Schott Ag

Schott Glas

Dieter Schoenig

Dietmar Wennemann

Monica Cotlear De Witzmann

Friedrich Siebers

Martin Taplan

Wolfgang Schmidbauer

Herwig Scheidler

Torsten Gabelmann

Angelina Milanovska

Ioannis Kosmas

Friedrich-Georg Schroeder

Daniela Petto

Evelin Weiss

Peter Nass

Susanne Rapp

The method produces a reshaped glass-ceramic article by forced reshaping of a flat green glass part during a ceramicizing process with temporarily lowered viscosity due to crystallization heat. To perform the forced reshaping economically the forced reshaping takes place in a continuous oven for ceramicizing and in an oven section in which the viscosity of the green glass part is temporarily lowered as a result of crystallization heat. An apparatus for performing the process is provided in the continuous oven including different active reshaping devices and/or a hollow mold. The method produces glass-ceramic articles with undamaged surfaces corresponding to surfaces produced during the making of the green glass part (smooth or structured, e.g. knobbed).

Method for reshaping glass-ceramic articles, apparatus for performing the method and glass-ceramic articles made thereby

The apparatus performs a forced reshaping of a flat green glass part during a ceramicizing process in which the viscosity of the glass is temporarily lowered due to crystallization heat. The apparatus includes a continuous furnace () for the ceramicizing process: a reshaping device (') provided with activating openings (); and vertically movable pressure-operated reshaping tools () arranged in the reshaping device (&#x2032;). The furnace () is provided with lateral openings () for temporarily connecting activating lines () to the activating openings () of the reshaping device (&#x2032;) in a sealed manner in order to operate the reshaping tools () by supplying pressurized air to the reshaping device or by producing a low pressure in the reshaping device (&#x2032;).

The glass ceramic panels are non-transparent and have at least one decoration. In order to fulfill the requirements for a glass ceramic panel that provides a cooking surface for a cooking unit in a variety of different pleasing colors, especially a creamy white color shade (BISQUE), in an economical manner, the glass ceramic panel has a predominant crystalline phase of keatite mixed crystals and a full-surface decorative coating that covers at least 80 percent of the upper smooth surface of the glass ceramic substrate. The full-surface decorative coating is provided in a different color from,the glass ceramic panel. Methods for making these glass ceramic panels are described.

Cooking device with a glass-ceramic panel providing a cooking surface in a variety of different colors and method of making same

The cooking unit has a glass-ceramic panel () providing a cooking surface, which is made of transparent colorless glass-ceramic bulk material or a glass panel made of pre-stressed transparent colorless glass material. Radiant heating elements () are provided under the glass or glass-ceramic panel, which heat respective cooking zones. The glass or glass-ceramic panel has a full surface decorative coating () on its upper side, which makes dirt and usage marks less conspicuous, and an IR permeable coating () having a solid or plain color, preferably bisque-like, on its underside. The IR permeable coating having the solid or plain color prevents an observer from viewing the internal components of the cooking unit that are under the cooking panel from above it.

Cooking unit with a glass-ceramic or glass panel made of transparent colorless material and provided with an IR permeable solid colored underside coating

The glass ceramic panels are non-transparent and have at least one decoration. In order to fulfill the requirements for a glass ceramic panel that provides a cooking surface for a cooking unit in a variety of different pleasing colors, especially a creamy white color shade (BISQUE), in an economical manner, the glass ceramic panel has a predominant crystalline phase of keatite mixed crystals and a full-surface decorative coating that covers at least 80 percent of the upper smooth surface of the glass ceramic substrate. The full-surface decorative coating is provided in a different color from the glass ceramic panel. Methods for making these glass ceramic panels are described.

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Mainz, Germany

Dieter Schoenig