Abstract: A glass container is provided that includes a tube, a circular bottom, and a longitudinal axis. A curved glass heel extends from an outer end the bottom to the first end of the tube. The outer surface has a topography defined by a function ?(x) that is an azimuthal average of a distance between a contact plane and the outer surface at any given position located on a circle having the centre and the radius |x|. The values ? for ?(x) are determined for a plurality of circles the radius of which increases stepwise by 500 ?m starting with a circle around the centre having a radius of 500 ?m. The values ? are determined in a range from x=?0.4×d2/2 to x=+0.4×d2/2, d2 having a size such that at least 4 values ? are determined and can be fitted with a curvature function h ^ ? ( x ) = - c × x 2 1 + 1 - c 2 × x 2 + h 0 .

Abstract: A process for preparing a glass container that includes: providing a glass tube with a first portion, a second portion, and a longitudinal axis (Ltube); holding the first portion in a first clamping chuck and the second portion in a second clamping chuck; rotating the glass tube around the longitudinal axis (Ltube); heating, via a heater, the glass tube above a glass transition temperature; separating the first and second portions from one another by pulling apart along the longitudinal axis (Ltube) while the heated glass tube is still rotating by moving the first and the second chucks away from each other; and moving the heater, while moving the first and second chucks away from each other, so that the heater follows a mass that remains at a circular end region of the first and/or second portion.

Abstract: A glass container is provided that includes a tube, a circular bottom, and a longitudinal axis. A curved glass heel extends from an outer end the bottom to the first end of the tube. The two-dimensional distance h(x,y) between a contact plane and the outer surface. The two-dimensional distance is measured in a direction parallel to the axis. The slope magnitude of the outer surface at the given position x,y is given by ?{square root over ((dh/dx)2+(dh/dy)2)}. The 75% quantile of values that have been determined for the term ?{square root over ((dh/dx)2+(dh/dy)2)}×d1/h(xy)delta for all given positions x,y within a circular area having a radius of 0.4×d2/2 and that correspond to the centre is less than 4100 ?m/mm. The adjacent positions x,y increase stepwise by 200 ?m, and h(x,y)delta=h(x,y)max?h(x,y)min, h(x,y)max is a maximum value for h(x,y) and h(x,y)min is a minimum value for h(x,y) being determined in that circular area.

Abstract: A method and an apparatus for melting down glass are provided. The method includes using microwave radiation for at least part of the energy supply for melting for transforming a batch into a glass melt. The microwave radiation captures at least part of the transition between batch and primary melt. The method and apparatus include melting assembly with a melting tank which has walls within which both the batch for melting and the molten batch can be accommodated as a glass melt, where above the batch and above the glass melt there is at least one microwave-emitting source disposed.

Abstract: An optical converter wheel, a method of producing, and a method of using are provided. The wheel includes an inorganic converter material that converts light of a first wavelength into light of a second wavelength and a converter substrate. The converter substrate has a coefficient of thermal expansion CTEKS of 4 to 18×10?6 1/K in a range from 20° C.-300° C. and a thermal conductivity of at least 50 W/mK at 20° C.

Abstract: A glass container is provided that includes a tube, a circular bottom, and a longitudinal axis. A curved glass heel extends from an outer end the bottom to the first end of the tube. The two-dimensional distance h(x,y) between a contact plane and the outer surface. The two-dimensional distance is measured in a direction parallel to the axis. The slope magnitude of the outer surface at the given position x,y is given by ?{square root over ((dh/dx)2+(dh/dy)2)}. The 75% quantile of values that have been determined for the term ?{square root over ((dh/dx)2+(dh/dy)2)}×d1/h(xy)delta for all given positions x,y within a circular area having a radius of 0.4×d2/2 and that correspond to the centre is less than 4100 ?m/mm. The adjacent positions x,y increase stepwise by 200 ?m, and h(x,y)delta=h(x,y)max?h(x,y)min, h(x,y)max is a maximum value for h(x,y) and h(x,y)min is a minimum value for h(x,y) being determined in that circular area.

Abstract: A process for preparing a glass container that includes: providing a glass tube with a first portion, a second portion, and a longitudinal axis (Ltube); holding the first portion in a first clamping chuck and the second portion in a second clamping chuck; rotating the glass tube around the longitudinal axis (Ltube); heating, via a heater, the glass tube above a glass transition temperature; separating the first and second portions from one another by pulling apart along the longitudinal axis (Ltube) while the heated glass tube is still rotating by moving the first and the second chucks away from each other; and moving the heater, while moving the first and second chucks away from each other, so that the heater follows a mass that remains at a circular end region of the first and/or second portion.

Abstract: A glass container is provided that includes a tube, a circular bottom, and a longitudinal axis. A curved glass heel extends from an outer end the bottom to the first end of the tube. The outer surface has a topography defined by a function ?(x) that is an azimuthal average of a distance between a contact plane and the outer surface at any given position located on a circle having the centre and the radius |x|. The values ? for ?(x) are determined for a plurality of circles the radius of which increases stepwise by 500 ?m starting with a circle around the centre having a radius of 500 ?m. The values ? are determined in a range from x=?0.4×d2/2 to x=+0.4×d2/2, d2 having a size such that at least 4 values ? are determined and can be fitted with a curvature function h ^ ? ( x ) = - c × x 2 1 + 1 - c 2 × x 2 + h 0 .

Abstract: An optical converter wheel, a method of producing, and a method of using are provided. The wheel includes an inorganic converter material that converts light of a first wavelength into light of a second wavelength and a converter substrate. The converter substrate has a coefficient of thermal expansion CTEKS of 4 to 18×10?6 1/K in a range from 20° C.-300° C. and a thermal conductivity of at least 50 W/mK at 20° C.

Abstract: An apparatus and a method for producing glass products from a glass melt, avoiding bubble formation, are disclosed, wherein the apparatus includes a crucible and an internally component for processing the glass melt, and wherein, for heating the glass melt, the apparatus comprises an AC generator which energizes the crucible or stirring crucible via electrical connection elements. The component or stirring system is connected via a current-limiting choke having a variable impedance with the power supply elements. The impedance of the current-limiting choke is adjusted so that a AC density existing in the glass melt lies between a lower limit value and an upper limit value. By means of a choke and by adjusting the impedance it can be achieved that the AC load of the system can be minimized and that simultaneously the water decomposition reaction at the precious metal surfaces can positively be influenced.

Abstract: An apparatus and a method for producing glass products from a glass melt, avoiding bubble formation, are disclosed, wherein the apparatus includes a crucible and an internally component for processing the glass melt, and wherein, for heating the glass melt, the apparatus comprises an AC generator which energizes the crucible or stirring crucible via electrical connection elements. The component or stirring system is connected via a current-limiting choke having a variable impedance with the power supply elements. The impedance of the current-limiting choke is adjusted so that a AC density existing in the glass melt lies between a lower limit value and an upper limit value. By means of a choke and by adjusting the impedance it can be achieved that the AC load of the system can be minimized and that simultaneously the water decomposition reaction at the precious metal surfaces can positively be influenced.

Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: A heating apparatus for the conductive heating of melts, in particular for the rapid melting-down, refining and/or conditioning of melts, is provided. The heating apparatus includes at least one electrode, as well as a first cooling system with a cooling power, which can be set and/or controlled variably.

Abstract: 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.

Abstract: A method and an apparatus for heating a melt in a melting vessel with cooled walls is provided. The melt is heated conductively by current flowing between at least two cooled electrodes, which each replace part of the wall of the melting vessel.

Abstract: A heating apparatus for the conductive heating of melts, in particular for the rapid melting-down, refining and/or conditioning of melts, is provided. The heating apparatus includes at least one electrode, as well as a first cooling system with a cooling power, which can be set and/or controlled variably.

Abstract: This invention relates to a device for melting or refining glass or glass ceramics. According to the invention, such a device is provided with the following characteristics: a channel which is arranged in an essentially horizontal manner and which is provided with an inlet and an outlet for the glass melt; and an HF coil for coupling HF energy into the melt is allocated to the channel. The channel is made of a plurality of metal pipes in a similar way to a skull pot. Said pipes can be connected to a cooling medium.

Abstract: The invention relates to a method and a device for refining a glass melt according to the skull pot principle. According to the invention, the inlet and outlet are located in the upper area of the crucible and lie diametrically opposite each other.