Glass processing method, hot bending glass and protective film

Abstract

The invention provides a glass processing method, hot bending glass and a protective film. The glass processing method comprises the following steps: (1) cutting the glass, and then carrying out CNC (Computer Numerical Control) corner polishing; (2) carrying out first sweeping treatment on the front surface of the glass to enable the side edge of the front surface of the glass to be arc-shaped; (3) cleaning for the first time; (4) the glass is put into a hot bending mold to be subjected to hot bending treatment, so that the reverse side of the glass is sunken inwards, the forming temperature of the hot bending treatment is 650-850 DEG C, and the forming pressure is 4-6 Mpa; (5) carrying out secondary polishing treatment after hot bending treatment, and respectively polishing the front surface and the back surface of the glass; (6) cleaning for the second time after sweeping for the second time; (7) carrying out acid bath after cleaning for the second time; and (8) carrying out toughening treatment after the acid bath. The hot bending glass and the protective film obtained by the method provided by the invention have more comfortable side hand feeling.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of glass processing, in particular to a glass processing method, a heat-bent glass and a protective film. BACKGROUND

[0002] The curved screen has the characteristics of improving visual immersion, optimizing holding feeling and providing novel side interaction, and is usually one of the symbols of flagship models. The traditional protective film includes 2D and 2.5D protective films. The 2D protective film refers to the glass front and back surfaces being flat and the overall thickness being consistent. The 2.5D protective film refers to the glass front surface edge being arc-shaped and the back surface (the surface attached to the screen) being flat, and the overall thickness being inconsistent. Since the curvature of the edge of the curved screen phone screen is large, the traditional 2D protective film and 2.5D protective film cannot adapt to the curvature of the curved screen. If the width size of the protective film is consistent with the overall width of the curved screen, the edge of the protective film cannot be attached to the curvature of the screen edge. After the protective film is attached, the side edge usually has a scratchy feeling, or the width size of the protective film is reduced to be consistent with the width of the flat part of the curved screen, and the arc-shaped edge of the curved screen cannot be protected by the protective film. SUMMARY

[0003] Therefore, in order to overcome at least part of the defects and deficiencies in the prior art, the embodiments of the present application provide a glass processing method, a heat-bent glass and a protective film, which can obtain a better side edge holding feeling.

[0004] Specifically, in one aspect, the embodiments of the present application provide a glass processing method, comprising the following steps: (1) after the glass is cut, the CNC corner polishing is performed; (2) after the CNC corner polishing, the first time of polishing treatment is performed on the front surface of the glass to make the side edge of the front surface of the glass arc-shaped; (3) after the first time of polishing treatment, the first time of cleaning is performed; (4) after the first time of cleaning, the glass is placed into a heat-bending mold to perform heat-bending treatment, so that the back surface of the glass is concave inward; the forming temperature of the heat-bending treatment is 650-850℃, and the forming pressure is 4-6Mpa; (5) after the heat-bending treatment, the second time of polishing treatment is performed to polish the front surface and the back surface of the glass respectively, so as to remove the mold mark, scratches and surface dust points generated after the heat-bending treatment; (6) after the second time of polishing, the second time of cleaning is performed; (7) after the second time of cleaning, acid bath is performed; (8) after the acid bath, the tempering treatment is performed.

[0005] In some embodiments, the heat-bending mold comprises an upper mold and a lower mold arranged oppositely, the lower mold comprises a first lower mold and a second lower mold sleeved outside the first lower mold, the glass is clamped between the upper mold and the lower mold during the heat-bending treatment, the second lower mold is in contact with the edge of the glass to make the glass form an arc-shaped edge, and the first lower mold is in contact with the middle part of the glass.

[0006] In some embodiments, the glass is high-aluminum-silicon glass, and the glass forming temperature of the heat bending treatment is 690-750 DEG C.

[0007] In some embodiments, the glass is lithium-aluminum-silicon glass, and the glass forming temperature of the heat bending treatment is 800-820 DEG C.

[0008] In some embodiments, the heat bending treatment specifically comprises preheating the glass, and then pressure forming after the preheating, and the preheating temperature is 630-750 DEG C.

[0009] In some embodiments, the heat bending treatment specifically further comprises slow cooling treatment after the pressure forming, and the slow cooling temperature is 650-660 DEG C.

[0010] In some embodiments, the polishing liquid specific gravity of the second polishing treatment is 1.06-1.12, and the polishing pressure acting on the glass surface is 4-6 kg / cm 2 . 2 .

[0011] In some embodiments, the second polishing treatment uses a polishing carpet to polish the front surface of the glass, and uses a polishing brush to polish the back surface of the glass.

[0012] The embodiment of the present application provides a heat bending glass obtained by the glass processing method.

[0013] The embodiment of the present application provides a protective film comprising the heat bending glass.

[0014] The embodiment of the present application has at least the following beneficial effects: through the design of the glass forming temperature and forming pressure in the heat bending treatment, and the two polishing treatments before and after the heat bending treatment, the heat bending glass obtained after processing can be smooth and not scratchy, and the protective film can have a comfortable hand feeling. BRIEF DESCRIPTION OF DRAWINGS

[0015] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiment description. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0016] Figure 1 The step flowchart of the glass processing method provided by the embodiment of the present application is shown.

[0017] Figure 2 The exploded structure diagram of the heat bending mold in the embodiment of the present application is shown.

[0018] Figure 3 As Figure 2 A cross-sectional structure schematic view of the hot bending mold is shown. DETAILED DESCRIPTION

[0019] In order to make the purposes, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings. Obviously, the described embodiments are only part of the embodiments of the present application, but not all the embodiments of the present application. Based on the embodiments described in the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the protection scope of the present application.

[0020] The present application aims to provide a glass processing method, which can process 3D protective film to obtain better side experience, and can be divided into two types according to the type of the screen, for the curved screen with the screen edge being arc-shaped and the middle part being flat, the middle part of the glass front and back surface of the 3D protective film is flat, and the edge is arc-shaped; for the curved screen with the whole screen being arc-shaped, the whole front surface and the whole back surface of the 3D protective film are arc-shaped.

[0021] With reference to Figure 1 , the present application provides a glass processing method, comprising the following steps: (1) after the glass is cut, the CNC corner polishing is performed; (2) after the CNC corner polishing, the first light scanning treatment is performed on the front surface of the glass to make the side edge of the glass front surface arc-shaped; (3) after the first light scanning treatment, the first cleaning is performed; (4) after the first cleaning, the glass is put into the hot bending mold for hot bending treatment to make the back surface of the glass concave inward; the forming temperature of the hot bending treatment is 650-850 DEG C, and the forming pressure is 4-6 Mpa; (5) after the hot bending treatment, the second light scanning treatment is performed to polish the front surface and the back surface of the glass respectively, to remove the mold impression, scratches and surface dust points generated after the hot bending treatment; (6) after the second light scanning, the second cleaning is performed; (7) after the second cleaning, the acid bath is performed; (8) after the acid bath, the tempering treatment is performed.

[0022] For example, the glass processing method provided in the above embodiments of the present invention is applicable to glass with a thickness of 0.15~0.8mm, and the dimensions of the glass, for example, are a length less than or equal to 250mm and a width less than or equal to 250mm. The type of glass is not limited; conventionally used glass for making screen protectors, such as high-aluminosilicate glass or lithium aluminum-silicate glass, can be processed using the above glass processing method. Lithium aluminum-silicate glass is made from... For the skeleton, and introduce an appropriate amount Aluminosilicate glass systems containing isoalumina. High-aluminosilicate glass is an aluminosilicate glass containing a high concentration of alumina (Al2O3). Compared to ordinary aluminosilicate glass, high-aluminosilicate glass has a significantly higher alumina content, typically exceeding 20%, and sometimes reaching as high as 80%.

[0023] Cutting refers to the process of cutting large sheets of glass into multiple smaller pieces of suitable size according to the required dimensions. CNC (Computer Numerical Control) edge polishing uses a computer-controlled precision machine tool to perform high-precision, high-efficiency polishing of the glass material according to the design drawings to adapt to the shape of the electronic screen. In this embodiment, two CNC edge polishing processes are performed. The first process uses, for example, a 400-grit grinding head for initial shaping, and the second process uses a 1200-grit grinding head for finishing. Alternatively, different parts of the same grinding head can be used in the two CNC edge polishing processes to achieve different levels of precision. CNC edge polishing may cause micro-cracks to appear at the edges of the glass surface; the second finishing process can further refine these micro-cracks.

[0024] The initial polishing process can be performed on the front of the glass (also known as the A-side) using a polishing carpet (materials such as pure wool, synthetic fibers, and blended fibers, with a pile length of 5mm~30mm and a density of 1300 strands / square centimeter or more) or a polishing brush (materials such as pig bristle brushes or rubber bristle brushes, with a pile length of 0.2mm~0.5mm and a density of 100~150 strands / square centimeter). Specifically, HL-1615A abrasive from Zhongcheng Hailiang Company can be used for polishing. The specific gravity of the polishing slurry is 1.06~1.12, which means the density of the polishing slurry is 1.06~1.12 g / cm³. 3 For example, the specific gravity of the polishing slurry can be 1.06, 1.08, 1.1, 1.12, etc. The polishing time is 120-180 seconds, and the polishing pressure applied to the glass surface is 4 kg / cm². 2 ~6kg / cm 2 For example, the polishing pressure can be 4 kg / cm. 2 5kg / cm 2 Or 6kg / cm 2 This makes the beveled edges of the glass surface smooth and rounded.

[0025] The first cleaning uses alkaline cleaning liquid with pH value greater than 11 to clean the abrasive and other dirt remaining on the glass surface, so as to ensure the cleanliness of the glass before the heat bending treatment.

[0026] The heat bending treatment mainly includes press forming, specifically, the glass is softened by heating after being put into a heat bending mold, and then the glass is pressed to make the back surface (also referred to as B surface) of the glass concave inward, so that the glass is bent to a certain arc according to the required specification. The heat bending mold includes an upper mold 10 and a lower mold 20 arranged oppositely, in some embodiments, the lower mold 20 is an integral structure, the upper mold 10 and the lower mold 20 clamp the glass together during the heat press forming process, the softened glass is extruded by the lower mold 20 moving towards the upper mold 10, and the glass edge is bent to form an arc according to the shape of the upper mold 10 and the lower mold 20.

[0027] In one embodiment of the present application, referring to Figure 2 and Figure 3 , the heat bending mold includes an upper mold 10 and a lower mold 20 arranged oppositely, the lower mold 20 includes a first lower mold 21 and a second lower mold 22 sleeved outside the first lower mold 21, the glass is clamped between the upper mold 10 and the lower mold 20 during the heat bending treatment, the second lower mold 22 contacts the edge of the glass to make the glass form an arc-shaped edge, and the first lower mold 21 contacts the middle part of the glass. By dividing the lower mold 20 into the first lower mold 21 and the second lower mold 22, during the heat press forming process, the middle part of the glass is first clamped by the upper mold 10 and the first lower mold 21, the second lower mold 22 moves towards the upper mold 10 after the glass is softened, so that the edge of the glass is clamped by the upper mold 10 and the second lower mold 22, and the edge of the glass is bent upwards under the forming pressure, and the middle part of the glass is relatively stationary during the process, which can ensure that the middle part of the glass maintains the original flat state and the edge bending arc is also smoother.

[0028] The forming pressure of the heat bending treatment can be, for example, 4 MPa, 4.5 MPa, 5 MPa or 6 MPa. The forming temperature of the heat bending treatment can be adjusted according to different glasses. For example, when the glass is high-aluminum-silicon glass, the forming temperature of the heat bending treatment is 690-750 DEG C. Specifically, when the high-aluminum-silicon glass is float glass, it has a tin side and an air side. During heat bending, the air side is used as the front side, and the tin side is used as the back side. The front side and the back side of the high-aluminum-silicon glass can be heated at different temperatures. For example, the back side is heated at about 750 DEG C, and the front side is heated at about 700 DEG C. The temperature of the back side is higher than that of the front side, which can ensure a high yield. For example, when the glass is lithium-aluminum-silicon glass, the forming temperature of the heat bending treatment is 800-820 DEG C. When the lithium-aluminum-silicon glass has two air sides, the front side and the back side of the lithium-aluminum-silicon glass are heated at the same temperature. Specifically, during the press forming process, the glass can be heated and pressurized in multiple stages. The temperatures in different stages can be the same or different, and the pressures in different stages can be the same or different.

[0029] Specifically, the heat bending treatment specifically includes preheating the glass first, and then press forming after preheating. The preheating temperature is 630-750 DEG C. Specifically, the preheating can be divided into multiple stages, and the preheating temperature in multiple stages can gradually increase to the forming temperature or equal to the forming temperature. When the back side forming temperature of the high-aluminum-silicon glass is higher than the front side forming temperature during the press forming, the preheating temperature of the back side is also higher than that of the front side. Gradual temperature rise through preheating can provide a uniform heating environment for the glass, reduce thermal stress, and prevent glass breakage and micro-cracks.

[0030] Specifically, the heat bending treatment further includes a slow cooling treatment after the press forming. The slow cooling treatment is performed at a temperature of 650-660 DEG C. The slow cooling treatment is annealing at a temperature lower than the forming temperature to eliminate stress. Specifically, the slow cooling treatment can be divided into multiple stages, and the slow cooling temperatures in multiple stages can be the same or different. The temperature applied to the front side and the back side of the glass in the last stage of the slow cooling treatment is the same, which can synchronize the temperature of the front side and the back side of the glass during subsequent cooling process, and ensure the quality of the glass.

[0031] In one specific embodiment of the present application, the high-aluminum-silicon glass with a thickness of 0.33 mm is taken as an example. The specific preheating temperature, forming temperature and slow cooling temperature are shown in Table 1 (unit: DEG C).

[0032] Table 1:

[0033] The lithium-aluminum-silicon glass with a thickness of 0.33 mm is taken as an example. The specific preheating temperature, forming temperature and slow cooling temperature are shown in Table 2 (unit: DEG C).

[0034] Table 2:

[0035] Comparative Examples 1-7 and Examples 1-4 were used to verify the effect of different forming pressures and slow cooling pressures on the profile of the glass after heat bending. The forming pressure (in MPa), slow cooling 1 pressure (in MPa), and profile (mm) results are shown in Table 3. Each comparative example included heat bending of high-alumina-silica glass and lithium-alumina-silica glass at the corresponding forming pressure and slow cooling pressure, and each example included heat bending of high-alumina-silica glass and lithium-alumina-silica glass at the corresponding forming pressure and slow cooling pressure. The high-alumina-silica glass was heat bent using the temperatures in Table 1 above, and the lithium-alumina-silica glass was heat bent using the temperatures in Table 2 above. The first polishing was performed using a HL-1615A abrasive from Zhongchuang Hailiang Company with a polishing liquid having a specific gravity of 1.06-1.12 and a polishing time of 120-180 s, and the polishing pressure on the glass surface was 4-6 kg / cm 2 ~6kg / cm 2 . The first cleaning was performed using a cleaning agent from Guangdong Jinquanfeng Technology Co., Ltd. with a model number of 501. The glass that met the standards after each step before heat bending was selected to proceed to the next step, and the selection standards are shown in Tables 4 and 5, where D is the single-point diameter, DS is the interval, W is the line width, L is the line length, and N is the number; X is the length, Y is the width, Z is the depth, and T is the glass thickness.

[0036] Table 3:

[0037] Table 4:

[0038] Table 5:

[0039] According to the results in Table 3, for both high-alumina-silica glass and lithium-alumina-silica glass, when the forming pressure was 4-6 MPa, the profile of the glass after heat bending was less than 0.15 mm. When the forming pressure was less than 4 MPa, the surface of the glass after forming was not smooth enough, and the profile was greater than 0.15 mm. When the pressure was greater than 6 MPa, the glass broke due to the excessive pressure. Therefore, a forming pressure of 4-6 MPa can ensure the quality of the glass while better matching the design curvature of the glass.

[0040] The second polishing treatment adopts a polishing carpet to polish the front surface of the glass, and adopts a polishing brush to polish the back surface of the glass. The polishing carpet is made of pure wool, synthetic fiber or blended fiber, for example, and can include straight hair and curly hair. The length of the hair of the polishing carpet is 5mm to 30mm, the diameter of the single hair is less than 0.1mm, and the density is more than 1300 hairs per square centimeter. The polishing brush can be a glue filament brush, a pig hair brush or a mixed hair brush, for example. The length of the hair of the polishing brush is 20mm to 50mm, for example, the diameter of the single hair is 0.2mm to 0.5mm, and the density is 100 to 150 hairs per square centimeter. Since the front surface is convex, the polishing carpet can be used to polish the entire front surface of the glass. Since the back surface is concave, the hair tips of the polishing brush can be inserted into the concave surface to polish the back surface, so that the polishing carpet cannot be used to polish the entire back surface or the pressure is too large to affect the curvature of the glass.

[0041] The second polishing treatment can use HL-1615A abrasive of Zhongcheng Hailiang Company, and the specific gravity of the polishing liquid is 1.06 to 1.12, i.e. the density of the polishing liquid is 1.06 to 1.12g / cm 3 . For example, the specific gravity of the polishing liquid can be 1.06, 1.08, 1.1, 1.12, etc. The polishing pressure is 4kg / cm 2 to 6kg / cm 2 . For example, it can be 4kg / cm 2 , 5kg / cm 2 or 6kg / cm 2 . The rotation speed of the front surface is 10 to 15 RPM (RPM is the abbreviation of Revolutions Per Minute, i.e. revolutions per minute), and the rotation speed of the back surface is 260 RPM. The polishing time is 16 minutes (8 minutes of forward rotation and 8 minutes of reverse rotation). By adjusting the specific gravity of the polishing liquid and the polishing pressure, the mold marks, scratches, surface dust points and other defects generated after the heat bending treatment can be removed more efficiently, and the yield can be improved.

[0042] Experiments 1 to 24 use different specific gravities of polishing liquid and different polishing pressures for the second polishing treatment. The specific gravity of the polishing liquid, the polishing pressure (unit: kg / cm 2 ) and the yield (the number of no mold marks, scratches, dust points, dirt and other defects / verification number*100%) are shown in Table 6. Before the second polishing treatment, the first polishing treatment uses HL-1615A abrasive of Zhongcheng Hailiang Company, the specific gravity of the polishing liquid is 1.06 to 1.12, the polishing time is 120s to 180s, and the polishing pressure acting on the surface of the glass is 4kg / cm 2 to 6kg / cm 2The first cleaning used cleaning agent 501 from Guangdong Jinquanfeng Technology Co., Ltd. The forming temperature for the hot bending process was as specified in Tables 1 and 2, and the forming pressure was 4-6 MPa. Before the second polishing process, glass that met the standards after each step was screened to proceed to the next step, with the screening standards referring to Tables 4 and 5. Each experiment from Experiment 1 to Experiment 24 included multiple pieces of glass as verification samples. These samples included high-alumina-silicate glass and lithium-alumina-silicate glass that met the screening standards. The samples were randomly selected from the glass that still met the standards in Tables 4 and 5 after the first cleaning, with the two types of glass being randomly selected in approximately equal proportions.

[0043] Table 6:

[0044] As shown in Table 6, the specific gravity of the polishing slurry is between 1.06 and 1.12, and the polishing pressure is 4 kg / cm². 2 ~6kg / cm 2 At this time, the yield after the second polishing process can reach more than 90%. Too low pressure or too low specific gravity of polishing fluid will lead to a decrease in yield.

[0045] The second cleaning is similar to the first cleaning. An alkaline cleaning solution with a pH value greater than 11 can be used to clean the residual abrasive and other dirt on the glass surface to ensure the cleanliness of the glass before the acid bath.

[0046] Acid baths are used to remove micro-cracks and minor edge chipping defects from glass surfaces. For example, the chemical solutions used in an acid bath are as follows by mass percentage: 45%~50% water, 25%~30% hydrofluoric acid, 8%~12% hydrochloric acid, and 2%~7% sulfuric acid. The acid bath time is 20~60 seconds.

[0047] Tempering is used to harden the surface of glass. For example, the glass is first preheated in a preheating furnace at 320-380℃ for 1 hour. After preheating, the glass is placed in tempering salt at 360℃~440℃ for ion exchange for 1~3 hours. The tempering salt is potassium nitrate with a concentration greater than 90%.

[0048] The embodiment of the present application also provides a hot bending glass obtained by the glass processing method. The embodiment of the present application also provides a protective film comprising the hot bending glass. For example, after the tempering treatment, the protective film further comprises (9) an electroplating AF (Anti-Fingerprint) treatment and (10) an assembly. For example, after the tempering treatment and before the electroplating AF treatment, a cleaning is performed, and the cleaning can be the first cleaning and the second cleaning, so that the cleanliness of the glass before the electroplating AF treatment is ensured. The electroplating AF treatment can be performed by using an evaporation or a magnetron sputtering coating process, and an AF pill is used for coating, so that the surface is smoother, and the water drop angle (the water drop angle is defined as the angle between the gas-liquid phase interface and the solid-liquid phase interface at the three-phase junction, and the water drop angle can be used to evaluate the hydrophobic property of the material) is greater than 115 degrees. The assembly can comprise the following steps: pasting an AB glue, pasting a release film, assembling a pulling belt, assembling an assisting device, and the like, wherein the AB glue is used for pasting the protective film on the screen of the electronic device, the release film is used for protecting the AB glue before the protective film is pasted, the pulling belt is connected with the release film and is used for tearing the release film, and the assisting device is used for assisting the pasting of the protective film on the screen of the electronic device.

[0049] In addition, it can be understood that the foregoing embodiments are only exemplary descriptions of the present application, and the technical solutions of the embodiments can be combined and used as long as the technical features do not conflict, the structures do not contradict, and the purposes of the present application are not violated.

[0050] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: the technical solutions recorded in the foregoing embodiments can still be modified, or some technical features can be replaced by equivalents; and these modifications or replacements do not make the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A method of glass processing, characterized by, The method comprises the following steps: (1) after cutting the glass, performing CNC corner polishing; (2) after the CNC corner polishing, performing first polishing on the front surface of the glass to make the side of the front surface of the glass arc-shaped; (3) after the first polishing, performing first cleaning; (4) after the first cleaning, placing the glass into a hot bending mold to perform hot bending treatment to make the back surface of the glass concave inward, wherein the forming temperature of the hot bending treatment is 650-850 DEG C, and the forming pressure is 4-6 Mpa; (5) after the hot bending treatment, performing second polishing to polish the front surface and the back surface of the glass respectively; (6) after the second polishing, performing second cleaning; (7) after the second cleaning, performing acid bath; (8) after the acid bath, performing tempering treatment.

2. The glass processing method of claim 1, wherein, The hot bending mold comprises an upper mold and a lower mold arranged oppositely, wherein the lower mold comprises a first lower mold and a second lower mold sleeved outside the first lower mold, the glass is clamped between the upper mold and the lower mold during the hot bending treatment, the second lower mold is in contact with the edge of the glass to make the glass form an arc-shaped edge, and the first lower mold is in contact with the middle part of the glass.

3. The glass processing method of claim 1, wherein, The glass is high-aluminum-silicon glass, and the forming temperature of the glass during the hot bending treatment is 690-750 DEG C.

4. The glass processing method of claim 1, wherein, The glass is lithium-aluminum-silicon glass, and the forming temperature of the glass during the hot bending treatment is 800-820 DEG C.

5. The glass processing method of claim 1, wherein, The hot bending treatment specifically comprises preheating the glass first, and then performing pressure forming after the preheating, wherein the preheating temperature is 630-750 DEG C.

6. The glass processing method of claim 1, wherein, The hot bending treatment specifically further comprises slow cooling treatment after the pressure forming, and the slow cooling temperature is 650-660 DEG C.

7. The glass processing method of claim 1, wherein The polishing slurry used in the second polishing treatment has a specific gravity of 1.06~1.12, and the polishing pressure applied to the glass surface is 4 kg / cm². 2 ~6kg / cm 2 .

8. The glass processing method of claim 1, wherein, The second polishing treatment adopts a polishing carpet to polish the front surface of the glass and a polishing brush to polish the back surface of the glass.

9. A heat bent glass, characterized by The glass obtained by the method according to any one of claims 1-8.

10. A protective film characterized by comprising: The hot-bent glass according to claim 9.

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