A process for the production of PVB laminated glass

Abstract

The application discloses a preparation process of PVB laminated glass, and takes two pieces of white plate glass subjected to cutting and edge grinding as starting raw materials, and the preparation method comprises the following steps: S1, sequentially performing decontamination, rinsing and drying on the two pieces of glass original pieces to obtain surface clean and stain-free glass to be combined; and the two pieces of glass are respectively recorded as a single glass and b single glass. S2, in a controlled clean environment, spreading the PVB film strip end section of the PVB film strip taken out from the film strip storage roller on the bonding surface of the a single glass, then aligning and stacking the b single glass above the PVB film strip end section to obtain a three-layer combined piece body of the a single glass, the PVB film strip end section and the b single glass; and then cutting the PVB film strip end section along the edges of the three-layer combined piece body by a trimming device. Through synergistic control, the interlayer gas is fully discharged, the stable chemical bonding of the PVB resin and the glass surface is promoted, and the bubble, glue deficiency and thermal stress residue are avoided.

Description

Technical Field

[0001] This invention belongs to the field of glass preparation. Background Technology

[0002] PVB laminated glass is widely used in automotive windshields, building curtain walls, and curved skylights due to its excellent safety performance, sound insulation, and penetration resistance.

[0003] However, insufficient cleanliness or high humidity in the film assembly environment can introduce dust and moisture, leading to bubbles and interface defects after hot pressing and curing. In the subsequent pre-pressing and autoclave curing stages, if a single or rapid heating and pressurization method is used, the air remaining between the glass and film layers cannot fully escape or dissolve. Combined with incomplete rheological venting of the film, this easily results in poor edge sealing, internal bubble residue, and uneven adhesion, affecting the product's durability and safety level.

[0004] Meanwhile, how to uniformly and flawlessly bond a flat PVB film to the glass surface has always been a problem in the industry. Traditional lamination methods mostly rely on manual spreading or simple mechanical rolling, which easily leads to wrinkles due to the mismatch between the film and the curvature of the curved surface. Forcibly stretching the film to eliminate wrinkles will result in localized thinning and concentration of residual internal stress, ultimately causing problems such as uneven light transmittance, optical distortion, inconsistent bonding strength, and even delamination and cracking during use. Summary of the Invention

[0005] Purpose of the invention: In order to overcome the shortcomings of the existing technology, the present invention provides a manufacturing process for PVB laminated glass. Through synergistic control, the interlayer gas is fully exhausted, promoting the formation of stable chemical bonds between PVB resin and the glass surface, and avoiding bubbles, missing glue and residual thermal stress.

[0006] Technical Solution: To achieve the above objectives, the present invention provides a process for preparing PVB laminated glass, using two pieces of cut and edge-ground white glass as starting materials. The preparation method includes the following steps:

[0007] S1. The two original glass sheets are cleaned, rinsed and dried in sequence to obtain clean and stain-free glass sheets to be assembled; these are denoted as a single glass sheet and b single glass sheet respectively.

[0008] S2. In a controlled clean environment, the end section of the PVB film tape led out from the film tape storage roller is spread on the bonding surface of the monolithic glass a. Then, monolithic glass b is aligned and stacked on top of the end section of the PVB film tape, resulting in a three-layer composite sheet consisting of monolithic glass a, the end section of the PVB film tape, and monolithic glass b. Then, a trimming device cuts the end section of the PVB film tape along the edge of the three-layer composite sheet, thereby forming a uniformly spread PVB film between monolithic glass a and monolithic glass b.

[0009] S3. The obtained three-layer laminated sheet is heated and softened and pressure-treated to allow the PVB film to initially bond with the glass and achieve edge sealing, thus obtaining a pre-pressed semi-finished product.

[0010] S4. The pre-pressed semi-finished product is sent into the autoclave and a temperature and pressure control process is adopted, which involves segmented heating and pressurization, multi-stage heat preservation and pressure holding, and gradual cooling and pressure release, so that the PVB film melts and forms a firm bond with the glass surface.

[0011] Furthermore, in step S1, rinsing is performed by rinsing the glass surface with pure water with a conductivity of ≤20μS; drying is performed by air-drying the glass with purified dry hot air at 40℃~60℃, and the dried glass is left to stand at room temperature for later use.

[0012] Furthermore, in step S2, the temperature of the controlled clean environment is controlled at 20±5℃, and the relative humidity is controlled at 20%~40%; during the lamination process, the bonding surfaces of the glass and the film are kept clean and free of dust and impurities.

[0013] Furthermore, in step S2, the PVB film is cut to a size larger than the glass size, with a 3-5mm margin on all four sides.

[0014] Furthermore, in step S3, a first heating chamber, a first pressurizing unit, a second heating chamber, and a second pressurizing unit are arranged sequentially along the conveying direction; the laminated sheet first enters the first heating chamber for preheating, completes the initial clamping and degassing through the first pressurizing unit, then enters the second heating chamber for heating to soften the PVB film, and completes the secondary clamping through the second pressurizing unit.

[0015] Furthermore, in step S3, the heating temperature during the clamping process is controlled at 180±10℃.

[0016] Furthermore, in step S4, the segmented temperature and pressure control process specifically includes:

[0017] Pressure and temperature rise stage: After closing and sealing the autoclave door, start the internal circulation fan and cooling water pump. Set the target pressure to 12±1kg, the target heating temperature to 135±10℃, and the cooling start temperature to 150℃. When the pressure inside the autoclave rises to 2~3kg, turn on the heating system. When the temperature and pressure are close to the set values, maintain the temperature and pressure for 10 minutes.

[0018] Medium-temperature transition stage: Maintain the pressure inside the vessel at 12±1kg, control the heating temperature at 130℃~140℃, and when the temperature inside the vessel rises to 100℃, maintain the temperature and pressure for 10 minutes.

[0019] High-temperature curing stage: Maintain the pressure inside the autoclave at 12 kg and control the heating temperature at 130℃~140℃. Start timing when the temperature inside the autoclave reaches 140℃ and the pressure reaches 12 kg. Maintain the temperature and pressure for 1~2 hours.

[0020] Cooling and depressurization stage: Stop heating, start cooling water circulation to cool down, and set the cooling termination temperature to 50℃; when the temperature inside the reactor drops to 50℃, slowly open the exhaust valve to reduce the pressure inside the reactor to atmospheric pressure, and complete the curing.

[0021] Beneficial effects: This solution organically integrates a staged hot-pressing pre-pressing process, including preheating, initial roll pressing for venting, and high-temperature secondary roll pressing for edge sealing, with a multi-stage autoclave curing process consisting of pressurization and heating, medium-temperature transition, high-temperature pressure holding for bonding, and slow cooling and pressure release. Through coordinated control, interlayer gases are fully exhausted, promoting the formation of stable chemical bonds between PVB resin and the glass surface, and avoiding bubbles, insufficient resin, and residual thermal stress.

[0022] The film of this invention maintains a natural, firm shape without wrinkles or stretching throughout the entire process. Its attachment speed is synchronized with the tangential speed of the arc surface in real time, eliminating shearing wrinkles and additional stretching from a kinematic perspective, thus ensuring uniform film thickness and no air bubbles at the interface.

[0023] This solves the problem of avoiding wrinkles and stretching simultaneously in traditional film application, enabling curved laminated glass to achieve excellent optical uniformity and uniform adhesive strength. Attached Figure Description

[0024] Figure 1 For process flow diagram;

[0025] Figure 2 This is a schematic diagram of the lamination process for flat glass.

[0026] Figure 3 This is a schematic diagram of the lamination process for curved glass.

[0027] Figure 4 This is a schematic diagram of the completed curved glass surface. Detailed Implementation

[0028] The invention will now be further described with reference to the accompanying drawings.

[0029] The clear glass in this design is sodium-calcium silicate float glass; the PVB film uses polyvinyl butyral resin as the base material, with the addition of appropriate amounts of plasticizer and coupling agent.

[0030] like Figures 1 to 4 The process for preparing a PVB laminated glass, shown below, uses two pieces of cut and edge-ground white glass as starting materials. The preparation method includes the following steps:

[0031] S1. The two original glass sheets are sequentially cleaned, rinsed with pure water, and dried with hot air to obtain clean, stain-free glass sheets ready for assembly; these are denoted as a single glass sheet 2a and b single glass sheet 2b, respectively.

[0032] S2. In a controlled clean environment, the end segment 1a of the PVB film tape 1 led out from the film tape storage roller is spread on the bonding surface of the single glass 2a. Then, the single glass 2b is aligned and stacked on top of the end segment 1a of the PVB film tape, resulting in a three-layer composite sheet of single glass 2a, end segment 1a of the PVB film tape, and single glass 2b of the single glass. Then, the trimming device cuts the end segment 1a of the PVB film tape along the edge of the three-layer composite sheet, thereby forming a uniformly spread PVB film 1b between single glass 2a and single glass 2b of the single glass. The precise control of the spreading process effectively avoids wrinkles and air bubbles that may be introduced by human operation, creating a good initial interface state for subsequent pre-pressing and curing.

[0033] S3. The three-layer laminated sheet is fed into a hot press unit. After heating and softening and pressure treatment, the air between the glass and the film layer is discharged, so that the PVB film 1a is initially bonded to the glass and the edge is sealed, and a pre-pressed semi-finished product is obtained. The hot pressing pre-pressing process is to prevent the back seepage of external gas during the high-pressure autoclave treatment and to ensure the final bonding strength.

[0034] S4. The pre-pressed semi-finished product is fed into a high-pressure autoclave. A temperature and pressure control process is adopted, which involves segmented heating and pressurization, multi-segment heat preservation and pressure holding, and gradual cooling and pressure release, so that the PVB film 1a melts and forms a firm bond with the glass surface. Segmented temperature and pressure control can avoid single drastic changes that could cause bubbles, uneven shrinkage, or poor adhesion of the film.

[0035] S5. Remove the cured laminated glass, and after edge trimming, surface cleaning, and quality inspection, obtain the finished PVB laminated glass.

[0036] In step S1 above, the pure water rinsing uses room temperature pure water with a conductivity ≤20μS to rinse the glass surface; the hot air drying uses purified dry hot air at 40℃~60℃ to air dry the glass, and the dried glass is left to stand at room temperature for later use.

[0037] In step S2 above, the controlled clean environment has an air cleanliness level of 100,000, an ambient temperature of 20±5℃, and a relative humidity of 20%~40%. During the lamination process, the bonding surfaces of the glass and the film remain clean and free of floating dust and impurities. This environmental control can keep the moisture absorption rate of the PVB film below 0.2%, suppress autoclave bubble defects caused by water vapor evaporation, and avoid electrostatic adsorption of dust that affects the light transmittance of the interlayer.

[0038] In step S2 above, the cut size of the PVB film 1a is larger than the glass size, with a 3-5mm allowance on all four sides to compensate for film shrinkage during the heat treatment process. The heat shrinkage rate of PVB film when heated is about 1.5% to 2%. The allowance ensures that the film can still completely cover the glass edge after curing, avoiding missing adhesive or edge bubbles. This allowance is finally removed in the edge trimming process.

[0039] In step S3 above, a first heating chamber, a first pressurizing unit, a second heating chamber, and a second pressurizing unit are sequentially arranged along the conveying direction. The laminated sheet first enters the first heating chamber for preheating, undergoes initial clamping and venting by the first pressurizing unit, and then enters the second heating chamber for heating to soften the PVB film. The second pressurizing unit then completes secondary clamping and edge sealing. The preheating temperature of the first heating chamber is controlled at 120~150℃, ensuring the film reaches its softening point but has not yet flowed, facilitating venting. The first pressurizing unit applies a pressure of 0.3~0.5MPa to expel most of the air between the glass and the film. After the second heating chamber is heated to 180±10℃, the film flows fully, and the second pressurizing unit applies a higher linear pressure for secondary pressing, compacting and sealing the film at the glass edges to form a closed structure and prevent gas backflow during the autoclave treatment stage.

[0040] In step S3 above, the heating temperature during the rolling process is controlled at 180±10℃. This temperature range keeps the PVB film in a viscous flow state.

[0041] When single-piece glass a 2a and single-piece glass b 2b are planar, the specific process of step S2 is as follows:

[0042] In a controlled clean environment, the PVB film tape 1 led out from the film tape storage roller is laid from one end to the other on the bonding surface of the monolithic glass 2a. At the same time as laying, pressure or airflow is applied to the PVB film tape end section 1a using a flattening device to remove residual gas between the interfaces and eliminate wrinkles, so that the PVB film tape end section 1a is flatly attached to the surface of the monolithic glass 2a.

[0043] Next, the single glass 2b is moved above the end segment 1a of the PVB film strip by the positioning device, and then overlapped with the single glass 2a after peripheral alignment, to obtain a three-layer composite sheet of single glass 2a, end segment 1a of PVB film strip and single glass 2b.

[0044] Then, the trimming device moves along the edge of the three-layer laminated sheet, cuts off the portion of the PVB film tape end segment 1a that extends beyond the glass edge, and makes the edge of the PVB film 1b formed after cutting flush with the edges of the single glass a 2a and the single glass b 2b.

[0045] like Figure 3As shown, when single-piece glass 2a (a) and single-piece glass 2b (b) are curved surfaces, this solution introduces linkage control to achieve wrinkle-free, stretch-free, and uniform bonding of the curved glass. The PVB film is precisely guided to spread naturally along the curved surface via a synthetic trajectory. The specific process of step S2 is as follows:

[0046] Two glass robotic arms respectively hold the convex arc surface of single glass piece 2b (b) and the concave arc surface of single glass piece 2a (a). With the precise movement of the robotic arms, the convex arc surfaces of single glass pieces 2b (b) and 2a (a) are both facing upwards. The vertical spacing between single glass pieces 2b (b) and 2a (a) is set, and their outlines are aligned when viewed from above.

[0047] Let the tangent at the counterclockwise end of the convex arc surface of the single glass piece 2a be the reference tangent 17; it also includes a linear telescopic unit 6 that is parallel to the upper side of the reference tangent 17 in the initial state. The linear telescopic unit 6 can be telescopically extended and retracted in control by the controller; the upper end of the linear telescopic unit 6 is vertically fixedly connected to the rotating unit 7, and it also includes a drive device that can precisely control the rotation of the rotating unit 7; the lower end of the linear telescopic unit 6 is connected to the clamping unit 13.

[0048] The left side of the single glass 2a is provided with a strip guide nozzle 5 with the outlet end facing the clamping unit 13. The end section of the PVB film strip 1 led out from the film strip storage roller passes through and is led out from the outlet end of the strip guide nozzle 5 in a direction parallel to the reference tangent 17.

[0049] In the initial state, the clamping unit 13 just clamps the end of the PVB film strip 1 that is ejected from the guide end of the strip nozzle 5, as shown. Figure 3 As shown in the image above; then perform the following three steps:

[0050] In the first step, the linear telescopic unit 6 retracts, and the end segment 1a of the PVB film strip, which is drawn from the outlet end of the strip guide nozzle 5 along the parallel direction of the reference tangent 17, gradually lengthens along the extension direction of the reference tangent 17 under the guidance of the clamping unit 13, until the length of the end segment 1a of the PVB film strip ejected from the strip guide nozzle 5 increases to match the arc length of the convex surface of the monolithic glass 2a, at which point the process stops. This action, through the precise displacement control of the linear telescopic unit, ensures that the length of the free segment of the pulled-out film is strictly equal to the arc length of the convex surface of the monolithic glass 2a, which is the geometric basis for non-stretch bonding.

[0051] Then the glass robotic arm controls the single glass piece 2a to move upwards until the counterclockwise end of the convex arc surface of the single glass piece 2a is tangent to the root of the end segment 1a of the PVB film tape ejected from the tape guide nozzle 5, at which point it pauses. Figure 3As shown in the figure below; at this time, the end segment 1a of the PVB film tape coincides with the reference tangent 17; this step is complete; this positioning ensures that the root of the film precisely matches the tangent of the curved end of the glass, ensuring that the subsequent attachment trajectory maintains the same curvature change as the curved surface contour, and avoiding cumulative deviations caused by misalignment of the starting point.

[0052] Define a reference ray 12 with the axis of rotation unit 7 as the base point. Based on the state at the end of this step, if the linear telescopic unit 6 swings downwards by a° around the rotation unit 7, the extension line of the linear telescopic unit 6 coincides with the reference ray 12, and the clamping unit 13 moves along the arc path 8 to point a 11 on the reference ray 12. There is also a point b 10 on the reference ray 12, with a distance L between point b 10 and point a 11. Point b 10 is located at the clockwise end near the single glass piece 2a. The reference ray 12, point a, and point b are pre-calculated based on the arc surface geometry parameters through inverse kinematics or obtained through CAD drawing. The CAD drawing is as follows: Figure 3 As shown, L represents the additional stretching amount at the end of the arc surface, ensuring the continuity and accuracy of the synthesized trajectory.

[0053] Step two: Control the linear telescopic unit 6 to slowly swing downwards by a° around the rotating unit 7, while simultaneously and precisely controlling the linear telescopic unit 6 to gradually extend by L; under the combined action of the swinging motion and the extension motion of the linear telescopic unit 6, the clamping unit 13 moves along... Figure 3 The composite trajectory line 9 shown in the figure below gradually moves to point b, position 10;

[0054] The synthetic trajectory line 9 is essentially a spiral curve that gradually approaches the counterclockwise end of the single glass piece 2a. It couples the rotation angle of the rotating unit with the amount of extension and retraction in real time, so that the increase in the length of the free adhesive segment from the clamping unit to the arc surface is always equal to the increase in the length of the attached arc.

[0055] Clamping unit 13 along as Figure 3 As the composite trajectory line 9 in the figure below gradually moves to point b (position 10), the end segment 1a of the PVB film tape gradually attaches to the convex arc surface of the single glass 2a in an arc shape, starting from its root and moving clockwise along the convex arc surface. Under the path constraint of the composite trajectory line 9, the end segment 1a of the PVB film tape maintains a tight shape without wrinkles or stretching deformation throughout the process of attaching to the convex arc surface of the single glass 2a in an arc shape, thus ensuring the overall uniformity of the final bonding state. This is due to the linkage control of the linear telescopic unit and the rotation unit, which makes the linear velocity of film bonding synchronized with the tangential velocity of the arc surface point in real time, completely eliminating shear deformation and additional stretching.

[0056] In step three, the single-piece glass 2b is slowly moved downwards until its convex arc surface aligns with and overlaps the concave arc surface of the PVB film strip end segment 1a, resulting in a three-layer composite sheet consisting of single-piece glass 2a, PVB film strip end segment 1a, and single-piece glass 2b. Then, a trimming device cuts the PVB film strip end segment 1a along the edge of the three-layer composite sheet, thus forming a uniformly spread arc-shaped PVB film 1b between single-piece glass 2a and single-piece glass 2b. During the lamination process, the curvature of the single-piece glass 2b perfectly matches that of the spread film and the single-piece glass 2b. After trimming, the resulting arc-shaped interlayer prefabricated component is free of air bubbles and has a uniform thickness, effectively avoiding optical distortion and localized stress concentration.

[0057] In step S4 above, the segmented temperature and pressure control process specifically includes:

[0058] Pressure and temperature rise stage: After closing and sealing the autoclave door, start the internal circulating fan and cooling water pump. Set the target pressure to 12±1kg, the target heating temperature to 135±10℃, and the cooling start temperature to 150℃. When the pressure inside the autoclave rises to 2~3kg, turn on the heating system. When the temperature and pressure are close to the set values, maintain the temperature and pressure for 10 minutes. Maintain the temperature at 100℃ to allow the PVB film to soften and rheologically transform, uniformly fill the micro-undulations and interfacial gaps on the glass surface, and further drive away the remaining trace gas from the bonding interface.

[0059] Medium temperature transition stage: Maintain the pressure inside the vessel at 12±1kg, control the heating temperature at 130℃~140℃, and when the temperature inside the vessel rises to 100℃, maintain the temperature and pressure for 10 minutes.

[0060] High-temperature curing stage: Maintain the pressure inside the autoclave at 12kg, control the heating temperature at 130℃~140℃, start timing when the temperature inside the autoclave reaches 140℃ and the pressure reaches 12kg, and keep the temperature and pressure for 1~2 hours.

[0061] Cooling and depressurization stage: Stop heating, start cooling water circulation for cooling, and set the cooling termination temperature to 50℃; when the temperature inside the reactor drops to 50℃, slowly open the exhaust valve to reduce the pressure inside the reactor to atmospheric pressure, completing the curing process. Slowly cooling to below 50℃ before depressurization prevents the film from foaming or developing micropores due to a sudden pressure drop, while also avoiding residual thermal stress in the glass due to rapid cooling, ensuring a flat and deformation-free finished product.

[0062] The monitoring parameters for laminated glass manufacturing processes are as follows:

[0063]

[0064] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A process for preparing PVB laminated glass, characterized in that, Using two pieces of cut and edge-ground white glass as starting materials, the preparation method includes the following steps: S1. The two original glass sheets are cleaned, rinsed and dried in sequence to obtain clean and stain-free glass sheets to be assembled; they are denoted as a single glass (2a) and b single glass (2b). S2. In a controlled clean environment, the end segment (1a) of the PVB film tape (1) led out from the film tape storage roller is spread on the bonding surface of the single glass a (2a). Then, the single glass b (2b) is aligned and stacked on top of the end segment (1a) of the PVB film tape to obtain a three-layer composite sheet of single glass a (2a), end segment (1a) of the PVB film tape, and single glass b (2b). Then, the trimming device cuts the end segment (1a) of the PVB film tape along the edge of the three-layer composite sheet, thereby forming a uniformly spread PVB film (1b) between single glass a (2a) and single glass b (2b). S3. The obtained three-layer laminated sheet is heated and softened and pressure treated to make the PVB film (1a) initially bonded to the glass and achieve edge sealing, thus obtaining a pre-pressed semi-finished product; S4. The pre-pressed semi-finished product is sent into the high-pressure autoclave. The temperature and pressure control process of segmented heating and pressurization, multi-stage heat preservation and pressure maintenance, and gradual cooling and pressure relief is adopted to melt the PVB film (1a) and form a firm bond with the glass surface.

2. The manufacturing process of PVB laminated glass according to claim 1, characterized in that: In step S1, the rinsing is performed by rinsing the glass surface with pure water with a conductivity of ≤20μS; the drying is performed by air-drying the glass with purified dry hot air at 40℃~60℃, and the dried glass is left to stand at room temperature for later use.

3. The manufacturing process of PVB laminated glass according to claim 1, characterized in that: In step S2, the temperature of the controlled clean environment is controlled at 20±5℃ and the relative humidity is controlled at 20%~40%; during the bonding process, the bonding surfaces of the glass and the film are kept clean and free of dust and impurities.

4. The manufacturing process of PVB laminated glass according to claim 1, characterized in that: In step S2, the cut size of the PVB film (1a) is larger than the glass size, with a 3-5mm allowance on all four sides.

5. The manufacturing process of PVB laminated glass according to claim 1, characterized in that: In step S3, a first heating chamber, a first pressurizing unit, a second heating chamber, and a second pressurizing unit are sequentially arranged along the conveying direction. The laminated sheet first enters the first heating chamber for preheating, completes the initial clamping and degassing through the first pressurizing unit, then enters the second heating chamber for heating to soften the PVB film, and completes the secondary clamping through the second pressurizing unit.

6. The manufacturing process of PVB laminated glass according to claim 1, characterized in that: In step S3, the heating temperature during the clamping process is controlled at 180±10℃.

7. The manufacturing process of PVB laminated glass according to claim 1, characterized in that: When single-piece glass a (2a) and single-piece glass b (2b) are planar, the specific process of step S2 is as follows: In the controlled clean environment, the PVB film tape (1) led out from the film tape storage roller is gradually laid from one end to the other on the bonding surface of the monolithic glass (2a). At the same time as laying, pressure or airflow is applied to the PVB film tape end section (1a) using a flattening device to remove residual gas between the interfaces and eliminate wrinkles, so that the PVB film tape end section (1a) is flatly attached to the surface of the monolithic glass (2a). Next, the single glass piece b (2b) is moved above the end segment (1a) of the PVB film strip by the positioning device, and is then aligned with the single glass piece a (2a) around the perimeter and stacked together to obtain a three-layer composite sheet of single glass piece a (2a), the end segment (1a) of the PVB film strip and single glass piece b (2b). Then, the trimming device moves along the edge of the three-layer laminated sheet to cut off the portion of the PVB film tape end section (1a) that extends beyond the glass edge, and makes the edge of the PVB film (1b) formed after cutting flush with the edges of the a single glass (2a) and the b single glass (2b).

8. The manufacturing process of PVB laminated glass according to claim 1, characterized in that: When single-piece glass a (2a) and single-piece glass b (2b) are curved surfaces, the specific process preparation for step S2 is as follows: Make the convex arc surfaces of both single-pane glass (2b) and single-pane glass (2a) face upwards, set the vertical spacing between single-pane glass (2b) and single-pane glass (2a), and align their outlines when viewed from above. Let the tangent at the counterclockwise end of the convex arc surface of the single glass piece (2a) be the reference tangent (17); it also includes a linear telescopic unit (6) that is parallel to the upper side of the reference tangent (17) in the initial state; the upper end of the linear telescopic unit (6) is connected to the rotating unit (7), and it also includes a drive device that can precisely control the rotation of the rotating unit (7); the lower end of the linear telescopic unit (6) is connected to the clamping unit (13). The left side of the single glass (2a) is provided with a strip guide nozzle (5) with the outlet end facing the clamping unit (13). The end section of the PVB film strip (1) led out from the film strip storage roller passes through and is led out from the outlet end of the strip guide nozzle (5) in a direction parallel to the reference tangent (17). In the initial state, the clamping unit (13) just clamps the end of the PVB film tape (1) that is ejected from the lead end of the tape guide (5).

9. The manufacturing process of PVB laminated glass according to claim 8, characterized in that: The specific process for step S2 is as follows: In the first process, the linear telescopic unit (6) retracts, and the end segment (1a) of the PVB film strip, which is led out from the outlet end of the strip guide (5) along the parallel direction of the reference tangent (17), gradually becomes longer along the extension direction of the reference tangent (17) under the guidance of the clamping unit (13) until the length of the end segment (1a) of the PVB film strip ejected from the strip guide (5) increases to be compatible with the convex arc length of the single glass (2a). Control the upward displacement of the single glass piece (2a) until the counterclockwise end of the convex arc surface of the single glass piece (2a) is tangent to the root of the end section (1a) of the PVB film tape ejected from the tape guide nozzle (5), then pause; at this time, the end section (1a) of the PVB film tape coincides with the reference tangent line (17); this step ends. Define a reference ray (12) with the axis of the rotating unit (7) as the base point. Based on the state at the end of this step, if the linear telescopic unit (6) swings down a° around the rotating unit (7), the extension line of the linear telescopic unit (6) just coincides with the reference ray (12), and the clamping unit (13) just moves along the arc path (8) to point a (11) on the reference ray (12); there is also a point b (10) on the reference ray (12), and the distance between point b (10) and point a (11) is L; point b (10) is located at the clockwise end near the single glass piece (2a); Step 2: Control the linear telescopic unit (6) to swing downwards by a° around the rotating unit (7), and the linear telescopic unit (6) gradually extends by L; under the combined action of the swinging motion and the extension motion of the linear telescopic unit (6), the clamping unit (13) gradually moves to point b (10) along the composite trajectory line (9); during the process of the clamping unit (13) gradually moving to point b (10) along the composite trajectory line (9), the end section (1) of the PVB film tape... a) Starting from the root, the PVB film tape gradually attaches to the convex arc surface of the single glass (2a) in an arc shape along the clockwise path. Under the path constraint of the composite trajectory line (9), the PVB film tape end segment (1a) gradually attaches to the convex arc surface of the single glass (2a) in an arc shape along the clockwise path of the single glass (2a) starting from the root. During this process, the PVB film tape end segment (1a) always maintains a tight shape that is neither wrinkled nor stretched. Step 3: Control the single glass piece (2b) to slowly move downwards until the convex arc surface of the single glass piece (2b) is aligned and stacked on the concave arc surface of the end section (1a) of the PVB film strip, thus obtaining a three-layer composite sheet consisting of single glass piece (2a), end section (1a) of the PVB film strip, and single glass piece (2b).

10. The manufacturing process of PVB laminated glass according to claim 1, characterized in that: In step S4, the segmented temperature and pressure control process specifically includes: Pressure and temperature rise stage: After closing and sealing the autoclave door, start the internal circulation fan and cooling water pump. Set the target pressure to 12±1kg, the target heating temperature to 135±10℃, and the cooling start temperature to 150℃. When the pressure inside the autoclave rises to 2~3kg, turn on the heating system. When the temperature and pressure are close to the set values, maintain the temperature and pressure for 10 minutes. Medium temperature transition stage: Maintain the pressure inside the vessel at 12±1kg, control the heating temperature at 130℃~140℃, and when the temperature inside the vessel rises to 100℃, maintain the temperature and pressure for 10 minutes. High-temperature curing stage: Maintain the pressure inside the autoclave at 12kg, control the heating temperature at 130℃~140℃, start timing when the temperature inside the autoclave reaches 140℃ and the pressure reaches 12kg, and keep the temperature and pressure for 1~2 hours. Cooling and depressurization stage: Stop heating, start cooling water circulation to cool down, and set the cooling termination temperature to 50℃; when the temperature inside the reactor drops to 50℃, slowly open the exhaust valve to reduce the pressure inside the reactor to atmospheric pressure, and complete the curing.

Images