Manufacturing method of ultrathin heat-reinforced glass

Abstract

The invention discloses a manufacturing method of ultrathin heat-reinforced glass. The manufacturing method comprises the following steps of: flatly placing ultrathin glass with the thickness of 1.8-2.2mm on a rolling way, adjusting the pressure of convection air in a toughening furnace to be 2000-4000pa/cm<2> with the convection time of 30-50s, simultaneously using the rolling way to drive the glass to do reciprocating movement for 40-50S in the toughening furnace at a speed of 20-30mm/s, and then adjusting the operating speed of the rolling way to be 160-175mm/s till the glass is heated to be 623-630 degrees. The glass manufactured by utilizing the method has the advantages that the generation of 'white mist' is avoided, and the glass is good in flatness, high in strength and good in toughness.

Description

technical field [0001] The invention relates to a glass manufacturing method, in particular to a manufacturing method of ultra-thin heat-strengthened glass. Background technique [0002] Heat-strengthened glass, also known as semi-tempered glass, is a variety between ordinary flat glass and tempered glass. It has some advantages of tempered glass, such as higher strength than ordinary float glass, and is the number of ordinary float glass. At the same time, the flatness is higher than that of tempered glass, it is not easy to self-explode, and once damaged, it will not be broken as a whole, so it is widely used. [0003] At present, the ultra-thin heat-strengthened glass with a thickness of 1.8-2.2mm mainly has the following problems: First, the flatness of the glass cannot meet the requirements of the national standard (≤3‰), especially for large-area glass of 1.6-2.5 square meters. Second, the glass is prone to deformation during the heating process, and the partial conta...

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Problems solved by technology

[0003] At present, the ultra-thin heat-strengthened glass with a thickness of 1.8-2.2mm mainly has the following problems: First, the flatness of the glass cannot meet the requirements of the national standard (≤3‰), especially for large-area glass of 1.6-2.5 square meters

Second, the glass is easily deformed during the heating process, and the glass is partially in contact with the roller table for too long, resulting in surface abrasion and the formation of "white fog"

Third, due to uneven heating and improper cooling methods, the surface stress of the strengthened glass is uneven, and it is not easy to cut again

The radiant panel is divided into units according to the furnace wires. There are thermal expansion and installation gaps at the joints of the units, which will cause uneven radiation to the glass; and the temperature between each unit is not transmitted.

The glass will be bent and deformed due to uneven heating, and the deformation of the glass will cause local friction with the ceramic roller table, resulting in local abrasion of the glass

Therefore, the existing glass tempering heating process is no longer suitable for strengthening ordinary float glass with a thickness of 1.8-2.2mm

[0005] Second, when the glass is heated, in order to make the glass heated evenly, the upper part of the glass is usually heated by convection, but now the convection in the tempering furnace uses compressed air, the convection of compressed air is high pressure, and the convection pressure is 0.3-0.5Mpa / cm 2 , and there are few convection points, it will cause the phenomenon that the pressure in the center of the convection point is too large, the pressure between two adjacent jet holes and the pressure between two rows of convection tubes is too small, which will make the initial deformation of the thin glass heating more serious, so that it cannot be processed. 1.8-2.2mm glass for tempering

[0006] Third, the cooling method makes the glass strength difficult to control

[0007] Based on the above problems, it is difficult to effectively strengthen glass with a thickness of 1.8-2.2 mm by ordinary ultra-thin heat-strengthened glass manufacturing methods

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