JPH11348169A - Heat insulating sheet for window glass - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent that a heat insulating sheet material especially provided on a window glass side is easily thermally deformed in a heat insulating sheet for window glass comprising at least two heat insulating sheet materials integrally constituted so as to have an air layer therebetween. SOLUTION: In a heat insulating sheet for window glass wherein the first sheet 2a bonded to window glass through a double-coated adhesive tape or a self-adhesive, a second sheet 3 arranged on an indoor side and a spacer sheet 4 forming an air layer between these sheets are integrally bonded, the first sheet 2a is made thicker than the second sheet 3 by 80% or more.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat insulating sheet for a window glass having an air layer in the middle.
The present invention relates to a heat insulating sheet for a windowpane in which a sheet on a windowpane side is not easily thermally deformed.

[0002]

2. Description of the Related Art In recent years, energy saving has been recommended in all fields from the viewpoint of protection of global resources. However, window glass intended for heat insulation and heat insulation of window glass can be easily implemented in ordinary households. There is a heat insulation sheet for use.

[0003] That is, window glass, which is often used in houses and offices, is cited as one of the materials having high thermal conductivity. In winter, the indoor air is cooled by the window glass, and in summer, it is cooled. Since the indoor air is warmed by the direct sunlight, extra heating and cooling energy is required.

[0004] The simplest form of a heat insulating sheet for window glass is, for example, a single resin sheet containing an ultraviolet absorbent or the like.
There is a type in which an air layer is provided between two resin sheets, and FIG. 6 is a cross-sectional view of a conventional example.

[0005] The heat insulating sheet 1 for a window glass comprises a first sheet 2 and a second sheet 3, each of which is made of a single flexible resin sheet, which are interposed with a spacer sheet 4 therebetween. It is made of one joined together by wearing.

In this case, irregularities 41 having a rectangular cross section are continuously formed on the spacer sheet 4 with regularity, and the air layers 5 are formed between the first sheet 2 and the second sheet 3 by the irregularities 41. Is formed. The first sheet 2, the second sheet 3, and the spacer sheet 4 are all made of the same material and the same thickness.

[0007]

The heat insulating sheet 1 for a window glass is attached, for example, with a double-sided adhesive tape (not shown) along each side of the first sheet 2 (or with an adhesive applied thereto), and the double-sided adhesive tape is interposed. It is attached to the window glass 6 with the following problems.

That is, the first sheet 2 on the side of the window glass 6
Since the difference between the temperature and the temperature is larger than that of the spacer sheet 4 and the second sheet 3, the thermal expansion and contraction are greatly increased accordingly.

For this reason, as shown in FIG. 7, a gap G is generated between the first sheet 2 and the window glass 6 at the time of expansion, and dew may accumulate in the gap G. When the gap G further grows and spreads over the entire sheet surface, room air may convect between the first sheet 2 and the window glass 6 and the heat insulating property may be reduced.

Further, with the thermal expansion and contraction of the first sheet 2, the double-sided adhesive tape is peeled off, and as a result, the corners of the heat insulating sheet 1 are turned up and the appearance is sometimes impaired.

SUMMARY OF THE INVENTION The present invention has been made to solve such a problem, and has as its object to provide a window glass made of at least two heat insulating sheet members integrally formed with an air layer interposed therebetween. It is an object of the present invention to provide a heat insulating sheet for a window glass, in which the heat insulating sheet material on the side of the window glass is not easily thermally deformed.

[0012]

SUMMARY OF THE INVENTION In order to solve the above-mentioned object, the present invention provides a resin-made first sheet attached to a window glass through an adhesive means such as a double-sided adhesive tape, and a first sheet made of resin. In a heat insulating sheet for a windowpane integrally formed with a resin-made second sheet and a spacer forming an air layer therebetween, the thickness of the first sheet is equal to the thickness of the second sheet. It is characterized by being 80% (1.8 times) or more thicker than that.

As described above, the thickness of the first sheet on the side of the window glass is made thicker than other sheet materials, and the rigidity of the first sheet is increased, so that the first sheet can be subjected to high temperature in summer or cold in winter. Even if exposed, thermal expansion or thermal shrinkage of the first sheet is suppressed, and the first sheet hardly peels off from the window glass surface.

In the present invention, since only the first sheet is thickened, the overall thickness of the heat insulating sheet for window glass is not so different from that of the conventional heat insulating sheet. It does not become extremely bulky when storing or transporting.

Further, the present invention provides a first resin sheet attached to the window glass side via an adhesive means such as a double-sided adhesive tape, a second resin sheet disposed indoors, In a heat insulating sheet for a windowpane, in which a spacer forming an air layer is integrally formed, a resin having a smaller coefficient of thermal expansion than the second sheet and the spacer is used for the first sheet. This also achieves the above object.

In the present invention, it is preferable that only the first sheet is subjected to a UV treatment for absorbing or reflecting ultraviolet rays. Similarly, it is preferable that only the first sheet contains a predetermined pigment that makes the first sheet translucent or opaque.

According to this, the desired UV absorbing agent and blinding effect can be obtained by minimizing the amount of the UV treating agent or pigment used.

[0018]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing a first embodiment of the present invention; In this embodiment, portions that are the same as or are considered to be the same as those in the conventional example of FIG. 6 described above are given the same reference numerals.

FIG. 1 is a front view showing a first embodiment of the present invention, and FIG. 2 is a sectional view taken along line AA of FIG. Also in the heat insulating sheet 1a for window glass, the three resin sheets of the first sheet 2a, the second sheet 3, and the spacer sheet 4 interposed therebetween, each of which is made of one flexible resin sheet, are used. Each of these sheets is integrally bonded by, for example, heat fusion.

The spacer sheet 4 has irregularities 41 having a rectangular waveform in cross section. In this embodiment, irregularities 41 due to cylindrical projections (see FIG. 1) projecting from one surface toward the other surface.
Are formed at predetermined intervals, and the air layer 5 is formed between the first sheet 2 and the second sheet 3 by the unevenness 41.

In this embodiment, the first sheet 2a, the second sheet 3, and the spacer sheet 4 are each made of the same resin sheet (polyethylene sheet), but one of the first sheets 2a is attached to the periphery. Window glass 6 through double-sided adhesive tape (or adhesive)
The thickness of the first sheet 2a is 80% (1.8 times) or more of the thickness of the spacer sheet 4 and the second sheet 3 on the indoor side.

For example, if the thickness of the spacer sheet 4 and the second sheet 3 is 20 μm, the first sheet 2a
Has a thickness of 36 μm or more.
And when the thickness of the second sheet 3 is 50 μm,
The first sheet 2a has a thickness of 90 μm or more.

As described above, the rigidity of the first sheet 2a is increased by setting the thickness of the first sheet 2a attached to the window glass 6 side to 80% or more of other sheet materials,
For example, even if it is exposed to direct sunlight in the middle of summer for a long time, its thermal expansion is suppressed, and the gap G
(See FIG. 7) is prevented from occurring.

In this embodiment, the spacer sheet 4
And the second sheet 3 have the same thickness, but the spacer sheet 4 may be thicker or thinner than the second sheet 3, that is, the first sheet 2 a is 80% smaller than the second sheet 3.
What is necessary is just to have the above thickness.

Next, a heat insulating sheet 1b for a window glass as a second embodiment shown in FIG. 4 which is a front view of FIG. 3 and a sectional view taken along the line BB of FIG. 3 will be described. The second embodiment is positioned as a modification of the first embodiment, and each of the first sheet 2a, the second sheet 3, and the partition wall 4a as a spacer for forming the air layer 5 therebetween is formed by: This is an example of a case where the same resin material (for example, polyethylene) is integrally formed by extrusion or the like.

In the second embodiment, as in the first embodiment, the thickness of the first sheet 2a adhered to the window glass 6 via a double-sided adhesive tape or an adhesive is set to the second sheet.
The thickness is set to be 80% or more of the thickness of the sheet 3.

As a result, the rigidity of the first sheet 2a side is increased, and the thermal expansion of the first sheet 2a is suppressed even if the first sheet 2a is exposed to direct sunlight in the summer for a long time, as in the first embodiment. There is no possibility that a gap G is generated between the window glass 6 and the conventional device.

Next, a heat insulating sheet 1c for window glass as a third embodiment shown in FIG. 5 will be described. In the third embodiment, the first sheet 2a, the second sheet 3, and the spacer sheet 4 have the same thickness, respectively, and the window glass 6
This is to suppress the thermal expansion and thermal contraction of the first sheet 2a attached to the side.

That is, in the third embodiment, a resin sheet having a smaller coefficient of thermal expansion than the second sheet 3 and the spacer sheet 4 is used as the first sheet 2a.

For example, when the second sheet 3 and the spacer sheet 4 are 50 μm thick polyethylene sheets,
As the first sheet 2a, a resin sheet made of polyethylene terephthalate having a thickness of 50 μm is used.

According to this, the heat insulating sheet for window glass 1c
Although the overall thickness of the first sheet 2a is the same as the conventional one, even if the first sheet 2a is exposed to the direct sunlight of midsummer for a long time, the thermal expansion thereof is suppressed, and the window glass 6 and the There is no risk that a gap G will occur between the two.

Incidentally, also in the third embodiment, the first sheet 2
“a” is attached to the window glass 6 via a double-sided adhesive tape or an adhesive attached to the periphery thereof. The first sheet 2a, the second sheet 3, and the spacer sheet 4 are integrally joined by, for example, heat fusion.

The heat insulating sheet 1 for a window glass according to the first embodiment.
a and the UV sheet that absorbs or reflects ultraviolet light, the first sheet 2a, the second sheet 3, and the spacer sheet 4 are subjected to UV processing. There is no need to perform UV treatment only on the first sheet 2a that is directly exposed to sunlight, and the usage fee of the UV agent can be further reduced.

Similarly, even if the heat insulating sheet is made to be translucent or transparent so that the heat insulating sheet has a so-called blind effect, only the first sheet 2a needs to contain a pigment as a blind material. Thereby, the cost can be further reduced.

[0035]

As described above, according to the present invention,
A first sheet adhered to a window glass via a double-sided adhesive tape or an adhesive, a second sheet disposed on the indoor side with respect to the first sheet, and a spacer sheet forming an air layer between these sheets are integrally formed. In the case where the respective sheets are made of the same resin material, the first sheet is made to be 80% or more thicker than the thickness of the second sheet. The thermal expansion and thermal shrinkage of the glass sheet are effectively suppressed, the dew condensation does not occur between the glass sheet and the window glass, and the convection phenomenon does not occur between the first sheet and the glass sheet. A heat insulating sheet for a window glass is provided.

In the above-mentioned heat insulating sheet for window glass, only the first sheet adhered to the window glass via a double-sided adhesive tape or an adhesive is used as a resin sheet having a smaller coefficient of thermal expansion than other sheet materials. By doing so, the same effect can be obtained while keeping the overall thickness equal to the conventional thickness.

Further, in obtaining a blinding effect by UV treatment and / or pigment addition, according to the present invention, the treatment is applied to the first sheet adhered to the window glass via a double-sided adhesive tape or an adhesive. It only needs to be performed, and a cheaper heat insulating sheet for window glass can be provided.

[Brief description of the drawings]

FIG. 1 is a front view showing a heat insulating sheet for a window glass according to a first embodiment of the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a front view showing a heat insulating sheet for a window glass according to a second embodiment of the present invention.

FIG. 4 is a sectional view taken along line BB of FIG. 3;

FIG. 5 is a sectional view showing a heat insulating sheet for a window glass according to a third embodiment of the present invention.

FIG. 6 is a sectional view similar to FIG. 2 showing a heat insulating sheet for window glass as a conventional example.

FIG. 7 is a partially enlarged cross-sectional view for explaining the problem of the conventional example.

[Explanation of symbols]

 1a, 1b1c Insulation sheet for window glass 2 First sheet 3 Second sheet 4 Spacer sheet 4a Partition wall 5 Air layer 6 Glass

Claims (4)

[Claims] 1. A first resin sheet attached to a window glass side via an adhesive means such as a double-sided adhesive tape, a second resin sheet disposed on the indoor side, and an air layer therebetween. In a heat insulating sheet for a window glass, which is formed integrally with a spacer that forms a window, the thickness of the first sheet is at least 80% greater than the thickness of the second sheet. Thermal insulation sheet for glass. 2. A first resin sheet attached to the window glass side via an adhesive means such as a double-sided adhesive tape, a second resin sheet disposed on the indoor side, and an air layer between them. In the heat insulating sheet for a windowpane, which is formed integrally with a spacer that forms a resin, the first sheet is made of a resin having a smaller thermal expansion coefficient than the second sheet and the spacer. A heat insulating sheet for window glass characterized by the above. 3. The heat insulating sheet for a window glass according to claim 1, wherein only the first sheet is subjected to a UV treatment for absorbing or reflecting ultraviolet rays. 4. The heat insulation for a window glass according to claim 1, wherein only the first sheet contains a predetermined pigment which makes the first sheet translucent or opaque. Sheet.