Provided is a method comprises: continuously forming an elongated, glass film having marginal portions from molten glass into a given shape having two marginal portions, in width-directional opposite edge regions thereof, wherein the glass film having marginal portions has the marginal portions, and an effective portion formed in a width-directional central region of the glass film having marginal portions; annealing the glass film having marginal portions; continuously forming resin tapes on the glass film having marginal portions at positions adjacent to and away by a given distance from the respective marginal portions, to extend in a length direction of the glass film having marginal portions; and continuously removing each of the marginal portions from the glass film having marginal portions, along a position between the marginal portion and a corresponding one of the resin tapes, or at a given width-directional position within the corresponding resin tape.

Provided is a method comprises: continuously forming an elongated, glass film having marginal portions from molten glass into a given shape having two marginal portions, in width-directional opposite edge regions thereof, wherein the glass film having marginal portions has the marginal portions, and an effective portion formed in a width-directional central region of the glass film having marginal portions; annealing the glass film having marginal portions; continuously forming resin tapes on the glass film having marginal portions at positions adjacent to and away by a given distance from the respective marginal portions, to extend in a length direction of the glass film having marginal portions; and continuously removing each of the marginal portions from the glass film having marginal portions, along a position between the marginal portion and a corresponding one of the resin tapes, or at a given width-directional position within the corresponding resin tape.

Provided is a method comprises: continuously forming an elongated, glass film having marginal portions from molten glass into a given shape having two marginal portions, in width-directional opposite edge regions thereof, wherein the glass film having marginal portions has the marginal portions, and an effective portion formed in a width-directional central region of the glass film having marginal portions; annealing the glass film having marginal portions; continuously forming resin tapes on the glass film having marginal portions at positions adjacent to and away by a given distance from the respective marginal portions, to extend in a length direction of the glass film having marginal portions; and continuously removing each of the marginal portions from the glass film having marginal portions, along a position between the marginal portion and a corresponding one of the resin tapes, or at a given width-directional position within the corresponding resin tape.

The present disclosure provides the installation of an apparatus for cooling a manufactured glass rod. The apparatus has at least two cooling chambers arranged along the glass strand for sectional cooling of the glass strand. A gaseous cooling medium is either blown into the cooling chamber or sucked out of the cooling chambers. The glass strand is passed through each cooling chamber, with an orifice provided at each of the pass-through points, whose opening is larger than the cross-section or diameter of the glass strand. As a result, an annular gap forms between the opening and the surface of the glass strand, so that a turbulent flow of the gaseous cooling medium is generated, which enables a high cooling rate.

Provided are: a glass substrate that achieves a high strain point while having a low devitrification temperature; and a method for producing said glass substrate. This glass substrate for a display is made of a glass comprising SiO.sub.2 and Al.sub.2O.sub.3, comprising 0% or more to less than 3% B.sub.2O.sub.3 and from 5 to 14% BaO in mass %, and substantially devoiding Sb.sub.2O.sub.3, wherein the devitrification temperature is 1235 C. or lower and the strain point is 720 C. or higher. Alternatively, this glass substrate for a display is made of a glass comprising SiO.sub.2 and Al.sub.2O.sub.3, comprising 0% or more to less than 3% B.sub.2O.sub.3, 1.8% or more MgO, and from 5 to 14% BaO in mass %, and substantially devoiding Sb.sub.2O.sub.3, wherein (SiO.sub.2+MgO+CaO)(Al.sub.2O.sub.3+SrO+BaO) is less than 42%, the devitrification temperature is 1260 C. or lower, and the strain point is 720 C. or higher. This method for producing said glass substrate for a display comprises: a melting step for melting, by using at least direct electrical heating, a glass material prepared to have a predetermined composition; a forming step for forming, into a flat glass sheet, the molten glass that has been melted in the melting step; and an annealing step for annealing the flat glass sheet, wherein a condition for cooling the flat glass sheet is controlled so as to reduce the heat shrinkage rate of the flat glass sheet.

Provided are: a glass substrate that achieves a high strain point while having a low devitrification temperature; and a method for producing said glass substrate. This glass substrate for a display is made of a glass comprising SiO.sub.2 and Al.sub.2O.sub.3, comprising 0% or more to less than 3% B.sub.2O.sub.3 and from 5 to 14% BaO in mass %, and substantially devoiding Sb.sub.2O.sub.3, wherein the devitrification temperature is 1235 C. or lower and the strain point is 720 C. or higher. Alternatively, this glass substrate for a display is made of a glass comprising SiO.sub.2 and Al.sub.2O.sub.3, comprising 0% or more to less than 3% B.sub.2O.sub.3, 1.8% or more MgO, and from 5 to 14% BaO in mass %, and substantially devoiding Sb.sub.2O.sub.3, wherein (SiO.sub.2+MgO+CaO)(Al.sub.2O.sub.3+SrO+BaO) is less than 42%, the devitrification temperature is 1260 C. or lower, and the strain point is 720 C. or higher. This method for producing said glass substrate for a display comprises: a melting step for melting, by using at least direct electrical heating, a glass material prepared to have a predetermined composition; a forming step for forming, into a flat glass sheet, the molten glass that has been melted in the melting step; and an annealing step for annealing the flat glass sheet, wherein a condition for cooling the flat glass sheet is controlled so as to reduce the heat shrinkage rate of the flat glass sheet.

A glass substrate that achieves a high strain point while having a low devitrification temperature; and a method for producing the glass substrate. This glass substrate for a display is made of a glass comprising SiO.sub.2 and Al.sub.2O.sub.3, comprising 0% or more to less than 4% B.sub.2O.sub.3 in mass %, and substantially devoiding Sb.sub.2O.sub.3, wherein 3BaO/(MgO+CaO+SrO) is 5 or less, MgO/(CaO+SrO) is 0.36 or greater, the devitrification temperature is 1235 C. or lower, and the strain point is 700 C. or higher. The method comprises: melting, by using at least direct electrical heating, a glass material prepared to have a predetermined composition; forming, into a flat glass sheet, the molten glass that has been melted in the melting step; and annealing the flat glass sheet, wherein a condition for cooling the flat glass sheet is controlled so as to reduce the heat shrinkage rate of the flat glass sheet.

A glass substrate that achieves a high strain point while having a low devitrification temperature; and a method for producing the glass substrate. This glass substrate for a display is made of a glass comprising SiO.sub.2 and Al.sub.2O.sub.3, comprising 0% or more to less than 4% B.sub.2O.sub.3 in mass %, and substantially devoiding Sb.sub.2O.sub.3, wherein 3BaO/(MgO+CaO+SrO) is 5 or less, MgO/(CaO+SrO) is 0.36 or greater, the devitrification temperature is 1235 C. or lower, and the strain point is 700 C. or higher. The method comprises: melting, by using at least direct electrical heating, a glass material prepared to have a predetermined composition; forming, into a flat glass sheet, the molten glass that has been melted in the melting step; and annealing the flat glass sheet, wherein a condition for cooling the flat glass sheet is controlled so as to reduce the heat shrinkage rate of the flat glass sheet.

An alkali-free glass, includes, as represented by mol % based on oxides: 50% to 76% of SiO.sub.2; 2% to 6% of Al.sub.2O.sub.3; 18% to 35% of B.sub.2O.sub.3; 1% to 3.5% of MgO; 0.5% to 4% of CaO; 1% to 4.5% of SrO; and 0% to 3% of BaO, in which an expression (A) is [MgO]+[CaO]+[SrO]+[BaO], and a value of the expression (A) is 3.5 to 6, an expression (B) is [Al.sub.2O.sub.3]([MgO]+[CaO]+[SrO]+[BaO]), and a value of the expression (B) is 2 to 2, an expression (J) is ([MgO]+[CaO])/([MgO]+[CaO]+[SrO]+[BaO]), and a value of the expression (J) is 0.2 to 0.7, and -OH is 0 mm.sup.1 to 0.1 mm.sup.1.

An alkali-free glass, includes, as represented by mol % based on oxides: 50% to 76% of SiO.sub.2; 2% to 6% of Al.sub.2O.sub.3; 18% to 35% of B.sub.2O.sub.3; 1% to 3.5% of MgO; 0.5% to 4% of CaO; 1% to 4.5% of SrO; and 0% to 3% of BaO, in which an expression (A) is [MgO]+[CaO]+[SrO]+[BaO], and a value of the expression (A) is 3.5 to 6, an expression (B) is [Al.sub.2O.sub.3]([MgO]+[CaO]+[SrO]+[BaO]), and a value of the expression (B) is 2 to 2, an expression (J) is ([MgO]+[CaO])/([MgO]+[CaO]+[SrO]+[BaO]), and a value of the expression (J) is 0.2 to 0.7, and -OH is 0 mm.sup.1 to 0.1 mm.sup.1.