With Application Of Lateral Tension To Edge Portion Of Moving Sheet Patents (Class 65/91)
  • Patent number: 9676579
    Abstract: A manufacturing method for a glass roll includes drawing a glass film downward vertically from a forming device, converting a delivery direction of the glass film from a vertical direction to a horizontal direction, continuously delivering the glass film to a downstream side by a horizontal conveyance section, and rolling the glass film into a roll shape on a downstream side of the horizontal conveyance section. While the glass film is supported in surface contact by an endless belt serving as a support section, which is provided in the horizontal conveyance section, a rolling force equal to or less than a static friction force, which is generated by a self-weight of the glass film between the glass film and the endless belt, is imparted to the glass film.
    Type: Grant
    Filed: May 16, 2012
    Date of Patent: June 13, 2017
    Assignee: NIPPON ELECTRIC GLASS CO., LTD.
    Inventors: Koichi Mori, Akio Nakabayashi
  • Patent number: 9388065
    Abstract: A glass manufacturing apparatus is described herein that comprises a forming device configured to produce a glass ribbon and a pull roll device which draws the glass ribbon downward from the forming device. The pull roll device has a first roll apparatus, a second roll apparatus, and a third roll apparatus. The pull roll device is configured to at least independently operate the first roll apparatus and the second roll apparatus such that at least one of a first upstream pair of draw rolls rotates with a substantially constant torque and at least one of a first downstream pair of draw rolls rotates with a substantially constant angular velocity. In further examples, methods of manufacturing a glass ribbon are provided.
    Type: Grant
    Filed: May 29, 2013
    Date of Patent: July 12, 2016
    Assignee: Corning Incorporated
    Inventors: Anmol Agrawal, Steven Roy Burdette, Gautam Narendra Kudva, Michael Yoshiya Nishimoto, Vinay Patel
  • Patent number: 9038418
    Abstract: Methods and apparatuses for managing pulling forces applied to a glass ribbon in a draw apparatus are disclosed. The method includes applying a front-side and a rear-side drive torque to a glass. The method further includes calculating automatically with the at least one electronic controller a front-side and a rear-side average pulling force applied to the glass ribbon and corresponding to a first time period of at least one rotation of the front-side or rear-side stub roller, respectively. The front-side average pulling force and the rear-side average pulling force are compared to establish a pulling force differential between the front-side average pulling force and the rear-side average pulling force. One or more of the front-side drive torque or the rear-side drive torque are modified to decrease the pulling force differential between the front-side average pulling force and the rear-side average pulling force.
    Type: Grant
    Filed: September 25, 2012
    Date of Patent: May 26, 2015
    Assignee: Corning Incorporated
    Inventors: Chris Scott Kogge, Gautam Narendra Kudva, Michael Yoshiya Nishimoto
  • Publication number: 20150096330
    Abstract: A glass manufacturing apparatus comprises a forming device configured to produce a glass ribbon and a control device configured to independently operate a first pull roll apparatus, a second pull roll apparatus, and a third pull roll apparatus such that at least one of a first upstream pair of draw rolls rotates with a substantially constant torque, at least one of a first midstream pair of draw rolls rotates with a substantially constant torque, and at least one of a first downstream pair of draw rolls rotates with a substantially constant angular velocity. In further examples, methods of manufacturing a glass ribbon are provided.
    Type: Application
    Filed: October 4, 2013
    Publication date: April 9, 2015
    Applicant: Corning Incorporated
    Inventors: Tomohiro Aburada, Steven Roy Burdette, Masumi Kihata, Chris Scott Kogge, Gautam Narendra Kudva, Michael Yoshiya Nishimoto, Gary Graham Squier, David John Ulrich
  • Publication number: 20140352356
    Abstract: Methods of forming a glass ribbon with a glass forming apparatus including a first glass roll device are disclosed. The methods include a step (I) of drawing the glass ribbon along a draw direction with the glass forming apparatus. Also included is a step (II) of adjusting a first roll member relative to a first support structure of the first glass roll device by translating the first roll member in a first linear direction parallel to a linear adjustment axis of the first support structure while the first roll member is adjustably mounted to the first support structure. Also included is a step (III) of contacting a first surface of the glass ribbon with the first roll member at a first adjusted contact location of the glass ribbon. Also disclosed are corresponding glass forming apparatus configured to form glass ribbons and draw the glass ribbons in a draw direction.
    Type: Application
    Filed: May 22, 2014
    Publication date: December 4, 2014
    Applicant: Corning Incorporated
    Inventors: James Gary Anderson, Lewis Kirk Klingensmith
  • Publication number: 20140283554
    Abstract: A glass manufacturing system and method are described herein for forming a high quality thin glass sheet. In one embodiment, the glass manufacturing system and method use at least one of a compensated rolling roll, a temperature controlled environment and edge rolls to form a high quality thin glass sheet that has a thickness less than about 2 mm and more preferably less than about 100 ?m.
    Type: Application
    Filed: June 4, 2014
    Publication date: September 25, 2014
    Inventor: Allan Mark Fredholm
  • Patent number: 8794036
    Abstract: Disclosed are methods for compensating the varying weight of a glass ribbon the glass ribbon is drawn from a molten glass forming material, and an apparatus therefore. The weight compensating apparatus is configured to apply a force to the glass ribbon that is inversely proportional to the weight of the glass ribbon such that as the glass ribbon weight increases, the force applied to the glass ribbon by the weight compensating device decreases.
    Type: Grant
    Filed: November 23, 2011
    Date of Patent: August 5, 2014
    Assignee: Corning Incorporated
    Inventors: Shawn R. Markham, Jae H. Yu
  • Patent number: 8726695
    Abstract: A manufacturing apparatus for a thin glass sheet includes a forming member main body configured to form the thin glass sheet by fusing together, at a lower end portion of the forming member main body, streams of molten glass, which have overflown from an overflow trough to both sides of the forming member main body, under a state in which the streams of the molten glass are caused to flow down along outer surface portions having a substantially wedge shape. The manufacturing apparatus also includes a pair of covering members fitted onto both widthwise end portions of the forming member main body, respectively, the pair of covering members forming restricting wall portions for restricting widthwise spread of the streams of the molten glass flowing down along the outer surface portions of the forming member main body.
    Type: Grant
    Filed: March 26, 2012
    Date of Patent: May 20, 2014
    Assignee: Nippon Electric Glass Co., Ltd.
    Inventors: Tomonori Kano, Noritomo Nishiura, Koki Ueda, Takahide Nakamura, Daisuke Nagata, Hidetaka Oda, Yuji Iwama
  • Patent number: 8720227
    Abstract: In a glass-ribbon conveyance assisting device which is applied to a glass-ribbon conveyance device configured to convey a glass ribbon on a plurality of rotating glass-conveyance rolls, the glass-ribbon conveyance assisting device includes a rotary drive section, a plurality of rolls configured to be rotated by the rotary drive section, an annular belt configured to rotate while running with flexion under a state where the rolls have been inserted into the belt, and a wheel configured to press the glass ribbon which is conveyed on the belt. The glass ribbon is conveyed on the belt by a drive of the belt under a state where width-directional both end portions of the glass ribbon are sandwiched between the belt and the wheel.
    Type: Grant
    Filed: October 16, 2008
    Date of Patent: May 13, 2014
    Assignee: Central Glass Company, Limited
    Inventors: Tomokazu Tsuji, Takanori Mifuji, Nobuhisa Tanise, Kinji Masui
  • Publication number: 20140075994
    Abstract: A pull roll apparatus and method are described herein that can control a cross-draw tension and a down-draw tension of a glass sheet while manufacturing the glass sheet. In one embodiment, the pull roll apparatus includes a first driven stub roll pair, a second driven stub roll pair and a control device (e.g., PLC) that controls the first and second driven stub roll pairs while a first edge portion of the glass sheet is drawn between two vertically downtilted rolls associated with the first driven stub roll pair and while an opposing second edge portion of the glass sheet is drawn between two vertically downtilted rolls associated with the second driven stub roll pair. If desired, the pull roll apparatus may include a pulling roll assembly (located below the first and second driven stub rolls) or another set of driven stub roll pairs (located below the first and second driven stub roll pairs).
    Type: Application
    Filed: November 25, 2013
    Publication date: March 20, 2014
    Applicant: Corning Incorporated
    Inventors: James Gary Anderson, Liam Ruan de Paor, Lewis Kirk Klingensmith, Patrick Aaron Parks, George Clinton Shay, Michael George Shultz, David John Ulrich
  • Patent number: 8661850
    Abstract: A method keeps the width of the manufactured sheet substantially the same by attaching edge directors for the formed sheet to the manufacturing apparatus structure instead of to the forming block. Thus, sheet glass may be manufactured to specification for a longer time with the same forming block. An additional method adjusts the width of the manufactured sheet by changing the distance between the edge directors. Thus sheet glass may be manufactured to different width specifications with the same forming block.
    Type: Grant
    Filed: July 3, 2012
    Date of Patent: March 4, 2014
    Assignee: Corning Incorporated
    Inventor: Richard B. Pitbladdo
  • Patent number: 8627684
    Abstract: A pull roll apparatus and method are described herein that can control a cross-draw tension and a down-draw tension of a glass sheet while manufacturing the glass sheet. In one embodiment, the pull roll apparatus includes a first driven stub roll pair, a second driven stub roll pair and a control device (e.g., PLC) that controls the first and second driven stub roll pairs while a first edge portion of the glass sheet is drawn between two vertically downtilted rolls associated with the first driven stub roll pair and while an opposing second edge portion of the glass sheet is drawn between two vertically downtilted rolls associated with the second driven stub roll pair. If desired, the pull roll apparatus may include a pulling roll assembly (located below the first and second driven stub rolls) or another set of driven stub roll pairs (located below the first and second driven stub roll pairs).
    Type: Grant
    Filed: October 29, 2007
    Date of Patent: January 14, 2014
    Assignee: Corning Incorporated
    Inventors: Michael George Shultz, George Clinton Shay, David John Ulrich, James Gary Anderson, Liam Ruan de Paor, Lewis Kirk Klingensmith, Patrick Aaron Parks
  • Patent number: 8627683
    Abstract: Methods for controlling thickness variations across the width of a glass ribbon (104) are provided. The methods employ a set of thermal elements (106) for locally controlling the temperature of the ribbon (104). The operating values for the thermal elements (106) are selected using an iterative procedure in which thickness variations measured during a given iteration are employed in a mathematical procedure which selects the operating values for the next iteration. In practice, the method can bring thickness variations of glass sheets within commercial specifications in just a few iterations, e.g., 2-4 iterations.
    Type: Grant
    Filed: June 6, 2012
    Date of Patent: January 14, 2014
    Assignee: Corning Incorporated
    Inventors: Steven Roy Burdette, Vladislav Y. Golyatin, Gautam Meda, Randy Lee Rhoads
  • Publication number: 20130319050
    Abstract: A glass manufacturing apparatus is described herein that comprises a forming device configured to produce a glass ribbon and a pull roll device which draws the glass ribbon downward from the forming device. The pull roll device has a first roll apparatus, a second roll apparatus, and a third roll apparatus. The pull roll device is configured to at least independently operate the first roll apparatus and the second roll apparatus such that at least one of a first upstream pair of draw rolls rotates with a substantially constant torque and at least one of a first downstream pair of draw rolls rotates with a substantially constant angular velocity. In further examples, methods of manufacturing a glass ribbon are provided.
    Type: Application
    Filed: May 29, 2013
    Publication date: December 5, 2013
    Applicant: Corning Incorporated
    Inventors: Anmol Agrawal, Steven Roy Burdette, Gautam Narendra Kudva, Michael Yoshiya Nishimoto, Vinay Patel
  • Patent number: 8528364
    Abstract: An apparatus for drawing a glass ribbon including an edge roll assembly that contacts the glass ribbon with a force that is dynamically altered by an actuator electrically coupled to a sensor that measures the force applied against the ribbon. Dynamic, or real-time, variation of the edge roll force minimizes stress variability in the glass ribbon and improves ribbon shape control.
    Type: Grant
    Filed: January 4, 2011
    Date of Patent: September 10, 2013
    Assignee: Corning Incorporated
    Inventors: James G. Anderson, L. Kirk Klingensmith, James P. Peris, David J. Ulrich
  • Publication number: 20130133371
    Abstract: A glass manufacturing apparatus comprises a forming device configured to produce a glass ribbon and a control device configured to independently operate a first pull roll apparatus and a second pull roll apparatus such that at least one of a first upstream pair of draw rolls rotates with a substantially constant torque and at least one of a first downstream pair of draw rolls rotates with a substantially constant angular velocity. In further examples, methods of manufacturing a glass ribbon are provided.
    Type: Application
    Filed: November 29, 2011
    Publication date: May 30, 2013
    Inventors: Steven Roy Burdette, Liam Ruan de Paor, Gautam Narendra Kudva, Gary Graham Squier, David John Ulrich
  • Publication number: 20130118206
    Abstract: An objective of the invention is to provide a glass-substrate manufacturing method that is capable of increasing the amount of production of glass substrates and improving warpage quality. A glass-substrate manufacturing method according to an aspect of the invention is a method for manufacturing glass substrates by employing a down-draw process. In down-draw processing, a molten glass is made to overflow from a forming member and formed into a sheet glass and the sheet glass is then cooled while being drawn in a downward-flow direction. In this glass-substrate manufacturing method, after the sheet glass has separated from the forming member and when the temperature of the sheet glass is within a temperature region ranging from a temperature higher than the softening point to a temperature near the annealing point, the sheet glass is cooled by maintaining the viscosity of side sections of the sheet glass within a range of 109.0-1014.5 poise while applying a tension toward the side sections.
    Type: Application
    Filed: December 19, 2012
    Publication date: May 16, 2013
    Inventors: Nobuhiro MAEDA, Hiroyuki KARIYA
  • Patent number: 8393178
    Abstract: Methods and apparatus for controlling the stress in, and the shape of, the glass ribbon (15) formed in a downdraw glass manufacturing process (e.g., the fusion downdraw process) are provided. In certain embodiments, the control is achieved by cooling the bead portions (21a, 21b) of the ribbon (15) at a rate which provides a heat flux Q?b at the thickest part of the bead (23a, 23b) which is given by Q?b=Q?q+?Q?, where (i) Q?q is the heat flux at a transverse position adjacent to the bead portion (21a, 21b) at which the ribbon's thickness equals 1.05*tcenter, where tcenter is the final thickness at the ribbon's center line (17), and (ii) ?Q??(tb/tq?1)Q?q+10 kilowatts/meter2, where tb is the thickness of the thickest part of the bead portion. The cooling can take place along the entire length of the ribbon (15) or at selected locations, e.g.
    Type: Grant
    Filed: August 23, 2011
    Date of Patent: March 12, 2013
    Assignee: Corning Incorporated
    Inventors: Kenneth William Aniolek, Steven Roy Burdette, Liam Ruan de Paor, Eunyoung Park
  • Publication number: 20130017409
    Abstract: A casting device for producing semiconductor material foil includes a casting frame and a substrate band. The casting frame is arranged for holding a molten semiconductor material and includes sidewalls of which an exit sidewall is located at an output position for the semiconductor material foil. The exit side wall is provided with an exit slit. The casting device further includes a local force exerting means to exert at the location of the exit slit a locally enlarged external force on the molten semi-conductor material to enlarge an outer pressure on the molten material at the exit slit.
    Type: Application
    Filed: February 8, 2011
    Publication date: January 17, 2013
    Inventors: Axel Georg Schoenecker, Eric De Jager, Eelko Gelbert Hoek, Pierre-Yves Pichon
  • Publication number: 20120266632
    Abstract: A method keeps the width of the manufactured sheet substantially the same by attaching edge directors for the formed sheet to the manufacturing apparatus structure instead of to the forming block. Thus, sheet glass may be manufactured to specification for a longer time with the same forming block. An additional method adjusts the width of the manufactured sheet by changing the distance between the edge directors. Thus sheet glass may be manufactured to different width specifications with the same forming block.
    Type: Application
    Filed: July 3, 2012
    Publication date: October 25, 2012
    Inventor: Richard B. Pitbladdo
  • Patent number: 8196431
    Abstract: Methods for controlling thickness variations across the width of a glass ribbon (104) are provided. The methods employ a set of thermal elements (106) for locally controlling the temperature of the ribbon (104). The operating values for the thermal elements (106) are selected using an iterative procedure in which thickness variations measured during a given iteration are employed in a mathematical procedure which selects the operating values for the next iteration. In practice, the method can bring thickness variations of glass sheets within commercial specifications in just a few iterations, e.g., 2-4 iterations.
    Type: Grant
    Filed: May 20, 2009
    Date of Patent: June 12, 2012
    Assignee: Corning Incorporated
    Inventors: Steven Roy Burdette, Vladislav Y Golyatin, Gautam Meda, Randy Lee Rhoads
  • Patent number: 8146388
    Abstract: An apparatus for drawing a glass ribbon including a shroud surrounding the glass ribbon and an edge roll that penetrates the shroud to contact the glass ribbon. The apparatus includes regulating a pressure within the seal assembly to be equal to or less than a pressure within the shroud and prevent ingress of relatively cooler outside gas into the hot interior of the shroud. The edge roll utilizes an air bearing to minimize friction that can produce periodic fluctuation of the ribbon as the edge roll is displaces in response to variations in the ribbon thickness or equipment dimensions.
    Type: Grant
    Filed: October 29, 2009
    Date of Patent: April 3, 2012
    Assignee: Corning Incorporated
    Inventors: James G. Anderson, L. Kirk Klingensmith, James P. Peris, David J. Ulrich
  • Patent number: 8113015
    Abstract: Methods for controlling the bow (shape) of a vertical glass ribbon (13) produced by a downdraw process are provided. The methods involve passing the ribbon (13) through a gas-filled vertical enclosure (23), e.g., a draw tower, whose bottom (31) is open to the atmosphere. The ribbon (13) acts as a septum that divides the enclosure's internal volume (29) into a first sub-volume (25) and a second sub-volume (27). Using the stack effect, a positive pressure difference is produced between the first sub-volume (25) and the second sub-volume (27) along at least a portion of the length of the enclosure (the DDZ). The edges of the ribbon (13) are constrained so that they do not move into the second sub-volume (27) over at least the DDZ. As a result, the ribbon bows with its concavity facing the first sub-volume (25) and its convexity facing the second sub-volume (27).
    Type: Grant
    Filed: June 17, 2009
    Date of Patent: February 14, 2012
    Assignee: Corning Incorporated
    Inventor: Steven R. Burdette
  • Publication number: 20110167873
    Abstract: An apparatus for drawing a glass ribbon including an edge roll assembly that contacts the glass ribbon with a force that is dynamically altered by an actuator electrically coupled to a sensor that measures the force applied against the ribbon. Dynamic, or real-time, variation of the edge roll force minimizes stress variability in the glass ribbon and improves ribbon shape control.
    Type: Application
    Filed: January 4, 2011
    Publication date: July 14, 2011
    Inventors: James G. Anderson, L. Kirk Klingensmith, James P. Peris, David J. Ulrich
  • Publication number: 20110094267
    Abstract: A method of producing glass sheets includes the step of fusion drawing a glass ribbon along a draw direction into a viscous zone downstream from a root of a forming wedge. The method further includes the step of drawing the glass ribbon into a setting zone downstream from the viscous zone, wherein the glass ribbon is set from a viscous state to an elastic state. The method further includes the steps of drawing the glass ribbon into an elastic zone downstream from the setting zone and stabilizing a region of the glass ribbon in the elastic zone along a width of the glass ribbon extending transverse with respect to the draw direction. A predetermined pressure differential between a first side and a second side of the glass ribbon is used to create the stabilized region. The method further includes the step of cutting a glass sheet from the glass ribbon, wherein the stabilized region inhibits shape instabilities from propagating upstream through the glass ribbon to the setting zone.
    Type: Application
    Filed: October 28, 2009
    Publication date: April 28, 2011
    Inventors: Kenneth William Aniolek, Rui Zhang
  • Patent number: 7685840
    Abstract: A method of minimizing distortion in a glass sheet manufacturing process wherein the stress in a parent sheet of glass is measured along each edge of the sheet. The stress data is then used to develop a distortion predictor for predicting the in-plane distortion which sub-sheets of the parent sheet are likely to exhibit when the parent sheet is cut into pre-determined sizes. The in-plane distortion may be predicted based on criteria established by the glass manufacturer, or supplied by an original equipment manufacturer (OEM).
    Type: Grant
    Filed: March 24, 2006
    Date of Patent: March 30, 2010
    Assignee: Corning Incorporated
    Inventors: Roger Alphee Allaire, Darren Ryan Courtright, Clive Darrell Gierbolini, Dean Veral Neubauer, Casey Allen Volino
  • Patent number: 7685841
    Abstract: In the formation of sheet glass by the overflow downdraw process, the width of usable sheet glass is maximized by downwardly flowing edge portions of the sheet over web-like members and thereafter over extensions which intersect with and are downwardly inclined relative to the web-like members to thin edge portions of the glass flow and maintain sheet width. The extension members are preferably removably attached to the web-like members, greatly facilitating replacement of the more easily damaged extension members.
    Type: Grant
    Filed: June 26, 2008
    Date of Patent: March 30, 2010
    Assignee: Corning Incorporated
    Inventors: Olus Naili Boratav, Steven Roy Burdette, David John Ulrich
  • Publication number: 20100043495
    Abstract: In a vertical glass drawing process, an edge guiding assembly (33) located between a glass forming apparatus (41) and a glass sheet separating apparatus (20) reduces horizontal motion of the glass ribbon (13) from which the glass sheets (11) are removed and results in the reduction of the difference in stress levels between the top and bottom edges of a glass sheet (11) made by the process. The edge guiding assembly also provides a reduction of the variation of stress levels between successive sheets of glass made by the vertical drawing process.
    Type: Application
    Filed: June 27, 2007
    Publication date: February 25, 2010
    Inventors: Thomas Edward Kirby, Liam Ruan de Paor
  • Publication number: 20100031702
    Abstract: Provided is a glass ribbon producing apparatus (1), which feeds molten glass (Y) to a forming member (3), and causes the molten glass (Y) to flow downward from the forming member (3) to form a sheet-like glass ribbon (G), including guiding portion (6) which is disposed on a transport route, for the glass ribbon (G) caused to flow downward, and has a gap with a dimension larger than a sheet thickness of each of both widthwide end portions in a thickness direction of the glass ribbon (G) for guiding only the widthwide end portions of the glass ribbon (G) within a range of the gap.
    Type: Application
    Filed: October 9, 2007
    Publication date: February 11, 2010
    Inventors: Masahiro Tomamoto, Hidetaka Oda
  • Publication number: 20090223250
    Abstract: There is provided polarizing glass having a high extinction ratio in a broad band. A manufacturing method of the polarizing glass containing elongated metal particles dispersed and oriented within glass includes an elongation step of forming mother glass after heat-treatment into a preform, of heating the preform at such temperature that the viscosity of the glass becomes about 1×108 to 1×1014 poise, of applying stress of about 200 kg/cm2 to 500 kg/cm2 to the preform while moving the preform within an electric furnace with feeding speed of 10 mm/min. or less and of elongating the preform as an elongated sheet with pulling speed of 150 mm/min.
    Type: Application
    Filed: December 12, 2007
    Publication date: September 10, 2009
    Applicant: ARISAWA MFG. CO., LTD.
    Inventors: Masahiro Ichimura, Yuichi Aoki
  • Publication number: 20090217704
    Abstract: In an apparatus for manufacturing thin sheet glass, comprising a forming body 12 including a main body having a cross-sectional shape converging downwardly, the main body being configured to converging streams of molten glass into a single glass ribbon at a lower converged edge portion thereof, the streams of the molten glass flowing down along both surface of the main body; and edge members, the edge members being configured to restrict a width of the molten glass, wherein the glass ribbon formed by the forming body 12 is downwardly pulled to form thin sheet glass; the apparatus further includes a non-contact support member disposed in the vicinity of the lower converged edge portion of the main body, the non-contact support member being configured to form a thin gas layer on a supporting surface thereof, wherein the glass ribbon is supported over an entire width thereof in a non-contact way by the non-contact support member in a course wherein the glass ribbon is downwardly pulled.
    Type: Application
    Filed: May 1, 2009
    Publication date: September 3, 2009
    Applicant: ASAHI GLASS COMPANY, LIMITED
    Inventors: YOSHIHIRO SHIRAISHI, Osamu Sakamoto
  • Publication number: 20090019892
    Abstract: The present invention relates to a process for manufacturing flat sheets of a glass-based material and to a device associated with the process.
    Type: Application
    Filed: March 10, 2006
    Publication date: January 22, 2009
    Inventors: Allan Mark Fredholm, Claude Francois Maurice Gille, Christophe Pierron, Xavier Tellier
  • Publication number: 20080276646
    Abstract: A conformable nosing device is described herein which conforms to have a bowed shape that substantially matches a bowed shape of a glass sheet and which engages the glass sheet to help minimize the motion of the glass sheet and to help reduce the stress within the glass sheet while the glass sheet is being scored and separated into individual glass sheets. In addition, the conformable nosing device can include a passive nosing device which can be controlled to further help minimize the motion of the glass sheet while the glass sheet is being scored and separated into individual glass sheets.
    Type: Application
    Filed: May 9, 2007
    Publication date: November 13, 2008
    Inventors: Paul Gregory Chalk, Patrick Jean Pierre Herve, Yawei Sun, Naiyue Zhou
  • Publication number: 20080184741
    Abstract: The method of making thin glass panes includes conveying a glass melt through a vertical inlet to a drawing tank with a slit nozzle; drawing a glass ribbon downward from the slit nozzle; setting a total throughput by setting length and cross section of the inlet and by heating and cooling the inlet to control glass melt viscosity so that pressure in the inlet decreases; and setting a throughput per unit of length in a lateral direction along the glass ribbon via nozzle system geometry and by heating and cooling of the drawing tank and slit nozzle to control melt viscosity, so that glass does not wet an underside of the slit nozzle near a breaking edge. The setting of the total throughput and the throughput per unit length are largely decoupled to simplify process control. An inventive apparatus for performing the method is also disclosed.
    Type: Application
    Filed: October 4, 2007
    Publication date: August 7, 2008
    Inventors: Rudolf Mueller, Horst Loch, Dirk Sprenger, Jose Zimmer, Holger Wegener
  • Patent number: 7231786
    Abstract: The present invention relates to a process for manufacturing flat sheets of a glass-based material and to an apparatus therefor. The process comprises providing a glass preform, heating the glass preform in a furnace, forming a gob and a pre-sheet, removing the gob and drawing the glass pre-sheet into a flat glass sheet. Also provided is an apparatus for drawing a glass preform into a glass sheet, the apparatus comprising a draw furnace, stretching arms for stretching and drawing the pre-sheet into a glass sheet, and opposing edge rollers for applying a downward force on the glass sheet. The draw furnace may include a plurality of individual heating elements, the temperature of each heating element capable of being separately controlled. The apparatus may further include an annealing furnace for annealing the glass sheet.
    Type: Grant
    Filed: July 29, 2004
    Date of Patent: June 19, 2007
    Assignee: Corning Incorporated
    Inventors: Patrick J Cimo, Michael T Murtagh, Mark L Powley
  • Patent number: 6758064
    Abstract: When a glass substrate for a liquid crystal display is manufactured using the downdraw method. strain caused by differences in the tempsrature of the sheet glass achieved as a result of cooling are reduced. Furth rtore. minute strain that occurs when the sheet glass manufactured using the downdraw method is out into smaller pieces is inhibited. When the sheet glass 8 is manufactured using the downdraw method. a temperature distribution is formed in the widthwise direction of the sheet glass 8 by the heat treating unit 9 used in the slowly cooling process after molding. This temperature distribution is a distribution that can offset the temperature distribution in the sheet glass 8 caused by the fact that the thickness of the sheet glass 8 after molding is greater in the edge areas than that in the surface area.
    Type: Grant
    Filed: March 9, 2001
    Date of Patent: July 6, 2004
    Assignee: NH Techno Glass Corporation
    Inventor: Hiroyuki Kariya
  • Patent number: 6502423
    Abstract: A method and apparatus is described, with which individual rectangular glass panes of thickness between 0.03 mm and 2 mm can be cut from a glass band (2) drawn vertically from a hot forming device (1) in an in-line process with reduced rejects and reduced waste. The method provides that the glass band (2) drawn vertically downward through a vertical zone is cooled below a lower cooling point of the glass and subsequently is deflected through a bending zone (3b) with a bending radius between 0.1 m and 4 m into a horizontal zone (3c) in which it is horizontally oriented. The vertical alignment of the glass band (2) in the vertical zone (3a) is continuously monitored. At least one cutting process is performed on the horizontally oriented glass band (2) in the horizontal zone (3c). The device (20) for monitoring the vertical alignment of the glass band (2) includes at least three sensors (22a, 22b, 22c; 22a′, 22b′, 22c′) that detect the glass edges These sensors can be mechanical rollers.
    Type: Grant
    Filed: April 26, 2000
    Date of Patent: January 7, 2003
    Assignee: Schott Glas
    Inventors: Heinrich Ostendarp, Andreas Berndt, Rolf Suennemann
  • Patent number: 4824463
    Abstract: A process and apparatus for ceramising planar, transparent, substantially-rectangular sheets of glass-ceramic characterized in that the sheets are vertically suspended during the conversion process.
    Type: Grant
    Filed: September 4, 1987
    Date of Patent: April 25, 1989
    Assignee: Schott Glaswerke
    Inventors: Eckard Neuhoff, Friedrich-Georg Schroder-Gerlach
  • Patent number: 4612030
    Abstract: A method and apparatus are disclosed for making ornamental glass. A molten glass mixture, formed into a continuous plastic sheet, is subjected to a single or multiple bilateral stretching before being annealed.
    Type: Grant
    Filed: June 11, 1985
    Date of Patent: September 16, 1986
    Inventor: Ronald E. Smids
  • Patent number: 4572731
    Abstract: In a float glass process, traction of an attenuating device on the glass ribbon is enhanced by a member buoyantly engaging the underside of the ribbon.
    Type: Grant
    Filed: December 24, 1984
    Date of Patent: February 25, 1986
    Assignee: PPG Industries, Inc.
    Inventor: O. Franklin Williams, Jr.
  • Patent number: 3990876
    Abstract: An improved method of making films, sheets or plates of a transparent plastics material of high optical quality comprises depositing a solution, molten mass or reaction mixture which yields the solid plastics on drying or hardening on a moving glass ribbon having a smooth upper surfce. The ribbon may be made by the float glass process. The plurality of plastics layer may be deposited one on another.
    Type: Grant
    Filed: January 15, 1975
    Date of Patent: November 9, 1976
    Assignee: Saint-Gobain Industries
    Inventors: Pierre Rene Heymes, Rudolf Pelzer