Design method of glass substrate overflow forming annealing device

Abstract

The invention provides a design method of a glass substrate overflow forming annealing device. Glass substrate annealing is divided into six basic fluid characteristics including a free-flowing melt, a high-viscosity plastic body, an elastic plastic body, an elastic body initial state, a transition complete elastic body, a complete elastic body and the like. Glass is cooled to normal temperature from a molten state, the continuous gradual change rule of the physical characteristics of the glass is the unique basis of the annealing theory, parameters of substrate glass in a forming annealing device determined through production line design and temperature parameters determined according to a viscosity-temperature characteristic curve of a glass substrate material are divided into different sections respectively, the annealing speed h0 of the glass substrate, the traction speed PR of the glass substrate, the length L delta of a thickness forming area in a forming annealing device, the length L1 of a pre-annealing area, the length L2 of a soaking area, the length L3 of an annealing area, the length L4 of a subsequent annealing area and the total length LW of the forming annealing device are calculated; and the design of the overflow forming annealing device with higher accuracy, higher efficiency and lower cost is realized.

Description

technical field [0001] The invention relates to the field of glass substrate manufacturing, in particular to a method for designing a glass substrate overflow forming annealing device. Background technique [0002] The glass substrates used in the production of flat panel displays such as TFT-LCD (Thin Film Transistor Display) and PDP (Plasma Display Panel) are manufactured by overflow down-drawing. In the forming process, molten glass melted by a glass melting furnace is supplied to Melt overflow down-draw molding device to manufacture. The control of glass substrate thickness uniformity, residual stress and warpage is one of the most important process technologies, and they are all related to the design and process control of the overflow forming annealing device. There is no thermal stress in the glass substrate annealing from the beginning, but there is a considerable temperature gradient (especially for flat glass). The role of the soaking zone is to minimize this tem...

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Problems solved by technology

[0009] Aiming at the problem that the design of the glass annealing furnace in the prior art has misunderstandings in the traditional theory, the present invention provides a design method for the overflow forming annealing device of the glass substrate, which overcomes the Misunderstandings of traditional theory, to achieve more accurate, more efficient, and lower-cost annealing of overflow molding, especially suitable for the fine design of large-capacity (lead-out), wide-width, and thin glass substrate molding annealing devices, and also suitable for Fine design of performance for LTPS glass substrate forming annealing device

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