Methods for controlling longitudinal edge chipping of Mini LED backplate glass

Abstract

This invention discloses a method for controlling longitudinal edge bursting of Mini LED backplane glass, belonging to the field of glass production technology. The technical solution is as follows: 1) When longitudinal edge bursting occurs at the front of the glass plate, the felt of the third edge water jet is moved to the outer side, extending beyond the edge of the glass plate, and the felt of the second edge water jet is moved towards the edge of the glass plate, with a gap between them; if the outer side of the felt of the third edge water jet has already extended beyond the edge of the glass plate, the water flow rate of the third edge water jet is increased; 2) When longitudinal edge bursting occurs in the middle of the glass plate and the bursting edge is irregularly serrated, the water flow rate of the three edge water jets is increased; 3) When longitudinal edge bursting occurs in the middle of the glass plate and the bursting edge is fish-scale shaped, the felt of the first edge water jet is moved towards the extension line of the cutting path. This invention targets the cold-end cutting section in the float glass forming process, adjusting different process parameters according to different longitudinal edge bursting situations to reduce production losses caused by glass plate edge bursting.

Description

Technical Field

[0001] This invention relates to the field of glass production technology, specifically to a method for controlling longitudinal edge bursting of Mini LED backplate glass. Background Technology

[0002] Longitudinal edge bursting is a common problem in the cold-end cutting process of float glass. Real-time monitoring of the glass cutting process and equipment operation is necessary to avoid production issues and equipment malfunctions that could cause adverse effects. Longitudinal edge bursting mainly occurs during glass edge trimming. This is often caused by improper temperature control at the glass edge during annealing or inadequate cold-end edge water control, leading to unsatisfactory stress at the glass edge and resulting in edge bursting during cleaning. Longitudinal edge bursting typically manifests as fish-scale or serrated notches on the lower part of the glass plate. It can also be caused by improper tin bath adjustment, leading to edge bending and subsequent edge bursting. In the production of Mini LED backplane glass, the edge thickness is greater than the overall glass thickness, making cooling more difficult and increasing the likelihood of longitudinal edge bursting.

[0003] When glass sheets experience edge chipping, it directly impacts the glass cutting rate, as chipped glass is typically defective. If glass is already on the stacking rack, it needs to be repacked, and the chipped defective pieces manually removed. During this process, the robotic arm must be controlled to release the chipped glass from the stacking rack to a flotation table for unified processing. After all chipped glass is removed, parameters need to be adjusted for continued processing. The repacking process also carries a high risk of collisions and scratches, further increasing product quality losses. Therefore, when glass sheets experience edge chipping, cold-end personnel must promptly detect and prevent it, or quickly implement emergency measures to minimize losses.

[0004] In summary, the edge temperature of the glass plate needs to be adjusted appropriately according to the severity of the edge breakage to obtain an ideal stress distribution, thereby avoiding edge breakage. Summary of the Invention

[0005] The technical problem to be solved by this invention is to overcome the shortcomings of the prior art and provide a method for controlling longitudinal edge bursting of Mini LED backplate glass. For the cold end cutting section in the float glass process, different process parameters are adjusted according to different longitudinal edge bursting situations to reduce the production loss caused by glass edge bursting.

[0006] The technical solution of this invention is as follows:

[0007] The method for controlling longitudinal edge bursting of Mini LED back panel glass is as follows: three edge water channels are symmetrically set on both sides of the glass plate between the annealing furnace outlet and the longitudinal cutting knife. Along the moving direction of the glass plate, the three edge water channels are the first edge water channel, the second edge water channel and the third edge water channel.

[0008] 1) When longitudinal edge bursting occurs in front of the glass plate

[0009] Move the felt of the third edge water flow to the outside, beyond the edge of the glass plate, and move the felt of the second edge water flow towards the edge of the glass plate with a gap between it and the edge of the glass plate; if the outer side of the felt of the third edge water flow has already exceeded the edge of the glass plate, then increase the water flow rate of the third edge water flow.

[0010] 2) When longitudinal edge bursting occurs in the middle of the glass plate and the edge bursting is irregularly serrated, increase the water flow rate of the three edge water channels;

[0011] 3) When longitudinal edge bursting occurs in the middle of the glass plate and the edge bursting is fish scale-like, move the felt of the first edge water towards the extension line of the knife path.

[0012] Preferably, in step 1), the felt of the third edge water is adjusted to extend 3-10mm beyond the edge of the glass plate, and the distance adjustment of the felt of the second edge water is half that of the distance adjustment of the third edge water.

[0013] Preferably, in step 1), the water flow increment of the third edge water (mL / min) = original edge water flow (mL / min) × edge burst length (mm) × width at the widest point of the edge burst (mm) × glass plate edge thickness (mm) ÷ glass plate pulling speed (m / h) × 0.63.

[0014] Preferably, while adjusting the flow rate of the third side water, the felt of the first side water is moved towards the edge of the glass plate, and the distance moved (mm) = [the increase in the flow rate of the third side water (mL / min) ÷ the original flow rate of the side water (mL / min)] × 105.

[0015] Preferably, in step 2), the water flow increment of the three edge waters is as follows: the water flow increment of the first edge water (mL / min) = original edge water flow (mL / min) × width of the widest point of the burst edge (mm) × thickness of the glass plate edge (mm) ÷ glass plate pulling speed (m / h) × 6.5; the water flow increment of the second edge water = original edge water flow (mL / min) × width of the widest point of the burst edge (mm) × thickness of the glass plate edge (mm) ÷ glass plate pulling speed (m / h) × 7.3; the water flow increment of the third edge water (mL / min) = original edge water flow (mL / min) × width of the widest point of the burst edge (mm) × thickness of the glass plate edge (mm) ÷ glass plate pulling speed (m / h) × 7.

[0016] Preferably, in step 3), the adjustment amount of the felt distance of the first edge water (mm) = total edge burst length (mm) × glass plate edge thickness (mm) ÷ glass plate pulling speed (m / h) × edge water flow rate (mL / min) × 9.3.

[0017] Preferably, when moving the felt of the first edge water treatment, the distance between the felt and the extension line of the knife path should be greater than 10mm.

[0018] Compared with the prior art, the present invention has the following advantages:

[0019] This invention addresses the cold-end cutting section in the float glass manufacturing process by adjusting different process parameters according to varying longitudinal edge bursting conditions, thereby reducing production losses caused by glass edge bursting. Attached Figure Description

[0020] Figure 1 This is a schematic diagram showing the positions of the three side water features of the present invention.

[0021] Figure 2 This is a schematic diagram showing the position of the three edge water-retaining felts on the edge of the glass plate of the present invention.

[0022] Figure 3 This is a schematic diagram of a longitudinal edge burst occurring at the front of the glass plate.

[0023] Figure 4 This is a schematic diagram showing an irregular serrated shape at the bottom when a glass plate experiences longitudinal edge chipping.

[0024] Figure 5 This is a schematic diagram showing the fish-scale pattern at the bottom when a glass plate experiences longitudinal edge chipping.

[0025] In the diagram, 1 is the edge of the glass plate; 2 is the first edge water level; 3 is the second edge water level; 4 is the third edge water level; 5 is the support; 6 is the water pipe; and 7 is the felt. Detailed Implementation

[0026] To enable those skilled in the art to better understand the technical solutions of this invention, the technical solutions of this invention will be clearly and completely described below in conjunction with the embodiments of this invention.

[0027] like Figure 1 As shown, after the Mini LED backplate glass is annealed in an annealing furnace, it needs to be longitudinally cut. Before this, three symmetrical edge water channels are set on both sides of the glass plate between the annealing furnace outlet and the longitudinal cutting blade to cool the edge 1 of the glass plate. The spacing between adjacent edge water channels is 5m. For ease of description, along the direction of glass plate movement, the three edge water channels are named first edge water channel 2, second edge water channel 3, and third edge water channel 4. Among them, the edge water channel is a commonly used device in existing glass production. Its structure is as follows: a water pipe 6 is set on a support 5. The outlet of the water pipe 6 is 8cm away from the upper surface of the glass plate. A flow meter and valve are set on the water pipe 6 to monitor and regulate the water flow. A 5cm wide felt 7 is set at the outlet of the water pipe 6. The felt 7 is placed on the upper surface of the glass plate to evenly coat the glass plate with water.

[0028] Example 1

[0029] In this embodiment, during the production process of Mini LED backplane glass, such as... Figure 3 As shown, a longitudinal edge burst appears in front of the glass plate. This phenomenon is generally caused by improper positioning of the edge water sealant. To address this, the control method is as follows: move the felt 7 of the third edge water sealant 4 to a position 4mm beyond the edge of the glass plate, and move the felt 7 of the second edge water sealant 3 towards the edge of the glass plate by half the moving distance of the third edge water sealant 4. A gap should exist between the second edge water sealant 3 and the edge of the glass plate, ensuring that the relative positions of the three edge water sealants remain as shown. Figure 2 The connection is as shown.

[0030] If, before adjustment, the outer edge of the felt 7 of the third edge water 4 extends beyond the edge of the glass plate, then the water flow rate of the third edge water 4 needs to be increased. The adjustment amount is calculated using the following formula: Increment of water flow rate of the third edge water 4 (mL / min) = Original edge water flow rate (mL / min) × Edge burst length (mm) × Width of the widest point of the edge burst (mm) × Thickness of glass plate edge 1 (mm) ÷ Glass plate pulling speed (m / h) × 0.63. In this embodiment, the original edge water flow rate = 15 mL / min, the edge burst length = 20 mm, the width of the widest point of the edge burst = 5 mm, the thickness of glass plate edge 1 = 1 mm, and the glass plate pulling speed = 600 m / h. Therefore, the calculated increment of water flow rate of the third edge water 4 = 1.575 mL / min, that is, the adjusted water flow rate of the third edge water 4 is 16.575 mL / min. After adjustment, the longitudinal edge bursting phenomenon in front of the glass plate disappears, indicating that the longitudinal edge bursting phenomenon of the glass plate in this embodiment has been eliminated.

[0031] In addition, while adjusting the flow rate of the third edge water 4, the felt 7 of the first edge water 2 can be moved towards the edge of the glass plate. The distance moved (mm) = [the increase in the flow rate of the third edge water 4 (mL / min) ÷ the original edge water flow rate (mL / min)] × 105 = 11mm. Moving the first edge water 2 towards the edge of the glass plate while adjusting the flow rate of the third edge water 4 is to appropriately reduce the temperature drop at the edge 1 of the glass plate, thereby preventing the glass from developing a blade edge or failing to follow a cutting path due to excessively low edge temperature.

[0032] Example 2

[0033] In this embodiment, during the production process of Mini LED backplane glass, such as... Figure 4 As shown, longitudinal edge chipping occurred in the middle of the glass plate, and the chipping was irregularly serrated. This phenomenon was caused by the higher temperature of edge 1 of the glass plate, which could not form an appropriate temperature difference with the inner part of the knife path extension line, resulting in an unreasonable stress distribution on the surface of the glass plate. At this time, it is necessary to increase the water flow rate of the three edge water channels, and the increase in the water flow rate of the three edge water channels is:

[0034] The water flow increment of the first edge water 2 (mL / min) = original edge water flow (mL / min) × width of the widest point of the burst edge (mm) × thickness of glass plate edge 1 (mm) ÷ glass plate pulling speed (m / h) × 8.5; the water flow increment of the second edge water 3 = original edge water flow (mL / min) × width of the widest point of the burst edge (mm) × thickness of glass plate edge 1 (mm) ÷ glass plate pulling speed (m / h) × 7.3; the water flow increment of the third edge water 4 (mL / min) = original edge water flow (mL / min) × width of the widest point of the burst edge (mm) × thickness of glass plate edge 1 (mm) ÷ glass plate pulling speed (m / h) × 7.

[0035] In this embodiment, the original flow rate of the first edge water 2 is 10 mL / min, the original flow rate of the second edge water 3 is 12 mL / min, and the original flow rate of the third edge water 4 is 15 mL / min. The width at the widest point of the edge breakage is 5 mm, the thickness of the glass plate edge 1 is 1 mm, and the glass plate pulling speed is 600 m / h. Therefore, the calculated flow rate increments for the three edge water tiers are: 0.7 mL / min for the first edge water 2, 0.73 mL / min for the second edge water 3, and 0.875 mL / min for the third edge water 4. After adjustment, the longitudinal edge breakage phenomenon in the middle of the glass plate disappeared, indicating that the longitudinal edge breakage phenomenon of the glass plate in this embodiment was eliminated.

[0036] Example 3

[0037] In this embodiment, during the production process of Mini LED backplane glass, such as... Figure 5 As shown, longitudinal edge bursting occurred in the middle of the glass plate, and the bursting edge was fish-scale shaped. This phenomenon was caused by the insufficient flow rate of the first edge water purifier 2. The felt 7 of the first edge water purifier 2 should be moved in the direction of the extension line of the knife path. When moving, the moving distance of the felt 7 of the first edge water purifier 2 is calculated by the following formula: the adjustment amount of the felt 7 of the first edge water purifier 2 (mm) = total length of bursting edge (mm) × thickness of glass plate edge 1 (mm) ÷ glass plate pulling speed (m / h) × edge water flow rate (mL / min) × 9.3.

[0038] In this embodiment, the total length of the edge burst is 100mm, the thickness of the glass plate edge 1 is 1mm, and the glass plate pulling speed is...

[0039] =600m / h, side water flow rate =10mL / min, thus the moving distance of the felt 7 of the first side water 2 is calculated to be 15.5mm.

[0040] At the same time, when moving the felt 7 of the first edge water 2, it is also necessary to ensure that the distance between the felt 7 and the extension line of the blade path is greater than 10mm. This is to ensure that there are no edge water marks in the extension line of the blade path, thereby ensuring the quality of the board surface. When the blade wheel rubs against the edge water marks, it will also have an adverse effect on the life of the blade wheel.

Claims

1. A method for controlling longitudinal edge chipping of Mini LED backplate glass, characterized in that, Between the annealing furnace outlet and the longitudinal cutting knife, three edge water channels are symmetrically arranged on both sides of the glass plate. Along the direction of glass plate movement, the three edge water channels are the first edge water channel (2), the second edge water channel (3), and the third edge water channel (4). 1) When the longitudinal edge burst occurs in front of the glass plate, move the felt (7) of the third edge water (4) to the outside beyond the edge of the glass plate, and move the felt (7) of the second edge water (3) to the edge of the glass plate with a gap between it and the edge of the glass plate; if the felt (7) of the third edge water (4) has already exceeded the edge of the glass plate, increase the water flow of the third edge water (4); 2) When longitudinal edge bursting occurs in the middle of the glass plate and the bursting edge is irregularly serrated, increase the water flow rate of the three edge water channels; 3) When the longitudinal edge burst occurs in the middle of the glass plate and the edge burst is fish scale-like, move the felt (7) of the first edge water (2) towards the extension line of the knife path.

2. The method for controlling longitudinal edge bursting of Mini LED backplate glass as described in claim 1, characterized in that, In step 1), the felt (7) of the third edge water (4) is adjusted to extend 3-10mm beyond the edge of the glass plate on the outside. The distance adjustment of the felt (7) of the second edge water (3) is half the distance adjustment of the third edge water (4).

3. The method for controlling longitudinal edge bursting of Mini LED backplate glass as described in claim 1, characterized in that, In step 1), the water flow increment of the third edge water (4) (mL / min) = original edge water flow (mL / min) × edge burst length (mm) × width at the widest point of the edge burst (mm) × thickness of the glass plate edge (1) (mm) ÷ glass plate pulling speed (m / h) × 0.

63.

4. The method for controlling longitudinal edge bursting of Mini LED backplate glass as described in claim 3, characterized in that, While adjusting the flow rate of the third side water (4), the felt (7) of the first side water (2) is moved toward the edge of the glass plate. The distance moved (mm) = [the increase in the flow rate of the third side water (4) (mL / min) ÷ the original flow rate of the side water (mL / min)] × 105.

5. The method for controlling longitudinal edge bursting of Mini LED backplate glass as described in claim 1, characterized in that, In step 2), the water flow increment of the three side waters is as follows: the water flow increment of the first side water (2) (mL / min) = original side water flow (mL / min) × width of the widest point of the burst edge (mm) × thickness of the glass plate edge (1) (mm) ÷ glass plate pulling speed (m / h) × 6.5; the water flow increment of the second side water (3) = original side water flow (mL / min) × width of the widest point of the burst edge (mm) × thickness of the glass plate edge (1) (mm) ÷ glass plate pulling speed (m / h) × 7.3; the water flow increment of the third side water (4) (mL / min) = original side water flow (mL / min) × width of the widest point of the burst edge (mm) × thickness of the glass plate edge (1) (mm) ÷ glass plate pulling speed (m / h) × 7.

6. The method for controlling longitudinal edge bursting of Mini LED backplate glass as described in claim 1, characterized in that, In step 3), the distance adjustment amount (mm) of the felt (7) of the first edge water (2) = total edge length (mm) × thickness of glass plate edge (1) (mm) ÷ glass plate pulling speed (m / h) × edge water flow rate (mL / min) × 9.

3.

7. The method for controlling longitudinal edge bursting of Mini LED backplate glass as described in claim 6, characterized in that, When moving the felt (7) of the first edge water (2), ensure that the distance between the felt (7) and the extension line of the knife path is >10mm.

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