Patent ID: 9567251
Date: 2017-02-14
CPC Classifications: C03B

Claim:
1. A method for heating glass sheets, the method comprising: feeding a glass sheet through a tempering furnace in which the glass sheet is heated both from above and below, wherein: the glass sheet is heated by means of a plurality of blowing channels, the longitudinal axes of which are arranged in the substantially transverse direction in relation to the direction of travel of the glass sheet and by means of heating resistor rows arranged in the substantially transverse direction in relation to the direction of travel of the glass sheet, wherein the plurality of blowing channels are positioned sequentially adjacent to each other in the direction of travel of the glass sheet, the heating resistor rows having at least three separately controllable parts, the heating resistor rows being arranged in the plurality of blowing channels to heat the air being blown, the plurality of blowing channels comprising a blow part that includes the heating resistor rows, the plurality of blowing channels being divided into compartments according to the separately controllable parts, such that the plurality of blowing channels are aligned with the at least three separately controllable parts, and such that the plurality of blowing channels are configured to blow heated air onto the glass sheet, the temperature profile of the glass sheet is adjusted in the transverse direction by separately adjusting the different parts of the heating resistor row, and the heating means further comprises an air feeding channel configured for supplying air to each of the compartments.