JP2019026516A - Method for manufacturing laminated glass - Google Patents

Abstract

To provide a method for manufacturing a laminated glass by which generation of a liquid crystal pool or a void can be reduced.SOLUTION: A method for manufacturing a laminated glass using a laminate 30 that includes a dimming film 10 interposed between a first glass plate 33A and a second glass plate 33B is provided, which includes: a support body disposing step of disposing a support body 43 along an outer periphery of the laminate 30; and a pressurizing step of pressurizing at least one plate surface of the first glass plate 33A and the second glass plate 33B while the support body 43 is disposed along the outer periphery of the laminate 30.SELECTED DRAWING: Figure 3

Description

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

Conventionally, for example, a light control film that can be used for an electronic blind or the like that is attached to a window to control the transmission of external light has been proposed (Patent Documents 1 and 2). One such light control film uses liquid crystal.
A light control film using liquid crystal is produced by sandwiching a liquid crystal material with a transparent plate material including a transparent electrode to produce a liquid crystal film including a liquid crystal cell, and sandwiching the liquid crystal film with a linear polarizing plate. This light control film changes the orientation of the liquid crystal by changing the electric field applied between the transparent electrodes, and controls the amount of transmitted extraneous light.

In addition, it has been proposed to manufacture laminated glass by further sandwiching the above-described liquid crystal film with glass (Patent Document 3).
However, conventionally, a laminated glass sandwiching a liquid crystal film has never been actually produced. Therefore, there is a case where a laminated glass sandwiching a liquid crystal film cannot be manufactured correctly by simply applying the same technique as that of a conventional laminated glass configured by sandwiching an intermediate film.
As a case where the laminated glass sandwiching the liquid crystal film cannot be manufactured correctly, there is a phenomenon that a large amount of liquid crystal is accumulated in the liquid crystal film (hereinafter referred to as “liquid crystal pool”). Moreover, a space | gap may arise in a part of laminated glass. If such a liquid crystal pool or void exists, it must be discarded as a defective product, and improvement is desired.

JP 03-47392 A Japanese Patent Laid-Open No. 08-184273 Japanese Patent Laid-Open No. 2006-164617

  The subject of this invention is providing the manufacturing method of the laminated glass which can reduce generation | occurrence | production of a liquid crystal pool and a space | gap.

  The present invention solves the above problems by the following means. In addition, in order to make an understanding easy, although the code | symbol corresponding to embodiment of this invention is attached | subjected and demonstrated, it is not limited to this.

  1st invention is a manufacturing method of the laminated glass (1) using the laminated body (30) which pinched | interposed the liquid crystal film (10) with the 1st glass plate (33A) and the 2nd glass plate (33B). And the support body arrangement | positioning process which arrange | positions a support body (43) along the outer periphery of the said laminated body (30), and the state by which the said support body (43) was arrange | positioned along the outer periphery of the said laminated body (30) And a pressurizing step of pressurizing at least one plate surface of the first glass plate (33A) and the second glass plate (33B).

  2nd invention is a manufacturing method of the laminated glass (1) as described in 1st invention, The said laminated body (30) is the 1st glass plate (33A), and 1st intermediate film formation sheet (31A). ), A liquid crystal film (10), a second intermediate film forming sheet (31B), and a second glass plate (33B) are laminated in this order, and the support (43) Laminated glass (1), characterized in that it is made of a material having higher rigidity than the first intermediate film forming sheet (31A) and the second intermediate film forming sheet (31B) in the pressing step. It is a manufacturing method.

  3rd invention is a manufacturing method of the laminated glass (1) as described in 1st invention or 2nd invention, The said pressurization process is performed by the pressure of 0.5 atmosphere or less, It is characterized by the above-mentioned. It is a manufacturing method of a laminated glass (1).

  4th invention is the manufacturing method of the laminated glass (1) in any one from 1st invention to 3rd invention, The height of the said laminated body (30) from the height of the said support body (43). The height difference minus the height is −10 mm or more and 5 mm or less. However, the height of the laminated body (30) is the contact plate (41A, 41B) when using the contact plate (41A, 41B). 41B) including the height of the laminated glass (1).

  5th invention is the manufacturing method of the laminated glass (1) in any one from 1st invention to 4th invention, The distance between the said support body (43) and the said laminated body (30). Is a manufacturing method of the laminated glass (1) characterized by being 20 mm or less.

  6th invention is a manufacturing method of the laminated glass (1) in any one from 1st invention to 5th invention, WHEREIN: The said pressurization process is performed in the state which heated the said laminated body (30). It is a manufacturing method of the laminated glass (1) characterized by this.

  7th invention is a process performed before performing the said pressurization process in the manufacturing method of the laminated glass (1) in any one from 1st invention to 6th invention, Comprising: The said laminated body (30) It further has the vacuum process which makes the inside a vacuum state, It is a manufacturing method of the laminated glass (1) characterized by the above-mentioned.

  The eighth invention is a method for producing a laminated glass (1) according to any one of the first to seventh inventions, and is higher than the pressure in the pressurizing step after the pressurizing step. A method for producing a laminated glass (1), further comprising an autoclave step of applying pressure and heating.

  According to a ninth aspect of the present invention, in the method for manufacturing a laminated glass (1) according to the eighth aspect of the present invention, the method further includes a cutting step of cutting at least a part of the outer shape of the laminated glass (1) after the autoclave step. These are the manufacturing methods of the laminated glass (1) characterized by these.

  According to a tenth aspect of the present invention, in the method for producing a laminated glass (1) according to any one of the first to ninth aspects, the first glass plate (33A) and the second glass plate (33B). ) And a spacer arrangement step of arranging a spacer (32) thicker than the liquid crystal film (10) in at least a part of the area where the liquid crystal film (10) is not arranged. Furthermore, it is a manufacturing method of the laminated glass (1) characterized by providing.

  An eleventh invention is the method for producing a laminated glass (1) according to any one of the first invention to the tenth invention, wherein at least a part of the flexible printed wiring board (18) is the first glass plate. (33A) and a flexible printed wiring board placement step to be placed between the second glass plate (33B) and the flexible printed wiring board (18) are the first glass plate (33A) and the second glass plate (33B). Inclination which arrange | positions an inclination relaxation member (34) so that it may be pinched | interposed into said 1st glass plate (33A) and said 2nd glass plate (33B) in the position different from the position pinched | interposed into the glass plate (33B) of this It is a manufacturing method of the laminated glass (1) characterized by further providing a relaxation member arrangement | positioning process.

  ADVANTAGE OF THE INVENTION According to this invention, the manufacturing method of the laminated glass which can reduce generation | occurrence | production of a liquid crystal pool and a space | gap can be provided.

It is a disassembled perspective view which shows the structure of the laminated body 30 of this embodiment. It is sectional drawing which shows the light control film 10 of embodiment. It is a flowchart explaining the manufacturing method of the laminated glass 1. FIG. It is the flowchart which showed the laminated body arrangement | positioning process in FIG. 3 in detail. It is a figure explaining the laminated body support structure 50 comprised in the manufacture process of the laminated glass 1. FIG. It is a figure explaining the outline | summary of the pre-laminating process by a vacuum laminator. It is the figure which showed typically the state of the silicon rubber sheet 64 in a pressurization process. It is the figure which put together the experimental result which investigated the influence which the change of pressurization conditions has on the pre-laminate result. It is a figure which shows the experimental result investigated about the relationship of the height of a support body and a laminated body. It is a figure which shows the experimental result which investigated the influence of the distance between a support body and a laminated body. It is a figure which shows the result of having changed the kind (thickness) of the tape and performing the pressurization process. It is a figure which shows the result of having performed the pressurization process by changing the sticking position and the number of sticking of a tape. FIG. 3 is a view showing a form in which a tape T is provided at four corners of the upper and lower surfaces of a laminated body 30. FIG. 3 is a view showing a form in which a tape T is provided at two corners of the upper and lower surfaces of a laminated body 30. FIG. 4 is a view showing a form in which a tape T is provided on four sides of the upper and lower surfaces of a laminated body 30. 3 is a view showing a form in which a tape T is provided on two sides of the upper and lower surfaces of a laminated body 30. FIG. 4 is a view showing a form in which a tape T is provided on four sides of a laminated body 30. FIG. 3 is a view showing a form in which a tape T is provided on two side surfaces of a laminated body 30. FIG.

  The best mode for carrying out the present invention will be described below with reference to the drawings.

(Embodiment)
FIG. 1 is an exploded perspective view showing the configuration of the laminate 30 of the present embodiment.
In addition, each figure shown below including FIG. 1 is the figure shown typically, and the magnitude | size and shape of each part are exaggerated suitably for easy understanding.
In the following description, specific numerical values, shapes, materials, and the like are shown and described, but these can be changed as appropriate.
In this specification, terms that specify shape and geometric conditions, for example, terms such as parallel and orthogonal, are strictly meanings, have similar optical functions, and can be regarded as parallel and orthogonal. It also includes a state having an error.
In this specification, the terms “plate”, “sheet”, “film” and the like are used, but these are generally used in the order of “thickness”, “plate”, “sheet”, “film”. It is used in the book as well. However, there is no technical meaning in such proper use, so these terms can be replaced as appropriate.
In the present specification, the sheet surface refers to a surface that is a planar direction of the sheet when viewed as the entire sheet. The same applies to the plate surface and the film surface.
In the present invention, the term “transparent” refers to a material that transmits at least light having a wavelength to be used. For example, even if it does not transmit visible light, as long as it transmits infrared light, it is handled as transparent when used for infrared applications.
It should be noted that the specific numerical values defined in the present specification and claims should be treated as including a general error range. That is, a difference of about ± 10% is substantially the same, and a value that is set in a range slightly exceeding the numerical range of the present invention is substantially the same as that of the present invention. It should be construed as within the scope.

In the description of the present embodiment, a laminate 30 in which the constituent members of the laminated glass 1 are arranged in layers is referred to as a laminate 30. Since the laminated body 30 indicates a state before each member of the laminated glass 1 is bonded, the configuration itself is the same as that of the laminated glass 1. Therefore, the exploded perspective view of FIG. 1 is also an exploded perspective view of the laminated glass 1.
The laminated body 30 of the present embodiment includes a first glass plate 33A, a first intermediate film forming sheet 31A, a light control film (liquid crystal film) 10, a second intermediate film forming sheet 31B, and a second The glass plates 33B are laminated in this order. Further, a spacer 32 and an inclination reducing member 34 are disposed at a position that is in the same plane as the light control film 10.

Drawing 2 is a sectional view showing light control film 10 of an embodiment.
The light control film (liquid crystal film) 10 is configured as a laminated glass and is used for a part that performs light control. Examples of the portion to be dimmed include a portion (rear window, side window, sunroof, etc.) on which outside light of the vehicle enters, a window glass of a building, a showcase, an indoor transparent partition, and the like.

The light control film 10 is a light control film that controls transmitted light using liquid crystal, and a liquid crystal cell having a liquid crystal layer 14 sandwiched between the film-like second laminated body 13 for liquid crystal and the first laminated body 12 for liquid crystal. 15 is manufactured, and the liquid crystal cell 15 is formed by being sandwiched between linearly polarizing plates 16 and 17.
In the present embodiment, the liquid crystal layer 14 is driven by a VA (Vertical Alignment) method, but is not limited to this, and there are various methods such as a TN (Twisted Nematic) method and an IPS (In-Plane-Switching) method. The driving method can be applied.
The VA method is a method in which the alignment of liquid crystal is changed between vertical alignment and horizontal alignment to control transmitted light. When no electric field is applied, the liquid crystal layer 14 is sandwiched between the vertical alignment layers by vertically aligning the liquid crystal. Thus, the liquid crystal cell 15 is configured, and the liquid crystal material is horizontally aligned by applying an electric field.

In the light control film 10, a liquid crystal spacer 24 for keeping the thickness of the liquid crystal layer 14 constant is provided in the liquid crystal first laminate 12 and / or the liquid crystal second laminate 13.
The liquid crystal first laminate 12 and the liquid crystal second laminate 13 are formed by sequentially forming the first electrode 22A, the second electrode 22B, and the alignment layers 23A, 23B on the base materials 21A, 21B, respectively. Moreover, the light control film 10 is good also as a structure provided with the liquid crystal cell of a guest host system, and a linearly-polarizing plate can be abbreviate | omitted in this case. In the case of the guest-host method, the linear polarizing plate may be disposed in one or both of the liquid crystal cells as necessary.

The light control film 10 is configured to control the transmission of extraneous light by changing the potential difference between the first electrode 22A and the second electrode 22B, and to switch the state between a transparent state and a non-transparent state. In the present embodiment, an example in which the liquid crystal layer 14 is driven using a so-called normally black configuration is described. However, the present invention is not limited to this, and the liquid crystal layer 14 may be driven with a normally white configuration. In addition, when the IPS method is adopted, the first electrode 22A and the second electrode 22B are collectively configured on either the alignment layer 23A side or the alignment layer 23B side, and the first laminated body for liquid crystal corresponding to this 12 and the 2nd laminated body 13 for liquid crystals will be comprised.
Note that normally black is a structure in which the transmittance is minimized when a voltage is not applied to the liquid crystal, resulting in a black screen. Normally white is a structure in which the transmittance is maximized and transparent when no voltage is applied to the liquid crystal.

[Base material]
As the base materials 21A and 21B, various transparent film materials such as flexible TAC, polycarbonate, COP, acrylic, and PET that can be applied to the liquid crystal cell 15 can be applied. A polycarbonate film material on which a coating layer is formed is applied.

[electrode]
The first electrode 22A and the second electrode 22B can apply various electric fields to the liquid crystal layer 14 and can be perceived as transparent. In the present embodiment, the first electrode 22A and the second electrode 22B are formed by manufacturing a transparent conductive film made of ITO (Indium Tin Oxide), which is a transparent electrode material, on the entire surfaces of the base materials 21A and 21B. As described above, in the IPS method or the like, the electrode is patterned into a desired shape.

[Alignment layer]
The alignment layer 23A and the alignment layer 23B are formed of a photo-alignment layer. As the photo-alignment material applicable to the photo-alignment layer, various materials to which the photo-alignment technique can be applied can be widely applied. In this embodiment, for example, a photodimerization type material is used. The photodimerization type material is described in “M. Schadt, K. Schmitt, V. Kozinkov and V. Chigrinov: Jpn. J. Appl. Phys., 31, 2155 (1992)”, “M. Seiberle and A. Schuster: Nature, 381, 212 (1996).

The alignment layer 23A and the alignment layer 23B may be manufactured by a rubbing process instead of the photo-alignment layer. In this case, the alignment layers 23A and 23B are manufactured by manufacturing various material layers applicable to the alignment layer such as polyimide, and then manufacturing a fine line-shaped uneven shape on the surface of the material layer by rubbing using a rubbing roll. Formed.
In addition, the alignment layer 23A and the alignment layer 23B are manufactured by forming a fine line-shaped concavo-convex shape manufactured by the rubbing process by a forming process instead of the alignment layer and the photo alignment layer by the rubbing process. May be.

[Spacer in liquid crystal]
The spacer 24 in the liquid crystal is provided to regulate the thickness of the liquid crystal layer 14 and various resin materials can be widely applied. In the present embodiment, the spacer 24 is made of a photoresist. The spacer 24 in the liquid crystal is formed by applying a photoresist on the base material 21B on which the second electrode 22B is formed, and exposing and developing. The spacer 24 in the liquid crystal may be provided in the first laminated body 12 for liquid crystal, or may be provided in both the first laminated body 12 for liquid crystal and the second laminated body 13 for liquid crystal. The in-liquid crystal spacer 24 may be provided on the alignment layer 23B. Further, a so-called bead spacer may be applied as the spacer. The bead spacer is not limited to a spherical shape, and may be a rod shape (cylindrical shape) or an elliptical spherical shape.
When a bead spacer is used as the spacer 24 in the liquid crystal, the bead spacer is disposed by being dispersed on the alignment layer after forming the alignment layer. In this case, from the viewpoint of suppressing the movement of the bead spacer in the liquid crystal layer 14 (on the alignment layer), a fixing layer formed of an adhesive or the like may be provided on the surface of the bead spacer.
Further, from the viewpoint of suppressing the movement of the bead spacers in the liquid crystal layer 14, the bead spacers are dispersed in advance in the resin for forming the alignment layer so that the bead spacers are arranged together with the formation of the alignment layer, or the liquid crystal layer is configured. It is also possible to disperse the bead spacers in advance in the liquid crystal material so that the bead spacers are arranged together with the formation of the liquid crystal layer. In addition, the bead spacer may be arranged in one of the first laminated body and the second laminated body as in the above-described photoresist spacer, and is arranged in each laminated body. You may be made to do.

[Liquid crystal layer]
Various liquid crystal materials applicable to this type of light control film can be widely applied to the liquid crystal layer 14. Specifically, a nematic liquid crystal compound, a smectic liquid crystal compound, and a cholesteric liquid crystal compound can be applied to the liquid crystal layer 14 as a liquid crystal compound having no polymerizable functional group.
Examples of nematic liquid crystal compounds include biphenyl compounds, terphenyl compounds, phenylcyclohexyl compounds, biphenylcyclohexyl compounds, phenylbicyclohexyl compounds, trifluoro compounds, phenyl benzoate compounds, and cyclohexyl phenylbenzoate compounds. , Phenylbenzoic acid phenyl compounds, bicyclohexyl carboxylic acid phenyl compounds, azomethine compounds, azo compounds, azooxy compounds, stilbene compounds, tolan compounds, ester compounds, bicyclohexyl compounds, phenyl pyrimidine compounds , Biphenylpyrimidine compounds, pyrimidine compounds, and biphenylethyne compounds.
Examples of smectic liquid crystal compounds include ferroelectric polymer liquid crystal compounds such as polyacrylate, polymethacrylate, polychloroacrylate, polyoxirane, polysiloxane, and polyester.
Examples of the cholesteric liquid crystal compound include cholesteryl linoleate, cholesteryl oleate, cellulose, cellulose derivatives, and polypeptides.
Moreover, as a commercial item, liquid crystal materials, such as Merck MLC2166, can be applied, for example. In the case of the guest-host method, the liquid crystal layer 14 is mixed with a liquid crystal material and a dye for dimming, but a mixture of a liquid crystal material and a dye proposed for the guest-host method can be widely applied. it can. In the liquid crystal cell 15, a sealing material 25 is disposed so as to surround the liquid crystal layer 14, and leakage of liquid crystal is prevented by the sealing material 25. Here, for example, an epoxy resin, an ultraviolet curable resin, or the like can be applied to the sealing material 25.

[Flexible printed circuit board]
A flexible printed wiring board 18 is arranged to electrically connect the first electrode 22A and the second electrode 22B to the outside. For example, as illustrated in FIG. 2, the flexible printed wiring board 18 is disposed between the first electrode 22A and the second electrode 22B in a region where the first electrode 22A and the second electrode 22B do not sandwich the liquid crystal layer 14. Can be connected. The flexible printed wiring board 18 is not limited to the form shown in FIG. 2, but may be, for example, a form not sandwiched between the first electrode 22A and the second electrode 22B, or the first electrode 22A and the second electrode 22B. It is good also as a form which connects only to one of these.

  Returning to FIG. 1, the first glass plate 33 </ b> A and the second glass plate 33 </ b> B are plate glasses disposed on the front and back surfaces of the laminated glass 1, respectively. In the present embodiment, the first glass plate 33A and the second glass plate 33B both use plate glass having a thickness of 2 mm. In the following description, the first glass plate 33A and the second glass plate 33B will be described as flat glass, but they may be curved glass or glass plates made up of 3D curved surfaces.

In the present embodiment, the first intermediate film forming sheet 31A and the second intermediate film forming sheet 31B are made of PVB (polyvinyl butyral) resin and have a thickness of 760 μm. The first intermediate film forming sheet 31A joins the first glass plate 33A and the light control film 10, and similarly, the second intermediate film formation sheet 31B is the second glass plate 33B and the light control film 10. And join. In a state where the laminated glass 1 is completed, the first intermediate film forming sheet 31A and the second intermediate film forming sheet 31B constitute a first intermediate film and a second intermediate film, respectively.
In addition, as a raw material of 31 A of 1st intermediate film formation sheets and the 2nd intermediate film formation sheet 31B, EVA (ethylene-vinyl acetate copolymer), PET (polyethylene terephthalate), COP (cycloolefin polymer) etc. are used. It may be used.

The spacer 32 is a region sandwiched between the first glass plate 33A and the second glass plate 33B and is disposed in at least a part of a region where the light control film 10 is not disposed. Therefore, the spacer 32 is arrange | positioned in the position used as the same plane as the light control film 10, and can fill the space | gap where the light control film 10 is not arrange | positioned. The spacer 32 is desirably thicker than the light control film 10. Further, if the spacer 32 is made of the same material as the first intermediate film forming sheet 31A and the second intermediate film forming sheet 31B, the first intermediate film forming sheet 31A and the second intermediate film forming sheet 31B are used. The joint strength can be increased.
In the present embodiment, the spacer 32 is formed in a hollow square, the outer shape is the same as the first glass plate 33A and the second glass plate 33B, and the inner hollow shape is the light control film 10. It is comprised equivalent to the external shape. Therefore, the spacer 32 will be arrange | positioned so that the space | gap in which the light control film 10 is not arrange | positioned may be filled up.

  The inclination reducing member 34 is a member that reduces the relative inclination between the first glass plate 33 </ b> A and the second glass plate 33 </ b> B in the laminated body 30 generated by the thickness of the flexible printed wiring board 18. For example, as shown in FIG. 1, the inclination reducing member 34 is disposed at a position facing the flexible printed wiring board 18 with the light control film 10 interposed therebetween. The arrangement position of this inclination relaxation member 34 is an example, and may be arranged at an optimal position according to the size and shape of the laminated glass 1. Further, it is desirable that the inclination relaxing member 34 has the same thickness as the flexible printed wiring board 18. Further, it is desirable that the inclination reducing member 34 is made of the same material as that of the flexible printed wiring board 18 or a material close thereto.

Next, the manufacturing method of the laminated glass 1 is demonstrated.
FIG. 3 is a flowchart illustrating a method for manufacturing the laminated glass 1.
FIG. 4 is a flowchart showing in more detail the laminated body arranging step in FIG.
The production of the laminated glass 1 starts from performing a laminated body arranging step in step (hereinafter simply referred to as “S”) 10. This laminated body arrangement | positioning process is demonstrated with reference to FIG.

  In S11, the 2nd glass plate 33B is arrange | positioned (2nd glass plate arrangement | positioning process). In addition, when using the 2nd contact plate 41B mentioned later, after arrange | positioning the 2nd contact plate 41B, the 2nd glass plate 33B is arrange | positioned.

  In S12, the 2nd intermediate film formation sheet 31B is arrange | positioned on the 2nd glass plate 33B (2nd intermediate film formation sheet arrangement | positioning process).

  In S13, the light control film (liquid crystal film) 10 is arrange | positioned on the 2nd intermediate film formation sheet 31B (liquid crystal film arrangement | positioning process). Here, in this embodiment, since the flexible printed wiring board 18 is already connected to the light control film 10, the flexible printed wiring board 18 is also arrange | positioned by this S13 (flexible printed wiring board arrangement | positioning process).

  In S14, the inclination reducing member 34 is arranged at the predetermined position described above (inclination reducing member arrangement step).

  In S15, the spacer 32 is disposed on the second intermediate film forming sheet 31B and at a position where the light control film 10 is not disposed. The spacer 32 overlaps with the flexible printed wiring board 18 and the inclination relaxing member 34. However, since the spacer 32 is deformed by a subsequent pressurizing step or the like, it overlaps as it is without any trouble.

  In S16, the first intermediate film forming sheet 31A is arranged on the light control film 10 and the spacer 32 (first intermediate film forming sheet arranging step).

In S17, the first glass plate 33A is arranged on the first intermediate film forming sheet 31A (first glass plate arranging step).
The arrangement (temporary lamination) of the laminated body 30 is completed through the above steps.

FIG. 5 is a diagram for explaining a laminated body support structure 50 configured in the manufacturing process of the laminated glass 1.
Since the structural members of the laminated body 30 are not fixed to each other, there is a possibility that positional deviation may occur during the manufacturing process. Moreover, since the laminated glass 1 of this embodiment becomes the structure which inserted | pinched the light control film 10, it is a pressure equally to the 1st glass plate 33A and the 2nd glass plate 33B in the below-mentioned pressurization process. It is necessary to apply. Therefore, in the present embodiment, the laminate support structure 50 that can stably hold the laminate 30 during the manufacturing process is configured.

  The laminated body support structure 50 of the present embodiment includes a laminated body 30, a first contact plate 41A, a second contact plate 41B, and a support body 43.

  41A of 1st contact plates and 41B of 2nd contact plates are members arrange | positioned so that the laminated body 30 may be pinched | interposed from the upper and lower sides. The first and second contact plates 41A and 41B may be made of glass having a thickness equal to or greater than that of the first and second glass plates 33A and 33B. The first caulking plate 41A and the second caulking plate 41B are made of glass having a thickness larger than that of the first glass plate 33A and the second glass plate 33B. The main purpose is to prevent the second glass plate 33B from being bent. Therefore, the first contact plate 41A and the second contact plate 41B are not limited to glass, and may be composed of other members. Note that when the rigidity of the first glass plate 33A and the second glass plate 33B is sufficiently high, the first contact plate 41A and the second contact plate 41B may be omitted.

The support body 43 is a frame-shaped member disposed along the outer periphery of the stacked body 30. The support 43 is made of a material having higher rigidity than the first intermediate film-forming sheet 31A and the second intermediate film-forming sheet 31B in the pressurizing step described later. In this embodiment, a square bar made of glass is used.
Further, the height of the support 43 is within an appropriate range with respect to the height at which the laminated body 30, the first pad 41A and the second pad 41B are overlapped (the difference in height is within a predetermined value). ) Is required. Details of this height will be described later. In addition, when manufacturing laminated glass without using the first contact plate 41 </ b> A and the second contact plate 41 </ b> B, the height of the support 43 is an appropriate range in comparison with the height of the laminated body 30. It is necessary to be within.

  In addition, although the support body 43 showed the example which is each a member comprised by the frame shape, it is not restricted to this, The structure which becomes easy to attach or detach around the laminated body 30 as a structure which can be disassembled partially. It is good.

  Returning to FIG. 3, in S20, the support body 43 is arrange | positioned around the laminated body 30 (support body arrangement | positioning process).

In S30, a vacuum process is performed in which the inside of the laminate is evacuated.
In this embodiment, this vacuum process and a pressurizing process described later are performed by a technique called prelaminating by a vacuum laminator.
FIG. 6 is a diagram for explaining an outline of pre-laminating by a vacuum laminator.
In the prelaminating process using the vacuum laminator, the pressure vessel 61 having two spaces of the first chamber 61A and the second chamber 61B is used. A silicon rubber sheet 64 is provided at the boundary between the first chamber 61A and the second chamber 61B, so that an airtight state can be maintained between the first chamber 61A and the second chamber 61B. The first chamber 61A and the second chamber 61B are provided with vent holes 62 and 63, respectively, and are independently connected to an external air pump. Therefore, the first chamber 61A and the second chamber 61B can control the degree of decompressing each space independently. In addition, a heater is built in the bottom surface of the first chamber 61A, and the workpiece in the first chamber 61A can be heated.

  In S30, the stacked body support structure 50 is disposed in the first chamber 61A, and both the first chamber 61A and the second chamber 61B are evacuated to remove air remaining in the stack support structure 50. To do. The vacuum process of this embodiment was performed at room temperature.

Returning to FIG. 3, in S <b> 40, pressure is applied to the stacked body 30 together with the stacked body support structure 50 (pressurizing step). Here, the pressurizing step is performed in a state where the laminate 30 is heated. In the present embodiment, the laminate 30 is heated together with the laminate support structure 50. Further, the pressurizing step is performed at a pressure of 0.5 atm or less. This pressure will be described later.
The pressurizing process of S40 is performed continuously following the vacuum process of S30, and is performed while the stacked body support structure 50 is kept in a vacuum state in the first chamber 61A of the pressure vessel 61 described above. In the pressurizing step, the first chamber 61A is maintained in a vacuum state, and the inside of the second chamber 61B is pressurized, and the pressure difference between the first chamber 61A and the second chamber 61B is applied to the stacked body 30. Adjust to match. For example, when 0.5 atm is applied to the laminate 30, the suction in the second chamber 61B is suppressed or stopped so that air corresponding to 0.5 atm flows into the second chamber 61B. To.

FIG. 7 is a diagram schematically showing the state of the silicon rubber sheet 64 in the pressurizing step.
When air is fed into the second chamber 61B and pressure is applied from the second chamber 61B to the first chamber 61A, the silicon rubber sheet 64 is pushed toward the first chamber 61A by this pressure, and the silicon rubber sheet 64 Is in close contact with the laminate support structure 50 and pressure is applied to the laminate support structure 50 as well.
In the pressurization process of this embodiment, the state of Tg ± 10 ° C. and 0.5 atm of the first intermediate film forming sheet 31A and the second intermediate film forming sheet 31B was maintained.
When the pressurizing step is finished, the pre-lamination as a laminated glass is finished.

  In S50, an autoclave process is performed. In this autoclave process, the laminated body 30 that has been pre-laminated is transferred to a pressure vessel for autoclave, and the laminated body 30 is placed in a high-pressure and high-temperature environment for a predetermined time to strengthen the bonding as a laminated glass to increase the strength. In the present embodiment, the autoclave process is performed by placing the laminate 30 after pre-laminating (after the pressurizing process) in an environment of 120 ° C. and 8 atm. When the autoclave process is completed, the laminated glass 1 is completed. In addition, the following excision process can also be performed as needed.

  In S60, the cutting process which cuts off a part of outer periphery of the laminated body 30 (laminated glass 1) which the autoclave process was completed is performed. Note that this excision step may not be performed.

Next, various parameters in the pressurizing process will be mainly described.
FIG. 8 is a table summarizing experimental results obtained by examining the influence of changes in pressure conditions on the pre-laminate results.
The experiment shown in FIG. 8 is an experiment in which the pressure in the pressurizing process is changed. Other conditions are constant under the conditions described above. The size of the test piece (laminated glass) used in the experiment is a square having a side of 100 mm. The contents of the evaluation are the presence or absence of occurrence of liquid crystal bias and the presence or absence of generation of bubbles in the cell. In addition, although bubble generation is expressed here as a bubble, it is a state in which space is generated, and it does not matter whether it is in a vacuum state or contains gas. Judgment result ○ indicates that the liquid crystal is not biased or that bubbles in the cell do not occur, Δ indicates that it occurs very rarely in a plurality of experiments, and × occurs frequently. Is.
From the result of FIG. 8, it can be said that the pressure in the pressurizing step is desirably 0.5 atm or less. More preferably, it is 0.25 atm or less. Although the lower limit is not described, since the autoclave process is performed after the pre-laminate, it is sufficient that the laminate 30 is integrated in this pre-laminate, and even a slight pressure is applied. Therefore, there is no need to set a lower limit.

FIG. 9 is a diagram showing the experimental results of examining the height relationship between the support and the laminate.
The experiment shown in FIG. 9 was performed by changing the height of the support. In addition, a distance of 5 mm was provided between the support and the laminate 30.
From the results of FIG. 9, it can be said that the difference in height obtained by subtracting the height of the laminate and the backing plate from the height of the support is preferably −10 mm or more and 5 mm or less. More desirably, the difference in height obtained by subtracting the height of the laminate and the backing plate from the height of the support is −5 mm or more and 0 mm or less. The appropriate range of this height difference is the difference between the height of the support and the height of the laminated body minus the height of the backing plate when using a backing plate. When is not used, it is a difference in height obtained by subtracting the height of the laminate from the height of the support.

FIG. 10 is a diagram showing experimental results obtained by examining the influence of the distance between the support and the laminated body.
The experiment shown in FIG. 10 was performed by changing the distance between the support and the laminate. In addition, it experimented on the conditions with no difference in the height of a support body and a laminated body.
From the result of FIG. 10, it can be said that the distance between the support and the laminate is desirably 20 mm or less. More desirably, the distance between the support and the laminate is 10 mm or less.

As described above, an appropriate range exists in the positional relationship between the support and the laminated body. And the success rate of a pre-laminate improves dramatically by arrange | positioning a support body in this appropriate position. The reason for this will be described.
The light control film 10 has a liquid crystal layer formed therein, and the laminated glass that sandwiches the light control film 10 sandwiches a soft material that is impossible with conventional laminated glass. Accordingly, in the prelaminating pressurization step, if there is even a slight deviation in the pressure application method, the liquid crystal layer flows due to the influence, and liquid crystal pools and voids are formed in the light control film 10. Will occur. In particular, in the pre-laminating process using a vacuum laminator, the silicon rubber sheet 64 presses the outer peripheral portion of the laminated body 30, that is, the outer peripheral portion of the first glass plate 33A or the second glass plate 33B when pressed. It is conceivable that the first glass plate 33A or the second glass plate 33B is distorted.

  In the present embodiment, by disposing the support around the first glass plate 33A, it is possible to prevent unnecessary pressing force from being applied to the outer peripheral portion of the first glass plate 33A or the second glass plate 33B. And it is possible to apply a pressure equally to the 2nd glass plate 33B. Therefore, it is possible to appropriately pre-laminate without causing unnecessary flow or the like in the liquid crystal layer. Therefore, the manufacturing method of the laminated glass which can reduce generation | occurrence | production of a liquid crystal pool and a space | gap can be provided.

  In the experiment described above, one side was 100 mm. However, if the support is placed at the appropriate position described above, a good pre-lamination result can be obtained. It was confirmed using glass, and from this result, it was confirmed that the same was true for a larger size laminated glass.

  Finally, since it has the result of having examined in the process leading to this invention about the temporary fixation by the tape which is the holding method of the laminated body 30 in the pressurization process performed conventionally, it is a comparative example with respect to this embodiment. The disclosure is made as follows.

FIG. 11 is a diagram illustrating a result of performing a pressing process by changing the type (thickness) of the tape.
FIG. 13 is a view showing a form in which the tape T is provided at the four corners of the upper and lower surfaces of the laminate 30.
In the experiment of FIG. 11, the support body 43 is not used. Moreover, the tape was provided in four corners of the upper and lower surfaces of the laminated body 30 (see FIG. 13). The tape T is folded back as shown by the arrows in FIG. 13, and the tape is attached to the upper and lower surfaces and the side surfaces.
From the results shown in FIG. 11, the thinner the tape, the better. However, none of the results was satisfactory. Good results have been obtained without tape.

FIG. 12 is a diagram showing a result of performing the pressing process by changing the tape application position and the number of applications.
FIG. 14 is a view showing a form in which the tape T is provided at the two upper and lower corners of the laminate 30.
FIG. 15 is a view showing a form in which the tape T is provided on the four upper and lower sides of the laminate 30.
FIG. 16 is a view showing a form in which the tape T is provided on the two upper and lower sides of the laminate 30.
FIG. 17 is a view showing a form in which the tape T is provided on the four sides of the laminated body 30.
FIG. 18 is a view showing a form in which the tape T is provided on the two side surfaces of the laminated body 30.
From the result of FIG. 12, if a tape is pasted, a good result is obtained by pasting along only the side surface.

(Deformation)
The present invention is not limited to the embodiment described above, and various modifications and changes are possible, and these are also within the scope of the present invention.

(1) In the embodiment, the VA type liquid crystal light control film has been described. However, the present invention is not limited to this, and may be another method in which the light control amount can be adjusted by a potential difference.
For example, a TN system (twisted nematic) may be used as a liquid crystal light control film other than the VA system. In the TN system, when the voltage is not applied to the light control film, the liquid crystal molecules are aligned horizontally, and the light is allowed to pass through and the screen becomes “white”. When voltage is applied gradually, the liquid crystal molecules rise vertically and block the light and the screen becomes black.

(2) In the embodiment, the case where the liquid crystal cell is sandwiched between linear polarizing plates to form a light control film has been described. However, the present invention is not limited to this, and linear polarization using a guest-host type liquid crystal layer is used. The present invention can be widely applied to the case where the light control film is constituted by omitting the plate.

(3) In the embodiment, the spacer 32 has been described with an example in which the spacer 32 is configured in a frame shape so as to surround the entire periphery of the light control film 10. For example, a linear spacer may be partially arranged, and the shape and arrangement of the spacer can be appropriately changed.

(4) In the embodiment, the inclination reducing member 34 has a rectangular shape and has been described with an example in which the inclination reducing member 34 is disposed at a position facing the flexible printed wiring board 18. For example, a frame-shaped inclination reducing member may be arranged, and the shape and arrangement of the inclination reducing member can be appropriately changed.

(5) In the embodiment, the pressurizing step has been described by giving an example using prelaminating by a vacuum laminator. For example, the pressurization process may be performed using a thermal laminator, and the present invention can be applied to a vacuum bag method or a tube method.

  Each embodiment and modification may be used in appropriate combination, but detailed description is omitted. Further, the present invention is not limited by the embodiments described above.

DESCRIPTION OF SYMBOLS 1 Laminated glass 10 Light control film 12 1st laminated body 13 for liquid crystals 2nd laminated body 14 for liquid crystals Liquid crystal layer 15 Liquid crystal cell 16 Linear polarizing plate 17 Linear polarizing plate 18 Flexible printed wiring board 21A Base material 21B Base material 22A 1st electrode 22B Second electrode 23A Alignment layer 23B Alignment layer 24 Liquid crystal spacer 25 Sealing material 30 Laminate 31A First intermediate film formation sheet 31B Second intermediate film formation sheet 32 Spacer 33A First glass plate 33B Second glass plate 34 Inclination alleviating member 41A First contact plate 41B Second contact plate 43 Support body 50 Laminate support structure 61 Pressure vessel 61A First chamber 61B Second chamber 62 Vent hole 63 Vent hole 64 Silicon rubber sheet

Claims (11)

A method for producing a laminated glass using a laminate in which a liquid crystal film is sandwiched between a first glass plate and a second glass plate,
A support arrangement step of arranging a support along the outer periphery of the laminate;
A pressurizing step of applying pressure to at least one plate surface of the first glass plate and the second glass plate in a state where the support is disposed along the outer periphery of the laminate;
A method for producing laminated glass. In the manufacturing method of the laminated glass of Claim 1,
In the laminated body, a first glass plate, a first intermediate film forming sheet, a liquid crystal film, a second intermediate film forming sheet, and a second glass plate are laminated in this order. ,
The support is made of a material having higher rigidity than the first intermediate film-forming sheet and the second intermediate film-forming sheet in the pressing step;
The manufacturing method of the laminated glass characterized by these. In the manufacturing method of the laminated glass of Claim 1 or Claim 2,
The pressurizing step is performed at a pressure of 0.5 atm or less;
The manufacturing method of the laminated glass characterized by these. In the manufacturing method of the laminated glass in any one of Claim 1- Claim 3,
The height difference obtained by subtracting the height of the laminate from the height of the support is −10 mm or more and 5 mm or less,
However, the height of the laminate includes the height of the backing plate, if a backing plate is used,
The manufacturing method of the laminated glass characterized by these. In the manufacturing method of the laminated glass in any one of Claim 1- Claim 4,
The distance between the support and the laminate is 20 mm or less,
The manufacturing method of the laminated glass characterized by these. In the manufacturing method of the laminated glass in any one of Claim 1- Claim 5,
The pressurizing step is performed in a state where the laminate is heated;
The manufacturing method of the laminated glass characterized by these. In the manufacturing method of the laminated glass in any one of Claim 1- Claim 6,
A step performed before the pressurizing step, further comprising a vacuum step of making the inside of the laminate a vacuum state;
The manufacturing method of the laminated glass characterized by these. In the manufacturing method of the laminated glass in any one of Claim 1- Claim 7,
Further comprising an autoclave step of heating by applying a pressure higher than the pressure in the pressurization step after performing the pressurization step;
The manufacturing method of the laminated glass characterized by these. In the manufacturing method of the laminated glass of Claim 8,
After the autoclave step, further comprising a cutting step of cutting at least a part of the outer shape of the laminated glass;
The manufacturing method of the laminated glass characterized by these. In the manufacturing method of the laminated glass in any one of Claim 1- Claim 9,
A spacer in which a spacer thicker than the liquid crystal film is disposed in at least a part of a region sandwiched between the first glass plate and the second glass plate and in which the liquid crystal film is not disposed. Further comprising a placement step;
The manufacturing method of the laminated glass characterized by these. In the manufacturing method of the laminated glass in any one of Claim 1- Claim 10,
A flexible printed wiring board placement step of placing at least a part of the flexible printed wiring board at a position sandwiched between the first glass plate and the second glass plate;
An inclination relaxation member is sandwiched between the first glass plate and the second glass plate at a position different from the position where the flexible printed wiring board is sandwiched between the first glass plate and the second glass plate. An inclination relaxation member placement step to be placed on,
Further comprising
The manufacturing method of the laminated glass characterized by these.

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