Temperature control method for molding equipment used in glass substrate production

Abstract

The invention discloses a temperature control method for molding equipment used in glass substrate production. The temperature control method adopts an excess flow device for changing a flowing direction and distribution of a glass liquid, a housing for supporting the excess flow device and a cooling device for cooling the housing of the excess flow device. Through utilizing a cooling system at middle and upper areas of the housing of the molding equipment to adjust the upper-low temperature difference of the excess flow device and middle and upper temperatures of the excess flow device in a molding process, the temperature control method improves a service life of the excess flow device and the molding quality of a liquid crystal glass substrate.

Description

Technical field: [0001] The patent of the invention belongs to the field of flat glass manufacturing, and belongs to a temperature field mode of a muffle furnace in a forming equipment. Background technique: [0002] The flow down-draw method (melting down-draw method) is a method of producing glass sheets in glass preparation technology. Compared to other processes, such as float and slot-draw processes, the overflow down-draw process produces glass sheets with superior flat and smooth surfaces without the use of secondary forming processes (grinding, polishing, etc.). [0003] In an exemplary fusion downdraw process, glass melt is supplied to a trough formed in a refractory overflow. The molten glass overflows the top of the trough on either side of the overflow to form two half sheets of glass that flow down and then down the outer surface of the overflow. The two sheets meet at the bottom or root of the overflow where they fuse together to form a single glass sheet. T...

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Problems solved by technology

[0006] The disadvantage of the overflow down-draw method is that there are limited means to control the parameters related to the thickness, stress and surface flatness of the formed glass sheet

[0007] The disadvantage of the overflow down-draw method is that the temperature difference between the upper and lower parts of the forming device must be controlled within a certain range due to the high temperature environment in the forming equipment, the material of the forming device itself and the requirements for glass plate forming.

[0008] The disadvantage of the overflow down-draw method is that when the air is heated and rises, when the bottom of the overflow device is heated, the temperature of the upper part of the overflow device will rise simultaneously, and this rise will have a negative impact on the temperature field in the forming area.

[0009] The disadvantage of the overflow pull-down method is that because the air rises after heating, when the bottom of the overflow device is heated, the temperature of the upper part of the overflow device rises synchronously. After the time changes, the temperature difference between the upper part and the lower part of the overflow device will be formed If it is too large, the thermal expansion internal stress of the overflow device will be too large, which will seriously affect the life of the overflow device

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