Abstract: The present invention relates to a chamber environment controlling apparatus for a three-dimensional bioprinter including a printing chamber having an internal space in which printing is performed and which is defined by wall surfaces including sidewalls. The apparatus may include a temperature adjustor including a heater configured to heat the internal space of the printing chamber and an air circulator including an air guide portion extending from an outside of the printing chamber along a sidewall on one side and formed so that air flowing in through an inlet moves along an inside, is heated by the temperature adjustor, and is discharged into the internal space of the printing chamber through an outlet, a circulation fan configured to circulate air along the air guide portion, and a filter configured to filter the air circulating along the air guide portion.

Abstract: A chamber (101, 201), for holding molten glass (113, 202) having a free surface (114, 203), includes a bellows (4, 204), a sealing ring (10, 210), and a cover (30, 50, 230). The bellows is coupled to the chamber, and the sealing ring is coupled to the bellows. The sealing ring may include one or more various devices, associated with operation of the chamber, including: an atmosphere supply tube (14, 214), an electric lead (12), a pressure differential sensor (16, 216), a thermo couple, an oxygen sensor, and/or an auxiliary port (18). The sealing ring further includes an upper opening (21) having an inner diameter (22). The cover is removably coupled to the sealing ring and extends over the sealing-ring-upper-opening inner diameter, wherein the sealing ring is disposed between the cover and the chamber. The cover may include various separately removable sections (30, 32, 34, 35, 37, 50, 52, 54).

Abstract: A bubbler for injecting gas bubbles into a glass bath in a melter includes an injector mounted to a bottom portion of the melter beneath the glass bath, the injector having a surface exposed to the glass bath; a plurality of passageways formed in the injector extending through the injector and opening at the surface for providing the gas bubbles into the glass bath; and a controller connected to the bubbler for controlling origination and release of the gas bubbles for injection into the glass bath.

Abstract: An apparatus for homogenizing molten glass is disclosed comprising a stir chamber including a rotatable stirrer disposed therein. The apparatus further comprises a catcher coupled to the stirrer shaft, the catcher having a concave, bowl-like shape and adapted to prevent particulate from falling from upper surfaces of the stir chamber into the molten glass. At least a portion of the catcher bottom is in contact with the upper surface of the molten glass, whereas a peripheral edge of the catcher is preferably raised above the upper surface of the molten glass to prevent molten glass from contacting an upper surface of the catcher.

Abstract: The invention relates to a device capable of rotating about an axis (6), for the refining and homogenization of glass, comprising a receptacle (1) intended to receive the molten glass to be treated, a vacuum compartment (2) and at least one glass outlet orifice (5, 19), furthermore including a conveying means (7, 8, 17, 18) for conveying the molten glass from the feed receptacle (1) to the vacuum compartment (2). It also relates to a process for manufacturing substrates employing the device according to the invention, and to the substrates thus manufactured.

Abstract: The sleeve-type glass melt agitator has a rotatable cylindrical sleeve provided with openings or small loops in its outer surface. The sleeve type agitator is arranged vertically in a glass melt feed channel in a glass melt feed system for making glass tubes or pipes according to the Vello or down-drawn process. During formation of glass tubes or pipes from the glass melt the sleeve-type agitator is rotated as the glass melt flows downward to prevent formation of schlieren in the glass melt, which causes glass material losses.

Abstract: A molten glass pump preferably includes one or more pumps which form either a single-stage apparatus or are combined in series to form a multi-stage apparatus. The exact configuration depends on the required process pressure and the required degree of glass homogenization. Examples of the invention include an auger pump and a mixing auger pump which have varying degrees of mixing action, as well as a homogenizing pump which provides some pumping action but is primarily a homogenizer. All three pumps preferably include a centerline flow recirculation feature which remixes inhomogeneous glass into the incoming glass stream. A counter-rotating sleeve, which straightens the glass flow exiting the apparatus and provides an additional flow recirculation path, is also preferably included.

Abstract: Apparatus for forming a cased glass stream having an inner core glass surrounded by an outer casing glass includes a first orifice for receiving core glass from a first source. A second orifice is vertically spaced beneath and aligned with the first orifice, and is surrounded by a chamber that communicates with the second orifice through a gap between the first and second orifices. A spout delivers casing glass from a second source through a tube to the chamber in such a way that glass flows by gravity from the first and second sources through the orifices to form the cased glass stream. Rate of glass flow through the second or casing glass source is measured and compared with one or more preset limits. Rate of casing glass flow from the second source to the chamber surrounding the orifices is adjusted when rate of flow through the second source departs from the preset limit. In this way, a desired ratio of casing glass to core glass is automatically maintained.

Abstract: A bushing including a tip plate having an orifice region including orifices to permit flow of a molten fiberizable material therethrough; a reservoir for supplying molten fiberizable material to the orifices; and a substantially planar perforated plate positioned within the reservoir generally parallel to and substantially coextensive with the orifice region of the tip plate, the perforated plate including a central region and a peripheral region surrounding the central region, each of the central region and the peripheral region of the perforated plate having a plurality of openings to permit flow of molten fiberizable material therethrough, wherein average head loss of molten material flowing through the central region of the perforated plate is greater than average head loss of molten material flowing through the peripheral region of the perforated plate.

Abstract: A basin for a forehearth of a glass-making furnace having an internal volume divided into upper and lower portions by an annular shoulder is described wherein the horizontal cross-sectional area of the upper portion is significantly greater than that of the lower portion. The base of the basin has a glass discharge outlet therein. In use, the discharge outlet is aligned with a relatively movable cylinder which acts as a flow metering valve. The cylinder can be rotated about its axis at a constant or adjustable speed, or the cylinder can be non-rotating and have a separately driven stirrer movable about it to prevent or reduce the formation of stagnant areas.

Abstract: The refractory tube controlling the flow of glass from a glass feeder bowl is combined with a rotary stirring device used to control surface cord into one unit, herein called a "Tubex"; thereby eliminating one of the two rotary drive mechanisms and also eliminating alignment and relative rotary speed problems. The stirrers are diamond-shaped platinum-rhodium alloy blades connected to the refractory element, preferably as three, equally-spaced stirrers at a common radius on the rotated Tubex element. A novel rotary support mounting and drive for said element is provided. The Tubex is used in TV panel glass manufacturing.

Abstract: A swing out support frame is provided on X-Y slide support structure such that one of several different diameter refractory tubes can be supported in a fixed spout bowl for rotation inside the bowl, and also for electrically controlled and non-electrically dependent vertical movement of the tube inside the bowl.

Abstract: A continuous tank-type glass melting furnace includes a melting zone into which raw materials are charged and reduced to a molten state. The molten glass then flows through a relatively narrow waist or conditioning area to refining and conditioning zones, and is then withdrawn as a continuous ribbon or sheet. Within the waist area there is provided a plurality of stirrers whose mixing and kneading action assist in homogenizing the glass as it flows through the restricted area. Each stirrer is connected to and driven by its own individual power unit so that the speed and direction of rotation of individual stirrers can be independently regulated and synchronized. Individual stirrers can also be removed and replaced with little or no interruption in operation of the remaining units.