JP2001058852A - Glass panel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a glass panel so designed as to maximally avoid the direct action of an impact force on the interface between an adhesive layer and glass through mitigating it even if it acts on a cap, so as to enable a suction port closure to be protected as desired through preventing the cap from peeling off. SOLUTION: This glass panel is so designed that, a pair of plate glasses 1A and 1B are spacedly disposed in the thickness direction and the space V between them is closed at reduced pressures, and a suction port closure 7 after the space V is depressurized is set up projectedly on the surface of one of the plate glasses 1A, 1B, a cap 8 for protecting the suction port closure 1 covers the closure 1 in such a condition as to have a space S between it and the closure 8 and adheres to one of the plate glasses via an elastic adhesive layer 9.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a glass panel body in which a pair of glass sheets are arranged at intervals in a thickness direction, and a gap between the pair of glass sheets is hermetically sealed and depressurized. A suction port closing part after depressurizing the gap part is provided on one of the pair of glass sheets in a protruding state on the surface of the plate glass, and a cap for protecting the suction port closing part is provided. The present invention relates to a glass panel which covers the suction port closing portion with a gap between the suction port closing portion and the glass panel and is adhered to the one plate glass.

[0002]

2. Description of the Related Art In a glass panel having such a structure, the suction port closing portion after depressurizing a gap between a pair of glass sheets projects from the surface of the glass sheet. A cap for prevention is provided, and the cap is adhered to the glass sheet so as to cover the suction port closing portion. As an adhesive for bonding the cap and the plate glass, an epoxy-based two-liquid curing type adhesive has conventionally been frequently used.

[0003]

The epoxy-based two-part curable adhesive, which has been widely used, has a short curing time, is excellent in weather resistance, and has an adhesive strength against a force acting slowly. It has the advantage of being very strong,
On the other hand, it is weak against impact force, and therefore has the following disadvantages.

[0004] That is, it is extremely rare that a force acting slowly is applied to the cap adhered to the plate glass, but rather an instantaneous impact is more often applied when cleaning the glass. . However, the epoxy two-part curable adhesive has poor flexibility after curing. Therefore, when an impact force acts on the cap, the impact force is directly and instantaneously applied to the interface between the adhesive layer and the glass. There is a drawback in that the cap is peeled off from the interface between the adhesive layer and the glass, and even the closed portion of the suction port to be protected is damaged.

The present invention has been made to overcome the above-mentioned drawbacks. It is an object of the present invention to reduce the impact force even when an impact force acts on the cap and to reduce the impact force between the adhesive layer and the glass interface. It is an object of the present invention to provide a glass panel which can prevent the cap from peeling off as much as possible and protect the suction port closing portion as desired.

[0006]

[Means for Solving the Problems] The feature of the invention according to claim 1 is that, as illustrated in FIGS. 2 and 3, a pair of plate glasses 1A and 1B are arranged at intervals in the thickness direction. At the same time, a glass panel main body P in which a gap V between the pair of plate glasses 1A and 1B is hermetically sealed and decompressed is provided.
A cap 8 is provided on one of the pair of plate glasses 1A and 1B so as to protrude from the surface of the plate glass and protects the suction port closing portion 7.
Is a glass panel P adhered to the one sheet glass 1A so as to cover the suction port closing portion 7 with a gap S between the suction port closing portion 7 and the cap 8
Are bonded to the one glass plate 1A via the elastic bonding layer 9.

As shown in FIG. 3, the elastic adhesive layer 9 has an elastic sheet 10 and the elastic sheet 10 and the cap 8 are
The elastic sheet 10 and the one glass sheet 1A are bonded to each other by a second bonding layer 12 while being bonded to each other by a first bonding layer 11.

The feature of the invention according to claim 3 is that, as illustrated in FIG. 3, the elastic adhesive layer 9 is
Of the first adhesive layer 11 and the second adhesive layer 12 are coated with an adhesive tape.

Note that, as described above, reference numerals are provided for convenience of comparison with the drawings, but the present invention is not limited to the configuration of the accompanying drawings by the entry.

According to the first aspect of the present invention, the cap for protecting the closed portion of the suction port is adhered to the plate glass via the elastic adhesive layer, so that it is possible to clean the glass when cleaning. In such a case, even if an impact force acts instantaneously on the cap, the impact force is alleviated by the elastic deformation of the elastic adhesive layer, thereby avoiding direct action on the interface between the adhesive layer and the glass. Therefore, even if an impact force acts on the cap, the cap is prevented from peeling off from the interface between the adhesive layer and the glass as much as possible, and the suction port closing portion can be protected as desired.

According to the characteristic configuration of the second aspect of the present invention, the elastic adhesive layer includes an elastic sheet, and the elastic sheet and the cap are bonded to each other by the first adhesive layer. Even if there is some unevenness on the adhesive surface of the cap, by pressing the adhesive surface of the cap against the elastic sheet to elastically deform the elastic sheet, the first adhesive layer can enter the concave portion of the cap adhesive surface, The entire surface of the cap bonding surface can be securely bonded to the elastic sheet. Since the elastic sheet and the sheet glass are also bonded to each other by the second adhesive layer, the same applies between the elastic sheet and the sheet glass. Even if the adhesion surface of the sheet glass has fine irregularities, the elastic sheet is elastically deformed. Thereby, the second adhesive layer can be penetrated into the concave portion of the plate glass bonding surface to be bonded, and as a result, the plate glass and the cap are bonded by the first and second adhesive layers with the elastic sheet interposed therebetween. Reliable bonding over the entire surface is possible.

According to a third feature of the present invention, the elastic adhesive layer is formed of an adhesive tape having both sides of an elastic sheet coated with an adhesive as a first adhesive layer and a second adhesive layer. Therefore, the operation of bonding the cap to the plate glass is simple and easy, the workability can be improved, and the bonding of the cap can be finished beautifully. That is, although it is possible to use an adhesive having high fluidity as the first adhesive layer and the second adhesive layer, it is difficult to adjust the amount of the adhesive applied to both surfaces of the elastic sheet. If the amount is too small, the adhesive strength will be reduced.If the amount is too large, the adhesive will flow out or inside the cap, and if it flows out of the cap and hardens, it will impair the finished appearance and flow out inside. When cured, the cap and the suction port closing portion may be adhered to each other, and external force acting on the cap may cause damage to the suction port closing portion. In this regard, an adhesive tape coated with an adhesive can provide a beautiful finish without unnecessary outflow of the adhesive, and can also protect the suction port blocking portion as desired.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the glass panel according to the present invention will be described with reference to the drawings. Glass panel body P
As shown in FIGS. 1 and 2, a pair of rectangular glass sheets 1A, 1B are arranged parallel to each other with an interval in the thickness direction, and between the pair of glass sheets 1A, 1B. A plurality of spacers 2 are interposed in order to keep the interval between the glass sheets 1B constant, and both glass sheets 1A, 1B
The gap V between them is hermetically sealed under reduced pressure.

Each of the pair of glass sheets 1A and 1B is a transparent float glass sheet of 3 mm according to JIS standard (substantially 2.7 to 3.3 m in consideration of thickness error).
m), one of the glass sheets 1A is slightly smaller in area than the other glass sheet 1B, and the entire periphery of the other glass sheet 1B is arranged to protrude from the entire periphery of the glass sheet 1A. Have been. Then, the protruding portion of the other plate glass 1B and the entire peripheral portion of the one plate glass 1A are sealed by a seal portion 3 made of a low-melting glass such as a solder glass.
The gap V between 1B is maintained in a sealed state.

As described above, since the entire periphery of the other sheet glass 1B protrudes from the entire periphery of the one sheet glass 1A, when forming the seal part 3, the seal part 3 is formed on the protrusion. The low-melting point glass is placed, and one of the glass sheets 1A is placed thereon, so that the formation of the seal portion 3 is easy and efficient.
The gap V between A and 1B can be reliably sealed.

The spacer 2 has a cylindrical shape made of stainless steel and has a diameter of, for example, 0.30 to 1.0.
0 mm, the height is about 0.1 to 0.5 mm, and the interval between the spacers 2 is set to about 10 to 25 mm. As described above, by forming the spacer 2 into a cylindrical shape,
The contact surface for both glass sheets 1A and 1B is circular,
It is a circular shape without corners where stress concentration is likely to occur, and is configured to prevent damage to both glass sheets 1A and 1B as much as possible.

The gap V between the two glass sheets 1A and 1B is formed in the decompression environment (1) by a method such as suction when the glass panel body P is manufactured in a vacuum environment or after the glass panel body P is manufactured. 0.0 × 10 ^-2 Torr or less)
Is formed. Specifically, as shown in an enlarged manner in FIG. 3, a suction port 4 is provided in one of the pair of glass sheets 1A and 1B, and a glass tube 5 is disposed in the suction port 4. Suction port 4
The space between the glass tube 5 and the glass tube 5 is closed by a low melting point glass 6. Then, after the gas in the gap V is sucked from the glass tube 5 to be in a sufficiently reduced pressure state, the front end opening of the glass tube 5 is closed by heating and melting, so that the gap V
Are configured to be maintained in a reduced pressure state.

In this manner, the glass tube 5 and the low-melting glass 6 whose end opening is closed constitute the suction opening closing portion 7 after the pressure in the gap V is reduced. 7 is provided on one of the glass sheets 1A so as to protrude from the glass surface. When the thickness of the glass tube 5 exceeds 1.0 mm, it takes time to self-melt when the opening at the distal end is closed, and heats the surrounding unnecessary parts. Cracks may occur in the low-melting glass 6 and the low melting point glass. Conversely, when the thickness is less than 0.1 mm, it is difficult to maintain the shape after self-melting, and the strength may be extremely reduced.
Therefore, the thickness of the glass tube 5 is 0.1 to 1.0 m.
Since about m of glass is used and there is a possibility that the glass will be damaged by contact with other objects, the entire suction port closing portion 7 including the glass tube 5 is covered with a protective cap 8.

The cap 8 is made of a synthetic resin such as ABS resin, and has a substantially frusto-conical overall shape, that is, is mainly composed of a flat upper surface 8a and a conical surface 8b.
A cylindrical surface 8c is provided so as to be continuous with the base end of the conical surface 8b, and the inclination angle of the conical surface 8b is about 45 degrees with respect to the glass surface in a side view. 8 is configured so that other objects are difficult to be caught. Then, with the cap 8 covering the suction port closing portion 7, the dimensions of the cap 8 are adjusted so that a gap S is formed between the suction port closing portion 7 and the inner upper surface and inner peripheral surface of the cap 8. It is set and adhered to one sheet glass 1A by an adhesive tape 9 which is an example of an elastic adhesive layer.

The pressure-sensitive adhesive tape 9 has an elastic sheet 10 made of a synthetic resin at an intermediate portion in the thickness direction, a first pressure-sensitive adhesive 11 as a first adhesive layer is applied to an upper surface thereof, and a lower surface thereof is provided. And a second pressure-sensitive adhesive 12 as a second adhesive layer. The adhesive surface of the cap 8 and the elastic sheet 10 are adhered to each other by a first adhesive 11, and the adhesive surface of the elastic sheet 10 and the plate glass 1 </ b> A are adhered to each other by a second adhesive 12.
In addition, as the elastic sheet 10 made of a synthetic resin, a sheet made of a highly flexible synthetic resin such as polyurethane, soft vinyl chloride, polyethylene, or polypropylene can be used. As the second adhesive 12, an acrylic adhesive having high flexibility can be used.

Thus, the cap 8 and the plate glass 1
A is bonded with the first and second pressure-sensitive adhesives 11 and 12 made of a highly flexible acrylic pressure-sensitive adhesive with the highly elastic synthetic resin elastic sheet 10 interposed therebetween. Even if an impact force acts on the cap 8, the impact force is reduced by the elastic deformation of the elastic sheet 10 and the adhesives 11 and 12, thereby avoiding direct action on the interface between the adhesive layer and the glass. You.

[Other Embodiments] (1) In the above embodiment, an example was shown in which a sheet made of a synthetic resin such as polyurethane or soft vinyl chloride was used as the elastic sheet 10. A sheet of butyl rubber, ethylene propylene rubber, silicone rubber, or the like can be used. In this case, air bubbles can be provided inside the sheet to further increase flexibility. Also, an example in which an acrylic pressure-sensitive adhesive is used as the first adhesive layer 11 and the second adhesive layer 12 has been described. However, an elastic sheet 10 having high flexibility is interposed, and an impact force is generated by elastic deformation of the elastic sheet 10. Therefore, an epoxy-based two-liquid curing type adhesive can be used as the first adhesive layer 11 and the second adhesive layer 12.

(2) In the above embodiment, the elastic sheet 10
Although the example in which the elastic adhesive layer is constituted by the adhesive tape 9 provided with is shown, the elastic adhesive layer can be constituted by something other than the adhesive tape 9. That is, it is sufficient that the adhesive layer itself has the necessary elasticity and has characteristics enough to reduce the impact force without interposing the elastic sheet 10. For example, a one-liquid or two-liquid silicone resin, Rubber-based adhesives such as nitrile-based or SBR-based, or EVA-based,
The elastic adhesive layer can also be constituted by a hot melt adhesive such as polyamide or polyester.

[0024]

EXAMPLES In order to confirm the effects of the present invention, a static shear strength test and a dynamic shear strength test (impact strength test)
Therefore, the experimental results will be described.

In the static shear strength test, as shown in FIG. 4, the tension member 13 is externally fitted to the cap 8 adhered to the glass sheet 1A, and the tension member 13 is set at 50 mm / mm.
The pull was slowly pulled at a speed of min, and the shear strength (kg) when the cap 8 was peeled was measured. As shown in FIG. 5, the dynamic shear strength test (impact strength test) uses a hammer with a hammer head H weight of 0.55 kg and an arm length L of 0.4 m with the end of the arm as the center of rotation O. An intermediate member 14 having an L-shaped cross section is brought into contact with the cap 8 which is rotatably pivoted and adhered to the glass sheet 1A.
The hammer was freely dropped while changing the inclination angle θ, and the inclination angle when the cap 8 was peeled was measured as a breaking angle θ. The test sample was bonded with an epoxy-based two-liquid curing adhesive that has been widely used (hereinafter referred to as a conventional product), and an adhesive obtained by applying an acrylic adhesive on both surfaces of a synthetic resin elastic sheet 10. It is bonded by a tape 9 (hereinafter, referred to as a product of the present invention).

FIG. 6A shows the test results of the static shear strength of the conventional product, and FIG. 6B shows the test results of the static shear strength of the product of the present invention. Conditions are temperature 5
A strength test was performed 25 times for 3 days each at a temperature of 55 ° C. and a relative humidity of 55%. FIG. 6C shows the test results of the static shear strength of the conventional product, and FIG. 6D shows the test results of the static shear strength of the product of the present invention. A strength test was performed 25 times at a temperature of 20 ° C. and a relative humidity of 55% for 2 days.

The conventional product has an average static shear strength of 12.0 kg at a curing temperature of 5 ° C. and an average of 29.6 kg at a curing temperature of 20 ° C. The product of the present invention has a static shear strength at a curing temperature of 5 ° C. Average shear strength is 12.6
at a curing temperature of 20 ° C., the average was 12.8 kg. From this result, it is understood that the conventional product is superior in static shear strength, particularly at a curing temperature of 20 ° C. However, in the conventional product, a considerable variation in the shear strength was observed at both the curing temperature of 5 ° C. and the curing temperature of 20 ° C., and the curing temperature of 5 ° C. and the curing temperature of 20 ° C.
It can be seen that there is a large difference in the shear strength between the temperature and the temperature, that is, the curing condition, and it is difficult to obtain a constant shear strength. On the other hand, in the product of the present invention, even if the overall variation is small and curing conditions are different,
It can be seen that there is no large difference in the shear strength, and it is easy to obtain a constant shear strength.

FIG. 7A shows the test results of the dynamic shear strength of the conventional product, and FIG. 7B shows the test results of the dynamic shear strength of the product of the present invention. Conditions are temperature 5
A strength test was performed 25 times for 3 days each at a temperature of 55 ° C. and a relative humidity of 55%. FIG. 7C shows the test results of the dynamic shear strength of the conventional product, and FIG. 7D shows the test results of the dynamic shear strength of the product of the present invention. The strength test was performed 20 times at a temperature of 20 ° C. and a relative humidity of 55% for 2 days.

In the conventional product, at a curing temperature of 5 ° C., the breaking angle θ is 20.0 degrees on average, and at a curing temperature of 20 ° C.,
In the present invention, at the curing temperature of 5 ° C., the breaking angle θ is 73.6 degrees on average, and the curing temperature is 20 degrees.
At 7 ° C., the average was 74.0 degrees. from this result,
Regarding dynamic shear strength, that is, impact strength, regardless of the curing temperature, the product of the present invention is far superior, and even under different curing conditions, there is not much variation. The effect can be confirmed.

[Brief description of the drawings]

FIG. 1 is a partially cutaway perspective view of a glass panel.

FIG. 2 is a cross-sectional view of a glass panel.

FIG. 3 is a sectional view of a main part of the glass panel.

FIG. 4 is an explanatory view showing a static shear strength test method.

FIG. 5 is an explanatory view showing a method of a dynamic shear strength test (impact strength test).

FIG. 6 is a graph showing the results of a static shear strength test.

FIG. 7 is a graph showing the results of a dynamic shear strength test (impact strength test).

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1A, 1B Plate glass 7 Suction port closing part 8 Cap 9 Adhesive tape as elastic adhesive layer 10 Elastic sheet 11 First adhesive layer 12 Second adhesive layer P Glass panel body S Gap V Void

Claims (3)

[Claims] 1. A glass panel main body in which a pair of plate glasses is arranged at intervals in a thickness direction, and a gap between the pair of plate glasses is hermetically sealed and decompressed.
A suction port closing portion after decompressing the gap portion is provided on one of the pair of glass sheets in a protruding state on the surface of the plate glass, and a cap for protecting the suction port closing portion is provided. A glass panel that covers the suction port blocking portion and is adhered to the one plate glass with a gap between the suction port blocking portion and the one of the glass panels via an elastic bonding layer. A glass panel bonded to a flat glass. 2. The elastic adhesive layer includes an elastic sheet, the elastic sheet and the cap are adhered to each other by a first adhesive layer, and the elastic sheet and the one sheet glass are formed by a first adhesive layer. The glass panel according to claim 1, wherein the glass panel is bonded to each other by two bonding layers. 3. The elastic adhesive layer according to claim 2, wherein the elastic adhesive layer is formed of an adhesive tape having both sides of the elastic sheet coated with an adhesive as the first adhesive layer and the second adhesive layer. Glass panel.