Autoclaved laminating device of laminated glass and preparation method of laminated glass

Abstract

The invention relates to an autoclaved laminating device of laminated glass and a preparation method of the laminated glass, the autoclaved laminating device of the laminated glass comprises a vacuum bag, the vacuum bag is used for placing the laminated glass, the vacuum bag is connected with a first vacuum pump through a first exhaust pipe, the vacuum bag is arranged in a sealing device, and the first exhaust pipe is connected with a second vacuum pump through a second exhaust pipe. The first exhaust pipe penetrates through a sealing device and then is connected with the vacuum bag, a valve is arranged on the sealing device, and the sealing device is connected with a second vacuum pump through a second exhaust pipe. The sealing device is arranged on the outer layer of the vacuum bag, and the inner surface and the outer surface of the vacuum bag are synchronously vacuumized, so that the rubber sheet is not stressed in the vacuumizing link, and the air guide lines of the rubber sheet exhaust smoothly, so that the aims of quickly and smoothly exhausting air in a cementing layer and avoiding residual gas retention are fulfilled; and the phenomena of degumming and bubbles of the laminated glass caused by residual gas are prevented.

Description

Technical Field

[0001] The invention relates to the field of laminated glass production, in particular to a laminated glass steam pressing laminating device and a laminated glass preparation method. Background Art

[0002] Laminated glass, also known as glued glass, is widely used in airplanes, trains, and buildings due to its excellent safety performance. Laminated glass is divided into various types, such as tempered glass laminated glass, ordinary float glass laminated glass, flat laminated glass, curved laminated glass, laminated glass of the same material, laminated glass of different materials, etc. The production of various types of laminated glass is inseparable from the intermediate layer material, commonly known as film.

[0003] The principle of laminated glass is to connect two or more pieces of glass or other materials together at high temperature using the adhesive properties of film to make them a whole. Common failures of laminated glass are delamination and the appearance of bubbles between layers. The manufacturing quality of curved laminated glass mainly depends on whether the optical distortion performance is qualified.

[0004] In the preparation process of laminated glass, glass will be bent by heat. When the glass is bent by heat, there will be different degrees of inconsistency in the glass surface. The thickness of the film is relatively consistent, which will cause the film to be locally compressed during autoclaving and lamination. The local compression will produce inherent stress, which will cause the film's refractive index to change greatly, affecting the optical distortion of the product. When the laminated glass is used later, the stress will be gradually released, causing delamination and debonding. In order to extract the residual gas in the bonding layer before autoclaving and lamination, the film is provided with air guide grooves. After the multi-layer glass and the film are stacked in the autoclave, a vacuum sealing device is required to extract the gas in the sealing device, and then increase the temperature and pressure to achieve the purpose of autoclaving and lamination at the elastic state or viscous flow state temperature of the film. In the vacuuming process, due to the pressure of the atmospheric pressure in the autoclave, the air guide grooves of the film are compressed, and the residual gas in the bonding layer cannot be smoothly extracted by the vacuum pump, resulting in a large amount of residual gas. In the later use process, the residual gas is likely to cause debonding and bubbles in the laminated glass. To achieve stress-free or low stress between the layers of laminated glass and improve the optical performance, it is necessary to use the lateral movement of the film to make up for the different gaps between the glasses. However, during the glass steaming process, the positive pressure of the vacuum and the autoclave is continuously applied to the vacuum sealing device, and this pressure is directly transmitted to the inner and outer surfaces of the laminated glass. At this time, the film is in an elastic state or viscous flow temperature, and the lateral movement of the film becomes extremely difficult due to the pressure on the inner and outer surfaces. As a result, the prepared laminated glass has poor optical properties or debonding at a later stage. Summary of the invention

[0005] The main purpose of the present invention is to provide a laminated glass steaming laminating device which can avoid debonding and bubbles in the prepared laminated glass.

[0006] To achieve the above purpose, the technical solution adopted by the present invention is as follows:

[0007] A steam pressing lamination device for laminated glass comprises a vacuum bag, wherein the laminated glass is placed inside the vacuum bag, the vacuum bag is connected to a first vacuum pump via a first exhaust pipe, the vacuum bag is arranged in a sealing device, the first exhaust pipe passes through the sealing device and is connected to the vacuum bag, a valve is provided on the sealing device, and the sealing device is connected to a second vacuum pump via a second exhaust pipe.

[0008] The valve is an automatic control valve.

[0009] The present invention also provides a method for preparing laminated glass using the steam pressing laminating device for laminated glass, comprising the following steps:

[0010] (1) Glass matching:

[0011] Select at least two pieces of glass;

[0012] (2) Lamination:

[0013] Place film between two sheets of glass;

[0014] (3) Place in vacuum bag:

[0015] The laminated glass is placed in a vacuum bag, and the vacuum bag is placed in a sealing device;

[0016] (4) Place in autoclave:

[0017] Put the sealing device containing the glass into the autoclave, lead the first exhaust pipe out of the autoclave and connect it to the first vacuum pump, and lead the second exhaust pipe out of the autoclave and connect it to the second vacuum pump;

[0018] (5) Air extraction:

[0019] Simultaneously start the first vacuum pump and the second vacuum pump to synchronously evacuate the inner and outer surfaces of the vacuum bag, keep the pressure inside and outside the vacuum bag consistent, and increase the temperature and pressure of the autoclave;

[0020] (6) Heat preservation and pressure maintenance:

[0021] Maintaining the temperature and pressure in the autoclave;

[0022] (7) Cooling and pressure relief:

[0023] Cool down and depressurize the autoclave, and then turn off the first vacuum pump;

[0024] (8) Remove the laminated glass:

[0025] The sealed device is taken out from the autoclave, and the laminated glass in the vacuum bag is taken out.

[0026] Furthermore, when the pressure in the vacuum bag and the sealing device reaches a first preset value, the temperature of the autoclave is increased. When the temperature of the autoclave reaches the viscosity flow temperature of the film, the heating is stopped and the second vacuum pump is turned off to restore the sealing device to normal pressure. At this time, the film is in a free state, and the lateral flow of the film is accelerated. After the film flows, the valve on the sealing device is opened. When the pressure in the sealing device is consistent with that in the autoclave, the autoclave begins to be pressurized.

[0027] The first preset value is 0.3-0.7 bar.

[0028] The temperature of the autoclave is 80° C. to 130° C., the pressure of the autoclave is 0.8 MPa to 1.6 MPa, and the time of heat preservation and pressure preservation is 2 h to 8 h.

[0029] The cooling speed is 3-5 hours to cool to 50°C.

[0030] The film is a polyurethane film, and the thickness of the film is 0.1-10 mm.

[0031] By means of the above technical solution, the present invention has at least the following advantages:

[0032] The present invention provides a sealing device on the outer layer of the vacuum bag and simultaneously draws vacuum on the inner and outer surfaces of the vacuum bag, so that the film is not subjected to stress during the vacuum drawing process and the air guide patterns of the film are smoothly exhausted, so as to achieve the purpose of quickly and smoothly drawing out the air in the bonding layer without any residual gas retention, thereby preventing the residual gas from causing debonding and bubbles in the laminated glass.

[0033] The present invention also adjusts the autoclave process. When the film is at the viscous flow temperature, the second vacuum pump is turned off to restore the normal pressure in the sealing device. At this time, the film is in a free state, which accelerates the lateral flow of the film. After the flow, the valve of the sealing device is opened to apply pressure to the autoclave, thereby ensuring that there is no stress between the layers of glass, the film is in a free state, and the rapid change of the refractive index of the film is avoided, thereby improving the optical performance of the laminated glass and extending the service life.

[0034] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention and implement it according to the contents of the specification, the following is a detailed description of the preferred embodiments of the present invention in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 It is a schematic structural diagram of a steam-pressed laminating device for laminated glass provided in an embodiment of the present invention;

[0036] Figure 2 It is a schematic structural diagram of a laminated glass autoclave provided by an embodiment of the present invention;

[0037] Figure 3 It is a process flow chart of preparing laminated glass provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0038] In order to further explain the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the specific implementation methods, structures, features and effects of the present invention are described in detail below in conjunction with the accompanying drawings and preferred embodiments. In the following description, different "one embodiment" or "embodiment" does not necessarily refer to the same embodiment. In addition, specific features, structures, or characteristics in one or more embodiments may be combined in any suitable form.

[0039] like Figure 1 and Figure 2 As shown, a laminated glass autoclave laminating device comprises a vacuum bag 1, wherein the laminated glass 2 is placed in the vacuum bag 1, the vacuum bag 1 is connected to a first vacuum pump 4 via a first exhaust pipe 3, the vacuum bag 1 is arranged in a sealing device 5, the first exhaust pipe 3 passes through the sealing device 5 and is connected to the vacuum bag 1, a valve 6 is arranged on the sealing device 5, the sealing device 5 is connected to a second vacuum pump 8 via a second exhaust pipe 7, when in use, the sealing device 5 is loaded with the laminated glass 2 and placed in an autoclave 9, the laminated glass 2 comprises a first layer of glass 21 and a second layer of glass 22, a film 20 is arranged between the first layer of glass 21 and the second layer of glass 22.

[0040] Preferably, the valve 6 is an automatic control valve, which may be an electric control valve or a pneumatic control valve.

[0041] See also Figure 3 , a method for preparing laminated glass, comprising the following steps:

[0042] (1) Glass matching:

[0043] Select at least two pieces of glass;

[0044] (2) Lamination:

[0045] Place film between two sheets of glass;

[0046] (3) Place in vacuum bag:

[0047] The laminated glass is placed in a vacuum bag, and the vacuum bag is placed in a sealing device;

[0048] (4) Place in autoclave:

[0049] Put the sealing device containing the glass into the autoclave, lead the first exhaust pipe out of the autoclave and connect it to the first vacuum pump, and lead the second exhaust pipe out of the autoclave and connect it to the second vacuum pump;

[0050] (5) Air extraction:

[0051] Simultaneously start the first vacuum pump and the second vacuum pump to synchronously evacuate the inner and outer surfaces of the vacuum bag, keep the pressure inside and outside the vacuum bag consistent, and increase the temperature and pressure of the autoclave;

[0052] (6) Heat preservation and pressure maintenance:

[0053] Maintaining the temperature and pressure in the autoclave;

[0054] (7) Cooling and pressure relief:

[0055] Cool down and release the pressure of the autoclave;

[0056] (8) Remove the laminated glass:

[0057] The sealed device is taken out from the autoclave, and the laminated glass in the vacuum bag is taken out.

[0058] Furthermore, when the pressure in the vacuum bag and the sealing device reaches a first preset value, the temperature of the autoclave is increased. When the temperature of the autoclave reaches the viscosity flow temperature of the film, the heating is stopped and the second vacuum pump is turned off to restore the sealing device to normal pressure. At this time, the film is in a free state and the flow of the film is accelerated. After the film flows, the valve on the sealing device is opened. When the pressure in the sealing device is consistent with that in the autoclave, the autoclave begins to be pressurized.

[0059] The first preset value is 0.3-0.7 bar.

[0060] The temperature of the autoclave is 80° C. to 130° C., the pressure of the autoclave is 0.8 MPa to 1.6 MPa, and the time of heat preservation and pressure preservation is 2 h to 8 h.

[0061] The cooling speed is 3-5 hours to cool to 50°C.

[0062] The film is a polyurethane film, and the thickness of the film is 0.1-10 mm.

[0063] The present invention will be further described below by means of specific embodiments:

[0064] Example 1

[0065] A method for preparing laminated glass using a laminated glass steam pressing lamination device comprises the following steps:

[0066] (1) Glass matching:

[0067] Select at least two pieces of glass;

[0068] (2) Lamination:

[0069] Place film between two sheets of glass;

[0070] (3) Place in vacuum bag:

[0071] The laminated glass is placed in a vacuum bag, and the vacuum bag is placed in a sealing device;

[0072] (4) Place in autoclave:

[0073] Put the sealing device containing the glass into the autoclave, lead the first exhaust pipe out of the autoclave and connect it to the first vacuum pump, and lead the second exhaust pipe out of the autoclave and connect it to the second vacuum pump;

[0074] (5) Air extraction:

[0075] Simultaneously start the first vacuum pump and the second vacuum pump to synchronously evacuate the inner and outer surfaces of the vacuum bag to keep the pressure inside and outside the vacuum bag consistent. When the pressure inside the vacuum bag and the sealing device reaches 0.5 bar, heat the autoclave to 90°C to reach the viscosity flow temperature of the 0.63mm thick polyurethane film. Stop heating and turn off the second vacuum pump to restore the sealing device to normal pressure. At this time, the polyurethane film is in a free state, and the flow of the lateral polyurethane film is accelerated. After the polyurethane film flows, open the valve on the sealing device. When the pressure inside the sealing device is consistent with that of the autoclave, start pressurizing the autoclave to 1.3MPa. During the above process, the vacuum bag is always in a vacuum state.

[0076] (6) Heat preservation and pressure maintenance:

[0077] Maintain the temperature and pressure in the autoclave for 6 hours;

[0078] (7) Cooling and pressure relief:

[0079] The autoclave was cooled to 50°C after 4 hours, the pressure in the autoclave was reduced to normal pressure, and the first vacuum pump was turned off;

[0080] (8) Remove the laminated glass:

[0081] The sealed device is taken out from the autoclave, and the laminated glass in the vacuum bag is taken out.

[0082] Example 2

[0083] The method for preparing laminated glass in this embodiment is basically the same as that in embodiment 1, except that:

[0084] In step (5), when the pressure in the vacuum bag and the sealing device reaches 0.3 bar, the temperature of the autoclave is raised to 80° C. to reach the viscosity flow temperature of the polyurethane film with a thickness of 0.38 mm, and the autoclave is pressurized to 0.8 MPa;

[0085] In step (6), the heat preservation and pressure holding time is 2 hours;

[0086] In step (7), the temperature of the autoclave is lowered to 50° C. over 3 hours.

[0087] Example 3

[0088] The method for preparing laminated glass in this embodiment is basically the same as that in embodiment 1, except that:

[0089] In step (5), when the pressure in the vacuum bag and the sealing device reaches 0.7 bar, the temperature of the autoclave is raised to 130° C. to reach the viscosity flow temperature of a polyurethane film with a thickness of 10 mm, and the autoclave is pressurized to 1.6 MPa;

[0090] In step (6), the heat preservation and pressure holding time is 8 hours;

[0091] In step (7), the temperature of the autoclave is lowered to 50° C. over 5 hours.

[0092] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technician familiar with this profession can make some changes or modifications to equivalent embodiments of equivalent changes using the technical contents disclosed above without departing from the scope of the technical solution of the present invention. However, any simple modification, equivalent change and modification made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention still falls within the scope of the technical solution of the present invention.

Claims

1. A laminated glass autoclave laminating device, comprising a vacuum bag, wherein the laminated glass is placed in the vacuum bag, and the vacuum bag is connected to a first vacuum pump via a first exhaust pipe, wherein: The vacuum bag is arranged in the sealing device, the first exhaust pipe passes through the sealing device and is connected to the vacuum bag, a valve is arranged on the sealing device, and the sealing device is connected to the second vacuum pump through the second exhaust pipe.

2. The method according to claim 1, characterized in that The valve is an automatic control valve.

3. A method for preparing laminated glass using the steam pressing laminating device for laminated glass according to claim 1 or 2, characterized in that: The following steps are involved: (1) Glass matching: Select at least two pieces of glass; (2) Lamination: Place film between two sheets of glass; (3) Place in vacuum bag: The laminated glass is placed in a vacuum bag, and the vacuum bag is placed in a sealing device; (4) Place in autoclave: Put the sealing device containing the glass into the autoclave, lead the first exhaust pipe out of the autoclave and connect it to the first vacuum pump, and lead the second exhaust pipe out of the autoclave and connect it to the second vacuum pump; (5) Air extraction: Simultaneously start the first vacuum pump and the second vacuum pump to synchronously evacuate the inner and outer surfaces of the vacuum bag, keep the pressure inside and outside the vacuum bag consistent, and increase the temperature and pressure of the autoclave; (6) Heat preservation and pressure maintenance: Maintaining the temperature and pressure in the autoclave; (7) Cooling and pressure relief: Cool down and depressurize the autoclave, and then turn off the first vacuum pump; (8) Remove the laminated glass The sealed device is taken out from the autoclave, and the laminated glass in the vacuum bag is taken out.

4. The method according to claim 3, characterized in that When the pressure in the vacuum bag and the sealing device reaches the first preset value, the temperature of the autoclave is increased. When the temperature of the autoclave reaches the viscosity flow temperature of the film, the heating is stopped and the second vacuum pump is turned off to restore the sealing device to normal pressure. At this time, the film is in a free state, and the lateral flow of the film is accelerated. After the film flows, the valve on the sealing device is opened. When the pressure in the sealing device is consistent with that in the autoclave, the autoclave begins to be pressurized.

5. The method according to claim 4, characterized in that The first preset value is 0.3-0.7 bar.

6. The method according to claim 4 or 5, characterized in that: The temperature of the autoclave is 80° C. to 130° C., the pressure of the autoclave is 0.8 MPa to 1.6 MPa, and the time of heat preservation and pressure preservation is 2 h to 8 h.

7. The method according to claim 6, characterized in that The cooling speed is 3-5 hours to cool to 50°C.

8. The method according to claim 7, characterized in that The film is a polyurethane film, and the thickness of the film is 0.1-10 mm.

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