Abstract: A device for conveying a sheet of substrate having two opposed main faces linked b y an edge face, wherein one of the main faces of the sheet of substrate is positioned along a reception plane of the device, the reception plane being close to a vertical plane, including a plurality of lower rollers positioned side by side along a conveying direction, each of them being able to rotate about a lower rotation axis extending perpendicularly to the conveying direction in a conveying plane and being arranged to receive a part of the edge face of the sheet of substrate, a plurality of upper rollers, each of them being arranged to receive one of said main faces of the sheet of substrate and being able to rotate about an upper rotation axis orthogonal to the conveying direction.

Abstract: A process for the heat treatment of a coating deposited on at least one portion of a first face of a substrate including a first face and a second face opposite the first face, wherein the coating is treated by a laser radiation focused on the coating in the form of a laser line extending along a first direction, the heat treatment being such that, in a second direction transverse to the first direction, a relative displacement movement is created between the substrate and the laser line, wherein the second face is heated locally at a temperature of at least 30° C. in an additional heating zone extending facing the laser line over a length of at least 10 cm along the second direction, with the aid of at least one additional heater positioned on the side opposite the laser line with respect to the substrate.

Abstract: The invention relates to an object containing at least one glass spacer between a first element of said object and a second element of said object, said spacer having a concentration gradient in alkali metal ions from its surface and perpendicular to its surface. The object may be a solar collector under vacuum. The invention also relates to a glass bead having a concentration gradient in alkali metal ions from its surface and perpendicular to its surface and its use as a spacer withstanding a pressure force between two elements, said pressure pushing the two elements together.

Abstract: This flat mineral glass comprises a first free surface and a second free surface, and comprises groups of zones having a high refractive index (n2) and zones having a low refractive index (n1) which are formed in the thickness of the flat glass between the first and second free surfaces, over a depth of between 1 and 1000 ?m starting from the first free surface. These high-index zones and low-index zones alternate along a direction transverse to the thickness direction of the glass between the first and second free surfaces, the high-index zones flaring out from the first free surface toward the second free surface, and the envelope surfaces of the high-index zones making an angle (?) of at least 65° with respect to the first free surface.

Abstract: The process according to the invention is based on the simultaneous ion exchange of two ions having an almost identical mobility with the ions of a glass substrate, at least one of the aforementioned two ions being used in the form of an enamel.