Patent ID: 9731992
Date: 2017-08-15
CPC Classifications: C03B

Claim:
1. A method for heating a glass sheet in a glass tempering furnace having a frame structure comprising a top part and a bottom part which may be moved in relation to each other in the vertical direction of the glass tempering furnace, at least one sealing element adapted for sealing a gap that is formed between the top part and the bottom part when the top part is moved upward in relation to the bottom part, and at least one blowing channel arranged in its top part, the method comprising feeding the glass sheet to the glass tempering furnace, and heating the glass sheet in the glass tempering furnace by at least blowing heating air on the top surface of the glass sheet through said at least one blowing channel, wherein the blowing distance of the heating air from the top surface of the glass sheet is adjusted by changing the distance of the blowing channel from the top surface of the glass sheet, said distance being changed by changing the position of the top part of the glass tempering furnace in relation to its bottom part in the vertical direction of the glass tempering furnace.