Preparation method of laminated glass

Abstract

The invention relates to a preparation method of laminated glass. The preparation method comprises the following steps: S1, obtaining initial laminated glass; s2, the initial laminated glass is transferred to a heating furnace, a plurality of convection mechanisms are arranged in the heating furnace, the initial convection frequency set values of all the convection mechanisms are the same, and the initial laminated glass is divided into a first part and a second part in the conveying direction of the initial laminated glass; in the heating furnace, when the first part of the initial laminated glass passes through each convection mechanism, the convection frequency of the convection mechanism is an initial convection frequency set value; when the second part of the initial laminated glass passes through each convection mechanism, only the convection frequency of the convection mechanism corresponding to the second part is reduced, and when the second part is far away from the convection mechanism, the convection frequency of the convection mechanism returns to an initial convection frequency set value; and S3, rolling to obtain the laminated glass. According to the method provided by the invention, the film is not bonded with the two pieces of glass in advance before rolling, so that gas can be smoothly discharged, and meanwhile, the edge sealing effect is kept.

Description

Technical Field

[0001] This invention belongs to the field of glass preparation, and specifically relates to a method for preparing laminated glass. Background Technology

[0002] Laminated glass is a composite glass product made by bonding two or more panes of glass together with polyvinyl butyral (PVB) film between the panes through preheating and pressing or by vacuuming, heating, and pressurizing. Due to its high safety and sound and UV insulation properties, laminated glass is widely used in curtain wall glass.

[0003] The fabrication process of laminated glass is as follows: First, a PVB film is placed between two pieces of glass, and then it is fed into a heating furnace for heating via thermal radiation or forced convection. After the PVB film is heated to approximately 60°C, the laminated glass is rolled to expel the air between the film and the glass. Rolling not only bonds the laminated glass and removes air, but also seals the edges to prevent air from re-entering the interlayer. After rolling, the laminated glass is sent to an autoclave for high-temperature and high-pressure treatment, further crushing and dissolving any remaining air bubbles into the film, thus bonding the PVB film to the two pieces of glass.

[0004] During the degassing process in roll forming, the glass moves forward through the pressure rollers. Some of the air between the PVB film and the glass is expelled along the glass conveyor edges, while some air is rolled to the tail end of the glass, causing gas accumulation there. When the film temperature at the tail end rises to the point where it bonds with the glass, it hinders the outward escape of the accumulated gas. If the film cannot completely dissolve the remaining gas, bubbles will form between the film and the glass. Traditional methods reduce adhesion by lowering the temperature of the glass and film during roll forming, but this lowers the overall temperature of the laminated glass and weakens the sealing effect around the glass edges. Summary of the Invention

[0005] The purpose of this invention is to provide a method for preparing laminated glass.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows: A method for preparing laminated glass, the method comprising: S1. Lay a film between the two glass sheets to obtain the initial laminated glass; S2. The initial laminated glass from step S1 is transferred to a heating furnace. The heating furnace is equipped with multiple convection mechanisms distributed along the glass moving direction. All convection mechanisms have the same initial convection frequency setting. The glass on the initial laminated glass is divided into a first part and a second part along its conveying direction. The length of the second part is less than the length of the first part. The first part enters the heating furnace before the second part. Inside the heating furnace, when the first portion of the initial laminated glass passes through each convection mechanism, the convection frequency of the convection mechanism is the initial convection frequency setting value; when the second portion of the initial laminated glass passes through each convection mechanism, only the convection frequency of the convection mechanism corresponding to the second portion decreases, and when the second portion moves away from the convection mechanism, the convection frequency of the convection mechanism returns to the initial convection frequency setting value; In step S3 and S2, the initial laminated glass is removed from the heating furnace and enters the rolling zone. After passing through the pressure rollers in the rolling zone, the desired laminated glass is obtained.

[0007] According to some embodiments of the present invention, in step S2, the length of the second portion is less than or equal to 30% of the length of the initial laminated glass. Preferably, the length of the second portion is less than or equal to 20% of the length of the initial laminated glass.

[0008] According to some embodiments of the present invention, in step S2, when the second portion of the initial laminated glass passes through the convection mechanism, the convection frequency of the convection mechanism is reduced to H. i H i It can be obtained through the following formula: H i =H 设 +H 设 ×(T 设定温差 -T 实际温差 ) / T 头部设定温度 , T 设定温差 =T 尾部设定温度 -T 头部设定温度 , T 实际温差 =T 尾部实际温度 -T 头部实际温度 , Among them, H 设 T is the initial convection frequency setting value for the convection mechanism. 头部设定温度 T is the set temperature at the beginning of the initial laminated glass roll at the head of the pressure roller. 头部实际温度 T represents the actual temperature of the initial laminated glass head at the starting end of the pressure roller; 尾部设定温度 T is the set temperature at the beginning of the pressure roller for the tail end of the same initial laminated glass. 尾部实际温度 T represents the actual temperature at the tail end of the same laminated glass at the starting end of the pressure roller; 实际温差 The initial default value is 0.

[0009] According to some embodiments of the present invention, in step S3, if T 实际温差 <T 设定温差 ±a℃, then for the next initial laminated glass in the heating furnace H i Make adjustments, H iIt can be obtained through the following formula: H i =H i-1 +H i-1 ×(T 设定温差 -T 实际温差 ) / T 头部实际温度 , Among them, H i-1 The convection frequency value is the value after the convection frequency of the previous initial laminated glass in the convection mechanism of the heating furnace is reduced.

[0010] According to some embodiments of the present invention, a is 2.

[0011] According to some embodiments of the present invention, in step S3, an initial speed setting value for the rolling zone is first set. When the first part of the initial laminated glass passes through the pressure roller, the speed of the rolling zone is the initial speed setting value. When the second part of the initial laminated glass passes through the pressure roller, the speed of the rolling zone corresponding to the second part is reduced.

[0012] According to some embodiments of the present invention, in step S2, when the second portion of the initial laminated glass passes through the pressure roller, the speed of the roller pressing zone is reduced to S. 变 S 变 It can be obtained through the following formula: S 变 ={S 设定走速 +S 设定走速 ×(T 设定温差 -T 实际温差 ) / T 头部设定温度}×q, T 设定温差 =T 尾部设定温度 -T 头部设定温度 , T 实际温差 =T 尾部实际温度 -T 头部实际温度 , Among them, T 头部设定温度 T is the set temperature at the beginning of the initial laminated glass roll at the head of the pressure roller. 头部实际温度 T represents the actual temperature of the initial laminated glass head at the starting end of the pressure roller; 尾部设定温度 T is the set temperature at the beginning of the pressure roller for the tail end of the same initial laminated glass. 尾部实际温度 T represents the actual temperature at the tail end of the same laminated glass at the starting end of the pressure roller; 实际温差 The initial default value is 0, the initial default value of q is 1, and the initial default value of T is 0. 实际温差 The initial default value is 0.

[0013] According to some embodiments of the present invention, if the roll forming transparency effect of the laminated glass tail end is inconsistent with that of its head end after roll forming, then q is reduced.

[0014] According to some embodiments of the present invention, the adjusted q is greater than or equal to 0.4 and less than 1. Preferably, q can be 0.5, 0.6, 0.7, or 0.8.

[0015] According to some embodiments of the present invention, in step S3, before rolling, the temperature range of the initial laminated glass head at the starting end of the pressure roller is 55-75°C, and / or, the initial convection frequency setting value of the convection mechanism is 35-45Hz.

[0016] According to some embodiments of the present invention, in step S2, when the second part of the initial laminated glass passes through each convection mechanism, the convection frequency of the convection mechanism corresponding to the second part is reduced to 1-20% of its initial convection frequency setting value. Preferably, the convection frequency of each convection mechanism is reduced to 5-10% of its initial convection frequency setting value, more preferably 10%.

[0017] Or, in step S3, when the second part of the initial laminated glass passes through the pressure roller, the speed of the roller pressing zone corresponding to the second part is reduced to 1-20% of the initial speed setting value of the roller pressing zone. Preferably, the speed of the roller pressing zone is reduced to 5-10% of the initial speed setting value of the roller pressing zone, and more preferably to 10%.

[0018] Due to the application of the above technical solution, the present invention has the following advantages compared with the prior art: The laminated glass manufacturing method provided by this invention reduces the temperature of the second part of the initial laminated glass by controlling forced convection according to the initial laminated glass position, so that the film of the second part of the initial laminated glass does not bond with the two glass before rolling, allowing the gas in the second part of the initial laminated glass to be discharged smoothly while maintaining the edge sealing effect; when the second part of the initial laminated glass passes through the pressure roller, the speed of the rolling zone is reduced to increase the rolling time of the second part of the initial laminated glass, so that the second part can be fully and firmly bonded. Attached Figure Description

[0019] Appendix Figure 1 This is a structural diagram of the heating furnace used in step S2 of the initial laminated glass of the present invention.

[0020] Appendix Figure 2 This is a structural diagram of the initial laminated glass of the present invention in the rolling zone of step S3; Appendix Figure 3 This is a structural diagram of the convection mechanism of the present invention; Appendix Figure 4 This is a structural diagram of the head of the initial laminated glass of the present invention at the starting end of the rolling zone in step S3; Appendix Figure 5This is a structural diagram of the tail end of the initial laminated glass of the present invention at the starting end of the rolling zone in step S3; Appendix Figure 6 This is a structural diagram of the initial laminated glass of the present invention.

[0021] In the attached diagrams above: 1-Photoelectric sensor; 2-Initial laminated glass; 21-Glass; 22-Film; 3-Rotating blade; 4-Conveyor roller; 5-Pressure roller; 6-Heating component; 7-Convection exhaust fan; 8-Motor; 9-Heating furnace. Detailed Implementation

[0022] The present invention will be further described below with reference to the embodiments shown in the accompanying drawings.

[0023] Example 1 This example provides a method for preparing laminated glass, the method including: S1. PVB film 22 is laid between two cleaned glass sheets with a thickness of 6 mm and a size of 1000×2000 mm to obtain the initial laminated glass 2. S2. The initial laminated glass 2 is divided into a first part and a second part along its conveying direction. The length of the first part is four-fifths of the length of the initial laminated glass 2, and the length of the second part is one-fifth of the length of the initial laminated glass 2. The first part enters the heating furnace before the second part.

[0024] The heating furnace 9 is equipped with multiple convection mechanisms distributed along the glass movement direction. Referring to the figure, each convection mechanism includes two opposing convection components. These two components are positioned opposite each other and directly opposite each other, located on opposite sides of the two glass panes. Each convection component includes a convection exhaust 7, a motor 8, and rotating blades 3. The convection exhaust 7 has a receiving space with an air inlet and an air outlet. A heating element 6 is installed within this space. The rotating blades 3 are located within the receiving space of the convection exhaust 7. The motor 8 is connected to the rotating blades 3 to drive their rotation, thus changing the convection magnitude. The rotating blades 3 are positioned near the air inlet, and the heating element is positioned near the air outlet, which faces the glass. The heating element 6 heats the flowing gas entering the receiving space through the air inlet, and the rotating blades 3 discharge the hot gas through the air outlet onto the glass.

[0025] A photoelectric sensor 1 is installed inside the heating furnace 9. The photoelectric sensor 1 is used to sense the glass and simultaneously calculate the real-time position of the initial laminated glass 2 in the heating furnace 9 by measuring the conveying speed.

[0026] In this step, the initial speed of the laminated glass 2 within the heating furnace 9 is 2.8 m / min. The initial convection frequency setting for all motors of the convection mechanisms is the same. Specifically, the temperature of the heating furnace 9 is set to 200℃, and the initial convection frequency setting for the convection mechanisms is set to H. 设定 The frequency is set to 40Hz, and the temperature difference T between the head end of the initial laminated glass 2 at the starting end of the pressure roller 5 in the rolling zone and the tail end at the starting end of the pressure roller 5 is set to 40Hz. 设定温差 (The rolling zone is located adjacent to the outlet of the heating furnace 9. The initial laminated glass 2 exiting the outlet of the heating furnace 9 has a temperature T when its head passes the starting end of the pressure roller 5 in the rolling zone.) 头部设定温度 T 头部设定温度 The initial laminated glass 2, at 65°C, continues to move after its head contacts the pressure roller 5. When the tail of the initial laminated glass 2 passes the starting end of the pressure roller 5 in the rolling zone, the temperature T... 尾部设定温度 T 尾部设定温度 The temperature is 57℃, T 设定温差 =T 尾部设定温度 -T 头部设定温度 ), T 设定温差 The temperature is -8℃.

[0027] In this step, the long side of the initial laminated glass 2 from step S1 is conveyed into the heating furnace 9 parallel to the transmission direction. When the first part of the initial laminated glass 2 passes through each convection mechanism, the convection frequency of the convection mechanism is the initial convection frequency setting value; when the second part of the initial laminated glass 2 passes through the convection mechanism, the convection frequency of the convection mechanism is reduced to H. i , like Figure 1 From the glass inlet to the glass outlet of the self-heating furnace, motors A (near the inlet), B, C, D, E, F, and G (near the outlet) are distributed sequentially. The first part of the laminated glass 2 passes through all motors in sequence. When the second part of the initial laminated glass 2 passes through motor A first, the convection frequency of A decreases to H. i The convection frequencies of B, C, D, E, F, and G remain unchanged. Then, when the second part of the initial laminated glass 2 passes through motor B, the convection frequency of motor B decreases to H. i After motor A no longer corresponds to the second part, the convection frequency of A returns to the initial convection frequency setting value. C, D, E, F, and G are the initial convection frequency setting values. Then, when the second part of the initial laminated glass 2 passes through motor C, the convection frequency of C decreases to H. i A, D, E, F, and G are the initial convection frequency settings. After motor B no longer corresponds to the second part, the convection frequency of B returns to the initial convection frequency setting. Next, when the second part of the initial laminated glass 2 passes motor D, the convection frequency of D decreases to H. iA, B, E, F, and G are the initial convection frequency settings. After motor C no longer corresponds to the second part, the convection frequency of C returns to the initial convection frequency setting, and so on. That is, only when the second part of the initial laminated glass passes through a certain convection mechanism will the convection frequency of that convection mechanism decrease, while the convection frequency of convection mechanisms that do not correspond to the second part (the second part does not pass through) remains unchanged.

[0028] H i It can be obtained through the following formula: H i =H 设 +H 设 ×(T 设定温差 -T 实际温差 ) / T 头部设定温度 =40+40×(-8-0) / 65=35(Hz).

[0029] In the above formula, T 实际温差 The initial default value is 0.

[0030] S3. In step S2, the initial laminated glass 2 is removed from the heating furnace 9 and enters the rolling zone. After passing through the pressure rollers in the rolling zone, the desired laminated glass is obtained after rolling. The initial running speed of the rolling zone is set to 2.8 m / min.

[0031] When the first part of the initial laminated glass 2 passes through the pressure roller, the speed in the roller pressing zone is 2.8 m / min. Then, when the second part of the glass passes through the pressure roller, the speed in the roller pressing zone corresponding to the second part is adjusted to S. 变 S 变 =S 设定走速 +S 设定走速 ×(T 设定温差 -T 实际温差 ) / T 头部设定温度 ×q=2.8+2.8×(-8-0) / 65×1=2.46m / min.

[0032] After the rolling process is completed, T 头部实际温度 The temperature was 64℃, T 实际尾部温度 At 60℃, T 实际温差 -4℃, T 设定温差 -8℃ ， T 设定温差 The absolute value of ±2℃ is a minimum of 6 and a maximum of 10. (T) 实际温差 The absolute value is 4. Since 4 is less than 6 and 10, the convection frequency of the convection mechanism needs to be adjusted. The adjusted convection frequency H of the convection mechanism is... i H i =H i-1 +H i-1 ×(T 设定温差 -T 实际温差 ) / T头部实际温度 =35+35×(-8-(-4)) / 64=32.8(Hz), where H i-1 The convection frequency value is the reduced value of the convection mechanism of the previous initial laminated glass 2 in the heating furnace 9, which is also the convection frequency of the second part of the initial laminated glass 2 in the heating furnace 9 in step S2 of the previous preparation process.

[0033] In step S2, when the second part of the initial laminated glass 2 passes through the convection mechanism, the purpose of reducing the convection frequency of the convection mechanism is to avoid the PVB film temperature from becoming too high, causing the film to bond prematurely with the glass, which is not conducive to the gas discharge of the second part of the glass. In step S3, when the second part of the initial laminated glass 2 passes through the pressure roller, the purpose of reducing the speed of the roller pressing area is to extend the roller pressing time so that the film and the glass can be fully and firmly bonded.

[0034] Example 2 This embodiment follows from Embodiment 1.

[0035] Step S1 in this example is the same as step S1 in Example 1.

[0036] The difference is: S2. When the new initial laminated glass (different from the initial laminated glass in step S2 of Example 1) enters the heating furnace, the convection speed of the convection fan corresponding to the first part of the initial laminated glass is 40 Hz, and the convection speed of the convection fan corresponding to the second part of the initial laminated glass is 32.8 Hz.

[0037] S3. After heating, the rolling stage begins. The rolling speed along the first part of the initial laminated glass is 2.8 m / min. After the first part of the glass is rolled, the rolling speed corresponding to the second part of the initial laminated glass is S. 变化走速 :S 变化走速 ={S 设定走速 +S 设定走速 ×(T 设定温差 -T 实际温差 ) / T 头部设定温度}×q={2.8+2.8×(-8-0) / 65}×1=2.46m / min.

[0038] In this step, T 实际头部温度 =64℃, T 实际尾部温度 =58℃, satisfying T 设定温差 The temperature is |-8℃±2℃|. However, the transparency effect of the roll forming at the tail end of the glass is inconsistent with that at the front end. Therefore, when preparing the next set of laminated glass, q is adjusted to 0.8.

[0039] Example 3 This embodiment follows embodiment 2.

[0040] Step S1 in this example is the same as step S1 in Example 1.

[0041] The difference is: S2. When the new initial laminated glass (different from the initial laminated glass in step S2 of Examples 1 and 2) enters the heating furnace, the initial convection magnitude of the convection mechanism corresponding to the first part of the initial laminated glass is 40 Hz, and the convection magnitude of the convection mechanism corresponding to the second part of the initial laminated glass is 27.2 Hz.

[0042] S3. After heating, the glass enters the rolling zone. When the first part of the initial laminated glass passes through the pressure rollers, the rolling speed in the rolling zone is 2.8 m / min. When the second part of the initial laminated glass then passes through the pressure rollers, the rolling speed in the rolling zone decreases to S. 变 S 变 ={S 设定走速 +S 设定走速 ×(T 设定温差 -T 实际温差 ) / T 头部设定温度}×q={2.8+2.8×(-8-0) / 65}×0.8=1.96m / min.

[0043] After rolling, the air is vented smoothly, and the transparency of the laminated glass is consistent at both the head and tail.

[0044] In Examples 1-3, since the main heating method of the convection furnace is convection heating, controlling the magnitude of forced thermal convection can quickly and effectively adjust the heating rate of the laminated glass. By changing the heating rate in different areas, the local temperature can be changed. By reducing the heating rate at the tail end of the laminated glass, the gas at the tail end can be better discharged. Comparative Example The difference from Examples 1-3 is: In step S2, the convection frequency of the convection mechanism inside the heating furnace is always 40Hz.

[0045] In step S3, the travel speed in the roller pressing zone is always 2.8 m / min.

[0046] Performance testing The laminated glass of Examples 1-3 were subjected to a boiling water test in accordance with the standard GBT 15763.3-2025. The specific test procedure was as follows: the laminated glass was baked at 100°C for 16 hours, and then removed and the number of bubbles and the distance of the bubbles from the edge of the laminated glass were observed.

[0047] Compared with the comparative examples, Examples 1-3 show a decrease in the number of bubbles and a decrease in the distance between the bubbles and the edge of the glass.

[0048] Regarding the distance between the bubbles and the glass edge in the glass where bubbles appear, in Example 1 the distance between the bubbles and the glass edge is reduced by 3 mm compared to the comparative example, in Example 2 the distance between the bubbles and the glass edge is reduced by 5 mm compared to the comparative example, and in Example 3 the distance between the bubbles and the glass edge is reduced by 6 mm compared to the comparative example.

[0049] Regarding the number of bubbles appearing in the glass, Example 1 reduced it by 15% compared to the comparative example, Example 2 reduced it by 30-35% compared to the comparative example, and Example 3 reduced it by 35-45% compared to the comparative example.

[0050] The transparency of the laminated glass at the head and tail of Examples 1-3 was obtained by haze testing. If the difference between the haze value at the head and the haze value at the tail of the laminated glass meets a certain range, it indicates that the transparency is consistent, which means that the air venting is smooth.

[0051] The above embodiments are only for illustrating the technical concept and features of the present invention, and are intended to enable those skilled in the art to understand the content of the present invention and implement it accordingly. They should not be construed as limiting the scope of protection of the present invention. All equivalent changes or modifications made in accordance with the spirit and essence of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A method for producing a laminated glass, characterized by, The preparation method comprises: S1, laying a film between two glass sheets to obtain an initial laminated glass; S2, transferring the initial laminated glass of step S1 to a heating furnace, wherein a plurality of convection mechanisms are arranged in the heating furnace, the plurality of convection mechanisms are distributed along the glass movement direction, the initial convection frequency setting values of all the convection mechanisms are the same, the initial laminated glass is divided into a first part and a second part along its conveying direction, the length of the second part is less than the length of the first part, and the first part enters the heating furnace earlier than the second part; In the heating furnace, when the first part of the initial laminated glass passes through each convection mechanism, the convection frequency of the convection mechanism is the initial convection frequency setting value; when the second part of the initial laminated glass passes through each convection mechanism, only the convection frequency of the convection mechanism corresponding to the second part is reduced, and when the second part is away from the convection mechanism, the convection frequency of the convection mechanism returns to the initial convection frequency setting value; S3, the initial laminated glass in step S2 moves out of the heating furnace into a rolling area, and then passes through a compression roller in the rolling area, and the required laminated glass is obtained after rolling.

2. The method for producing laminated glass according to claim 1, characterized by, In step S2, as the second portion of the initial laminated glass passes through the convection mechanism, the convection frequency of the convection mechanism is reduced to H i , H i is obtained by the following equation: H i =H 设 +H 设 ×(T 设定温差 -T 实际温差 ) / T 头部设定温度 , T 设定温差 =T 尾部设定温度 -T 头部设定温度 , T 实际温差 =T 尾部实际温度 -T 头部实际温度 , wherein H 设 is a set value of the initial convection frequency of the convection mechanism, T 头部设定温度 is a set temperature of the head of the initial laminated glass at the start end of the press roll, T 头部实际温度 is an actual temperature of the head of the initial laminated glass at the start end of the press roll; T 尾部设定温度 is a set temperature of the tail of the same initial laminated glass at the start end of the press roll, T 尾部实际温度 is an actual temperature of the tail of the same laminated glass at the start end of the press roll.

3. The method of claim 2, wherein the method is performed at a temperature of 100 to 200°C. In step S3, if T 实际温差 <T 设定温差 ± a °C, then the next initial laminated glass is adjusted in the heating furnace H i by the following formula: H i = H + a H i =H i-1 +H i-1 ×(T 设定温差 -T 实际温差 ) / T 头部实际温度 , where H i-1 is the convective frequency value of the previous initial laminated glass in the furnace after the reduction of the convective frequency of the convection mechanism of the furnace.

4. The method of claim 3, wherein the method is performed at a temperature of 100 to 200°C. a is 2.

5. The method of producing laminated glass according to any one of claims 1 to 4, characterized in that, In step S3, the initial speed setting value of the rolling area is first set, when the first part of the initial laminated glass passes through the compression roller, the speed of the rolling area is the initial speed setting value; when the second part of the initial laminated glass passes through the compression roller, the speed of the rolling area corresponding to the second part is reduced.

6. The method of claim 5, wherein the method is performed at a temperature of 100 to 200°C. In step S2, the speed of the roller nip is reduced to S 变 , S 变 is obtained by the following equation: S 变 ={S 设定走速 +S 设定走速 ×(T 设定温差 -T 实际温差 ) / T 头部设定温度}×q, T 设定温差 =T 尾部设定温度 -T 头部设定温度 , T 实际温差 =T 尾部实际温度 -T 头部实际温度 , wherein T 头部设定温度 is the set temperature of the head of the initial laminated glass at the start of the press roll, T 头部实际温度 is the actual temperature of the head of the initial laminated glass at the start of the press roll; T 尾部设定温度 is the set temperature of the tail of the same initial laminated glass at the start of the press roll, T 尾部实际温度 is the actual temperature of the tail of the same laminated glass at the start of the press roll.

7. The method of claim 5, wherein the method is performed at a temperature of 100 to 200°C. After rolling, if the rolling transparent effect of the tail part of the laminated glass is inconsistent with that of the head part, q is reduced.

8. The method of claim 7, wherein the method is performed at a temperature of 100 to 200°C. The adjusted q is greater than or equal to 0.4 and less than 1.

9. The method of claim 1, wherein the method is performed at a temperature of 100 to 300 °C. In step S2, the length of the second part is less than or equal to 20% of the length of the initial laminated glass; And / or, in step S3, before rolling, the temperature of the head part of the initial laminated glass located at the starting end of the compression roller is in the range of 55-75℃, and / or the initial convection frequency setting value of the convection mechanism is in the range of 35-45HZ.

10. The method of claim 5, wherein the method is performed at a temperature of 100 to 200 °C. In step S2, when the second part of the initial laminated glass passes through each convection mechanism, the convection frequency of the convection mechanism corresponding to the second part is reduced to 1-20% of the initial convection frequency setting value, and / or in step S3, when the second part of the initial laminated glass passes through the compression roller, the speed of the rolling area corresponding to the second part is reduced to 1-20% of the initial speed setting value of the rolling area.

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