Abstract: A glass ribbon in the form of a glass roll is provided that is optimized with respect to the requirements of a long service life and at the same time compact dimensions. A bending radius on the inner side of the thin glass roll is determined by performing breakage tests on samples of the glass material, statistical parameters are determined on the basis of the breakage tests, and the statistical parameters are converted into a range of bending radii which meet the requirements on service life and the most compact dimensions possible of the thin glass roll.

Abstract: The present disclosure relates to bendable and/or foldable articles and uses thereof and to a method of providing bendable and/or foldable articles. The articles are of translucent and brittle material, such as glass, glass ceramic, ceramic or crystals. The articles may be used as a display cover such as a protecting cover in displays in, for example, smartphones, tablet computers, or TV devices. The articles may also be used as a substrate for electronic components, such as OLEDs or LEDs.

Abstract: A method is provided for scoring glasses. The method includes the steps of generating a deep crack in the glass along an intended separation line by exerting pressure onto the glass surface using a rigid scoring tool, wherein the scoring tool, by being pressed against the glass surface and due to the advancement force while introducing the deep crack generates a zone of elastic strain in the glass in a direction along the glass surface and perpendicular to the separation line, which extends in an arc in the plane defined by the separation line perpendicular to the glass surface such that one leg of the arc is located close to the contact point of the scoring tool on the glass surface and another leg is located inside the glass. The arc being open towards the advancement/advancement direction of the scoring tool.

Abstract: A lightweight composite pane is provided that includes a mineral glass or glass-ceramic pane and an organic layer. The weight per unit area of the lightweight composite pane is in the range from 0.5 kg/m2 to 5.5 kg/m2, the ratio of the thickness of the mineral glass pane to the thickness of the organic layer is 1:0.01 to 1:1, and the thickness of the organic layer is less than or equal to 500 ?m. The lightweight composite pane meets the thermal safety requirements of aerospace authorities and has a “Total Heat Release,” measured in compliance with JAR/FAR/CS 25, App. F, Part IV & AITM 2.0006, of less than 65 kW×min/m2 and a flame time, after removal of the flame in the “Vertical Bunsen Burner Test”, measured in compliance with FAR/JAR/CS 25, App. F, Part 1 & AITM 2.0002A, is less than 15 seconds.

Abstract: An article of transparent and brittle material, such as glass, glass ceramic, ceramic or crystals. The article includes at least one exchange layer and at least one bulk layer. The at least one exchange layer includes at least one kind of cation ions with an increased proportion compared to the at least one bulk layer and at least one kind of cation ionR with a reduced proportion compared to the at least one bulk layer. The article is in particularly used as a display cover for flexible displays or flexible protective foils, for example in smartphones or tablets or TV sets. The article can also be used as a substrate for an electronic component such as an OLED or LED.

Abstract: A method for producing a cavity in a substrate composed of hard brittle material is provided. A laser beam of an ultrashort pulse laser is directed a side surface of the substrate and is concentrated by a focusing optical unit to form an elongated focus in the substrate. Incident energy of the laser beam produces a filament-shaped flaw in a volume of the substrate. The filament-shaped flaw extends into the volume to a predetermined depth and does not pass through the substrate. To produce the filament-shaped flaw, the ultrashort pulse laser radiates in a pulse or a pulse packet having at least two successive laser pulses. After at least two filament-shaped flaws are introduced, the substrate is exposed to an etching medium which removes material of the substrate and widens the at least two filament-shaped flaws to form filaments. At least two filaments are connected to form a cavity.

Abstract: A method for the production of microfluidic cells using a disc-shaped glass element is provided. The disc-shaped glass element has a thickness of at most 700 micrometers is structured in such a way that it has at least one opening. The opening connects the two opposite-lying, parallel side faces of the glass element. The side faces are attached to a glass part so that the opening is sealed by the two glass parts to form a microfluidic cell having a cavity enclosed therein. The cavity is suitable for the conveyance of fluids. The attachment of the glass element to at least one of the two glass parts is produced by an adhesive that is applied onto the side face of the glass element. During application of the adhesive, the at least one opening in the glass element is left free of adhesive.

Abstract: Thin glass elements with improved edge strength are provided—from a sheet glass element that has two opposite parallel faces and an edge connecting the faces. The sheet glass element has a thickness of at most 700 ?m. At least a portion of the edge is defined by an edge surface portion that is convexly curved, so that at least one of the faces merges into the edge surface portion, wherein a curved arc of the edge surface portion has a length that is at least 1/30 of the thickness of the sheet glass element. In the region of the convex curvature, the edge surface portion has indentations in the form of furrows.

Abstract: An improved measurement method and a corresponding measurement device are provided that measure the edge strength of plate-shaped elements made of brittle-fracture material. For this purpose, a long sample is drawn apart at the short edges, wherein the force transmission points lie next to the center of gravity of the base surface of the sample.

Abstract: Thin glass elements with improved edge strength are provided—from a sheet glass element that has two opposite parallel faces and an edge connecting the faces. The sheet glass element has a thickness of at most 700 ?m. At least a portion of the edge is defined by an edge surface portion that is convexly curved, so that at least one of the faces merges into the edge surface portion, wherein a curved arc of the edge surface portion has a length that is at least 1/30 of the thickness of the sheet glass element. In the region of the convex curvature, the edge surface portion has indentations in the form of furrows.

Abstract: The present disclosure relates to bendable and/or foldable articles and uses thereof and to a method of providing bendable and/or foldable articles. The articles are of translucent and brittle material, such as glass, glass ceramic, ceramic or crystals. The articles may be used as a display cover such as a protecting cover in displays in, for example, smartphones, tablet computers, or TV devices. The articles may also be used as a substrate for electronic components, such as OLEDs or LEDs.

Abstract: A method for processing a thin glass is provided. The thin glass is subjected to a tensile stress ?app smaller than 1.15 · Min ? ( ? _ a - ? a ? 0.4 · ( 1 - ln ? ( A ref A App ? ? ) ) , ? ? _ e - ? e ? 0.4 · ( 1 - ln ? ( L ref L App ? ? ) ) ) , wherein ?a is a mean value of tensile stress at break for fractures in a surface of samples of the thin glass under bending stress, wherein ?a is a mean value of tensile stress at break for fractures emanating from an edge of the samples, wherein Lref is an edge length and Aref is a surface area of the samples, wherein ?e and ?a denote standard deviations of the mean values ?e and ?a, respectively, and wherein Aapp is a surface area of the thin glass, Lapp is a summated edge length of opposite edges of the thin glass, and ? is a predefined maximum fracture rate within a period of time of at least half a year.

Abstract: Thin glass elements with improved edge strength are provided—from a sheet glass element that has two opposite parallel faces and an edge connecting the faces. The sheet glass element has a thickness of at most 700 ?m. At least a portion of the edge is defined by an edge surface portion that is convexly curved, so that at least one of the faces merges into the edge surface portion, wherein a curved arc of the edge surface portion has a length that is at least 1/30 of the thickness of the sheet glass element. In the region of the convex curvature, the edge surface portion has indentations in the form of furrows.

Abstract: A method and an apparatus for examining the fracture strength of flat samples made of brittle-fracture material are provided. The margin of the respective sample is subjected to tensile stress by bending the material in a circular arc shape.

Abstract: A glass ribbon in the form of a glass roll is provided that is optimized with respect to the requirements of a long service life and at the same time compact dimensions. A bending radius on the inner side of the thin glass roll is determined by performing breakage tests on samples of the glass material, statistical parameters are determined on the basis of the breakage tests, and the statistical parameters are converted into a range of bending radii which meet the requirements on service life and the most compact dimensions possible of the thin glass roll.

Abstract: An improved measurement method and a corresponding measurement device are provided that measure the edge strength of plate-shaped elements made of brittle-fracture material. For this purpose, a long sample is drawn apart at the short edges, wherein the force transmission points lie next to the center of gravity of the base surface of the sample.

Abstract: An improved measurement method and a corresponding measurement device are provided that measure the edge strength of plate-shaped elements made of brittle-fracture material. For this purpose, a long sample is drawn apart at the short edges, wherein the force transmission points lie next to the center of gravity of the base surface of the sample.

Abstract: A long-term bendable glass material includes a glass material having a bending radius in a range of 1 mm to 107 mm. The glass material is structured such that a number of breaks developing over a course of time after a storage period of at least one day displays a remaining probability of breaking of less than 0.1 for a storage time period of a maximum of half a year.

Abstract: A method for processing a thin glass is provided. The thin glass is subjected to a tensile stress ?app smaller than 1.15 · Min ? ( ? _ a - ? a ? 0.4 · ( 1 - ln ? ( A ref A App ? ? ) ) , ? ? _ e - ? e ? 0.4 · ( 1 - ln ? ( L ref L App ? ? ) ) ) , wherein ?a is a mean value of tensile stress at break for fractures in a surface of samples of the thin glass under bending stress, wherein ?a is a mean value of tensile stress at break for fractures emanating from an edge of the samples, wherein Lref is an edge length and Aref is a surface area of the samples, wherein ?e and ?a denote standard deviations of the mean values ?e and ?a, respectively, and wherein Aapp is a surface area of the thin glass, Lapp is a summated edge length of opposite edges of the thin glass, and ? is a predefined maximum fracture rate within a period of time of at least half a year.

Abstract: A lightweight composite panel is provided that includes at least one mineral glass or glass-ceramic panel and at least one organic layer. The weight per unit area of the lightweight composite panel is in the range from 0.5 kg/m2 to 5.5 kg/m2, the ratio of the total thickness of the one or more mineral glass or glass-ceramic panels to the total thickness of all of the organic layers is from 1:0.01 to 1:1 and the total thickness of all of the organic layers is less than or equal to 350 ?m. The lightweight composite panel complies with the thermal safety requirements of the air travel authorities and its “Total Heat Release,” measured in accordance with JAR/FAR/CS 25, App. F, Part IV & AITM 2.0006, is less than 65 kW×min/m2 and its flame time after removal of the flame in the “Vertical Bunsen Burner Test”, measured in accordance with FAR/JAR/CS 25, App. F, Part 1 & AITM 2.0002A, is less than 15 s.