Abstract: An apparatus and method for chemical deposition on a rod member having a support structure for supporting the rod member substantially coaxial to a deposition axis; a burner for depositing chemical substances on the rod member; and a rotation device for imparting a rotation motion to the rod member. The rotation device has a joint member of a type suitable to transmit torque between two misaligned members, for example, a double universal joint or a flexible joint, positioned between a motor and a rod gripping member.

Abstract: An automatic restart procedure for a system for manufacturing chopped strands. At least one strand coming from a bushing is grabbed by a gripping device. The gripping device is moved right to a drawing device, the drawing device configured to bring the strand to a drawing speed compatible with a chopping operation carried out as the strand passes between an anvil wheel and a chopper wheel of a chopping machine. The path of the strand between the bushing and the drawing device is modified using a transfer device, the transfer device configured to pass the strand between the anvil wheel and the chopper wheel using an engagement device, or to be moved away from the chopper wheel and the anvil wheel.

Abstract: A method and apparatus for collecting and forming loose fill fiber material from an ail stream includes introducing a combined fiber and air stream onto a surface of a rotatable drum. The rotatable drum allows the air to flow through the surface of the drum while collecting the fiber material on the surface of the drum. The collected fiber material is then removed from the drum surface by a blow off header that is internal to the drum.

Abstract: Apparatus for applying traction to an elongate cylindrical element produced by fusion of an end portion of a preform of glass material, in which a traction device is capable of being connected to a portion of the elongate cylindrical element to provide traction of the elongate cylindrical element along an axis. A device for the rotation of the elongate cylindrical element applies a twist to the elongate cylindrical element about the axis simultaneously with the traction.

Abstract: A method for recycling glass mat waste, wound rovings, and other products includes providing a source of glass mat, or a plurality of rovings, for example on a roll, and routing the glass mat or rovings into a submerged combustion melter. An unwind system and a pair of powered nip rolls, powered conveyors, or other arrangement may work in combination to provide a substantially consistent rate of material into the melter. The melter may operate under less than atmospheric pressure to avoid fumes escaping the melter. A slot in the melter allows ingress of the glass mat or rovings into the melter, and a glass mat former such as a folder may be used to ensure that the mat fits through the slot. Alternatively, the glass mat may be cut by a slitter prior to entering the slot.

Abstract: A deposition system for depositing a chemical vapor onto a workpiece is disclosed, including a deposition chamber having a plurality of components for performing chemical vapor deposition on the workpiece. The deposition chamber includes an inner skin made of Hasteloy for sealing the plurality of components and the workpiece from the air surrounding the deposition system, and an outer skin that encloses the inner skin and is separated from the inner skin by an air gap. The outer skin includes vents that create a convection current in the air gap between the inner skin and outer skin of the deposition chamber. The deposition system also has a gas panel for regulating the flow of gases and vapors into the deposition chamber, and a computer for controlling operation of the gas panel and the components in the deposition chamber.

Abstract: The invention relates to a method for welding one end of a primary preform and one end of a silica bar having different properties. The method includes the steps of projecting and fusing silica grain under a plasma torch onto an end of the primary preform and an end of the silica bar, and bringing into contact these respective ends to form an excellent weld between the primary preform and the silica bar. The invention provides a cost-effective way to secure a primary preform to a glass-working lathe support while reducing the risk of costly preform breakage.

Abstract: The device for manufacturing glass, in which bubble formation on precious metal components is prevented, has a precious or refractory metal wall (12, 43) at least partially surrounding a glass melt from which the glass is made, a first electrode pair (20, 21) for measuring oxygen partial pressure at an interface between the glass melt and the wall to obtain an actual value, a second electrode pair (12, 43, 20) for measuring an oxygen partial pressure in the glass melt to obtain a set point value and a regulating system (39, 45) for adjusting the oxygen partial pressure at the interface according to a comparison between the actual value and the set point value, so that the oxygen partial pressure at the interface is within a safe range.

Abstract: A burner for a vapour deposition process has a central nozzle for ejecting a glass precursor material, at least a crown of nozzles surrounding said central nozzle for ejecting a flame reactant, and a circular nozzle between said central nozzle and said crown of nozzles for ejecting an innershield gas, wherein the central nozzle has a concave shape in a cross section in the axial plane and, preferably, a symmetry about an axial plane.

Abstract: An optical connector assembling method capable of preventing workability from worsening is provided. First, when assembling the optical connector, an optical cord (2) is passed through a rear housing (8), an outer jacket holding member (9), a securing member (10), and a boot (11), and an outer jacket (4) is removed from a leading end portion of the optical cord (2), so as to expose a coated optical fiber (3) and a tension-resistant fiber (5). A handled dust cap (16A) is mounted to a ferrule member (6) holding a built-in fiber. Then, a fusion splicer fusion-splices the built-in fiber and the coated optical fiber (3) to each other. Thereafter, while the ferrule member (6) keeps the handled dust cap (16A) mounted thereto, a plug housing (7) is assembled to the rear housing (8). Then, the outer jacket holding member (9) and securing member (10) secure the outer jacket (4) and tension-resistant fiber (5) to the rear housing (8), and the boot (11) is mounted to the securing member (10).

Abstract: Methods for making fiber waveguides include rolling a multilayer structure into a spiral structure and forming the fiber waveguide from the spiral structure. The forming includes drawing a fiber preform derived from the spiral structure.

Abstract: A method for producing an optical fiber preform. Glass soot particles are formed by jetting and combusting a gaseous glass-forming material and a fuel gas from a burner in the presence of oxygen. The glass soot particles are deposited on a deposition rod while rotating the deposition rod about its axis and reciprocating the burner in parallel to the deposition rod so as to form the preform and varying at least one of the translation velocity of the burner and the rotation velocity of the rod so as to obtain a predetermined radial soot density distribution in the preform.

Abstract: An optical device has a substrate, an optical element mounted on the substrate, a first glass member sealing the optical element and the substrate, and a second glass member formed on the first glass member and having a mold separation property higher than the first glass member.

Abstract: A process for the production of a titanium silicalite shaped article by: a) preparation of a synthesis gel containing a Si2 source, a Ti2 source, a template compound and water, b) crystallization of the synthesis gel under hydrothermal conditions, c) drying of the titanium silicalite from step b) at a temperature below the decomposition temperature of the template compound, d) preparation of a formable mass containing the product from step c), a binder and a paste-forming agent, e) forming of the mass from step d) into a green shaped article, f) optionally drying, and g) calcinations of the green shaped article, as well as a titanium silicalite shaped article obtainable according to this process, and the use of this shaped article as a catalyst in epoxidation or ammoximation reactions.

Abstract: A method of manufacturing microchannel plate according to an embodiment of the present invention includes: a first step of fabricating a multifiber having a polygonal cross-section by bundling a plurality of fibers; a second step of fabricating a microchannel plate base material by use of a plurality of the multifibers; and a third step of fabricating a microchannel plate out of the microchannel plate base material. The plurality of fibers include: a first fiber whose predetermined-thickness outer circumferential part surrounding a center part including a core is formed of a predetermined-component glass material; and a second fiber whose both center part including a core and outer circumferential part surrounding the same are formed of the predetermined-component glass material. The second fiber is arranged at, at least, one corner of a polygonal cross-section of the multifiber.

Abstract: A method for manufacturing an optical fiber base material includes producing glass fine particles through a hydrolysis of a glass material gas in a flame created by an oxidizing gas and a combustible gas.

Abstract: A method of producing an optical fiber preform by heating a glass preform that has a glass rod and a silica glass porous body and includes a valid portion and invalid portions, comprising: heating the glass preform while moving the glass preform along its axial direction relative to a heater; stopping the relative movement or decreasing a speed of the relative movement when an invalid portion positioned at a tail end reaches a vicinity of the heater; heating the invalid portion for a predetermined time while maintaining a temperature at which the silica glass porous body can be vitrified; decreasing the heating temperature to a temperature determined by adding 200° C. to an annealing point of a silica glass; and removing the glass preform to the outside of the heating furnace without increasing the heating temperature to the temperature at which the silica glass porous body is vitrified.

Abstract: A method for manufacturing an optical fiber preform is described that includes detecting structural integrity of the tube during a collapsing phase utilizing a fluid flow that is fed to the tube. Also, a system for manufacturing optical fiber preforms is described that comprises a holder configured to hold a tube, a heater configured to heat at least part of the tube to a tube collapsing temperature, and a fluid supply system configured to supply a fluid to the tube held by the holder. The system comprises a tube integrity monitor configured to monitor structural integrity of the tube, during a collapsing phase, by monitoring the fluid.

Abstract: In an apparatus for fabricating an optical fiber, the apparatus includes a drawing furnace provided with an insertion opening for receiving an optical fiber perform, a feed mechanism configured to support one end of the optical fiber preform so as to feed into the drawing furnace, a first sealing unit configured to seal a clearance gap between the optical fiber preform and the insertion opening, and a second sealing unit configured to seal a gap between the optical fiber preform and the first sealing unit when a tapered portion formed at the one end side of the optical fiber preform passes through the insertion opening. As a result, the available entirety of the optical fiber preform can be changed to an optical fiber, so that the cost for fabricating the optical fiber can be significantly reduced.

Abstract: A method for forming buried ion-exchanged waveguides involves a two-step process. In a first step a waveguide is formed at the surface of a substrate using an ion-exchange technique. After formation of the waveguide, a field-assisted annealing is carried out to move the waveguide away from the surface of the substrate so that it is buried in the substrate. Exemplary field-assisted annealing is carried out at a temperature close to the ion-exchange temperature ±10° C. to optimize results.