阅读说明：本技术 显示器用玻璃 (Glass for display ) 是由 石田涉 小峯聪 于 2019-09-03 设计创作，主要内容包括：一种具有4边的在俯视下为矩形状的显示器用玻璃,其中,4边的各个边相对于相交的其他边在相对于90度的方向+0.3度～-0.3度的范围内相交,4边的各个边的端面的端面强度为100MPa以上,端面的表面上的最高点与最低点的距离即最大高度为100μm以下,厚度为0.3mm以上,至少1边的长度为2500mm以上且5000mm以下。(A display glass having 4 sides and being rectangular in a plan view, wherein each of the 4 sides intersects with the other sides which intersect within a range of +0.3 DEG to-0.3 DEG with respect to a direction of 90 DEG, an end face strength of an end face of each of the 4 sides is 100MPa or more, a maximum height which is a distance between a highest point and a lowest point on a surface of the end face is 100 [ mu ] m or less, a thickness is 0.3mm or more, and a length of at least 1 side is 2500mm or more and 5000mm or less.)

1. A display glass having 4 sides and being rectangular in a plan view, wherein,

each of the 4 sides intersects with the other sides which intersect each other in a range of +0.3 degrees to-0.3 degrees with respect to the direction of 90 degrees,

the strength of the end face of each of the 4 sides is 100MPa or more,

the maximum height, which is the distance between the highest point and the lowest point on the surface of the end surface, is 100 [ mu ] m or less,

the thickness of the film is more than 0.3mm,

the length of at least 1 side is 2500mm or more and 5000mm or less.

2. The glass for display use according to claim 1,

the end faces intersect with the first main face and the second main face in a range of +5 degrees to-5 degrees with respect to a direction of 90 degrees in a plan view.

Technical Field

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

Background

As a method for producing a glass plate used for a glass substrate for an FPD (Flat Panel Display), particularly for a glass for a liquid crystal, a production method called a float method disclosed in patent document 1 and the like is known. The float method is as follows: molten glass is poured onto tin in a molten tin bath, and the molten glass is spread over the tin to form a glass ribbon, which is finally formed into a ribbon-shaped sheet glass having a predetermined sheet thickness. The strip-shaped sheet glass formed by the molten tin bath is drawn out to a gradually cooling portion provided on the downstream side of the molten tin bath, cooled to a predetermined temperature, and then continuously conveyed to a cutting device by a conveying unit such as a roller conveyor to be cut into glass sheets of a desired size. The cut glass sheets are conveyed to a predetermined storage portion by a roller conveyor, and stored one by one in a tray or the like, and picked as a product or an intermediate product.

Patent document 2 discloses a technique for detecting the amount of conveyance of a belt-shaped glass sheet by using a predetermined conveyance amount detection device for accurate cutting of the belt-shaped glass sheet. The conveyance amount detection device includes a first roller that rotates in contact with the belt-shaped sheet glass and a second roller that rotates in contact with the first roller, and the second roller has a lower thermal expansion coefficient than the first roller.

Patent document 3 discloses a cutting device for cutting a glass sheet along a cutting line. The cutting device rotates a cutting roller having a first protrusion on a roller surface, and lifts up a lower surface of the glass sheet below a cutting line by the first protrusion. Further, a second protrusion is provided on the upstream side surface of the cutting roller in the rotation direction of the first protrusion.

Disclosure of Invention

Problems to be solved by the invention

The various conventional techniques described above have not been studied about concerns about handling manufactured glass, particularly thin glass for displays, for the purpose of improving processing accuracy during manufacturing, preventing breakage, and the like. For example, a display glass that has not been subjected to chamfering of the end face has a predetermined amount of unevenness on the end face, and the strength of the end face is insufficient. Therefore, defects such as cracks may occur at the end surface of the glass for display during transportation or the like, and measures against such defects are not sufficient.

As a method for cutting a glass plate that can obtain an end face with relatively few irregularities, overall cutting using a laser is known. This cutting method is suitable for cutting a thin glass plate of, for example, about 200 μm. However, the increase in the thickness of the glass sheet has a problem that the time taken for cutting increases, and cutting within practical time becomes difficult, and cutting with high straightness becomes difficult.

The invention provides a glass for a display, which can inhibit the generation of defects such as cracking of end faces.

Means for solving the problems

The glass for display of the present invention is a glass for display having 4 sides and being rectangular in a plan view, wherein each of the 4 sides intersects with the other sides intersecting in a range of +0.3 to-0.3 degrees with respect to a direction of 90 degrees, an end face strength of an end face of each of the 4 sides is 100MPa or more, a maximum height, which is a distance between a highest point and a lowest point on a surface of the end face, is 100 μm or less, a thickness is 0.3mm or more, and a length of at least 1 side is 2500mm or more and 5000mm or less.

In the glass for display of the present invention, for example, the end faces intersect with the first main face and the second main face in a range of +5 degrees to-5 degrees with respect to a direction of 90 degrees in a plan view.

Effects of the invention

According to the present invention, the occurrence of defects such as cracking of the end face can be suppressed in the glass for display.

Drawings

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 edges.

Fig. 3 is an enlarged cross-sectional view showing the vicinity of the end face of the display glass, (a) is an end face in an ideal state, (b) is a view of an end face in a state of being obliquely deviated, and (c) is a view in which the angle of the end face is defined.

Fig. 4 is a conceptual diagram showing the maximum height of the end face.

Fig. 5 is an overall view of a manufacturing apparatus of the glass for display.

Fig. 6 is a conceptual diagram of both side edge portions (ear portions) of the display glass and an imaging device for imaging the same.

Fig. 7 is a sectional view taken along line P-P of fig. 6.

Fig. 8 is an overall view of the cutting wire processing apparatus.

Fig. 9(a) is an enlarged view of the cutter wheel in the cutting wire processing apparatus, and fig. 9(b) is a conceptual view showing a supply region of the lamp oil with respect to the cutting wire.

Fig. 10 is a conceptual diagram of a cutting device (glass breaking device).

Fig. 11 is a front view of a support member supporting the roller conveyor.

Fig. 12 is an enlarged side view of a contact portion between the roller conveyor and the support member when viewed in the lateral direction of fig. 11, where (a) is a basic form and (b) is an applied form.

Fig. 13 is a view showing a plate-like body packing box in a state where the display glass is housed, where (a) is an entire cross-sectional view and an enlarged view of the support portion, and (b) is an enlarged view of a modified example of the support portion.

Fig. 14 is a diagram showing a method of fixing the locking portion to the base, (a) is a diagram showing a state in which the shaft portion of the fixing pin is inserted into the fixing groove, (b) is a diagram showing a state in which the locking portion is slid in the horizontal direction, and (c) is a diagram showing a state in which the locking portion is fixed to the base.

Fig. 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.

Detailed Description

Preferred embodiments of the display glass and the method for manufacturing the display glass according to the present invention will be described below with reference to 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 has a rectangular shape (square or rectangular) in a plan view, and has 4 sides including a first side 101, a second side 102, a third side 103, and a fourth side 104. A first main surface 121 and a second main surface 122 facing the first main surface 121, which form the entire shape of the display glass 110 in a plan view, are surrounded by 4 sides, and the first main surface 121 or the second main surface 122 constitutes the front surface or the back surface of the display glass 110.

The display glass 110 herein corresponds to, for example, a glass plate as an intermediate product before being assembled to a liquid crystal panel, and is a product called a so-called mother plate. The display glass 110 may be cut out to match the size of the final liquid crystal panel, or may be larger than this size. However, chamfering and polishing on the end faces existing on the 4 sides were not performed.

The thickness of the display glass 110 is preferably 0.3mm or more, more preferably 0.4mm or more, still more preferably 0.5mm or more, and still more preferably 0.6mm or more. The upper limit of the thickness of the glass for display is not particularly limited, but is usually 1mm or less. The display glass 110 is preferably glass having a thickness of 0.3mm or less.

When the thickness is in such a range, a thin liquid crystal panel can be easily manufactured.

However, such thin glass for display is difficult to manufacture and handle. For example, when chamfering or polishing is performed after the production and then the transfer to another place, sufficient attention must be paid to avoid defects such as cracking of the end face during transportation. However, such concerns have not been fully considered. In view of the above circumstances, the inventors have intensively studied and found that a display glass satisfying the following various requirements is preferable.

First, in the display glass 110 of the present embodiment, each of the 4 sides satisfies a so-called predetermined linearity. The straightness means that a predetermined 1 side extends at a slope within a range of a predetermined angle with respect to a perpendicular direction of 90 degrees with respect to the other sides intersecting at an angle. As shown in fig. 2, the inclination angle γ₁The angle at which the fourth side 104 is inclined so as to extend outward of the display glass 110 in the direction from the third side 103 toward the first side 101 is represented by the angle of (+) (see fig. 2The fourth side 104A). On the other hand, the inclination angle γ₂An angle corresponding to the fourth side 104 inclined so as to extend toward the inside of the display glass 110 in the direction from the third side 103 toward the first side 101 is represented by an angle of (-) a (fourth side 104B in fig. 2). In the display glass 110 of the present embodiment, the fourth side 104, which is 1 side, intersects with the other sides (the third side 103) intersecting at an angle in a range of +0.3 degrees to-0.3 degrees with respect to the direction of 90 degrees. In the present embodiment, such straightness (also referred to as squareness) is obtained on each side, and thereby occurrence of cracks or flaws on the end surface 111 during transportation is suppressed. In this example, the angle formed by the second side 102 and the third side 103 is assumed to be 90 degrees, and the straightness is measured using the rectangular scale 150.

The strength of the end surface 111 (see fig. 3 and 4) of each of the 4 sides is determined by the following equation in accordance with JIS R1601: 2008 or ISO 14704: the test was verified by a 4-point bending test or a 3-point bending test of 2000, and the end face strength was evaluated. The display glass 110 of the present embodiment has an end face strength of 100MPa or more as verified by the above specification. The strength of the end face of the conventional glass is smaller than 100MPa, but in the present embodiment, the end face 111 has such a sufficiently large strength, and thereby occurrence of cracks, and the like during transportation is suppressed.

In order to cut out as much glass for a liquid crystal panel as possible, the length of at least 1 of the 4 sides of the glass for display 110 is 2500mm or more and 5000mm or less. The length of 1 side is more preferably 2800mm or more. The increased size tends to cause defects such as cracks on the end surface 111, but the occurrence of such defects is suppressed in the display glass 110 of the present embodiment.

In the display glass 110 of the present embodiment, all of the end surfaces 111 on the 4 sides and the 4 sides satisfy all of the above requirements. With such a configuration, the display glass 110 capable of effectively suppressing defects at the end face is provided. The display glass 110 of the present embodiment preferably satisfies the requirements described below.

As shown in fig. 3, the display glass 110 has the above-described end surfaces 111 at each of the 4 sides. Fig. 3(a) shows an end surface 111 in an ideal state, and the end surface 111 intersects the first main surface 121 and the second main surface 122 at an angle of 90 degrees. However, the end surface 111 is not necessarily formed in such an ideal state, and the end surface 111 may be formed in a state of being obliquely deviated as shown in fig. 3 (b). Here, the state in which the end surface 111 is obliquely offset is defined by the angle of the end surface 111, particularly the angle with respect to the first main surface 121 or the second main surface 122, as shown in fig. 3 (c).

Inclination angle theta₁The angle at which the end surface 111 is inclined 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 is represented by a (+) angle (the end surface 111A in fig. 3 c). On the other hand, the inclination angle θ₂The angle corresponding to the inclination of the end surface 111 in the direction from the second main surface 122 toward the first main surface 121 so as to extend inward of the display glass 110 is represented by (-) an angle (the end surface 111B in fig. 3 c). In the glass for display 110 of the present embodiment, the end surface 111 preferably intersects with the first main surface 121 or the second main surface 122 in a range of +5 degrees to-5 degrees with respect to the direction of 90 degrees shown by the broken line. By arranging the end surface 111 in this manner, the occurrence of cracks or the like in the end surface 111 during transportation is particularly suppressed.

Fig. 4 shows an enlarged view of the surface of the end face 111. The surface of the end surface 111 has a concave-convex shape, but in the glass for display 110 of the present embodiment, the maximum height Δ z, 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 conventional glass is Δ z >100 μm, but in the present embodiment, the end face 111 has such a surface shape with small roughness, and thus, the occurrence of cracks, and the like in the end face 111 during transportation is suppressed.

The display glass 110 of the present embodiment preferably satisfies all of the above requirements at the 4-side and 4-side end surfaces 111. With such a configuration, the display glass 110 capable of effectively suppressing defects at the end face is provided.

Next, a method for manufacturing the display glass 110 according to the embodiment will be described. Fig. 5 shows a manufacturing apparatus for manufacturing the glass for display 110.

As shown in the figure, the manufacturing apparatus includes: a glass melting tank 51 for melting glass raw materials and clarifying the molten glass; a float bath 53 for flowing molten glass onto a molten metal layer 52 such as molten metallic tin, floating the molten glass while running the molten glass, and forming flat ribbon-shaped glass (glass ribbon) having a constant width and thickness; a gradually cooling furnace 57 gradually cooling the belt-shaped glass G conveyed from the float bath 53, and having a first gradually cooling chamber 55 and a second gradually cooling chamber 56 which reduce the generation of strain in the belt-shaped glass G as much as possible; a cutting table 58 for cutting the belt-shaped glass G conveyed from the gradually cooling furnace 57 into a predetermined size; and a pallet 59 for dividing and boxing the display glass 110 of fig. 1 manufactured as the cut plate glass. Since the strip-shaped glass G is shown by a solid line, the strip-shaped glass G is shown to flow in the direction of arrow a in the right direction of the figure at intervals on the molten metal layer 52 in the float bath of fig. 5, but actually flows in contact with the molten metal surface.

In this example, the glass-melting tank 51, the float bath 53, and the gradually cooling furnace 57 are installed in one building (hereinafter referred to as a first building 60) having an enclosed structure with respect to the outside air, and the cutting table 58 and the panel table 59 are also installed in one building (hereinafter referred to as a second building 61) having an enclosed structure. However, the specific design of the manufacturing apparatus such as which part is disposed in which building is not particularly limited.

The display glass 110 packed or loaded in a container on the pallet 59 is generally transported to another place, subjected to chamfering or polishing of the end surface 111, and assembled to the liquid crystal panel.

Fig. 6 is a conceptual view illustrating a manufacturing process of the float bath 53 and the inside of the second building 61, and fig. 7 is a cross-sectional view taken along line P-P of fig. 6. The molten ribbon glass G flowing out of the glass melting tank 51 into the float bath 53 is made to flow over the molten metal layer (molten tin or the like) 52 in the float bath 53 and is formed into a sheet-like ribbon glass G. The molten ribbon glass G is gradually cooled and hardened in the a direction (conveyance direction), and becomes a sheet-like ribbon glass G. The belt-like glass G is lifted up from the molten metal layer 52 in the downstream region, and is conveyed to the downstream cooling furnace 57 and the cutting table 58 by the rotation of the roller conveyor 12.

The float bath 53 includes a top roll 40 that applies tension in the width direction to the molten ribbon glass G on the molten metal layer 52. The ribbon glass G is processed to have a desired width and thickness by the action of the top roller 40. As shown in fig. 6, the top rollers 40 are used in pairs, and press both side edge portions of the molten ribbon glass G on the molten metal layer 52 to apply tension to the ribbon glass G in the width direction. The plurality of pairs of top rollers 40 are disposed at intervals along the flow direction of the ribbon glass G.

The top roller 40 has a rotating member that contacts the belt-shaped glass G at the leading end. The rotation of the rotating member causes the belt-shaped glass G to be fed in a predetermined direction. While the tension is applied by the plurality of pairs of top rollers 40, the ribbon glass G is gradually cooled and hardened while flowing in a predetermined direction.

By the drawing action of the top roll 40, both side edge portions (so-called ear portions) F having a large thickness are formed at both side edge portions F in the width direction (Y direction in fig. 6) of the ribbon glass G, and a predetermined rib-like pattern is naturally formed on the surfaces of both side edge portions F in the process of gradually cooling. Both side edge portions F are removed at any position and timing further downstream.

The belt-shaped glass G is further conveyed downstream by the roller conveyor 12, passes through the gradually cooling furnace 57, is conveyed to the cutting table 58 of the second building 61, and is cut by the cutting line processing device disposed at a predetermined position in the cutting table 58. Fig. 8 is a schematic perspective view of the cutting line processing device 80 provided on the cutting table 58. The cutting-line processing device 80 is a cutting-line processing device corresponding to a so-called different-size cutting method for processing a longitudinal cutting line and a transverse cutting line in the belt-shaped glass G continuously conveyed from the first building 60 by the roller conveyor 12, and is provided at least on the downstream side of the imaging devices 71 and 72 in fig. 6 and 7 to be described later. However, the cutting-line processing device 10 is not limited to cutting in different sizes.

The cutting line processing device 80 is composed of a longitudinal cutting line processing machine 14 provided on the upstream side in the conveyance direction of the belt-shaped glass G and a transverse cutting line processing machine 16 provided on the downstream side thereof. The longitudinal cutting line processing machine 14 processes a longitudinal cutting line (X direction in fig. 6) parallel to the conveyance direction of the belt-shaped glass G on the belt-shaped glass G, and the transverse cutting line processing machine 16 processes a transverse cutting line (Y direction in fig. 6) orthogonal to the conveyance direction of the belt-shaped glass on the belt-shaped glass G on the downstream side thereof.

The longitudinal cutting line processing machine 14 includes a plurality of cutting wheels 18, 18 … provided in the width direction of the ribbon glass G. The cutter wheels 18 and 18 … are moved forward and backward relative to the belt-shaped glass G being conveyed by the roller conveyor 12 by known forward and backward moving means, and are pressed against the belt-shaped glass G with a predetermined pressing force by the forward and backward movement. Thereby, a longitudinal cutting line parallel to the conveyance direction of the ribbon glass G is processed on the ribbon glass G.

The cutter wheel 18 is attached to a beam portion (guide frame) 26 via a feed unit 22 at a predetermined interval. The beam portion 26 is provided astride the roller conveyor 12 and is provided in a direction orthogonal to the conveyance direction of the belt-shaped glass G. The feeding unit 22 includes a fixing portion 30 movably fixed to two slits 28 formed to be elongated in the horizontal direction of the beam portion 26, and a support member 46 having one end fixed to the fixing portion 30 and the other end provided with the cutter wheel 18. Further, a ball screw device connected to the fixing portion 30 of the feeding unit 22 is provided in the hollow beam portion 26, and by driving the ball screw device, the fixing portion 30 moves in the horizontal slit 28 formed in the beam portion 26, and the support member 46 and the cutter wheel 18 slide in an interlocking manner. Thereby, the position of the cutter wheel 18 in the direction orthogonal to the conveyance direction of the belt-shaped glass G is adjusted.

On the other hand, the cross cutting line processing machine 16 includes a single cutting wheel 20, and the cutting wheel 20 moves obliquely in the Z direction which is an oblique direction with respect to the conveyance direction of the belt-shaped glass G in synchronization with the conveyance speed of the belt-shaped glass G, thereby processing the cross cutting line in the direction orthogonal to the conveyance direction of the belt-shaped glass G on the belt-shaped glass G.

A motor, not shown, for moving the cutter wheel 20 in an oblique direction is operated and controlled by a control device in synchronization with the conveyance speed of the belt-shaped glass G, and thereby a cross cutting line in a direction orthogonal to the conveyance direction of the belt-shaped glass G is formed on the belt-shaped glass G. The cutter wheel 20 is provided to be movable up and down with respect to the belt glass G by an actuator such as an air cylinder or a servo motor. With this actuator, the cutter wheel 20 starts to descend in advance at a position a predetermined amount before the cutting line machining start point in order to machine the cross cutting line having a good cutting depth. Thereafter, the cutter wheel 20 is moved diagonally along the guide frame 21 on the belt glass G by the driving force of the motor. Thereby, the cross cutting line is processed. After that, the cutter wheel 20 is moved upward from the belt glass G by the actuator after passing through the cutting line processing end point by a predetermined amount, and then returned to the original cutting line standby position by the motor.

As described above, the strip glass G is processed by the longitudinal cutting line and the transverse cutting line at the cutting table 58, and cut into the size of the display glass 110 shown in fig. 1 by the cutting device (see fig. 10) provided further downstream. In order to cut the display glass 110 to an accurate size, it is necessary to process the longitudinal cutting lines and the transverse cutting lines at accurate positions. Since the belt-shaped glass G is always moved in the conveyance direction (direction a) by the rotation of the roller conveyor 12, timing for joining the cutting line, i.e., the cross cutting line, in the conveyance direction is important, and it is necessary to accurately grasp the movement speed of the belt-shaped glass G in the conveyance direction and join the cross cutting line at accurate timing.

In the conventional technique described in patent document 2 and the like, the moving speed in the a direction is grasped using a member such as a predetermined roller that rotates in contact with the belt-shaped glass. However, in any of the rollers, the roller is deformed by factors such as thermal expansion, and it is difficult to maintain accurate detection of the moving speed.

In the method and apparatus for manufacturing a glass for display of the present embodiment, the moving speed of the ribbon glass G is detected using the both side edge portions F cut off at any timing shown in fig. 6 and 7. The rib-like patterns formed on the surfaces of both side edge portions F always vary, and the same pattern is not formed at a position of 2 or more. Then, as shown in fig. 6 and 7, at least 2 imaging devices 71 and 72 capable of imaging the pattern are provided inside the second building 61. The computer, not shown, takes in and holds the image captured by the first imaging device 71 on the upstream side. Then, the computer takes in and holds the image captured by the second imaging device 72 on the downstream side, compares the two images at a predetermined ratio, and compares whether or not the two images match. When the two images match, the computer can calculate the moving speed of the belt-shaped glass G from the timing of each image capturing 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 timing of cutting by the cross cutting machine 16 of the cutting line processing device 80 existing downstream of the imaging devices 71 and 72, and can transmit a drive signal at an appropriate timing to the cutting line processing device 80. As a result, the cross cutting line processing machine 16 can add the cross cutting line at an accurate position in the longitudinal direction (X direction in fig. 6) of the belt-shaped glass G. The positions of the imaging devices 71 and 72 are not particularly limited, and the imaging can be performed even inside the gradually cooling furnace 57, but is performed at least at positions (not shown) where both side edge portions F are cut off by the cutting table 58 and at positions upstream of the position of the cutting line processing device 80.

Fig. 9(a) shows an enlarged front view of the cutting wheel 20 of the cross cut line processor 16 or the cutting wheel 18 of the longitudinal cut line processor 14. The angle Φ between the surface of the ribbon glass G before cutting and the cutting wheel usually varies in the production of the glass sheet due to various factors such as the weight of the glass, the deflection of the conveying roller caused by the weight of the conveying roller, the thermal deformation of the conveying roller, the vibration of the apparatus, the deflection of the beam portion 26 and the guide frame 21, and does not fall within 90 degrees ± 1 degree. The present inventors have repeated experiments and found that the state of the end face obtained by the above-described method is deteriorated and cracks or fissures are likely to occur in the end face of the obtained glass for display. Therefore, in the present embodiment, the angle Φ is controlled to be within 90 degrees ± 1 degree. By such control, the cutting line L (the cross cutting line or the vertical cutting line) can be formed at an angle close to perpendicular to the surface of the ribbon glass G, and the end surface 111 of the display glass 110 can be formed appropriately. The angle phi is adjusted before the start of the operation of the manufacturing apparatus, but may be automatically controlled by monitoring the angle during the operation.

As shown in fig. 9(a), the cutting wheel 20 or the cutting wheel 18 forms a cross cutting line or a longitudinal cutting line, and oil such as lamp oil is continuously supplied from an oil supply device (not shown) provided adjacent thereto. The lamp oil enables the cutting wheel to smoothly run while forming the cutting line, and prevents the scattering of the cullet from the cutting line. As shown in FIG. 9(b), the oil supply device is arranged to supply oil to a region (0.5 mm. ltoreq.D) having a width within + -0.5 mm to + -1 mm with respect to the cutting line L₁≤1mm， 0.5mm≤D₂1mm or less) of the oil is supplied. By such control, the cutting line L can be smoothly formed.

Fig. 10 is a schematic view of a cutting device (glass breaking device) 90 disposed downstream of the cutting wire processing device 80 in fig. 8. The cutting device 90 includes a cutting roller 91 and a pressing roller 92, and the device shown here is a device that cuts the ribbon glass G along a cross cutting line and then cuts out the display glass 110. The cutting roller 91 is raised as indicated by an arrow B at the timing when the cutting line L (cross cutting line) arrives, and comes into contact with the lower surface of the belt-shaped glass G. On the other hand, the pressing roller 92 is lowered as indicated by an arrow C and brought into contact with the upper surface of the belt-shaped glass G at the timing when the cutting line L (the cross cutting line or the vertical cutting line) arrives. The cutting roller 91 and the pressing roller 92 press the ribbon glass G in the vertical direction, thereby cutting the ribbon glass G along the cutting line L.

Therefore, the timing of the rising of the cutting roller 91 and the falling of the pressing roller 92, particularly the timing of the rising of the cutting roller 91, is an important issue. In the present embodiment, the timing is controlled so that the cutting roller 91 is raised at a timing at which the cutting roller comes into contact with the surface of the belt-shaped glass G in the region W of ± 0.5mm to ± 1mm in the conveyance direction with respect to the cutting line L. This allows the cutting lines L to be smoothly formed, and the end surface 111 of the display glass 110 to be appropriately formed. For example, two imaging devices for imaging the cutting line L (cross cutting line) are disposed between the cutting line processing device 80 and the cutting device 90, and the computer can calculate the moving speed of the ribbon glass G, particularly the moving speed of the cutting line L, based on the timing and distance of each imaging. Based on the calculated moving speed, the computer can determine the timing of the rise of the cutting roller 91 and transmit a drive signal at an appropriate timing to the cutting device 90.

Fig. 11 shows a support member that supports the central region of the roller conveyor 12. The roller conveyor 12 has a predetermined length, and is bent even if made of a material having a predetermined rigidity, and the angle Φ may deviate from the range of 90 degrees ± 1 degree, thereby affecting the quality of the ribbon glass G and hence the display glass 110. In the present embodiment, the support member 43 for supporting the central region of the roller conveyor 12 is appropriately disposed to suppress the deflection of the roller conveyor 12. This can stabilize the quality of the ribbon glass G and the display glass 110.

As shown in fig. 11, the support member 43 includes a support rod 41 and a roller 42, and a concave portion 12a and a reduced diameter portion 12b are formed in the longitudinal center portion of the roller conveyor 12 by the surface depression of the roller conveyor 12. 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 a contact portion between the roller conveyor 12 and the support member 43 when viewed from the lateral direction in fig. 11, and the roller 42 of the support member 43 is in contact with the reduced diameter portion 12b of the roller conveyor 12 in a rotatable state and supports the reduced diameter portion 12b from below. This suppresses the bending of the roller conveyor 12, and prevents the quality of the ribbon glass G and thus the display glass 110 from being adversely affected by the support member 43. Fig. 12(b) shows an application form of fig. 12(a), and the reduced diameter portion 12b may be supported from below by a plurality of rollers 42 (two rollers in this example), thereby improving stability. In addition, a plurality of the support members 43 may be provided along the longitudinal direction of the roller conveyor 12.

Fig. 13 is a schematic view of a plate-like body packing box 301 for packing a plurality of laminated display glass 110, and fig. 13(a) shows a cross-sectional view of the whole and an enlarged view of a support portion. The plate-like body package box 301 is prepared on the pallet 59 or another table in the manufacturing apparatus shown in fig. 5, and the manufactured display glass 110 is placed thereon.

The plate-like body packing box 301 (hereinafter, also simply referred to as "packing box 301") according to the present embodiment accommodates a plurality of pieces (for example, 120 pieces) of display glass 110 in a substantially horizontally stacked state. When the display glass 110 is placed flat in the packing box, it is preferable to stack the display glass in a state where a thin mount sheet is sandwiched between plate-like bodies in order to avoid direct contact between the display glass and the mount sheet. The package box 301 includes a base 302, an upper cover 303 provided on the base, and a locking portion 304 provided on a side surface of the base. The packing box 301 is preferably rectangular in plan view in accordance with the shape of the display glass 110 to be housed.

The pedestal 302 of the present embodiment is provided with a bottom stack 306 on 1 side surface. When the display glass 110 is mounted on the base 302, the display glass 110 is generally mounted with the base 302 tilted, and at this time, the base 302 is tilted so that the surface on which the bottom shelf 306 is provided faces downward. The bottom stack 306 is a rectangular plate-shaped member and supports the bottom edge of the mounted display glass 110. From the viewpoint of ensuring the stability of the glass for display 110, it is preferable that a plurality of bottom stacks 306 are provided on 1 side surface of the pedestal, for example, 2 bottom stacks 306 are provided on 1 side surface of the pedestal 302.

Four columns 307 are provided at four corners of the pedestal 302. As shown in the enlarged view surrounded by the one-dot chain line in fig. 13, a support 309 having a trapezoidal cross section and a shape obtained by cutting off the top of a cone is formed at the top of the column 307, and another pedestal can be placed on the pedestal 302 via the support 309. As shown in the modification of fig. 13 b, the support portion 310 having a shape close to a pure cone (only the tip is a curved surface) may be used.

The upper cover 3 is a member having an open lower surface and surrounding the display glass 110 mounted thereon from above, and is detachable from the pedestal 302 disposed uppermost as shown in fig. 13.

The locking portion 304 is disposed on at least 2 side surfaces out of 4 side surfaces of the base 302 in order to stabilize the housed display glass 110, but is preferably disposed on 3 side surfaces. In the case of 3 side surfaces, the side surfaces are preferably arranged on 3 side surfaces other than the side surface on which the bottom stack 306 is provided. The locking portion 304 may be provided singly or in plural number on 1 side surface of the base 302, and for example, 1 or 2 may be provided on 1 side surface of the base 302.

The locking portion 304 may be made of a non-ferrous metal such as aluminum or a non-ferrous metal such as resin, as long as the strength for supporting the display glass 110 can be ensured. The shape is also not particularly limited, but may be, for example, an L-shape as shown in fig. 13.

Fig. 14 is a diagram showing a fixing structure when the locking portion 304 is disposed on the base 302.

In the present embodiment, at least 2 or more fixing pins 320 each including a shaft portion 321 and a head portion 322 having a larger diameter than the shaft portion are provided in the horizontal direction on the side surface of the base 302 on which the locking portion 304 is provided. In addition, at least 2 or more fixing grooves 323 for receiving the fixing pins 320 are provided in the locking portion 304 in the horizontal direction so as to correspond to the fixing pins 320. The fixing groove is an inverted F-shaped groove formed by a vertical portion 324 opened to the lower end of the locking portion 304 and 2 horizontal portions 325 formed continuously to the vertical portion 324, and the vertical portion 324 and the horizontal portions 325 are both wider than the shaft portion 321 of the fixing pin 320 and narrower than the head portion 322. In the present embodiment, 2 fixing pins 320 are provided in the vertical direction corresponding to 2 horizontal portions 325.

When the locking portion 304 is attached to the base 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, and the locking portion 304 is slid downward. After that, when the shaft portion 321 of the fixing pin 320 reaches the connecting portion between the vertical portion 324 and the horizontal portion 325 of the fixing groove 323, the locking portion 304 can be fixed to the base 302 by sliding the locking portion 304 in the horizontal direction so that the shaft portion 321 of the fixing pin 320 reaches the end of the horizontal portion 325 of the fixing groove 323 as shown in fig. 14 (b). Fig. 14 (c) is a diagram showing a state in which the locking portion 304 is fixed to the base 302.

In this way, the display glass 110 laminated on the base 302 is pressed against the base 302 with a constant force by the locking portion 304 provided on the base 302 so as not to vibrate during conveyance. As a result, even if an impact is applied from the outside during transportation of the packaging box, the packaging box itself vibrates during transportation, and the display glass 110 is held in a stable state. Further, it is preferable that a plate-like body (not shown) such as resin, corrugated paper, or wood be placed as a cushion material on the last plate-like body laid flat so as to avoid generation of flaws or dirt due to direct contact of the locking portion.

< example >

Hereinafter, examples of the present invention are shown in table 1, and comparative examples are shown in table 2. In tables 1 and 2 below, the "squareness" of parameter 1 corresponds to the inclination angle γ in fig. 2₁Angle of inclination gamma₂The "end face strength" of parameter 2 corresponds to the strength of the end face in fig. 3 and 4 in the 4-point bending test, the "unevenness of the end face" of parameter 3 corresponds to the maximum height Δ z in fig. 4, and the "angle of the end face" of parameter 4 corresponds to the inclination angle θ in fig. 3(c)₁Angle of inclination theta₂。

"the angle between the surface of the glass and the cutting wheel" in production condition 1 corresponds to the angle Φ between the surface of the glass and the cutting wheel in fig. 9(a), in "the method of breaking" in production condition 2, "imaging" corresponds to the method of controlling the raising of the cutting roller in fig. 10 using the imaging device, "the roller" corresponds to the method using the roller disclosed in patent document 2, and "the width of the lamp oil" in production condition 3 corresponds to the supply area D of the lamp oil in fig. 9(b)₁、D₂。

"load on glass" means the maximum load applied to glass when a container loaded with 100 or more pieces of glass having a size of 2500mm × 2800mm is driven at a speed of 40km to 100km for 1 hour or more. The case where one glass sheet loaded with such a load is not broken is represented by good, and the case where at least one glass sheet is broken is represented by x.

TABLE 1

TABLE 2