Schott Ag

Schott Glaswerke

Schott Glas

Gernot Roeth

Thomas Pfeiffer

Andreas Roters

Klaus-Dieter Duch

Gerhard Lautenschlaeger

Friedrich G Baucke

Olaf Claussen

Ralf-Dieter Werner

Patrick Hoyer

Fritz Kraemer

Franzo Ott

Knut Jakobi

Ottmar Schuessler

The device for manufacturing glass, in which bubble formation on precious metal components is prevented, has a precious or refractory metal wall () at least partially surrounding a glass melt from which the glass is made, a first electrode pair () for measuring oxygen partial pressure at an interface between the glass melt and the wall to obtain an actual value, a second electrode pair () for measuring an oxygen partial pressure in the glass melt to obtain a set point value and a regulating system () for adjusting the oxygen partial pressure at the interface according to a comparison between the actual value and the set point value, so that the oxygen partial pressure at the interface is within a safe range.

Device and method for manufacturing glass without forming bubbles on precious metal components

The float glass apparatus has a glass melt producing unit including a melting tank and a refining tank for the glass melt, a float tank including a metallic basin and metal bath contained in the basin, conducting devices for conducting the glass melt from the glass melt producing unit to the metal bath and auxiliary devices as needed. In order to minimize bubble defects and extend service life of apparatus parts made from platinum or a platinum alloy, the apparatus includes a device for minimizing direct current flowing between the glass melt producing unit and the float tank, which includes an auxiliary electrode connected with ground and located in the glass melt producing unit in electrical contact with the glass melt and a direct electrical connection between the metallic basin of the float tank and ground.

Device for electrically grounding a float glass production apparatus

In the case of a method for manufacturing glass, with which molten glass is enclosed at least partially by precious metal walls or refractory metal walls, and with which the oxygen partial pressure of the molten glass is influenced by a treatment means to prevent disturbances, gas bubbles or other disturbances often form as a result of over-compensation. This over-compensation can be prevented by locating at least one probe () for determining the oxygen partial pressure at the interface&#x2014;or close to the interface&#x2014;of the glass melt and metal wall, and by regulating the influencing of the oxygen partial pressure in a safe range of the oxygen partial pressure with the treatment means using a regulating system ().

Method for preventing bubbles on precious metal components

In the method of making glass a glass melt is formed from starting materials in a melt apparatus, which includes at least one metal part having a metal surface in contact with the glass melt in a first region of the glass melt having a predetermined oxygen partial pressure. This method includes suppressing oxygen bubble formation in the glass melt at a contacting surface between the metal surface and the glass melt; immersing an electrode in a second region of the glass melt not including the first region, which has a lower oxygen partial pressure than in the first region, and electrically conductively connecting the electrode and the at least one metal part. An apparatus for performing the method is also described as well as glasses made by the method.

Method and apparatus for suppressing oxygen bubble formation in glass melts

An apparatus for making glass in which a glass melt is refined in a vessel with oxygen is described. It includes a melt-containing vessel ( ) having a refining region ( ) for refinement of the glass melt and a noble metal member for producing oxygen in the melt. The noble metal member ( ) has an outer side facing the glass melt and an inner side facing away from the glass melt washed with and acted on with oxygen. Oxygen-containing bubbles are vigorously generated on the outer side of the noble metal member facing the glass melt when the inner side is washed with the oxygen.

Method and apparatus for oxygen refinement of a glass melt

The invention relates to a measuring device to measure the oxygen partial pressure, in particular, glass melts, comprising a platinum measuring electrode and a reference electrode arrangement. The reference electrode arrangement is placed in an outer pipe and contains a platinum reference electrode. The electrode protrudes into an oxygen-conducting solid electrolyte, through which an oxygen-containing reference gas flows. For ion-conducting contact with the melt, a rod-shaped contact element of oxygen-ion conducting material is inserted into the open lower end of the outer pipe. This contact element is immersed in the melt. To prevent the inflow of environmental vapors into the measuring space through leaks at this connecting point, the actual measuring arrangement is placed in a liner pipe of oxygen-ion conducting material whose lower end is in ion-conducting contact with the contact element by way of an oxygen-ion conducting powdered material. Additionally, the annular space around the liner pipe can be separated from the interior of the liner pipe, and a flow of inert gas can be provided through the annular space via gas inlet and outlet connections.

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Dalheim, Germany

Gernot Roeth