A glass-substrate manufacturing method which includes a forming step and a cooling step. In the forming step, a molten glass is formed into a sheet glass by a down-draw process. In the cooling step, the sheet glass is cooled. The cooling step includes first, second and third coating steps as defined herein.

A glass-substrate manufacturing method which includes a forming step and a cooling step. In the forming step, a molten glass is formed into a sheet glass by a down-draw process. In the cooling step, the sheet glass is cooled. The cooling step includes first, second and third coating steps as defined herein.

Provided is a method for producing a glass substrate that can reduce the dimensional change during heat treatment while avoiding shortening of facilities' service lives. A method for producing a glass substrate includes melting and forming a glass raw material to produce a glass substrate having a strain point of 690 to 750 C., wherein an average cooling rate in a temperature range from (an annealing point plus 150 C.) to (the annealing point minus 200 C.) in a cooling process during the forming is adjusted to 100 to 400 C./min to obtain the glass substrate having a degree of thermal contraction of 15 ppm or less when subjected to a heat treatment at 500 C. for an hour.

Provided is a method for producing a glass substrate that can reduce the dimensional change during heat treatment while avoiding shortening of facilities' service lives. A method for producing a glass substrate includes melting and forming a glass raw material to produce a glass substrate having a strain point of 690 to 750 C., wherein an average cooling rate in a temperature range from (an annealing point plus 150 C.) to (the annealing point minus 200 C.) in a cooling process during the forming is adjusted to 100 to 400 C./min to obtain the glass substrate having a degree of thermal contraction of 15 ppm or less when subjected to a heat treatment at 500 C. for an hour.

Provided is a method and an apparatus for transverse temperature distribution design of forming and annealing to enhance a draw rate, which relates to the technical field of glass substrate manufacturing. The method includes dividing a forming and annealing process of a glass substrate into an overflow zone, a thickness forming zone, a pre-annealing zone, a soaking zone, an annealing zone, and a subsequent annealing zone based on six physical flow characteristics of glass in an overflow forming annealing zone. Meanwhile, differentiated transverse temperature distribution strategies are adopted in different temperature control zones to achieve precise control over the transverse temperature distribution design for glass forming and annealing. Additionally, the mechanism involved in the glass annealing process is deeply analyzed using temperature difference-structural difference-thermal stress, providing a more scientific and reasonable method for the warpage size and curved shape of glass after annealing and cooling to room temperature. It is particularly suitable for the temperature distribution design of the forming and annealing zone of glass substrates with a large draw rate, a wide plate width, and a thin profile.

Provided is a method and an apparatus for transverse temperature distribution design of forming and annealing to enhance a draw rate, which relates to the technical field of glass substrate manufacturing. The method includes dividing a forming and annealing process of a glass substrate into an overflow zone, a thickness forming zone, a pre-annealing zone, a soaking zone, an annealing zone, and a subsequent annealing zone based on six physical flow characteristics of glass in an overflow forming annealing zone. Meanwhile, differentiated transverse temperature distribution strategies are adopted in different temperature control zones to achieve precise control over the transverse temperature distribution design for glass forming and annealing. Additionally, the mechanism involved in the glass annealing process is deeply analyzed using temperature difference-structural difference-thermal stress, providing a more scientific and reasonable method for the warpage size and curved shape of glass after annealing and cooling to room temperature. It is particularly suitable for the temperature distribution design of the forming and annealing zone of glass substrates with a large draw rate, a wide plate width, and a thin profile.