摘要:
A method for the production of glass ribbon portions is provided that includes: transporting a glass ribbon at a velocity v1, wherein the velocity v1 is dependent on the predetermined glass thickness (d1), with the application of a tensile stress parallel to the edges of the glass ribbon, in a plane E1, and cooling the glass ribbon at a cooling rate that is dependent on the predetermined glass thickness (d1), inserting a score on the surface of the glass ribbon in at least one edge area by scoring the glass surface with a scoring tool, wherein the score has an angle a to the transport direction of the glass ribbon, deflecting the glass ribbon in a plane E2 to generate a bending stress and separating a glass ribbon portion with the formation of edges by breaking the glass ribbon on the extension of the score running transversely to the glass ribbon.
摘要:
An apparatus is provided for producing thin glass ribbons from molten glass. The apparatus includes a drawing tank, a direct heater, and an indirect heater. The drawing tank has a lower elongated nozzle opening through which the molten glass can exit downwards. The direct heater has one or more heating circuits operable to heat the drawing tank in a first heating zone. The direct heater has a power source for each on the heating circuits. Each heating circuit has connections to connected to a wall of the drawing tank so that current from the power source flows through at least a portion of the wall and heats the wall. Each heating circuit also includes current-carrying portions of the wall. The indirect heater has one or more heating elements to heat the drawing tank in a second heating zone.
摘要:
The present invention relates to glasses, such as e.g. thin or thinnest glasses, but also to glasses for the production of tubular glass, carpules and syringes as well as other pharmaceutical vessels. The glasses are characterized by a high chemical prestressability (tem-perability) with very well alkali, hydrolytic and/or acid resistance as well as an advantageous coefficient of thermal expansion. The glass has a composition characterized by the following constituent phases: 0-60 mol % reedmergnerite; 20-60 mol % albite; 0-30 mol % orthoclase; 0-20 mol % natrosilite; 0-20 mol % sodium metasilicate; 0-20 mol % parakeldyshite; 0-20 mol % narsarsukite; 0-20 mol % disodium zinc silicate; 0-21 mol % cordierite; and 0-20 mol % danburite. A quotient of a coefficient of thermal expansion of the glass multiplied by 1000 (in ppm/K) and the product of a pH value and a removal rate in alkaline environment (in mg/(dm23h)) according to ISO 695 is at least 9.0.
摘要:
A glass film has a first and a second surface which are both defined by like edges, wherein the surface of at least two edges which are located opposite one another have an average surface roughness of an maximum of 2 nanometers.
摘要:
A method for separating a thin glass sheet, such as a glass film along a predefined cutting line provides the cutting line immediately has a temperature of greater than 250 K below the transformation point Tg of the glass of the thin sheet of glass, including the input of energy along the cutting line using a laser beam which acts such that a separation of the thin glass sheet occurs.
摘要:
An apparatus is provided for producing thin glass ribbons from molten glass. The apparatus includes a drawing tank, a direct heater, and an indirect heater. The drawing tank has a lower elongated nozzle opening through which the molten glass can exit downwards. The direct heater has one or more heating circuits operable to heat the drawing tank in a first heating zone. The direct heater has a power source for each on the heating circuits. Each heating circuit has connections to connected to a wall of the drawing tank so that current from the power source flows through at least a portion of the wall and heats the wall. Each heating circuit also includes current-carrying portions of the wall. The indirect heater has one or more heating elements to heat the drawing tank in a second heating zone.
摘要:
An apparatus is provided for drawing glass ribbons from molten glass. The apparatus includes a drawing tank for holding the molten glass and a guiding body. The tank has a lower nozzle opening through which the molten glass can exit downwards. The nozzle opening has two nozzle slots defined between the guiding body and edges of the nozzle opening. The guiding body protrudes downward out of the nozzle opening. The guiding body is supported so as to be spaced apart from the edges with the guiding body suspended in a self-supporting manner at least along a central section of the nozzle opening.
摘要:
A method for producing a glass product is provided. The method includes providing a glass melt; hot forming the glass melt to obtain a glass product; and transferring the glass melt from a first region to a second region through a tube. The tube has a part that protrudes with a length into the glass melt in the first region. The part being at a distance from an inner base lying directly thereunder. The length and the distance are configured so that little defective glass gets into the tube and is transferred to the second region.
摘要:
A glass roll includes at least one glass film and one intermediate material one on top of the other in at least two layers onto a winding core. The glass film layers are held in place by the intermediate material layers. The glass roll is produced with a method including provision of a glass film, a winding core and a compressible intermediate material. At least one inside layer of the intermediate material is wound onto the winding core. The glass film and the intermediate material are wound onto the winding core in such a manner that the glass film is wound onto the winding core in alternating layers with the intermediate material. The intermediate material and/or the glass film is wound at a tensile stress acting in a longitudinal direction which causes a compression of the intermediate material and holds the glass film end in place on the glass roll.
摘要:
A glass article is composed of an aluminosilicate glass with at least one halogen with refining action in an amount ranging from 500 ppm to 8000 ppm and an Sn content of less than 500 ppm. The glass has less than 100 ppm As and less than 100 ppm Sb and the glass article has a thickness of less than 250 μm.