Manufacturing method for laminated glass and sealing member

Abstract

To provide a method of manufacturing a laminate glass by vacuum drawing by fitting a seal member in a periphery of a laminate, at the same time as applying heating and pressurizing, to a laminate in which a resin made intermediate film is interposed between a plurality of flat glasses, to manufacture a laminate glass, the method of manufacturing a laminate glass capable of manufacturing a high-quality laminate glass by preventing foaming remaining between the resin made intermediate film and the flat glass; and a seal member.SOLUTION: A sealing member includes a base that abuts on an end face of a glass laminate, and a pair of supporting portions that protrude from a contact surface of the base and are arranged to face in a thickness direction of the glass laminate, in which the base has a depression passage along an edge surface of the glass laminate, the supporting portion has a holding portion provided in the middle in the projecting direction and a lip portion provided at the end of the supporting portion, and the holding portion has a first space portion located on the base side and a communicating passage communicating with a second space portion located on the lip portion side.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a method for manufacturing laminated glass and a sealing member used in the manufacturing method. [Background technology]

[0002] BACKGROUND ART Laminated glass has been known as glass having excellent penetration resistance, impact resistance, and the like. The above-mentioned laminated glass is generally produced by an ACV (autoclave) method comprising a lamination step, a temporary pressure bonding step, a main pressure bonding step, and the like, which are carried out in sequence over time. Specifically, laminated glass is produced by laminating at least two glass sheets with a resin interlayer interposed therebetween to form a glass laminate (lamination process), heating the formed glass laminate to soften the resin interlayer, pre-pressing the glass sheets together (pre-pressing process), and then heating and pressurizing the pre-pressed glass sheets in an autoclave (main pressing process).

[0003] In the above-described main pressure-bonding step, for example, in order to prevent air bubbles or the like remaining between the resin interlayer and the glass sheet, which could lead to quality defects such as peeling of the glass sheet (or the resin interlayer) or poor appearance of the produced laminated glass, or to improve the adhesion between the resin interlayer and the glass sheet, the autoclave furnace is pressurized and simultaneously a vacuum treatment is performed on the lamination interface of the glass laminate placed in the furnace. As an example of a technique for performing such a vacuuming process, Patent Document 1, for example, discloses a technique for a vacuuming process using a frame-shaped sealing member that is fitted to the peripheral portion of a formed laminate (glass laminate). [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2016-210654 Summary of the Invention [Problem to be solved by the invention]

[0005] The sealing member in Patent Document 1 includes, in a cross-sectional view seen in the extending direction of the end face of the glass laminate, a base that abuts the end face, and a pair of support parts that extend from the base towards the inner periphery of the sealing member and are arranged opposite each other in the thickness direction of the glass laminate. The base portion has a decompression passage formed therein that extends along the edge surface of the glass laminate. In addition, a folded portion (lip portion) is formed at the tip portion (the end portion opposite the base side) of each support portion, bending in a "L" shape toward the inside (the opposite side of each support portion). Furthermore, a protruding portion (sandwiching portion) that protrudes inward (toward the opposing side of each support portion) is formed at the midpoint of each support portion (between the base portion and the lip portion).

[0006] The sealing member is fitted into the peripheral edge of the glass laminate with its base abutting against the end face of the glass laminate, its pair of protrusions clamping the glass laminate in the thickness direction, and its pair of lip portions in contact with the outermost glass plate. This results in a decompression passage being arranged along the lamination interface of the glass laminate, and by performing a vacuum process through this decompression passage, the air inside the sealing member (the space surrounded by the peripheral edge of the glass laminate and the sealing member) is also sucked in, creating a vacuum inside, and the pair of lip portions are firmly adhered to the outermost glass plate. Therefore, when a vacuum process is performed on the lamination interface of the glass laminate through the decompression passage, the inside of the sealing member is sealed by the pair of lip portions, preventing air from the outside (around the glass laminate) from flowing into the inside and leaving air bubbles between the resin interlayer and the glass plate.

[0007] However, as described above, since a pair of protrusions are present inside the sealing member, when the air inside the sealing member is sucked through the decompression passage, depending on the thickness of the glass laminate and the properties (viscosity, etc.) of the resin interlayer, it is relatively easy to suck the air inside and reach a predetermined vacuum state in the first space portion located near the decompression passage (the space portion inside the sealing member on the base side of the protrusions), but in the second space portion (the space portion inside the sealing member on the lip side of the protrusions), which is located farther away from the decompression passage than the first space portion, the clamping portion acts as an obstacle, making it difficult to suck the air inside and making it difficult to fully reach the predetermined vacuum state. As a result, the pair of lip portions could not be sufficiently adhered to the outermost glass sheet, and external air flowed into the sealing member, leaving air bubbles between the resin interlayer and the glass sheet, which could cause poor quality of the laminated glass produced.

[0008] The present invention has been made in consideration of the current problems described above, and has an object to provide a method for manufacturing laminated glass, in which a laminate formed by laminating at least two glass sheets with a resin interlayer between them is subjected to a heat and pressure treatment in an autoclave, and at the same time, a sealing member having a frame shape that conforms to the outer shape of the laminate is fitted around the periphery of the laminate, and a vacuum treatment is performed to press the glass sheets together to produce laminated glass, as well as a sealing member for use in the manufacturing method, which prevents air bubbles and the like from remaining between the resin interlayer and the glass sheets, making it possible to produce high-quality laminated glass. [Means for solving the problem]

[0009] The problem to be solved by the present invention is as described above, and the means for solving this problem will now be described.

[0010] That is, the method for manufacturing laminated glass according to the present invention is a method for manufacturing laminated glass, in which a laminate formed by laminating at least two glass sheets with a resin interlayer interposed therebetween is subjected to a heating and pressurizing treatment in an autoclave, and at the same time, a sealing member having a frame shape that conforms to the outer shape of the laminate is fitted around the peripheral edge of the laminate, and a vacuum treatment is performed to press the glass sheets together to manufacture laminated glass, wherein the sealing member, when fitted around the peripheral edge of the laminate, has a base that abuts against an end face of the laminate and extends along the end face, and a sealing member that extends along the base and protrudes from a surface of the base that abuts against the end face toward the inner periphery of the sealing member and is spaced a predetermined distance apart in the thickness direction of the laminate. and a pair of support parts arranged opposite each other with a gap therebetween, the base part having a decompression passage extending along the end face of the stack, the support parts having a clamping part extending along the base part at a midpoint in the protruding direction of the support parts and clamping the stack in the thickness direction, and a lip part extending along the base part at an end of the support parts in the protruding direction and capable of coming into close contact with the plate surface of the outer glass sheet which is the glass sheet located on the outermost layer side of the stack, the clamping part having a communication passage communicating between a first space part located on the base side of the clamping part and a second space part located on the lip side of the clamping part in a space surrounded by the abutment surface of the base, the inner surface of the support parts, and the plate surface of the outer glass sheet. Furthermore, the sealing member according to the present invention has a frame shape that follows the outer shape of a laminate formed by laminating at least two glass sheets with a resin interlayer interposed therebetween, and is fitted to the peripheral edge of the laminate to perform a vacuuming process. The sealing member comprises: a base that, when fitted to the peripheral edge of the laminate, contacts an end face of the laminate and extends along the end face; and a pair of support parts that extend along the base, protrude from the contact surface of the base with the end face toward the inner periphery of the sealing member, and are arranged opposite each other at a predetermined interval in the thickness direction of the laminate, and the base parts extend along the end face of the laminate. The laminated body has a pressure reducing passage, and the support portion has a clamping portion that extends along the base portion at a midpoint in the protruding direction of the support portion and clamps the laminated body in the thickness direction, and a lip portion that extends along the base portion at an end of the support portion in the protruding direction and can be in close contact with the plate surface of the outer glass sheet, which is the glass sheet located on the outermost layer side of the laminated body, and the clamping portion has a communication passage that communicates between a first space portion located on the base side of the clamping portion and a second space portion located on the lip side of the clamping portion in a space surrounded by the abutment surface of the base, the inner surface of the support portion, and the plate surface of the outer glass sheet. With this configuration, the method for manufacturing laminated glass and the sealing member according to the present invention can reliably suck air from inside the second space portion through the communication passage when sucking air from inside the sealing member through the decompression passage, thereby achieving a predetermined vacuum state. Therefore, the lip portion can be made to adhere sufficiently tightly to the surface of the outer glass sheet in the laminate, thereby maintaining a sealed state inside the sealing member, and it is possible to reliably prevent outside air from flowing into the sealing member during pressure treatment. As a result, no air bubbles or the like remain between the resin interlayer film and the glass sheets in the produced laminated glass, and the quality of the laminated glass can be improved. Furthermore, in the method for manufacturing laminated glass and the sealing member according to the present invention, the means for connecting the first space and the second space does not involve removing the clamping portion itself, which could be an obstacle, but rather provides a communication passage in part of the clamping portion and leaves the clamping portion in other areas. This prevents an extreme decrease in the rigidity of the sealing member and does not reduce workability when fitting the sealing member around the periphery of the laminate.

[0011] In the method for producing laminated glass and the sealing member according to the present invention, it is preferable that a plurality of the communication passages are provided. With this configuration, the method for manufacturing laminated glass and the sealing member according to the present invention can more efficiently and reliably suck air from inside the second space portion via the multiple communication passages when sucking air from inside the sealing member via the decompression passage, thereby making it possible to achieve a predetermined vacuum state in the second space.

[0012] In the method for manufacturing laminated glass and the sealing member according to the present invention, the communication passages are preferably provided around the entire circumference of the sealing member and are arranged at equal intervals along the extending direction of the clamping portion. With this configuration, the method for manufacturing laminated glass and the sealing member according to the present invention can aspirate the air inside the sealing member through the decompression passage and perform a vacuum process on the laminate. Even if, for example, the air inside the second space portion cannot be sufficiently aspirated in any region around the entire circumference of the sealing member, resulting in poor evacuation, the air inside the second space portion can be reliably aspirated in other regions, and the second space of the sealing member as a whole can reach a predetermined vacuum state.

[0013] In the method for manufacturing laminated glass and the sealing member according to the present invention, the communication passage is preferably provided at least in a corner of the sealing member. With this configuration, the method for manufacturing laminated glass and the sealing member according to the present invention can reliably suck air from inside the second space, even at the corners of the sealing member, which are prone to causing poor evacuation, and can bring the second space to a predetermined vacuum state.

[0014] In the method for manufacturing laminated glass and the sealing member according to the present invention, it is preferable that the sealing member has a connection point that connects the evacuation means that performs the evacuation process to the decompression passage and communicates between the evacuation means and the decompression passage, and that the communication passage is provided at least at a position that is farthest from the connection point. According to the method for manufacturing laminated glass and the sealing member of the present invention, it is possible to reliably suck air from inside the second space portion even at the position in the sealing member that is furthest from such a connection point, and to make the second space reach a predetermined vacuum state. [Effects of the Invention]

[0015] The present invention has the following effects. That is, the method for producing laminated glass according to the present invention and the sealing member used in the method for producing laminated glass can prevent air bubbles and the like from remaining between the resin interlayer film and the glass sheets, making it possible to produce high-quality laminated glass. [Brief explanation of the drawings]

[0016] [Figure 1] 1 is a partial cross-sectional front view showing the overall configuration of a sealing member according to an embodiment of the present invention; [Figure 2] 2 is an enlarged cross-sectional view of the sealing member as seen in the direction of arrow A in FIG. 1, showing the cross-sectional shape of the sealing member. FIG. [Figure 3] 2 is a diagram showing the configuration of a portion of the sealing member where a communication passage is provided, and is an enlarged partial cross-sectional front view of a portion indicated by region B in FIG. 1. FIG. [Figure 4] 2 is a diagram showing the configuration of a portion of the sealing member where a communication passage is provided, and is an enlarged partial cross-sectional front view of a portion indicated by region C in FIG. 1. FIG. [Figure 5] FIG. 2 is a perspective view showing the configuration of a vertically placed jig for holding a laminate and an autoclave. DETAILED DESCRIPTION OF THE INVENTION

[0017] Next, an embodiment of the present invention will be described with reference to FIGS. For the sake of convenience, in the following description, the up-down direction in FIGS. 1 to 4 will be defined as the up-down direction of the sealing member 1.

[0018] [Laminated glass manufacturing method] First, an embodiment of a method for producing laminated glass according to the present invention will be described with reference to FIGS. 1, 2, and 5. FIG. In FIG. 2, the method for producing laminated glass in this embodiment is a method for producing laminated glass 50 by the ACV method (autoclave method), in which a heat and pressure treatment is performed in an autoclave 100 (see FIG. 5), and at the same time, a vacuum treatment is performed using a sealing member 1 fitted around the periphery of glass laminate 50A, thereby making it possible to produce high-quality laminated glass 50.

[0019] Here, the laminated glass 50 is composed of a glass laminate 50A consisting of a resin interlayer 51 and at least two (two in this embodiment) glass sheets 52, 52 stacked with the resin interlayer 51 interposed therebetween. The glass laminate 50A is an example of a laminate according to the present invention.

[0020] The resin intermediate film 51 is formed from a thermoplastic resin such as a fluororesin that has excellent heat resistance and flame resistance. The material of the resin intermediate film 51 is not limited to that in this embodiment, and may be, for example, a thermoplastic resin such as PVB (polyvinyl butyral) or a thermosetting resin such as EVA (ethylene vinyl acetate).

[0021] The laminated glass 50 is manufactured through a manufacturing process including a laminating step S01, a temporary pressure-bonding step S02, and a main pressure-bonding step S03, which are carried out in order over time. Specifically, in a lamination step S01, two (a pair of) glass sheets 52 are laminated with a resin interlayer 51 interposed therebetween to form a glass laminate 50A. Subsequently, in a pre-press-bonding step S02, the formed glass laminates 50A are all placed in an autoclave 100, and each glass laminate 50A is heated and pressurized at a predetermined first temperature and a first pressure to soften the resin interlayer 51 and pre-press-bond the glass sheets 52. Then, in a main-pressing step S03, the pre-press-bonded pair of glass sheets 52 are further heated and pressurized at a second temperature that is higher than the first temperature and a second pressure that is higher than the first pressure, thereby pressing (thermo-press-bonding) the glass sheets 52 of each glass laminate 50A together to produce a laminated glass 50.

[0022] Here, a sealing member 1 for maintaining the laminated state of each glass laminate 50A formed in the lamination step S01 is fitted to the peripheral portion of each glass laminate 50A, and the heat and pressure treatment in the main pressure bonding step S03 is performed using the sealing member 1, while a vacuum is drawn to the peripheral portion of each glass laminate 50A (more specifically, the lamination interfaces 53-53 of the glass laminate 50A).

[0023] The sealing member 1, which will be described in detail later, is a frame-shaped member that is roughly U-shaped in cross section and has an opening on the inner periphery.When the sealing member 1 is fitted along the peripheral edges of a pair of glass sheets 52 / 52 through the opening, the boundary between the pair of glass sheets 52 / 52 and the resin intermediate film 51 (lamination interface 53 / 53) is connected to a pressure reduction passage 11b consisting of a pair of grooves 11b1 / 11b1.

[0024] As shown in FIG. 1, when the sealing member 1 is fitted into the glass laminate 50A, the pressure reduction passage 11b (shown in FIG. 1 as a virtual cross section parallel to the extension direction of the base 11, and therefore only one groove portion 11b1 is shown) provided in the sealing member 1 is connected to a vacuum pump 22 or the like via a piping member 21. As a result, lamination interfaces 53, 53 (see FIG. 2) of the glass laminate 50A are connected to the vacuum pump 22 via the decompression passage 11b and the piping member .

[0025] A plurality of glass laminates 50A, 50A, each having a vacuum pump 22 connected to a sealing member 1, are held together in a vertical position, for example, by a vertical jig 101, as shown in Figure 5, and are placed into the furnace of an autoclave 100.

[0026] Thereafter, a preliminary pressure-bonding step S02 is carried out in the furnace of the autoclave 100, followed by a main pressure-bonding step S03 in which heating and pressure treatment is carried out, and at the same time, a vacuum pump 22 is used to draw a vacuum at the lamination interfaces 53-53 between the pair of glass sheets 52-52 and the resin interlayer 51, so that the glass sheets 52-52 of each glass laminate 50A are thermally pressure-bonded to each other.

[0027] Then, after the main pressure bonding process S03 is completed and it is confirmed that the temperature inside the autoclave 100 has dropped below a predetermined temperature, the multiple glass laminates 50A·50A··· are removed from the furnace together with the vertical jig 101, and the evacuation process by the vacuum pump 22 is stopped. Thus, the manufacturing process of the laminated glass is completed, and a plurality of completed laminated glasses 50·50··· are obtained simultaneously.

[0028] [Sealing member 1] Next, an embodiment of a sealing member 1 according to the present invention will be described in detail with reference to FIGS.

[0029] As shown in FIG. 2, the sealing member 1 is fitted to the peripheral portion of a glass laminate 50A, which is formed by laminating a pair of glass sheets 52, 52 with a resin interlayer 51 interposed therebetween, to seal the peripheral portion and maintain the laminated state of the glass laminate 50A.

[0030] The sealing member 1 is made of a heat-resistant elastic material such as fluororubber, silicone rubber, or acrylic rubber. The sealing member 1 is configured in a frame shape that conforms to the outer shape of the glass laminate 50A (more specifically, a pair of glass plates 52·52), and in this embodiment, for example, as shown in FIG. 1, is configured in a rectangular frame shape.

[0031] The shape of the sealing member 1 is not limited to that of this embodiment, and may be a frame shape, such as a circular shape or a polygonal shape other than a rectangular shape, as long as it follows the outer shape of the glass laminate 50A.

[0032] The sealing member 1 is configured to have a substantially U-shaped cross section that opens to the inner periphery side of the frame shape. Specifically, as shown in Figure 2, when the sealing member 1 is fitted to the peripheral portion of the glass laminate 50A, it abuts against the end face of the glass laminate 50A (more specifically, the end faces 52a-52a of a pair of glass plates 52-52) and extends along the end faces 52a-52a, and has a pair of support portions 12-12 that protrude from the abutting surface 11a of the base 11 with the end face of the glass laminate 50A to the inner side of the sealing member 11 (the inner side of the frame shape, the lower side in Figure 2), extend along the base 11, and are arranged opposite each other with a predetermined gap in the thickness direction of the glass laminate 50A.

[0033] The base 11 has a decompression passage 11b extending along the edge surface of the glass laminate 50A. The decompression passage 11b is made up of a pair of grooves 11b1 formed in a generally semicircular shape in cross section, for example, and is disposed opposite the end faces 52a of the pair of glass plates 52, respectively.

[0034] The pair of grooves 11b1-11b1 form a rib 11c having a generally rectangular cross section at the center of the contact surface 11a of the base 11 in the thickness direction, extending along the edge surface of the glass laminate 50A.

[0035] The rib portion 11c has a contact surface 11c1 that straddles the resin interlayer 51 and can come into contact with end faces 52a of a pair of glass sheets 52 with the resin interlayer 51 interposed therebetween. The abutment surface 11c1 is formed so as to be positioned on approximately the same plane as the abutment surface 11a of the base 11, and the rib portion 11c abuts against the end faces 52a / 52a of a pair of glass plates 52 / 52 via the abutment surface 11c1, thereby blocking the resin intermediate film 51 interposed between the pair of glass plates 52 / 52.

[0036] When the rib portion 11c abuts against the end faces 52a / 52a of a pair of glass sheets 52 / 52 via the abutment surface 11c1, there is a small gap (not shown) between the abutment surface 11c1 and the end faces 52a, which is caused, for example, by a manufacturing error of the rib portion 11c within the allowable range or by the surface roughness of the abutment surface 11c1 and the end faces 52a, and this gap allows only gas to pass through without allowing the resin intermediate film 51 to flow out.

[0037] When the sealing member 1 is fitted around the peripheral edge of the glass laminate 50A, the rib portion 11c abuts against the ends 52a of the pair of glass sheets 52, 52, and seals the resin interlayer 51 interposed between the pair of glass sheets 52. In this state, the pressure reduction passage 11b is connected to the lamination interface 53 / 53 existing between the pair of glass sheets 52 / 52 and the resin interlayer 51 through a small gap formed between the abutment surface 11c1 of the rib portion 11c and the end surface 52a of the glass sheet 52.

[0038] Furthermore, when the sealing member 1 is fitted around the peripheral edge of the glass laminate 50A, the abutment surface 11c1 of the rib portion 11c and the abutment surface 11a of the base portion 11 abut against the end faces 52a / 52a of the pair of glass plates 52 / 52, thereby restricting positional misalignment of the pair of glass plates 52 / 52 in the plate surface direction (direction perpendicular to the thickness direction).

[0039] Even when the base 11 abuts against the end faces 52a / 52a of a pair of glass plates 52 / 52 via the abutment surface 11a, as in the case of the rib portion 11c described above, there is a small gap (not shown) between the abutment surface 11a and the end faces 52a, which is caused, for example, by a manufacturing error of the base 11 within the allowable range or by the surface roughness of the abutment surface 11a and the end faces 52a, and this gap allows only gas to pass through without allowing the resin intermediate film 51 to flow out.

[0040] Therefore, when the sealing member 1 is fitted to the peripheral portion of the glass laminate 50A, the decompression passage 11b communicates with the space (more specifically, the first space 13 described later) between the plate surface (flat surface at the peripheral portion) of the glass sheet 52 and the inner surface (opposing surface) of the support portion 12 through a small gap that occurs between the abutment surface 11a of the base 11 and the end surface 52a of the glass sheet 52.

[0041] On the other hand, in a pair of support portions 12, 12 arranged opposite each other, each support portion 12 has a clamping portion 12a located midway in the protruding direction of the support portion 12 (toward the inner periphery of the sealing member 1), and a lip portion 12b located at the end of the protruding direction of the support portion 12.

[0042] The clamping portions 12a are formed on the inner surfaces (opposing surfaces) of the support portions 12 so as to protrude toward the glass laminate 50A (opposing direction side) and extend along the base portion 11. Further, the protruding end surface 12a1 of the clamping portion 12a is formed in a planar shape that is perpendicular to the contact surface 11a of the base portion 11 and parallel to the extension direction of the support portion 12.

[0043] Furthermore, the distance between the pair of clamping portions 12a·12a (more specifically, the pair of protruding end faces 12a1·12a1) is set to be approximately the same as or slightly smaller than the thickness of the glass laminate 50A (dimension W in Figure 2).

[0044] When the sealing member 1 is fitted to the peripheral portion of the glass laminate 50A, the pair of protruding end faces 12a1·12a1 abut against the peripheral portions of the pair of glass plates 52·52, so that the pair of clamping portions 12a·12a clamps the peripheral portions of the pair of glass plates 52·52. As a result, the glass laminate 50A is clamped in the thickness direction by the pair of clamping portions 12a, 12a, and positional deviation of the pair of glass sheets 52 in the thickness direction is restricted.

[0045] Even when the protruding end faces 12a1 of the pair of clamping portions 12a are in contact with the peripheral edges of the pair of glass sheets 52, as in the case of the rib portion 11c described above, there is a small gap (not shown) between the protruding end face 12a1 of each clamping portion 12a and the surface of each glass sheet 52, due to, for example, an allowable manufacturing error of the clamping portion 12a or the surface roughness of the protruding end face 12a1 and the glass sheet 52, and this gap allows only gas to pass through without allowing the resin interlayer 51 to leak out.

[0046] Therefore, when the sealing member 1 is fitted to the peripheral portion of the glass laminate 50A, the space between the plate surface of the glass sheet 52 and the inner surface (opposing surface) of the support portion 12 is substantially separated into a first space portion 13 located on the base portion 11 side relative to the clamping portion 12a, and a second space portion 14 located on the lip portion 12b side relative to the clamping portion 12a, but these first space portion 13 and second space portion 14 are connected via a small gap that occurs between the protruding end surface 12a1 of the clamping portion 12a and the plate surface of the glass sheet 52.

[0047] The lip portion 12b is formed at the tip of each support portion 12 (the end opposite the base portion 11) so as to bend in a "L" shape toward the inside (opposite side) of the support portion 12 and toward the base portion 11, and extend along the base portion 11.

[0048] The distance between the pair of lip portions 12b (more specifically, the tip portions 12b1 of the pair of lip portions 12b) is set to be sufficiently smaller than the thickness (dimension W) of the glass laminate 50A.

[0049] When the sealing member 1 is fitted to the peripheral portion of the glass laminate 50A, the peripheral portions of the pair of glass plates 52 / 52 are inserted into the gap between the pair of support portions 12 / 12 while sliding along the pair of lip portions 12b / 12b. As a result, when the sealing member 1 is fitted to the peripheral edge of the glass laminate 50A, the pair of lip portions 12b / 12b are tightly attached to the plate surfaces of the outer glass plates (in this embodiment, two (a pair) of glass plates 52 / 52), which are glass plates located on the outermost layer side of the glass laminate 50A, thereby sealing the decompression passage 11b formed in the base 11 from the outside of the sealing member 1, thereby increasing the airtightness of the decompression passage 11b and clamping the peripheral edges of the pair of glass plates 52 / 52.

[0050] In this way, the sealing member 1 in this embodiment is fitted along the peripheral portion of the glass laminate 50A, and thereby straddles (covers) the end face of the resin interlayer 51 and abuts against the end face of the glass laminate 50A via the abutment surface 11c1 of the rib portion 11c so as to seal the space between the glass sheets 52, 52 interposed by the resin interlayer 51, and clamps the peripheral portion of the glass laminate 50A via the protruding end faces 12a1, 12a1 of the pair of clamping portions 12a. Therefore, during the heating and pressurizing treatment in the above-mentioned main pressure bonding step S03, the resin interlayer 51 softens and flows into the decompression passage 11b, which prevents uneven thickness from occurring at the periphery of the laminated glass 50. As a result, the resin intermediate film 51 is prevented from blocking the inside of the decompression passage 11b, and the decompression passage 11b can stably perform the evacuation process.

[0051] In addition, the sealing member 1 in this embodiment has a cross-sectional shape (see the abutment surface 11a of the base 11, the abutment surface 11c1 of the rib portion 11c, and the protruding end surface 12a1 of the clamping portion 12a in the support portion 12) that can regulate distortion in the thickness direction of the glass plate 52 and positional misalignment in the plate surface direction (direction perpendicular to the thickness direction) at the peripheral portion of each glass plate 52. Therefore, by fitting the sealing member 1 around the periphery of the glass laminate 50A, the laminated position of the pair of glass sheets 52 is firmly maintained. Therefore, according to the sealing member 1 of this embodiment, there is no need to provide a separate jig or the like for maintaining the stacked position of the pair of glass sheets 52-52, and the sealing member 1 can be easily fitted to the glass laminate 50A without causing any misalignment of the pair of glass sheets 52-52 at the peripheral portion of the glass laminate 50A.

[0052] Furthermore, the sealing member 1 in this embodiment has a cross-sectional shape (see lip portion 12b of support portion 12) that can ensure airtightness inside the sealing member 1 (the space surrounded by the abutment surface 11a of the base 11, the inner surface (opposing surface) of the support portion 12, and the plate surface of the plate glass 12) by being fitted along the peripheral portion of the glass laminate 50A. Therefore, after the sealing member 1 is fitted to the peripheral portion of the glass laminate 50A, there is no need to seal the gap between the pair of glass plates 52 / 52 and the pair of support portions 12 / 12 using, for example, adhesive tape, and the peripheral portion of the glass laminate 50A (more specifically, the gap between the pair of glass plates 52 / 52) can be easily sealed. In particular, the sealing member 1 is formed with a lip portion 12b to ensure airtightness inside the sealing member 1, and in addition, the clamping portion 12a also has the function of ensuring airtightness of the inner peripheral portion, so that the sealing member 1 has a double sealing function, and the airtightness of the pressure reduction passage 11b can be more reliably ensured.

[0053] As described above, when the sealing member 1 is fitted around the peripheral edge of the glass laminate 50A, the pressure reduction passage 11b communicates with the first space 13 through a small gap between the abutment surface 11a of the base 11 and the end surface 52a of the glass sheet 52, and the first space 13 communicates with the second space 14 through a small gap between the protruding end surface 12a1 of the clamping portion 12a and the plate surface of the glass sheet 52.

[0054] Here, in the main pressure bonding step S03, when a vacuum process is performed on the lamination interfaces 53·53 of the glass laminate 50A using the sealing member 1, all of the air inside the sealing member 1 is sucked out only through the decompression passage 11b consisting of a pair of groove portions 11b1·11b1. At this time, depending on the thickness of the glass laminate 50A and the characteristics (viscosity, etc.) of the resin interlayer 51, it may be difficult to create the small gap described above between the protruding end surface 12a1 of the clamping portion 12a and the plate surface of the glass plate 52.

[0055] In such a case, in the first space 13 located near the decompression passage 11b, it is relatively easy to suck out the air inside and bring the interior of the first space 13 to a predetermined vacuum state, but in the second space 14 located further away from the decompression passage 11b than the first space 13, the clamping portion 12a becomes an obstacle, making it difficult to suck out the air inside and fully reach the predetermined vacuum state. As a result, there is a risk that it may be impossible to ensure airtightness inside the sealing member 1 by bringing the lip portion 12b into sufficient contact with the surface of each glass plate 52. There is also a risk that the lip 12b may not be able to clamp the peripheral edges of the pair of glass plates 52.

[0056] Therefore, in this embodiment, a communication passage 15 that connects the first space 13 and the second space 14 is provided on the protruding end surface 12a1 of the clamping portion 12a.This makes it possible to fully achieve a predetermined vacuum state inside the second space 14 without being affected by the thickness of the glass laminate 50A or the characteristics (viscosity, etc.) of the resin interlayer 51, as described above, and the lip portion 12b can be sufficiently brought into close contact with the plate surface of each glass sheet 52, thereby reliably ensuring airtightness inside the sealing member 1.

[0057] That is, according to the sealing member 1 of this embodiment, a communication passage 15 that connects the first space portion 13 and the second space portion 14 is provided in the clamping portion 12a, which could become an obstacle, so that when air inside the sealing member 1 is sucked through the decompression passage 11b, the air inside the second space portion 14 can be reliably sucked through the communication passage 15, and a predetermined vacuum state can be reached.

[0058] Therefore, the lip portion 12b can be sufficiently adhered to the plate surface of the glass plate 52 in the glass laminate 50A, thereby maintaining a sealed state inside the sealing member 1, and it is possible to reliably prevent outside air from flowing into the inside of the sealing member 1 during the pressure treatment in the main crimping process S03. As a result, in the manufactured laminated glass 50, no air bubbles or the like remain between the resin interlayer 51 and the glass sheets 52, and the quality of the laminated glass 50 can be improved.

[0059] Furthermore, in the sealing member 1 of this embodiment, as a means for connecting the first space portion 13 and the second space portion 14, rather than removing the clamping portion 12a itself, which could become an obstacle, a communication passage 15 is provided in part of the clamping portion 12a, and the clamping portion 12a is left in other areas. As a result, the rigidity of the sealing member 1 is not reduced extremely, and there is no reduction in workability when fitting the sealing member 1 to the peripheral portion of the glass laminate 50A.

[0060] As shown in FIG. 3, the communication passage 15 has a predetermined width X (for example, about 1 mm in this embodiment) and is groove-shaped extending in one direction (vertical direction in FIG. 3), and communicates with the first space 13 at one end (upper side in FIG. 3) and with the second space 14 at the other end (lower side in FIG. 3).

[0061] As shown in FIG. 1, the communication passages 15 are provided at a plurality of locations in one sealing member 1. Specifically, the communicating passages 15·15··· are formed in the clamping portions 12a·12a of a pair of support portions 12·12 that constitute each long side portion 1A·1A extending in the longitudinal direction of the sealing member 1. In addition, the communicating passages 15·15··· are each formed in the clamping portions 12a·12a of a pair of support portions 12·12 that constitute each short side portion 1B·1B of a pair of short side portions 1B·1B extending in the short direction (perpendicular to the longitudinal direction) of the sealing member 1. Furthermore, the communicating passages 15·15··· are each formed in the clamping portions 12a·12a of a pair of support portions 13·13 that constitute each corner portion 1C at four corner portions 1C·1C·1C·1C located at the corners of the sealing member 1.

[0062] The locations where the communication passage 15 is provided are not limited to the multiple locations described above, but may be provided in only one specific location, for example, in any of the long side portion 1A, the short side portion 1B, and the corner portion 1C. However, as in the present embodiment, by providing communicating passages 15·15·· at multiple locations in the sealing member 1, when vacuuming the lamination interfaces 53·53 of the glass laminate 50A using the sealing member 1 in the main crimping process S03, it is more preferable because the air inside the second space 14 (see Figure 2) can be more efficiently and reliably sucked out via the multiple communicating passages 15·15··, and the second space 14 can reach a predetermined vacuum state.

[0063] In each long side portion 1A of the sealing member 1, the multiple communicating passages 15·15··· are formed so as to be perpendicular to the extension direction of the clamping portion 12a (the extension direction of the base 11, which in this embodiment is the longitudinal direction), and are arranged parallel to and at equal intervals (interval La in Figure 1) along the extension direction. In addition, in each short side portion 1B of the sealing member 1, the multiple communicating passages 15·15··· are formed so as to be perpendicular to the extension direction of the clamping portion 12a (the extension direction of the base 11, which in this embodiment is the short side direction), and are arranged parallel to and at equal intervals (interval Lb in Figure 1) along the extension direction.

[0064] The spacing La between the plurality of communication passages 15·15··· in each long side portion 1A and the spacing Lb between the plurality of communication passages 15·15··· in each short side portion 1B are appropriately set depending on the dimensions of the long side portion 1A and the short side portion 1B in the extension direction, the number of communication passages 15·15···, etc., and may be approximately the same (La=Lb) or may be different (La>Lb or La <Lb)。

[0065] As described above, in this embodiment, a plurality of communicating passages 15·15··· are provided around the entire circumference of the sealing member 1, and these communicating passages 15·15··· are each arranged at equal intervals along the extension direction of the pair of clamping portions 12a·12a in each long side portion 1A and the extension direction of the pair of clamping portions 12a·12a in each short side portion 1B.

[0066] With this configuration, when vacuuming is performed on the lamination interfaces 53·53 of the glass laminate 50A using the sealing member 1 in the main crimping step S03, even if the air inside the second space 14 cannot be sufficiently sucked out in any area around the entire circumference of the sealing member 1, causing poor vacuuming, the air inside the second space 14 can be reliably sucked out in other areas, and the second space 14 of the sealing member 1 as a whole can reach a predetermined vacuum state.

[0067] As shown in FIG. 4, one communication passage 15 is provided in each corner portion 1C of the sealing member 1, and the communication passage 15 is formed so as to extend, for example, from the vertex of the corner of the sealing member 1 obliquely (diagonally upward to the right in FIG. 4) toward the center of the inner periphery of the sealing member 1.

[0068] Here, at each corner portion 1C of the sealing member 1, the pressure reduction passage 11b provided in the long side portion 1A (hereinafter referred to as the "long side pressure reduction passage 11b2" as appropriate) and the pressure reduction passage 11b provided in the short side portion 1B (hereinafter referred to as the "short side pressure reduction passage 11b3" as appropriate) are connected at a predetermined angle (for example, 90°). Therefore, when air is sucked from inside the sealing member 1 through the pressure reduction passage 11b, the direction of the air flow is suddenly changed at the point where the long side pressure reduction passage 11b2 and the short side pressure reduction passage 11b3 connect. As a result, the suction force of the air inside the sealing member 1 is likely to decrease at the communicating portion, and the air inside the second space portion 14 cannot be sufficiently sucked, which is likely to cause poor evacuation.

[0069] In this embodiment, a communicating passage 15 is provided at least at the corner portion (corner portion 1C) of the sealing member 1, so that even at such a corner portion of the sealing member 1, which is prone to causing poor vacuuming, the air inside the second space portion 14 can be reliably sucked in, and the second space portion 14 can be made to reach a predetermined vacuum state.

[0070] As described above, the decompression passage 11b is connected to the vacuum pump 22 via the piping member 21. For example, as shown in FIG. 1, in this embodiment, the decompression passage 11b is connected to the vacuum pump 22 at a predetermined corner portion 1C of the sealing member 1 (a corner portion 1C1 located diagonally upward to the right in FIG. 1). In other words, the sealing member 1 connects a vacuum pump 22 that performs the vacuum process to the decompression passage 11b via a piping member 21, and has a connection point (a corner portion 1C1 in the sealing member 1) that communicates between the vacuum pump 22 and the decompression passage 11b.

[0071] On the other hand, in this embodiment, a communication passage 15 is provided at least in the corner 1C (corner 1C2 located diagonally downward to the left in FIG. 1) which is located at the position furthest from the connection point (corner 1C1).

[0072] Here, in the sealing member 1, at the position (corner portion 1C2) farthest from the connection point (corner portion 1C1) that connects the vacuum pump 22 and the decompression passage 11b, the suction force when sucking air inside the sealing member 1 through the decompression passage 11b is likely to decrease, and the air inside the second space portion 14 (see Figure 2) cannot be sufficiently sucked, which is likely to cause poor vacuuming.

[0073] For this reason, in this embodiment, as described above, a communicating passage 15 is provided at least in the corner portion 1C2 which is the farthest from the connection point (corner portion 1C1), and even at the position farthest from the connection point, it is possible to reliably suck in the air inside the second space portion 14 and bring the second space portion 14 to a predetermined vacuum state.

[0074] The above describes one embodiment of the present invention, but the present invention is not limited to such an embodiment, which is merely an example, and it goes without saying that the present invention can be embodied in various other forms without departing from the gist of the present invention. The scope of the present invention is indicated by the claims, and further includes the meaning of equivalents set forth in the claims, and all modifications within the scope of the claims. [Explanation of symbols]

[0075] 1 Sealing material 1C Corner part (corner part) 1C1 Corner part of connection (corner) 1C2 The most distant corner (corner) 11 Base 11a Contact surface 11b Decompression passage 12 Support part 12a Clamping part 12b Lip 13 First space 14 Second space 15 Communication passage 22 Vacuum pump (vacuum drawing means) 50 Laminated Glass 50A Glass Laminate (Laminate) 51 Resin interlayer 52 Plate Glass 52a End face

Claims

1. A method for producing laminated glass, comprising: subjecting a laminate formed by laminating at least two glass sheets with a resin interlayer interposed therebetween to a heating and pressurizing treatment in an autoclave; simultaneously fitting a sealing member having a frame shape that conforms to the outer shape of the laminate to a peripheral portion of the laminate; and performing a vacuum drawing treatment; thereby producing laminated glass by pressing the glass sheets together, The sealing member is When fitted onto the peripheral edge of the laminate, a base portion that abuts against an end surface of the laminate and extends along the end surface; a pair of support portions that protrude from a contact surface of the base portion with the end surface of the stack toward an inner peripheral side of the sealing member, extend along the base portion, and are disposed opposite each other at a predetermined interval in a thickness direction of the stack, The base portion is a pressure reduction passage extending along an end surface of the laminate; The support portion is a clamping portion that protrudes toward the stacked body and extends along the base portion at a midpoint in the protruding direction of the support portion, and clamps the stacked body in a thickness direction; a lip portion extending along the base at an end of the support portion in a protruding direction and capable of coming into close contact with a plate surface of the outer glass sheet, which is the glass sheet located on the outermost layer side of the laminate; The clamping unit is a space surrounded by the contact surface of the base, the inner surface of the support portion, and the plate surface of the outer glass sheet is divided into a first space located on the base side with respect to the clamping portion and a second space located on the lip side with respect to the clamping portion; a communication passage that communicates the first space and the second space, The communication passage is a groove formed on the protruding end surface of the clamping portion. A method for producing laminated glass.

2. A plurality of the communication passages are provided. The method for producing laminated glass according to claim 1 .

3. The communication passage is provided around the entire periphery of the sealing member, are arranged at equal intervals along the extension direction of the clamping portion, The method for producing laminated glass according to claim 2 .

4. The communication passage is At least, provided at the corners of the sealing member, The method for producing laminated glass according to any one of claims 1 to 3,

5. The sealing member is a connection point for connecting a vacuuming means for performing the vacuuming process to the decompression passage and for communicating the vacuuming means with the decompression passage; The communication passage is At least, the contact is provided at a position farthest from the connection point. The method for producing laminated glass according to any one of claims 1 to 4,

6. A sealing member having a frame shape that conforms to the outer shape of a laminate formed by laminating at least two glass sheets with a resin interlayer interposed therebetween, the sealing member being fitted to the peripheral edge of the laminate to perform a vacuum drawing process, When fitted onto the peripheral edge of the laminate, a base portion that abuts against an end surface of the laminate and extends along the end surface; a pair of support portions extending along the base portion, protruding from a contact surface of the base portion with the end surface toward an inner circumferential side of the sealing member, and disposed opposite each other at a predetermined interval in a thickness direction of the laminate, The base portion is a pressure reduction passage extending along an end surface of the laminate; The support portion is a clamping portion that protrudes toward the stacked body and extends along the base portion at a midpoint in the protruding direction of the support portion, and clamps the stacked body in a thickness direction; a lip portion extending along the base at an end of the support portion in a protruding direction and capable of coming into close contact with a plate surface of the outer glass sheet, which is the glass sheet located on the outermost layer side of the laminate; The clamping unit is a space surrounded by the contact surface of the base, the inner surface of the support portion, and the plate surface of the outer glass sheet is divided into a first space located on the base side with respect to the clamping portion and a second space located on the lip side with respect to the clamping portion; a communication passage that communicates the first space and the second space, The communication passage is a groove formed on the protruding end surface of the clamping portion. A sealing member characterized by:

7. A plurality of the communication passages are provided. The sealing member according to claim 6 , characterized in that

8. The communication passage is provided around the entire periphery of the sealing member, are arranged at equal intervals along the extension direction of the clamping portion, The sealing member according to claim 7 , characterized in that

9. The communication passage is At least, provided at the corners of the sealing member, The sealing member according to any one of claims 6 to 8, characterized in that

10. a connection point for connecting a vacuuming means for performing the vacuuming process to the decompression passage and for communicating the vacuuming means with the decompression passage; The communication passage is At least, the contact is provided at a position farthest from the connection point. The sealing member according to any one of claims 6 to 9, characterized in that

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