Abstract: Provided is a continuous casting method of a silicon ingot for continuously casting the silicon ingot by arranging, inside an induction coil, a bottomless cold crucible having a part along an axial direction that is circumferentially divided into a plurality of strip elements, forming molten silicon inside the cold crucible through electromagnetic induction heating by the induction coil, and solidifying the molten silicon while pulling it down from the cold crucible, wherein as the cold crucible, used is a cold crucible with Ni—B alloy plating on a portion in the inner surface thereof that faces the outer side surface of the molten silicon and the outer surface of the silicon ingot. The method can reduce the damage to the inner surface of the cold crucible, in addition to the contamination of cast ingots with impurities.

Abstract: A fused silica body comprising a layer of vitreous silica adjacent at least a portion of an inner surface is described in embodiments herein. In other embodiments, a method of making a fused silica body with a layer of vitreous silica adjacent at least a portion of an inner surface is described herein, comprising heating at least a portion of the inner surface to the point of vitrification. In certain embodiments, the method involves passing a linear local heat source over the inner surface in a particular manner, such as a helical fashion transverse to the linear shape, and may involve creating on the inner surface of the body overlapping swaths of temporarily melted silica material.

Abstract: A porous preform production apparatus having a reaction vessel which includes an upper deposition chamber having an air supply inlet and an exhaust outlet, a lower deposition chamber having an air supply inlet, and a top chamber disposed on top of the upper deposition chamber and adapted to lift and store a porous preform formed by deposition, characterized in that the floor of the upper deposition chamber is disposed at a height between the lower end of a straight body part and the deposition tip of the porous glass preform during deposition, and a connection opening which connects the upper deposition chamber with the lower deposition chamber, is provided on the floor of the upper deposition chamber, and that when the aperture diameter of the connection opening is designated as A and the diameter of the porous preform passing through the connection opening as B, the ratio B/A satisfies the expression 0.05?B/A?0.6.

Abstract: A method of cleaving and separating a glass sheet includes a cleaving step of cleaving a glass sheet along preset cleaving lines by a laser cleaving method, and a separation step of separating adjacent pieces of the cleaved glass sheet from each other. The cleaving step is performed under a state in which the glass sheet is placed on support members provided respectively in segment regions, which are segmented by the preset cleaving lines. The separation step is performed by separating the support members from each other in adjacent segment regions.

Abstract: A glass layer 3 is irradiated with laser light L2 for temporary firing in order to gasify a binder and melt the glass layer 3, thereby fixing the glass layer 3 to a glass member 4. Here, an irradiation region of the laser light L2 has regions A1, A2 arranged along an extending direction of a region to be fused R and is moved along the region to be fused R such that the region A1 precedes the region A2. The region A2 irradiates the glass layer 3 before the glass layer 3 molten by irradiation with the region A1 solidifies. This makes the glass layer 3 take a longer time to solidify, whereby the binder gasified by irradiation with the region A1 of the laser light L2 is more likely to escape from the glass layer 3.

Abstract: Provided is a method of cleaving and separating a glass sheet (G), the method comprising: a cleaving step of cleaving the glass sheet (G) along preset cleaving lines (X, Y) by a laser cleaving method; and a separation step of separating adjacent pieces of the cleaved glass sheet (G) from each other, wherein the cleaving step is performed under a state in which the glass sheet (G) is placed on a sheet (S) having stretchability, and the separation step is performed by stretching the sheet (S).

Abstract: A silica crucible is made in a mold cavity of the type in which ambient atmosphere can be drawn through silica grain in the cavity. In one embodiment, a silica grain layer is formed in the mold cavity and gas, which may comprise helium, nitrogen, hydrogen, or a mixture thereof, is introduced into the mold cavity. The silica grain layer is heated while substantially no ambient atmosphere is drawn through the silica grain. Thereafter, at least a portion of the silica grain layer is fused while drawing ambient atmosphere through the silica grain. The gas displaces air in the mold cavity thereby reducing nitrogen oxides and ozone.

Abstract: Provided is a method for manufacturing an optical fiber preform using a combustion burner. The method includes at least one of: a step ? of, when a mode is changed from a deposition mode to a non-deposition mode, changing a gas discharged from a combustion gas port of the burner from a combustion gas to a purge gas, while maintaining a pilot light and a flow rate of a supporting gas from supporting gas discharge nozzles of the burner so that the nozzle tip does not glow; and a step ? of, when the mode is changed from the non-deposition mode to the deposition mode, changing a gas discharged from the combustion gas port from a purge gas to a combustion gas, while maintaining a pilot light and the flow rate of the supporting gas so that the nozzle tip does not glow.

Abstract: A method for manufacturing a plate inorganic nonmetal material by using a molten slag by introducing the molten slag into a pool for preserving heat and modifying, wherein a temperature of the molten slag is 1450° C.-1600° C., and modifying a viscosity and/or a color of the molten slag according to requirements of the product manufactured. The modified molten slag is introduced into a float process furnace using tin or tin alloy carrier forming a plate of inorganic nonmetal material which is discharged at 1000-1300° C. The plate is maintained at 600° C.-900° C. for 0.5-2 hours in a non-reducing atmosphere, and then cooled to a room temperature within 1-2 hours. An energy-saving and efficient method for comprehensively utilizing the blast furnace slag is provided. The produced plate inorganic nonmetal material has such characteristics as stable color quality, abrasion resistance, pressure resistance, strong adhesiveness, low coefficient of expansion and low shrinkage ratio.

Abstract: A method for sealing the pump-out hole of vacuum glass comprises: first preparing metal layer which is bonded with the glass plate at the outside surface of the glass plate around the pump-out hole; and air-tightly welding the sealing element and the metal layer around the pump-out hole by metal brazing technology after pumping. A structure and a device for sealing the pump-out hole of vacuum glass are also provided. The method can seal the pump-out hole reliably and firmly; the sealing structure is stable and has long service life; the welding between the sealing element and the metal layer can be completed instantly and the properties of the glass materials will not be affected.

Abstract: An apparatus for producing a glass-coated wire, the apparatus comprising at least one heating device adapted to, independently, heat a core material to a melting temperature thereof and heat a glass material to a drawing temperature thereof.

Abstract: An apparatus for making a glass sheet using overflow fusion down-draw process comprising an inlet assembly having an elliptic cylindrical section coupled to a transition section which is, in turn, coupled to an open end of an open channel of an isopipe, and an overflow fusion down-draw process for making glass sheet. The glass melt flow has a high surface velocity profile conducive to the formation of a glass ribbon over the surface of the weirs and the wedge side surfaces with the desired mass distribution.

Abstract: Methods and apparatuses for cooling optical fibers are disclosed. In one embodiment, In some embodiments, a cooling apparatus for cooling an optical fiber in a production process includes a channel defined by at least one sidewall assembly and a plurality of interior cavities positioned along the interior of the sidewall assembly. The interior cavities include at least one plenum, a first plurality of fluid supply cavities in fluid communication with the at least one plenum, and a second plurality of fluid supply cavities in fluid communication with the at least one plenum. Cooling fluid is supplied from the at least one plenum to the first plurality of fluid supply cavities in a first direction and the second plurality of fluid supply cavities in a second direction opposite the first direction.

Abstract: An exemplary bushing system utilizes a bushing having a bottom plate having a plurality of holes from which filaments are drawn, and a plurality of support-receiving elements that are each configured to receive an elongated support. The support-receiving elements extend through the bushing generally along a longitudinal axis. A frame supports the bushing and includes a pair of horizontal rails upon which the supports rest. The horizontal rails comprise a treated surface that permits movement of the elongated supports relative to the frame in the longitudinal direction as the bushing expands and contracts due to thermal heating and cooling.

Abstract: A method for manufacturing an optical fiber preform that includes preparing a glass cylinder with inner and outer surfaces forming at least part of a cladding portion are repeatedly polished, and a glass core rod that includes a core portion having a higher refractive index than the cladding portion; and inserting the core rod into the glass cylinder and heating the glass cylinder and core rod to form a single body. The repeated polishing of the inner surface of the glass cylinder includes passing pure water that does not contain a cutting fluid over the inner surface for at least the final polishing. The polishing is preferably performed using a polishing cloth to which are affixed diamond abrasive grains. The glass core rod and the glass cylinder are preferably formed of composite quartz glass.

Abstract: Methods of forming an overclad portion of an optical fiber are described which include positioning a core cane member in an overclad tube to form a rod and tube assembly. Thereafter, glass soot pellets are positioned in the rod and tube assembly between the core cane member and an interior sidewall of the overclad tube. The rod and tube assembly is then redrawn under conditions effective to form the overclad tube and the glass soot pellets into a continuous, void-free glass layer surrounding the core cane member at a sintering time tsinter of at least 1800 seconds thereby forming an overclad portion of an optical fiber.

Abstract: Provided is a method for manufacturing glass preforms with high yield. In the glass-preform manufacturing method according to the present invention, a glass preform is produced through a fixing step, a deposition step, an extraction step, a vitrification step, and a collapsing step in the enumerated order. At the deposition step, the mean density of the glass soot body deposited on the circumference of the tubular handle 12 is made higher than the mean density of the glass soot body deposited on the circumference of the starting mandrel 11. It is preferable that the longitudinal variation in the mean density of a glass soot body deposited from the start of deposition to the tenth layer of glass particles within the range of ±50 mm from the boundary position between the starting mandrel and the tubular handle be 0.01 g/cc/mm or less.

Abstract: There is provided a method for manufacturing a porous glass base material by using a porous glass base material manufacturing burner having an oxidizing gas discharge port. The method includes supplying a gas mixture obtained by blending together an oxidizing gas and an inert gas to the oxidizing gas discharge port at a start of deposition of a glass fine particle, and increasing a flow rate of the oxidizing gas supplied to the oxidizing gas discharge port while decreasing a flow rate of the inert gas supplied to the oxidizing gas discharge port.

Abstract: An optical fiber end processing method includes the steps of: an optical fiber fixing step of fixing two parts of the optical fiber; a first heating step of heating a tip end side part of the optical fiber between two fixed parts fixed in the optical fiber fixing step, and melting the optical fiber of the tip end side heating part; a second heating step of heating a part on a base end side of the optical fiber between the fixed parts away from the tip end side heating part in a state that two parts of the optical fiber are fixed, and making the holes of the optical fiber disappear; and a removing step of removing the tip end side heating part after the second heating step.

Abstract: The present invention provides an apparatus and a method for fabricating a glass rod from a glass preform capable of suppressing a diameter fluctuation of the drawn glass rod even when there is a relatively large diameter reduction ratio between the glass preform and the glass rod, such as 60 to 95%. The feed speed V1 of the glass preform is set to a constant value, the diameter D of the glass preform is acquired for determining the drawing speed V2 from diameter data of the glass preform measured before being drawn at a diameter acquisition position defined with respect to a reference position of the furnace. The distance from the reference position to the diameter acquisition position is defined so as to vary depending on a diameter fluctuation of the glass preform before being drawn in a longitudinal direction thereof.