A method of manufacturing a glass ribbon can comprise flowing a glass-forming ribbon along a travel path. The glass-forming ribbon can comprise a first major surface and a second major surface opposite the first major surface. A thickness can be defined between the first major surface and the second major surface. The method can comprise heating the first major surface of the glass-forming ribbon at a target location of the travel path while the glass-forming ribbon is travelling along the travel path. The heating can increase a temperature of the glass-forming ribbon at the target location to a heating depth of about 250 micrometers or less from the first major surface. The method can comprise cooling the glass-forming ribbon into the glass ribbon. Prior to the heating, the glass-forming ribbon at the target location can comprise an average viscosity in a range from about 1,000 Pascal-seconds to about 10.sup.11 Pascal-seconds.

A method for producing a glass article includes a forming step (P1) of forming a glass ribbon (2) from a molten glass (6) and a transport step (P2) of transporting the glass ribbon (2) along a transport path. In the transport step (P2), a first roller (9a) and a second roller (9b) configured to transport the glass ribbon (2) while in contact with a first end portion (2s) and a second end portion (2t) of the glass ribbon (2) in the width direction, respectively, are disposed, and a speed difference is provided between the first roller (9a) and the second roller (9b).

A method of controlling compaction including obtaining a plurality of sets of process conditions for a plurality of glass ribbons, measuring a compaction value for a glass sheet cut from each glass ribbon of the plurality of glass ribbons, correlating the compaction to the process conditions. The method further includes selecting a predetermined cooling curve including a plurality of cooling rates, modifying the cooling curve by varying cooling rates of the plurality of cooling rates, calculating a predicted compaction value for a glass sheet cut from a glass ribbon drawn using the modified cooling curve, and repeating the modification and predicting until compaction is minimized.

A glass manufacturing apparatus includes a delivery tube terminating at a lower end in a delivery slot. A stream of molten material is delivered along a travel plane in a travel direction. A first plate is positioned adjacent the lower end of the delivery tube on a first side of the travel plane. The first plate includes a first edge extending adjacent the travel plane and a first thermal expansion slot extending from the first edge to a first interior. A second plate is positioned adjacent the lower end of the delivery tube on a second side of the travel plane. The second plate includes a second edge extending adjacent the travel plane and a second thermal expansion slot extending from the second edge to a second interior. The second edge is spaced apart from the first edge to define a delivery opening through which the delivery tube extends.

Methods of manufacturing a ribbon can comprise identifying a location of a nonuniformity in a characteristic of a molten portion of a moving ribbon. The methods can further comprise impinging a deflected pulsed laser beam on a heating zone comprising a location of a nonuniformity in the molten portion of the ribbon. In some embodiments, the heating zone can be elongated in a travel direction of a travel path of the moving ribbon. In some embodiments, the pulsed laser beam can be reflected off a reflective surface of a polygonal reflecting device rotating at a substantially constant angular velocity. In some embodiments, the methods can include impinging the deflected pulsed laser beam on a sensing device to generate a signal. The methods can further comprise calibrating a location of the deflected pulsed laser beam based on the signal from the sensing device.

The present disclosure provides a device and a method with which flat glasses with particularly uniform thickness can be obtained. The methods are drawing methods in which a glass ribbon is drawn. In the method an aperture is used which allows a defined very small slit between the glass ribbon and the aperture also in the case of a change of the position of the glass ribbon.

A glass plate has a dielectric dissipation factor at 10 GHz of tan δA and a glass transition temperature of Tg° C. The glass plate satisfies (tan δ100−tan δA)≥0.0004, where tan δ100 is a dielectric dissipation factor of the glass plate at 10 GHz after having been heated to (Tg+50)° C. and then cooled to (Tg−150)° C. at 100° C./min.

A method for producing a flat thin glass ribbon is provided. The method includes the steps of drawing melted glass downward away from a tank in a pulling direction while applying tensile forces which act in the pulling direction to form the thin glass ribbon having a thickness of at most 250 μm and cooling the thin glass ribbon until a temperature of the thin glass ribbon undershoots a glass transition temperature. The tensile forces are transferred to the thin glass ribbon by at least two pairs of drawing rollers. The at least two pairs of drawing rollers are spaced apart transversely to the pulling direction and contact the thin glass ribbon on longitudinal edges of the thin glass ribbon. The thin glass ribbon only makes contact with the at least two pairs of drawing rollers at a position where the temperature of the thin glass ribbon is at most at or below 500° C.

A method for producing ultra-thin glass sheets is provided that results in glass sheets with high edge strength. The method includes: hot forming a continuous glass ribbon with a glass thickness from molten glass; annealing the glass ribbon with an annealing rate chosen based on the glass thickness; producing a laser beam focus area that is longer than the glass thickness; introducing filamentary defects into the glass ribbon using the laser beam so that the filamentary defects extend from one face to the opposite face and are spaced apart from one another along the breaking lines to produce transverse breaking lines and longitudinal breaking lines with margins each comprising a thickened bead; separating the beads along the longitudinal breaking lines and separating glass sheets by severing along the transverse breaking lines.

A glass roll of band-shaped glass film is free of skew and single slack when a roll-to-roll mode is used. The band-shaped glass film is wound into a roll shape and has creases formed thereon. The band-shaped glass film includes an effective section with two side edges in a width direction extending parallel to each other, and leading and trailing end portions extending parallel to the width direction. When a length from the leading end portion to the trailing end portion along a surface of the effective section is measured along each of a first position along one side edge and a second position along another side edge, a difference between the first and second measurement lengths is 400 ppm or less of a longer measurement length of the first and second measurement lengths.