JP3255548B2 - Double glazing - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a double glazing. More particularly, the present invention relates to a double glazing having a small space portion and a small overall thickness. Although the double glazing according to the present invention has a high heat insulating property despite its small thickness, it has an energy saving effect and has windows and windows of buildings and trains, and doors and windows of showcases for storing and displaying food and drinks, such as frozen showcases or refrigerators. Available for showcase. Furthermore, it can also be used for openings that require heat insulation and transparency.

[0002]

2. Description of the Related Art In recent years, effective use of energy resources has attracted attention, and double-glazing has also attracted attention as one of energy-saving measures in buildings, heat insulation, cold insulation containers and the like. In the currently manufactured double glazing, the space defined by the glass plate is sealed with a sealant, and the sealed space is filled with dry air or kept dry using a desiccant such as silica gel. Is configured.

Recently, it has been proposed to use a combination of a double-glazed glass and a transparent heat-insulating film in order to improve the energy-saving effect of the double-glazed glass. On the other hand, the interval (thickness) of the space of the multilayer glass is usually 6 mm or more, and the thickness of one piece of glass is generally about 3 mm, so that the thickness of the entire multilayer glass is at least 12 mm.

[0004]

The double glazing is usually used in a form inserted into a sash frame. For example, in the door of a refrigerated / frozen showcase for storing foods and drinks, it is required to reduce the thickness of the door to increase the storage capacity as much as possible. Also, when the thickness of the double glazing is large, the weight of the entire door including the sash frame is increased. Accordingly, efforts have been made to reduce the thickness of the double glazing and to reduce the overall weight.
As one of them, a glass having a thickness of 2.7 mm has recently been used, but this is said to be the limit of the thickness of the glass in terms of mechanical strength.

[0005] On the other hand, reducing the space interval requires at least the 6 mm interval as described above from the viewpoint of lowering the heat insulation function and the structure of the spacer for maintaining the interval. As shown in FIG. 2, the spacer used in the conventional structure has a space for holding the desiccant therein and keeps the gap between the two glasses at a constant width. And a slit having a slit through which air can flow on the sealed space side has been used. However, as long as a spacer having such a cross-sectional shape is used, it has been difficult to reduce the glass interval to 6 mm or less.

[0006]

Means for Solving the Problems The present inventors have conducted various studies on the structure of the spacer of the double glazing, and as a result,
It has been found that a spacer having a gutter-like (U-shaped), concave or similar structure can reduce the thickness of one of the spacer materials and can maintain a space for storing a desiccant. did.

According to the present invention, at least two glass plates, a spacer for holding a space between the two glass plates, a double-layer glass formed of a desiccant and a sealant housed inside the spacers (I) the spacer is formed of a plate-like molded body and
The distance between the openings of the spacer is larger than the height of the spacer
Ku, (ii) spacer when installed between glass plates, whereas <br/> substantially linear or point contact with and the other on the glass surface of the
The glass surface is in surface contact, (iii) a spacer having a shape capable of accommodating a desiccant therein, the and desiccant arranged inside the spacer contact
And (iv) the spacer has a communicating portion through which a gas can flow with a space between the inside and the two glass plates , and (iv) the double-glazed glass is provided. Is done.

Hereinafter, the double glazing of the present invention will be described in more detail.

When the spacer in the double-glazed glass of the present invention is installed between two glass plates , one of the glass surfaces is substantially in line contact or point contact with the other glass plate.
The surface is in surface contact . This contact state will be described with reference to FIGS. FIG. 1 shows an example of a cross-sectional structure around a double glazing of the present invention. In FIG. 1, a space is formed between two glass plates 2 and 2 ′ by a spacer 1. The spacer 1 is in line contact with one glass plate 2 and is in surface contact with the other glass plate 2 '. In the case of FIG. 1, the glass plate 2 and the spacer 1
Is a right end portion of the spacer 1 in the drawing, and has a structure in which the spacer 1 is in contact via the double-sided adhesive tape 5.
This double-sided adhesive tape 5 is used for facilitating the assembling process of the double-glazed glass and improving the sealing property, and is not always necessary.

In FIG. 1, the spacer 1 is in contact with the glass plate 2 ′ on the surface, and is connected via a double-sided adhesive tape 6. This double-sided adhesive tape 6 is used for fixing the spacer 1 at a predetermined position on the glass plate when assembling a double-layer glass, and also has a sealing effect. That is, the double-sided adhesive tape 6 is pasted to a position where the spacer 1 of the glass plate is to be fixed, and the spacer 1 is pasted thereon, so that the spacer 1 can be easily fixed at a predetermined position.

In FIG. 1, a spacer 1 has a function of being fixed between two glass plates so as to fix and maintain a constant interval between the two glasses and to form a space 7 for storing a desiccant. ing. This space 7
A space is required to accommodate the desiccant particles and to have a spacing such that the particles are not comminuted by the glass plate, and to accommodate the required amount of desiccant. Although the desiccant particles are not shown in the space 7 of FIG. 1, the desiccant particles are generally formed in a space formed between the two glass plates of the space 7 (more precisely, a thickness obtained by subtracting the thickness of the spacer). Those having a smaller particle size are suitable. Specifically, the average particle size of the desiccant is in the range of 1 to 4 mm, preferably 1 to 3.5 mm. If the particle size of the desiccant is smaller than the above range, the process of filling the desiccant into the spacer 7 is not only troublesome, but also the desiccant leaks to the outside of the spacer 1 (space portion of the glass plate). Not desirable. On the other hand, when the desiccant particles are larger than the above range, not only does it need to increase the interval formed by the spacers, but also there is a possibility that the desiccant particles stored in the space 7 may be crushed by the two glass plates. Is not desirable. As the desiccant, for example, molecular sieve, silica gel, calcium carbonate and the like can be used.

The double-sided adhesive tape 4 applied to the inside of the spacer 1 in FIG. 1 is used in the double-glazed glass of the present invention in terms of its assembling workability, filling of a desiccant and maintaining the performance of the double-glazed glass thus assembled. It is performing extremely excellent functions. That is, in the double glazing of the present invention, a thin spacer having a specific shape is used to reduce the total thickness thereof, and therefore, the space 7 formed by the spacer is used.
Are small and the spacer itself has an open shape. Therefore, it is extremely difficult to sufficiently store the desiccant particles in the space 7. However, the double-sided adhesive tape 4 is applied to the surface of the spacer used in the present invention that forms the space 7 (that is, the opposite surface of the spacer that makes surface contact with one glass plate).
When the spacer 1 to which the obtained double-sided adhesive tape 4 is attached is brought into contact with desiccant particles, the desiccant particles are uniformly attached to the surface of the double-sided adhesive tape 4 inside the spacer 1. become. The method of filling and attaching the desiccant particles to the inside of the spacer is extremely simple, and it is possible to attach a large amount of the desiccant particles in a planar manner.

Thus, the spacer having the desiccant particles adhered to the inside in the form of a sheet may be fixed to the surface of the glass plate via the double-sided adhesive tape 6, and another glass plate may be placed thereon. The double-sided adhesive tape 4 stuck on the inside of the spacer in this manner facilitates the workability of assembling the thin double-glazed glass of the present invention and storing the desiccant by using it. It is.

Therefore, the double-sided adhesive tape 4 shown in FIG. 1 provided inside the spacer of the present invention does not necessarily need to be a tape, but may be another tape as long as it has the same function. That is, a thin layer of an adhesive may be formed inside the spacer. On the other hand, the double-sided adhesive tape 5 of FIG. 1 can be interposed at a portion where the spacer 1 and the glass plate 2 are bonded by a line or a point as described above, but preferably, as shown in FIG. Can be extended to use. By doing so, the desiccant particles housed in the space 7 are fixed at predetermined locations by the adhesive function, and the movement of the desiccant together with the double-sided adhesive tape 4 can be prevented by the vibration of the double-layer glass.

The shape of the spacer of the present invention is a plate-like molded body, and the interval between the open portions of the spacer is set to be equal to that of the spacer.
If installed between two glass plates larger than the height ,
On one of the glass surfaces is of structure substantially linear or point contact, preferably of the other glass surface to surface contact. The thickness of such a spacer is usually 0.1.
The thickness is suitably 3 to 0.7 mm, preferably 0.4 to 0.6 mm, but this thickness can be slightly changed depending on the material and shape, and the thickness does not necessarily need to be uniform. As a material of the spacer, a metal (for example, aluminum,
Stainless steel) or resin. In the case of a metal, it can be formed into a desired shape by a roll forming method or a pressing method.

The cross-sectional shape of the spacer may be the shape shown in FIG. 1, or may be the cross-sectional shape shown in FIGS. The spacer has a closed space formed between the two glass plates and a communication passage through which gas can flow. For example, in the case of the spacer 1 of FIG.
As in (1) and (4), the left end of the spacer is not in contact with the glass plate 2 and is spaced at a small interval. This interval (d ₁ ) only needs to allow gas to flow, and should be an interval at which desiccant particles cannot pass. In addition, the communication passage is formed in the spacer by a small hole (d) as shown in (2) and (3) of FIG.
₂ ) may be provided. Fig. 3-
As in (5), the end on the closed space side may be in point contact with the glass plate, or a slight gap may exist as long as the end is sealed, and the glass may have a partially saw-like surface. The structure which contacts a board may be sufficient. As previously mentioned,
The communication passage through which the gas flows needs to have a size that does not allow the desiccant particles to pass through.

In the double glazing of the present invention, a spacer and a desiccant are arranged between two glass plates as described above, and the internal gas is kept in a dry state by a sealing agent usually used in the double glazing. I do. Sealant is applied on the outside of the spacer as commonly used.
It is filled between two glass plates and is shown as a sealant 3 in FIG. As the sealant, those commonly used for double-glazing can be used. Representative examples of the sealant include poly (isobutylene) -based, polysulfide-based, silicone-based, and polyurethane-based sealants. These are preferred because they have a low water vapor transmission rate, maintain an adhesive force for a long time, and have excellent followability in the tensile direction.

In the double-glazed glass of the present invention, it is preferable that a transparent heating element is mounted inside a single-sided glass plate, whereby dew condensation can be prevented or suppressed. As a method of mounting the transparent surface heating element inside the glass plate, a means known per se in the case of a double glazing can be used. For example, a method of forming a coating of a tin or indium oxide, a metal of gold or silver or an alloy thereof directly on the surface of a glass plate by a sputtering method or a sintering method, or a film on which the coating is formed May be attached to a glass plate. When a transparent surface heating element is mounted, electrodes made of silver or gold are attached to both ends of the surface, and in use, a voltage is applied to heat the surface to prevent dew condensation.

Further, the heat insulating function of the double-glazed glass can be further enhanced by mounting a transparent heat-insulating film inside the glass plate on one side of the double-glazed glass of the present invention. That is, since the double-glazed glass of the present invention has a small thickness in the space, the mounting of the transparent heat-insulating film is very effective to compensate for the lack of the cross-sectional effect. The transparent heat-insulating film itself is commercially available, and can be used as it is.

The double glazing of the present invention can be advantageously used in a wide range of fields since it has a small overall thickness and has a heat insulating effect and a dew condensation preventing effect. In particular, in the case of a refrigerated / frozen showcase using this double-glazed glass as a window, the storage capacity can be increased and the window can be easily opened and closed, so that it is extremely convenient.

[0021]

EXAMPLES Examples of the double glazing of the present invention will be shown below, but these are merely for explanation, and the present invention is not limited to these.

Example 1 Using two glass plates (500 mm in width, 800 mm in length, and 2.7 mm in thickness), a double glazing having the cross section at the end shown in FIG. 1 was prepared. Spacer 1 is 0.4mm thick
The cross-sectional dimensions were obtained by the roll forming method from the aluminum plate of No. 1 and H = 1.7 mm, L = 5 mm, W = 6.5 mm, and Q =
39 ° and d ₁ = 0.15 mm. Each of the double-sided adhesive tapes 4, 5 and 6 in FIG. 1 has a thickness of 150 μm.
In the desiccant storage space 7, particles of molecular sieve A-4 (manufactured by Union Showa Co., Ltd .; average particle size: about 1.5 mm) are stored as a desiccant in a state of being adhered to the double-sided adhesive tape 4. However, the desiccant is not shown in FIG.

The four corners of the spacer at the four corners of the double-glazed glass are fixed by nylon joints (jigs), but are not shown in FIG. Further, the outside of the spacers on the four sides of the multilayer glass is sealed with a combination of a sealant [Hamaite PRC428Y (manufactured by Yokohama Rubber Co., Ltd.)] and a primer to shut off the air and the outside air in the multilayer glass. The total thickness of the glass is 7.4 mm,
The thickness of the air layer was 2 mm.

Example 2 In the double-glazed glass of Example 1, a transparent heat insulating film [Reftel ZA] was placed inside one of the two glass plates.
05G; manufactured by Teijin Limited] in the same manner as in Example 1 except that a spacer having the same shape, a desiccant, a double-sided adhesive tape, and a sealant were used to form an air layer having a thickness of 2 mm and a total thickness of 7.4 mm. A double glazing was made.

Comparative Example A double glazing was prepared in the same manner as in Example 1 except that a square-shaped spacer having a cross section shown in FIG. 2 was used instead of the spacer 1. Air layer thickness 6mm,
The total thickness was 11.4 mm.

Example 3 In the double glazing of Example 1, a transparent heat insulating film [Reftel ZA] was placed inside one of the two glass plates.
-05TH; manufactured by Teijin Limited], and Ag-paste [RL-10; manufactured by Daita Metal Foil & Powder Co., Ltd.] is applied to the upper and lower edges of the upper and lower short sides (horizontal sides) of the film. Width 7
mm electrode was provided to produce a double-glazed glass.

Example 4 Insulating gas (S) was placed in the closed space inside the double-glazed glass of Example 1.
F ₆ ) was enclosed to prepare a double-glazed glass.

Example 5 A 2 mm thick vinyl chloride grid (# type) was placed in the space inside the double glass of Example 1 to prepare a double glass.

As described above, the double glazings prepared in Examples 1 to 5 and Comparative Example were set in a refrigerated showcase set at room temperature of 20 ° C. and 0 ° C. in the refrigerator, and the dew condensation on the glass surface inside the room was observed. The results obtained are shown in Table 1 below. Example 3
In the case of the double glazing prepared in the above, the applied voltage to the surface heat generating layer was 23V.

[0030]

[Table 1]

[0031]

The heat insulating double glazing of the present invention is a double glazing in which the distance between the glasses is small and the overall thickness is small.
The glass spacing is 1.7-5mm, preferably 2-4m
m, the overall thickness is 7.1 to 11 mm, which is very thin as compared with the conventional product. Further, although the double glazing of the present invention is thin, it is easy to make and assemble it. Therefore, the double glazing of the present invention is excellent not only in production as heat insulating glass but also in terms of convenience.

[Brief description of the drawings]

FIG. 1 shows an example of a cross-sectional structure around a double glazing of the present invention.

FIG. 2 shows a cross-sectional structure around a conventional double-glazing unit.

FIG. 3 schematically shows a cross-sectional shape of a spacer used for the double-glazed glass of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Spacer 2 Glass plate 2 'glass plate 3 Sealant 4 Double-sided adhesive tape 5 Double-sided adhesive tape 6 Double-sided adhesive tape 7 Desiccant storage space 8 Desiccant

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-2-289451 (JP, A) JP-A-59-21551 (JP, A) JP-A-51-146516 (JP, A) 54747 (JP, U) Japanese Utility Model Showa 61-181489 (JP, U) Japanese Utility Model Showa 60-165438 (JP, U) Japanese Utility Model Showa 59-80426 (JP, U) (58) Field surveyed (Int. ⁷ , DB name) C03C 27/06 101

Claims (8)

(57) [Claims] 1. A double-layer glass formed of at least two glass plates, a spacer for holding a space between the two glass plates, a desiccant and a sealing agent contained in the spacer, (i) The spacer is formed from a plate-like molded body, and
The distance between the openings of the spacer is larger than the height of the spacer
Ku, (ii) if spacer was placed between glass plates, substantially linear or point contact with and the other gas in one of the glass surface
The Las surface to surface contact, (iii) a spacer having a shape capable of accommodating a desiccant therein, and desiccant arranged inside the spacer contact
(Iv) The double-layer glass is housed by being adhered to the adhesion layer, and (iv) the spacer has a communication path through which a gas can flow with a space between the inside of the spacer and the two glass plates. 2. The double-glazed glass according to claim 1, wherein a transparent surface heating element is mounted inside the glass plate on one side. 3. The double-glazed glass according to claim 1, wherein a transparent heat-insulating film is provided inside at least one side of the glass plate. 4. The double-glazed glass according to claim 1, wherein the spacer is joined by an adhesive tape at a portion in contact with one or both glass plates. 5. The double glazing according to claim 1, wherein the thickness of the space between the two glass plates is 1.7 to 5 mm. 6. The double-glazed glass according to claim 1, wherein a heat insulating gas is sealed in a space between the two glass plates. 7. The double-glazed glass according to claim 1, wherein a lattice is provided in a space between the two glass plates. 8. A refrigerated / frozen showcase using the double-glazed glass according to claim 1 as a door or a window.