JP4963669B2 - Decorative laminated glass and method for producing the same - Google Patents

Description

  TECHNICAL FIELD The present invention relates to a decorative laminated glass in which a decorative sheet is laminated between a glass plate and sealed with a sealing resin, and a method for manufacturing the same.

  A laminated glass having a decorative body sealed between a glass plate and a glass plate is known as a decorated glass. For example, in Japanese Patent Application Laid-Open No. 5-170490 (Patent Document 1), an intermediate adhesive film is disposed on the inner surface of each of one and the other plate glass, and further, small thin pieces are scattered and disposed on the entire surface or in between. It describes a decorative laminated glass characterized in that both plate glasses are fused and integrated. According to this, the decoration effect by small thin pieces, such as mica, can be exhibited with an easy means, and it is supposed that it has a heat insulation and a heat ray reflective function. However, when unevenness or the like for diffusing light is formed on the decorative body surface, the decorative body surface is buried in the intermediate adhesive film, so the decoration effect may be lost and improvement is desired. .

  In JP-A-8-208283 (Patent Document 2), two glass plates whose main surfaces are arranged to face each other, a decorative body sheet arranged between the two glass plates, and the two glasses. A decorative laminated glass comprising a bonding member for partially bonding a plate is described. According to this, since the glass plate is only partially bonded, the bonding area can be reduced, and temperature control is easy when the adhesive is heated. In addition, since the glass plate is not bonded on the entire surface, no problem arises even if air remains between them, and complicated processing such as exhaust pressure reduction processing becomes unnecessary, and the manufacturing process can be simplified and the manufacturing cost can be reduced. Has been. Further, Patent Document 2 also describes a laminated glass with a decorative body in which a scattering prevention layer is formed on a surface of at least one of the two glass plates facing the other glass plate. . According to this, even if the glass breaks due to impact, the glass plate on which the anti-scattering layer is formed is difficult for the glass to scatter, and the anti-scattering layer is provided on the glass plate arranged on the inner side of the house. It is said that the glass can be prevented from scattering due to the impact from the inside. However, when the glass plate on the side where the anti-scattering layer is not formed is broken, it is not always possible to prevent the glass from scattering.

Japanese Patent Laid-Open No. 5-170490 JP-A-8-208283

  The present invention has been made in order to solve the above-described problems, and an object of the present invention is to provide a decorative laminated glass that is held without impairing the design of the decorative surface composed of the uneven surface of the decorative sheet.

The above problem is a decorative laminated glass in which a decorative sheet and a protective sheet are laminated between a first glass plate and a second glass plate and sealed with a sealing resin,
Sealing resin is filled between the first glass plate and the decorative sheet, and between the second glass plate and the protective sheet, and the decorative sheet has a decorative surface composed of an uneven surface, and the convex portion of the decorative surface The front end is in contact with the surface of the protective sheet, has a space not filled with sealing resin between the decorative sheet and the protective sheet, and at least one end of the decorative sheet or protective sheet is the first This is solved by providing a decorative laminated glass characterized in that it is inside the edge of the glass plate.

Furthermore, the above-mentioned problem is a method for producing a decorative laminated glass in which a decorative sheet and a protective sheet are laminated between a first glass plate and a second glass plate and sealed with a sealing resin,
The first glass plate, the first sealing resin sheet, the decorative sheet, the protective sheet, the second sealing resin sheet and the second glass plate are laminated in this order,
Arranging at least one of the decorative sheet or the protective sheet so that at least one end of the decorative sheet or the protective sheet is inside the end of the first glass plate,
It is also solved by providing a method for producing a decorative laminated glass, characterized in that the first sealing resin sheet and the second sealing resin sheet are melted by heating and then cooled and sealed.

  At this time, it is a preferred embodiment to heat at a temperature below the melting point or softening point of the decorative sheet and protective sheet.

  In the decorative laminated glass of the present invention, the decorative surface composed of the uneven surface of the decorative sheet is protected by the protective sheet and sealed with the sealing resin, so that the design of the decorative surface is maintained without being impaired. Moreover, since between the 1st glass plate and a decoration sheet and between the 2nd glass plate and a protection sheet are adhere | attached via sealing resin, either surface of a 1st glass plate and a 2nd glass plate Even if the glass is broken, the glass does not scatter and is excellent in safety. Furthermore, when the decorative laminated glass of the present invention is used as a window glass for a house, a building, etc., not only the sealing resin but also the decoration can be decorated in a short time even if the glass surface is destroyed from the outside of the window glass and an illegal intrusion is attempted. Since it is not easy to break the sheet and the protective sheet, it has an excellent crime prevention effect, and since it has a space not filled with a sealing resin, the sound insulation effect and the heat insulation effect are also improved.

  Hereinafter, the present invention will be described more specifically with reference to the drawings. FIG. 1 is a schematic cross-sectional view of an example of a decorative laminated glass of the present invention. FIG. 2 is a schematic cross-sectional view showing an example of a laminate before the sealing treatment, and includes a first glass plate 2, a first sealing resin sheet 7, a decorative sheet 3, a protective sheet 4, and a second sealing resin sheet. 8 is an example in which the second glass plate 6 is laminated in this order.

  In the decorative laminated glass 1 of the present invention, the decorative sheet 3 has a decorative surface composed of an uneven surface, and the tip of the convex portion of the decorative surface is in contact with the surface of the protective sheet 4, and the decorative sheet 3 and the protective sheet 4 has a space not filled with the sealing resin 5. Thus, since the decorative surface which consists of the uneven | corrugated surface of the decorative sheet 3 is protected by the protective sheet 4 and sealed with the sealing resin 5, the design of the decorative surface is maintained without being impaired. In particular, when the decorative sheet 3 is a sheet that diffuses or refracts light on the decorative surface, a decorative laminated glass 1 having a function equivalent to that of ground glass or a template glass is obtained, and water drops, fingerprints, and the like are attached to the glass surface. Is also preferable because the decorative function as ground glass or template glass is not impaired. Thus, when the decorative sheet 3 is a light diffusion sheet, it becomes difficult to diffuse light if the space between the decorative sheet 3 and the protective sheet 4 is filled with the sealing resin 5. The significance of adopting the configuration is great.

  The decorative laminated glass 1 of the present invention has a decorative sheet 3 and a protective sheet 4 laminated between a first glass plate 2 and a second glass plate 6, and between the first glass plate 2 and the decorative sheet 3, and The sealing resin 5 is filled between the second glass plate 6 and the protective sheet 4. Thus, since the space between the first glass plate 2 and the decorative sheet 3 and the space between the second glass plate 6 and the protective sheet 4 are fixed via the sealing resin 5, the first glass plate 2 and No matter which surface of the second glass plate 6 is destroyed, the glass is not scattered, which is excellent in safety. Furthermore, when the decorative laminated glass 1 of the present invention is used as a window glass for a house, a building, etc., even if the glass surface is destroyed from the outside of the window glass and an illegal intrusion is attempted, only the sealing resin 5 can be obtained in a short time. Since it is not easy to break up to the decorative sheet 3 and the protective sheet 4, the crime prevention effect is excellent, and since there is a space not filled with the sealing resin 5, the sound insulation effect is also excellent.

  Since the decorative laminated glass 1 of the present invention is in contact with the tip of the decorative surface made of the uneven surface of the decorative sheet 3 and the surface of the protective sheet 4, it is necessary to consider heat conduction through the contacted part. Since a space not filled with the sealing resin 5 is provided between the decorative sheet 3 and the protective sheet 4, a heat insulating effect can be expected. Here, when manufacturing the decorative laminated glass 1 of the present invention, the air between the first glass plate 2 and the second glass plate 6 is usually evacuated and sealed. At this time, since the space not filled with the sealing resin 5 between the decorative sheet 3 and the protective sheet 4 is considered to be kept in a reduced pressure state, a higher heat insulating effect can be expected. Further, as time passes, it is assumed that gas, some volatile matter, or the like enters the space that is not filled with the sealing resin 5 between the decorative sheet 3 and the protective sheet 4. Even if the reduced pressure state is not maintained, it is considered that a heat insulating effect can be expected.

  The decorative sheet 3 used in the present invention is not particularly limited as long as it has a decorative surface composed of a concavo-convex surface, and a sheet composed of plastic, metal, paper, cloth, or the like can be used. When the decorative sheet 3 and the protective sheet 4 are laminated between the first glass plate 2 and the second glass plate 6 and sealed with the sealing resin 5, the uneven shape of the decorative surface is maintained without being crushed. From the viewpoint of excellent crime prevention effect, the decorative sheet 3 is preferably made of plastic or metal. Especially, it is more preferable that the decorative sheet 3 is made of plastic from the viewpoint of lightness and handling. Moreover, when using the decorative laminated glass 1 of this invention for the use for which transparency is requested | required, it is preferable that the decorative sheet 3 is transparent. The transparency required here means that only a certain proportion of light has to be transmitted. Therefore, for example, the decorative sheet 3 may be colored or cloudy. The decorative sheet 3 made of plastic may be a single-layer resin sheet or a multilayer resin sheet having at least one resin layer. The resin used is not particularly limited, and a polyester resin typified by polyethylene terephthalate, a fluorine resin typified by polyvinylidene fluoride, a polyamide resin, a polyolefin resin, a polystyrene resin, a polycarbonate resin, an acrylic resin, and the like are preferably used. Among these, a polyester resin is more preferably used from the viewpoint of strength and adhesiveness. When the decorative sheet 3 is a multilayer resin sheet, the same type of resin or different types of resins may be laminated.

  It does not specifically limit as a method of forming uneven | corrugated shape in the decorative surface of the decoration sheet 3. As shown in FIG. For example, it may be formed using an embossing roll, may be formed by physical or chemical etching, or may be subjected to a coating treatment including particles. Here, the height of the convex portion is such that when the decorative sheet 3 and the protective sheet 4 are laminated, a space not filled with the sealing resin 5 is formed between the decorative sheet 3 and the protective sheet 4. If it is, it will not specifically limit, It is preferable that it is 0.001-0.5 mm. As for the height of a convex part, it is more preferable that it is 0.002 mm or more, and it is still more preferable that it is 0.005 mm or more. On the other hand, when the height of the convex portion exceeds 0.5 mm, the sealing resin 5 may flow between the decorative sheet 3 and the protective sheet 4, and is more preferably 0.2 mm or less. More preferably, it is 0.1 mm or less.

  The thickness of the decorative sheet 3 used in the present invention is not particularly limited, and a plate-like material to a film-like material can be used. The thickness of the decorative sheet 3 is preferably 0.01 to 1 mm. When the thickness of the decorative sheet 3 is less than 0.01 mm, the crime prevention effect may be lowered, and is preferably 0.02 mm or more, and more preferably 0.03 mm or more. On the other hand, when the thickness of the decorative sheet 3 exceeds 1 mm, the thickness of the decorative laminated glass 1 to be obtained may be increased and the manufacturing cost may be increased, and it is more preferably 0.8 mm or less, and 0.5 mm or less. More preferably. When a light diffusing sheet is used as the decorative sheet 3, the decorative sheet 3 is not only diffused on the decorative surface having a concavo-convex shape but also diffused in the decorative sheet 3 so that the incident light is diffused in the binder resin. A light diffusion layer in which light diffusion particles are dispersed may be included.

  The protective sheet 4 used in the present invention is not particularly limited as long as it can protect the decorative surface composed of the uneven surface of the decorative sheet 3 and has transparency. The transparency required here means that a certain percentage of light has only to be transmitted to the extent that the decorative surface can be visually recognized when the decorative surface is protected. Therefore, for example, the protective sheet 4 may be colored or cloudy. The material of the protective sheet 4 is not particularly limited, but is preferably made of plastic from the viewpoint of weight reduction. The protective sheet 4 made of plastic is preferably a resin sheet made of a single layer or multiple layers. The resin used is not particularly limited, and a polyester resin typified by polyethylene terephthalate, a fluorine resin typified by polyvinylidene fluoride, a polyamide resin, a polyolefin resin, a polystyrene resin, a polycarbonate resin, an acrylic resin, and the like are preferably used. Among these, a polyester resin is more preferably used from the viewpoint of strength and adhesiveness. When the protective sheet 4 is a multilayer resin sheet, the same type of resin or different types of resins may be laminated.

  The thickness of the protective sheet 4 used in the present invention is not particularly limited, and a plate-like material to a film-like material can be used. The thickness of the protective sheet 4 is preferably 0.01 to 2 mm. When the thickness of the protective sheet 4 is less than 0.01 mm, the strength of the protective sheet 4 may be reduced and it may be difficult to protect the decorative surface, and is more preferably 0.02 mm or more. More preferably, it is 03 mm or more. On the other hand, when the thickness of the protective sheet 4 exceeds 2 mm, it may be difficult to produce a laminated glass, and peeling may occur due to a difference in thermal expansion coefficient from the glass. Preferably, it is 0.8 mm or less, more preferably 0.5 mm or less.

The glass plate used by this invention is not specifically limited, It selects according to a use and the objective. Usually, although the 1st glass plate 2 and the 2nd glass plate 6 are substantially the same shape, thickness and a raw material may differ. The thickness of the glass plate is preferably 1 mm or more. If it is too thin, the glass plate may be damaged during production. Further, when the glass plate is thick, the influence of the load from above and below is large, and it takes time for heat conduction during heating, and thus there is a case where a device for sealing operation is required. The thickness of the glass plate is more preferably 2 mm or more. On the other hand, the thickness of the glass plate is preferably 20 mm or less, and more preferably 10 mm or less. Moreover, although the area of a glass plate changes with uses, according to this invention, it is also easy to manufacture the large decorative laminated glass 1 of 1 m < ² > or more.

  As the glass plate used in the present invention, tempered glass is suitably used because it is not easily damaged during bonding and is excellent in safety and crime prevention. Specifically, it is preferable to use a glass plate having a surface compressive stress of 20 MPa or more. Here, the surface compressive stress of the glass plate is a value measured according to JIS R3222. Specific examples of the glass plate having a surface compressive stress of 20 MPa or more include double strength glass, tempered glass, and super tempered glass. Double-strength glass usually has a surface compressive stress of 20 to 60 MPa, tempered glass usually has a surface compressive stress of 90 to 130 MPa, and super-tempered glass usually has a surface compressive stress of 180 to 250 MPa. Further, as the surface compressive stress is increased, the strength is improved, but the warpage tends to increase.

  The decorative laminated glass 1 of the present invention is characterized in that at least one end portion of the decorative sheet 3 or the protective sheet 4 is inside the end portion of the first glass plate 2. By this, the adhesive strength of the decorative laminated glass 1 obtained becomes favorable. In particular, both the decorative sheet 3 and the end of the protective sheet 4 are located inside the end of the first glass plate 2, so that the peripheral edge of the first glass plate 2 and the second glass plate 6 Since the peripheral edge portion is bonded via the sealing resin 5, the resulting decorative laminated glass 1 has better adhesive strength. The distance between the end of the decorative sheet 3 or the protective sheet 4 and the end of the first glass plate 2 needs to be adjusted as appropriate depending on the size of the decorative laminated glass 1 to be obtained, but is preferably 2 mm or more, More preferably, it is 5 mm or more. On the other hand, the distance between the end of the decorative sheet 3 or the protective sheet 4 and the end of the first glass plate 2 is usually 100 mm or less.

  The material of the sealing resin 5 used in the present invention is not particularly limited as long as it is transparent and has thermoplasticity and adhesiveness, and is made of ethylene-vinyl acetate copolymer (EVA), polyvinyl butyral, and polyurethane. One kind of resin selected from the group is preferably used. At this time, a thermoplastic resin that can be cross-linked, particularly a resin that undergoes a cross-linking reaction by heating, is preferable from the viewpoint of strength and durability. Therefore, such a resin is sandwiched between the first glass plate 2 and the decorative sheet 3 and between the protective sheet 4 and the second glass plate 6 in the form of a sheet, heated and melted, and then as necessary. The cross-linking reaction is allowed to proceed, and then cooled and solidified to seal the decorative sheet 3 and the protective sheet 4. By using a material that is crosslinked by heating, it is possible to achieve excellent durability and adhesiveness. The thermoplastic resin that can be crosslinked is not particularly limited as long as the crosslinking reaction proceeds when heated. For example, EVA can be crosslinked by blending and heating a crosslinking agent, and polyurethane can be crosslinked by reacting an isocyanate group and a hydroxyl group.

  When polyurethane is used as the sealing resin 5, since it is excellent in flexibility, it is preferable that peeling does not occur even when a material having a large coefficient of thermal expansion such as glass and plastic is used in combination. Furthermore, polyurethane has excellent penetration strength.

  Among the crosslinkable thermoplastic resins, it is preferable to use a thermoplastic resin containing a crosslinking agent. The thermoplastic resin at this time is not particularly limited as long as the crosslinking reaction proceeds when heated together with the crosslinking agent, but an ethylene-vinyl acetate copolymer (EVA) excellent in transparency, flexibility, durability and the like. Is most preferably used. Further, as the ethylene-vinyl acetate copolymer (EVA), a vinyl acetate unit partially saponified may be used.

  In manufacturing the decorative laminated glass 1 of the present invention, the sealing resin sheet is sandwiched between the first glass plate 2 and the decorative sheet 3 and between the second glass plate 6 and the protective sheet 4 and heated and melted. Then, the decorative sheet 3 and the protective sheet 4 are sealed by cooling and solidifying. It is preferable that the sealing resin sheet contains a crosslinking agent in EVA resin. In this case, the resin is heated and melted and then a crosslinking reaction is allowed to proceed, followed by cooling to seal with the crosslinked EVA. Can do. The EVA in the sealing resin sheet preferably has a melting point of 50 to 80 ° C. measured by the DSC method from the viewpoint of the balance between transparency and form retention.

  The sealing resin sheet may have an appropriate emboss on one side or both sides thereof, thereby preventing blocking and facilitating suppression of remaining bubbles. The thickness of the sealing resin sheet is preferably 0.1 mm or more, and more preferably 0.2 mm or more. By setting the thickness to a certain value or more, the glass plate and the decorative sheet 3 are bonded uniformly. On the other hand, the thickness of the sealing resin sheet is usually 3 mm or less, and preferably 2 mm or less. One or more sealing resin sheets can be stacked and used with the thickness adjusted.

  In the present invention, various easy adhesion treatments may be performed. Here, the easy adhesion treatment refers to a treatment for imparting a function of improving the adhesion between sheets. In the present invention, when improving the adhesion between the sealing resin sheet and the decorative sheet 3, it is preferable to perform an easy adhesion treatment on the surface of the sealing resin sheet on the side in contact with the decorative sheet 3, When improving the adhesiveness with the protective sheet 4, it is preferable to perform an easy adhesion treatment on the surface of the sealing resin sheet on the side in contact with the protective sheet 4. Further, the decorative sheet 3 and the protective sheet 4 may be subjected to easy adhesion treatment in advance. Examples of the easy adhesion treatment include, for example, a treatment for forming a primer layer by applying a urethane resin typified by an isocyanate primer on the sheet surface, a treatment for applying a silane coupling agent, a corona treatment, a plasma treatment, and an ultraviolet irradiation treatment. Etc.

  The decorative laminated glass 1 is manufactured using the decorative sheet 3, the protective sheet 4, the glass plate, and the resin sheet described above. A specific manufacturing method will be described below.

  First, the laminated structure will be described with reference to FIG. FIG. 2 is a schematic cross-sectional view showing an example of a laminate before the sealing treatment, and includes a first glass plate 2, a first sealing resin sheet 7, a decorative sheet 3, a protective sheet 4, and a second sealing resin sheet. 8 and the 2nd glass plate 6 are laminated | stacked in this order.

  First, the first sealing resin sheet 7 is stacked on the first glass plate 2 so as to substantially cover the entire surface. The first sealing resin sheet 7 is in contact with the back surface of the decorative sheet 3. Subsequently, the decorative sheet 3 and the protective sheet 4 are laminated in this order on the first sealing resin sheet 7 so that the uneven surface of the decorative sheet 3 is in contact with the protective sheet 4. At this time, it arrange | positions so that the at least one edge part of the decoration sheet 3 and the protection sheet 4 may exist inside the edge part of the 1st glass plate 2. FIG. By this, the adhesive strength of the decorative laminated glass 1 obtained becomes favorable. As a method of arrangement, it is preferable to arrange the decorative sheet 3 and the protective sheet 4 so that the central axes thereof overlap. Next, the 2nd sealing resin sheet 8 and the 2nd glass plate 6 are laminated | stacked on the protective sheet 4, and the laminated body 10 before a sealing process is obtained. At this time, you may arrange | position a resin sheet piece to the peripheral part of the decoration sheet 3 or the protection sheet 4, and this can improve the adhesive strength of the decorative laminated glass 1 obtained. In the present invention, a plurality of decorative sheets 3 and protective sheets 4 may be stacked. In particular, in the case where a decorative surface made of a concavo-convex surface is formed on both surfaces of the decorative sheet 3, a configuration in which the protective sheets 4 are laminated on both surfaces of the decorative sheet 3 is preferably employed.

  The method for producing the decorative laminated glass 1 of the present invention is characterized in that the laminated body is heated to melt the first sealing resin sheet 7 and the second sealing resin sheet 8, and then cooled and sealed. At this time, it is preferable to melt after discharging the air between the first glass plate 2 and the decorative sheet 3 and between the protective sheet 4 and the second glass plate 6. On the other hand, air may remain in the space not filled with the sealing resin 5 between the decorative sheet 3 and the protective sheet 4, but from the viewpoint of further enhancing the heat insulating effect of the resulting decorative laminated glass 1. It is preferable that air is discharged so as to be almost in a vacuum state.

  FIG. 3 is a schematic diagram of an example of a sealing processing apparatus. This sealing processing apparatus has a plurality of sealing processing containers 11 that accommodate the laminate 10 therein, and discharges air in the sealing processing container, heating operation and pressure adjusting operation in the sealing processing apparatus. Is possible. A part or all of the sealing processing container 11 is made of a gas-impermeable flexible film. The material of the membrane may be a gas-impermeable flexible membrane, which has a certain degree of flexibility and strength, and when the inside of the membrane is evacuated or the outside of the membrane is in a pressurized state. There is no particular limitation as long as the external air pressure is uniformly applied to the entire laminate 10, and a sheet or film of rubber or resin can be used. At this time, it is preferable to use a bag made of a flexible film which is entirely impermeable to gas. In this case, since the sealing treatment container 11 is a mere bag, it can be flexibly handled when manufacturing the decorative laminated glass 1 having various shapes and dimensions, such as various building materials and interior materials. Suitable for applications that require the production of sized products.

  In particular, in the laminate 10, when at least one of the first glass plate 2 or the second glass plate 6 is a curved glass plate, it is preferable to use such a sealing processing container 11. When the inside of the sealing treatment container 11 is depressurized and a load from above and below is applied to the laminate 10, it is possible to prevent the glass plate from being broken. In this case, it is preferable to seal the bag which is the sealing processing container 11 along the surface of the glass plate.

  Moreover, it is preferable to use such a sealing processing container 11 also when the laminated body 10 has the member which protruded outside from the glass plate like an attachment metal fitting. Also in this case, it is preferable to seal the bag, which is the sealing processing container 11, after the shape of the protruding member is met. Depending on the shape of the protruding member, a bag having a pocket corresponding to the shape may be used. In order to prevent an excessive load from being applied to the protruding portion, it is also preferable that the protruding portion is covered with a cover that is not easily deformed during decompression and then introduced into the sealing treatment container 11. By doing so, it is possible to prevent the sealing processing container 11 from being damaged.

  When introducing the laminate 10 into the sealing container 11, the outer edge of the laminate 10 is covered with a bleeder 12 made of a breathable material to prevent the molten resin inside the laminate 10 from flowing out, It is preferable to secure a discharge route of air from the inside of the laminate 10. As a material used for the bleeder 12, fabrics such as woven fabric, knitted fabric, and non-woven fabric can be used.

  In this way, the plurality of sealing processing containers 11 in which the laminated body 10 is put are introduced into the oven 13 and arranged in parallel with a space between each other. Thereby, the laminated bodies 10 in the sealing processing container 11 are arranged in parallel to each other. It is preferable that the plurality of sealing processing containers 11 are arranged so as to overlap with each other in the vertical direction. The method of arranging with a predetermined interval is not particularly limited, and a method of providing a shelf having a predetermined interval in the oven 13 is exemplified.

  The laminated body 10 is heated by flowing hot air in a direction parallel to the laminated body 10 in the oven 13. By flowing hot air in a direction parallel to the laminate 10, heat can be efficiently and uniformly transmitted to the laminate 10. At this time, it is preferable that the hot air is also in contact with the lower surface of the sealing processing container 11. For this purpose, a method of arranging a spacer between the sealing processing container 11 and the shelf, or the shelf itself as a net shelf. The method of performing etc. is employ | adopted suitably. The method for supplying hot air is not particularly limited, and a heater may be provided in the oven 13 and the hot air may flow in a direction parallel to the laminate 10 using a fan. However, a method in which a heater is provided outside the oven 13 and hot air is introduced into the oven 13 is preferable because it facilitates uniform heating. In this case, the oven 13 has a hot air inlet and a hot air outlet provided on the opposite side, and a plurality of sealing processing containers 11 are arranged between passages flowing from the hot air inlet to the hot air outlet. It is preferred that Moreover, it is preferable from the surface of apparatus cost that the laminated body 10 is heated, maintaining the inside of oven 13 at substantially atmospheric pressure.

  In the sealing process, the inside of the sealing process container 11 is depressurized and the air between the first glass plate 2 and the second glass plate 6 is discharged. In the sealing processing apparatus of FIG. 3, a pipe 14 for exhausting air is connected to each sealing processing container 11. Three pipes 14 are collected and connected to the pipe 15. Further, six pipes 15 (partially omitted in illustration) collected in this way are connected to the tank 16. The tank 16 is connected to a vacuum pump 17, whereby the air inside the sealing processing container 11 can be discharged. The number of the sealing processing containers 11 is not particularly limited as long as it is plural, but in consideration of production efficiency, it is preferably 6 or more, and more preferably 12 or more.

  A pressure gauge 19 is connected to each of the six pipes 15 via a valve 18, and a pressure regulating valve 20 capable of blocking the flow in the pipe 15 is provided. As a result, when a leak occurs in any of the sealing processing containers 11 connected to the pipe 15, the pressure gauge 19 detects an increase in pressure, and the control circuit 21 sends a signal to the pressure adjusting valve 20 to detect the pressure. The regulating valve 20 is closed. Thereby, even if a leak occurs in one sealing processing container 11 during the sealing operation, it is possible to prevent the other sealing processing containers 11 from being adversely affected. The sealing processing container 11 used in the present invention is made of a flexible sheet and needs to be prepared in various shapes according to the form of the decorative laminated glass 1, so that there is a risk of leakage. . Therefore, it is preferable to employ such a control method. In the example of FIG. 3, one control is performed for each of the three sealing processing containers 11, but this is based on the balance between the equipment cost and the effect. The set of the pressure gauge 19 and the pressure regulating valve 20 may be two sets or more, preferably three sets or more, more preferably five sets or more. An alarm signal can be issued from the control circuit 21 to notify the operator.

  The six pipes 15 are connected to the tank 16, and all the sealing processing containers 11 communicate with the tank 16 in a state where the pressure regulating valve 20 is open. The air in the tank 16 is discharged by the vacuum pump 17. In addition, outside air can be introduced into the tank 16 via the control valve 22.

  In the sealing processing apparatus of FIG. 3, by controlling the pressure in the tank 16, the pressures in all the sealing processing containers 11 can be controlled simultaneously. The pressure inside the tank 16 is measured by a pressure gauge 24 connected via a valve 23, and a control circuit 25 that receives this pressure data sends a signal to the control valve 22 to finely adjust it to a desired pressure while taking in outside air. To do. During this time, the vacuum pump 17 continues to operate. By controlling the tank 16 having a relatively large capacity while taking in outside air, the pressure in the sealing processing container 11 can be finely adjusted.

  In addition, before starting the pressure reducing operation in the sealing processing container 11, the pressure in the tank 16 is reduced in advance by operating the vacuum pump 17 with the pressure regulating valve 20 and the control valve 22 closed. You can also. In this case, the air in the sealing processing container 11 can be quickly discharged by opening the pressure regulating valve 20. This helps to quickly depressurize the inside of the sealing processing container 11 even when the exhaust capacity of the vacuum pump 17 is small.

  Although the capacity | capacitance of the tank 16 is not specifically limited, It is preferable that it is 10 liters or more, and it is more preferable that it is 20 liters or more. If the capacity is too large, pressure control by the control valve 22 may not be performed quickly. The sealing processing apparatus used in Examples described later was provided with a 50 liter tank 16.

  Although not specifically shown in FIG. 3, it is also preferable to provide at least one temperature control chamber adjacent to the oven 13 and perform a preheating operation or a cooling operation in the temperature control chamber. As a result, the cycle time of the sealing operation can be shortened by the time required for the preheating operation and the slow cooling operation. The temperature control chamber is not particularly limited as long as it is disposed adjacent to the oven 13 and can adjust the temperature inside thereof.

  Using the sealing processing apparatus as described above, air between the first glass plate 2 and the second glass plate 6 is discharged, heated to melt the resin, and then cooled and sealed. The temperature condition at this time is not particularly limited, and may be increased to a temperature at which the resin can be melted. If the resin is a crystalline resin, it may be heated to the melting point of the resin or higher. Further, if the sealing resin is a crosslinkable thermoplastic resin, the sealing resin is raised to a crosslinkable temperature and maintained at a crosslinkable temperature for a predetermined time. The pressure is not particularly limited as long as the pressure in the laminated body 10 can be discharged to reduce the remaining bubble, but the pressure is not particularly limited. It is preferable to do. Further, from the viewpoint of preventing the sealing resin from entering between the decorative sheet 3 and the protective sheet 4, even when the sealing resin is melted or softened, an operation for decreasing the degree of vacuum and increasing the pressure is performed. Good. Moreover, you may scrape uneven | corrugated shape about several millimeters from the edge part of the decoration sheet 3 by performing a grinding | polishing process. Accordingly, when pressure is applied from above and below the laminated body 10, the peripheral portion of the decorative sheet 3 and the peripheral portion of the protective sheet 4 come into contact with each other, so that the sealing resin is interposed between the decorative sheet 3 and the protective sheet 4. Intrusion can be prevented.

  Specifically, when sealing in the sealing process container 11, a step of reducing the pressure in the sealing process container at a temperature lower than the melting point of the sealing resin (step 1), the melting point of the sealing resin being kept at a reduced pressure or higher. It is preferable to perform a sealing operation consisting of each step of the step of raising the temperature to the temperature (step 2), the step of cooling (step 3), and the step of raising the pressure in the sealing treatment container (step 4). is there. When a crosslinkable thermoplastic resin is used as the sealing resin, a step of allowing the crosslinking reaction to proceed in a temperature range where the crosslinking reaction proceeds after step 2 may be additionally performed.

  Step 1 is a step of reducing the pressure inside the sealing processing container 11 at a temperature lower than the melting point of the sealing resin. By reducing the pressure at a temperature lower than the melting point of the sealing resin, a passage through which air inside the laminate 10 is discharged is secured. At this time, the pressure in the sealing treatment container 11 is preferably reduced to 0.01 MPa or less, more preferably 0.005 MPa or less. By sufficiently reducing the pressure, the remaining bubbles after sealing can be effectively suppressed.

  Step 2 is a step of raising the temperature to a temperature equal to or higher than the melting point of the sealing resin while reducing the pressure, and is a step performed subsequent to Step 1. When the temperature of the sealing resin is raised, the elastic modulus is greatly reduced near the melting point and the liquid is changed to a highly viscous liquid. Step 2 is a step of keeping the pressure reduced until reaching such a temperature. The lower limit value of the temperature reached by the temperature raising operation in step 2 is preferably (Tm + 10) ° C. or more, and more preferably (Tm + 20) ° C. or more. In many sealing resins, a suitable lower limit is 80 ° C. or higher, and more preferably 85 ° C. or higher. Moreover, an upper limit is 200 degrees C or less normally. Here, when raising the temperature, it is preferable to heat at a temperature below the melting point or softening point of the decorative sheet 3 and the protective sheet 4. Thereby, it is possible to prevent the decorative sheet 3 and the protective sheet 4 from being damaged.

  The rate of temperature increase in step 2 is preferably slow, and the time taken to increase the temperature from room temperature to the above temperature is preferably 2 minutes or more, and more preferably 5 minutes or more. If the temperature is raised slowly, the peripheral portion is hard to melt first, and no bubbles remain in the central portion. At this time, the rate of temperature increase may be changed in the middle, or a balancing operation may be performed to stop the temperature increase and eliminate the temperature distribution inside the laminate 10. From the viewpoint of productivity, the temperature raising time is usually 5 hours or less, and preferably 2 hours or less.

  Step 3 is a step of cooling and is a step performed subsequent to step 2. In step 3, the glass plate is usually cooled to near room temperature, but if the cooling rate is too fast, the glass plate may break. Moreover, there exists a possibility that curvature may generate | occur | produce in the decorative laminated glass 1 obtained. Accordingly, the cooling is preferably performed for 5 minutes or more, and more preferably for 10 minutes or more.

  Step 4 is a step of increasing the pressure in the sealing treatment container 11. The step 4 is a step performed subsequent to the step 3, but may be performed before or after the step 3, or may be performed simultaneously with the step 3. Usually, the pressure is increased to substantially the same pressure (0.1 MPa) as atmospheric pressure. If the pressure is increased after cooling to near room temperature in step 3, the pressure may be increased in a short time. However, when the pressure is increased when the resin is in a molten state, it is preferable to increase the pressure slowly. Further, the voltage may be increased stepwise.

  The decorative laminated glass 1 thus obtained is filled with the sealing resin 5 up to the peripheral portion and can be sealed up to the peripheral portion with the sealing resin 5 having excellent adhesiveness and durability. A high decorative laminated glass 1 can be provided. In particular, when both ends of the decorative sheet 3 and the protective sheet 4 are inside the end of the glass plate, the end face of the decorative sheet 3 or the protective sheet 4 is not exposed at the periphery of the sealing resin layer, and more A highly reliable decorative laminated glass 1 can be provided.

  According to the manufacturing method of sealing in a sealing treatment container made of a gas impermeable flexible sheet, when at least one of the first glass plate 2 or the second glass plate 6 is a curved glass plate Even so, the sealing operation is easy. In this case, the decorative laminated glass 1 sandwiched between the bent glasses can be provided, so that the demand for diversification of the design of the building can be met. In addition, a metal fitting for fixing the decorative laminated glass 1 is provided, the metal fitting is inserted into a through hole formed in the glass plate, an end portion on the head side of the metal fitting is disposed on the sealing resin layer side, The decorative laminated glass 1 with the opposite end projecting outward can also be easily manufactured. Thereby, the decorative laminated glass 1 applicable to the DPG method which has been widely used in recent years can be provided.

  In the decorative laminated glass 1 of the present invention, the decorative surface composed of the uneven surface of the decorative sheet 3 is protected by the protective sheet 4 and sealed with the sealing resin 5, so that the design of the decorative surface is maintained without being impaired. . In particular, when the decorative sheet 3 is a light diffusion sheet that diffuses light on the decorative surface, the decorative laminated glass 1 that functions as a ground glass is obtained. In addition, since it can be easily adapted to various shapes and dimensions, it is preferably used for the outer wall, roof, window, ceiling, inner wall, etc. of buildings.

  Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic cross-sectional view of an example of a decorative laminated glass of the present invention, and FIG. 2 is a schematic cross-sectional view of an example of a laminate before a sealing operation. The 1st glass plate 2 and the 2nd glass plate 6 in FIG.1 and FIG.2 are soda lime glass, and used the glass plate of 210 mm long, 290 mm wide, 5 mm in thickness, and the surface compressive stress (100) MPa. On the 1st glass plate 2, the 1st sealing resin sheet 7 which is an intermediate film for glass bonding was laminated | stacked. The first sealing resin sheet 7 having the same dimensions as the first glass plate 2 was used. In this example, a 0.25 mm thick EVA sheet (Takemelt F700) manufactured by Matsuura Corporation was used as an interlayer film for laminated glass. In this example, the same sealing resin sheet was used.

  Next, a light diffusing sheet made of polyethylene terephthalate, on which a light diffusing process having a convex portion height of about 10 to 50 μm was applied as a decorative sheet 3 on the first sealing resin sheet 7. In this example, a 115 μm-thick light diffusion sheet (manufactured by Kimoto Co., Ltd., trade name Light-up) cut into 190 mm in length and 270 mm in width was used. Subsequently, a protective sheet 4 for protecting the light diffusion processed surface of the light diffusion sheet from the intermediate film was stacked. In this example, a protective sheet 4 made of polyethylene terephthalate having a thickness of 0.1 mm (trade name Lumirror film manufactured by Toray Industries, Inc.) cut into 190 mm in length and 270 mm in width was used. Here, the protective sheet 4 and the light diffusing sheet are cut so that the margin of the peripheral portion is 10 mm as compared with the first glass plate 2, and the central axes of the light diffusing sheet and the protective sheet 4 are the same. It was piled up to become.

Next, in order to improve the adhesiveness between the second sealing resin sheet 8 and the protective sheet 4, about ²⁰ to 50 g / m ² of an isocyanate-based primer was applied to the surface of the protective sheet 4 on the side in contact with the second sealing resin sheet 8. . The second sealing resin sheet 8 was stacked on the protective sheet 4 after waiting for the solvent to evaporate for several minutes. A second sealing resin sheet 8 having the same dimensions as the first glass plate 2 was used. Subsequently, a second glass plate 6 having a length of 210 mm, a width of 290 mm, and a thickness of 5 mm was overlapped to obtain a laminate 10.

  Sealing operation was performed using the laminated body 10 obtained in this way, using the sealing processing apparatus shown in FIG. First, the entire periphery of the outer edge of the laminate 10 was covered with a bleeder 12, put into a sealing treatment container 11, connected to a pipe 14, and placed in an oven 13.

  After setting as described above, the sealing process operation of the following steps 1 to 4 was performed. The temperature and pressure at this time were controlled as shown in Table 1 and FIG. At this time, the temperature is the temperature in the oven 13, and the pressure is a pressure set by the pressure regulating valve 20.

Step 1: “Depressurizing the inside of the sealing treatment container at a temperature lower than the melting point of the sealing resin at the temperature inside the sealing treatment apparatus”
While maintaining at room temperature (20 ° C.) for 10 minutes, the inside of the sealing treatment container was depressurized from atmospheric pressure to less than 0.005 MPa.

Step 2: “Step of raising the temperature to a temperature equal to or higher than the melting point of the sealing resin while reducing the pressure inside the sealing treatment container”
The temperature was raised from room temperature (20 ° C.) to 100 ° C. over 20 minutes and maintained at 100 ° C. for 30 minutes. During this time, the pressure in the sealing treatment container was maintained at less than 0.005 MPa.

Process 3: “Cooling process”
It cooled from 100 degreeC to 20 degreeC over 20 minutes. During this time, the pressure in the sealing treatment container was maintained at less than 0.005 MPa.

Step 4: “Step of increasing the pressure in the sealing treatment container”
The pressure in the sealing treatment container was increased to 0.1 MPa (atmospheric pressure) and taken out from the oven 13.

It is a cross-sectional schematic diagram of an example of the decorative laminated glass after sealing operation. It is a cross-sectional schematic diagram of an example of the laminated body before sealing operation. It is a schematic diagram of an example of a sealing processing apparatus. It is the figure which showed the temperature and pressure at the time of the sealing process in Example 1. FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Decorative laminated glass 2 1st glass plate 3 Decorative sheet 4 Protection sheet 5 Sealing resin 6 2nd glass plate 7 1st sealing resin sheet 8 2nd sealing resin sheet 10 Laminated body 11 Container 12 Breeder 13 Oven 14, 15 Pipe 16 Tank 17 Vacuum pump 18, 23 Valve 19, 24 Pressure gauge 20 Pressure adjustment valve 21, 25 Control circuit 22 Control valve

Claims (3)

A decorative laminated glass in which a decorative sheet and a protective sheet are laminated between a first glass plate and a second glass plate and sealed with a sealing resin,
Sealing resin is filled between the first glass plate and the decorative sheet, and between the second glass plate and the protective sheet, and the decorative sheet has a decorative surface composed of an uneven surface, and the convex portion of the decorative surface The front end is in contact with the surface of the protective sheet, has a space not filled with sealing resin between the decorative sheet and the protective sheet, and at least one end of the decorative sheet or protective sheet is the first A decorative laminated glass characterized in that it is inside the edge of the glass plate. A method for producing decorative laminated glass, in which a decorative sheet and a protective sheet are laminated between a first glass plate and a second glass plate and sealed with a sealing resin,
The first glass plate, the first sealing resin sheet, the decorative sheet, the protective sheet, the second sealing resin sheet and the second glass plate are laminated in this order,
Arranging at least one of the decorative sheet or the protective sheet so that at least one end of the decorative sheet or the protective sheet is inside the end of the first glass plate,
A method for producing a decorative laminated glass, comprising heating and melting the first sealing resin sheet and the second sealing resin sheet and then cooling to seal.   The manufacturing method of the decorative laminated glass of Claim 2 heated at the temperature below melting | fusing point or a softening point of a decoration sheet and a protection sheet.

Images