A method for producing a glass sleeve having a first flattened portion and shaping tools for forming such glass sleeves. A method can comprise providing a substantially cylindrical glass tube—optionally polished or otherwise treated to reduce or remove interior imperfections—heating the glass tube to a temperature within the softening range of the glass, introducing one or more shaping tools having a generally D-shaped or generally rectangular cross-section into the enclosed space, and moving the one or more shaping tools against the inner curved surface to deform the tube, forming the first flattened portion. The one or more shaping tools can be made of any suitable material, for example: steel coated with boron nitride; porous graphite or carbon air bearings; or a nickel-based alloy (e.g., Inconel).

Provided is a method of manufacturing an optical fiber base material by an inside mounting method, including: a step of rotating and heating a glass tube fixed at two positions and supplying a gas into a through-hole of the glass tube, wherein in the step, the glass tube is warped so that an axis between respective fixed portions of the glass tube has a shape in which a catenary curve is reversed in the vertical direction.

A sintered porous cordierite-based glass-ceramic material is made using mainly three natural starting materials which are silica sand, kaolin clay and magnesite in addition to little boric acid is described. Upon melting at 1400-1450 C., this combination of raw materials and boric acid forms transparent brown glass which after solidification by quenching is then crushed and reduced to powder having a median particle size diameter less than 65 microns. This brown glass powder is consolidated, for example by compaction, to form a green body for sintering. Sintering of the green body at temperatures between about 1000 C. and 1300 C. in the period from 1 min to 60 min to produce porous cordierite glass-ceramic material containing a 56% porosity. The said material have density, microhardness and CTE suitable for use in various technical fields such as light insulation refractor material and in filter for vehicle exhaust.

A method for manufacturing a transparent open container, the method including providing a continuous metallic-based sheet, having a first surface and a second surface; the continuous metallic-based sheet, having folding lines forming a central zone and at least two lateral zones. The method further including depositing on the first surface of the continuous metallic-based sheet, a transparent dielectric panel being fixed by an interlayer; forming a flat assembly, extending along a plane, P, defined by a longitudinal axis, X, and a vertical axis, Z; having a width, W, measured along the longitudinal axis, X, and a height, H, measured along the vertical axis, Z. The method still further including bending on the folding lines the flat assembly to form the open container to form a transparent open container, defined by X, Z and a Y-axis, and having a depth, D, measured along the Y-axis.

A method for manufacturing a transparent open container, the method including providing a continuous metallic-based sheet, having a first surface and a second surface; the continuous metallic-based sheet, having folding lines forming a central zone and at least two lateral zones. The method further including depositing on the first surface of the continuous metallic-based sheet, a transparent dielectric panel being fixed by an interlayer; forming a flat assembly, extending along a plane, P, defined by a longitudinal axis, X, and a vertical axis, Z; having a width, W, measured along the longitudinal axis, X, and a height, H, measured along the vertical axis, Z. The method still further including bending on the folding lines the flat assembly to form the open container to form a transparent open container, defined by X, Z and a Y-axis, and having a depth, D, measured along the Y-axis.

An object of the present invention is to improve productivity by omitting the strain removal process in the manufacturing process of quartz glass rods and to provide a method of leaving strain that does not cause substantial damage in the event that cracks occur in quartz glass rods after shipment due to the effects of residual strain. A manufacturing method of a quartz glass rod according to the present invention involves obtaining a quartz glass rod of a predetermined diameter by gradually drawing the quartz glass rod through multiple drawing processes. In the manufacturing method of the quartz glass rod, during the multiple drawing processes, the bending of one or more portions of the quartz glass rod drawn by a glass processing lathe is corrected by heating the portions with a burner flame to soften them and bring the bending amount within a specified range.

An object of the present invention is to improve productivity by omitting the strain removal process in the manufacturing process of quartz glass rods and to provide a method of leaving strain that does not cause substantial damage in the event that cracks occur in quartz glass rods after shipment due to the effects of residual strain. A manufacturing method of a quartz glass rod according to the present invention involves obtaining a quartz glass rod of a predetermined diameter by gradually drawing the quartz glass rod through multiple drawing processes. In the manufacturing method of the quartz glass rod, during the multiple drawing processes, the bending of one or more portions of the quartz glass rod drawn by a glass processing lathe is corrected by heating the portions with a burner flame to soften them and bring the bending amount within a specified range.