JPH0253380B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Application) The present invention relates to a method for manufacturing double-glazed glass, and more particularly to a method for manufacturing double-glazed glass incorporating a stretched functional film. The double-glazed glass according to the present invention has a high heat insulating property and has an energy saving effect, and can be used for windows of buildings and trains, doors and windows of storage cases for storing food and drinks, such as frozen storage cases and refrigerated storage cases. It can also be used for other openings that require heat insulation and transparency. (Prior art) One way to improve the thermal insulation properties of double-glazed glass is to increase the number of glass panes to create triple- or quadruple-glazed glass. It is large and difficult to handle and install. For this reason, various methods have been proposed for double-glazing, that is, for spreading transparent films or functional films between two glass plates. Transparent films and functional films are plastic films (hereinafter abbreviated as films), so if they are simply placed inside double-glazed glass, the film will wrinkle or loosen, which is unfavorable in terms of appearance. For the purpose of applying tension to the film to eliminate wrinkles and slack in the film, there is a method of attaching an elastic body to the double-layered glass, or a method of fixing the film in a slightly wrinkled state to a film fixing jig, and then heating the film to remove the film. Methods have been proposed to eliminate wrinkles by utilizing the heat shrinkability of. (Problems) However, the above-mentioned proposed methods have various drawbacks. The method using an elastic body has the following problems. A special jig is required to attach the elastic body. The jig requires extra space and reduces the effective area of the double glazing. For example, the durability of the elastic body is insufficient. Further, although the method using the heat shrinkability of the film overcomes the problems described in the method using an elastic body, this method also has the following problems. A heating device is required to heat shrink the film. When heat shrinking a film, it is difficult to shrink the film uniformly. etc. (Means) In order to overcome this problem, the inventors of the present invention have made extensive studies and found that the film is oriented in two directions in advance.
By fixing the film on a jig after stretching it by 0.02 to 1.0%, there is no need for any special jig or elastic body, and there is no need for a heating device.
It has been discovered that it is possible to obtain double-glazed glass by expanding a functional film that has no wrinkles or slack in the film. That is, the present invention relates to a double-glazed glass formed by expanding a functional film, in which the functional film is stretched by 0.02% to 1.0% in two axial directions, while maintaining the stretched state within the above range. Double-glazed glass containing a stretched functional film, comprising the steps of fixing the functional film to a jig fixed to a glass plate, and sealing the periphery of a second glass plate. This is a manufacturing method. In the double-glazed glass of the present invention, an inorganic or organic material, that is, an organic polymer can be used as the transparent plate, but the film is fixed in a stretched state to a fixing jig, and the jig is fixed to the transparent plate. Therefore, a transparent plate is required to have a certain level of physical strength or more, and chemical stability is also required. Therefore, an inorganic glass plate is preferable as such a transparent plate. Further, the thickness is not particularly limited, but usually 2.5 mm to 6 mm is preferably used. Moreover, a translucent glass plate can also be used. The functional film fixing jig is fixed to a transparent glass plate in advance, but it is necessary to firmly fix the jig to the glass plate over the entire area or substantially the entire area. Further, the functional film fixing jig used in the present invention can be used as is, which is currently available on the market and is made of aluminum, steel, or the like. Regarding the functionality of the functional film, it is preferable that the double-glazed glass has a selective light transmitting function of transmitting visible light and blocking infrared rays, since the double-glazed glass has good heat insulation properties. As mentioned above, the light selective transmittance function generally allows visible light to pass through but many reflect infrared rays, but it is not limited to just using a transparent film with an ultraviolet absorber, an infrared absorber, a near-infrared absorber, or a visible light absorber. It is also possible to use in the method of the present invention those provided with functionality by using agents, visible light reflecting functions, etc. singly or in combination. Further, as an example of a functional film, there is a film that is provided with transparent conductive functionality. This functionality can be provided by providing a transparent film with a thin film of indium oxide and tin oxide, or a thin film layer of metal such as gold, silver, copper, or aluminum. As an example of the so-called selective light transmittance function that transmits the visible light range and reflects the invisible infrared light range,
The following metal thin film laminate is laminated on one or both sides of the film. The metal thin film laminate includes thin films of metals such as gold, silver, copper, aluminum, nickel, palladium, tin, titanium, zinc, etc. and alloys thereof, or mixtures thereof, or a laminate of these thin films, or one side or one side of a thin film of this metal. An example is one in which metal oxide (dielectric) is laminated on both sides. Examples of metal oxides include titanium, indium, bismuth, zinc sulfide, tungsten, zirconium,
Examples include various oxides such as silicon. Further, a protective layer or a protective film may be provided on these surfaces. The film here refers to a "plate-shaped body that is flexible at room temperature," and in the present invention, it can be of any thickness, but a particularly thin film will give preferable results. . That is, it is preferable that the film has a thickness of 20 μm to 100 μm. Film materials include polyolefins such as polyethylene and polypropylene; aromatic polyesters such as polyethylene terephthalate and polyethylene naphthalate; polycarbonate; vinyl halides such as vinyl chloride, vinylidene chloride, and vinylidene fluoride; polyamides such as nylon 6 and nylon 6.6. A biaxially stretched film of polyethylene terephthalate is particularly preferably used because it can maintain its stretched state for a long period of time in terms of strength and dimensional stability. In addition to these simple films, it is also possible to use a so-called laminate film, which is a laminate in which a plurality of these films are stacked one on top of the other. In addition, after stretching the functional film in advance by 0.02 to 1.0% in two axial directions, which is a feature of the present invention,
By taking the step of fixing the functional film to a jig fixed in advance to the first glass plate while maintaining its stretched state within the above-mentioned range, some of the problems that are likely to occur during processing of the functional film can be avoided. Weak wrinkles, bumps, and unevenness disappear due to the stretching, and
Since the functional film is fixed in a stretched state at room temperature, rather than in its normal state, the appearance of the double-glazed glass made by stretching the functional film is maintained well. At that time, stress is applied to the jig to which the functional film is fixed, but since the jig is firmly fixed to the glass plate, which has excellent mechanical strength, the jig can withstand the stress. and the functional film maintains the elongation before fixing or slightly lower elongation,
This makes it possible to obtain double-glazed glass with no wrinkles and a good appearance. The method of stretching the functional film in two axial directions is not particularly limited, but it is preferable to use a method that can adjust the tension. For example, metal on the four sides of the film,
After attaching wooden boards or the like with double-sided tape, adhesive, or clips, place them on the four sides of a metal or wooden frame that has openings larger than the glass board.
Thereafter, the metal or wooden board is stretched with a spring, screw, tape, etc. to stretch the film, and in this state the board is fixed to the frame. Moreover, it can also be carried out by directly pulling with a tape or the like without using the above-mentioned metal or wooden board. After fixing the functional film in a stretched state to a jig, when the tension stretching the functional film is removed, the functional film will return to its original state.
The stress acts on the jig and glass plate, and the transparent glass, plate, and jig may be slightly deformed. In such a case, in order to maintain the elongated state of the functional film even after deformation, the elongation of the functional film before fixing is preferably 0.02% or more. More preferably, it is 0.03% or more. A functional film whose base film is a biaxially oriented polyethylene terephthalate film with excellent mechanical strength, which is preferably used in the present invention, is
%, it requires a great deal of force and is not only difficult to work with, but also the transparent thin film layer, metal thin film layer, which exhibits the functionality of the functional film.
This is undesirable because it causes cracks in the thin metal oxide film and deteriorates due to light and heat. If it is 1.0% or less, it will not cause cracks and will give a favorable result. Furthermore, it goes without saying that in the method used in the present invention, the number of films spread between two glass plates can be increased, and a large number of films, such as two, three, etc., can be provided. In this way, the functional film is fixed to the first glass plate via the jig, and then the second glass plate is placed opposite thereto. To place the second glass plate oppositely, use a jig (spacer) to determine the gap between the functional film and the second glass plate.
Use. This jig (spacer) may have the same shape as the functional film fixing jig described above. Thus, the first glass plate, the functional film,
After the second glass plate and the second glass plate are set and arranged with a predetermined gap between them, the periphery of the glass plate is sealed, thereby making it possible to create double-glazed glass with a built-in expanded functional film. (Effects of the Invention) According to the present invention, it is possible to obtain double-glazed glass in which a functional film is stretched and has a good appearance without wrinkles or slack, without requiring any special post-treatment of the functional film or using an elastic body. It can be effectively used for the windows of buildings, trains, etc., and the windows and doors of frozen and refrigerated cases. The elongation of the film was defined by the following formula. Elongation rate (%) = L - L ₀ / L ₀ × 100 L ₀ : Initial length between two points L: Length between two points after stretching the film The present invention will be further explained by the following examples. explain in detail. Examples 1 to 4 A stretched polyethylene terephthalate film (trade name "TEIJIN TETRON" film) was coated with a titanium oxide thin film layer with a thickness of 100 Å as the first layer, and a metal thin film layer of silver and copper with a thickness of 140 Å as the second layer. The weight ratio of copper is 90:10), and the thickness is 100% as the third layer.
A transparent film (hereinafter abbreviated as film-2) having a light selective transmission function was obtained by sequentially laminating titanium oxide thin film layers having a thickness of 1.5 μm. The titanium oxide thin film layer is made of 3 parts of tetrabutyl titanate and 65 parts of isopropyl alcohol.
A solution consisting of 1.5 parts and 32 parts of normal hexane was coated with a bar coater and heated at 130°C for 3 minutes. The metal thin film layer was provided by vacuum deposition by heating an alloy of silver and copper in an aluminum crucible at a vacuum level of 5×10 ^-5 Torr. The obtained film-2 was
It had a visible light transmittance of 70% and a light selective transmittance function of 52% of solar energy. On the other hand, place an aluminum plate (0.5 mm thick) in the shape of a rectangular column with a notch on the inner four sides of the part to be sealed (5 mm from the outer periphery) of the two glass plates (width 500 mm x height 800 mm x thickness 3 mm). Use the bent jig (width 7 mm x height 6 mm) with adhesive Cemedine High Super (Cemedine Kogyo Co., Ltd.)
It was glued and fixed using (manufactured by). Next, the opening is larger than the glass plate (width 600mm x height)
A strong wooden frame with a diameter of 900 mm was prepared. On the other hand, the film 2 was fixed to the wooden frame while being stretched using a spring. At that time, the elongation of film-2 was set to 0%, 0.02%, 0.5%,
It was carried out at 1.0% and 1.1%. One of the two glass plates to which the jig is glued and fixed is used as a functional film fixing glass plate (first glass plate), and the other is used as a glass plate opposite to it (second glass plate). Using. However,
Cemedine High Super was applied to the jig surface of the first glass plate having the functional film fixing jig, and double-sided tape was attached to the jig surface of the second glass plate. The wooden frame is placed on a table with a horizontal surface, and the film 2 is stretched and fixed on the wooden frame.
The film was placed so that the surface was in contact with the adhesive and left at room temperature for 30 minutes. After the adhesive had hardened, the excess portion of the film 2 was cut along the outer periphery of the jig. In order for the film to withstand the temperature differences that occur when using double-glazed glass, four holes with a diameter of 1 mmφ were made in the film on the inside of the jig. Thereafter, a second glass plate to which a jig as a spacer was fixed was stacked so that the side to which the double-sided tape was attached was in contact with the film surface, and the surrounding area of the jig was sealed with a sealant (thiocol type). There were no wrinkles or slack in the film-2 in the obtained double-glazed glass, where the elongation of the film-2 was 0.02% or more. In addition, cracks were observed in the metal layer of films with elongation of 1.1% or more. The results of the examples are shown in Table 1. 【table】

[Brief explanation of drawings]

FIG. 1 is a conceptual diagram of the manufacturing method of the present invention, and FIG. 2 is a conceptual diagram of a cross section of the double-glazed glass obtained by the present invention. In the figure, the numbers represent the following contents. 1, 1′...Glass plate, 2...Functional film,
3...Jig, 4,4'...Adhesive, 5...Sealant, 6...Wooden frame, 7...Spring.

Claims (1)

[Claims] 1 Functional film 0.02% to 1.0% in two axial directions
A step of stretching, a step of fixing the functional film to a jig previously fixed to the first glass plate while maintaining the stretched state within the above range, and then placing the second glass plate oppositely, 1. A method for manufacturing double-glazed glass containing a stretched functional film, the method comprising the step of sealing the periphery.