Patent Publication Number: US-2017369353-A1

Title: Apparatus and methods for producing a glass ribbon

Description:
FIELD 
     The present invention relates generally to apparatus and methods for producing glass ribbon and, more particularly, to apparatus and methods for producing a glass ribbon with a plurality of cooling coils extending along a cooling axis that is transverse to a draw direction of the glass ribbon. 
     BACKGROUND 
     It is known to draw a glass ribbon with a draw device. The glass ribbon may be subsequently divided to produce a plurality of glass sheets that may be employed in a wide range of applications. The glass ribbon is known to be drawn in a viscous state for eventual cooling into an elastic state where final features are permanently set into the glass sheet. 
     SUMMARY 
     The following presents a simplified summary of the disclosure in order to provide a basic understanding of some example aspects described in the detailed description. 
     In one example aspect, an apparatus for producing glass ribbon comprises a drawing device configured to draw molten glass into a glass ribbon in a draw direction along a draw plane of the apparatus. The apparatus further includes a cooling apparatus including a plurality of cooling coils positioned along a cooling axis of the apparatus extending transverse to the draw direction. The cooling coils are configured to control a transverse temperature profile of the glass ribbon along the cooling axis. Each cooling coil is fabricated from at least one tube and configured to circulate fluid through the at least one tube to remove heat from the cooling coil. 
     In another example aspect, a method of producing a glass ribbon includes the step of drawing molten glass in a draw direction into a viscous zone to form a glass ribbon including opposed edges extending in the draw direction. The opposed edges are spaced apart along a width of the glass ribbon that is transverse to the draw direction. The method further includes the step of drawing the molten glass from the viscous zone 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 step of drawing the glass ribbon into an elastic zone downstream from the setting zone. The apparatus also includes the step of controlling a transverse temperature profile of the glass ribbon along the width of the glass ribbon in at least one of the viscous zone, the setting zone and the elastic zone. The step of controlling the temperature profile includes selectively removing heat from at least one of a plurality of cooling coils positioned along a cooling axis that is transverse to the draw direction. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       These and other features, aspects and advantages of the present disclosure are better understood when the following detailed description is read with reference to the accompanying drawings, in which: 
         FIG. 1  is a schematic illustration of an example fusion draw apparatus including a cooling apparatus in accordance with aspects of the disclosure; 
         FIG. 2  illustrates a sectional view of a forming vessel of the fusion draw apparatus of  FIG. 1 ; 
         FIG. 3  schematically illustrates a glass ribbon being drawn off the forming vessel of  FIG. 1 ; 
         FIG. 4  illustrates a cooling apparatus in accordance with one example aspect of the disclosure; 
         FIG. 5  is a cross-sectional view along line  5 - 5  of  FIG. 4 , illustrating features of the cooling apparatus of  FIG. 4 ; 
         FIG. 6  is a cross-sectional view along line  6 - 6  of  FIG. 4 , illustrating features of the cooling apparatus of  FIG. 4 ; and 
         FIG. 7  illustrates a method of replacing a control module of the cooling apparatus with a new control module. 
     
    
    
     DETAILED DESCRIPTION 
     Methods will now be described more fully hereinafter with reference to the accompanying drawings in which example embodiments of the disclosure are shown. Whenever possible, the same reference numerals are used throughout the drawings to refer to the same or like parts. However, this disclosure may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. 
     Apparatus can be provided to form a glass ribbon for subsequent processing into glass sheets.  FIG. 1  schematically illustrates a fusion draw apparatus  101  although up draw, slot draw or other glass forming techniques may be used with aspects of the disclosure in further examples. With such fusion draw process techniques, the present disclosure provides for control of viscosity and temperature cooling curves to provide process stability and facilitate quality performance. For instance, proper cooling below a forming vessel can help provide the glass ribbon with sufficient cooling and high-enough viscosity to minimize ribbon bagginess, i.e., the tendency of the ribbon to deform uncontrollably, such as unevenly under its own weight. Proper cooling below the forming vessel can also help stabilize thickness and provide shape control. Furthermore, proper cooling can help provide proper transitioning and conditioning of the glass into the visco-elastic region where final glass flatness, stress, and shape is controlled. 
     As illustrated, the fusion draw apparatus  101  can include a melting vessel  105  configured to receive batch material  107  from a storage bin  109 . The batch material  107  can be introduced by a batch delivery device  111  powered by a motor  113 . An optional controller  115  can be configured to activate the motor  113  to introduce a desired amount of batch material  107  into the melting vessel  105 , as indicated by arrow  117 . A metal probe  119  can be used to measure a glass melt  121  level within a standpipe  123  and communicate the measured information to the controller  115  by way of a communication line  125 . 
     The fusion draw apparatus  101  can also include a fining vessel  127 , such as a fining tube, located downstream from the melting vessel  105  and coupled to the melting vessel  105  by way of a first connecting tube  129 . A mixing vessel  131  such as a stir chamber, can also be located downstream from the fining vessel  127  and a delivery vessel  133  may be located downstream from the mixing vessel  131 . As shown, a second connecting tube  135  can couple the fining vessel  127  to the mixing vessel  131  and a third connecting tube  137  can couple the mixing vessel  131  to the delivery vessel  133 . As further illustrated, a downcomer  139  can be positioned to deliver glass melt  121  from the delivery vessel  133  to a fusion draw machine  140 . The fusion draw machine  140  can include the a forming vessel  143  provided with an inlet  141  to receive glass melt from the downcomer  139 . 
     As shown, the melting vessel  105 , fining vessel  127 , the mixing vessel  131 , delivery vessel  133 , and forming vessel  143  are examples of glass melt stations that may be located in series along the fusion draw apparatus  101 . 
     The melting vessel  105  is typically made from a refractory material, such as refractory (e.g. ceramic) brick. The fusion draw apparatus  101  may further include components that are typically made from platinum or platinum-containing metals such as platinum-rhodium, platinum-iridium and combinations thereof, but which may also comprise such refractory metals such as molybdenum, palladium, rhenium, tantalum, titanium, tungsten, ruthenium, osmium, zirconium, and alloys thereof and/or zirconium dioxide. The platinum-containing components can include one or more of the first connecting tube  129 , the fining vessel  127  (e.g., finer tube), the second connecting tube  135 , the standpipe  123 , the mixing vessel  131  (e.g., a stir chamber), the third connecting tube  137 , the delivery vessel  133  (e.g., a bowl), the downcomer  139  and the inlet  141 . The forming vessel  143  is also made from a refractory material and is designed to form the glass ribbon  103 . 
       FIG. 2  is a cross-sectional perspective view of the fusion draw apparatus  101  along line  2 - 2  of  FIG. 1 . As shown, the forming vessel  143  includes a forming wedge  201  comprising a pair of downwardly inclined forming surface portions  203 ,  205  extending between opposed ends of the forming wedge  201 . The pair of downwardly inclined forming surface portions  203 ,  205  converge along a draw direction  207  to form a root  209 . A draw plane  211  extends through the root  209  wherein the glass ribbon  103  may be drawn in the draw direction  207  along the draw plane  211 . As shown, the draw plane  211  can bisect the root  209  although the draw plane  211  may extend at other orientations with respect to the root  209 . 
     The fusion draw apparatus  101  for fusion drawing a glass ribbon can also include at least one edge roller assembly including a pair of edge rollers configured to engage a corresponding edge  103   a ,  103   b  of the glass ribbon  103  as the ribbon is drawn off the root  209  of the forming wedge  201 . The pair of edge rollers facilitates proper finishing of the edges of the glass ribbon. Edge roller finishing provides desired edge characteristics and proper fusion of the edge portions of the molten glass being pulled off opposed surfaces of an edge director  212  associated with the pair of downwardly inclined forming surface portions  203 ,  205 . As shown in  FIG. 2 , a first edge roller assembly  213   a  is associated with the first edge  103   a .  FIG. 3  shows a second edge roller assembly  213   b  associated with the second edge  103   b  of the glass ribbon  103 . Each edge roller assembly  213   a ,  213   b  can be substantially identical to one another although the pairs of edge rollers may have different characteristics in further examples. 
     As shown in  FIG. 3 , the fusion draw apparatus  101  can further include a first and second pull roll assembly  301   a ,  301   b  for each respective edge  103   a ,  103   b  to facilitate pulling of the glass ribbon  103  in the draw direction  207  of the draw plane  211 . 
     The fusion draw apparatus  101  can further include a cutting device  303  that allows the glass ribbon  103  to be cut into distinct glass sheets  305 . The glass sheets  305  may be subdivided into individual glass sheets for incorporating in the various display devices, such as a liquid crystal display (LCD). Cutting devices may include laser devices, mechanical scoring devices, traveling anvil machines and/or other devices configured to cut the glass ribbon  103  into the distinct glass sheets  305 . 
     Referring to  FIG. 2 , in one example, the glass melt  121  can flow into a trough  215  of the forming vessel  143 . The glass melt  121  can then simultaneously flow over corresponding weirs  217   a ,  217   b  and downward over the outer surfaces  219   a ,  219   b  of the corresponding weirs  217   a ,  217   b . Respective streams of glass melt then converge along the downwardly inclined forming surface portions  203 ,  205  to the root  209  of the forming vessel  143 . A glass ribbon  103  is then drawn off the root  209  in the draw plane  211  along draw direction  207 . 
     Turning to  FIG. 3 , the glass ribbon  103  is drawn from the root  209  in the draw direction  207  of the draw plane  211  from a viscous zone  307  to a setting zone  309 . In the setting zone  309 , the glass ribbon  103  is set from a viscous state to an elastic state with the desired cross-sectional profile. The glass ribbon is then drawn from the setting zone  309  to an elastic zone  311 . In the elastic zone  311 , the profile of the glass ribbon from the viscous zone  307  is frozen as a characteristic of the glass ribbon. While the set ribbon may be flexed away from this configuration, internal stresses can cause the glass ribbon to bias back to the original set profile. 
     Any of the apparatus for producing glass ribbon can include a cooling apparatus configured to control a transverse temperature profile of the glass ribbon along a cooling axis. For example, the fusion draw apparatus  101  is illustrated as including a cooling apparatus.  FIG. 4  illustrates one example cooling apparatus  401  in accordance with aspects of the disclosure although other cooling apparatus configurations may be provided in further examples. The cooling apparatus  401 , for example, may be part of the fusion draw machine  140  that has been schematically represented in  FIGS. 1-3 . The details of the cooling apparatus  401  are not illustrated in  FIGS. 1-3  for clarity but aspects of an example cooling apparatus  401  is more fully shown in  FIGS. 4-7 . 
       FIGS. 4-7  illustrate an example apparatus for producing glass ribbon that may comprise the illustrated fusion draw apparatus  101 , although up draw or other glass forming apparatus may also be provided with a cooling apparatus in accordance with aspects of the disclosure. As shown in  FIGS. 4-6 , the illustrated cooling apparatus  401  can include a plurality of cooling coils  403   a - e  positioned along a cooling axis  405   a  of the fusion draw apparatus  101 . As illustrated, the cooling axis  405   a  can be designed to extend transverse, such as substantially perpendicular, to the draw direction  207 . For example, as shown in  FIG. 3 , the cooling axis  405   a  can be substantially perpendicular to the draw direction  207  while being positioned in an upper portion of the setting zone  309  where the glass ribbon  103  begins to transition from a viscous state to an elastic state. As shown in  FIG. 4 , in such a position a heat shield  406  may be provided to protect structures of the fusion draw machine  140 . The heat shield  406  can comprise a SiC material although other materials may be used in further examples. 
     In addition or alternatively, as shown in  FIGS. 3 and 4 , the cooling axis  405   b  may be located in a lower portion of the setting zone  309  where the glass ribbon  103  finalizes the transition from the viscous state to an elastic state. Still further, as shown schematically in  FIG. 3 , the cooling axis  405   c  may be located in the elastic zone  311  where the glass ribbon is fully set in the elastic state. In fact, it will be appreciated that the cooling axis can be located at various positions of the glass ribbon traveling from the forming vessel  143 . For instance, in the illustrated example, the cooling axis may be located at various alternative positions of the glass ribbon between the root  209  of the forming wedge  201  and the cutting device  303 . 
     Providing a cooling axis may be beneficial to help control a transverse temperature profile of the glass ribbon  103  along the cooling axis. For example, the transverse temperature profile can be located substantially along a profile axis of the glass ribbon.  FIG. 4  illustrates an example where a temperature profile axis  407   a  of the glass ribbon  103  is substantially perpendicular to the draw direction  207  and parallel to the corresponding cooling axis  405   a . Likewise, another temperature profile axis  407   b  of the glass ribbon  103  is substantially perpendicular to the draw direction  207  and parallel to the corresponding cooling axis  405   b . As such, it will be appreciated that the profile axis (e.g.,  407   a  and  407   b ) may be substantially perpendicular to the draw direction  207  and likewise substantially perpendicular to the elongated axis of the glass ribbon. Still further the profile axis may be substantially perpendicular to the edges  103   a ,  103   b  of the glass ribbon although the profile axis may be oriented at an oblique angle with respect to the edges  103   a ,  103   b  and/or the draw direction  207 . 
     As such, apparatus and methods of the present disclosure can facilitate control of the transverse temperature of the glass ribbon  103  along the cooling axis at various locations along the draw direction  207  of the glass ribbon  103 . Allowing control of the transverse temperature of the glass ribbon can facilitate control of the transverse viscosity and/or temperature cooling curves in a transverse direction of the glass ribbon  103 . 
     The plurality of cooling coils  403   a - e  referenced in  FIG. 4  is illustrated in  FIGS. 5-6 .  FIG. 5  is a cross-sectional view of portions of the fusion draw machine  140  along line  5 - 5  of  FIG. 3 . For illustrative purposed,  FIG. 5  shows a plurality of cooling coils  403   a - e  including five cooling coils  403   a - e  although more or less cooling coils may be provided in further examples. 
     Each cooling coil can be fabricated from at least one tube and configured to circulate fluid through the at least one tube to remove heat from the cooling coil. As such, liquid and/or gas cooling fluid may be used to circulate through the tube without physically contacting the glass ribbon or other portions of the fusion draw apparatus  101 . In one example, the tube can be configured to circulate liquid to increase the rate at which heat transfer is removed from the respective cooling zone. As such, the at least one tube can move liquid into the vicinity of the cooling zone without contaminating electrical components or other structures of the fusion draw machine. Thus, the benefits of high heat transfer associated with liquid cooling with a cooling coil including at least one tube can be achieved without contacting the other portions of the apparatus. 
     In one example, the at least one cooling coil can include a plurality of cooling coils or segments of coils that are joined together. In further examples, one or more of the coils may be formed with a seam, either at the interfaces between the segments and/or along a longitudinal axis of the cooling tubes. For example, a plurality of straight segments may be welded, soldered, or otherwise joined together with a plurality of elbow or U-shaped segments. Alternatively, as shown in  FIG. 5 , the at least one tube of each cooling coil can comprise a single substantially continuous tube  501  that is bent into a compact shape  503 . The single substantially continuous tube  501  can be provided without any weld or solder seams along a compact shape  503  of the cooling coil (e.g., along a longitudinal axis of a cooling tube) although the compact shape  503  may be provided by more than one tube and/or a tube with seams. However, providing the cooling coil with the illustrated single continuous tube without seams can reduce the probability of cracks, fluid leaks and/or catastrophic failure of the cooling coil that may otherwise damage electrical and other components of the apparatus in the vicinity of the cooling coils. 
     Various compact shapes may be used in accordance with aspects of the disclosure. For example, as shown in  FIG. 5 , the compact shape  503  can include a serpentine shape. The serpentine shape can allow the at least one tube to achieve a compact form to increase the surface area of the cooling coil within the corresponding cooling zone. For instance, as shown in  FIG. 5 , the serpentine shape can include a plurality of straight segments  505  joined together at bent ends  507 . 
     As shown in  FIG. 4 , the compact shape  503  of each of the cooling coils  403   a - e  can extend along a cooling plane  411 . In such a configuration, the serpentine shape can substantially extend along the cooling plane  411  such that the straight segments  505  and bent ends  507  are substantially coplanar with one another. In such an example, relatively consistent cooling can be achieved above and below the temperature profile axis  407   a ,  407   b . As further illustrated, the cooling plane  411  faces the draw plane  211 . In one example, the cooling plane  411  can be positioned at an angle to the draw plane  211  to allow a change in heat transfer along a height of the cooling coils  403   a - e . Alternatively, as shown, the cooling plane  411  can be substantially parallel to the draw plane  211 . Providing a substantially parallel relative orientation can help evenly draw heat from the glass ribbon to facilitate maintenance of a desired temperature profile over the height of the cooling zone along the draw direction  207 . 
     Referring to  FIG. 5 , the plurality of cooling coils  403   a - e  can be aligned relative to one another in a row of cooling coils  403   a - e  extending along the cooling axis  405   a . Although a single row is shown, further examples may include cooling coils arranged in an array of cooling coils having multiple rows. In such examples, the cooling coils may also be aligned along respective columns to form a matrix of cooling coils. 
     As further illustrated, the plurality of cooling coils  403   a - e  can each include a corresponding transverse width “W 1 ”, “W 2 ” and “W 3 ” extending along the cooling axis of the apparatus. As shown, the transverse width of at least one of the plurality of cooling coils is greater than the transverse width of another of the plurality of cooling coils. For example, the center of the glass ribbon may be associated with one or more cooling coils that have a smaller transverse width than the outer cooling coils. For instance, by way of illustration, the row of cooling coils  403   a - e  can include the illustrated inner cooling coil  403   c  with a transverse width “W 3 ” that is less than the transverse width “W 2 ” of an inner pair of cooling coils  403   b ,  403   d  straddling the inner cooling coil  403   c . Likewise, the row of cooling coils  403   a - e  can include an outer pair of cooling coils  403   a ,  403   e  with a width “W 1 ” that can be greater than the width “W 2 ” of the inner pair of cooling coils  403   b ,  403   d  and the width “W 3 ” inner cooling coil  403   c.    
     In further examples, one or more of the cooling coils may include the same width. For example as shown, the inner pair of cooling coils  403   b ,  403   d  have the same transverse width “W 2 ” and the outer pair of cooling coils  403   a ,  403   e  has the same transverse width “W 1 ”. Providing cooling coils with different and/or the same width can help compensate cooling and/or heating of the glass ribbon  103  at different distances from the center of the glass ribbon. Moreover, the cooling coils may have a different width to correspond to the transverse width of a plurality of heating devices described more fully below. 
     As shown in  FIG. 6 , each transverse width “W 1 ”, “W 2 ” and “W 3 ” of the plurality of cooling coils  403   a - e  is substantially less than a draw width “W d ” of the fusion draw apparatus  101 . As shown in  FIG. 6 , the fusion draw width “W d ” can be considered a transverse width of the glass ribbon  103  along a direction perpendicular to the draw direction  207  between the edges  103   a ,  103   b . Providing each cooling coil  403   a - e  with transverse widths “W 1 ”, “W 2 ” and “W 3 ” that are substantially less than the draw width “W d ” of the fusion draw apparatus  101  can allow selective cooling within cooling zones  601   a - e  to help achieve the desired temperature profile along the cooling axis  405   a.    
     The row of cooling coils  403   a - e  can also be aligned relative to one another in a row of cooling coils  403   a - e  along the cooling axis  405   a  such that an overall length “L” of the cooling coils is greater than or about equal to the draw width “W d ” of the fusion draw apparatus  101 . While smaller lengths are possible, providing the length “L” greater than or about equal to the draw width “W d ” can allow transverse temperature profile control across the entire width of the glass ribbon  103 . 
     As shown in  FIG. 6 , each of the cooling coils  403   a - e  can be independently operable from the other cooling coils. For example, each of the plurality of cooling coils  403   a - e  can include a respective inlet  603   a - e  configured to receive a cooling fluid such as a gas and/or liquid. For example, as shown, each respective inlet  603   a - e  can be provided with a cooling liquid  607 , such as water, from a source  609  of cooling liquid  607 . Each of the cooling coils  403   a - e  can also include a respective outlet  605   a - e  configured to pass heated liquid from the cooling coil to a containment structure  611 , although a closed liquid circuit arrangement may be provided in further examples. In such examples, a heat exchanger can be used to remove heat from the heated fluid before reintroducing the cooled fluid back into the respective inlet  603   a - e.    
     In one example, a pump  613  may be provided to pump liquid to the respective inlets  603   a - e  to be circulated through the cooling coils  403   a - e . In one example, a manifold  615  may be provided with a plurality of solenoid flow valves  617  that may be manually or automatically operated to adjust the flow rate of fluid through the respective cooling coil  403   a - e . In one example, a computer controller  619  may be provided to send signals along a respective line  621  to the respective solenoid flow valve  617 . In further examples, a predetermined flow for each respective cooling coil  403   a - e  may be programmed into the computer or calculated by the computer by further inputs. In one example, a flow sensor  623  can monitor the fluid flow within each cooling coil  403   a - e  and provide a signal by way of a respective communication line  625  to the computer controller  619 . As such, the actual fluid flow through each respective cooling coil  403   a - e  can be monitored by the respective flow sensor  623 . The fluid flow signal can then be provided to the computer controller  619  that can then output a command signal to operate the pump  613  and adjust the respective solenoid flow valve  617  to provide the appropriate flow rate through the corresponding cooling coil  403   a - e . Although not shown, each fluid circuit may include a pressure relief valve although not required in further examples. 
     As further shown in  FIG. 6 , each of the inlets  603   a - e  may be provided with a corresponding inlet temperature sensor T 1  and each of the outlets  605   a - e  may be provided with a corresponding outlet temperature sensor T 2 . As such, the inlet and outlet temperatures of the fluid entering and exiting each of the cooling coils  403   a - e  may be monitored. The computer controller  619  can be programmed to calculate the change in temperature (i.e., ΔT) measured by the temperature sensors T 1 , T 2 . Moreover, the computer controller  619  can be programmed with the specific heat of the fluid being circulated through the cooling coils  403   a - e . Together with the flow rate of the fluid measured by the flow sensors  623 , the computer controller  619  may approximate the heat being removed by each cooling coil  403   a - e . This information may be further used to help optimize the temperature control within the cooling zones  601   a - e.    
     In further examples, the apparatus can include a plurality of heat sensors  627  associated with each of the cooling zones  601   a - e . The heat sensors  627  can be configured to monitor the temperature of the glass ribbon at different positions along the transverse profile. In one example, each heat sensor  627  can include a communication line  629  configured to allow a signal corresponding to the sensed temperature to be transmitted back to the computer controller  619 . As such, a temperature of the portion of the glass ribbon  103  associated with each cooling zone  601   a - e  may monitored. Based on the sensed temperature, the flow of fluid through each cooling coil  403   a - e  may be independently operated from the other cooling coils to achieve a desired transverse temperature profile of the glass ribbon  103  along the cooling axis  405   a . As such, the illustrated configuration provides a control system configured to selectively operate the cooling coils based on corresponding temperatures sensed at different positions along the transverse profile. 
     As shown in  FIGS. 4-7 , the fusion draw apparatus  101  may also optionally include a plurality of heating devices  413   a - e  positioned along the cooling axis  405   a . Various heating devices may be used in accordance with aspects of the disclosure. For example, as shown in  FIG. 4 , the heating devices  413   a - e  can include rows of heating elements  415  that may be electrically arranged in parallel or series with respect to one another. Each row of heating elements  415  can be designed to achieve different temperatures to allow production of a temperature gradient in the draw direction  207 . In further examples, each row of heating elements  415  can be designed to achieve substantially the same temperature to expose a portion of the ribbon to substantially the same heated temperature as the portion of the glass passes by the heating devices  413   a - e.    
     As also shown in  FIG. 4 , the heating elements  415  can each extend along a heating plane  417 . In one example, the heating plane  417  is positioned at an angle to the draw plane  211  and/or the cooling plane  411  to allow a change in heat transfer as a portion of the glass ribbon  103  passes by the heating plane  417 . Alternatively, as shown, the heating plane  417  can be substantially parallel to the cooling plane  411  and the draw plane  211  although the heating plane  417  may only be substantially parallel with the cooling plane  411  or the draw plane  211  in further examples. Providing a substantially parallel relative orientation can help evenly apply heat to the glass ribbon to facilitate maintenance of a desired temperature profile over the height of the cooling zone (or heat zone) along the draw direction  207 . 
     Referring to  FIG. 5 , the plurality of heating devices  413   a - e  can be aligned relative to one another in a row of heating devices  413   a - e  also extending along the cooling axis  405   a  together with the row of cooling coils  403   a - e . Although a single row is shown, further examples may include heating devices arranged in an array of heating devices having multiple rows. In such examples, the heating devices may also be aligned along respective columns to form a matrix of cooling coils. 
     As further illustrated, the plurality of heating devices  413   a - e  can also include a corresponding transverse width that may be about equal to a corresponding one of the cooling coils  403   a - e . As such, as shown in  FIG. 5 , each of the heating devices can include a transverse width that is substantially equal to the transverse width “W 1 ”, “W 2 ” and “W 3 ” of the corresponding cooling coil. As described with the cooling coils above, the heating devices may likewise have the same or different widths. Providing heating devices with the same and/or different widths can help compensate for faster cooling that typically occurs towards the edges  103   a ,  103   b  of the glass ribbon  103 . 
     As shown in  FIG. 6 , each transverse width “W 1 ”, “W 2 ” and “W 3 ” also corresponding to the widths of the heating devices  413   a - e  is likewise substantially less than a draw width “W d ” of the fusion draw apparatus  101 . Providing each of the heating devices  413   a - e  with a corresponding transverse width “W 1 ”, “W 2 ” and “W 3 ” that is substantially less than the draw width “W d ” of the fusion draw apparatus  101  can allow selective heating within cooling zones  601   a - e  to help achieve the desired temperature profile along the cooling axis  405   a . The row of heating devices  413   a - e  can also be aligned relative to one another in a row of heating devices  413   a - e  along the cooling axis  405   a  such that a length “L” is greater than or about equal to the draw width “W d ” of the fusion draw apparatus  101 . While smaller lengths are possible, providing the length “L” greater than or about equal to the draw width “W d ” can allow transverse temperature profile control across the entire width of the glass ribbon  103 . 
     As shown in  FIG. 6 , each of the heating devices  413   a - e  can be independently operable from the other heating devices. For example, each of the plurality of heating devices  413   a - e  can include electrical contacts  631   a ,  631   b  configured to be placed in an electrical circuit to allow heating of the windings of the heating device when running electrical current through the windings. In one example, an electrical relay  633  is configured to receive signals from the computer controller  619  to individually control the current flowing through the electrical contacts  631   a ,  631   b  depending on the desired heat output determined desirable at each cooling zone  601   a - e . In further examples, a predetermined electrical current for each one of the respective heating devices  413   a - e  may be programmed into the computer controller or calculated by the computer controller by further inputs. 
     In still further examples, electrical current flow through each of the heating devices  413   a - e  can be independently operated based on the sensed temperature from the plurality of optional heat sensors  627 . As such, the illustrated apparatus provides a control system configured to selectively operate the heating devices based on corresponding temperatures sensed at different positions along the transverse profile. 
     In further examples, one or more of the cooling coils  403   a - e  may be associated with each of the heating devices  413   a - e . Alternatively, one or more of the heating devices  413   a - e  may be associated with each of the cooling coils  403   a - e . As shown in  FIGS. 5-6 , each of the plurality of heating devices  413   a - e  may be associated with a corresponding one of the cooling coils  403   a - e . In some examples, the heating devices  413   a - e  may be operated at the same time as the cooling coils  403   a - e . As such, fine tune adjustment of cooling within each respective cooling zone  601   a - e  may be provided by operating the heating device together with the respective cooling device. Alternatively, the cooling coils  403   a - e  may be turned off wherein cooling is carried out by only operating the heating devices that control the temperature profile. In such examples, the at least one tube of the cooling coil may comprise a wide range of materials capable of withstanding high temperatures when only operating the heating devices. For example, the at least one tube can comprise a high nickel alloy, 310 stainless steel or other high temperature materials. 
     Still further, it is contemplated that the cooling coils may optionally be provided with a coating to obtain a desired emissivity of the material to thereby impact radiation heat loss from the glass ribbon. In addition or alternatively, the same or a different coating may also be provided to inhibit corrosion. As such, one or more coatings may be applied to the cooling coils to enhance emissivity characteristics and/or enhance corrosion resistance. 
     As shown schematically in  FIGS. 4 and 7 , the fusion draw apparatus  101  can include a plurality of temperature control modules  419   a - e  positioned along the cooling axis  405   a  of the fusion draw apparatus  101 , wherein each of the control modules  419   a - e  includes at least one of the plurality of cooling coils  403   a - e  and at least one of the plurality of heating devices  413   a - e . As shown in  FIG. 4 , each temperature control module  419   a - e  can be mounted with respect to the draw device, such as the illustrated forming wedge  201 , such that the corresponding cooling coil  403   a - e  is positioned between the corresponding heating device  413   a - e  and the draw plane  211  of the fusion draw apparatus  101 . 
     Still further, as shown in  FIGS. 4 and 7 , each temperature control module  419   a - e  may be removably mounted with respect to the draw device although nonremovable mounting configurations may be used in further examples. For example, as schematically shown in  FIG. 4 , a mounting bracket  421  can be removably mounted by way of fasteners  423  to a support structure  425  of the fusion draw apparatus  101 . Another set of fasteners  427  can attach the heating devices  413   a - e  to the mounting bracket  421 . Yet another set of fasteners  429  can attach the cooling coils  403   a - e  to the mounting bracket  421 . As shown, the tube  501  can include a mounting segment  431  that may be received within a mounting groove  433  formed in an insulating brick  435  associated with the corresponding heating device  413   a - e . As shown, the mounting groove  433  can receive a corresponding mounting segment  431  of the tube  501  to help provide a secure mounting of the compact shape  503  of the cooling coil  403   a - e  in a cantilever fashion with respect to the insulating brick  435 . Although not shown, further optional mounting structures may be provided in accordance with further aspects of the disclosure. 
     As shown, the mounting bracket  421  provides for removable mounting of the temperature control module  419   a - e  with respect to the draw device. For example, as shown in  FIG. 7 , a selected one of the temperature control modules  419   a - e  may be removed by unfastening mounting fasteners  423  corresponding to the selected control module. As shown by the arrow  701 , the old control module  703  may be quickly removed and replaced by a new control module  705 . As such, a selected control module may be quickly replaced without the need to replace the other control modules. Furthermore, it is possible to replace a damaged heating device and/or cooling coil associated with the old control module  703  while drawing molten glass in the draw direction and without shutting down the fusion draw process. The old control module can then be refurbished to provide for another replacement module in the future. 
     As discussed previously, the cooling coil and/or heating device may be provided at various locations. As shown in  FIG. 4 , another temperature control module  437   a - e  may be provided along the cooling axis  405   b  located in the lower portion of the setting zone  309 . The temperature control modules  437   a - e  may be substantially identical to the control modules  419   a - e  described above. Alternatively, as shown, the temperature control modules  437   a - e  may be a different size than the control modules  419   a - e . In still further examples, only a cooling device or heating device may be provided along the cooling axis  405   b  in further examples. 
     In operation, methods of producing a glass ribbon  103  can include the steps of drawing molten glass in the draw direction  207  into the viscous zone  307  to form the glass ribbon  103  including the opposed edges  103   a ,  103   b  extending in the draw direction  207 . As shown in  FIGS. 1 and 3 , the opposed edges  103   a ,  103   b  are spaced apart along the width of the glass ribbon  103  that is transverse to the draw direction  207 . 
     The method then includes the step of drawing the molten glass from the viscous zone  307  to the setting zone  309  downstream from the viscous zone  307 . In the setting zone  309 , the glass ribbon  103  is set from a viscous state to an elastic state. The method further includes the step of drawing the glass ribbon  103  into the elastic zone  311  downstream from the setting zone  309 . Optionally, the cutting device  303  may then be used to cut distinct glass sheets  305  from the glass ribbon  103  for further processing. Although not shown, the edges of the glass ribbon may be trimmed and/or the glass ribbon may be coiled into a storage spool for carrying out further cutting techniques at another location. 
     The method further includes the step of controlling a transverse temperature profile of the glass ribbon  103  along the width of the glass ribbon  103  in at least one of the viscous zone  307 , the setting zone  309  and the elastic zone  311 . The step of controlling the temperature profile includes selectively removing heat from at least one of a plurality of cooling coils  403   a - e  positioned along the cooling axis  405   a  that is transverse to the draw direction  207 . 
     As shown in  FIG. 6 , the step of removing heat from the cooling coils can be carried out by circulating fluid, such as water, through the at least one tube  501  that forms the corresponding cooling coil. Circulating fluid through a tube can avoid damaging or otherwise contaminating electrical components associated with the heating device or other parts of the fusion draw apparatus  101  with fluid such as water. 
     As further shown in  FIG. 6 , the method can selectively operate the cooling coils  403   a - e  to control the transverse temperature profile of the glass ribbon  103 . For example, the heat sensors  627  can sense the temperature of the glass ribbon  103  at different positions along the width of the glass ribbon. The heat sensors  627  can then send feedback to the computer controller  619  by way of communication lines  629 . Based on the feedback, the computer controller can adjust the pump  613  and or one or more of the solenoid flow valves  617  to independently adjust the cooling flow of fluid through one or more of the cooling coils  403   a - e . As such, methods are possible to adjust the cooling rate of at least one of the cooling coils  403   a - e  without adjusting the cooling rate of at least another one of the cooling coils. Moreover, the plurality of cooling coils  403   a - e  may be selectively operated based on temperature feedback to provide a control system that operates the cooling coils based on the sensed temperatures. 
     In further examples, the temperature profile can be controlled by selectively adding heat with at least one of the plurality of heat devices  413   a - e  positioned along the cooling axis  405   a . In one example, the computer controller  619  can automatically adjust the heat added by each of the heating devices based on feedback sensed by the heat sensors  627 . Example methods can involve cooling with the heating devices  413   a - e  without the use of the cooling coils  403   a - e . For example, the fluid may be drained out of the cooling coils, wherein the high-temperature metal of the at least one tube of the cooling devices allows the cooling coils to maintain structural integrity within the high temperature environment while providing little, if any, interference of heating the portions of the glass ribbon with the respective heating devices. In operation, the outer portions of the glass ribbon  103  near the edges  103   a ,  103   b  naturally tend to cool faster than the central portion of the glass ribbon  103 . As such, the temperature sensed by the outer sensors  627  associated with cooling zones  601   a ,  601   e  may determine that the outer portions of the glass ribbon  103  are cooling too quickly. In response, the computer controller  619  may activate the outer pair of heating devices  413   a ,  413   e  at a higher temperature relative to the remaining heating devices to provide a more even cooling of the glass ribbon across the width. 
     Alternatively, the heating devices may be turned off, wherein cooling is conducted with the cooling coils  403   a - e . In this example, temperature sensed by the heat sensor  627  associated with the central cooling zone  601   c  may indicate that the central portion of the glass ribbon includes a relatively high temperature. In response, the computer controller  619  may increase the flow rate of fluid through the inner cooling coil  403   c  to increase the cooling rate of the central cooling zone  601   c . As such, the central cooling coil may cool at a relatively higher rate to provide a more even cooling of the glass ribbon across the width. 
     In still further examples, the heating devices and cooling coils may be operated at the same time. For instance, heating applied by the heating device can be modified by cooling with a respective cooling coil to provide fine tuning of the effective cooling rate applied by the respective cooling zone. 
     As further illustrated, the relatively different transverse widths “W 1 ”, “W 2 ” and “W 3 ” may be provided to help facilitate larger heat transfer in areas where cooling rate adjustment is needed the most. For example, the outer heating devices  413   a ,  413   e  may be associated with relatively larger widths “W 1 ” to help apply heat at a greater rate to the outer edges to compensate for faster cooling at the edges that would otherwise provide an undesirable transverse temperature profile. 
     It will be apparent to those skilled in the art that various modifications and variations can be made to the present disclosure without departing from the spirit and scope of the invention. Thus, it is intended that the present invention cover the modifications and variations of this disclosure provided they come within the scope of the appended claims and their equivalents.