Abstract: The invention relates to a method for bending and tempering a glass sheet, the method comprising: heating a flat glass sheet in a furnace for the purpose of bending and tempering; feeding a flat glass sheet by a transfer conveyor from the furnace onto a bending conveyor, when the bending conveyor is straightened; bending the bending conveyor and the glass sheet to the desired curvature; cooling the glass sheet by air blasts, when the bending conveyor and the glass sheet are at the desired curvature. The transfer conveyor transfers the glass sheet away from the furnace to the bending conveyor in the longitudinal direction of the rollers of the furnace, which is the transverse direction in relation to the direction of movement of the glass sheet in the furnace during heating. The invention also relates to a device applying the method.

Abstract: The invention relates to a method of heating a glass sheet for tempering. It comprises conveying the glass sheet on top of rollers in a roller-hearth furnace, heating the glass sheet in the roller-hearth furnace to a transfer temperature at which the glass sheet is transferred into an air support furnace. The glass sheet, while resting on an air cushion, is carried on an air support table and the glass sheet is heated in the air support furnace to a tempering temperature. The transfer temperature is not lower than 620° C. and not higher than 675° C. and the tempering temperature is not lower than 650° C. and not higher than 720° C.

Abstract: The invention relates to a method of heating a glass sheet for tempering. It comprises conveying the glass sheet on top of rollers in a roller-hearth furnace, heating the glass sheet in the roller-hearth furnace to a transfer temperature at which the glass sheet is transferred into an air support furnace. The glass sheet, while resting on an air cushion, is carried on an air support table and the glass sheet is heated in the air support furnace to a tempering temperature. The transfer temperature is not lower than 620° C. and not higher than 675° C. and the tempering temperature is not lower than 650° C. and not higher than 720° C.

Abstract: An apparatus for conveying glass sheets on an air support table, which is included in a heating furnace and provided with blast apertures and exhaust apertures, and in which the blast apertures are connected to a plenum chamber present underneath the air support table. The exhaust apertures are connected to exhaust passages present inside the table. The exhaust passages have at least one of their ends provided with a gate/gates capable of being opened and closed, by means of which the flow of air from the exhaust passages' ends adjacent to the gate/gates can be completely or partially blocked.

Abstract: An apparatus for conveying glass sheets on an air support table of a heating furnace, the table having blast apertures and exhaust apertures. The blast apertures are connected to a plenum chamber under the air support table. The exhaust apertures are connected to exhaust passages inside the table, the first end of the passages opening into the furnace or being provided with a closable and openable closing gate. The second end of the exhaust passages opens into a suction duct or is provided with a closable and openable barrier gate. The suction duct of the blower is on the opposite side of the air support table to the conveyor which is in contact with the glass. In the suction duct between the exhaust passages and the blower is at least one adjustable bypass gate which is used for adjusting the air support of the glass.

Abstract: A method for tempering substantially flat glass sheets. A glass sheet is heated to a tempering temperature and quenching is conducted by blasting cooling air to both surfaces of the glass sheet. The quenching of a top surface and a bottom surface of the glass sheet's both side lanes is commenced earlier or is performed at the early stage of quenching more effectively than the quenching of a top surface and a bottom surface of the glass sheet's middle lane. As a result, the compressive stress required for a desired tempering degree is established on both surfaces of the side lanes earlier than on both surfaces of the middle lane. In order to achieve this, the cooling air enclosures above and below a glass sheet are provided with a subarea of weakened cooling effect.

Abstract: An apparatus for tempering glass sheets. A glass sheet is heated to a tempering temperature and quenching is conducted by blasting cooling air to both surfaces of the glass sheet. The quenching of a top surface and a bottom surface of the glass sheet's both side lanes is commenced earlier or is performed at the early stage of quenching more effectively than the quenching of a top surface and a bottom surface of the glass sheet's middle lane. As a result, the compressive stress required for a desired tempering degree is established on both surfaces of the side lanes earlier than on both surfaces of the middle lane. In order to achieve this, the cooling air enclosures above and below a glass sheet are provided with a subarea of weakened cooling effect.

Abstract: A method and apparatus for tempering glass sheets. The glass sheets are heated to a tempering temperature in a furnace, in which the glass sheets are moved back and forth while supported upon rolls. The heated glass sheets are fed into a quench unit which is divided into two quenching zones with separately controlled blasting pressures. The glass sheets are driven without stopping through the first quenching zone into the second quenching zone, in which the glass is moved back forth upon the rolls. In the first quenching zone, cooling air is blasted onto glass sheet surfaces with slit nozzles. In the second quenching zone, cooling air is blasted onto glass sheet surfaces with hole-type nozzles.