Avanstrate Inc.

Avanstrate Korea Inc.

Hiroyuki Kariya

Nobuhiro Maeda

Mikio Kimori

Kimihiko Nakashima

Takayuki Shimizu

The method for producing a glass sheet by down-drawing includes an air pressure controlling step of controlling the air pressure of a furnace outside space formed between a furnace and a covering part that covers the furnace, the furnace including a forming furnace and a lehr, a melting step of melting glass raw materials to form molten glass, a supplying step of supplying the molten glass to a forming cell disposed inside the forming furnace, a forming step of forming a glass sheet by allowing the molten glass to flow down the forming cell, an annealing step of cooling the glass sheet while allowing the glass sheet to flow in one direction in the lehr, and a cutting step of cutting the glass sheet that has been cooled. In the air pressure controlling step, air pressure is controlled such that the air pressure is higher, inside the furnace outside space, at a position more toward the upstream side of the flow direction of the glass sheet.

Method and apparatus for making glass sheet

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.

Glass-substrate manufacturing method

A glass-plate manufacturing method employing a down-draw process includes: a forming step of forming a sheet glass by making a molten glass flow downward along opposite side surfaces of a forming member and merge at a lower section of the forming member; and a cooling step of cooling the sheet glass while drawing the sheet glass downward with rollers. In the cooling step, an above-glass-strain-point temperature control step is performed which is a step of performing a temperature control in the width direction of the sheet glass in a temperature region ranging from the lower section of the forming member to where the temperature of the sheet glass falls below a temperature region near the glass strain point, and includes: first, second and third temperature control steps as defined herein.

Glass-plate manufacturing method

A glass-substrate manufacturing method according to an aspect of the invention is a method for manufacturing glass substrates by employing a down-draw process. In down-draw processing, a molten glass is made to overflow from a forming member and formed into a sheet glass and the sheet glass is then cooled while being drawn in a downward-flow direction. In this glass-substrate manufacturing method, after the sheet glass has separated from the forming member and when the temperature of the sheet glass is within a temperature region ranging from a temperature higher than the softening point to a temperature near the annealing point, the sheet glass is cooled by maintaining the viscosity of side sections of the sheet glass within a range of 10-10poise while applying a tension toward the side sections.

Glass-substrate manufacturing method and glass-substrate manufacturing device

A method of manufacturing a glass sheet according to the present invention comprises the steps of creating split flows of molten glass in a forming bodyand causing the molten glass to flow down, subsequently merging the flows at a merging point to form a glass sheet G and causing the glass sheet to flow downward in the vertical direction. In this method of manufacturing a glass sheet, a partition memberis disposed facing the glass sheet G in the vicinity of a location below the forming body, and a facing surface of the partition memberis shaped so as to correspond to a sheet thickness variation of the glass sheet G, so that a gap between the glass sheet G and the partition memberis substantially uniform.

Method of manufacturing glass sheet

A method of manufacturing a glass sheet includes creating split flows of molten glass in a forming body () and causing the molten glass to flow down, subsequently merging the flows at a merging point to form a glass sheet G and causing the glass sheet to flow downward in the vertical direction. A plurality of chambers (, . . . ) separated by heat-insulating plates (, . . . ) in the direction of movement of the glass sheet G are provided. A heater (, . . . ) is provided for each of the chambers (, . . . ) so that the temperature decreases in the direction of movement. The heat-insulating plates (, . . . ) are disposed facing the glass sheet G, and facing surfaces of the heat-insulating plates (, . . . ) are shaped so as to correspond to a sheet thickness variation of the glass sheet G.

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Yokkaichi, Japan

Hiroyuki Kariya