Schott Glaswerke

Schott Glas

Schott Ag

Jenaer Glaswerk Schott & Gen.

Other

Kernforschungsanlage Julich

Werner Kiefer

Uwe Kolberg

Wolfgang Schmidbauer

Erich Rodek

Hildegard R&ouml;mer

Guido R&auml;ke

Karin Naumann

Maria Sura

Friedrich Siebers

Peter Brix

Frank-Thomas Lentes

Thomas Pfeiffer

Christian Kunert

Norbert Greulich-Hickmann

Volker Ohmstede

Günter Weidmann

Hildegard Römer

Michael Kohl

Roland LeRoux

Hilgegard Römer

Wolfgang Schmid-Bauer

Simone Monika Ritter

Christian Wandrey

Peter Nass

Michael Leister

Werner Sack

Nanning J Arfsten

Wolfgang Pannhorst

Guido Räke

Alexander Aivasidis

Walter Trosch

Norbert Greulich

Stefan Schmitt

Hildegard Roemer

Wolfgang Schmidtbauer

Veronika Rehm

Detlef K&ouml;psel

Karlheinz Lohmann

Hans Durolf

Hartmut Hegeler

Rolf Bruckner

Christian Reich

Gerhard Nuessle

Klaus Stetter

Detlef Köpsel

A device for the refining of a glass melt at high temperatures according to the skull pot principle is provided. The device includes a skull crucible having walls that are constructed from a plurality of pipes, a high-frequency coil for coupling electrical energy into the contents of the skull crucible, and an inlet and an outlet of the skull crucible being arranged in a melt surface region of the glass melt, wherein the inlet and the outlet are essentially arranged lying opposite one another.

Method and a device for the refining of glass

A method for melting inorganic materials, preferably glasses and glass-ceramics, in a melting unit with cooled walls is provided. The method includes selecting the temperature of at least one region of the melt is selected in such a way as to be in a range from T&#x2212;20% to T+20%, where the temperature Tis given by the temperature at which the energy consumption per unit weight of the material to be melted is at a minimum, with the throughput having been selected in such a way as to be suitably adapted to the required residence time.

Melting and refining in tanks with cooled walls

A method for the refining of glass by means of high temperatures in a skull crucible is provided. The method includes introducing a glass melt in the skull crucible through an inlet disposed at an upper region of the skull crucible, heating the skull crucible by irradiation of high-frequency energy, and discharging the glass melt from the skull crucible through an outlet disposed at the upper region, the outlet being disposed at a place essentially lying opposite the inlet.

Method for the refining of glass

The invention relates to a method and a device for producing colored glasses. The aim of the invention is to obtain a paricularly intimate mixture and to enable a quick change of the melt at the same time. To this end, the following procedure steps are applied: a melt made of a compound or fragments of glass is produced, the glass melt is further processed in at least one additional vessel, the melt is supplied to a skull device () (skull pot or skull channel) during subsequent processing, a dye is supplied () to the melt after the melt was in the melting station () but before the melt enters the skull device () or while said melt is in the skull device.

Method and device for producing colored glasses

A structural component for a device for the treatment of melts, especially of glass melts, having a base body of metal or of a metal alloy and a cooling system in which a cooling medium is led through the structural component for the leading-off of heat. The base body is provided with a coating of a material the decomposition temperature of which lies below the temperature of the melt, and the cooling system is designed and arranged in such manner that the temperature of the boundary layer of the melt that immediately surrounds the structural component lies below the decomposition temperature of the coating material.

Coating of cooled devices

This invention relates to a device and a process for introducing gases into a hot medium, whereby device () contains a pipe () for introducing gas and a cooling jacket () that encases pipe ().

Device and process for introducing gases into a hot medium

The invention relates to a skull pot for melting or refining glass or glass ceramics, comprising a pot wall ( ), a pot base, and an induction coil ( ) which surrounds said pot wall and through which high-frequency energy can be coupled into the contents of the pot. The pot wall is made up of a ring of metal pipes ( ) which can be connected to a cooling medium, slot-type intermediate chambers being provided between adjacent metal pipes. The pot base has a run-off for the melt. The metal pipes ( ) that form the pot wall ( ) arm short-circuited with each other above the base in order to increase the degree of efficiency of the skull pot and especially, in order to even out the temperature profile of the melt throughout the depth of the melt.

Skull pot for melting or refining glass or glass ceramics

Process for the melting, refining and homogenizing of glass melts

The invention describes a method for refining molten glass materials, in which refining gas is generated by refining agents in the molten glass, and in which the molten glass is heated to a temperature of between 1650&deg; C. and 2800&deg; C., and the maximum release of refining gas by the refining agents takes place at over 1500&deg; C.

Method for refining molten glass

The silicate glass has a composition (in % by weight, based on oxide) of SiO , 54-72; Al O , 0.5-7; ZrO , 10-20; B O , 0-<5; Na O, 3-<8; K O, 0-5; with Na O&plus;K O, 2-<8; CaO, 3-11; MgO, 0-10; SrO, 0-8; BaO, 0&prop;10; with CaO&plus;MgO&plus;SrO&plus;BaO, >5-24; La O , 0-5; and TiO , 0-4. The glass also contains at least 0.6 percent by weight of La O or at least 0.1 percent by weight TiO . The glass has a hydrolytic resistance in hydrolytic glass 1, an acid resistance in acid class 3 or better, preferably acid class 1, a caustic lye resistance in lye class 1, a glass transition temperature (T ) of at least 650&deg; C., a thermal expansion coefficient (&agr; ) of 4.1&times;10 to 7.4&times;10 /K, a refractive index (n ) of 1.53 to 1.63, an Abb&eacute; number (&ngr; ) of 48 to 58 and a negative anomalous partial dispersion in a blue spectral region (&Dgr;P ) of up to &minus;0.0130.

Glass with high proportion of zirconium-oxide and its uses

The silicate glass has a composition (in % by weight, based on oxide) of SiO , 54-72; Al O , 0.5-7; ZrO , >10-<18; B O , 0-<5; Na O, 2-<10; K O 0-5; with Na O&plus;K O, 2-<10; caO, 3-11; MgO, 0-10; SrO, 0-8; BaO, 0-12; with CaO&plus;MgO&plus;SrO&plus;BaO, >5-24; La O , 0-6; and TiO , 0-4. The glass has at least 0.6% by weight of La O or at least 0.1% by weight TiO . The glass is in hydrolytic glass 1, acid class 3 or better, preferably acid class 1, and lye class 1. It has a glass transition temperature (T ) of at least 640&deg; C., a thermal expansion coefficient (&agr; ) of 4.1&times;10 to 8.0&times;10 /K, a refractive index (n ) of 1.53 to 1.63, an Abb&eacute; number (&ngr; ) of 47 to 66 and a negative anomalous partial dispersion in a blue spectral region (&Dgr;P ) of up to &minus;0.0130.

A device and method for the plaining of glasses or glass-ceramics. The device is provided with a melting vat, at least two plaining containers serially connected after the outlet of the melting vat, and at least one of the plaining containers is built in accordance with the skull principle from a plurality of metal tubes comprising a cooling agent connection and a high-frequency device for inductively coupling high-frequency energy into the contents of the plaining container.

Device and method of plaining glasses or glass-ceramics

According to the invention, the skull pot is provided with the following characteristics: a pot wall ( ), a bottom ( ) and an induction coil ( ) which surrounds the pot wall ( ) and by means of which high-frequency energy can be coupled into the contents of the pot. The pot wall ( ) is made of a ring of metal pipes ( ) which can be connected to a cooling medium. Slits are embodied between adjacent metal pipes ( ). The metal pipes ( ) are bent at a right angle at the upper ends thereof in such a way that said pipes extend towards the outside, when the pot wall ( ) is viewed from above, and form a collar ( ). The collar ( ) is surrounded by an additional wall (upper wall ). The upper edge of said wall is situated on a higher level than the collar ( ) in such a way that the melt covers the collar ( ) during operation.

Skull pot for melting or refining inorganic substances

A high-frequency device for melting and refining inorganic compounds having a high-frequency oscillation system and a crucible. The high-frequency system includes an induction coil looping around the crucible and at least two oscillator circuits connectable in parallel to the induction coil and providing redundant high frequency energy. Each self-exciting oscillator includes one of the capacitors and the induction coil. The device may further include a power supply, a control cabinet having operating units, and a process control system.

Device for melting and/or refining inorganic compounds

Hard glass fire retardant glasses can be tempered in a conventional air tempering plant having heat transmission values of approximately 200-500 W/(m.sup.2 .times.K) yielding in the tempered state a fire resistance period of at least 30 minutes according to DIN 4102 and the safety properties according to DIN 1249 (safe break). In order to achieve the combination of fire resistance period and safety properties, the glasses must have a coefficient of thermal expansion .alpha..sub.20/300 of between 3 and 6.times.10.sup.-6 K.sup.-1, a specific thermal stress .phi. of between 0.3 and 0.5 N/(mm.sup.2 .times.K), a glass transition temperature Tg of between 535.degree. and 850.degree. C., a product of specific thermal stress .phi. multiplied by (Tg -20.degree. C.) of between 180 and 360 N/mm.sup.2, an upper annealing temperature (temperature at a viscosity of 10.sup.13 dpas) of over 560.degree. C., a softening temperature (temperature at a viscosity of 107.sup.7.6 dpas) of over 830.degree. C. and a working temperature (temperature at a viscosity of 10.sup.4 dpas) of below 1300.degree. C.

Fire retardant safety glass

Growing community of inventors

Mainz, Germany

Werner Kiefer