JP6189062B2 - Insulation sheet for window glass - Google Patents

Description

  The present invention relates to a heat insulating sheet for window glass in which a base sheet having a heat insulating air layer inside is attached to a window glass by water bonding, and more specifically, relates to a heat insulating sheet for window glass excellent in light shielding properties and water absorption.

  In particular, window glass in winter often forms condensed water on the glass surface due to the difference in temperature and temperature from the outside air. If a large amount of condensed water is generated, it spills into the room and soils walls and floors. If it accumulates in a sash and freezes, the window cannot be opened.

  Thus, for example, Patent Document 1 discloses a heat insulating sheet for window glass that is intended to prevent the generation of condensed water by attaching a heat insulating sheet having an air heat insulating layer called a cap layer to the indoor side of the window glass. Proposed.

  However, even if this type of heat insulating sheet is attached, condensation may occur on the surface of the heat insulating sheet when the temperature is low such as in a cold district or in the morning where the temperature difference between the inside and outside temperatures is large. Moreover, since the conventional heat insulating sheet for window glass is a resin material although it is transparent so as not to disturb the daylighting property, it does not look very good unlike glass.

JP 2008-302568 A

  Then, the subject of this invention is providing the heat insulation sheet | seat for windowpanes provided with the makeup | decoration property which is still more attractive, without dripping down indoors, even if dew condensation arises on the surface of a heat insulation sheet | seat.

In order to solve the above-described problems, the present invention has several features described below. That is, in a heat insulating sheet for window glass that includes a base sheet made of a synthetic resin having an air heat insulating layer inside, and one surface of the base sheet is attached to a window glass , one surface of the base sheet is a window The water- absorbing sheet made of paper is integrally bonded to the other surface of the base sheet, and the water-absorbing sheet contains pulp. 30 to 95 wt% is blended, and the thickness T of the water-absorbing sheet is 90 μm <T ≦ 200 μm .

  As a more preferred embodiment, the water absorbent sheet is characterized by containing a Japanese paper raw material and / or a western paper raw material.

  According to the present invention, the water absorbent sheet made of paper is integrally bonded to the other surface (inner side surface) of the base sheet having the air heat insulating layer therein, thereby the surface (chamber of the base sheet). Even if dew condensation occurs on the inner surface), the dew condensation water is absorbed and retained by the water absorbing sheet, so that it is possible to prevent dirt on the wall surface and floor surface of the room due to dripping of the dew condensation water.

  In addition, since the water-absorbent sheet is made of paper (Japanese paper or Western paper), it not only has good water absorption, but also has an old Japanese shoji texture that can be applied to a living room or other window glass. Will not be damaged.

  It is preferable that 30 to 95 wt% of pulp is mixed in the water absorbing sheet, or the thickness T of the water absorbing sheet is preferably 90 μm <T ≦ 200 μm, whereby the waterproof sheet made of paper swells with water and is dried. By contracting, wrinkles and inner curling can be prevented.

  Since one surface of the base sheet has water sticking property, it can be easily pasted simply by spraying water on the base sheet side or window glass side and sticking the water sticking surface on the window glass. .

  By sticking the base sheet with water in a water absorbent sheet, water enters between the fibers of the waterproof sheet while the base sheet is attached to the window, and the fibers are released and dried. Curling and wrinkles that have occurred in the entire heat insulating sheet are alleviated.

The principal part exploded sectional view of the heat insulation sheet concerning one embodiment of the present invention.

  Next, embodiments of the present invention will be described with reference to the drawings, but the present invention is not limited thereto.

  As shown in FIG. 1, this heat insulating sheet for window glass (hereinafter sometimes simply referred to as “heat insulating sheet”) 1 includes a base sheet 2 having an air heat insulating layer 21 inside, and one surface of the base sheet 2 ( 1 is provided with a water absorbent sheet 3 that is integrally bonded to the upper surface in FIG. Although FIG. 1 is drawn in a disassembled state for the sake of explanation, the window glass heat insulating sheet 1 is actually formed as a single sheet body.

  The base sheet 2 includes a partition film 22 having irregularities formed thereon, and an outer film 23 and an inner film 24 that are bonded together so as to sandwich both surfaces of the partition film 22.

  In this embodiment, the partition film 22 is formed of a so-called air cap film in which cylindrical convex portions are arranged in a staggered manner with a predetermined interval, and both sides thereof are sandwiched and integrated by the outer film 23 and the inner film 24. Thus, the base sheet 2 having the air heat insulating layer 21 is formed.

  The outer film 23 is a synthetic resin film, and one surface (the upper surface in FIG. 1) is integrally attached to the partition film 22 by thermal lamination. In this embodiment, the other surface (the lower surface in FIG. 1) of the outer film 23 is provided with a water sticking property that allows the outer film 23 to be stuck to a window glass (not shown). In addition, you may join using an adhesive or an adhesive instead of a heat laminate.

  In this embodiment, the outer film 23 is made of a polyolefin resin. Thereby, the hydrophilicity of the outer film 23 is improved, and so-called water pasting, in which water is applied to the surface of the outer film 23 and pasted on the window glass, becomes possible. In addition, water may be apply | coated to a window glass and the outer film 23 may be bonded together there.

  In addition to this, in order to give the outer film 23 a water sticking property, for example, the surface of the outer film 23 may be subjected to corona discharge machining to form a microvoid to further improve the water sticking property.

  A synthetic resin film is used for the inner film 24, and one surface (the lower surface in FIG. 1) is attached to the partition film 22 by thermal lamination. The water absorbent sheet 3 is integrally bonded to the other surface (the upper surface in FIG. 1) of the inner film 24. In addition, you may join using an adhesive or an adhesive instead of a heat laminate.

  The water absorbing sheet 3 is preferably bonded integrally to the inner film 24 by heat lamination, but may be integrated via an adhesive or a pressure sensitive adhesive.

  The water absorbing sheet 3 is made of a paper material. In this embodiment, the paper material is made of a paper paper material and / or a Japanese paper material, and these are blended alone or mixed at a predetermined blending ratio.

  As the paper material, general pulp or the like is used, but other materials may be used. As the Japanese paper raw material, raw materials used for Japanese paper materials such as hemp and straw can be used.

  Since the water absorbing sheet 3 is made of a paper material, it swells when it contains water and shrinks when it is dried. Therefore, depending on the thickness and configuration of the water absorbent sheet 3, the water absorbent sheet 3 is wrinkled or curled due to swelling and shrinkage. Therefore, 30 to 95% of the pulp is blended in the water absorbing sheet 3 and the thickness T is set to be 90 μm <T ≦ 200 μm.

  According to this, when the pulp compounding amount is less than 30%, the expansion and contraction ratio of the water absorbent sheet is poor, and it is not preferable because wrinkles and irregularities after water absorption drying are difficult to remove. On the contrary, if the pulp content exceeds 95%, there is no stiffness and the strength becomes too weak.

  In addition, when the thickness T is less than 90 μm, the strength becomes too weak, which is not preferable. Conversely, when the thickness T exceeds 200 μm, the strength becomes too high, which is not preferable.

  Thus, even if condensation occurs on the surface of the base sheet 2 by integrally bonding the water-absorbing sheet 3 containing a paper material to the base sheet 2, the condensed water is absorbed by the water-absorbing sheet 3 to evaporate. Therefore, it is possible to prevent the condensed water from dripping.

  Moreover, since the water absorbing sheet 3 is a paper material, the appearance and texture can be improved by making use of the texture of the paper material, and the interior design atmosphere is not impaired even if it is attached to a window glass.

  An example of the order of attaching the heat insulating sheets 1 will be described with reference to FIG. First, water is sprayed on both surfaces (the outer film 23 side and the water absorbing sheet 3 side) of the heat insulating sheet 1. Examples of the method of adding water include spraying water and applying water with a brush.

  Next, the outer film 23 of the heat insulating sheet 1 coated with water is pasted along a window glass (not shown) while air is extracted from one end side to the other end side. After pasting, the water absorbent sheet 3 is left for a while to dry.

  As described above, the water-absorbing sheet 3 once contains water, so that the base sheet 2 sticks to the window glass, and water enters between the fibers and is dried after the fibers are released. The curling force and wrinkles (unevenness) generated in the film are alleviated, and a stable application state can be maintained over a long period of time.

  Moreover, in order to further relieve the curling force still left on the water absorbent sheet 3, it is preferable to spray the water absorbent sheet 3 once dried and dry it. More preferably, by repeating this two or three times, the curling force of the water absorbent sheet 3 is almost eliminated, and the heat insulating sheet 1 can be brought into close contact with the window glass surface.

  Next, specific examples of the present invention will be examined together with comparative examples. First, four water-absorbing sheets of Examples 1 to 3 and Comparative Example 1 were prepared. Each test piece was subjected to the following stretch test and water absorption test. The test environment for each test was a test environment based on JIS-Z8703.

[Extension test]
First, each water-absorbing sheet (width (width) 20 cm x length (length) 20 cm) is dipped in a water tank, taken out, dried naturally, before being dipped in water (blank state), and dimensional change after drying ( The amount of expansion and contraction was measured. The measurement was performed on a blank test piece, and then water impregnation and drying were repeated five times, and the average dimensional change was measured both in the vertical and horizontal directions. The average thickness was also measured. The case of shrinking as a dimensional change was designated as (−).

[Water absorption test]
Before each water absorbent sheet (10 cm long × 10 cm wide) was soaked in water (blank state) and after being soaked in water, the weight of the water absorbent sheet was measured. Each test was performed three times, and the average amount of change was calculated. The test condition was that a blank test piece at room temperature was dried by heating to 50 ° C., then immersed in water for 3 hours and then taken out, and each weight during drying by heating and at the time of water absorption was measured three times. The average water absorption was calculated.

  Below, the specifications of the water-absorbing sheets of Examples 1 to 3 and Comparative Example 1, and the results of the stretch test and the water absorption test are shown.

Example 1
[Blend ratio] 40% pulp, 5% vinylon, 25% cocoon, 15% hemp, 15% rayon
[Average thickness] 120μm
[Average lateral change] -0.69%
[Average change in vertical direction] -1.00%
[Average water absorption] 1.32 g

Example 2
[Blend ratio] 75% pulp, 5% vinylon, 20% synthetic fiber
[Average thickness] 115μm
[Average change in horizontal direction] -1.25%
[Average longitudinal change] -0.88%
[Average water absorption] 1.22 g

Example 3
[Blend ratio] 95% pulp, 5% vinylon
[Average thickness] 100μm
[Average lateral change] -1.06%
[Average change in vertical direction] -0.81%
[Average water absorption] 1.10 g

<Comparative example 1>
[Blend ratio] 100% polyester
[Average thickness] 90μm
[Average lateral change] -0.06%
[Average change in vertical direction] -0.06%
[Average water absorption] 0.88g

  The specifications and specific measurement amounts of Examples 1 to 3 and Comparative Example 1 are shown in Table 1, and specific measurement results for the amount of water absorption are shown in Table 2.

  Next, a heat insulating sheet is prepared by bonding the water-absorbing sheet of Example 3 to a base sheet (width (width) 900 mm × length (length) 900 mm) by heat lamination. This heat insulating sheet is attached to the window glass by water. In the water pasting, water is sprayed on the window glass side by spraying, and then the water pasting surface of the heat insulating sheet is pasted on the window glass, and the water is sprayed evenly by spraying together with the water absorbing sheet 3.

  In addition, as a comparative example, a heat insulating sheet adhered with water without giving water to the water absorbing sheet 3 was separately prepared. After that, after being dried for 24 hours after being attached to the window glass, it was visually confirmed whether or not the four sides of both heat-insulating sheets were rolled up. Moreover, after spraying water on the water-absorbing sheet 3 side of each heat insulating sheet of the example and the comparative example and drying, the curl on each side was confirmed. This was repeated 1-3 times and confirmed for each.

  The results are shown below. The summary is shown in Table 3.

Example 4
[Apply water to both the base sheet and water-absorbing sheet to apply water]
[First time] ○
[First time] ○
[Second time] small curl [third time] small curl

<Comparative example 2>
[Only base sheet absorbs water and sticks water]
[First time] ○
[1st] Curling [2nd] Curling [3rd] Curling

  According to the heat insulating sheet 1, the water absorbing sheet 3 is integrally bonded to the surface of the base sheet 2, so that even if dew condensation occurs on the surface of the base sheet, the water absorbing sheet 3 absorbs the condensed water. Can be prevented from dripping down.

DESCRIPTION OF SYMBOLS 1 Insulation sheet for window glass 2 Base sheet 21 Air insulation layer 22 Partition film 23 Outer film 24 Inner film 3 Water absorption sheet

Claims (2)

Including a synthetic resin base sheet having an air heat insulating layer inside, and in the heat insulating sheet for window glass to paste one side of the base sheet to the window glass,
While one surface of the base sheet has a water sticking property capable of water sticking to the window glass,
On the other surface of the base sheet, a water absorbent sheet made of paper material is integrally bonded ,
A heat insulating sheet for window glass , wherein pulp is blended in the water absorbent sheet in an amount of 30 to 95 wt%, and the thickness T of the water absorbent sheet is 90 μm <T ≦ 200 μm .   The heat insulating sheet for window glass according to claim 1, wherein the water-absorbing sheet contains a Japanese paper raw material and / or a paper paper raw material.

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