Manufacturing method of display screen cover plate

Abstract

The invention provides a manufacturing method of a display screen cover plate. The manufacturing method comprises the steps of (1) heating glass to a temperature corresponding to a viscosity value of10<10>-10<8>Pa.s; (2) synchronously quenching the tin surface and the air surface of the glass by using cooling media with different temperatures, and stopping quenching when the temperature of the glass is quenched to a temperature range corresponding to the viscosity value of 10<13.6>-10<12.4>Pa.s; (3) heating the dried pure nitrogen until the temperature is 40-70 DEG C lower than the temperature corresponding to the viscosity value of 10<13.6>Pa.s, and purging and cleaning the two sides of the glass with nitrogen until the temperature of the glass is equal to the temperature of the nitrogen; (4) heating potassium nitrate of which the purity is greater than 99.9% to the temperature of the nitrogen to form potassium nitrate molten salt, then immersing the glass into the potassium nitratemolten salt for ion exchange, and annealing to room temperature after the ion exchange is finished; and (5) conducting cleaning, drying and the like to obtain the display screen cover plate. The method has the advantages that the glass does not need to be ground, and the chemical strengthening strength of the glass cannot be reduced.

Description

Technical field[0001]The present invention relates to the field of display cover cover, and is specifically a method of fabricating a display cover.Background technique[0002]The display cover is usually made of ultra-thin glass (0.10 mm-1.8 mm), cutting, edging, grinding, chemical strengthening, etc., of which chemical strengthening is immersed in glass potassium nitrate, potassium ions in the molten salt The sodium ions in the glass were generated from ion exchange, and the provering effect of potassium ions produced a pressure stress in the glass surface, thereby increasing the strength of the glass.[0003]When the cover is made of ultra-thin glass by float, since the float glass is in contact with the tin liquid, the surface thereof will have a certain degree of otters, which is called "tin surface", and the other side The contact air is called "air surface", in ion exchange, since the "tin surface" sodium ion content is relatively low, the ion exchange is affected, so that the io...

AI Technical Summary

Problems solved by technology

The former will generate more polishing waste liquid, which is not conducive to environmental protection; the latter not only has limited ability to adjust the warpage, but also reduces the strength of chemical strengthening. The reason is that the chemical strengthening of the existing technology is usually below the transition temperature of glass. The subsequent annealing is a process of slowly cooling the glass from the ion exchange temperature to room temperature in order to relieve the stress. During the entire annealing process, even at the higher temperature stage at the beginning of the annealing, the particles in the glass network structure are mostly in the Compared with the inert state, it is difficult to adjust the particle spacing in a large range. Therefore, the latter can only reduce the compressive stress gap between the two sides of the glass. If the warpage is large, it is difficult to reduce the warpage to the ideal range; on the other hand, although During the annealing process, most of the particles in the glass network structure are in an inert state, but the cations located outside the network structure can diffuse relatively freely, especially after chemical strengthening, the potassium ions on the surface of the glass are in a state higher than that in the interior. , there is always a tendency to diffuse to the inside, and the diffusion coefficient of ions is related to temperature. The higher the temperature, the greater the diffusion coefficient. time, diffuse into the glass with a higher diffusion coefficient, and finally reduce the concentration of potassium ions on the glass surface, thereby reducing the strength of the glass due to chemical strengthening