Apparatus for manufacturing glass sheet and method for manufacturing glass sheet

Abstract

The present invention relates a device for manufacturing a glass sheet including: a float bath for storing a molten metal; an annealing furnace into which a glass ribbon molded into a plate shape is transferred on the molten metal; a chamber placed between the float bath and the annealing furnace; and a plurality of lift-out rolls that are provided in the chamber and that transfer the glass ribbon into the annealing furnace from the float bath, in which the apparatus includes a first air supply unit that supplies, as a cooling gas, an inactive gas to a space, which is situated downstream with respect to a contact point of the glass ribbon with the most downstream lift-out roll, of a space located below the glass ribbon in the chamber.

Description

technical field [0001] This invention relates to the manufacturing apparatus of a glass plate, and the manufacturing method of a glass plate. Background technique [0002] The float method is known as one of representative manufacturing methods of a glass plate. In the float method, molten glass is continuously supplied to a bath surface of molten metal (for example, molten tin) in a float tank to form a ribbon-shaped glass ribbon. After the glass ribbon is lifted from the bath, it is pulled from the exit of the float tank and conveyed on lift rollers. Next, the glass ribbon is conveyed in the slow cooling furnace, and this glass ribbon is annealed, conveying this glass ribbon on the conveyance roller. Next, the glass ribbon is delivered to the outside of the annealing furnace, and after it is cooled to about room temperature, it is cut into a predetermined size to become a glass sheet as a product. [0003] However, the glass ribbon contacts the outside air between the f...

AI Technical Summary

Problems solved by technology

[0003] However, the glass ribbon is in contact with the outside air between the float tank and the annealing furnace, and is affected by the temperature of the air

As a result, the glass ribbon is deformed, and warpage remains in the product even if the temperature distribution in the annealing furnace is optimized.

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