Patent ID: 8516851

Claim:
A method for producing glass ceramic articles, comprising: producing an initial glass body ( 11 ), wherein the production of the initial glass body ( 11 ) comprises fining the initial glass body with a fining agent that is also found in the glass ceramic articles after ceramization, and wherein fining the initial glass body results in a substantially bubble-free initial glass body, mounting the initial glass body ( 11 ) on a gas cushion ( 13 ), wherein the gas cushion is between a levitation support ( 1 ) and the initial glass body ( 11 ), and at least partially ceramizing the initial glass body ( 11 ) on the levitation support ( 1 ), wherein the levitation support has at least one diaphragm with a continuous surface region ( 3 ) with at least one gas feed region ( 151 , 152 , 153 ) where levitation gas for the gas cushion ( 13 ) is fed out from the levitation support, and at least one gas discharge region ( 171 172 , 173 ) where gas from the gas cushion ( 13 ) is at least partially discharged into the levitation support, wherein the levitation gas is supplied via a gas feed chamber ( 51 - 53 ) and discharged via a gas discharge chamber ( 71 - 73 ), which respectively comprise closed channels that extend in a direction along a bearing surface inside the levitation support, and wherein the levitation gas is supplied through an antechamber ( 6 ) arranged below the levitation support ( 1 ) to the gas feed chamber ( 51 - 53 ) via a gas-permeable connection in the form of a channel ( 96 ) provided on the lower side of the pas feed chamber ( 51 , 52 , 53 ) and having a cross section, which in comparison with the gas feed chamber ( 51 - 53 ) is smaller.