TW202012324A - Glass for display suppressing the occurrence of defects such as cracks on end faces in display glass - Google Patents

Abstract

Disclosed is a display glass that has four sides and is rectangular in a plan view, and each of the four sides in relation to the other sides that intersect is between +0.3 degree to -0.3 degree with respect to the direction of 90 degrees. The end face strength of the end face on each of the four sides is 100 MPa or more, the distance between the highest point and the lowest point to the surface of the end face is the largest height that is 100μm or less, the thickness is 0.3mm or more, and the length of at least one side is 2500 mm or more and 5000 mm or less.

Description

Display glass

The invention relates to a display glass and a method for manufacturing display glass.

As a manufacturing method of a glass substrate for FPD (Flat Panel Display) glass substrates, in particular for glass for liquid crystals, a manufacturing method known as a float method disclosed in Patent Document 1 and the like is known. The float method is a method of making molten glass flow onto tin in a molten tin bath, spreading the molten glass over tin to make a glass ribbon, and finally forming a ribbon-shaped plate glass with a specific thickness. The ribbon-shaped sheet glass formed by the molten tin bath is led out to the cold cooling section provided on the downstream side of the molten tin bath, where it is cooled to a specific temperature, and then continuously transported to the fold by a transport mechanism such as a roller conveyor The device is cut and folded into a glass plate of the required size. The cut and folded glass sheet is transported by a roller conveyor to a specific storage section, where it is stored piece by piece to a pallet, etc., and is picked as a finished product or as a semi-finished product.

Patent Document 2 discloses a technique for detecting the conveyance amount of a strip-shaped plate glass by using a specific conveyance amount detection device in order to achieve correct cutting and folding of the strip-shaped plate glass. The conveyance amount detection device includes a first roll that is in contact with the band-shaped plate glass and rotates, and a second roll that is in contact with the first roll and rotates, and the thermal expansion coefficient of the second roll is lower than that of the sheet of the first roll Thermal expansion rate.

Patent Document 3 discloses a cutting device that cuts a glass sheet along a cutting line. This cutting device rotates a cutting roller provided with a first protrusion on the surface of the roller, and uses the first protrusion to push up the lower surface of the glass plate below the cutting line. Furthermore, a second protrusion is provided on the upstream surface of the cutting roller in the rotation direction. [Prior Technical Literature] [Patent Literature]

[Patent Document 1] Japanese Patent Laid-Open No. 8-277131 [Patent Document 2] Japanese Patent Laid-Open No. 2012-12123 [Patent Document 3] Japanese Patent No. 5605726

[Problems to be solved by the invention]

The above-mentioned various previous technologies are for the purpose of improving the processing accuracy at the time of manufacture or preventing the breakage, etc., and have not studied the concerns in the operation of the manufactured glass, especially the thinner display glass. For example, a glass for a display that has not been chamfered with an end face has a certain amount of unevenness on the end face, and the strength of the end face is also insufficient. Therefore, the glass for displays may have defects such as cracks on the end surface during transportation, etc., and the countermeasures against such defects are insufficient.

In addition, as a method for cutting a glass plate having an end surface with relatively few irregularities, a whole cutting using a laser is known. This cutting method is suitable for cutting a thin glass plate of, for example, about 200 μm. However, with the increase in the thickness of the glass sheet, there is a problem that the cutting time increases, it is difficult to realize the cutting within the practical time, and it is difficult to achieve the cutting with a high linearity.

The present invention provides a display glass that can suppress defects such as cracks on the end surface. [Technical means to solve the problem]

The display glass of the present invention has four sides and a rectangular display glass in plan view, and each of the four sides has a range of +0.3 degrees to -0.3 degrees relative to the direction of 90 degrees for the other sides that intersect Inner intersection, the strength of the end face of each of the four sides is more than 100 MPa, the distance between the highest point and the lowest point on the surface of the end face is the maximum height of less than 100 μm, the thickness is more than 0.3 mm, and the length of at least one side is 2500 mm or more and 5000 mm or less.

In the display glass of the present invention, for example, the above-mentioned end face intersects the first principal surface and the second principal surface in a plan view in the range of +5 degrees to -5 degrees with respect to the direction of 90 degrees. [Effect of invention]

According to the present invention, it is possible to suppress defects such as cracks on the end surface in the glass for display.

Hereinafter, preferred embodiments of the glass for displays and the method for manufacturing the glass for displays of the present invention will be described based on the accompanying drawings.

FIG. 1 is a plan view of a display glass according to an embodiment of the present invention. The display glass 110 is rectangular (square or rectangular) in plan view, and has four sides including a first side 101, a second side 102, a third side 103, and a fourth side 104. The first main surface 121 forming the overall shape of the display glass 110 in plan view and the second main surface 122 facing the first main surface 121 are surrounded by four sides, and the first main surface 121 or the second main surface 122 constitute a display Use the front or back of the glass 110.

Here, the display glass 110 corresponds to, for example, a glass plate that is a semi-finished product before being assembled into a liquid crystal panel, and is called a so-called plain plate. The display glass 110 may be cut out in a manner consistent with the size of the final liquid crystal panel, or may be larger than the size. However, no chamfering or grinding was applied to the end faces existing on the four sides.

The thickness of the display glass 110 is preferably 0.3 mm or more, more preferably 0.4 mm or more, further preferably 0.5 mm or more, and still more preferably 0.6 mm or more. The upper limit of the thickness of the glass for display is not particularly limited, and is usually 1 mm or less. Moreover, it is desirable that the glass 110 for displays does not include the thickness of 0.3 mm or less. By setting the thickness to such a range, a thin liquid crystal panel can be easily manufactured. However, such thin display glass is difficult to manufacture and handle. For example, when transferring to another location after manufacturing and performing chamfering or grinding, sufficient care must be taken to avoid defects such as cracks on the end surface during transportation. However, the industry has not fully considered such concerns. In view of this situation, the inventors have conducted intensive studies and found that the glass for displays that satisfies the following various necessary conditions is preferred.

First, in the display glass 110 of the present embodiment, each of the four sides satisfies the so-called specific linearity. The so-called straightness means that a specific side extends at a 90-degree vertical direction with respect to other sides that intersect at an angle, and extends at a slope within a specific angle range. As shown in FIG. 2, the inclination angle γ ₁ corresponds to the angle at which the fourth side 104 inclines so as to extend outward of the display glass 110 in the direction from the third side 103 toward the first side 101, and is (+ ) Angle display (the fourth side 104A in FIG. 2). On the other hand, the inclination angle γ ₂ corresponds to the angle at which the fourth side 104 inclines so as to extend inside the display glass 110 in the direction from the third side 103 toward the first side 101, and the angle (-) It is shown (the fourth side 104B in FIG. 2). In the display glass 110 of the present embodiment, the fourth side 104 as one side and the other side (the third side 103) intersecting at an angle are in the range of +0.3 degrees to -0.3 degrees with respect to the direction of 90 degrees Intersect. In this embodiment, by adopting such straightness (also referred to as a straight angle) on each side, the occurrence of cracks, cracks, etc. on the end surface 111 during transportation is suppressed. Furthermore, in this example, it is assumed that the angle formed by the second side 102 and the third side 103 is 90 degrees, and the rectilinearity is measured using the right-angle vernier 150.

In addition, the strength of the end faces 111 (refer to FIGS. 3 and 4) of each of the four sides is based on JIS (Japanese Industrial Standards) R1601:2008 or ISO (International Organization for Standardization) 14704 : 2000 4 point bending test or 3 point bending test to verify, and set the end surface strength for evaluation. In the display glass 110 of the present embodiment, the strength of the end face verified by such a regulation is 100 MPa or more. The strength of the end face of the previous glass is less than 100 MPa. However, in the present embodiment, the end face 111 has such a sufficiently large strength to suppress the occurrence of cracks and cracks during transportation.

In order to cut out as much glass as possible for the liquid crystal panel, at least one of the four sides of the glass 110 for display has a length of 2500 mm or more and 5000 mm or less. More preferably, the length of one side is 2800 mm or more. As the size becomes larger, defects such as cracks in the end surface 111 are likely to occur, but the occurrence of such defects is suppressed in the display glass 110 of the present embodiment.

The four sides of the display glass 110 and the end surfaces 111 of the four sides of the present embodiment all satisfy all the above-mentioned necessary conditions. With such a configuration, a glass 110 for a display that can effectively suppress the defects of the end face is provided. Furthermore, the glass 110 for a display of this embodiment preferably satisfies the requirements described below.

As shown in FIG. 3, each of the four sides of the display glass 110 has the above-mentioned end surface 111. FIG. 3( a) shows an end surface 111 in an ideal state. The end surface 111 intersects the first main surface 121 and the second main surface 122 at 90 degrees. However, the end surface 111 is not limited to being formed in such an ideal state, as shown in FIG. 3(b), there are cases where the end surface 111 is formed in a state of being obliquely offset. Here, as shown in FIG. 3( c ), the state of the oblique deviation of the end surface 111 is defined by the angle of the end surface 111, especially the angle with respect to the first main surface 121 or the second main surface 122.

The inclination angle θ ₁ corresponds to the angle at which the end surface 111 inclines so as to extend outward of the display glass 110 in the direction from the second main surface 122 toward the first main surface 121, and is expressed as a (+) angle (FIG. 3 (c) the end face 111A). On the other hand, the inclination angle θ ₂ corresponds to the angle at which the end surface 111 inclines so as to extend inward of the display glass 110 in the direction from the second main surface 122 toward the first main surface 121, and the angle (-) Is shown (the end face 111B in FIG. 3(c)). In the display glass 110 of the present embodiment, it is preferable that the end surface 111 and the first main surface 121 or the second main surface 122 are within a range of +5 degrees to -5 degrees with respect to a direction of 90 degrees shown by a broken line. Intersect. By adopting such a configuration of the end surface 111, the occurrence of cracks, cracks, etc. of the end surface 111 during transportation is particularly suppressed.

FIG. 4 shows an enlarged view of the surface of the end surface 111. The surface of the end surface 111 is formed into a concave-convex shape. However, in the display glass 110 of the present embodiment, the maximum height Δz, which is the distance between the highest point and the lowest point on the surface of the end surface 111, is suppressed to 100 μm or less. The end face of the previous glass is Δz>100 μm. However, in this embodiment, the end face 111 adopts such a surface shape with a small roughness to suppress the occurrence of cracks and cracks on the end face 111 during transportation.

In the glass 110 for a display of this embodiment, it is desirable that the four sides and the end surfaces 111 of all four sides satisfy all the above-mentioned necessary conditions. With such a configuration, a glass 110 for a display that can effectively suppress the defects of the end face is provided.

Next, a method of manufacturing the display glass 110 of the embodiment will be described. FIG. 5 shows a manufacturing apparatus for manufacturing glass 110 for a display.

As shown in the figure, the manufacturing apparatus includes: a glass melting tank 51 for melting glass raw materials and clarifying the melted glass; a floating bath 53 for flowing molten glass onto the molten metal layer 52 such as molten metal tin, and It floats and travels on one side, thereby forming a flat ribbon glass (glass ribbon) of a certain width and thickness; Xu Leng furnace 57, which has ribbon glass G to remove the self-floating bath 53 and cool it as much as possible The first chilling chamber 55 and the second chilling chamber 56 where strain occurs inside the ribbon glass G; a cutting table 58 that cuts the ribbon glass G carried out from the chilling furnace 57 to a specific size; and The pallet 59 sorts and packs the display glass 110 of FIG. 1 manufactured in the form of cut sheet glass. Furthermore, the ribbon glass G is represented by a solid line, so it is shown as flowing in the direction of arrow A in the right direction of the figure at intervals on the molten metal layer 52 in the floating bath of FIG. , The ribbon glass G flows in contact with the molten metal surface.

In this example, the glass melting tank 51, the floating bath 53, and the Xu Cooling Furnace 57 are installed in a building (hereinafter referred to as the first building 60) that is surrounded by the outside atmosphere, and the cutting table 58 and the picking table 59 is also installed in a building (hereinafter referred to as a second building 61) that becomes a surrounding structure. However, the specific design of the manufacturing device such as which part is disposed in which building is not particularly limited.

The display glass 110 that is packed or loaded into the container at the pallet 59 is usually transported to another place, and chamfering and polishing the end surface 111 are processed to assemble the liquid crystal panel.

FIG. 6 is a conceptual diagram showing the manufacturing steps inside the floating bath 53 and the second building 61, and FIG. 7 is a cross-sectional view taken along line P-P in FIG. The molten glass ribbon G flowing out of the glass melting tank 51 into the floating bath 53 flows on the molten metal layer (melted tin, etc.) 52 in the floating bath 53 to form a plate-shaped ribbon glass G. The melted ribbon glass G gradually cools and hardens while flowing in the direction A (transport direction), thereby becoming a plate-shaped ribbon glass G. The ribbon-shaped glass G is pulled from the molten metal layer 52 in the downstream region, and is conveyed to the downstream chilling furnace 57 and the cutting table 58 by the rotation of the roller conveyor 12.

The floating bath 53 includes an upper roller 40 that applies tension to the molten ribbon glass G on the molten metal layer 52 in the width direction. By the action of the upper roller 40, the ribbon glass G is processed to have a desired width and thickness. As shown in FIG. 6, the upper rollers 40 are used in pairs, pressing both side edges of the molten ribbon glass G on the molten metal layer 52 to apply tension to the ribbon glass G in the width direction. A plurality of pairs of upper rollers 40 are arranged at intervals along the flow direction of the ribbon glass G.

The upper roller 40 has a rotating member in contact with the ribbon glass G at the front end portion. By rotating the rotating member, the ribbon glass G is sent out in a specific direction. While applying tension to the upper roller 40 by a plurality, the ribbon glass G gradually cools and hardens while flowing in a specific direction.

By the stretching action of the upper roller 40, thick side edges (so-called edge portions) F are formed on both side edges F of the ribbon glass G in the width direction (Y direction in FIG. 6). The surface of the side edge portion F naturally forms a specific stripe pattern during the chilling process. The edge portions F on both sides are located at any position further downstream and are removed at any time.

The ribbon glass G is transported by the roller conveyor 12 further downstream and passes through the chilling furnace 57 and is transported to the cutting table 58 of the second building 61, which is cut by a cutting line processing device arranged at a specific position on the cutting table 58 Break. FIG. 8 is a perspective view showing the outline of the cutting wire processing device 80 provided on the cutting table 58. The cutting line processing device 80 is a cutting line processing method called so-called different-size cutting of a longitudinal cutting line and a transverse cutting line for processing the ribbon glass G continuously transported from the first building 60 by the roller conveyor 12 Corresponding cutting line processing devices are provided at least on the downstream side of the imaging devices 71 and 72 in FIGS. 6 and 7 described below. However, the cutting line processing device 10 is not limited to cutting with different sizes.

The dicing wire processing apparatus 80 includes a longitudinal dicing wire processing machine 14 provided on the upstream side of the ribbon glass G in the conveyance direction, and a lateral dicing wire processing machine 16 provided on the downstream side thereof. A longitudinal cutting line (the X direction in FIG. 6) parallel to the conveying direction of the ribbon glass G is processed on the ribbon glass G by the longitudinal cutting line processing machine 14, and a transverse cutting line processing machine 16 is applied to the belt on the downstream side A transverse cutting line (Y direction in FIG. 6) orthogonal to the conveying direction of the ribbon glass is processed on the glass G.

The slitting machine 14 includes a plurality of cutter wheels 18, 18... provided in the width direction of the ribbon glass G. The cutter wheels 18, 18... are moved forward and backward with respect to the ribbon glass G being conveyed by the roller conveyor 12 by a well-known forward and backward movement mechanism, and are pressed to the belt with a specific pressing force by the forward and backward movement Shaped glass G. With this, a longitudinal cutting line parallel to the conveying direction of the ribbon glass G is processed on the ribbon glass G.

The cutter wheel 18 is attached to the beam portion (guide frame) 26 at specific intervals via the feed mechanism 22. The beam portion 26 spans the roller conveyor 12 and is provided in a direction orthogonal to the conveying direction of the ribbon glass G. In addition, the feed mechanism 22 has: a fixing portion 30 that is movably fixed to two slits 28 that are elongated in the horizontal direction of the beam portion 26; and a support member 46, one end of which is connected to the fixing portion 30, and The other end is provided with a cutter wheel 18. In addition, the ball screw device connected to the fixed portion 30 of the feed mechanism 22 is provided in the hollow beam portion 26. By driving the ball screw device, in the horizontal slit 28 formed in the beam portion 26, the fixed portion 30 The support member 46 and the cutter wheel 18 move in a sliding manner in conjunction with each other. By this, the position of the cutter wheel 18 in the direction orthogonal to the conveyance direction of the ribbon glass G is adjusted.

On the other hand, the cross-cutting machine 16 includes a cutter wheel 20 that moves diagonally in the Z direction with respect to the conveying direction of the ribbon glass G in synchronization with the conveying speed of the ribbon glass G. With this, a transverse cutting line in a direction orthogonal to the conveying direction of the ribbon glass G is processed on the ribbon glass G.

A motor (not shown) that causes the cutter wheel 20 to move obliquely is synchronized with the conveyance speed of the ribbon glass G, and the oblique movement speed of the blade glass is controlled by the control device. The transverse cutting line of the direction perpendicular to the conveying direction of the glass G. Moreover, the cutter wheel 20 is provided so that it can move up and down with respect to the band-shaped glass G by actuators, such as an air cylinder and a servo motor. In order to produce a transverse cutting line with a good cutting depth, the cutter wheel 20 starts to descend in advance by a specific amount of the cutting line machining start point by the actuator. After that, the cutter wheel 20 moves diagonally on the ribbon glass G along the guide frame 21 by the driving force of the motor. With this, the horizontal cutting line is processed. After that, the cutter wheel 20 moves up from the ribbon glass G by the actuator after a certain amount of the end point through the cutting line processing, and then returns to the original cutting line standby position by the motor.

As described above, the slit glass 58 is subjected to the processing of the longitudinal cutting line and the horizontal cutting line on the cutting table 58, and the display glass shown in FIG. 1 is cut out by a cutting device (see FIG. 10) provided further downstream 110 size. In order to cut out the display glass 110 with the correct size, the vertical cutting line and the horizontal cutting line must be processed at the correct position. The ribbon glass G always moves in the conveying direction (direction A) by the rotation of the roller conveyor 12, so it is important to cut the cutting line in the conveying direction, that is, the horizontal cutting line, and it is necessary to correctly grasp the conveying direction The moving speed of the ribbon glass G is cut at the correct time.

In the prior art described in Patent Document 2 etc., a member of a specific roller such as abutting and rotating the ribbon glass is used to grasp the moving speed in the A direction. However, no matter what kind of roller is used, the roller will be deformed due to thermal expansion and other factors, so it is difficult to maintain the correct detection of the moving speed.

Therefore, in the manufacturing method and manufacturing apparatus of the display glass of the present embodiment, the moving speed of the ribbon glass G is detected using the two-sided edge portions F cut off at any time as shown in FIGS. 6 and 7. The stripe patterns formed on the surface of the edge portions F on both sides are constantly changing, and there is no case where the exact same pattern is formed at two or more positions. Therefore, as shown in FIGS. 6 and 7, at least two camera devices 71 and 72 capable of photographing the pattern are provided inside the second building 61. An unillustrated computer captures and maintains the image captured by the first camera device 71 on the upstream side. Furthermore, the computer captures and maintains the image captured by the second camera 72 on the downstream side, and compares the two images at a specific rate to compare whether the two images are consistent. When the two images match, the computer can calculate the moving speed of the ribbon glass G according to the shooting time and the distance between the first imaging device 71 and the second imaging device 72.

Based on the calculated moving speed, the computer can determine the time when the cross-cutting line processing machine 16 of the cutting line processing device 80 located downstream of the camera devices 71 and 72 cuts, and send the cutting line processing device 80 the appropriate Driving signal at time. As a result, the cross-cutting line processing machine 16 can cut the cross-cutting line at the correct position in the longitudinal direction (the X direction in FIG. 6) of the ribbon glass G. In addition, the shooting position by the imaging devices 71 and 72 is not particularly limited, and it can also be performed inside the Xu Leng furnace 57 and at least at the cutting position (not shown) of the edge F on both sides of the cutting table 58 , Or more upstream than the position of the cutting line processing device 80.

通常因由玻璃之重量或搬送輥之重量引起之搬送輥之撓曲或搬送輥之熱變形、裝置之振動、樑部26或導引架21之撓曲等各種因素，而於玻璃板之製造中發生變動，從而不會成為90度±1度以內。本發明人等反覆進行實驗，發現藉由上述方法獲得之端面之狀態變差，且於所獲得之顯示器用玻璃之端面容易產生裂紋或龜裂。因此，於本實施形態中，將角度

控制為90度±1度以內。藉由此種控制，能以相對於帶狀玻璃G之表面接近垂直之角度形成切割線L(橫切割線或縱切割線)，可適當地形成顯示器用玻璃110之端面111。角度

係於製造裝置之運轉開始前進行調整，但亦可於運轉中監視角度並自動地進行控制。FIG. 9( a) shows an enlarged front view of the cutter wheel 20 of the horizontal wire cutting machine 16 or the cutter wheel 18 of the longitudinal wire cutting machine 14. The angle between the surface of the band glass G before cutting and the cutter wheel

Usually due to various factors such as the deflection of the conveying roller caused by the weight of the glass or the weight of the conveying roller or the thermal deformation of the conveying roller, the vibration of the device, the deflection of the beam portion 26 or the guide frame 21, etc. There is a change so that it does not fall within 90 degrees ± 1 degree. The inventors repeatedly conducted experiments and found that the state of the end surface obtained by the above method deteriorates, and cracks or cracks are easily generated on the end surface of the obtained display glass. Therefore, in this embodiment, the angle

Control within 90 degrees ± 1 degree. By such control, the cutting line L (horizontal cutting line or vertical cutting line) can be formed at an angle close to the vertical with respect to the surface of the band glass G, and the end surface 111 of the display glass 110 can be appropriately formed. angle

It is adjusted before the operation of the manufacturing device is started, but the angle can be monitored and automatically controlled during operation.

As shown in FIG. 9(a), the cutter wheel 20 or the cutter wheel 18 forms a horizontal cutting line or a vertical cutting line, and continuously supplies oil such as kerosene from an oil supply device (not shown) provided adjacent to each other. Kerosene allows the cutter wheel and cutting line to travel smoothly at the same time, preventing the scattering of glass chips from the cutting line. As shown in FIG. 9(b), the oil supply device is used for the area with a width within ±0.5 mm to ±1 mm relative to the cutting line L (0.5 mm≦D ₁ ≦1 mm, 0.5 mm≦D ₂ ≦1 mm ) The way of supplying oil controls the oil supply. With this control, the cutting line L can be formed smoothly.

FIG. 10 is a schematic view of a cutting device (glass breaking device) 90 arranged on the downstream side of the cutting line processing device 80 of FIG. 8. The cutting device 90 includes a cutting roller 91 and a pressing roller 92. The device shown here is a device that sequentially cuts the ribbon glass G along a horizontal cutting line to cut out the display glass 110. The cutting roller 91 rises as shown by the arrow B at the time when the cutting line L (transverse cutting line) arrives, and abuts against the lower surface of the ribbon glass G. On the other hand, when the cutting line L (horizontal cutting line or vertical cutting line) arrives, the pressing roller 92 descends as shown by the arrow C and abuts on the upper surface of the band glass G. When the cutting roller 91 and the pressing roller 92 press the ribbon glass G from opposite directions up and down, the ribbon glass G can be cut along the cutting line L.

Therefore, the timing of raising the cutting roller 91 and the lowering of the pressing roller 92, especially the timing of raising the cutting roller 91 are important matters. In this embodiment, the timing is controlled such that, for example, the cutting roller 91 is in contact with the surface of the ribbon glass G in a region W that is ±0.5 mm to ±1 mm in the conveyance direction relative to the cutting line L. At this point, the cutting roller is raised. As a result, the cutting line L can be smoothly formed, and the end surface 111 of the glass 110 for a display can be appropriately formed. For example, two camera devices that shoot the cutting line L (transverse cutting line) can be arranged between the cutting line processing device 80 and the cutting device 90. According to each shooting time and distance, the computer moves the speed of the ribbon glass G, Especially the calculation of the moving speed of the cutting line L. The computer can determine the timing at which the cutting roller 91 rises based on the calculated moving speed, and send a drive signal to the cutting device 90 at the appropriate timing.

偏離90度±1度之範圍，從而對帶狀玻璃G、進而顯示器用玻璃110之品質造成影響。因此，於本實施形態中，適當配置將輥式輸送機12之中央區域予以支持之支持構件43，從而抑制輥式輸送機12之撓曲。藉此，可實現帶狀玻璃G、顯示器用玻璃110之品質之穩定化。FIG. 11 shows a supporting member that supports the central area of the roller conveyor 12. The roller conveyor 12 has a certain length, even if it is made of a material that ensures a certain rigidity, it may deflect, resulting in an angle

Deviating from the range of 90 degrees ± 1 degree, thereby affecting the quality of the ribbon glass G and further the glass 110 for display. Therefore, in this embodiment, the support member 43 that supports the central area of the roller conveyor 12 is appropriately arranged to suppress the deflection of the roller conveyor 12. As a result, the quality of the ribbon glass G and the display glass 110 can be stabilized.

As shown in FIG. 11, the support member 43 includes a support rod 41 and a roller 42. The surface of the roller conveyor 12 is recessed at the central portion in the longitudinal direction of the roller conveyor 12 to form a concave portion 12 a and a reduced diameter portion 12 b. One end of the support rod 41 is fixed to the ground L, and the roller 42 is rotatably disposed at the other end of the support rod 41.

FIG. 12(a) is an enlarged side view of the contact portion of the roller conveyor 12 and the support member 43 obtained from the lateral view of FIG. 11. The roller 42 of the support member 43 is in a rotatable state and the reduced diameter of the roller conveyor 12 The portion 12b is in contact, and supports the reduced diameter portion 12b from below. Thereby, the support member 43 can suppress the deflection of the roller conveyor 12, and prevent the adverse effect on the quality of the ribbon glass G and the glass 110 for a display. FIG. 12(b) is the application form of FIG. 12(a), and a plurality of rollers 42 (two in this example) may be used to support the diameter-reducing portion 12b from below to improve stability. In addition, a plurality of support members 43 may be provided along the longitudinal direction of the roller conveyor 12.

FIG. 13 is a schematic view of a plate-shaped body packing box 301 for packing a plurality of sheets of display glass 110 laminated, and FIG. 13(a) shows an overall cross-sectional view and an enlarged view of a support portion. The plate-shaped body packing box 301 is prepared on the board picking table 59 or other tables in the manufacturing apparatus shown in FIG. 5 and is used to place the manufactured display glass 110.

The plate-shaped body packing box 301 of the present embodiment (hereinafter also simply referred to as "bundling box 301") stores a plurality of pieces (for example, 120 pieces) of display glass 110 in a state of being stacked substantially horizontally. When placed flat in the packing box, in order to prevent the display glass 110 from directly contacting each other, it is preferable to laminate the plate-like body with a thin spacer paper in between. The packing box 301 includes a pedestal 302, an upper cover 303 disposed on the pedestal, and a locking portion 304 disposed on a side of the pedestal. The packing box 301 preferably conforms to the shape of the stored display glass 110 and is rectangular in plan view.

A bottom bar 306 is provided on one side of the base 302 of this embodiment. When stacking the display glass 110 on the pedestal 302, generally, the display glass 110 is stacked in a state where the pedestal 302 is tilted obliquely. At this time, the pedestal 302 is placed with the bottom pole 306 facing down tilt. The bottom rod 306 is a rectangular plate-shaped member that supports the bottom edge portion of the stacked display glass 110. From the viewpoint of ensuring the stability of the display glass 110, it is preferable that a plurality of bottom rods 306 are provided on one side of the base, for example, two bottom rods 306 are provided on one side of the base 302.

In addition, four posts 307 are provided at four corners of the base 302. As shown in the enlarged view surrounded by a single dotted line in FIG. 13, a support part 309 having a conical shape with a truncated top and a trapezoidal cross section is formed on the top of the column 307. The support part 309 can be placed on the base 302 via the support part 309. Pedestal. As shown in the variation of FIG. 13(b), the support portion 310 having a shape close to a pure cone (only the front end becomes a curved surface) may be used.

The upper cover 3 is an opening on the lower surface and surrounds the stacked display glass 110 from above, and can be attached to and detached from the uppermost base 302 as shown in FIG. 13.

In order to stabilize the stored display glass 110, the locking portion 304 is arranged on at least two of the four sides of the pedestal 302, but it is preferably arranged on three sides. When it is arranged on three sides, it is preferably arranged on three sides other than the side on which the bottom bar 306 is provided. In addition, the locking portion 304 may be arranged on each side of the pedestal 302 individually or in plural, for example, one may be arranged on one side of the pedestal 302 or two.

The locking portion 304 may be a material that can ensure the strength of the glass 110 for supporting the display, and may also be a non-ferrous metal such as aluminum or a non-metal such as resin. The shape is not particularly limited, and for example, it may be an L-shape as shown in FIG. 13.

FIG. 14 is a diagram showing a fixing structure when the locking portion 304 is arranged on the base 302. In this embodiment, at least two fixing pins 320 are provided on the side of the base 302 where the locking portion 304 is provided, the fixing pin 320 includes a shaft portion 321 and a head with a diameter larger than the shaft portion部322. In addition, at least two or more fixing grooves 323 for receiving the fixing pin 320 are provided in the horizontal direction corresponding to the fixing pin 320 in the locking portion 304. The fixing groove includes an inverted F-shaped groove that is open to the lower end of the locking portion 304 and two horizontal portions 325 formed continuously with the vertical portion 324. The widths of the vertical portion 324 and the horizontal portion 325 are larger than the fixed The diameter of the shaft portion 321 of the pin 320 is smaller than the diameter of the head 322. In this embodiment, corresponding to the two horizontal portions 325, two fixing pins 320 are also provided in the vertical direction.

When mounting the locking portion 304 on the pedestal 302, first, as shown in FIG. 14(a), the shaft portion 321 of the fixing pin 320 is inserted into the lower end of the vertical portion 324 of the fixing groove 323 so that the locking portion 304 is downward Swipe in the direction. After that, when the shaft portion 321 of the fixing pin 320 reaches the connecting portion of the vertical portion 324 and the horizontal portion 325 of the fixing groove 323, as shown in FIG. 14(b), the locking portion 304 is slid in the horizontal direction to make The shaft portion 321 of the fixing pin 320 reaches the end of the horizontal portion 325 of the fixing groove 323, whereby the locking portion 304 can be fixed to the base 302. 4(c) is a diagram showing a state where the locking portion 304 is fixed to the base 302. FIG.

In this way, the display glass 110 stacked on the pedestal 302 is pressed against the pedestal 302 with a certain force by the locking portion 304 provided on the pedestal 302 in a manner that does not vibrate during transportation. As a result, even if an impact is received from the outside when the packaging box is transported, the packaging box itself vibrates with the transportation, and the display glass 110 is held in a stable state. Moreover, it is preferable to place a plate-like body (not shown) such as resin, corrugated cardboard, wood, etc. on the last plate-like body after being laid flat as a buffer material, so as to avoid the direct contact of the locking portion to cause defects, dirt, etc. .

<Examples> Hereinafter, Examples of the present invention are shown in Table 1, and Comparative Examples are shown in Table 2. In the following Table 1 and Table 2, the "straight angle" of parameter 1 corresponds to the inclination angle γ ₁ and the inclination angle γ _{2 in} FIG. 2, and the “end surface strength” of parameter 2 corresponds to the result obtained by the 4-point bending test The strength of the end faces in Figures 3 and 4; the "concaveness of the end face" in parameter 3 is equivalent to the maximum height Δz in Figure 4, and the "angle of the end face" in parameter 4 is equivalent to the inclination angle θ ₁ and inclination in Figure 3(c). Angle θ ₂ .

，製法條件2之「折斷方法」中，「攝像」相當於使用有攝像裝置之圖10之切斷用輥上升之控制方法，「輥壓」相當於有效利用專利文獻2中所揭示之輥之方法，製法條件3之「煤油之寬度」相當於圖9(b)之煤油之供給區域D₁ 、D₂ 。The "angle with the cutter wheel" of manufacturing method condition 1 is equivalent to the angle between the surface of the glass and the cutter wheel in Fig. 9(a)

In the "breaking method" of manufacturing method condition 2, "imaging" is equivalent to the control method for raising the cutting roller of FIG. 10 using an imaging device, and "rolling" is equivalent to effectively using the roller disclosed in Patent Document 2. In the method, the "width of kerosene" in manufacturing method 3 corresponds to the kerosene supply areas D ₁ and D _{2 in} FIG. 9(b).

"Load on glass" refers to the maximum load applied to the glass when the container with more than 100 sheets of glass of 2500 mm × 2800 mm or more is moved at a speed of 40 km to 100 km per hour for more than 1 hour. The case where none of the glass piled up when such a load is applied is broken is indicated by 0, and even if one piece is broken, it is indicated by ×.

[Table 1]

[Table 2]

Regarding the parameters of the glass of Example 1, the straight angle is 0.1 degrees, the end surface strength is 102 MPa, the end surface irregularities are 5.0 μm, and the end surface angle is 0.42 degrees. The glass was manufactured under the manufacturing conditions that the angle with the cutter wheel is 90.2 degrees, the breaking method is the method of FIG. 10, and the width of the kerosene is 0.8 mm. It was found that even if more than 100 pieces of the glass of Example 1 were applied under the above conditions, one piece of broken glass would not occur, and excellent glass for display could be obtained.

Regarding the parameters of the glass of Example 2, the straight angle is -0.13 degrees, the end surface strength is 107 MPa, the end surface irregularities are -4.0 μm, and the end surface angle is -0.33 degrees. The glass was manufactured under the manufacturing condition that the angle with the cutter wheel was 89.7 degrees, the breaking method was the method of FIG. 10, and the width of the kerosene was 0.6 mm. It was found that even if more than 100 pieces of the glass of Example 2 were applied under the above conditions, one piece of broken glass would not occur, and excellent glass for display could be obtained.

Regarding the parameters of the glass of Example 3, the straight angle is 0.05 degrees, the strength of the end surface is 148 MPa, the unevenness of the end surface is 3.1 μm, and the angle of the end surface is 0.12 degrees. The glass was manufactured under the manufacturing conditions that the angle with the cutter wheel was 89.9 degrees, the breaking method was the method of FIG. 10, and the width of the kerosene was 0.9 mm. It was found that even if more than 100 pieces of the glass of Example 3 were applied under the above conditions, one piece of broken glass would not occur, and excellent glass for display could be obtained.

Regarding the parameters of the glass of Example 4, the straight angle is -0.06 degrees, the end surface strength is 145 MPa, the end surface irregularities are -4.1 μm, and the end surface angle is -0.11 degrees. The glass was manufactured under the manufacturing conditions that the angle with the cutter wheel is 90.1 degrees, the breaking method is the method of FIG. 10, and the width of the kerosene is 0.7 mm. It was found that even if more than 100 pieces of the glass of Example 4 were applied under the above conditions, one piece of broken glass would not occur, and excellent display glass could be obtained.

Regarding the parameters of the glass of Example 5, the straight angle is 0.03 degrees, the end surface strength is 186 MPa, the end surface irregularities are 1.8 μm, and the end surface angle is 0.04 degrees. The glass was manufactured under the manufacturing condition that the angle with the cutter wheel is 90.0 degrees, the breaking method is the method of FIG. 10, and the width of the kerosene is 0.8 mm. It was found that even if more than 100 pieces of the glass of Example 5 were applied under the above conditions, one piece of broken glass was not generated, and excellent glass for display was obtained.

Regarding the parameters of the glass of Example 6, the straight angle is -0.02 degrees, the end surface strength is 210 MPa, the end surface irregularities are -1.1 μm, and the end surface angle is -0.05 degrees. The glass was manufactured under the manufacturing conditions that the angle with the cutter wheel is 90.0 degrees, the breaking method is the method of FIG. 10, and the width of the kerosene is 0.6 mm. It was found that even if more than 100 pieces of the glass of Example 6 were applied under the above conditions, one piece of broken glass would not occur, and excellent glass for display could be obtained.

According to the results as described above, it can be understood that each of the four sides of the display glass intersects the other sides in the range of +0.3 degrees to -0.3 degrees relative to the direction of 90 degrees, and each of the four sides When the end surface strength of the end surface is 100 MPa or more, excellent display glass can be obtained. Also, it was found that the distance between the highest point and the lowest point on the surface of the end face, that is, the maximum height (concavo-convex of the end face) is 100 μm or less, and the end face is 90 degrees relative to the first and second principal faces in plan view When the directions intersect within the range of +5 degrees to -5 degrees, particularly excellent display glass can be obtained.

On the other hand, regarding the parameters of the glass of Comparative Example 1, the straight angle is 0.4 degrees, the strength of the end surface is 80 MPa, the unevenness of the end surface is 111 μm, and the angle of the end surface is 6.11 degrees. This glass was manufactured under the manufacturing conditions that the angle with the cutter wheel is 92.0 degrees, the breaking method is the method of Patent Document 2, and the width of kerosene is 0.1 mm. It was found that when more than 100 pieces of the glass of Comparative Example 1 were applied under the above conditions, the glass that did not break at a load of 0 to 0.5 G, but the glass that broke at a load of 0.5 to 10 G was uncomfortable Used for display glass.

Regarding the parameters of the glass of Comparative Example 2, the straight angle is -0.5 degrees, the end surface strength is 73 MPa, the end surface irregularities are -123 μm, and the end surface angle is -5.29 degrees. The glass was manufactured under the manufacturing conditions that the angle with the cutter wheel was 88.0 degrees, the breaking method was the method of Patent Document 2, and the width of kerosene was 0.1 mm. It was found that when a load of 100 or more glasses of Comparative Example 2 was applied under the above conditions, the glass that did not break at a load of 0 to 0.5 G, but the glass that broke at a load of 0.5 to 10 G was uncomfortable Used for display glass.

Regarding the parameters of the glass of Comparative Example 3, the straight angle was 0.3 degrees, the end surface strength was 85 MPa, the end surface irregularities were 21.2 μm, and the end surface angle was 2.52 degrees. This glass was manufactured under the manufacturing conditions that the angle with the cutter wheel was 88.2 degrees, the breaking method was the method of Patent Document 2, and the width of kerosene was 0.3 mm. It was found that when more than 100 pieces of glass of Comparative Example 3 were loaded under the above conditions, the glass that did not break when the load was 0 to 0.5 G, but the glass that broke when the load was 0.5 to 10 G, was uncomfortable Used for display glass.

Regarding the parameters of the glass of Comparative Example 4, the straight angle is -0.4 degrees, the end surface strength is 88 MPa, the end surface irregularities are -18.8 μm, and the end surface angle is -3.05 degrees. This glass was manufactured under the manufacturing conditions that the angle with the cutter wheel is 91.7 degrees, the breaking method is the method of Patent Document 2, and the width of kerosene is 0.2 mm. It was found that when a load of more than 100 glasses of Comparative Example 4 was applied under the above conditions, the glass that did not break at a load of 0 to 0.5 G, but the glass that broke at a load of 0.5 to 10 G was uncomfortable Used for display glass.

Regarding the parameters of the glass of Comparative Example 5, the straight angle is 0.21 degrees, the end surface strength is 95 MPa, the end surface irregularities are 13.3 μm, and the end surface angle is 1.80 degrees. The glass was manufactured under the manufacturing conditions that the angle with the cutter wheel was 88.7 degrees, the breaking method was the method of Patent Document 2, and the width of kerosene was 0.4 mm. It was found that when a load of 100 or more glasses of Comparative Example 5 was applied under the above conditions, the glass that did not break at a load of 0 to 0.5 G, but the glass that broke at a load of 0.5 to 10 G was uncomfortable Used for display glass.

Regarding the parameters of the glass of Comparative Example 6, the straight angle is -0.18 degrees, the end surface strength is 90 MPa, the end surface irregularities are -9.2 μm, and the end surface angle is -1.30 degrees. This glass was manufactured under the manufacturing conditions that the angle with the cutter wheel was 91.2 degrees, the breaking method was the method of Patent Document 2, and the width of kerosene was 0.3 mm. It was found that when more than 100 pieces of the glass of Comparative Example 6 were applied under the above conditions, the glass that did not break at a load of 0 to 0.5 G, but the glass that broke at a load of 0.5 to 10 G was uncomfortable Used for display glass.

According to the results described above, it can be understood that when each of the four sides of the display glass does not intersect the other sides, it intersects within the range of +0.3 degrees to -0.3 degrees relative to the direction of 90 degrees, and /Or when the end surface strength of the end surfaces of each of the four sides is not 100 MPa or more, it is difficult to obtain excellent display glass. In addition, when it is determined that the distance between the highest point and the lowest point on the surface of the end face, that is, the maximum height (concave-convex of the end face) is not 100 μm or less, and/or the end face does not correspond to the first and second principal faces in plan view Even when the surface intersects within the range of +5 degrees to -5 degrees with respect to the direction of 90 degrees, it is difficult to obtain excellent display glass.

、所獲得之顯示器用玻璃之端面強度、及端面之表面上之最高點與最低點之距離即最大高度Δz和端面裂紋之產生容易度之關係，進行以下所示之試驗1～試驗5。In order to further investigate in detail when manufacturing the glass for display, the angle between the surface of the band glass G before cutting and the cutter wheel

The relationship between the strength of the end face of the obtained display glass and the distance between the highest point and the lowest point on the surface of the end face, that is, the maximum height Δz and the ease of occurrence of end face cracks, were tested as shown in Tests 1 to 5 below.

於90°－1.8°～90°＋1.8°為止之範圍內變動，而製造顯示器用玻璃。於各

下製造3000片顯示器用玻璃。於上述「對玻璃之負荷」成為0.5～10 G之條件下將所獲得之顯示器用玻璃搬運50 km以上，對產生端面裂紋之片數進行計數。將結果示於表3及圖15。(Test 1) The above manufacturing method condition 2 was set to "imaging", and the manufacturing method condition 3 was set to be fixed, so that the angle of manufacturing method condition 1

It can be changed within the range of 90°-1.8°～90°+1.8° to manufacture display glass. Yu Ge

3000 pieces of glass for display are manufactured below. Under the condition that the "load to glass" is 0.5 to 10 G, the obtained display glass is transported for more than 50 km, and the number of cracks on the end face is counted. The results are shown in Table 3 and FIG. 15.

[table 3]

保持於90度±1度以內，而獲得不易產生端面裂紋之顯示器用玻璃。It can be made clear from the above Table 3 and FIG. 15 that by changing the angle

Keep it within 90 degrees ± 1 degree, and obtain display glass that is less prone to end cracks.

於90°－2.2°～90°＋2.2°之範圍內每次變動0.2°，而製造顯示器用玻璃。於各

下製造3000片顯示器用玻璃，測定所獲得之顯示器用玻璃之端面強度。將結果示於表4及圖16。(Test 2) The above manufacturing method condition 2 is set to "imaging", and the manufacturing method condition 3 is set to be fixed, so that the angle of manufacturing method condition 1 is

Within the range of 90°-2.2°～90°+2.2°, each change is 0.2°, and the glass for display is manufactured. Yu Ge

Next, 3000 pieces of display glass were manufactured, and the end surface strength of the obtained display glass was measured. The results are shown in Table 4 and Figure 16.

[Table 4]

保持為90度±1度以內，而獲得端面強度為100 MPa以上之顯示器用玻璃。It can be made clear from the above Table 4 and Figure 16 that

Keep the temperature within 90 degrees ± 1 degree, and obtain the display glass with an end surface strength of 100 MPa or more.

(Test 3) The maximum height Δz of the end surface of the glass for display obtained in Test 2 was measured. The results are shown in Table 5 and FIG. 17. [table 5]

保持為90度±1度以內，而獲得端面之最大高度Δz為100 μm以下之顯示器用玻璃。It can be made clear from the above Table 5 and FIG. 17 that by changing the angle

Keep the temperature within 90 degrees ± 1 degree, and obtain the display glass with a maximum height Δz of 100 μm or less.

(Test 4) 3000 pieces of display glass with different end strengths were prepared at each end strength. Under the condition that the "load to glass" is 0.5 to 10 G, the prepared display glass is transported for more than 50 km, and the number of end cracks is counted. The results are shown in Table 6 and Figure 18.

[Table 6]

It is clear from the above Table 6 and FIG. 18 that the display glass having an end surface strength of 100 MPa or more is particularly unlikely to cause end surface cracks.

(Test 5) 3000 pieces of glass with different Δz were prepared for each Δz. Under the condition that the "load to glass" is 0.5 to 10 G, the prepared display glass is transported for more than 50 km, and the number of end cracks is counted. The results are shown in Table 7 and FIG. 19.

[Table 7]

It is clear from the above Table 7 and FIG. 19 that the display glass having a Δz of 100 μm or less is particularly unlikely to cause end-face cracks.

According to the present invention, it is possible to suppress the occurrence of defects such as cracks and cracks on the end surface of the display glass for transportation. The method of stacking the display glass during transportation (vertical, horizontal, etc.) and the form of packing (spacer, pallet, etc.) are not particularly limited.

In addition, the present invention is not limited to the above-mentioned embodiment, and can be appropriately changed, improved, or the like. In addition, the material, shape, size, numerical value, form, number, arrangement location, etc. of each constituent element in the above-mentioned embodiments are arbitrary and not limited as long as they can reach the cost of the inventor. [Industry availability]

The present invention has been described in detail with reference to specific embodiments, but it is obvious to those skilled in the art that various changes or modifications can be applied without departing from the spirit and scope of the present invention. This application is based on the Japanese patent application 2018-165344 filed on September 4, 2018, and the contents thereof are incorporated herein by reference.

According to the present invention, it is possible to suppress the occurrence of defects such as cracks on the end surface in the glass for displays, and it is possible to provide the glass for displays efficiently and inexpensively.

:角度12: roller conveyor 12a: concave portion 12b: reduced diameter portion 14: longitudinal cutting line processing machine 16: horizontal cutting line processing machine 18: cutter wheel 20: cutter wheel 21: guide frame 22: feed mechanism 26: beam section (Guide frame) 28: slit 30: fixed part 40: upper roller 41: support rod 42: roller 43: support member 46: support member 51: glass melting tank 52: molten metal layer 53: floating bath 55: No. 1 Xu cold room 56: second Xu cold room 57: Xu cold furnace 58: cutting table 59: picking table 60: first building 61: second building 71: first camera 72: second camera 80: Cutting line processing device 90: cutting device 91: cutting roller 92: pressing roller 101: first side 102: second side 103: third side 104: fourth side 104A: fourth side 104B: fourth side 110 : Display glass 111: End surface 111A: End surface 111B: End surface 121: First main surface 122: Second main surface 150: Right-angle vernier scale 301: Plate-shaped packing box 302: Pedestal 303: Upper cover 304: Locking portion 306 : Bottom bar 307: column 309: support part 310: support part 320: fixing pin 321: shaft part 322: head of the shaft part 323: fixing groove 324: vertical part 325: horizontal part D ₁ : kerosene supply area D ₂ : Supply area of kerosene F: Side edge G: Ribbon glass L: Cutting line W: Area X: Direction Y: Direction γ ₁ : angle of inclination γ ₂ : angle of inclination θ ₁ : angle of inclination θ ₂ : angle of inclination Δz: maximum height

:angle

FIG. 1 is a plan view of a display glass according to an embodiment of the present invention. Fig. 2 is a conceptual diagram showing the straightness of an edge. Fig. 3 shows an enlarged cross-sectional view near the end surface of the display glass, (a) is the end surface in an ideal state, (b) is the end surface in a state of being obliquely shifted, and (c) is a diagram defining the angle of the end surface. Fig. 4 is a conceptual diagram showing the maximum height of the end face. Fig. 5 is an overall view of a display glass manufacturing apparatus. FIG. 6 is a diagram of both side edges (edge portions) of display glass and a conceptual diagram of an imaging device that photographs it. 7 is a cross-sectional view taken along line P-P in FIG. 6. Fig. 8 is an overall view of a cutting line processing device. Fig. 9(a) is an enlarged view of the cutter wheel in the cutting line processing device, and Fig. 9(b) is a conceptual view showing the supply area of kerosene for the cutting line. Fig. 10 is a conceptual diagram of a cutting device (glass breaking device). Fig. 11 is a front view of the supporting member supporting the roller conveyor. Fig. 12 is an enlarged side view of the contact portion of the roller conveyor and the supporting member obtained by observing Fig. 11 from the lateral direction, (a) is a basic form, and (b) is an application form. 13 is a diagram showing a plate-shaped body packing box in which glass for a display is stored, (a) is a cross-sectional view of the entire body and an enlarged view of a support portion, and (b) is an enlarged view of a modification of the support portion. 14 is a diagram showing a method of fixing the locking portion to the pedestal, (a) is a view showing a state in which the shaft portion of the fixing pin is inserted into the fixing groove, and (b) is a diagram showing the locking portion sliding in the horizontal direction State diagram, (c) is a diagram showing the state where the locking portion is fixed to the pedestal. 15 is a graph showing the results of Test 1. Fig. 16 is a graph showing the results of Test 2. Fig. 17 is a graph showing the results of Test 3. Fig. 18 is a graph showing the results of Test 4. Fig. 19 is a graph showing the results of Test 5.

101: Side 1

102: 2nd side

103: 3rd side

104: 4th side

110: glass for display

121: 1st main face

122: 2nd main face

Claims (2)

A display glass, which has four sides and is rectangular in plan view, and Each of the four sides intersects the other sides that intersect within the range of +0.3 degrees to -0.3 degrees relative to the direction of 90 degrees, The strength of the end face of each of the four sides is 100 MPa or more, The distance between the highest point and the lowest point on the surface of the above end surface, that is, the maximum height is 100 μm or less, The thickness is more than 0.3 mm, The length of at least one side is 2500 mm or more and 5000 mm or less. The display glass according to claim 1, wherein the end face intersects the first principal surface and the second principal surface in a plan view in a range of +5 degrees to -5 degrees with respect to a direction of 90 degrees.

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