Method for manufacturing tempered glass plate
A glass plate and tempering technology, used in glass tempering, glass manufacturing equipment, instruments, etc., can solve problems such as measurement that is not suitable for measuring stress, difficult to automate, etc.
Pending Publication Date: 2021-08-24
GLASTON FINLAND
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Problems solved by technology
However, measurements made with this device are difficult to automate, and the use of the device is not suitable for measurements where stress is to be measured from moving glass
Method used
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Embodiment Construction
[0026] image 3 A tempering device according to an embodiment of the present invention is shown. Tempering equipment 20 includes according to image 3 A tempering furnace 1 and a tempering cooling unit 2 are arranged continuously in the traveling direction of the glass plate. image 3 The tempering furnace 1 shown is equipped with horizontally rotating rollers. The rotating rollers form the conveyor line, the so-called roller line. Alternatively, a bench with a suspended air nozzle ( image 3not shown). The tempering equipment is also equipped with a temperature scanner 5 and a pyrometer 8 installed above or below the conveying line between the tempering furnace and the tempering cooling device. The temperature scanner 5 is mounted on the tempering equipment so that the temperature scanner 5 can see through its lens the glass sheet moving on the conveyor line without a mirror. According to a tempering instruction selected on the basis of the characteristics of the glass,...
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A method for tempering a flat glass sheet. The method includes identifying characteristics of the glass sheet; adjusting the temperature of the toughening furnace (1) and / or the heating time of the glass sheet (G) according to the identified characteristics; adjusting the blowing pressure and / or the blowing distance of the air injection of the temperature adjusting unit (2); heating the glass plate in a toughening furnace; measuring the temperature reached by the glass plate from the surface of the glass plate behind the toughening furnace, and cooling the glass plate in a toughening cooling unit. In the method, a change in the thickness direction temperature distribution of the glass sheet during tempering cooling is calculated based on the measured temperature; and calculating a residual stress distribution obtained in the glass sheet during tempering on the basis of the calculated change in the thickness direction temperature distribution. Then the reference variable for the tempering level of the glass plate is selected on the basis of the calculated residual stress distribution, and the selected reference variable is compared with a predetermined threshold value; if the comparison between the reference variable and the threshold value satisfies a predetermined criterion, an alarm is generated and / or it is found that the glass sheet does not comply with the requirements of the safety glass.
Description
technical field [0001] The subject of the invention is a method for tempering glass sheets. Background technique [0002] It is well known to temper glass sheets using a tempering furnace in which the glass sheet is heated to a tempering temperature. On so-called roller conveyors, the glass sheets are moved in one direction or back and forth on rotating ceramic rollers in the tempering furnace. Furnaces equipped with roller conveyors are commonly referred to as roller furnaces and have a typical temperature of, for example, 680°C to 700°C. Glass sheets are moved side by side sequentially from the tempering furnace, or conveyed along roller conveyors in the form of various glass loads of one or more glass sheets to the tempering cooling unit at the rear of the furnace, where tempering cooling is performed with air nozzles. Typically, the air used for cooling is about the same temperature as the air outside or inside the plant. A blower or compressor is used to supply cooli...
Claims
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Login to View More IPC IPC(8): C03B27/012G01L5/00
CPCC03B27/012G01L5/0047
Inventor A·阿罗宁M·兰塔拉
Owner GLASTON FINLAND