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

By controlling the cooling rate and thermal management of the glass ribbon, and by adopting a distribution feeding device and components to reduce heat loss, the problems of breakage and warping in the forming process of high-refractive-index glass sheets have been solved, achieving efficient, low-cost, and high-quality glass sheet production.

CN122355561APending Publication Date: 2026-07-10CORNING INC
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Patent Information

Application Number
CN202610680912.0
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Priority Date
2020-11-13
Filing Date
2021-11-09
Publication Date
2026-07-10

AI Technical Summary

Technical Problem

Existing technologies for manufacturing high-refractive-index glass optical guides are expensive and time-consuming, and it is difficult to produce glass sheets with acceptable total thickness variation and warping. In particular, the continuous roll forming process can easily lead to glass strip breakage and uneven thickness.

Method used

By controlling the cooling rate and thermal management of the glass ribbon, employing a distribution feeding device and elements that reduce heat loss, the horizontal temperature variation and longitudinal temperature drop rate of the glass ribbon are reduced. By using small-diameter forming rollers and specific cooling methods, the warping and breakage of the glass ribbon are reduced.

Benefits of technology

This technology enables efficient and low-cost production of high-quality high-refractive-index glass sheets, reduces the overall thickness variation and warping of the glass sheets, and improves the forming quality of the glass sheets.

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Abstract

The invention relates to an 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.
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