Glass plate forming method and glass forming line used in same

Abstract

The invention relates to a glass plate forming method and a glass forming production line used in the forming method. A glass sheet forming method includes providing a glass sheet. In addition, a bending workstation is also provided. The bending station includes a first bending tool. The first bending tool has a forming surface for receiving a glass sheet. The glass sheet is conveyed on the plurality of rollers to a position above the first bending tool. At least a portion of the glass sheet is supported above the first bending tool by delivering a fluid flow to a major surface of the glass sheet. The glass sheet is arranged on the forming surface of the first bending tool.

Description

[0001] This application is a divisional of Chinese Patent Application No. 201780079995.7, filed on November 13, 2017, entitled "Glass Sheet Forming Method and Glass Forming Line for Use in the Forming Method," which is a national phase application of International Application No. PCT / GB2017 / 053414, having an international filing date of November 13, 2017, and claims priority to U.S. Provisional Patent Application No. 62 / 421,041, filed on November 11, 2016, the entire disclosure of which is hereby incorporated by reference herein.

[0002] Cross Reference to Related Applications

[0003] This application claims the benefit under 35 U.S.C. 119(e) of U.S. Provisional Patent Application No. 62 / 421,041, filed on November 11, 2016, and assigned Serial No. 62 / 421,041, the entire disclosure of which is hereby incorporated by reference herein. TECHNICAL FIELD

[0004] The present invention relates to the forming of glass sheets. More particularly, the present invention relates to a glass sheet forming method and a glass forming line that improves forming and at least partially eliminates defects on the glass sheet. BACKGROUND

[0005] Various processes are known for forming or bending glass sheets. In certain bending processes, a heated glass sheet is supported on an annular member and allowed to sag under the action of gravity, with or without the action of additional pressing forces. Another known glass sheet bending process is a press bending process in which a glass sheet (or nested pair) is bent between a pair of complementary forming members, which are typically in vertically spaced apart relationship.

[0006] Prior to bending, the glass sheet can be heated to a bending temperature in an associated furnace and moved using a series of rollers. A vertically movable stopper can facilitate positioning of the heated glass sheet in a direction of travel prior to bending. However, the heated glass sheet is only positioned in another direction (e.g., substantially perpendicular to the glass travel direction) on the rollers prior to entry of the glass sheet into the furnace. Thus, the alignment of the glass sheet prior to the bending process can be less than ideal, which can result in the glass sheet not having the desired properties or suboptimal product quality. In addition, the contact between the rollers and the glass sheet immediately prior to the glass sheet being transferred to the bending tool can result in marks on the glass sheet that cause optical distortion. SUMMARY

[0007] Accordingly, it would be advantageous to develop a glass sheet forming method and a glass forming line that overcomes the above-described problems.

[0008] Accordingly, from a first aspect, the present application provides a method of forming a glass sheet, the method comprising: providing a glass sheet; providing a bending station comprising a first bending tool, the first bending tool having a forming surface for receiving the glass sheet; transporting the glass sheet over a plurality of rollers to a position above the first bending tool; supporting at least a portion of the glass sheet above the first bending tool by transporting a flow of fluid to a major surface of the glass sheet; and disposing the glass sheet on the forming surface of the first bending tool.

[0009] Preferably, the method further comprises moving the plurality of rollers in a direction towards the first bending tool prior to disposing the glass sheet on the first bending tool.

[0010] Preferably, the method further comprises supporting the glass sheet on the forming surface of the first bending tool.

[0011] Preferably, the method further comprises transporting the glass sheet on the plurality of rollers at a height, and wherein the flow of fluid to the major surface of the glass sheet raises the glass sheet above the height.

[0012] Preferably, the method further comprises adjusting a position of the glass sheet relative to the forming surface of the first bending tool after disposing the glass sheet on the forming surface of the first bending tool.

[0013] Preferably, the method further comprises heating the glass sheet in a pre-heat furnace and transferring the glass sheet to the plurality of rollers.

[0014] Preferably, the method further comprises moving the first bending tool in a direction towards the plurality of rollers prior to disposing the glass sheet on the first bending tool.

[0015] Preferably, the flow of fluid to the major surface of the glass sheet is terminated prior to or after the glass sheet is disposed on the forming surface of the first bending tool.

[0016] Preferably, the flow of fluid is heated.

[0017] Preferably, the flow of fluid comprises air.

[0018] In some embodiments, the method further comprises adjusting a position of the glass sheet relative to the forming surface of the first bending tool prior to disposing the glass sheet on the forming surface of the first bending tool.

[0019] Preferably, the flow of fluid to the major surface of the glass sheet is terminated after adjusting the position of the glass sheet.

[0020] Preferably, the flow of fluid to the major surface of the glass sheet is terminated after adjusting the position of the glass sheet and prior to or after the glass sheet is disposed on the forming surface of the first bending tool.

[0021] In some embodiments, the method further includes discharging a fluid flow from the fluid pad assembly.

[0022] Preferably, the fluid pad assembly includes one or more fluid pads.

[0023] When the fluid pad assembly includes one or more fluid pads, preferably, the one or more fluid pads are spaced apart from each other.

[0024] When the fluid pad assembly includes one or more fluid pads, preferably, the fluid flow is received by the fluid pad assembly at a first pressure and is at a second pressure within the one or more fluid pads, wherein the first pressure of the fluid flow is greater than the second pressure of the fluid flow.

[0025] Preferably, the method further includes heating the fluid flow before it is discharged from the fluid pad assembly.

[0026] The present invention also provides a glass forming production line in a second aspect, comprising: a bending workstation including a first bending tool having a forming surface for receiving a glass sheet; a plurality of rollers for conveying the glass sheet to a position above the first bending tool; and a fluid pad assembly including one or more fluid pads, each fluid pad configured to convey a fluid flow to a main surface of the glass sheet for supporting at least a portion of the glass sheet above the first bending tool.

[0027] Preferably, the glass forming production line further includes a centering device comprising a first locator disposed around the outer peripheral edge of the first bending tool, the first locator being configured to position the glass sheet relative to the forming surface of the first bending tool before the glass sheet is placed on the forming surface of the first bending tool.

[0028] In some embodiments, the glass forming production line further includes one or more controllers that communicate with one or more valves to provide signals to the valves to regulate the flow of fluid from one or more fluid sources to the fluid pad assembly.

[0029] Preferably, the glass forming production line further includes a centering device for adjusting the position of the glass sheet, wherein one or more controllers communicate with the centering device to provide signals to the centering device to adjust the positioning of the glass sheet, wherein when the centering device adjusts the positioning of the glass sheet, at least a portion of the glass sheet is supported above the first bending tool by a fluid flow.

[0030] In some embodiments, at least one of the one or more fluid pads includes a fluid inlet for receiving a fluid flow from a fluid source and a fluid outlet for discharging a fluid flow from the fluid pad, wherein a chamber is provided between the fluid inlet and the fluid outlet.

[0031] Preferably, the at least one fluid pad further comprises a heating element positioned within the chamber, more preferably wherein the heating element is further positioned between the diffuser plate and the fluid outlet.

[0032] Preferably, the fluid outlet comprises one or more openings formed in the cover member.

[0033] Preferably, the glass forming line further comprises a diffuser plate positioned in spaced apart relation from the fluid inlet, the diffuser plate receiving the fluid flow from the fluid inlet and distributing the fluid flow laterally within the fluid pad.

[0034] Embodiments of a glass sheet forming method are provided. In one embodiment, the method includes providing a glass sheet. Further, a bending station is provided. The bending station includes a first bending tool. The first bending tool has a forming surface for receiving the glass sheet. The glass sheet is conveyed over a plurality of rollers to a position above the first bending tool. At least a portion of the glass sheet is supported above the first bending tool by delivering a fluid flow to a major surface of the glass sheet. The glass sheet is disposed on the forming surface of the first bending tool.

[0035] Further, embodiments of a glass forming line are provided. In one embodiment, the glass forming line includes a bending station including a first bending tool. The first bending tool has a forming surface for receiving a glass sheet. Further, the glass forming line includes a plurality of rollers for conveying the glass sheet to a position above the first bending tool and a fluid pad assembly including one or more fluid pads. Each fluid pad is configured to deliver a fluid flow to a major surface of the glass sheet for supporting at least a portion of the glass sheet above the first bending tool. BRIEF DESCRIPTION OF DRAWINGS

[0036] The above and other advantages of the present application will become readily apparent to those skilled in the art from the following detailed description, wherein:

[0037] Figure 1 is a schematic view of an embodiment of a glass forming line according to the present application;

[0038] Figure 2 is a top view of a portion of the glass forming line of Figure 1

[0039] Figure 3 is a perspective view of an embodiment of a portion of a bending station of the glass forming line of Figure 1

[0040] Figure 4 is a top view of a portion of the bending station of Figure 3 with the plurality of rollers removed.​​

[0041] Figure 5 is a side view of a bending station that is part of Figure 4

[0042] Figure 6 is a top view of an embodiment of a fluid cushion suitable for use in the bending station of Figure 3

[0043] Figure 7 is a cross-sectional view of the fluid cushion of Figure 6 taken along line 7-7;

[0044] Figure 8 is another cross-sectional view of the fluid cushion of Figure 6 taken along line 8-8;

[0045] Figure 9 is a perspective view of another embodiment of a fluid cushion suitable for use in the glass forming production line of Figure 1

[0046] Figure 10 is a top view of the fluid cushion of Figure 9

[0047] Figure 11 is a cross-sectional view of the fluid cushion of Figure 10 taken along line 11-11;

[0048] Figure 12 is another cross-sectional view of the fluid cushion of Figure 10 taken along line 12-12;

[0049] Figure 13 is a perspective view of yet another embodiment of a fluid cushion suitable for use in the glass forming production line of Figure 1

[0050] Figure 14 is a top view of the fluid cushion of Figure 13

[0051] Figure 15 is a cross-sectional view of the fluid cushion of Figure 14 taken along line 15-15; and

[0052] Figure 16 is another cross-sectional view of the fluid cushion of Figure 14 taken along line 16-16.DETAILED DESCRIPTION

[0053] ​​​​​​It should be understood that the application can be practiced with various alternatives and modifications to the embodiments described and illustrated. It is also to be understood that the following description is not limited to the embodiments that are merely examples of implementing the present inventive concepts. Therefore, specific dimensions, directions or other physical characteristics relating to the embodiments disclosed are not to be considered as limiting, unless expressly stated otherwise. Moreover, although they can not be identical, identical elements found in the above-described embodiments can be referred to with the same designator in this section of the application.

[0054] Herein and with reference to Figure 1 -16 describes an embodiment of a glass sheet forming method and a glass forming production line used therein.

[0055] The glass sheet can be used as part of a window, such as a windshield for an automobile. However, the glass sheet can have other automotive applications. For example, the glass sheet can be used to form a side window, sunroof, or rear window. Such windows can be monolithic or laminated. Additionally, the glass sheet can have other vehicular applications. For example, the glass sheet can be applied to on-highway and off-highway vehicles. Also, the glass sheet can have architectural, electronic, industrial, locomotive, marine, aerospace, and other applications.

[0056] In certain embodiments, the glass sheet can have a soda-lime-silicate composition. A typical soda-lime-silicate glass composition (by weight), Si02is 69-74%; AI2O3is 0-3%; Na20 is 10-16%; K2O is 0-5%; MgO is 0-6%; CaO is 5-14%; SO3is 0-2%; and Fe203is 0.005-2%. The glass composition can also contain other additives, such as fining aids, which are typically present in amounts up to 2%. In other embodiments, the glass sheet can be another composition. For example, the glass sheet can be a borosilicate composition or an aluminosilicate composition. The glass sheet can have a thickness between 0.5 millimeter - 25 millimeters (mm), typically a thickness between 0.5 mm - 8 mm.

[0057] The shape of the glass sheet of the various embodiments can vary. However, in certain embodiments, the glass sheet can have a rectangular profile in plan view. Preferably, the glass sheet has a first major surface and a second major surface. The second major surface is opposite the first major surface.

[0058] Figure 1 An embodiment of a glass forming production line 100 is shown. In certain embodiments, the glass forming production line 100 has a press-bend variant. In other embodiments (not shown), the glass forming production line has a gravity-bend variant.

[0059] Preferably, the glass forming production line 100 includes a preheating furnace 104. The preheating furnace 104 is used to heat the glass sheet 106 prior to bending of the glass sheet 106. In the preheating furnace 104, the glass sheet 106 is heated to a temperature suitable for forming. For example, the glass sheet 106 can be heated to a temperature of 590 °C - 670 °C. Thus, the glass sheet 106 can also be referred to as a heated glass sheet.

[0060] The glass sheet 106 is conveyed through the furnace 104 on rollers 108. The rollers 108 are spaced apart. Near the exit of the preheating furnace 104, the spacing of the rollers 108 is reduced because the glass sheet 106 in the heated state is deformable and thus requires more support.

[0061] The preheating furnace 104 is followed by a bending station 110. The bending station 110 includes a first bending tool 112 and, in certain embodiments, a second bending tool 114. It can be appreciated that the bending tools 112, 114 included in the bending station 110 can be more than the bending tools shown in Figure 1 Moreover, the bending tools 112, 114 shown in Figure 1 may be positioned in locations other than those shown in Figure 1 .

[0062] The first bending tool 112 and the second bending tool 114 can be conventional bending tools in the art. In one embodiment, the first bending tool 112 is a ring die and the second bending tool 114 is a full-face die. Suitable embodiments of the first bending tool 112 and the second bending tool 114 are also described in International Publication No. WO 2016 / 189319 Al, the entire disclosure of which is hereby incorporated by reference.

[0063] As shown in Figure 1 , the first bending tool 112 can be a female tool. As best shown in Figure 2 , in one embodiment, the first bending tool 112 has a forming surface 116 for receiving the glass sheet 106, particularly a concave forming surface. More particularly, the first bending tool 112 has an upper forming surface 116 for receiving the glass sheet 106 thereon. After the glass sheet 106 is received on the forming surface 116, the glass sheet 106 is supported thereon. The first bending tool 112 can also support a stack of glass sheets thereon, particularly nested pairs separated by a suitable release agent such as calcium carbonate.

[0064] As shown in Figure 2As best shown, the first bending tool 112 may have a generally rectangular profile or periphery configured to support a glass plate 106 that also has a rectangular profile. In this embodiment, the first bending tool 112 has a first segment 118 and a second segment 120. A third segment 122 is positioned at one end of the first segment 118 and the second segment 120. A fourth segment 124 is positioned at the other end of the first segment 118 and the second segment 120. When configured, segments 118-124 define a generally rectangular profile. However, the first bending tool may have other configurations. For example, in one embodiment, the first segment may not be configured to be parallel to the second segment. In other embodiments, the third segment may not be configured to be parallel to the fourth segment. In other embodiments, the profile of the first bending tool may be trapezoidal or have other forms suitably configured to support a particular glass plate to be formed. Moreover, as Figure 2 As shown, one or more of segments 118-124 may include one or more curved edges.

[0065] Furthermore, in some embodiments, the bending workstation 110 includes a centering device 102. The centering device 102 can be used to adjust the positioning of the glass plate 106 before it is placed on the first bending tool 112. Figure 2 As shown, the centering device 102 may include a plurality of positioners 126, 128. Positioners 126, 128 may be arranged around the outer peripheral edge of the first bending tool 112 to position the glass plate 106 relative to the first bending tool 112 before the glass plate 106 has been formed.

[0066] like Figure 2As best shown, a first positioner 126, which can move vertically in both upward and downward directions, is configured to adjust the position of the glass plate 106 relative to the forming surface 116 before the glass plate 106 is positioned on the forming surface 116. In other embodiments, the first positioner 126 is configured to adjust the position of the glass plate 106 relative to the forming surface 116 after the glass plate 106 is positioned on the forming surface 116. In one embodiment, the first positioner 126 may include one or more portions 130, 130A that contact the leading edge of the glass plate 106 when positioning the glass plate. In another embodiment, the first positioner 126 may include separate portions 132, 132A that contact opposite sides of the glass plate 106. In these embodiments, the first positioner 126 may also function as a stop that prevents the glass plate 106 from moving beyond the first bending tool 112. After positioning the glass plate 106, portions 130, 130A, 132, 132A of the first positioner 126 that contact the glass plate 106 can be moved vertically downwards or retracted so as not to interfere with one or more of the bending tools 112, 114 during bending of the glass plate 106. The centering device 102 may also include a second positioner 128. In one embodiment, the second positioner 128 is configured to adjust the position of the glass plate 106 relative to the forming surface 116 before the glass plate 106 is placed on the forming surface 116. In another embodiment, the second positioner 128 is configured to adjust the position of the glass plate 106 relative to the forming surface 116 after the glass plate 106 is placed on the forming surface 116. In these embodiments, the second positioner 128 may include one or more portions 134, 134A that contact the trailing edge of the glass plate 106 when the glass plate is positioned. The portions 134, 134A of the second positioner 128 that contact the trailing edge of the glass plate 106 can each be attached to the pivot arms 136, 136A. After the glass plate 106 is fully within the bending workstation 110, the pivot arms 136, 136A can be rotated to bring the second positioner 128 into contact with the glass plate 106. After positioning the glass plate 106, the portions 134, 134A of the second positioner 128 that contact the glass plate 106 can be rotated away from the glass plate 106 so as not to interfere with one or more of the bending tools 112, 114 during bending of the glass plate 106.

[0067] Refer again Figure 1A plurality of rollers 138 are provided for conveying the glass plate 106 to a position above the first bending tool 112. Preferably, each of the plurality of rollers 138 rotates to convey the glass plate 106 along the glass travel direction. Moreover, it is preferred that when the first bending tool 112 is in a non-operating position, the plurality of rollers 138 convey the glass plate 106 to a height or distance above the first bending tool 112. It is also preferred that the height at which the plurality of rollers 138 convey the glass plate 106 is substantially constant.

[0068] Once the glass plate 106 leaves the preheating furnace 104, it is transferred from the rollers 108 in the preheating furnace 104 to the plurality of rollers 138. Figure 2 As shown, in some embodiments, the plurality of rollers 138 may include rollers with different lengths. In other embodiments (not shown), the plurality of rollers may include rollers having substantially equal lengths. Figure 1 As shown in Figure -3, each of the plurality of rollers 138 is spaced apart from its adjacent rollers. The dimensions of the space provided between the rollers can be equal. Preferably, each of the plurality of rollers 138 is movable, because each roller can move vertically in a downward or upward direction.

[0069] The glass forming production line 100 also includes a fluid pad assembly 140. The fluid pad assembly 140 facilitates positioning the glass sheet 106 on the first bending tool 112 and transferring the glass sheet 106 from the plurality of rollers 138 to the first bending tool 112. The fluid pad assembly 140 includes one or more fluid pads 142. Preferably, a plurality of fluid pads 142 are provided. When a plurality of fluid pads 142 are provided, the fluid pads 142 can be configured as an array.

[0070] In some embodiments, the fluid pad assembly 140 can move vertically in a downward or upward direction. In embodiments where the fluid pad assembly 140 can move vertically, the one or more fluid pads 142 can also move vertically in a downward or upward direction. In one such embodiment, the fluid pad assembly 140 is connected to the plurality of rollers 138 such that the fluid pad assembly 140 moves vertically together with the plurality of rollers 138 in a downward or upward direction. In another such embodiment, the movement of the fluid pad assembly 140 and the plurality of rollers 138 is simultaneous. Therefore, in this embodiment, when the plurality of rollers 138 move vertically in a downward or upward direction, the fluid pad assembly 140 moves vertically in a downward or upward direction. In yet another embodiment, when the plurality of rollers 138 move vertically in a downward or upward direction, the fluid pad assembly 140 moves vertically in the same direction as the plurality of rollers 138. In this embodiment, the fluid pad assembly 140 and the plurality of rollers 138 can move simultaneously. For example, when the plurality of rollers 138 move vertically downwards, the fluid pad assembly 140 also moves vertically downwards, which can occur simultaneously with the movement of the plurality of rollers 138. Furthermore, in this embodiment, when the plurality of rollers 138 move vertically upwards, the fluid pad assembly 140 can move vertically upwards simultaneously with the movement of the plurality of rollers 138. In other embodiments, the fluid pad assembly 140 cannot move vertically.

[0071] As described above, the glass plate 106 has a first main surface and a second main surface. The fluid pad assembly 140 delivers a fluid flow to one of the main surfaces of the glass plate 106. In some embodiments, the first main surface of the glass plate 106 faces the fluid pad assembly 140. In these embodiments, the second main surface may face the second bending tool 114. Thus, in these embodiments, the fluid pad assembly 140 delivers a fluid flow to the first main surface of the glass plate 106. Preferably, each fluid pad 142 provided is configured to deliver a fluid flow to the main surface of the glass plate 106. When the first main surface of the glass plate 106 faces a plurality of fluid pads 142, each fluid pad 142 delivers a fluid flow to the first main surface of the glass plate 106.

[0072] Each fluid pad 142 is positioned such that a fluid flow can be delivered and distributed to the main surface of the glass plate 106. The position of a particular fluid pad 142 relative to the glass plate 106 can be selected based on the shape of the glass plate 106. In some embodiments, the fluid pad assembly 140 may include a fluid pad 142 located below at least a portion of the leading edge of the glass plate 106 and another fluid pad 142 located below at least a portion of the glass plate 106 before the glass plate 106 is positioned on the first bending tool 112. This arrangement is particularly preferred when the leading and / or trailing edges of the glass plate include curved portions. Moreover, referring now... Figure 1-3. Preferably, the fluid pad 142 is located in at least one space between adjacent rollers of the plurality of rollers 138. More preferably, the fluid pad 142 is located in each space between adjacent rollers of the plurality of rollers 138. For example... Figure 1 As shown in Figure -4, the fluid pads 142 are spaced apart from each other. In one embodiment, the fluid pads 142 are equidistant from each other, as shown in Figure -4. Figure 1 As shown in -3, the movable roller 138 can be disposed in each space between adjacent fluid pads 142.

[0073] The number of rollers 138 and the number of fluid pads 142 in the provided fluid pad assembly 140 may depend on the size and shape of the glass plate 106. In embodiments where the fluid pad assembly 140 includes a plurality of fluid pads 142, the number of fluid pads 142 provided may be the same as the number of rollers 138 provided. In this embodiment, which is not shown, the number of fluid pads 142 provided is n, and the number of rollers 138 provided is n. In other embodiments, the number of fluid pads 142 provided may be less than the number of rollers 138 provided. In this embodiment, as... Figure 1 As shown, the number of rollers 138 provided is n, and the number of fluid pads 142 provided is less than n. For example, in this embodiment, the number of fluid pads 142 provided may be n-1. However, in some embodiments, it is preferred that the number of fluid pads 142 provided is greater than the number of rollers 138 provided. In these embodiments, the number of rollers 138 provided may be n, and the number of fluid pads 142 provided is greater than n. For example, as... Figure 2 As shown in the embodiment -4, the number of fluid pads 142 provided can be n + 1. In these embodiments, roller 138A is disposed between a pair of fluid pads 142, wherein roller 138A is the roller 138A closest to the leading edge of the glass plate 106 before the glass plate 106 is placed on the first bending tool 112, and another roller 138B is disposed between a pair of fluid pads 142, wherein roller 138B is the roller 138B closest to the trailing edge of the glass plate 106 before the glass plate 106 is placed on the first bending tool 112. Furthermore, in this embodiment, each of the plurality of rollers 138 can be disposed between a pair of fluid pads 142.

[0074] The fluid flow delivered by the fluid pad assembly 140 contacts the glass plate 106 and supports at least a portion of the glass plate 106 above the first bending tool 112. The fluid flow delivered by the fluid pad assembly 140 can support at least a portion of the glass plate 106 for a predetermined period of time. However, when the glass plate 106 is positioned on the first bending tool 112, it should be understood that the glass plate 106 is only temporarily supported by the fluid flow. In these embodiments, it is preferred that the fluid flow be distributed to the glass plate 106 in such a way that more fluid flow is provided near the trailing edge of the glass plate 106, and then fluid flow is provided near the leading edge of the glass plate 106. It is also preferred that the fluid flow be distributed to the glass plate 106 in such a way that the fluid is uniformly distributed across the entire glass plate 106 in a direction perpendicular to the direction of glass travel.

[0075] Preferably, the glass plate 106 is supported at a height above the first bending tool 112, which creates space between the glass plate 106 and each of the plurality of rollers 138. However, in some embodiments, the method may be implemented without providing space between one or more portions of the glass plate 106 and one or more of the plurality of rollers 138. Furthermore, in some embodiments, the flow or fluid supplied to the glass plate 106 causes the glass plate 106 to move vertically in an upward direction or raises the height of the glass plate 106 above the height at which the plurality of rollers 138 transport the glass plate 106. However, it is preferred that the fluid flow does not cause the glass plate 106 to move vertically in an upward direction to a height at which the glass plate 106 contacts the second bending tool 114 or to a height at which the glass plate 106 is positioned on the second bending tool 114. In other embodiments, the flow or fluid supplied to the glass plate 106 supports the glass plate 106 but does not move the glass plate 106 vertically in an upward direction or raise the height of the glass plate 106 above the height at which the plurality of rollers 138 transport the glass plate 106. In other embodiments, the flow or fluid delivered to the glass plate 106 causes the glass plate to move vertically in an upward direction a distance required to form a space between the glass plate 106 and each of the plurality of rollers 138.

[0076] Forming a space between the glass plate 106 and each of the plurality of rollers 138 facilitates positioning the glass plate 106 relative to the first bending tool 112. However, in some embodiments, the glass plate 106 can still be positioned relative to the first bending tool 112 even when no space is provided between one or more portions of the glass plate 106 and one or more of the plurality of rollers 138. When the glass plate 106 is positioned relative to the forming surface 116 of the first bending tool 112 by the centering device 102, it is preferable that the position of the glass plate 106 is positioned or adjusted when at least a portion of the glass plate 106 is supported by a fluid flow. Preferably, the glass plate 106 is supported above the first bending tool 112 and positioned as the plurality of rollers 138 and the fluid pad assembly 140 move vertically downward or retract.

[0077] When the fluid flow is delivered to the glass plate 106, the fluid flow is at a temperature, preferably selected to reduce defects that may occur when the fluid flow is delivered to the glass plate 106. Preferably, the temperature of the fluid flow is selected to be between 18°C ​​and 550°C. More preferably, when the fluid flow is delivered to the glass plate 106, the temperature of the fluid flow is between 350°C and 450°C.

[0078] In embodiments where the fluid flow temperature is selected, the fluid flow can be heated. In these embodiments, the fluid flow can be heated before being received by the fluid pad assembly 140. In other embodiments, the fluid flow can be heated after being received by the fluid pad assembly 140. In these embodiments, one or more heating elements 143 can be disposed within the fluid pad assembly 140 to heat the fluid flow received by the fluid pad assembly 140. In the above embodiments, the fluid flow is heated before being discharged from the fluid pad assembly 140. Alternatively, the temperature of the fluid flow can be selected such that heating is not required. In this embodiment, the fluid flow can be provided at ambient temperature.

[0079] To provide fluid flow to the main surface of the glass plate 106, the fluid pad assembly 140 is in fluid communication with one or more fluid sources 144 (particularly one or more pressurized fluid sources). In one embodiment, the fluid comprises air. In this embodiment, the one or more fluid sources 144 may be pressurized air sources. In other embodiments, the method may be implemented using a fluid comprising other gases or gas mixtures. For example, the fluid may comprise gaseous nitrogen in substantially purified form, vapor, or another compound in a gaseous phase having similar properties. Thus, other fluid sources can be provided.

[0080] Return to reference Figure 2In one embodiment, one or more controllers 145 regulate the fluid flow from the one or more fluid sources 144 to the fluid pad assembly 140. The one or more controllers 145 regulate the fluid flow via one or more valves 147. Each of the one or more valves 147 enables fluid communication between the one or more fluid sources 144 and the fluid pad assembly 140. In one embodiment, the one or more controllers 145 communicate with the one or more valves 147 to provide signals to the one or more valves 147. When fluid flow is required, the one or more controllers 145 can provide signals to the one or more valves 147. When the one or more valves 147 receive a signal from the one or more controllers 145, the one or more valves 147 can be actuated to an open position. In this embodiment, when at least one of the one or more valves 147 is in the open position, fluid flow from the one or more fluid sources 144 is provided to the fluid pad assembly 140.

[0081] After at least a portion of the glass plate 106 has been supported by the fluid flow, the one or more valves 147 may receive another signal from the one or more controllers 145, which pushes the one or more valves 147 to a closed position. In other embodiments, the one or more valves 147 are pushed to the closed position when they do not receive a signal from the one or more controllers 145. In both embodiments, when the one or more valves 147 are in the closed position, the flow to the fluid pad assembly 140 is terminated. When the flow to the fluid pad assembly 140 is terminated, the flow to the main surface of the glass plate 106 is also terminated.

[0082] In some embodiments, the one or more valves 147 are actuated to a closed position after at least a portion of the glass plate 106 has been supported by the fluid flow. Therefore, in these embodiments, the fluid flow to the main surface of the glass plate 106 terminates after at least a portion of the glass plate 106 has been supported by the fluid flow. Furthermore, in these embodiments, the fluid flow to the main surface of the glass plate 106 can be terminated after the position of the glass plate 106 has been adjusted relative to the forming surface of the first bending tool 112. In one embodiment, the fluid flow to the main surface of the glass plate 106 terminates before the glass plate 106 is positioned on the forming surface of the first bending tool 112. In another embodiment, the fluid flow to the main surface of the glass plate 106 terminates after the glass plate 106 has been positioned on the forming surface of the first bending tool 112.

[0083] In another embodiment, the one or more valves 147 are pushed into a closed position after the plurality of rollers 138 have moved vertically downwards. Therefore, in this embodiment, the fluid flow to the main surface of the glass plate 106 terminates after the plurality of rollers 138 have moved vertically downwards. However, in other embodiments, the one or more valves 147 are pushed into a closed position simultaneously with the commencement of vertical downward movement of the plurality of rollers 138. In these embodiments, the fluid flow to the main surface of the glass plate 106 may terminate when the plurality of rollers 138 are moving vertically downwards or after the plurality of rollers are in a non-operating position. Moreover, in these embodiments, the fluid flow to the main surface of the glass plate 106 may terminate before or after the glass plate 106 is positioned on the forming surface of the first bending tool 112. In other embodiments, the one or more valves 147 are pushed into a closed position, and the plurality of rollers 138 do not move vertically. In these embodiments, it is preferred that the fluid flow to the main surface of the glass plate 106 terminates before or after the glass plate 106 is positioned on the forming surface of the first bending tool 112. In the above embodiments, after adjusting the position of the glass plate 106 relative to the forming surface of the first bending tool 112, the one or more valves 147 can be pushed into the closed position. Therefore, in these embodiments, the fluid flow delivered to the main surface of the glass plate 106 terminates after the position of the glass plate 106 relative to the forming surface of the first bending tool 112 is adjusted.

[0084] The one or more controllers 145 may also communicate with and provide signals to the centering device 102 to adjust the positioning of the glass plate 106. In one embodiment, the one or more controllers 145 provide signals to the first positioner 126 and / or the second positioner 128. In one embodiment, when the first positioner 126 receives a signal, one or more portions 132, 132A of the first positioner 126 move vertically upward from a first configuration to a second configuration, in which the one or more portions 132, 132A of the first positioner 126 contact the glass plate 106 and adjust the position of the glass plate 106 relative to the forming surface 116. In another embodiment, when the first positioner 126 receives a signal, the one or more portions 132, 132A of the first positioner 126 move vertically downward from the second configuration to the first configuration such that they do not interfere with one or more of the bending tools 112, 114 during the bending of the glass plate 106. In other embodiments, when the one or more controllers 145 do not provide a signal to the first positioner 126, the one or more portions 132, 132A of the first positioner 126 may move vertically in an upward or downward direction. In some embodiments, the second positioner 128 may also receive a signal. In one such embodiment, when the second positioner 128 receives a signal, the one or more portions 134, 134A of the second positioner 128 may rotate from a first configuration toward the glass plate 106 to a second configuration, so that the second positioner 128 contacts the glass plate 106 and adjusts the position of the glass plate 106 relative to the forming surface 116. After positioning the glass plate 106, the second positioner 128 may receive another signal from the one or more controllers 145, which causes the one or more portions 134, 134A of the second positioner 128 to rotate from the second configuration away from the glass plate 106 back to the first configuration, so as not to interfere with one or more of the bending tools 112, 114 during the bending of the glass plate 106. In other embodiments, when the second positioner 128 does not receive a signal from the one or more controllers 145, the second positioner 128 rotates toward or away from the glass plate 106. In some embodiments, the one or more controllers 145 are configured to regulate the fluid flow from the one or more fluid sources 144 to the fluid pad assembly 140 and to provide signals to the centering device 102 to adjust the positioning of the glass plate 106. Preferably, the one or more controllers 145 regulate the fluid flow to the fluid pad assembly 140 to support the glass plate 106 and to provide signals to the centering device 102 to adjust the positioning of the glass plate 106 such that the position of the glass plate 106 is adjusted while the fluid flow supports at least a portion of the glass plate 106 above the first bending tool.

[0085] One or more controllers 145 may also communicate with and signal a first bending tool 112 and a drive mechanism (not shown), which enables movement of the plurality of rollers 138 and the fluid pad assembly 140. Signals provided by the one or more controllers 145 to the first bending tool 112 and the drive mechanism (not shown) may guide the first bending tool 112, the plurality of rollers 138, and / or the fluid pad assembly 140 to move vertically in a downward or upward direction. It should also be understood that, in some embodiments, the one or more controllers 145 may also communicate with and signal a second bending tool 114 to guide the second bending tool 114 to move vertically in a downward or upward direction.

[0086] In some embodiments, the one or more controllers 145 may operate under the control of a set of programming instructions and / or provide the aforementioned signals, which may also be referred to as software. The one or more controllers 145 may include a memory (not shown) in which the programming instructions are stored. In one embodiment, the set of programming instructions enables the one or more controllers 145 to regulate fluid flow, the positioning of the glass substrate 106 relative to the forming surface 116, and / or the movement of bending tools 112, 114, the plurality of rollers 138, and / or the fluid pad assembly 140 in a predetermined sequence.

[0087] The one or more controllers 145 may also receive signals. For example, the one or more controllers 145 may communicate with and receive signals from the power supply 149 and / or the operator control device 151. In other embodiments, the one or more controllers 145 may receive signals from the centering device 102, the first bending tool 112, the second bending tool 114, one or more valves 147 and / or the drive mechanism.

[0088] As described above, fluid flow is provided from the one or more fluid sources 144 to the fluid pad assembly 140. Fluid flow is provided from the one or more fluid sources 144 under a first pressure. In one embodiment, the first pressure is 60 psi or higher. However, in other embodiments, the first pressure may be less than 60 psi. In some embodiments, the pressure of the fluid flow is reduced within the fluid pad assembly 140 such that the fluid flow delivered to the glass plate 106 supports the glass plate 106 above the first bending tool 112, but does not cause the glass plate 106 to move vertically upwards to a height that contacts the second bending tool 114. Therefore, within the fluid pad assembly 140, in these embodiments, the fluid flow is at a second pressure. In these embodiments, the first pressure of the fluid flow is greater than the second pressure of the fluid flow. In one embodiment, the pressure of the fluid flow within the fluid pad assembly 140 is 5 psi or less. More specifically, in this embodiment, the pressure of the fluid flow is 5 psi or less within each fluid pad 142.

[0089] Preferably, the fluid flow is provided as pulses and lasts for a relatively short period of time. For example, in one embodiment, the fluid flow is provided as pulses to the fluid pad assembly 140 and lasts for 1 second or less. Preferably, the pulse is provided between 0.1 and 1 second. More preferably, in these embodiments, the pulse is provided for 0.5 seconds or less. When the fluid flow is provided as pulses to the fluid pad assembly 140, it is preferred that the fluid pad assembly 140 delivers the fluid flow as pulses to the main surface of the glass plate 106 and continues for the aforementioned duration. Moreover, in some embodiments, it is preferred that the fluid flow from the fluid pad assembly 140 to the main surface of the glass plate 106 ends after the plurality of rollers 138 begin to move vertically in the downward direction. Thus, when the fluid flow is provided as pulses, the pulse of the fluid can begin when the plurality of rollers are in a first position and end when the plurality of rollers 138 move vertically downward toward the first bending tool 112 from the first position.

[0090] like Figure 2 As shown, the fluid pad assembly 140 can be in fluid communication with two fluid sources 144. In this embodiment, the fluid sources 144 supply pressurized fluid to the fluid pad assembly 140, and the pressurized fluid is supplied to opposite sides of the fluid pad 142 via separate conduits. In another embodiment, similar to... Figure 3 As shown in -5, the fluid pad assembly 140 is in fluid communication with a single fluid source 144. Figure 5 As shown, in this embodiment, a fluid distribution manifold 146 is provided. The fluid distribution manifold 146 has an inlet 148 for receiving a fluid flow from a fluid source 144. The inlet 148 is in fluid communication with an inlet portion 150. The inlet portion 150 is in fluid communication with two or more fluid conduits 152. The fluid conduits 152 are used to distribute fluid to opposite sides of a fluid pad 142. The two or more fluid conduits 152 may also be attached to and used to support the fluid pad 142. Each fluid conduit 152 is in fluid communication with one or more fluid pads 142, and in some embodiments, may be in fluid communication with each fluid pad 142. The fluid distribution manifold 146 may be attached to and supported by a platform 154. In this embodiment, the inlet portion 150 of the fluid distribution manifold may extend through an opening 156 in the platform 154.

[0091] Each fluid pad 142 has a predetermined length L x In the illustrated embodiment, each fluid pad 142 is provided with a length L1–L8 perpendicular to the direction of glass travel. In one embodiment, similar to… Figure 4As shown, each fluid pad 142 has a different length L1–L8. In this embodiment, the length L1–L7 of the fluid pad 142 decreases in the glass travel direction. In other embodiments (not shown), two or more fluid pads may have the same or substantially the same length. Each fluid pad 142 also has a predetermined width. In the illustrated embodiment, the width of each fluid pad 142 is provided in a relationship parallel to the glass travel direction. Moreover, in some embodiments, the widths of the fluid pads 142 may be equal to each other.

[0092] Now refer to Figure 6 -16 describes various embodiments of the fluid pad 142. Although only one fluid pad 142 will be described below, it should be understood that each fluid pad in the fluid pad assembly can be configured as described. Alternatively, in some embodiments, the fluid pad assembly may include one or more fluid pads configured as described below.

[0093] As shown in the figure, in some embodiments, the fluid pad 142 may have sharp edges and include one or more planar outward surfaces. Figure 6 , 9 In one such embodiment best illustrated in 13, the fluid pad 142 may be of a generally rectangular shape. However, in other embodiments, similar to Figure 2 In the embodiment shown, the fluid pad can be another polygonal shape. In other embodiments (not shown), the fluid pad can be defined by one or more curved surfaces.

[0094] Now refer to Figure 6 -16. In one embodiment, each fluid pad 142 has at least one fluid inlet 158 ​​for receiving fluid flow from a fluid source. In one embodiment, the fluid flow is in communication with the fluid inlet 158 ​​via a fluid distribution manifold 146. In another embodiment, each fluid pad 142 has a pair of fluid inlets for receiving fluid flow from the fluid distribution manifold 146. In this embodiment, each fluid inlet 158 ​​of the pair of inlets is attached to and in fluid communication with a fluid conduit 152 of the fluid distribution manifold 146.

[0095] Each fluid inlet 158 ​​is formed in the body portion 160 of the fluid pad 142. Preferably, each fluid inlet 158 ​​is formed in the lower wall 162 of the body portion 160. A pair of opposing sidewalls 164, 166 may be attached to opposite sides of the lower wall 162. A pair of opposing endwalls 168, 170 may be attached to opposite ends of the lower wall 162.

[0096] The fluid pad 142 includes a chamber 172, which is at least partially defined by a lower wall 162, opposing side walls 164, 166, and opposing end walls 168, 170. A diffuser plate 174 is disposed within the chamber 172 and adjacent to each fluid inlet 158. In this location, the diffuser plate 174 serves to laterally distribute fluid within the fluid pad 142 such that the fluid flow is substantially uniform across the entire fluid pad 142 when fluid is discharged from the fluid pad 142.

[0097] Preferably, the diffuser plate 174 is spaced apart from the fluid inlet 158. More particularly, it is preferred that the relationship between the diffuser plate 174 and the fluid inlet 158 ​​is such that the diffuser plate 174 receives the fluid flow from the fluid inlet 158. After receiving the fluid flow from the fluid inlet 158, the diffuser plate 174 is used to laterally distribute the fluid within the fluid pad 142. Furthermore, the diffuser plate 174 can be used to vertically distribute the fluid within the fluid pad 142. In one embodiment, the diffuser plate may be a substantially solid component having an opening aligned with the fluid inlet 158. Figure 6 In the embodiment shown in -8, the fluid pad 142 includes a pair of diffuser plates 174. As... Figure 7 As shown, each diffuser plate 174 is spaced apart from its corresponding fluid inlet 158 ​​by one or more spacers 176 disposed in the chamber 172. In these embodiments, the diffuser plates 174 may be constructed similarly.

[0098] After passing through the diffuser 174, the fluid flow can be vertically guided in the upward direction through the chamber 172 and toward the fluid outlet 178 of the fluid pad 142. Therefore, the chamber 172 is positioned between the fluid inlet 158 ​​and the fluid outlet 178. Preferably, the fluid outlet 178 is positioned near the first main surface of the glass plate 106 to provide sufficient fluid to support the glass plate 106 without damaging it. In one embodiment, the distance (in the upward direction) between the first main surface of the glass plate 106 and the fluid outlet 178 is 5 mm or less. More preferably, the distance is 1 mm or less.

[0099] Fluid flow is discharged from fluid pad 142 via fluid outlet 178. Fluid outlet 178 may include one or more openings 180 for discharging the fluid flow. In embodiments where the one or more openings 180 include a plurality of openings, each of the one or more openings 180 may be circular and have a diameter. In these embodiments, the diameters of the openings 180 may be the same size. In other embodiments, the one or more openings 180 may be of a different shape. Preferably, the one or more openings 180 are formed in the cover member 182. Figure 6 to Figure 8In one such embodiment, the fluid outlet 178 of the fluid pad 142 is defined by a porous cap member. In this embodiment, it is preferred that the one or more openings 180 comprise a plurality of openings, and that the openings of the plurality of openings are spaced apart from each other. Furthermore, in this embodiment, it may be preferred that the space between adjacent openings of the plurality of openings is equal to that between each other. Therefore, in some embodiments, adjacent openings of the plurality of openings are equidistant from each other.

[0100] In one embodiment, the porous cover member 182 may include a screen. In other embodiments (not shown), the cover member 182 may include a mesh. In the above embodiments, a wire braided fabric (not shown) may be positioned above the fluid outlet 178. The wire braided fabric protects the glass plate 106 from damage and helps diffuse the fluid flow after it has been drained from the fluid pad. Figure 9 to Figure 16 In other embodiments shown, the fluid outlet 178 of the fluid pad is defined by one or more nozzle openings 184.

[0101] In embodiments where the fluid flow is heated after the fluid pad assembly 140 receives the fluid flow, it is preferable to provide a heating element 143 in the fluid pad 142. Preferably, the heating element 143 is positioned within a chamber 172. In these embodiments, the heating element 143 can generate heat through resistance heating. The heating element 143 can be positioned substantially along the entire length L of the fluid pad 142. x Extending upwards. Preferably, the heating element 143 is located between the fluid inlet 158 ​​and the fluid outlet 178. More particularly, in one embodiment, the heating element 143 is located between the diffuser plate 174 and the fluid outlet 178. In this position, the heating element 143 can heat the fluid flow to a selected temperature before the fluid flow exits from the fluid pad assembly 140 and contacts the glass plate 106.

[0102] like Figure 9 -10 As best shown, the nozzle openings 184 can be aligned with each other in a direction perpendicular to the glass travel. Alternatively, as Figure 14 As best shown, nozzle opening 184 can be aligned with certain nozzle openings 184A and oriented at an acute angle relative to other nozzle openings 186, 186A. In this embodiment, nozzle opening 184 is arranged at an acute angle relative to two adjacent nozzle openings 186, 186A. The two adjacent nozzle openings 186, 186A separate nozzle opening 184 from another nozzle opening 184A aligned with nozzle opening 184.

[0103] Nozzle openings 184, 184A, and 186 may be circular. However, the nozzle openings may be of another shape. In some embodiments, the fluid pad 142 may include a plurality of nozzle openings 184, 184A, 186, and 186A, and two or more of the plurality of nozzle openings may have the same shape. In this embodiment, the two or more nozzle openings may be circular. In another embodiment, the fluid pad 142 includes the plurality of nozzle openings 184, 184A, 186, and 186A, and each nozzle opening has the same shape. In other embodiments (not shown), the fluid pad may include a plurality of nozzle openings, and two or more of the plurality of nozzle openings may have different shapes.

[0104] Each nozzle opening 184, 184A, 186, 186A is configured as part of nozzles 188, 190. Therefore, the fluid pad 142 may include one or more nozzles 188, 190. In some embodiments, such as Figure 13 As shown in -16, nozzle 190 may include a pair of nozzle openings 186, 186A. In these embodiments, the pair of nozzle openings 186, 186A may have the same shape. Each nozzle 188, 190 is attached to the fluid pad sidewalls 164, 166 and is disposed between the fluid pad sidewalls 164, 166 and spaced apart from the fluid pad lower wall 162.

[0105] The one or more nozzles 188, 190 of the fluid pad can be constructed in a similar or other manner. In one embodiment, the nozzles 188, 190 include body portions 192, 192A. The body portions 192, 192A can be formed of metal or another sufficiently rigid material. The body portions 192, 192A can at least partially define the fluid pad chamber 172.

[0106] Fluid inlet 194 is disposed in the main body portions 192, 192A and is in fluid communication with chamber 172. When nozzle 190 includes a pair of nozzle openings 186, 186A, the main body portion may include a pair of fluid inlets 194, 194A. Fluid inlets 194, 194A are in fluid communication with fluid inlet portions 196, 196A, which may be cylindrical in shape. Fluid inlet portions 196, 196A extend upward into grooves 198, 198A. One end of fluid inlet portions 196, 196A is in fluid communication with one end of grooves 198, 198A. The opposite ends of grooves 198, 198A are in fluid communication with nozzle openings 186, 186A.

[0107] The grooves 198, 198A may have a generally conical shape. In one embodiment, the grooves 198, 198A have a truncated conical shape. Baffles 200, 202, 202A may be disposed in the grooves 198, 198A between opposite ends. When baffles are provided, baffles 200, 202, 202A may be fixed to wall portions 204, 204A in the grooves 198, 198A. Wall portions 204, 204A at least partially define the shape of the grooves 198, 198A. In one embodiment, similar to... Figure 12 In the embodiment shown, the baffle 200 is secured to the wall portion 204 using one or more fasteners 206. In another embodiment, as... Figure 16 As shown, baffles 202 and 202A are fixed to the wall portion 204 by press fitting.

[0108] In some embodiments, such as Figure 13 As shown in -16, the nozzle 190 may include a pair of slots 198, 198A. Each slot 198, 198A in the pair of slots may be as described above, and in these embodiments, baffles 202, 202A may be provided in each slot 198, 198A.

[0109] Return to reference Figure 1 After being conveyed onto the plurality of rollers 138, the glass plate 106 continues to move in the glass travel direction. Fluid flow is discharged from the fluid pad assembly 140 before reaching the first positioner 126. The glass plate 106 receives and contacts the fluid flow from the fluid pad assembly 140. The fluid flow supports at least a portion of the glass plate 106. While the glass plate 106 is supported, its position can be adjusted by the position of the first positioner 126 and / or the second positioner 128 relative to the forming surface 116 of the first bending tool 112. After the position of the glass plate 106 is adjusted, the plurality of rollers 138 can move vertically downwards to facilitate the placement of the glass plate 106 onto the first bending tool 112. In other embodiments, once the glass plate 106 is supported by the fluid flow, the plurality of rollers 138 can move vertically downwards. In these embodiments, the plurality of rollers 138 can move in a direction toward the first bending tool 112 before the glass plate 106 is placed onto the first bending tool 112. Furthermore, in this embodiment, when the plurality of rollers 138 move as described above, the fluid pad assembly 140 can move vertically toward the first bending tool 112 in a downward direction. Additionally, before the glass plate 106 is placed on the first bending tool 112, the first bending tool 112 can move vertically toward the plurality of rollers 138. For example, in this embodiment, the first bending tool 112 can move from, for example... Figure 1The optimal non-working position is shown to move vertically upwards toward the plurality of rollers 138. However, in other embodiments, it is preferred that the first bending tool 112 remains stationary and remains stationary. Figure 1 The non-working position is shown until the glass plate 106 is placed thereon. In other embodiments, the plurality of rollers 138 may not move vertically before the glass plate 106 is placed on the first bending tool 112. Instead, in these embodiments, the glass plate 106 to be supported is placed on the first bending tool 112 by vertical movement of the first bending tool 112 in an upward direction from the non-working position toward the plurality of rollers 138. It should be understood that in embodiments where the first bending tool 112 moves toward the plurality of rollers 138, the first bending tool 112 also moves toward the glass plate 106 before the glass plate 106 is placed on the first bending tool 112. In all the above embodiments, at least a portion of the glass plate 106 is supported by a fluid flow and is placed on the forming surface 116 of the first bending tool 112.

[0110] Advantageously, the arrangement of the glass plate 106 on the forming surface 116 of the first bending tool 112, as described above, and the use of the glass forming production line 100 results in improved alignment between the glass plate 106 and the forming surface 116 prior to bending. This improved alignment imparts the desired properties to the glass plate 106 and ensures high quality after bending. Furthermore, because at least a portion of the glass plate 106 is not contacted by the plurality of rollers 138 before being arranged on the first bending tool 112, optical distortion caused by markings on the glass plate 106 can be reduced compared to other forming methods and glass forming production lines.

[0111] If the glass plate 106 is to be bent, once the glass plate 106 is positioned on the first bending tool 112, preferably the first bending tool 112 moves toward the second bending tool 114 without the second bending tool 114 moving, in order to bend the glass plate 106. In this embodiment, after the first bending tool 112 moves, the glass plate 106 is bent between the first bending tool 112 and the second bending tool 114. However, in other embodiments, the first bending tool 112 may move toward the second bending tool 114, and the second bending tool 114 may move toward the first bending tool 112. Alternatively, the second bending tool 114 may move toward the first bending tool 112 without the first bending tool 112 moving. In any of these alternatives, the aim is to achieve relative movement between the first bending tool 112 and the second bending tool 114 to bend the glass plate 106 between the first bending tool 112 and the second bending tool 114.

[0112] During pressing, a vacuum can be drawn on the channel 208 formed in the second bending tool 114 to allow the glass plate 106 to be formed into the desired shape. After the glass plate 106 is formed, it can be released from the second bending tool 114 by applying positive pressure through the channel 208.

[0113] Once the bending process is complete, a conveying device (not shown) is used to transport the formed glass sheet 106 into an annealing furnace 210. In the annealing furnace 210, the formed glass sheet 106 can be tempered or annealed as known in the art, and cooled to a temperature suitable for processing. The formed glass sheet 106 can be used to construct vehicle windows, such as windshields, side windows, sunroofs, or rear windows. Such windows can be integral or laminated.

[0114] In accordance with patent regulations, the present invention has been described in what is considered to represent its preferred embodiments; however, it should be noted that the present invention may be practiced in ways different from those specifically shown and described without departing from its scope or spirit.

Claims

1. A method for forming a glass plate, comprising: A glass plate is provided, the glass plate having a first main surface, an opposing second main surface, a leading edge, a trailing edge, and opposing side surfaces; A glass forming production line is provided, the glass forming production line including a preheating furnace, after which a bending workstation is provided, the bending workstation including a centering device and a first bending tool, wherein the first bending tool is an annular mold and has a forming surface for receiving the glass sheet; The glass plate is conveyed through the preheating furnace on multiple rollers to a position located in the bending workstation, wherein the glass plate is directly above one or more of the multiple rollers, and wherein the entire glass plate is directly above the first bending tool; Subsequently, at least a portion of the glass plate is supported above the first bending tool in the bending workstation by delivering a fluid flow to the first main surface of the glass plate; The glass plate is arranged on the forming surface of the first bending tool; and When at least a portion of the glass plate is supported by the fluid flow, the position of the glass plate relative to the forming surface of the first bending tool is adjusted by using the centering device to contact at least one of the leading edge, trailing edge, and opposing side of the glass plate.

2. The method according to claim 1, wherein, The position of the glass plate relative to the forming surface of the first bending tool is adjusted before the glass plate is placed on the forming surface of the first bending tool; or the position of the glass plate relative to the forming surface of the first bending tool is adjusted after the glass plate is placed on the forming surface of the first bending tool.

3. The method of claim 1, further comprising moving the plurality of rollers in a direction toward the first bending tool before placing the glass plate on the first bending tool.

4. The method of claim 1, further comprising supporting the glass plate on the forming surface of the first bending tool.

5. The method of claim 1, further comprising conveying the glass plates on the plurality of rollers at a certain height, wherein, The fluid flow delivered to the first or second main surface of the glass plate raises the glass plate above the stated height.

6. The method of claim 1, further comprising discharging the fluid flow from the fluid pad assembly.

7. The method according to claim 1, wherein, The fluid flow delivered to the first or second main surface of the glass plate is terminated before or after the glass plate is placed on the forming surface of the first bending tool.

8. The method of claim 6, further comprising heating the fluid flow before discharging the fluid flow from the fluid pad assembly; or wherein, The fluid pad assembly includes one or more fluid pads.

9. A glass forming production line, comprising: A preheating furnace is provided, followed by a bending workstation, the bending workstation including a first bending tool having a forming surface for receiving a glass plate having a first main surface, an opposing second main surface, a leading edge, a trailing edge, and opposing side surfaces; Multiple rollers for conveying the glass plate through the preheating furnace to a position fully located in the bending workstation and above the first bending tool; A fluid pad assembly comprising one or more fluid pads, each fluid pad configured to deliver a fluid flow to a first primary surface or a second primary surface of a glass plate for supporting at least a portion of the glass plate over a first bending tool, wherein at least one of the one or more fluid pads includes a fluid inlet for receiving the fluid flow from a fluid source and a fluid outlet for discharging the fluid flow from the fluid pad, wherein a chamber is provided between the fluid inlet and the fluid outlet, and wherein the fluid outlet includes a plurality of openings formed in a cover member; and A centering device for adjusting the position of the glass plate relative to the forming surface of the first bending tool, wherein the centering device includes a first locator disposed around the outer peripheral edge of the first bending tool, the first locator being configured to contact at least one of the leading edge, trailing edge, and opposing side of the glass plate when at least a portion of the glass plate is supported by the fluid flow, to adjust the position of the glass plate fully located in the bending workstation.

10. The glass forming production line of claim 9, further comprising one or more controllers, the one or more controllers communicating with one or more valves to provide signals to the one or more valves to regulate the fluid flow from one or more fluid sources to the fluid pad assembly.

Images