Method for producing glass or glass ceramic and in particular glass or glass ceramic article

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.