribbon such that the glass ribbon has a first average cooling rate before the glass ribbon cools to the glass transition temperature and a second average cooling rate after the glass ribbon cools to the glass transition temperature, the first average cooling rate is smaller than the second average cooling rate; and (d) separating the glass sheet from the glass ribbon. 形成玻璃片的方法包括：(a)用一对成形辊从熔融玻璃形成玻璃带；(b)使得玻璃带冷却到玻璃转化温度之前的玻璃带的整个宽度的80％上的玻璃带的水平温度变化降低到10℃或更小；(c)当玻璃带在凝固区中纵向向下移动时，控制玻璃带的冷却速率从而使得玻璃带在玻璃带冷却到玻璃转化温度之前具有第一平均冷却速率以及在玻璃带冷却到玻璃转化温度之后具有第二平均冷却速率，第一平均冷却速率小于第二平均冷却速率；以及(d)从玻璃带分离玻璃