Preparation process of ultrathin glass mirror with toughening function

Abstract

The invention discloses a preparation process of an ultrathin glass mirror with a toughening function, which comprises the following steps: S1, inspecting, cutting, edging and cleaning a glass raw sheet to obtain a glass to-be-treated state; s2, feeding the glass to be treated into a toughening furnace for heating; the toughening furnace adopts a plurality of ceramic rollers which are arranged in parallel to realize transmission of glass; s3, the heated glass in the toughening furnace enters a cooling area, the cooling area is sequentially divided into a strong-wind toughening area, a low-wind cooling area and a stable normal-temperature area in the moving direction of the glass, and the glass is cooled when reaching the normal temperature in the stable normal-temperature area; and S4, coating the cooled tempered glass with a film through a magnetron sputtering process, spraying a layer of red back paint, and then spraying a layer of black back paint to finish the mirror plating process.

Description

Technical Field

[0001] The present invention relates to the technical field of glass processing, in particular to a process for preparing an ultra-thin glass mirror with a tempering function. Background Art

[0002] Tempered glass (also known as reinforced glass) is a type of safety glass. To increase its strength, compressive stress is typically applied to the glass surface, often through chemical or physical methods. When subjected to external forces, compressive stress is first applied to the glass surface, thereby increasing its load-bearing capacity and enhancing its resistance to wind pressure, cold, heat, and impact. Tempered glass offers the advantages of safety, high strength, and thermal stability. Safety is reflected in the fact that when the glass is damaged by external forces, the fragments break into small, blunt-angled, honeycomb-like particles, making them less likely to cause serious harm. Its high strength is reflected in the fact that tempered glass of the same thickness has an impact resistance 3 to 5 times that of ordinary glass and a flexural strength 3 to 5 times that of ordinary glass. Tempered glass also exhibits excellent thermal stability, withstanding temperature fluctuations 3 times greater than ordinary glass, including fluctuations of 300°C.

[0003] As we all know, mirrors are mainly made of glass and are fragile. Once broken, they can easily cause harm to the human body. Especially during transportation, due to the unevenness of the ground, the mirror's large amplitude of vibration, and the unstable placement of the mirror, it often causes the mirror to shatter due to violent collisions. Therefore, tempering the mirror is an effective way to effectively reduce the loss of mirrors during transportation. The existing glass tempering process generally uses high-temperature resistant rollers made of ceramics and other materials to transport the glass forward at a certain speed on a conveyor line. The glass is first heated and softened before reaching a cooling station. The softened glass is immediately cooled by air cooling to achieve glass tempering. However, after the glass is heated and softened, it is easy to deform during the forward conveyance process. The glass produced by the existing tempered glass production line cannot meet the deformation requirements of the mirror, resulting in poor optical flatness of the final tempered mirror and a high scrap rate. Summary of the Invention

[0004] The object of the present invention is to provide a process for preparing an ultra-thin glass mirror with a tempering function, so as to solve the problems raised in the above background technology.

[0005] A process for preparing an ultra-thin glass mirror with a tempering function, characterized by comprising the following steps: S1: Inspect, cut, grind and clean the original glass. At this time, the glass is in the waiting state; S2: The glass to be processed is sent into the tempering furnace and transported by a number of ceramic rollers arranged in parallel to each other. The glass passes through the preheating section, the softening and deformation section, and the cooling and heat preservation section in sequence to complete the heating; Among them, the purpose of controlling the glass deformation is achieved by changing the distance between two adjacent ceramic rollers in the preheating section, softening and deformation section and cooling and heat preservation section and the speed of the corresponding ceramic rollers; S3: The heated glass passes through the strong wind tempering zone, the low wind cooling zone and the stable normal temperature zone in sequence to cool the glass. The wind pressure in the strong wind tempering zone is the first wind pressure, the cooling wind pressure in the low wind cooling zone is 80%-90% of the first wind pressure, and the cooling wind pressure in the stable normal temperature zone is 40%-50% of the first wind pressure. The strong wind tempering zone uses the strong wind of the first wind pressure to cool the glass temperature to below 330°C, and the low wind cooling zone cools the glass temperature to below 100°C. S4: After the cooled tempered glass is coated by magnetron sputtering, a layer of red back paint is applied, followed by a layer of black back paint to complete the mirror coating process; S5: Regularly spot-check the flatness of the glass mirrors that have completed the mirror coating process. If the test is qualified, continue production. If the test is unqualified, adjust the rotation speed of the ceramic roller and the heating temperature of the heating area of the tempering furnace to adjust the flatness of the glass mirror. The glass mirrors that have passed the flatness test will be packaged.

[0006] Preferably, in step S1, the temperature of the preheating section and the softening and deformation section is set to 640-680°C, and the temperature of the cooling and heat preservation section is 30-50°C lower than the temperature of the softening and deformation section.

[0007] Preferably, in step S2, the strong wind tempering zone adopts constant temperature hot air of 80°C for cooling, the low wind cooling zone and the stable normal temperature zone both adopt room temperature air for cooling, and the first wind pressure is set to 10-12 KPa.

[0008] Preferably, the heating time of the glass in the preheating section, softening and deformation section, and cooling and insulation section is set to T1, T2, and T3, respectively, and T1:T2:T3 is set to 6:1:2. The rotational speed of the ceramic rollers in the preheating section, softening and deformation section, and cooling and insulation section is set to V1, V2, and V3, respectively, and V1:V2:V3 is set to 1:3:3.

[0009] Preferably, the cooling time of the glass in the strong wind tempering zone, low wind cooling zone and stable normal temperature zone is set to T4, T5 and T6 respectively, and T4:T5:T6 is set to 2:3:6. The rotational speed of the ceramic rollers in the strong wind tempering zone, low wind cooling zone and stable normal temperature zone is set to V4, V5 and V6 respectively, and V4:V5:V6 is set to 3:1:1.

[0010] Compared with the prior art, the present invention has the following beneficial effects: In the present invention, by controlling the distance between adjacent ceramic rollers at different positions in the tempering furnace and coordinating the corresponding moving speeds, the deformation of the glass at high temperature can be effectively reduced during the glass moving process, thereby meeting the deformation requirements of the glass mirror. In the present invention, the temperature of the cooling and heat preservation section is lower than that of the softening and deformation section, which can effectively promote the uniformity of the temperature inside and outside the tempered glass, and reduce the fluidity of the deformed glass, making it easier for the ceramic roller to flatten the deformed glass during the glass conveying process, and effectively reducing the deformation of the glass. The present invention adopts a segmented cooling design, which can not only reduce internal stress and avoid glass cracking while ensuring the tempering effect, but also achieve rapid cooling of the glass, which can effectively improve processing efficiency. At the same time, the strong wind tempering zone uses constant temperature hot air for cooling, which can effectively reduce the impact of seasonal temperature changes on the glass tempering effect, and ensure the uniformity of mirror production quality. DETAILED DESCRIPTION

[0011] The present invention will be further described in detail below with reference to the embodiments.

[0012] Example 1: A process for preparing an ultra-thin glass mirror with a tempering function, characterized by comprising the following steps: S1: Inspect, cut, grind and clean the original glass. At this time, the glass is in the waiting state; S2: The glass to be processed is fed into the tempering furnace and conveyed by a number of ceramic rollers arranged in parallel to each other. The glass passes through the preheating section, the softening and deformation section, and the cooling and insulation section in sequence to complete the heating. The temperature of the preheating section and the softening and deformation section is set at 640-680℃ and gradually increases. The temperature of the cooling and insulation section is 30-50℃ lower than that of the softening and deformation section. The heating time of the glass in the preheating section, softening and deformation section, and cooling and insulation section is set to T1, T2, and T3, respectively, and T1:T2:T3 is set to 6:1:2. The rotational speeds of the ceramic rollers in the preheating section, softening and deformation section, and cooling and insulation section are set to V1, V2, and V3, respectively, and V1:V2:V3 is set to 1:3:3. The purpose of controlling the amount of glass deformation is achieved by changing the distance between two adjacent ceramic rollers in the preheating section, softening and deformation section, and cooling and insulation section and the rotational speed of the corresponding ceramic rollers. S3: The heated glass passes through the strong wind tempering zone, the low wind cooling zone and the stable normal temperature zone in sequence to cool the glass. The wind pressure in the strong wind tempering zone is the first wind pressure, the cooling wind pressure in the low wind cooling zone is 80%-90% of the first wind pressure, and the cooling wind pressure in the stable normal temperature zone is 40%-50% of the first wind pressure. The strong wind tempering zone uses a constant temperature hot air of 80°C for cooling, and the strong wind tempering zone uses a strong wind of the first wind pressure to cool the glass temperature to below 330°C. The low wind cooling zone and the stable normal temperature zone both use room temperature wind for cooling, and the low wind cooling zone cools the glass temperature to below 100°C. The first wind pressure is set to 10-12KPa. S4: After the cooled tempered glass is coated by magnetron sputtering, a layer of red back paint is applied, followed by a layer of black back paint to complete the mirror coating process; S5: Regularly spot-check the flatness of the glass mirrors that have completed the mirror coating process. If the test is qualified, continue production. If the test is unqualified, adjust the rotation speed of the ceramic roller and the heating temperature of the heating area of the tempering furnace to adjust the flatness of the glass mirror. The glass mirrors that have passed the flatness test will be packaged.

[0013] After testing, the mirror image does not deform, and the packaged glass mirror does not break when dropped freely from a height of 10CM from the ground.

[0014] Example 2: A process for preparing an ultra-thin glass mirror with a tempering function, characterized by comprising the following steps: S1: Inspect, cut, grind and clean the original glass. At this time, the glass is in the waiting state; S2: The glass to be processed is sent into the tempering furnace and conveyed by a number of ceramic rollers arranged in parallel with each other. The glass passes through the preheating section, the softening and deformation section, and the cooling and heat preservation section in sequence to complete the heating. The temperature of the preheating section is set at 640°C, the temperature of the softening and deformation section is set at 680°C and gradually increases. The temperature of the cooling and heat preservation section is 30-50°C lower than that of the softening and deformation section. The heating time of the glass in the preheating section, softening and deformation section, and cooling and insulation section is set to T1, T2, and T3, respectively, and T1:T2:T3 is set to 6:1:2. The rotational speeds of the ceramic rollers in the preheating section, softening and deformation section, and cooling and insulation section are set to V1, V2, and V3, respectively, and V1:V2:V3 is set to 1:3:3. The purpose of controlling the amount of glass deformation is achieved by changing the distance between two adjacent ceramic rollers in the preheating section, softening and deformation section, and cooling and insulation section and the rotational speed of the corresponding ceramic rollers. S3: The heated glass passes through the strong wind tempering zone, the low wind cooling zone and the stable normal temperature zone in sequence to cool the glass. The wind pressure in the strong wind tempering zone is the first wind pressure, the cooling wind pressure in the low wind cooling zone is 80%-90% of the first wind pressure, and the cooling wind pressure in the stable normal temperature zone is 40%-50% of the first wind pressure. The strong wind tempering zone uses a constant temperature hot air of 80°C for cooling, and the strong wind tempering zone uses a strong wind of the first wind pressure to cool the glass temperature to below 330°C. The low wind cooling zone and the stable normal temperature zone both use room temperature wind for cooling, and the low wind cooling zone cools the glass temperature to below 100°C. The first wind pressure is set to 10-12KPa. S4: After the cooled tempered glass is coated by magnetron sputtering, a layer of red back paint is applied, followed by a layer of black back paint to complete the mirror coating process; S5: Regularly spot-check the flatness of the glass mirrors that have completed the mirror coating process. If the test is qualified, continue production. If the test is unqualified, adjust the rotation speed of the ceramic roller and the heating temperature of the heating area of the tempering furnace to adjust the flatness of the glass mirror. The glass mirrors that have passed the flatness test will be packaged.

[0015] After testing, the mirror image does not deform, and the packaged glass mirror does not break when dropped freely from a height of 5CM from the ground.

[0016] The above content is merely an example and explanation of the process of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in a similar manner. As long as they do not deviate from the process of the invention or exceed the scope defined by the claims, they should all fall within the scope of protection of the present invention.

Claims

1. A process for preparing an ultra-thin glass mirror with a tempering function, characterized in that: The steps include: S1: Inspect, cut, grind and clean the original glass. At this time, the glass is in the waiting state; S2: The glass to be processed is sent into the tempering furnace and transported by a number of ceramic rollers arranged in parallel to each other. The glass passes through the preheating section, the softening and deformation section, and the cooling and heat preservation section in sequence to complete the heating; Among them, the purpose of controlling the glass deformation is achieved by changing the distance between two adjacent ceramic rollers in the preheating section, softening and deformation section and cooling and heat preservation section and the speed of the corresponding ceramic rollers; S3: The heated glass passes through the strong wind tempering zone, the low wind cooling zone and the stable normal temperature zone in sequence to cool the glass. The wind pressure in the strong wind tempering zone is the first wind pressure, the cooling wind pressure in the low wind cooling zone is 80%-90% of the first wind pressure, and the cooling wind pressure in the stable normal temperature zone is 40%-50% of the first wind pressure. The strong wind tempering zone uses the strong wind of the first wind pressure to cool the glass temperature to below 330°C, and the low wind cooling zone cools the glass temperature to below 100°C. S4: After the cooled tempered glass is coated by magnetron sputtering, a layer of red back paint is applied, followed by a layer of black back paint to complete the mirror coating process; S5: Regularly spot-check the flatness of the glass mirrors that have completed the mirror coating process. If the test is qualified, continue production. If the test is unqualified, adjust the rotation speed of the ceramic roller and the heating temperature of the heating area of the tempering furnace to adjust the flatness of the glass mirror. The glass mirrors that have passed the flatness test will be packaged.

2. The process for preparing an ultra-thin glass mirror with a tempering function as claimed in claim 1, wherein: In step S1, the temperature of the preheating section and the softening and deformation section is set to 640-680°C, and the temperature of the cooling and heat preservation section is 30-50°C lower than the temperature of the softening and deformation section.

3. The process for preparing an ultra-thin glass mirror with a tempering function as claimed in claim 1, wherein: In step S2, the strong wind tempering zone is cooled by constant temperature hot air of 80°C, and the low wind cooling zone and the stable normal temperature zone are cooled by room temperature air. The first wind pressure is set to 10-12KPa.

4. The process for preparing an ultra-thin glass mirror with a tempering function as claimed in claim 1, wherein: The heating time of the glass in the preheating section, softening and deformation section, and cooling and insulation section is set to T1, T2, and T3, respectively, and T1:T2:T3 is set to 6:1:

2. The rotational speed of the ceramic rollers in the preheating section, softening and deformation section, and cooling and insulation section is set to V1, V2, and V3, respectively, and V1:V2:V3 is set to 1:3:

3.

5. The process for preparing an ultra-thin glass mirror with a tempering function as claimed in claim 1, wherein: The cooling time of the glass in the strong wind tempering zone, low wind cooling zone and stable normal temperature zone is set to T4, T5 and T6 respectively, and T4:T5:T6 is set to 2:3:

6. The rotational speed of the ceramic rollers in the strong wind tempering zone, low wind cooling zone and stable normal temperature zone is set to V4, V5 and V6 respectively, and V4:V5:V6 is set to 3:1:1.