Substrate glass and manufacturing method

Abstract

The invention discloses a manufacturing method of substrate glass, and the method comprises the following steps that molten glass flows into an overflow groove, flows downwards along overflow weirs on two sides in the overflow groove, passes through overflow edges and is converged at the bottom of the overflow groove to form a glass plate; the overflow groove is divided into three areas in the height direction: the first area is from the vertex of the overflow weir to the bottom face of the overflow weir, the second area is from the bottom surface of the overflow weir to the overflow edge, and the third area is from the overflow edge to the bottom of the overflow groove, wherein the viscosity of the molten glass in the first area of the overflow groove is 25,000-45000 Psi; the viscosity of the molten glass in the second area of the overflow groove is 37,000-60,000 Psi; and the viscosity of the molten glass in the third area of the overflow groove is 90,000-120,000 Psi. By controlling the viscosity of the molten glass, the finished product quality of the glass plate can be more intuitively controlled, the production quality problem caused by large difference of the corresponding relation between the viscosity and the temperature of different glass is avoided, and the higher product quality is achieved by controlling the viscosity of the molten glass.

Description

technical field [0001] The invention belongs to the field of flat glass production, in particular to a substrate glass and a manufacturing method. Background technique [0002] With the increasing use of devices with various flat-panel display functions such as notebook computers and smartphones, the market demand for flat-panel substrate glass for manufacturing flat-panel displays has increased significantly. At the same time, due to the use of large-size flat panel displays, higher and higher requirements are put forward for parameters such as the size, flatness and internal stress of the flat substrate glass. Based on such a sharp increase in demand, the overflow down-draw method plays a pivotal role in the production of flat substrate glass. [0003] The role of the overflow tank in the overflow down-draw method is very important. The overflow tank is a wedge-shaped structure with one end high (called the proximal end) and one end low (called the distal end), with a gr...

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Problems solved by technology

[0004] Nowadays, the production of glass plates tends to be large-scale, and can reach more than 2000mm in the width direction. With the increase of plate width, the difficulty of controlling plate thickness will increase accordingly. The control of factors affecting plate thickness is becoming more and more important in production. At present, the glass plate produced by the overflow down-draw method has the problems of uneven plate thickness and low overflow quality

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