Laminated glass manufacturing method

Abstract

To provide a method for manufacturing a laminated glass which can suppress formation of air bubbles in an intermediate resin layer.SOLUTION: A method for manufacturing a laminated glass includes a laminate formation step and an intermediate resin layer formation step. The laminate formation step forms a laminate 16 having a laminated structure of a pair of glass plates 12, and an intermediate film layer 17 where a resin film F is arranged between the pair of glass plates 12. The intermediate resin layer formation step heats the laminate 16, and thereby bonds the intermediate film layer 17 and the pair of glass plates 12, and forms an intermediate resin layer. A resin film F of the laminate 16 has a first resin film F1, and a second resin film F2 which is arranged adjacent to the first resin film F1 and can be fused to the first resin film F1. The intermediate film layer 17 of the laminate 16 has an overlapping part 17a where a part of the first resin film F1 and a part of the second resin film F2 overlap each other.SELECTED DRAWING: Figure 7

Description

[Technical Field]

[0001] The present invention relates to a method for producing laminated glass. [Background technology]

[0002] BACKGROUND ART Laminated glass used as fire-resistant glass, for example, has been known in the past. Such laminated glass has a laminated structure of a pair of glass sheets and an intermediate resin layer provided between the pair of glass sheets.

[0003] The intermediate resin layer in the laminated glass described in Patent Document 1 has an adhesive portion that is bonded to the glass sheets and a weak adhesive portion that has a lower adhesive strength to the glass sheets than the adhesive portion. The weak adhesive portion of the intermediate resin layer extends from the outer peripheral edge of the intermediate resin layer toward the inside of the intermediate resin layer in a plan view. This configuration makes it easier for gaps to form between the weak adhesive portion of the intermediate resin layer and the glass sheets when the laminated glass is heated during a fire. The gap formed by the weak adhesive portion that extends from the outer peripheral edge of the intermediate resin layer toward the inside of the intermediate resin layer in a plan view serves as an exhaust path for gas between the intermediate resin layer and the glass sheets to be exhausted to the outer peripheral edge of the intermediate resin layer. This prevents gas from accumulating between the pair of glass sheets, thereby improving the fire resistance of the laminated glass.

[0004] As described in Patent Document 1, an intermediate resin layer having a low-adhesion portion can be formed, for example, using multiple resin films. More specifically, to form an intermediate resin layer having a low-adhesion portion, multiple resin films are first placed between a pair of glass plates so that the peripheral end faces of the resin films face each other. This forms a laminate having a laminated structure of a pair of glass plates and an intermediate film layer made of multiple resin films. The intermediate film layer of this laminate has a discontinuous portion where the peripheral end faces of the multiple resin films face each other. Next, the laminate is heated and pressurized to bond the intermediate film layer to the pair of glass plates. This allows the low-adhesion portion of the intermediate resin layer to be formed from the discontinuous portion of the intermediate film layer. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Patent Publication No. 2021-088500 Summary of the Invention [Problem to be solved by the invention]

[0006] As described above, when the intermediate film layer of a laminate for obtaining laminated glass is composed of multiple resin films, at least one of the adjacent resin films may move during transport of the laminate, widening the gap between the adjacent resin films. If the gap between the adjacent resin films widens excessively due to the relative movement of the adjacent resin films, relatively large bubbles are likely to form in the intermediate resin layer of the laminated glass. These bubbles in the intermediate resin layer are one factor that reduces the appearance quality of the laminated glass.

[0007] An object of the present invention is to provide a method for producing laminated glass that can suppress the formation of bubbles in the intermediate resin layer. [Means for solving the problem]

[0008] A method for manufacturing laminated glass that solves the above-mentioned problems is a method for manufacturing laminated glass having a laminated structure of a pair of glass plates and an intermediate resin layer provided between the pair of glass plates, and includes a laminate forming step of forming a laminate having a laminated structure of the pair of glass plates and an intermediate film layer in which a resin film is disposed between the pair of glass plates, and an intermediate resin layer forming step of heating the laminate to bond the intermediate film layer and the pair of glass plates to form the intermediate resin layer, wherein the resin film is a first resin film and a second resin film disposed adjacent to the first resin film. can a second resin film, the first resin film has a first edge, and the second resin film has a second edge, and the shape of the second edge in a plan view includes at least one of a curved shape and a bent shape that is convex toward the first resin film, The intermediate film layer of the laminate is The first edgea part of the second resin film The second edge There is an overlapping portion where the two parts overlap.

[0009] When the laminate obtained in the laminate formation step is transported to the next step, the first resin film and the second resin film move relative to each other in directions away from each other. At this time, the intermediate film layer of the laminate has the overlapping portion described above, so that the gap dimension between the first resin film and the second resin film can be kept small.

[0010] In the above-described method for manufacturing laminated glass, the overlapping portion may be located inside the outer peripheral edges of the pair of glass sheets in a plan view of the laminate. According to this method, even when a force is applied in a direction that brings the pair of glass sheets closer together, unnecessary bending stress caused by the overlapping portion between the first resin film and the second resin film is unlikely to occur at the outer peripheral edges of the glass sheets. This makes it possible to prevent cracks in the glass sheets.

[0011] In the above-described method for manufacturing laminated glass, the overlapping portions may be located at a position spaced apart by 10 mm or more from the outer peripheral edges of the pair of glass sheets in a plan view of the laminate. This method can further reduce the occurrence of the above-described unnecessary bending stress at the outer peripheral edges of the glass sheets, thereby further reducing the occurrence of cracks in the glass sheets.

[0012] In the above-described method for manufacturing laminated glass, the outer peripheral edge of the first resin film and the outer peripheral edge of the second resin film of the laminate may be spaced apart at positions along the outer peripheral edges of the pair of glass sheets. This method can further reduce the occurrence of the above-described unnecessary bending stress at the outer peripheral edges of the glass sheets, thereby further reducing the occurrence of cracks in the glass sheets.

[0013] In the method for manufacturing laminated glass, the distance between the outer peripheral edges of the first resin film and the second resin film at a position along the outer peripheral edges of the pair of glass plates may be 1 mm or more.

[0014] In the above-described method for manufacturing laminated glass, the laminate-forming step is a step of obtaining the laminate by disposing the resin film between the pair of glass plates in a horizontal orientation, and the method may further include a position-changing step of changing the orientation of the laminate to a vertical orientation between the laminate-forming step and the intermediate resin layer-forming step.

[0015] In the position change process, the force of the pair of glass plates sandwiching the first and second resin films tends to be reduced, which tends to increase the amount of relative movement between the first and second resin films, making the laminate with the overlapping portion particularly advantageous.

[0016] In the above-mentioned method for manufacturing laminated glass, the pair of glass plates may have sides of 1000 mm or more. When the dimensions of the pair of glass plates are relatively large, it may be difficult to obtain a resin film that matches those dimensions. In the above-mentioned method for manufacturing laminated glass, multiple resin films F are used, so that an intermediate film layer of relatively large dimensions can be formed from resin films of existing dimensions. [Effects of the Invention]

[0017] According to the present invention, it is possible to suppress the formation of bubbles in the intermediate resin layer. [Brief explanation of the drawings]

[0018] [Figure 1] FIG. 1 is a plan view showing a part of a laminated glass according to an embodiment of the present invention, with a cutaway view. [Figure 2] FIG. 2 is a partial cross-sectional view taken along line 2-2 in FIG. [Figure 3] FIG. 3 is an enlarged cross-sectional view showing a main part of FIG. 2. [Figure 4] FIG. 4 is a cross-sectional view taken along line 4-4 in FIG. [Figure 5] FIG. 2 is a cross-sectional view illustrating the function of laminated glass. [Figure 6]FIG. 10 is a perspective view illustrating a laminate forming step. [Figure 7] FIG. 2 is a plan view showing a part of the laminated body cut away. [Figure 8] FIG. 8 is a partial cross-sectional view taken along line 8-8 in FIG. 7. [Figure 9] FIG. [Figure 10] FIG. 10 is a perspective view showing a laminated body with a sealing member attached thereto. [Figure 11] FIG. 11 is a cross-sectional view taken along line 11-11 in FIG. [Figure 12] 1(a) to 1(c) are partial cross-sectional views of a laminate. [Figure 13] FIG. 10 is a partial side view showing a laminated body of a first modified example. [Figure 14] FIG. 10 is a partial side view showing a laminated body of a first modified example. [Figure 15] FIG. 10 is a partial side view showing a laminated body of a second modified example. DETAILED DESCRIPTION OF THE INVENTION

[0019] Hereinafter, one embodiment of a method for manufacturing laminated glass will be described with reference to the drawings. Note that in the drawings, for the sake of convenience, some components may be shown exaggerated or simplified. Furthermore, the dimensional ratios of each part may differ from the actual ratios.

[0020] As shown in FIGS. 1 and 2, the laminated glass 11 of this embodiment has a laminated structure of a pair of glass plates 12 and an intermediate resin layer 13 provided between the pair of glass plates 12. <Glass plate 12 of laminated glass 11> Examples of the glass plates 12 of the laminated glass 11 include silicate glass, silica glass, borosilicate glass, soda-lime glass, aluminosilicate glass, alkali-free glass, and crystallized glass. The glass plates 12 may be tempered glass, which is glass that has been tempered by air cooling or chemical strengthening, or untempered glass with a functional film such as an anti-reflection film formed on the surface. For example, a laminated glass 11 using low-thermal expansion glass such as crystallized glass is suitable for use as fire safety glass. The thickness and outer dimensions of the glass plates 12 are not particularly limited. The glass plates 12 of the laminated glass 11 may have sides of 1000 mm or more. The thickness of the glass plates 12 is preferably in the range of, for example, 2 mm or more and 10 mm or less. The types of the pair of glass plates 12 may be the same or different. The thicknesses of the pair of glass plates 12 may be the same or different.

[0021] <Intermediate resin layer 13 of laminated glass 11> In plan view, the intermediate resin layer 13 of the laminated glass 11 has an adhesive portion 14 that is bonded to the glass plate 12, and a weak adhesive portion 15 that has a lower adhesive strength to the glass plate 12 than the adhesive portion 14. The weak adhesive portion 15 of the intermediate resin layer 13 extends from the outer peripheral edge of the intermediate resin layer 13 toward the inside of the intermediate resin layer 13 in plan view.

[0022] The intermediate resin layer 13 has a first low-adhesion portion 15a extending from a first outer peripheral edge 13a and a second low-adhesion portion 15b extending from a second outer peripheral edge 13b at a position different from the first outer peripheral edge 13a. The first low-adhesion portion 15a and the second low-adhesion portion 15b are arranged so as to be connected inside the intermediate resin layer 13. In this embodiment, the first low-adhesion portion 15a extends from the first outer peripheral edge 13a toward the central portion of the intermediate resin layer 13 in a planar view. The second low-adhesion portion 15b extends from the second outer peripheral edge 13b toward the central portion of the intermediate resin layer 13 in a planar view. The first low-adhesion portion 15a and the second low-adhesion portion 15b are connected in the central portion of the intermediate resin layer 13 in a planar view.

[0023] As shown in FIG. 3 , the intermediate resin layer 13 of this embodiment includes a resin substrate layer L1 and adhesive layers L2 provided on both main surfaces of the resin substrate layer L1. The low-adhesion portion 15 of the intermediate resin layer 13 includes only the resin substrate layer L1 out of the resin substrate layer L1 and adhesive layer L2. The adhesive portion 14 of the intermediate resin layer 13 includes both the resin substrate layer L1 and the adhesive layer L2. The low-adhesion portion 15 refers to a portion with no adhesive strength at all, or a portion that is adhesive but has lower adhesive strength than the adhesive portion 14. The low-adhesion portion 15 may also include a portion that has lower adhesive strength to one glass plate 12 than the adhesive portion 14, but has equal adhesive strength to the other glass plate 12 as the adhesive portion 14.

[0024] Examples of resins constituting the resin substrate layer L1 of the intermediate resin layer 13 include polyvinyl butyral (PVB), ethylene-vinyl acetate copolymer (EVA), polyethylene terephthalate (PET), polycarbonate (PC), polyvinyl chloride (PVC), polyvinylidene chloride (PVDC), acrylic resins, and fluorine-based resins. The resin substrate layer L1 may have a single-layer structure or a multi-layer structure. From the viewpoint of further improving the fire resistance of the laminated glass 11, the resin constituting the resin substrate layer L1 is preferably a fluorine-based resin. Examples of monomers constituting the fluorine-based resin include tetrafluoroethylene (TFE), hexafluoropropylene (HFP), vinylidene fluoride (VDF), polychlorotrifluoroethylene (PCTFE), vinyl fluoride (VF), and perfluoroalkyl vinyl ether (PFA). As the fluorine-based resin, tetrafluoroethylene (TFE)-hexafluoropropylene (HFP)-vinylidene fluoride (VDF) copolymer (THV) is preferred.

[0025] The thickness of the resin substrate layer L1 is preferably within a range of, for example, 0.2 mm or more and 2 mm or less. Examples of adhesives that constitute the adhesive layer L2 of the intermediate resin layer 13 include acrylic adhesives, fluorine-based adhesives, silicone adhesives, and vinyl adhesives. The adhesive preferably contains a silane coupling agent to enhance adhesion to the glass plate 12. The thickness of the adhesive layer L2 is preferably within a range of, for example, 0.001 μm or more and 5 μm or less.

[0026] <11 Functions of Laminated Glass> Next, the function of the laminated glass 11 will be described. 4 and 5 show the laminated glass 11 in use. When the glass surfaces of the laminated glass 11 are heated during a fire, the temperature of the intermediate resin layer 13 of the laminated glass 11 rises, causing gas to be generated from the intermediate resin layer 13. In this case, the intermediate resin layer 13 of the laminated glass 11 of this embodiment has a low-bonding portion 15 that has lower adhesive strength to the glass sheet 12 than the adhesive portion 14. Therefore, when the laminated glass 11 is heated during a fire, a gap is likely to form between the low-bonding portion 15 of the intermediate resin layer 13 and the glass sheet 12. Furthermore, the low-bonding portion 15 of the intermediate resin layer 13 extends inward from the outer peripheral edge of the intermediate resin layer 13 in a plan view. Therefore, the gap between the low-bonding portion 15 of the intermediate resin layer 13 and the glass sheet 12 serves as an exhaust path for exhausting gas between the intermediate resin layer 13 and the glass sheet 12 to the outer peripheral edge of the intermediate resin layer 13, as shown by the arrow in FIG. 5 . This facilitates the exhaust of gas between the intermediate resin layer 13 and the glass sheet 12. In this embodiment, the exhaust path along the first low-adhesion portion 15a can promote the exhaust of gas from the first outer peripheral edge 13a of the intermediate resin layer 13. In addition, the exhaust path along the second low-adhesion portion 15b can promote the exhaust of gas from the second outer peripheral edge 13b of the intermediate resin layer 13.

[0027] <11 Manufacturing Methods for Laminated Glass> Next, a method for manufacturing the laminated glass 11 will be described. As shown in Figures 6 and 7, the method for manufacturing laminated glass 11 includes a laminate formation step of forming a laminate 16. The laminate 16 has a laminated structure of a pair of glass plates 12 and an intermediate film layer 17 in which a resin film F is disposed between the pair of glass plates 12. The resin film F has a first resin film F1 and a second resin film F2. The second resin film F2 is disposed adjacent to the first resin film F1 and can be fused to the first resin film F1. The material of the first resin film F1 and the material of the second resin film F2 are preferably the same. The thickness of the first resin film F1 and the thickness of the second resin film F2 are preferably the same.

[0028] As shown in Fig. 7, the first resin film F1 has a first edge E1 that is linear in plan view. The second resin film F2 has a second edge E2 that is curved and convex toward the first resin film F1 in plan view. A portion of the first edge E1 of the first resin film F1 overlaps the second resin film F2. In addition, a portion of the second edge E2 of the second resin film F2 overlaps the first resin film F1.

[0029] As shown in FIGS. 7 and 8, the intermediate film layer 17 of the laminate 16 has an overlapping portion 17a where a part of the first resin film F1 and a part of the second resin film F2 overlap each other.

[0030] 7, the overlapping portion 17a of the intermediate film layer 17 is located inside the outer peripheral edges of the pair of glass plates 12 in a plan view of the laminate 16. The distance D1a between the overlapping portion 17a and the outer peripheral edges of the pair of glass plates 12 is preferably 10 mm or more, more preferably 15 mm or more, and even more preferably 20 mm or more.

[0031] As shown in FIG. 8, in the overlapping portion 17a, a width dimension D1b along the direction in which the first resin film F1 and the second resin film F2 are adjacent to each other is preferably within a range of, for example, 1 mm or more and 10 mm or less.

[0032] 7 and 9, the outer peripheral edge of the first resin film F1 and the outer peripheral edge of the second resin film F2 are spaced apart at a position along the outer peripheral edges of the pair of glass plates 12 of the laminate 16. The distance D2 between the outer peripheral edge of the first resin film F1 and the outer peripheral edge of the second resin film F2 at a position along the outer peripheral edges of the pair of glass plates 12 is preferably 1 mm or more.

[0033] The method for manufacturing the laminated glass 11 includes an intermediate resin layer forming step of heating the laminate 16 to bond the intermediate film layer 17 and the pair of glass sheets 12 together to form the intermediate resin layer 13 of the laminated glass 11. The method for manufacturing the laminated glass 11 may further include an orientation change step of changing the orientation of the laminate 16 from the horizontal orientation shown in Fig. 11 to the vertical orientation shown in Fig. 12(a).

[0034] In the intermediate resin layer forming step, it is preferable to first perform a degassing process to evacuate the periphery of the laminate 16, thereby discharging the gas between the pair of glass plates 12. The degassing process can be performed, for example, with a sealing member 18 attached to the periphery of the laminate 16, as shown in FIGS. 10 and 11 . The sealing member 18 is made of, for example, a rubber material and is in close contact with the peripheries of the pair of glass plates 12. The sealing member 18 has an exhaust section (not shown), and a degassing process to evacuate the inside of the sealing member 18 through the exhaust section can be performed. Note that such a degassing process can also be performed, for example, by preparing a bag capable of sealing the laminate 16 and evacuating the bag containing the laminate 16.

[0035] In the intermediate resin layer forming step, it is preferable to heat and pressurize the laminate 16. The intermediate resin layer forming step in which the laminate 16 is heated and pressurized can be performed using an autoclave having a container capable of heating and pressurizing.

[0036] <Effects of the manufacturing method of laminated glass 11> Next, the operation of the method for manufacturing the laminated glass 11 will be described. For example, when the laminate 16 obtained in the laminate formation step is transported to the next step, the first resin film F1 and the second resin film F2 move relatively in directions away from each other. Such relative movement will be described by taking as an example a case where a position change step is performed to change the laminate 16 from the horizontal position shown in Fig. 11 to the vertical position shown in Fig. 12(a).

[0037] In the horizontally oriented laminate 16, the weight of the upper glass plate 12 acts on the first resin film F1 and the second resin film F2, applying a force that sandwiches the first resin film F1 and the second resin film F2 between the pair of glass plates 12. In the laminate 16 whose orientation has been changed to the vertical orientation in the orientation change step, the force sandwiching the first resin film F1 and the second resin film F2 as described above is alleviated. As a result, the first resin film F1 and the second resin film F2 move relatively in directions that separate them from each other, as shown in FIG. 12(b).

[0038] For example, in the laminate formation step, the first resin film F1 and the second resin film F2 are arranged between the pair of glass plates 12 in a state in which they are pulled along the main surfaces of the pair of glass plates 12. When the force sandwiching the first resin film F1 and the second resin film F2 as described above is relaxed, the first resin film F1 and the second resin film F2 shrink. As the first resin film F1 and the second resin film F2 shrink in this manner, the first resin film F1 and the second resin film F2 move relatively in directions separating them from each other.

[0039] At this time, since the intermediate film layer 17 of the laminate 16 of this embodiment has the above-mentioned overlapping portion 17a, the gap dimension between the first resin film and the second resin film F2 can be kept small.

[0040] Even if the above-mentioned position changing step is not performed, the above-mentioned relative movement between the first resin film F1 and the second resin film F2 can occur due to vibrations and the like when the laminate 16 is transported to the next step.

[0041] Next, a degassing process is performed to expel the gas between the pair of glass plates 12, and as shown in Figure 12(c), a discontinuous portion 17b is formed in the intermediate film layer 17 of the laminate 16, where the end face of the first resin film F1 faces the end face of the second resin film F2.

[0042] FIG. 13 shows a modified example in which overlapping portions 17a of intermediate film layer 17 are provided so as to overlap the outer peripheral edges of a pair of glass plates 12 when laminated body 16 is viewed in plan. Here, for example, before performing a degassing process to remove gas from between the pair of glass plates 12 in the laminate 16, a confirmation test may be performed to check whether the sealing member 18 is properly attached by evacuating the inside of the sealing member 18. When a confirmation test is performed on the laminate 16 shown in FIG. 13, a force is applied in a direction that moves the pair of glass plates 12 closer together due to the removal of gas from between the pair of glass plates 12. At this time, as shown in FIG. 14, bending stress is generated at the outer peripheral edges of the pair of glass plates 12 due to the overlapping portion 17a. When such bending stress is generated at the outer peripheral edges of the glass plates 12, cracks that existed at the outer peripheral edges of the glass plates 12 may grow, causing the glass plates 12 to break.

[0043] In this embodiment, as shown in Fig. 7, the overlapping portion 17a of the intermediate film layer 17 in the laminate 16 is located inside the outer peripheral edges of the pair of glass sheets 12 in a plan view of the laminate 16. Therefore, even if a force is applied in a direction that brings the pair of glass sheets 12 closer together as described above, unnecessary bending stress caused by the overlapping portion 17a between the first resin film F1 and the second resin film F2 is unlikely to occur at the outer peripheral edges of the glass sheets 12. This makes it possible to prevent cracks from occurring in the glass sheets 12.

[0044] 7 and 9, the intermediate film layer 17 of the laminate 16 has a discontinuous portion 17b that extends from the outer peripheral edge of the intermediate film layer 17 toward the inside of the intermediate film layer 17 in a planar view. Although not shown, the first resin film F1 and the second resin film F2 move relative to each other, thereby forming the discontinuous portion 17b so as to traverse the intermediate film layer 17 in a planar view of the laminate 16, for example.

[0045] In the intermediate resin layer forming process, gas between the pair of glass sheets 12 can be discharged from the outer peripheral edge of the intermediate film layer 17 through the discontinuous portions 17b of the intermediate film layer 17 in the laminate 16. In this way, in the intermediate resin layer forming process, the discontinuous portions 17b of the intermediate film layer 17 serve as degassing paths for degassing between the pair of glass sheets 12, thereby enabling smooth degassing between the pair of glass sheets 12. Furthermore, in the intermediate resin layer forming process, the discontinuous portions 17b can be fused to form the low-adhesion portions 15 of the intermediate resin layer 13 in the laminated glass 11.

[0046] Next, the operation and effects of this embodiment will be described. (1) Laminated glass 11 has a laminated structure of a pair of glass plates 12 and an intermediate resin layer 13 provided between the pair of glass plates 12. The manufacturing method of laminated glass 11 includes a laminate-forming step and an intermediate resin layer-forming step. In the laminate-forming step, a laminate 16 is formed having a laminated structure of a pair of glass plates 12 and an intermediate film layer 17 in which a resin film F is disposed between the pair of glass plates 12. In the intermediate resin layer-forming step, the laminate 16 is heated to bond the intermediate film layer 17 to the pair of glass plates 12, thereby forming the intermediate resin layer 13. The resin film F has a first resin film F1 and a second resin film F2 that is disposed adjacent to the first resin film F1 and can be welded to the first resin film F1. The intermediate film layer 17 of the laminate 16 has an overlapping portion 17a where a portion of the first resin film F1 and a portion of the second resin film F2 overlap.

[0047] When the laminate 16 obtained in the laminate formation process is transported to the next process, for example, the first resin film F1 and the second resin film F2 move relative to each other in directions separating them. Since the intermediate film layer 17 of the laminate 16 has the overlapping portion 17a, the gap between the first resin film F1 and the second resin film F2 can be kept small. Therefore, the formation of bubbles in the intermediate resin layer 13 can be suppressed.

[0048] (2) In the method for manufacturing the laminated glass 11, the overlapping portion 17a of the laminate 16 is located inside the outer peripheral edges of the pair of glass sheets 12 in a plan view of the laminate 16. Therefore, even if a force is applied in a direction that brings the pair of glass sheets 12 closer together, unnecessary bending stress caused by the overlapping portion 17a between the first resin film F1 and the second resin film F2 is unlikely to occur at the outer peripheral edges of the glass sheets 12. This makes it possible to prevent cracks from occurring in the glass sheets 12.

[0049] (3) The overlapping portions 17a of the laminate 16 are preferably located at a position 10 mm or more away from the outer peripheral edges of the pair of glass sheets 12 in a plan view of the laminate 16. In this case, the generation of the above-mentioned unnecessary bending stress at the outer peripheral edges of the glass sheets 12 can be further suppressed. This further suppresses the occurrence of cracks in the glass sheets 12.

[0050] (4) The outer peripheral edge of the first resin film F1 and the outer peripheral edge of the second resin film F2 of the laminate 16 are spaced apart at a position along the outer peripheral edges of the pair of glass sheets 12. In this case, it is possible to further prevent the above-mentioned unnecessary bending stress from occurring at the outer peripheral edges of the glass sheets 12. This further prevents the glass sheets 12 from cracking.

[0051] (5) The laminate formation step is a step of placing a resin film F between a pair of horizontally oriented glass sheets 12 to obtain a laminate 16. The method for producing laminated glass 11 may further include a position change step of changing the position of the laminate 16 to a vertical position between the laminate formation step and the intermediate resin layer formation step. In such a position change step, the force sandwiching the first resin film F1 and the second resin film F2 between the pair of glass sheets 12 is likely to be reduced, and the amount of relative movement between the first resin film F1 and the second resin film F2 is likely to be large. For this reason, a laminate 16 having the above-described overlapping portion 17a is particularly advantageous.

[0052] (6) The pair of glass sheets 12 may have sides of 1000 mm or more. When the dimensions of the pair of glass sheets 12 are relatively large, it may be difficult to obtain a single resin film that fits the dimensions. The manufacturing method for the laminated glass 11 described above uses multiple resin films, so that an intermediate film layer 17 with a relatively large dimension can be formed from resin films of existing dimensions.

[0053] (Example of change) This embodiment can be modified as follows: This embodiment and the following modifications can be combined and implemented within the scope of technical compatibility.

[0054] The intermediate resin layer 13 of the laminated glass 11 has a resin substrate layer L1 and an adhesive layer L2, but the adhesive layer L2 may be omitted and the intermediate resin layer 13 may be composed of only the resin substrate layer L1. The first low adhesive portion 15a and the second low adhesive portion 15b in the intermediate resin layer 13 of the laminated glass 11 may be separated from each other and not connected to each other.

[0055] The first low adhesion portion 15a and the second low adhesion portion 15b in the intermediate resin layer 13 of the laminated glass 11 are connected in the center of the intermediate resin layer 13 in a plan view, but may be connected closer to the periphery than the center.

[0056] The first low adhesive portion 15a and the second low adhesive portion 15b in the intermediate resin layer 13 of the laminated glass 11 may have a linear or curved shape. The planar shape of the laminated glass 11 may be any polygonal shape other than a square, or may be, for example, a circle, an oval, or the like.

[0057] The number of resin films F constituting the intermediate film layer 17 of the laminate 16 may be three or more. In this case, it is sufficient that the overlapping portion 17a is formed by at least two adjacent resin films.

[0058] 7, the shape of the first edge E1 of the first resin film F1 and the shape of the second edge E2 of the second resin film F2 may be the same. Furthermore, for example, the shape of the second edge E2 of the second resin film F2 is curved, but it may also be, for example, bent.

[0059] 7, the overlapping portions 17a may be formed over the entire first edge E1 of the first resin film F1 and the entire second edge E2 of the second resin film F2. Alternatively, the overlapping portions 17a may be formed so as to be scattered along the first edge E1 of the first resin film F1 and the second edge E2 of the second resin film F2.

[0060] FIG. 15 shows a modified example in which the overlapping portion 17a of the intermediate film layer 17 overlaps the outer peripheral edges of a pair of glass sheets 12 in a plan view of the laminate 16. In this modified example, the thickness of the first resin film F1 and the second resin film F2 at the overlapping portion 17a of the intermediate film layer 17 is smaller than the thickness of the other portions. This prevents the overlapping portion 17a of the intermediate film layer 17 from becoming locally thick. In this case, unnecessary bending stress caused by the overlapping portion 17a of the first resin film F1 and the second resin film F2 is less likely to occur at the outer peripheral edges of the glass sheets 12. This prevents cracks from occurring in the glass sheets 12. One method for partially reducing the thickness of the first resin film F1 and the second resin film F2 is, for example, pressing a portion of the resin film F. The pressing may be a heat pressing process in which the resin film F is heated. The thickness of either the first resin film F1 or the second resin film F2 may be partially reduced to form the overlapping portion 17a. Even in this case, the occurrence of cracks in the glass plate 12 can be suppressed.

[0061] The laminate formation step in the manufacturing method of the laminated glass 11 may be a step of obtaining the laminate 16 by placing the resin film F between a pair of glass plates 12 in a vertical position. In the method for manufacturing the laminated glass 11, the position changing step can be omitted.

[0062] The laminated glass 11 is not limited to a three-layer structure consisting of a pair of glass sheets 12 and an intermediate resin layer 13. For example, it may have a five-layer structure consisting of a first glass sheet, a first intermediate resin layer, a second glass sheet, a second intermediate resin layer, and a third glass sheet. In this case, the laminated structure of the above embodiment may be applied to the first laminated structure consisting of the first glass sheet, the first intermediate resin layer, and the second glass sheet in the five-layer structure, or to the second laminated structure consisting of the second glass sheet, the second intermediate resin layer, and the third glass sheet. The laminated structure of the above embodiment may also be applied to both the first laminated structure and the second laminated structure in the five-layer structure. The laminated glass 11 may have a seven-layer or more structure, including an intermediate resin layer and glass sheets. [Explanation of symbols]

[0063] 11...Laminated glass 12...Glass plate 13...Intermediate resin layer 16...Laminate 17...Intermediate film layer 17a...Overlapping part D1a,D2…distance F: Resin film F1: First resin film F2: Second resin film

Claims

1. A method for manufacturing laminated glass having a laminated structure of a pair of glass plates and an intermediate resin layer provided between the pair of glass plates, a laminate forming step of forming a laminate having a laminate structure including the pair of glass plates and an intermediate film layer in which a resin film is disposed between the pair of glass plates; an intermediate resin layer forming step of heating the laminate to bond the intermediate film layer and the pair of glass plates to form the intermediate resin layer; The resin film includes a first resin film and a second resin film disposed adjacent to the first resin film, the first resin film has a first edge and the second resin film has a second edge; a shape of the second edge in a plan view includes at least one of a curved shape that is convex toward the first resin film side and a bent shape that is convex toward the first resin film side, a first resin film having a first edge and a second edge of the second resin film overlapping each other;

2. A method for manufacturing laminated glass as described in claim 1, wherein the planar shape of the first edge includes at least one of a straight shape, a curved shape that is convex toward the second resin film side, and a bent shape that is convex toward the second resin film side.

3. 3. The method for manufacturing laminated glass according to claim 1, wherein the overlapping portion is provided on the inside of outer peripheral edges of the pair of glass plates in a plan view of the laminate.

4. The method for manufacturing laminated glass according to claim 3 , wherein the overlapping portions are provided at positions spaced apart by 10 mm or more from outer peripheral edges of the pair of glass plates in a plan view of the laminate.

5. 5. The method for manufacturing laminated glass according to claim 1, wherein an outer peripheral edge of the first resin film and an outer peripheral edge of the second resin film of the laminate are spaced apart at positions along the outer peripheral edges of the pair of glass plates.

6. 6. The method for manufacturing laminated glass according to claim 5, wherein a distance between an outer peripheral edge of the first resin film and an outer peripheral edge of the second resin film at a position along the outer peripheral edges of the pair of glass plates is 1 mm or more.

7. the laminate formation step is a step of arranging the resin film between the pair of glass plates in a horizontal orientation to obtain the laminate, The method for manufacturing laminated glass according to claim 1 , further comprising a position changing step of changing the position of the laminate to a vertical position between the laminate forming step and the intermediate resin layer forming step.

8. The method for manufacturing laminated glass according to claim 1 , wherein the pair of glass plates has a side of 1000 mm or more.

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