Provided are an apparatus and a method for making a strengthened glass sheet including a glass layer with a first coefficient of thermal expansion and a first non-glass surface film formed on the glass layer, wherein the first non-glass surface film has a second coefficient of thermal expansion that is less than the first coefficient of thermal expansion and a compressive stress of at least 700 MPa.

Provided are an apparatus and a method for making a strengthened glass sheet including a glass layer with a first coefficient of thermal expansion and a first non-glass surface film formed on the glass layer, wherein the first non-glass surface film has a second coefficient of thermal expansion that is less than the first coefficient of thermal expansion and a compressive stress of at least 700 MPa.

An apparatus and process for making glass and glass gobs on demand. A sheet of molten glass is provided in a staging section. The sheet of molten glass is held within the staging section when there is no demand for glass articles. When there is a demand for production of glass articles, a portion of the sheet of molten glass is flowed into a gob forming section.

A glass article includes a glass composition including mole percent (mol %) to 70 mol % of SiO.sub.2, 5 mol % to 15 mol % of Al.sub.2O.sub.3, 5 mol % to 15 mol % of Na.sub.2O, greater than 0 mol % and equal to or less than 5 mol % of K.sub.2O, 5 mol % to 15 mol % of Li.sub.2O, and greater than 0 mol % and equal to or less than 5 mol % of MgO, and satisfying Relation (1) below:

0.1Al.sub.2O.sub.3/(sum of Na.sub.2O,K.sub.2O, and Li.sub.2O)0.7(1),

where Al.sub.2O.sub.3, Na.sub.2O, K.sub.2O, and Li.sub.2O in the Relation (1) denote contents (mol %) of Al.sub.2O.sub.3, Na.sub.2O, K.sub.2O, and Li.sub.2O, respectively, in the glass composition, and the glass article has a thickness of 100 micrometers (m) or less.

A glass article includes a glass composition including mole percent (mol %) to 70 mol % of SiO.sub.2, 5 mol % to 15 mol % of Al.sub.2O.sub.3, 5 mol % to 15 mol % of Na.sub.2O, greater than 0 mol % and equal to or less than 5 mol % of K.sub.2O, 5 mol % to 15 mol % of Li.sub.2O, and greater than 0 mol % and equal to or less than 5 mol % of MgO, and satisfying Relation (1) below:

0.1Al.sub.2O.sub.3/(sum of Na.sub.2O,K.sub.2O, and Li.sub.2O)0.7(1),

where Al.sub.2O.sub.3, Na.sub.2O, K.sub.2O, and Li.sub.2O in the Relation (1) denote contents (mol %) of Al.sub.2O.sub.3, Na.sub.2O, K.sub.2O, and Li.sub.2O, respectively, in the glass composition, and the glass article has a thickness of 100 micrometers (m) or less.

A method includes scoring a glass sheet to form a scored region of the glass sheet. The scored region extends in a longitudinal direction and comprises a plurality of deep score portions and a shoulder portion disposed longitudinally between adjacent deep score portions. The glass sheet is severed along a severing line extending in a transverse direction substantially perpendicular to the longitudinal direction and through the shoulder portion of the scored region.

A method includes scoring a glass sheet to form a scored region of the glass sheet. The scored region extends in a longitudinal direction and comprises a plurality of deep score portions and a shoulder portion disposed longitudinally between adjacent deep score portions. The glass sheet is severed along a severing line extending in a transverse direction substantially perpendicular to the longitudinal direction and through the shoulder portion of the scored region.

A fusion draw apparatus includes a pair of engagement rollers. At least one of the pair of engagement rollers includes a circumferential knife edge configured to cooperate with the other of the pair of engagement rollers to thin the edge portion or sever the edge portion from a central portion of the glass ribbon within the viscous zone of the glass ribbon. In further examples, fusion draw methods include the step of thinning the edge portion or severing the edge portion from the central portion of the glass ribbon within the viscous zone.

A fusion draw apparatus includes a pair of engagement rollers. At least one of the pair of engagement rollers includes a circumferential knife edge configured to cooperate with the other of the pair of engagement rollers to thin the edge portion or sever the edge portion from a central portion of the glass ribbon within the viscous zone of the glass ribbon. In further examples, fusion draw methods include the step of thinning the edge portion or severing the edge portion from the central portion of the glass ribbon within the viscous zone.

An improved method and an improved apparatus are provided for producing a thin glass ribbon, which provide borders at the edges of the ribbon. The edges formed are of high mechanical quality and a formation of new secondary borders after the severing or at least the thickness of such secondary borders is reduced compared to the original borders. The method includes drawing the thin glass ribbon from a molten glass or from a preform, severing the borders, and cooling the resulting glass ribbon. The severing is effected at a location along the moving direction of the thin glass ribbon and at a time at which during the cooling of the thin glass ribbon the viscosity of the glass is in a range from 10.sup.7 dPa.Math.s to 10.sup.11 dPa.Math.s, so that the edges of the thin glass ribbon newly produced by the severing of the borders are rounded off.