JP2016088813A - Method for producing laminated glass - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for producing laminated glass which easily suppresses thickness deviation.SOLUTION: A method for producing laminated glass includes a heating step HP of heating a laminate including a first plate glass, a second glass and a resin film arranged between the first plate glass and the second plate glass at a higher pressure (for instance, pressure PH) than an atmospheric pressure. The heating step HP is a step of bonding the first plate glass and the second plate glass, and a resin layer formed from the film. The film constituting the laminate is a film which has been subjected to an embossing work. The method for producing the laminated glass has a preheating step PHP as a preceding step of the heating step HP. The preheating step PHP is a step of heating the laminate until the emboss pattern of the film disappears under a lower pressure (for instance, pressure PL) atmosphere than the atmospheric pressure and at a lower heating temperature (for instance, temperature TL) than the heating temperature (for instance, temperature TH) of the heating step HP.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a method for producing laminated glass.

  As disclosed in Patent Document 1, laminated glass is used as fire safety glass, for example. The laminated glass of patent document 1 is obtained by thermocompression-bonding the laminated body which has arrange | positioned resin film between a pair of glass.

JP 2010-013338 A

  As disclosed in Patent Document 1, when a laminated glass is manufactured by thermocompression bonding a laminate in which a resin film is disposed between a pair of glasses, the resin constituting the film flows, and the pair of glasses Resin tends to bulge out between the plates. As a result, there is a problem that uneven thickness is easily generated such that the thickness of the peripheral portion of the obtained laminated glass becomes thin.

  This invention is made | formed in view of such a situation, The objective is to provide the manufacturing method of the laminated glass which can suppress uneven thickness easily.

  The manufacturing method of the laminated glass which solves the said subject is a laminated body provided with the 1st plate glass, the 2nd plate glass, and the resin-made film arrange | positioned between the said 1st plate glass and the said 2nd plate glass, A method for producing a laminated glass comprising a heating step of bonding the first plate glass and the second plate glass and a resin layer formed from the film by heating in an atmosphere at a pressure higher than atmospheric pressure. The film is an embossed film, and as a pre-process of the heating process, the laminate is heated in an atmosphere at a pressure lower than atmospheric pressure and at a heating temperature lower than the heating temperature of the heating process. A preheating step of heating until the embossed pattern of the film disappears is provided.

  In this method, the preheating step for heating the laminate is performed in an atmosphere at a pressure lower than atmospheric pressure. Thereby, since the gas between the film which comprises a laminated body, and 1st plate glass and between a film and 2nd plate glass is discharged | emitted, the adhesiveness of a film, 1st plate glass, and 2nd plate glass increases. . In addition, since the film which comprises a laminated body is embossed, it accelerates | stimulates the discharge | emission of the gas between a 1st glass plate and 2nd glass plate, and a film compared with the film which is not embossed. can do. Moreover, in a preheating process, since it heats until the embossing pattern of the film which comprises a laminated body lose | disappears, the adhesiveness of a film, 1st plate glass, and 2nd plate glass further increases. Moreover, since a preheating process is performed at the heating temperature lower than the heating temperature of a heating process, the shape of the film which comprises a laminated body is easy to be maintained. By such a preheating step, the shape of the film is maintained, and the adhesion between the film and the first plate glass and the second plate glass is increased. For this reason, even if the fluidity of the resin constituting the film is increased in the heating step, it is easily held between the first plate glass and the second plate glass. Thus, when the manufacturing method of a laminated glass is provided with a preheating process and a heating process, it becomes difficult for resin which comprises a film to swell from between 1st sheet glass and 2nd sheet glass.

  In the method for producing a laminated glass, the laminate in the preliminary heating step is heated to a range of 50 ° C. or more and less than 90 ° C., and the laminate in the heating step is 90 ° C. or more and 160 ° C. Heating is preferably performed until the following range is reached.

Thus, by setting the heating temperature in the preliminary heating step and the heating step, the resin constituting the film becomes more difficult to bulge from between the first plate glass and the second plate glass.
In the method for producing laminated glass, it is preferable that the minimum value of pressure in the preliminary heating step is 0.5 atm or less, and the maximum value of pressure in the heating step is 5 atm or more.

Thus, by setting the pressure in the preliminary heating step and the heating step, the resin constituting the film is more difficult to swell from between the first plate glass and the second plate glass.
In the method for producing laminated glass, it is preferable that the laminate in the preliminary heating step is disposed inside a resin bag.

  According to this method, the preheating process under a low-pressure atmosphere can be performed by reducing the pressure inside the resin bag. Further, by reducing the pressure inside the resin bag, the resin bag can be brought into close contact with the first glass plate and the second glass plate. In this way, by bringing the resin bag into close contact with the first glass plate and the second glass plate, heat outside the resin bag is easily transmitted to the first plate glass and the second plate glass. Therefore, it is possible to easily set the temperature of the laminate in the preheating step.

  In the method for producing laminated glass, in the preliminary heating step and the heating step, a pressure device capable of heating the inside is used, and the resin bag is preferably disposed in the pressure device. .

  According to this method, the pressure of the heating step can be set by pressurizing the inside of the resin bag with the pressurizing device after the preheating step of reducing the pressure inside the resin bag. Thus, both the preheating step and the heating step can be performed inside the pressurizing apparatus.

  According to the present invention, it is easy to suppress uneven thickness of laminated glass.

(A) is a fragmentary sectional view which shows the laminated glass of this embodiment, (b) is a fragmentary sectional view explaining a laminated body. It is a graph explaining the conditions of temperature and pressure in the manufacturing method of a laminated glass. It is the schematic which shows the manufacturing apparatus of a laminated glass.

  Hereinafter, an embodiment of a method for producing a laminated glass will be described with reference to the drawings. Note that in the drawings, some of the components may be exaggerated for convenience of explanation. Further, the dimensional ratio of each part may be different from the actual one.

  As shown in FIGS. 1A and 1B, the laminated glass 11 is manufactured using a laminated body 12. The laminate 12 includes a first plate glass G1, a second plate glass G2, and a resin film R1 disposed between the first plate glass G1 and the second plate glass G2.

  Examples of the first plate glass G1 and the second plate glass G2 include alkali-free glass, chemically tempered glass, and crystalline glass. The thickness of each plate glass of the 1st plate glass G1 and the 2nd plate glass G2 is the range of 0.1 mm or more and 12 mm or less, for example.

  The film R1 constituting the laminate 12 is a film R1 that has been embossed. By using the embossed film R1, the discharge of gas between the first glass sheet G1 and the second glass sheet G2 and the film R1 can be promoted. The film R1 is preferably embossed on both sides. As the film R <b> 1, a commercially available film for the interlayer film of the laminated glass 11 can be used. Examples of the resin constituting the film R1 include thermoplastics such as polyvinyl butyral, polyvinyl acetate, polyvinyl alcohol, ethylene-vinyl acetate copolymer, polyethylene terephthalate, polycarbonate, polyvinyl chloride, acrylic resin, and fluorine resin. Resin. The thickness of the film R1 is preferably in the range of 0.2 mm or more and 2 mm or less, for example.

  As shown in FIG. 2, the manufacturing method of the laminated glass 11 is equipped with the heating process HP which heats the laminated body 12 mentioned above in the atmosphere (for example, pressure PH) higher than atmospheric pressure (pressure P1). . This heating process HP is a process for bonding the first glass sheet G1 and the second glass sheet G2 to the resin layer R2 formed from the film R1. The manufacturing method of the laminated glass 11 is equipped with the preheating process PHP as a pre-process of the heating process HP. In the preheating step PHP, the laminate 12 is heated in an atmosphere at a pressure lower than atmospheric pressure (pressure P1) (eg, pressure PL) and lower than a heating temperature (eg, temperature TH) in the heating step HP (eg, temperature TH). , Temperature TL) is a step of heating the laminate 12. In this preheating step PHP, the laminate 12 is heated until the embossed pattern of the film R1 disappears.

First, the preheating process PHP will be described in detail.
The pressure PL in FIG. 2 represents the minimum value of the pressure in the preheating process PHP. The pressure PL is preferably 0.5 atm (atm) or less. By setting the pressure PL in the preheating step PHP to be lower, the adhesion between the first glass sheet G1 and the film R1 is enhanced, and the adhesion between the second glass sheet G2 and the film R1 is likely to be enhanced.

  The temperature TL in FIG. 2 represents the maximum value of the heating temperature of the stacked body 12 in the preheating step PHP. This temperature TL is preferably 50 ° C. or higher, more preferably 60 ° C. or higher. By setting the temperature TL in the preheating process PHP higher, the time of the preheating process PHP can be shortened.

  The temperature TL in the preheating step PHP is preferably less than 90 ° C, more preferably 85 ° C or less, and further preferably 80 ° C or less. By setting the temperature TL in the preheating step PHP to be lower, the shape of the film R1 constituting the laminated body 12 is easily maintained.

From the above, it is more preferable that the laminate 12 in the preheating step PHP is heated to a range of 50 ° C. or higher and lower than 90 ° C.
The time TP in the preliminary heating step PHP can be set based on, for example, a preliminary test using the laminated body 12 for obtaining the laminated glass 11. In the preliminary test, a sample of the laminate 12 is prepared, and the sample is heated at a predetermined temperature and visually observed. Here, the non-heated sample is opaque or translucent because the film R1 has an embossed pattern. When this sample is heated, the embossed pattern disappears with the softening of the main surface (both surfaces) of the film R1. At this time, the sample changes from an opaque or translucent state to a transparent state. In such a preliminary test, the time for the preliminary heating step PHP can be set based on the time during which the sample is in a transparent state. The time TP in the preheating step PHP is, for example, in the range of 30 minutes to 240 minutes.

Next, the heating process HP will be described in detail.
The pressure PH in FIG. 2 represents the maximum pressure value in the heating process HP. This pressure PH is preferably 5 atm or more, more preferably 10 atm or more. By setting the pressure PH in the heating process HP to be higher, bubbles between the first glass sheet G1 and the second glass sheet G2 of the laminated glass 11 obtained are less likely to remain. The pressure PH in the heating process HP is set to 15 atm or less, for example.

  The temperature TH in FIG. 2 represents the maximum value of the heating temperature of the laminated body 12 in the heating process HP. This temperature TH is set to a temperature at which the resin layer R2 formed by softening (melting) the film R1 constituting the laminated body 12 can be bonded to the first glass sheet G1 and the second glass sheet G2. This temperature TH is preferably 90 ° C. or higher, more preferably 100 ° C. or higher, and further preferably 110 ° C. or higher. By setting the temperature TH in the heating process HP higher, the time of the heating process HP can be shortened.

  The temperature TH in the heating step HP is preferably 160 ° C. or lower, more preferably 150 ° C. or lower. By setting the temperature TH in the heating process HP to be lower, the flow of the resin layer R2 is further easily suppressed. In addition, the time T in the heating process HP is, for example, in the range of 30 minutes or more and 240 minutes or less.

Next, an example of the manufacturing apparatus of the laminated glass 11 is demonstrated.
As shown in FIG. 3, the laminated glass 11 manufacturing apparatus 13 of the present embodiment includes a pressure device 14 that can heat the inside, and a resin that is disposed inside the pressure device 14 and that houses the laminate 12. A bag 15 made of plastic and a pump 16 for decompression are provided. The pressurizing device 14 further includes a heater and a pressure gas supply unit (not shown). A known autoclave device can be used as the pressurizing device 14. As the pressure gas, air or an inert gas such as nitrogen may be used. The resin bag 15 is formed of a heat-resistant sheet having heat resistance that can withstand the heating in the heating step HP. As the heat-resistant sheet, for example, a polyamide sheet is preferably used. The laminated body 12 is disposed inside the bag 15.

  The inside of the bag 15 in the manufacturing apparatus 13 for the laminated glass 11 and the pump 16 arranged outside the pressurizing apparatus 14 are connected by a discharge pipe 17, and the inside of the resin bag 15 is decompressed through the discharge pipe 17. It is comprised so that. An adjustment pipe 18 is further connected to the discharge pipe 17, and the adjustment pipe 18 is connected to the inside of the pressurizing device 14 and to the outside of the bag 15.

  The discharge pipe 17 is provided with a first on-off valve 19. The first on-off valve 19 is disposed between the pump 16 and the connecting portion 17 a of the adjustment pipe 18. The adjustment pipe 18 is provided with a second opening / closing valve 20. The pump 16 may be changed to another decompression device such as an aspirator, for example.

Next, operation | movement of the manufacturing apparatus 13 of the laminated glass 11 is demonstrated.
The preheating step PHP in the method for manufacturing the laminated glass 11 is performed in a state where the first on-off valve 19 of the manufacturing apparatus 13 for the laminated glass 11 is opened and the second on-off valve 20 is closed. In the preheating process PHP, the inside of the bag 15 is depressurized through the discharge pipe 17 and the periphery of the bag 15 is heated by a heater provided in the pressurizing device 14. At this time, the bag 15 is deformed so as to be in close contact with the first glass sheet G1 and the second glass sheet G2 constituting the laminate 12. Thus, the laminated body 12 is heated through the bag 15 closely adhered to the first glass sheet G1 and the second glass sheet G2.

  When shifting from the preheating step PHP to the heating step HP, the first on-off valve 19 of the manufacturing apparatus 13 for the laminated glass 11 is closed and the second on-off valve 20 is opened. At this time, the inside of the bag 15 is communicated with the outside of the bag 15 inside the pressurizing device 14 through the adjustment pipe 18 and the discharge pipe 17. Thereby, as schematically shown by a two-dot chain line in FIG. 3, the pressure inside the bag 15 and the pressure outside the bag 15 inside the pressurizing device 14 become equal.

  Moreover, when making it transfer to the heating process HP from the preheating process PHP, while raising the pressure inside the pressurization apparatus 14 of the manufacturing apparatus 13 of the laminated glass 11, the temperature inside the pressurization apparatus 14 is raised. Thereby, the laminated body 12 of the heating process HP is pressurized and heated at a temperature higher than that of the preheating process PHP.

Next, the main effect | action of the manufacturing method of the laminated glass 11 is demonstrated.
The preheating step PHP for heating the laminated body 12 is performed in an atmosphere at a pressure lower than the atmospheric pressure. Thereby, the gas between the film R1 and the 1st sheet glass G1 which comprise the laminated body 12, and between the film R1 and the 2nd sheet glass G2 is discharged | emitted. This gas discharge is promoted by embossing applied to both surfaces of the film R1. And the adhesiveness of film R1, 1st plate glass G1, and 2nd plate glass G2 increases. Moreover, in the preheating process PHP, since it heats until the embossing pattern of the film R1 which comprises the laminated body 12 lose | disappears, the adhesiveness of film R1, 1st glass plate G1, and 2nd glass plate G2 further increases. Moreover, since the preheating process PHP is performed at a heating temperature lower than the heating temperature of the heating process HP, the shape of the film R1 constituting the laminate 12 is easily maintained. By such a preheating step PHP, the shape of the film R1 is maintained, and the adhesion between the film R1 and the first plate glass G1 and the second plate glass G2 is increased. For this reason, even if the fluidity of the resin constituting the film R1 is increased in the heating step HP, it is easily held between the first plate glass G1 and the second plate glass G2. Thus, when the manufacturing method of the laminated glass 11 is provided with the preheating process PHP and the heating process HP, it becomes difficult for the resin which comprises the film R1 to swell from between the 1st sheet glass G1 and the 2nd sheet glass G2.

According to the embodiment described in detail above, the following operational effects are exhibited.
(1) The manufacturing method of the laminated glass 11 is a laminated body including a first plate glass G1, a second plate glass G2, and a resin film R1 disposed between the first plate glass G1 and the second plate glass G2. The heating process HP which heats 12 in the atmosphere of a pressure higher than atmospheric pressure is provided. This heating process HP is a process for bonding the first glass sheet G1 and the second glass sheet G2 to the resin layer R2 formed from the film R1. The film R1 constituting the laminate 12 is a film R1 that has been embossed. The manufacturing method of the laminated glass 11 is provided with the preheating process PHP as a pre-process of the heating process HP. The preheating step PHP is a step of heating the laminated body 12 in an atmosphere lower than atmospheric pressure and at a heating temperature lower than the heating temperature of the heating step HP until the embossed pattern of the film R1 disappears.

  According to this method, as described above, it is difficult for the resin constituting the film R1 to bulge from between the first glass sheet G1 and the second glass sheet G2. Therefore, it becomes easy to suppress the uneven thickness of the laminated glass 11.

  (2) In the manufacturing method of the laminated glass 11, the laminated body 12 in the preheating step PHP is heated to a range of 50 ° C. or higher and lower than 90 ° C., and the heating temperature of the heating step HP is 90 ° C. or higher. It is preferable that it is 160 degrees C or less. Thus, by setting the heating temperature in the preheating process PHP and the heating process HP, the resin constituting the film R1 is more difficult to bulge from between the first glass sheet G1 and the second glass sheet G2. Therefore, uneven thickness of the laminated glass 11 is further easily suppressed.

  (3) In the manufacturing method of the laminated glass 11, it is preferable that the minimum value of the pressure in the preheating process PHP is 0.5 atm or less, and the maximum value of the pressure in the heating process HP is 5 atm or more. Thus, by setting the pressure in the preheating process PHP and the heating process HP, the resin constituting the film R1 is more difficult to swell from between the first glass sheet G1 and the second glass sheet G2. Therefore, uneven thickness of the laminated glass 11 is further easily suppressed.

  (4) In the manufacturing method of the laminated glass 11, it is preferable that the laminated body 12 in the preheating process PHP is arrange | positioned inside the resin-made bags 15. FIG. In this case, it is possible to perform the preheating step PHP under a low-pressure atmosphere by reducing the pressure inside the resin bag 15. Further, by reducing the pressure inside the resin bag 15, the resin bag 15 can be brought into close contact with the first glass plate and the second glass plate. As described above, by bringing the resin bag 15 into close contact with the first glass plate and the second glass plate, heat outside the resin bag 15 is easily transferred to the first plate glass G1 and the second plate glass G2. Therefore, the temperature setting of the laminated body 12 in the preheating step PHP can be easily performed.

  (5) In the manufacturing method of the laminated glass 11, the pressurization apparatus 14 which can heat an inside is used in the preheating process PHP and the heating process HP. In the preheating step PHP and the heating step HP, it is preferable that a resin bag 15 is disposed inside the pressurizing device 14.

  In this case, the pressure of the heating step HP can be set by pressurizing the inside of the resin bag 15 with the pressurizing device 14 after the preheating step PHP in which the inside of the resin bag 15 is depressurized. Thus, both the preheating process PHP and the heating process HP can be performed inside the pressurizing apparatus 14. Thereby, for example, it is possible to save the trouble of moving the laminate 12 between the preliminary heating process PHP and the heating process HP. Therefore, the productivity of the laminated glass 11 can be increased.

(Example of change)
The above embodiment may be modified as follows.
The preheating step PHP of the method for manufacturing the laminated glass 11 is performed by placing the resin bag 15 inside the pressurizing device 14, but the resin bag 15 can be heated other than the pressurizing device 14. It can also be arranged inside the container.

-The preheating process PHP in the manufacturing method of the said laminated glass 11 can also be performed using the container which can be pressure-reduced and heated, without using the resin-made bag 15, for example.
The heating step HP in the method for manufacturing the laminated glass 11 can be performed without using the resin bag 15.

  The adjustment pipe 18 of the laminated glass 11 manufacturing apparatus is connected to the discharge pipe 17, but the adjustment pipe 18 may be connected to the bag 15 through a different path from the discharge pipe 17. However, it is preferable that the adjustment pipe 18 is connected to the discharge pipe 17 as in the above-described embodiment from the viewpoint that the bag 15 can be easily replaced by simplifying the configuration of the bag 15.

  -The laminated structure of the laminated body 12 used for the manufacturing method of the said laminated glass 11 can also be changed into the laminated structure further provided with resin-made films and plate glass. That is, the laminated glass 11 can be changed to a configuration having three or more plate glasses and two or more resin layers.

  -The use of the laminated glass 11 obtained by the manufacturing method of the said laminated glass 11 is not specifically limited. Applications of the laminated glass 11 include, for example, window glass applications, building material applications, and vehicle applications.

The technical idea that can be grasped from the embodiment and the modified examples will be described below.
(A) A laminated glass manufacturing apparatus that manufactures laminated glass from a laminate including a first plate glass, a second plate glass, and a resin film disposed between the first plate glass and the second plate glass. A pressure device capable of heating the inside, a resin bag disposed inside the pressure device and containing the laminate, a decompression device for decompressing the interior of the bag, and the bag An apparatus for producing laminated glass, comprising: a pipe for equalizing the pressure inside the bag and the pressure outside the bag and inside the pressure device.

  (B) In the method for producing laminated glass, a discharge pipe that connects the decompression device and the inside of the bag, an adjustment pipe that connects the discharge pipe and the outside of the bag and the inside of the pressurizing device, An apparatus for producing laminated glass, comprising: a first on-off valve provided between a connection portion of the discharge pipe with the adjustment pipe and the decompression device; and a second on-off valve provided on the adjustment pipe.

  DESCRIPTION OF SYMBOLS 11 ... Laminated glass, 12 ... Laminate body, 14 ... Pressure apparatus, 15 ... Bag, G1 ... 1st plate glass, G2 ... 2nd plate glass, R1 ... Film, R2 ... Resin layer, PHP ... Preheating process, HP ... Heating Process.

Claims (5)

A laminate including a first plate glass, a second plate glass, and a resin film disposed between the first plate glass and the second plate glass is heated in an atmosphere at a pressure higher than atmospheric pressure. By this, it is a manufacturing method of a laminated glass provided with the heating process which adheres the 1st plate glass and the 2nd plate glass, and the resin layer formed from the film,
The film is an embossed film,
As a pre-process of the heating step, a preheating step of heating the laminated body in an atmosphere at a pressure lower than atmospheric pressure and at a heating temperature lower than the heating temperature of the heating step until the embossed pattern of the film disappears. A method for producing a laminated glass, comprising:   The laminate in the preheating step is heated until it is in a range of 50 ° C. or higher and less than 90 ° C., and the laminate in the heating step is heated until it is in a range of 90 ° C. or higher and 160 ° C. or lower. The manufacturing method of the laminated glass of Claim 1 characterized by the above-mentioned. The minimum value of the pressure in the preheating step is 0.5 atm or less,
The maximum value of the pressure of the said heating process is 5 atmospheres or more, The manufacturing method of the laminated glass of Claim 1 or Claim 2 characterized by the above-mentioned.   The said laminated body in the said preheating process is arrange | positioned inside the resin-made bags, The manufacturing method of the laminated glass as described in any one of Claims 1-3 characterized by the above-mentioned.   The said preheating process and the said heating process WHEREIN: While using the pressurization apparatus which can heat an inside, the said resin-made bags are arrange | positioned inside the said pressurization apparatus. A method for producing laminated glass.