Production process of low radiation bending toughened glass
By controlling the speed and using air-cooling lag treatment during the heating process of low-emissivity glass, the problems of coating peeling and cracking during the bending tempering process of low-emissivity glass have been solved, enabling the production of high-quality low-emissivity bending tempered glass suitable for buildings with special shapes.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- JIANGSU JINQIAO GLASS TECH CO LTD
- Filing Date
- 2023-07-21
- Publication Date
- 2026-05-19
AI Technical Summary
Existing technologies are prone to coating peeling, edge curling, and cracking during the bending and tempering process of low-emissivity glass, resulting in a low pass rate and difficulty in meeting the needs of buildings with special shapes.
Low-emissivity glass is used to oscillate at different speeds during the heating process, with five speed control segments. Heating temperature and time are optimized, and a cooling lag time is set after arcing. Rapid cooling and cooling air pressure are also controlled to ensure the stability of the coating layer and uniform heating of the glass.
It improves the heat uniformity and mechanical strength of low-emissivity bending tempered glass, avoids the performance impact of the coating layer and the edge curling and cracking of the glass, and improves optical and thermal insulation performance.
Smart Images
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Abstract
Description
Technical Field
[0001] This invention relates to the field of glass technology, particularly to the field of IPC C03B27, and further to a production process for low-emissivity curved tempered glass. Background Technology
[0002] Low-emissivity (LEE) glass has broad application prospects due to its excellent decorative properties, sun shading and heat insulation, noise reduction, and environmental friendliness. As people's material lives become increasingly affluent and their aesthetic standards rise, higher demands are being placed on architectural design. To make specially shaped buildings more aesthetically pleasing and smooth, flat tempered LEE glass is clearly insufficient. However, curved tempered glass is prone to cracking and has a low pass rate.
[0003] Chinese patent CN 202010005878 discloses a tempering process for large-arc tempered glass, including the following steps: S1: providing a flat glass substrate; S2: cutting the flat glass substrate according to a preset size; S3: washing and polishing the cut flat glass substrate; S4: sending the washed and polished flat glass substrate into the heating section of a horizontal tempering furnace for heating treatment; S5: sending the heated flat glass substrate into the cooling section of the horizontal tempering furnace, adjusting the distance between the air nozzles in the cooling section and the corresponding surface of the flat glass substrate so that the air nozzles are arranged according to the preset arc shape, and after the flat glass substrate is cooled by air blowing from the air nozzles, large-arc tempered glass is obtained. However, this technical solution is aimed at ordinary glass, while low-emissivity glass, due to its special coating layer, may experience peeling and edge curling during the tempering process, affecting its optical and mechanical strength. Summary of the Invention
[0004] The first aspect of this invention provides a manufacturing process for low-emissivity curved tempered glass, comprising the following steps:
[0005] S1. A low-emissivity glass that has undergone cutting and polishing;
[0006] S2. The low-emissivity glass obtained in S1 is sent into a tempering furnace for heat treatment.
[0007] S3. The low-emissivity glass obtained in S2 is subjected to arc forming process;
[0008] S4. Rapidly cool the low-emissivity glass obtained in S3.
[0009] S5. Cool the low-emissivity glass obtained in S4.
[0010] S6. The low-emissivity glass obtained in S5 is sent out of the tempering furnace for arc-dropping and sheet production, thus obtaining the final product.
[0011] In some preferred embodiments, the heat treatment process employs a double-sided heating method to heat both the coated and uncoated surfaces simultaneously.
[0012] In some preferred embodiments, the temperature at which the coated surface is heated is 685–695°C.
[0013] In some preferred embodiments, the temperature at which the uncoated surface is heated is 680–690°C.
[0014] In some preferred embodiments, the heat treatment time is 320–360 s.
[0015] In some preferred embodiments, the heating power of the heat treatment is 460-480KW.
[0016] In some preferred embodiments, the low-emissivity glass oscillates at different speeds during the heat treatment process.
[0017] In some preferred embodiments, the oscillation speed is divided into at least five segments based on the average heating treatment time; the first segment speed is 45-55 mm / s; the second segment speed is 85-95 mm / s; the third segment speed is 135-145 mm / s; the fourth segment speed is 175-185 mm / s; and the fifth segment speed is 215-225 mm / s.
[0018] Generally, to ensure uniform heating of low-emissivity glass, a zoned heating method is often used. However, zoned heating inevitably leads to problems such as long heating times and complex processes. Through extensive experimental research, the applicant unexpectedly discovered that when the low-emissivity glass is oscillated at different speeds during the heating process, especially when the oscillation speed is divided into at least five segments based on the average heating time: the first segment speed is 45–55 mm / s; the second segment speed is 85–95 mm / s; the third segment speed is 135–145 mm / s; the fourth segment speed is 175–185 mm / s; and the fifth segment speed is 215–225 mm / s, not only can the drawbacks of zoned heating be solved, but uniform heating of the low-emissivity glass can also be achieved. This improves the flatness of the low-emissivity glass while preventing the performance of the coating layer from being affected.
[0019] In some preferred embodiments, the arc forming speed is 270–360 mm / s.
[0020] In some preferred embodiments, the distance of the arc forming process (the distance from the heating treatment position to the arc forming treatment position) is 790-810 mm.
[0021] In some preferred embodiments, both the rapid cooling treatment and the cooling treatment are air-cooled treatments.
[0022] In some preferred embodiments, a cooling lag time is set before the rapid cooling process and after the arc forming process.
[0023] In some preferred embodiments, the air-cooling lag time is 2 to 4 seconds.
[0024] In some preferred embodiments, the rapid cooling process takes 75 to 85 seconds and the rapid cooling air pressure is 3300 to 3400 MPa.
[0025] Generally, rapid quenching is used to improve the mechanical strength of glass. However, during experiments, the applicant discovered that when a short quenching time of 75-85 seconds is used, the resulting low-emissivity curved tempered glass is prone to cracking, affecting its optical properties and thermal insulation performance. To solve this technical problem, the applicant, through extensive experimental research, discovered that setting a cooling lag time after the arc forming process, especially when the cooling lag time is 2-4 seconds and the quenching air pressure is controlled at 3300-3400 MPa, can achieve the excellent mechanical properties of low-emissivity curved tempered glass obtained from a shorter quenching time, while avoiding cracking and preserving its optical properties and thermal insulation performance. The applicant speculates that the technical solution of this application targets low-emissivity glass with a coating layer and performs an arc-shaped treatment on it. Although this application achieves uniform heating by oscillating the low-emissivity glass at different speeds during the heat treatment process, the presence of the coating layer inevitably affects the balance between internal tensile stress and surface compressive stress. When rapid cooling is directly applied, it will lead to further imbalance between tensile and compressive stress, resulting in glass cracking / breakage. The technical solution of this application can act as a buffer, preventing the balance between tensile and compressive stress from being broken, while also improving the surface stress and mechanical strength of the low-emissivity glass. The resulting low-emissivity curved tempered glass can be applied to curtain walls, stadiums, canopies, and residences with special shapes.
[0026] In some preferred embodiments, the oscillation speed of the upper and lower air grilles during the rapid cooling process is 190–210 mm / s.
[0027] In some preferred embodiments, the cooling process takes 75 to 85 seconds and the cooling air pressure is 2100 to 2300 MPa.
[0028] In some preferred embodiments, the oscillation speed of the upper and lower air grilles during the cooling process is 90–110 mm / s.
[0029] During the experiment, the applicant further discovered that when the low-emissivity glass is rapidly cooled for 75-85 seconds and then cooled for another 75-85 seconds at a cooling air pressure of 2100-2300 MPa, not only is the surface stress of the low-emissivity glass more uniform, but the edge warping problem of the low-emissivity glass after the arc forming process can also be reduced.
[0030] In some preferred embodiments, the low-emissivity glass is fed into the tempering furnace at a speed of 490–510 mm / s.
[0031] In some preferred embodiments, the low-emissivity glass is fed out of the tempering furnace at a speed of 590–610 mm / s.
[0032] In some preferred embodiments, the low-emissivity glass is 40-45 mm above the upper windshield.
[0033] In some preferred embodiments, the low-emissivity glass is 40-45 mm above the lower windshield.
[0034] In some preferred embodiments, the thickness of the low-emissivity glass is 6 mm.
[0035] Beneficial effects:
[0036] 1. In this application, the low-emissivity glass is oscillated at different speeds during the heat treatment process. In particular, the oscillation speed is divided into at least five segments based on the average heat treatment time. The first segment speed is 45-55 mm / s; the second segment speed is 85-95 mm / s; the third segment speed is 135-145 mm / s; the fourth segment speed is 175-185 mm / s; and the fifth segment speed is 215-225 mm / s. This not only solves the shortcomings of zoned heating but also achieves uniform heating of the low-emissivity glass. This improves the flatness of the low-emissivity glass while avoiding affecting the performance of the coating layer of the low-emissivity glass.
[0037] 2. This application sets a cooling lag time before the rapid cooling treatment and after the arc forming treatment. In particular, when the cooling lag time is 2 to 4 seconds and the rapid cooling air pressure is controlled at 3300 to 3400 MPa, it can achieve the excellent mechanical properties of low-emissivity curved tempered glass brought about by a shorter rapid cooling treatment time, and can also avoid cracks in the low-emissivity curved tempered glass without affecting the optical performance and heat insulation and heat preservation performance of the low-emissivity curved tempered glass.
[0038] 3. When this application employs a rapid cooling treatment of 75-85 seconds followed by a cooling air pressure of 2100-2300 MPa for 75-85 seconds, it not only makes the surface stress of the low-emissivity glass more uniform, but also reduces the edge warping problem of the low-emissivity glass after the arc forming process.
[0039] 4. The application controls the arc forming speed to be 270-360 mm / s, which can further prevent the low-emissivity glass from cracking after arc forming, thus affecting its optical performance and heat insulation and heat preservation performance.
[0040] 5. This application controls the height of the low-emissivity glass from the upper air grille to be 40-45 mm, the height from the lower air grille to be 40-45 mm, and the oscillation speed of the upper and lower air grilles during the rapid cooling process to be 190-210 mm / s; the oscillation speed of the upper and lower air grilles during the cooling process to be 90-110 mm / s. This not only avoids pitting on the surface of the low-emissivity glass but also improves the impact resistance of the low-emissivity curved tempered glass. Attached Figure Description
[0041] Figures 1-3 The image shows a physical picture of low-emissivity curved tempered glass obtained using the production process of low-emissivity curved tempered glass in Example 1. Detailed Implementation
[0042] Example 1
[0043] Example 1 provides a manufacturing process for low-emissivity curved tempered glass, including the following steps:
[0044] S1. A low-emissivity glass that has undergone cutting and polishing;
[0045] S2. The low-emissivity glass obtained in S1 is sent into a tempering furnace for heat treatment.
[0046] S3. The low-emissivity glass obtained in S2 is subjected to arc forming process;
[0047] S4. Rapidly cool the low-emissivity glass obtained in S3.
[0048] S5. Cool the low-emissivity glass obtained in S4.
[0049] S6. The low-emissivity glass obtained in S5 is sent out of the tempering furnace for arc-dropping and sheet production, thus obtaining the final product.
[0050] The low-emissivity glass was purchased from Xinyi Glass Holdings Limited, model number: XDTB 0170.
[0051] The heat treatment process employs a double-sided heating method to heat both the coated and uncoated surfaces simultaneously.
[0052] The temperature at which the coated surface is heated is 690°C.
[0053] The temperature at which the uncoated surface is heated is 685°C.
[0054] The heat treatment time is 340 seconds.
[0055] The heating power of the heat treatment is 475KW.
[0056] During the heat treatment process, the low-emissivity glass oscillates at different speeds.
[0057] The oscillation speed is divided into five segments based on the average heating treatment time: the first segment speed is 50 mm / s; the second segment speed is 90 mm / s; the third segment speed is 140 mm / s; the fourth segment speed is 180 mm / s; and the fifth segment speed is 220 mm / s.
[0058] The arc-forming process is performed at a speed of 300 mm / s.
[0059] The distance for the arc forming process is 800mm.
[0060] Both the rapid cooling treatment and the cooling treatment are air-cooled treatments.
[0061] Before the rapid cooling process, a cooling lag time is set after the arc forming process.
[0062] The air-cooling lag time is 3 seconds.
[0063] The rapid cooling process lasts for 80 seconds, and the rapid cooling air pressure is 3350 MPa.
[0064] The oscillation speed of the upper and lower air grilles during the rapid cooling process is 200 mm / s.
[0065] The cooling process takes 80 seconds and the cooling air pressure is 2200 MPa.
[0066] The oscillation speed of the upper and lower air grilles during the cooling process is 100 mm / s.
[0067] The low-emissivity glass is fed into the tempering furnace at a speed of 500 mm / s.
[0068] The low-emissivity glass is fed out of the tempering furnace at a speed of 600 mm / s.
[0069] The low-emissivity glass is 42mm above the upper windshield.
[0070] The low-emissivity glass is 42mm above the lower windshield.
[0071] The thickness of the low-emissivity glass is 6 mm.
[0072] Example 2
[0073] Example 2 provides a manufacturing process for low-emissivity curved tempered glass, including the following steps:
[0074] S1. A low-emissivity glass that has undergone cutting and polishing;
[0075] S2. The low-emissivity glass obtained in S1 is sent into a tempering furnace for heat treatment.
[0076] S3. The low-emissivity glass obtained in S2 is subjected to arc forming process;
[0077] S4. Rapidly cool the low-emissivity glass obtained in S3.
[0078] S5. Cool the low-emissivity glass obtained in S4.
[0079] S6. The low-emissivity glass obtained in S5 is sent out of the tempering furnace for arc-dropping and sheet production, thus obtaining the final product.
[0080] The low-emissivity glass was purchased from Xinyi Glass Holdings Limited, model number: XDTB 0170.
[0081] The heat treatment process employs a double-sided heating method to heat both the coated and uncoated surfaces simultaneously.
[0082] The temperature at which the coated surface is heated is 690°C.
[0083] The temperature at which the uncoated surface is heated is 685°C.
[0084] The heat treatment time is 360 seconds.
[0085] The heating power of the heat treatment is 475KW.
[0086] During the heat treatment process, the low-emissivity glass oscillates at different speeds.
[0087] The oscillation speed is divided into five segments based on the average heating treatment time: the first segment speed is 50 mm / s; the second segment speed is 90 mm / s; the third segment speed is 140 mm / s; the fourth segment speed is 180 mm / s; and the fifth segment speed is 220 mm / s.
[0088] The arc forming speed is 320 mm / s.
[0089] The distance for the arc forming process is 800mm.
[0090] Both the rapid cooling treatment and the cooling treatment are air-cooled treatments.
[0091] Before the rapid cooling process, a cooling lag time is set after the arc forming process.
[0092] The air-cooling lag time is 3 seconds.
[0093] The rapid cooling process lasts for 80 seconds, and the rapid cooling air pressure is 3350 MPa.
[0094] The oscillation speed of the upper and lower air grilles during the rapid cooling process is 200 mm / s.
[0095] The cooling process takes 80 seconds and the cooling air pressure is 2200 MPa.
[0096] The oscillation speed of the upper and lower air grilles during the cooling process is 100 mm / s.
[0097] The low-emissivity glass is fed into the tempering furnace at a speed of 500 mm / s.
[0098] The low-emissivity glass is fed out of the tempering furnace at a speed of 600 mm / s.
[0099] The low-emissivity glass is 42mm above the upper windshield.
[0100] The low-emissivity glass is 42mm above the lower windshield.
[0101] The thickness of the low-emissivity glass is 6 mm.
[0102] Comparative Example 1
[0103] Comparative Example 1 provides a production process for low-emissivity curved tempered glass, the specific implementation of which is the same as that of Example 1, except that the oscillation speed is divided into four segments according to the heating treatment time; the first segment speed is 90 mm / s; the second segment speed is 140 mm / s; the third segment speed is 180 mm / s; and the fourth segment speed is 220 mm / s.
[0104] Comparative Example 2
[0105] Comparative Example 2 provides a production process for low-emissivity curved tempered glass, the specific implementation of which is the same as that of Example 1, except that no air cooling lag time is set.
[0106] Comparative Example 3
[0107] Comparative Example 3 provides a production process for low-emissivity curved tempered glass, the specific implementation of which is the same as that of Example 1, except that the air cooling lag time is 5s and the rapid cooling air pressure is 3500MPa.
[0108] Performance testing: The low-emissivity curved tempered glass obtained using the production processes of Examples 1-2 and Comparative Examples 1-3 was subjected to the following performance tests:
[0109] 1. Light transmittance and shading coefficient: measured using a spectrophotometer.
[0110] 2. Heat transfer coefficient: Refer to standard T / CECS 627-2019.
[0111] 3. Impact resistance, bending resistance, surface stress, and fragmentation: Refer to standard GB 15763.2-2005.
[0112] 4. Yield: 100 pieces of low-emissivity curved tempered glass were produced using the production processes of Examples 1-2 and Comparative Examples 1-3;
[0113] Test results:
[0114] The test data in this application is from May. During the experiment, the applicant found that the data obtained from testing the low-emissivity bending tempered glass produced using the production process of this application from May to October were basically consistent with the data from May. In November and December, and from January to April, the heating treatment time needs to be increased and the quenching air pressure and cooling air pressure need to be reduced. The heating treatment time needs to be increased by 5-10% and the quenching air pressure and cooling air pressure need to be reduced by 10%.
[0115]
[0116]
Claims
1. A manufacturing process for low-emissivity curved tempered glass, characterized in that, Includes the following steps: S1. A low-emissivity glass that has undergone cutting and polishing; S2. The low-emissivity glass obtained in S1 is sent into a tempering furnace for heat treatment. S3. The low-emissivity glass obtained in S2 is subjected to arc forming process; S4. Rapidly cool the low-emissivity glass obtained in S3. S5. Cool the low-emissivity glass obtained in S4. S6. Send the low-emissivity glass obtained in S5 out of the tempering furnace for arc-drop extrusion, and the glass is obtained. During the heat treatment process, the low-emissivity glass oscillates at different speeds, and the oscillation speed is divided into at least five segments based on the average heat treatment time: the first segment speed is 45~55 mm / s; the second segment speed is 85~95 mm / s; the third segment speed is 135~145 mm / s; the fourth segment speed is 175~185 mm / s; and the fifth segment speed is 215~225 mm / s. Before the rapid cooling process, after the arc forming process, a cooling lag time is set, which is 2-4 seconds. The rapid cooling process takes 75-85 seconds and the rapid cooling air pressure is 3300-3400 MPa. The cooling process takes 75-85 seconds and the cooling air pressure is 2100-2300 MPa.
2. The production process of low-emissivity curved tempered glass according to claim 1, characterized in that, The arc forming speed is 270~360mm / s.
3. The production process of low-emissivity curved tempered glass according to claim 1, characterized in that, Both the rapid cooling treatment and the cooling treatment are air-cooled treatments.
4. The production process of low-emissivity curved tempered glass according to claim 1, characterized in that, The low-emissivity glass is 40-45 mm above the upper windshield.