JPH0986973A - Double-layered glass - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a glass plate from being cracked or broken in a cold region by specifically setting a specific relation between the layer thickness of the inner space between the double-layered glasses and the thickness of the lattice ribs arranged in the inner space. SOLUTION: Spacer 3 is arranged on the periphery of a couple of opposing glass plates 2, 2 and they are tightly sealed into an integrated body by applying an adhesive sealing agent to both peripheries of the inner surfaces of the opposing glass plates and the outer wall surfaces of the spacers 3 and hard lattice ribs 5 are placed in the inner space 5. The thickness Ti of the lattice ribs 5 is set to Ti <=To ×0.9 where To is the layer thickness of the inner space of the double-layered glass and the lattice ribs are arranged to the middle part of the layer thickness of the inner space 4 and kept apart from both glass plates 2, 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multi-layer glass having a hard lattice-like inclusion in its inner space, and in the case where the glass plate is bent and pressed against the lattice-like inclusion due to changes in the external environment. In regard to the double glazing, the damage of the glass plate is suppressed as much as possible.

[0002]

2. Description of the Related Art It is known to dispose a hard lattice-like inclusion in the inner space of a double glazing, which brings advantages such as providing decorativeness and preventing invasion from the outside.

At the time of assembling the double glazing, the
It is manufactured by arranging a spacer and a grid-shaped inclusion incorporated between both glass plates under atmospheric pressure (about 20 ° C.) and atmospheric pressure (approximately 1 atm), and adhering and integrating them with an adhesive sealant. Conventionally, the lattice-like inclusions also have a thickness close to that of the layer thickness of the internal space, and therefore the lattice-like inclusions are arranged so as to be in contact with both glass plate surfaces.

The double glazing produced in this way is
Usually, it can be stably used for a long period of time as long as it is used under an environment of around normal temperature and normal pressure.

[0005]

In Japan, the demand for double glazing including double glazing having lattice-like inclusions is increasing in Northeast Japan. However, the double glazing having the lattice-like inclusions causes a significant shrinkage of the internal space when it is cold in a cold region or when wind pressure is further applied or under similar environmental conditions, and the glass plate and the lattice-like inclusions are present. When an object is strongly pressed, a phenomenon in which cracks and breakage of the glass plate frequently occur starting from the contact portion between the glass plate and the lattice-like inclusions is often seen. This is an extremely high rate of occurrence compared with double glazing that does not employ lattice inclusions.

That is, the outside air temperature reaches −40 ° C. to −50 ° C. in a severely cold region, but the temperature inside the building is 10 ° C.
Even if the temperature is kept above ℃, the temperature of the inner space of the double glazing should be about the intermediate temperature between them, that is, around -20 ℃, so the atmospheric pressure of the inner space should be the absolute temperature 253 according to Boyle-Charles' law. ° / 293 ° = around 0.86 atm, and the glass plate bends toward the internal space accordingly. That is,
Since the vertical and horizontal lengths and widths of the double glazing itself are almost constant against temperature changes, in order to relax the internal and external atmospheric pressure difference and obtain a state close to equilibrium, in the above case the thickness (layer thickness of the internal space) Bend the glass plate inward to bring the average thickness to 0.86 with respect to the original thickness.

However, when the grid-like inclusions are normally inscribed in the glass plate as in the conventional case, the grid-like inclusions suppress the force of the glass plate to bend strongly under reduced pressure, and the grid-like inclusions are in a pressure contact state. It is presumed that stress concentration occurs in the contact portion of the glass plate and the vicinity thereof, and a crack is generated from the contact portion, resulting in high damage.

The present invention provides an improved double glazing which overcomes the problems of the prior art that cracks and breakage easily occur in the glass plate under severe environments.

[0009]

That is, according to the present invention, a spacer is arranged at the peripheral edge portions of the facing surfaces of a pair of glass plates facing each other, and the glass plate opposing surface peripheral edges and the outer wall surfaces of the spacers are sealed with an adhesive sealant to be integrated. In the multi-layer glass in which the hard lattice-like inclusions are contained in the inner space formed by them, the thickness Ti of the lattice-like inclusions is Ti ≦ To × with respect to the layer thickness To of the inner space of the multi-layer glass. 0.9 and
In addition, the grid-shaped inclusions are arranged in the central portion with respect to the thickness of the internal space layer.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the accompanying drawings. FIG. 1 is a front view of a double glazing having a lattice-like inclusion common to the conventional example and the example of the present invention. 1 is a double glazing, 2, 2 are both glass plates, 3 is a spacer, and a spacer 3 Since a desiccant is contained in the inner space and a hole (not shown) communicating with the inner space 4 is formed in the spacer 3, the atmosphere of the inner space is maintained in a dry state and inconvenience such as dew condensation is prevented.

As the glass plate, transparent, non-colored or colored soda lime glass is usually used, but the glass plate is not limited to this. The standard thickness of the glass plate is 3 mm, and 3
A wide range of mm to 5 mm is often used. As the thickness deviates from the above range, the weight increases and handling workability becomes difficult. It should be noted that those having the above thickness range have no problem under an environment near room temperature and normal pressure, but the glass plate itself is easily bent under the severe environment as described above. The size, width or length of the glass plate is around 500mm to around 1500mm, usually 1000mm
□, or 1000 mm × 1500 mm is often used.
The standard thickness of the inner space layer of the double glazing is about 6 mm to 12 mm, and the thickness of about 4 mm to 12 mm is widely adopted.

In the internal space 4, lattice-like inclusions, in the figure, lattices 5 (5 'in the conventional example) running in the vertical and horizontal directions are arranged.
Further, the lattice 5 (5 ') is composed of a rectangular tube portion 6 (6') and an intersection joint 7 (7 '). Incidentally, in the conventional example, the lattice 5'is almost in contact with both glass plates 2 and 2, whereas in the example of the present invention, the lattice 5 is made thinner than the layer thickness of the internal space, and It is placed in the center and separated from both glass plates 2 and 2.

Although the material of the lattice-like inclusions is not specified, an acrylonitrile-styrene-butadiene rubber or a similar copolymer having excellent rigidity and durability is adopted. The distance between the grids (opening) is less than 200 mm
It is appropriately adopted as about 400 mm.

FIG. 2 is a partial side sectional view (a sectional view taken along the line P--P in FIG. 1) of the conventional double glazing in a normal state, in which the glass plate 2 is bent in the spacer 3 and the lattice 5 '. Touch without contact. Note that the thickness ti of the lattice 5'is almost equal to the thickness of the spacer 3, that is, the layer thickness to of the internal space, that is, a relation of to≈ti. FIG. 3 corresponds to FIG. 2, and is a partial side cross-sectional view of a conventional example of double glazing in a cold state, that is, in a state where the internal space 4 is under reduced pressure, and the glass plate 2 is bent inward. , Is restrained by the lattice 5 ′ and, if schematically shown, has a corrugated shape as illustrated. In this case, it can be easily inferred that a concentrated stress is generated in the portion of the glass plate 2 that is in pressure contact with the lattice 5 ', as shown by an arrow Z, and a local crack is likely to occur.

FIG. 4 is a partial side sectional view of the double glazing of the present invention.
(Cross-sectional view taken along the line P-P in FIG. 1) and the spacer 3
The thickness ti of the lattice 5 is thin with respect to the thickness to, and the glass plate 2 is in a floating state as indicated by the alternate long and short dash line. On the other hand, when it is cold, that is, when the internal space 4 is under reduced pressure, the glass plate 2 bends and comes into contact with the lattice 5 as shown by the solid line, but the mutual pressing force is weak, so the restraining force by the lattice 5 is low, Since the generated concentrated stress is also low, the occurrence of cracks can be suppressed.

The susceptibility of the glass plate to cracks varies depending on various conditions, but within each range such as the size range of the glass plate, the thickness range, the inner space layer thickness range of the double glazing, and the lattice opening range. If the lattice thickness is ≦ to × 0.9 with respect to the internal space layer thickness to, cracks can be significantly suppressed.

FIG. 5A is a side cross-sectional view of the intersection joint 7 according to the present invention. The joint 7 has button-like protrusions 9 which can be projected and retracted on one side and the other side (upper and lower sides in the drawing), respectively.
9'is arranged, and when the glass plate is normally floated, the button-shaped projections 9 and 9'are gently contacted with the glass plates 2 and 2, respectively. That is, when the glass plate is normally in a floating state, if the glass plate and the grid come into contact with each other due to some external impact, a contact sound is generated and annoying, but such a contact sound is generated due to the arrangement of the button-like protrusions. Suppress. Alternatively, when the glass plate and the grid are in strong contact with each other, a crack may occur in the glass plate, but if a button-shaped protrusion is provided, the generation of the crack can be suppressed by the buffering action of the button-shaped protrusion.

In the figure, the intersection joint 7 has a joint member 8 on one side (upper side in the drawing) and a joint member 8'on the other side (lower side in the drawing), which are fitted to each other by a projection 10 and a fitting hole 11. , Can be integrated. Each of the joint members 8 and 8'has button-like projections 9 and 9'removably arranged in the respective holes as described above, and an elastic spring is provided in the hollow portion formed by the joint members 8 and 8 '.
By arranging 12, the button-like projections 9 and 9'are made to act in such a direction as to always project.

Further, one joint member 8 and the other joint member
8'has insert pieces 13 and 13 'on the sides to be in contact with the rectangular tube portion 6, respectively, and these are inserted into the cylindrical body of the rectangular tube portion 6 to form an integrated lattice.

FIG. 5B is a cross-sectional view showing the relationship between the rectangular tube portion 6 and the intersection joint, that is, the insertion pieces 13 and 13 'of the joint member, as an example. A partition is provided, and the insertion pieces 13 and 13 'of the joint member are arranged in a pair on the left and right, and are fitted into each other. The partition of the square tube portion has a function to reinforce the square tube portion and imparts robustness. Further, since the pair of insertion pieces are inserted, the fitting force between the rectangular tube portion and the insertion piece is also increased.

FIG. 6 is a side sectional view of a double glazing showing another embodiment of the present invention. The lattice 5 has the same thickness as the spacer 3 in the vicinity of the spacer 3, and the thickness is gradually reduced to the center of the double glazing. It is the thinnest part in the portion Y, and it is also within the scope of the present invention to provide the lattice 5 with a thickness deviation in accordance with the expected bending of the glass plate 2.

FIG. 7 is a plan view exemplifying another lattice-shaped inclusion, and the lattice-shaped inclusions 5a and 5b can be of various shapes as shown in the drawing and not limited to the drawings. It is a category.

[0023]

[Example] A glass plate having a size of 1050 mm x 1050 mm and a thickness of about 3 mm was prepared. In the example, a spacer having a thickness of 12 mm, 10.6 mm was used.
mm thickness grating (ti / to = 0.88), 12 in Comparative Example 1
11.3 mm thick grid for mm thick spacer (ti / to = 0.
94), in Comparative Example 2, a 12 mm thick spacer,
12mm thick grids (ti / to = 1.0) were adopted respectively, and both had spacers and grids built in between the glass plates, and these were assembled and bonded together at 20 ° C.
A multi-layer glass as shown in Fig. 3 was completed.

A well-known strain gauge was attached to an appropriate place of this double glazing, the whole was kept at −20 ° C. in a freezer, the strain generated on the glass plate surface at that time was measured, and bending was performed based on the strain. The stress was calculated. Strain (stress) measurement site is shown in Figure 1A, B, C
3 points, and the measurement results are shown in Table 1.

[0025]

[Table 1]Compared to Comparative Examples 1 and 2, the stress values generated in the Examples are more remarkable.
It is very small and the frequency of cracks and damages is extremely reduced.
Less. That is, normal soda-lime glass plate (flow
Frosted glass) has an average breaking bending stress of 3 mm to 5 mm.
500 Kg / cm ²However, the breaking bending stress of the glass plate is
If the variation is large and long-term stress generation is taken into consideration,
Allowable bending stress value is 100 kg / cm²It is. In the example
Is below the permissible bending stress value, while in Comparative Examples 1 and 2,
The damage probability exceeds the permissible bending stress value and the damage probability is extremely high.
I understand the threshold.

[0026]

According to the present invention, local stress concentration can be markedly reduced and cracks generated in a glass plate can be significantly reduced.

[Brief description of drawings]

FIG. 1 is a front view of a double glazing having lattice-like inclusions common to a conventional example and an example of the present invention.

FIG. 2 is a partial side sectional view (a sectional view taken along line P-P in FIG. 1) of a conventional double glazing in a normal state.

FIG. 3 is a partial side sectional view of a conventional example of double glazing corresponding to FIG. 2, in a cold state, that is, in a state where the internal space 4 is under reduced pressure.

FIG. 4 is a partial side sectional view of the double glazing of the present invention (P in FIG. 1).
-P line sectional view).

FIG. 5A is a side sectional view of an intersection joint according to the present invention, and FIG. 5B is a sectional view showing the relationship between a rectangular tube portion and the intersection joint as an example.

FIG. 6 is a side sectional view of a double glazing showing another embodiment of the present invention.

FIG. 7 is a plan view illustrating another lattice-shaped inclusion.

[Explanation of symbols]

 1 -------- Multi-layer glass 2, 2 ---- Glass plate 3 ------- Spacer 4 ------- Internal space 5,5 '---- Lattice 6, 6 '---- Square tube 7, 7' ---- Intersection joint

Claims (1)

[Claims] 1. An inner space formed by arranging spacers at peripheral edges of facing surfaces of a pair of glass plates facing each other, sealing them together with an adhesive sealant over the peripheral edges of the facing surfaces of the glass plates and the outer wall surfaces of the spacers. In a double-layer glass having a hard lattice-like inclusion therein, the thickness Ti of the lattice-like inclusion is Ti with respect to the layer thickness To of the internal space of the double-layer glass.
A glazing characterized in that ≦ To × 0.9 and a lattice-like inclusion is arranged in the central portion of the inner space layer with respect to the thickness thereof.