Microcrystalline glass plate production process

Abstract

The invention relates to a microcrystalline glass plate production process, which comprises the following steps: carrying out calendaring molding on molten glass with the temperature of 1250-1450 DEG C, cooling to below 1050 DEG C through a transition carrier roller, feeding into a tin bath, and preparing the microcrystalline glass plate by adopting float molding, wherein the surface roughness of the microcrystalline glass plate is 6.7-10 [mu] m, the flatness is 0.5-0.08 mm, and the curvature is smaller than 0.08% . The production process of the microcrystalline glass plate is wide in application range, the microcrystalline glass plate can be suitable for the forming temperature ranging from 1250 DEG C to 1450 DEG C aiming at the characteristics of high forming temperature and crystallization temperature of the microcrystalline glass, the microcrystalline glass plate prepared by the process is excellent in product quality, and compared with the traditional microcrystalline glass which can only be produced by a pure rolling method, the process can even produce a glass ceramic product comparable to that produced by a float method, omits the subsequent grinding and polishing process of the product produced by a pure rolling method, saves a large amount of manpower and material resources, and reduces the pollution of the subsequent process to the environment.

Description

technical field [0001] The invention belongs to the technical field of glass manufacturing, and relates to a production process of a glass-ceramic plate. Background technique [0002] At present, there are several different types of forming processes in the world, such as vertical pull-up method, flat pull method, overflow method, platinum furnace pull-down method and float method, which can respectively draw flat glass with different thicknesses from 0.1 to 30mrn. [0003] Thin flat glass has the following production processes [0004] 1Platinum furnace down-draw process [0005] German EGLASS Platinum Technology Co., Ltd. first successfully developed the 0.7t / D platinum furnace down-drawing process technology and equipment in 1983, which can draw ultra-thin transparent flat glass with a thickness of 1.1mm and a plate width of 250mm. Today, the company can design and provide a platinum furnace with a daily output of 6t, which can draw ultra-thin glass with a thickness of ...

AI Technical Summary

Problems solved by technology

The disadvantage is that the output is small and the plate width is narrow. Due to the size limit of the overflow tank, the plate width is usually less than half of the width of the float glass plate

The main manufacturer of Corning Corporation is currently only using the calendering method for production, but the calendering method produces glass-ceramic thin plates. The surface roughness of the relatively good non-grinding plates in China is 18-20 μm. Taking a 1m wide and 3mm thick plate as an example, the flatness In the range of 0.1-0.2mm, the curvature is >0.1%. This process forms thin plates with a thickness of less than 1mm. Taking mobile phone cover plates as an example, only 1.0-1.2mm plates can be produced and polished to 0.6-0.7mm, and the production efficiency is relatively low.

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