Method and apparatus for heating glass
AssigneeUniglass Engineering Oy
InventorsJukka Vehmas, Jorma Valkama
Life of this patent
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Abstract
A method and apparatus for heating glass, in which glass (4) is heated upon rollers (3) in a tempering furnace (1) from above and below of the glass (4). At least the upper surface of the glass (4) is heated with hot air jets directed substantially perpendicularly relative to the surface of the glass (4). The air jets have been provided by sucking air mainly from the inside of the furnace and by pressurizing the air taken from the inside of the tempering furnace (1) to an overpressure of over 0.1 bar relative to the pressure in the tempering furnace (1).
Claims8
An apparatus for heating glass, which apparatus comprises a tempering furnace comprising horizontal rollers arranged to support the glass and to form its conveyor;
- and means for sucking air from the inside of the tempering furnace and for circulating the air to be blown back at least onto the upper surface of the glass, comprising a pressurization unit;
- a return pipe of the upper side;
- and blow pipes of the upper side, which blow pipes are arranged in the vicinity of the surface of the glass, whereby the return pipe is arranged to convey air from the tempering furnace to the pressurization unit, and the pressurization unit is arranged to pressurize the air conveyed from the tempering furnace to an overpressure of 0.1 bar relative to the pressure of the tempering furnace, whereby the pressurized air is hot and arranged to be blown through the blow pipes of the upper side substantially perpendicularly onto the upper surface of the glass.
Dependencies are inferred from the claim text.