JP5396289B2 - Moisture absorption and heat insulation sheet - Google Patents

Description

  The present invention relates to a hygroscopic exothermic heat insulating sheet, and more particularly to a hygroscopic exothermic heat insulating sheet that generates heat by a hygroscopic exothermic fiber layer and can retain the heat by bubbles in the bubble sheet layer.

In recent years, underwear and clothes using hygroscopic exothermic fibers have been commercialized and attract attention. That is, this moisture-absorbing exothermic fiber absorbs sweat (absorbs moisture) and repeats heat generation and moisture release, thereby providing dry warmness without stuffiness.
Various techniques have been proposed in relation to the hygroscopic exothermic function of the hygroscopic exothermic fiber.

  For example, Patent Document 1 discloses that a web is formed by mixing hygroscopic and moisture-absorbing exothermic fibers and a composite fiber composed of a high melting point fiber and a low melting point fiber, and the web is laminated on a flexible polyurethane foam sheet. After entanglement between fibers and fibers and a flexible polyurethane foam sheet by punching, the fibers are heated to the melting point of the low melting point fiber or more, and the fibers and the fiber and the flexible polyurethane foam sheet are bonded together by fusion. Techniques for manufacturing a composite material having heat retention, moisture absorption / release moisture absorption / heat generation properties are disclosed.

  Further, Patent Document 2 is a resin molded body composed of at least a binder resin and silica, wherein 30% or more of the pore volume of the silica is open to the outside of the resin molded body. Furthermore, there is disclosed a technique of a resin molded body comprising a base material composed of at least a sheet, wherein the silica is fixed to at least a part of the base material with the binder resin.

  Patent Document 3 discloses an industrial material composed of non-elastic fibers and elastic fibers, which has a maximum temperature rise of 1 ° C. or higher when absorbing moisture and / or water, and the industrial material is a sheet member or a case member. An industrial material technology characterized by this is disclosed.

  Furthermore, in Patent Document 4, an elastic fiber composed of non-elastic fibers and elastic fibers and having hygroscopic heat generation performance is mainly disposed in a thread-like core portion, and the maximum temperature rise during moisture absorption and / or water absorption is 1 ° C. or more. An elastically processed yarn technique characterized by this is disclosed.

JP-A-9-109305 JP 2006-63300 A Japanese Patent Laid-Open No. 2004-232101 Japanese Patent Laid-Open No. 2005-42284

However, the technique described in Patent Document 1 has a problem that, for example, when a flexible polyurethane foam sheet absorbs moisture, a sufficient heat retaining effect cannot be exhibited.
Moreover, the technique described in Patent Document 2 has a problem that, for example, when the sheet serving as the base material is a bubble sheet, the manufacturing process becomes complicated and the manufacturing cost cannot be reduced. .
Furthermore, since the techniques described in Patent Document 3 and Patent Document 4 do not have a member that actively retains heat, there is a problem that a sufficient heat retaining effect cannot be exhibited.

  Further, from the viewpoint of protecting the global environment, there is a demand for a material that effectively uses the hygroscopic heat generation effect and that effectively retains the generated heat. Such materials are required to have excellent heat generation and heat retention, as well as recyclability and economy (the selling price is low).

  The present invention has been proposed in order to meet the above-described problems and demands, and aims to provide a moisture-absorbing and heat-retaining sheet that is excellent in heat generation and heat retention, as well as in recyclability and economy. And

  In order to achieve the above object, the moisture-absorbing and exothermic heat-insulating sheet of the present invention has a moisture-absorbing and exothermic fiber layer bonded to at least one surface of the bubble sheet layer, and heat generated by the moisture-absorbing and exothermic fiber layer is It is configured to store heat inside.

  ADVANTAGE OF THE INVENTION According to this invention, while being excellent in heat_generation | fever property and heat retention, the unique moisture absorption heat_generation | fever heat retention sheet excellent in recyclability, economical efficiency, etc. can be provided.

FIG. 1 is a schematic view of a moisture-absorbing exothermic heat-retaining sheet according to the first embodiment of the present invention, (a) showing a cross-sectional view, and (b) showing an enlarged cross-sectional view of a main part. FIG. 2 shows a schematic cross-sectional view of the moisture-absorbing heat-generating and heat-insulating sheet according to the first application example of the present invention. FIG. 3: has shown schematic sectional drawing of the moisture absorption heat_generation | fever heat retention sheet concerning the 2nd application example of this invention. FIG. 4: has shown schematic sectional drawing of the moisture absorption heat retention sheet | seat concerning 2nd embodiment of this invention. FIG. 5: has shown schematic sectional drawing of the moisture absorption heat_generation | fever thermal insulation sheet concerning the 3rd application example of this invention.

[First embodiment]
FIG. 1 is a schematic view of a moisture-absorbing exothermic heat-retaining sheet according to the first embodiment of the present invention, (a) showing a cross-sectional view, and (b) showing an enlarged cross-sectional view of a main part.
In FIG. 1, the moisture-absorbing and exothermic heat-insulating sheet 1 of the present embodiment includes a bubble sheet layer 10 and a moisture-absorbing and exothermic fiber layer 2 bonded to the back film 11 of the bubble sheet layer 10.
In addition, although the bubble sheet layer 10 is a sheet | seat which has a softness | flexibility normally, it is not limited to this, For example, the bubble board (not shown) which has moderate rigidity may be sufficient.

(Bubble sheet layer)
The bubble sheet layer 10 includes a back film 11 and a cap film 12 on which a large number of protrusions are formed, and the back film 11 and the cap film 12 are bonded to each other so that bubbles 14 are formed in the protrusions. . Due to the bubbles 14, the bubble sheet layer 10 can exhibit excellent cushioning properties and heat insulation properties. Further, the air bubble sheet layer 10 can store heat with the air bubbles 14 when the moisture-absorbing exothermic fiber layer 2 described later generates heat.
Moreover, the material of the back film 11 and the cap film 12 constituting the bubble sheet layer 10 is usually polyethylene or polypropylene. It should be noted that the flexibility (or rigidity) of the bubble sheet layer 10 can be arbitrarily adjusted by changing the type and composition of the above materials.
The bubble sheet layer 10 is widely used as bubble wrap (registered trademark), and is excellent in economic efficiency. Moreover, although not shown in figure, the some protrusion is arrange | positioned in the zigzag form or the matrix form etc. in the state which opened the predetermined clearance gap.
Moreover, you may use the bubble sheet layer 10a mentioned later instead of the bubble sheet layer 10. FIG.

(Hygroscopic exothermic fiber layer)
The hygroscopic exothermic fiber layer 2 is a layer containing fibers that absorb hygroscopic heat (hygroscopic exothermic fibers), and is a nonwoven fabric in this embodiment. As the hygroscopic exothermic fiber, an acrylate fiber or the like that is usually made by modifying acrylic or the like of a synthetic fiber so as to contain a large amount of moisture is used. Moreover, although the composition of said nonwoven fabric is 100% of hygroscopic exothermic fiber, it is not limited to this. For example, a fabric in which hygroscopic exothermic fibers are mixed with other fibers (for example, cotton, nylon fibers, polyester fibers, etc.) may be used.
The hygroscopic exothermic fiber layer 2 is not limited to a nonwoven fabric, and may be a woven fabric, for example.
Further, the hygroscopic exothermic fibers are not limited to acrylate fibers, and may be any fibers that generate hygroscopic heat. Furthermore, although it is preferable that the maximum temperature rise at the time of moisture absorption is 2 degreeC or more, it is not limited to this, For example, 1 degreeC or more may be sufficient.

The hygroscopic exothermic fiber layer 2 is bonded to the back film 11 of the bubble sheet layer 10. In the present embodiment, immediately after the back film 11 and the cap film 12 are thermally welded, the hygroscopic exothermic fiber layer 2 (the portion near the bonding surface of the hygroscopic exothermic fiber layer 2) and the back film 11 are thermally welded. Thus, the hygroscopic exothermic fiber layer 2 is bonded to the back film 11. When heat welding is performed in this manner, as shown in FIG. 1 (b), the spliced portion of the nonwoven fabric (a part of the hygroscopic exothermic fiber 21) enters the back film 11 (due to the anchor effect), so that appropriate bonding is achieved. Strength can be realized. Moreover, the bonded hygroscopic exothermic fiber layer 2 can be peeled off, and the recyclability of the hygroscopic exothermic heat insulating sheet 1 can be improved.
The bonding method is not limited to the above. For example, although not shown, the portion of the back film 11 and the hygroscopic exothermic fiber layer 2 that do not interfere with the bubbles 14 are spot-welded, or You may join using a hot melt, an adhesive agent, etc.

When the moisture absorption exothermic fiber layer 2 absorbs moisture, the moisture absorption exothermic fiber layer 2 generates heat, and the bubble sheet layer 10 can keep the heat. In other words, the moisture-absorbing and heat-retaining sheet 1 has a heat-retaining function because the moisture-absorbing and exothermic fiber layer 2 self-heats and stores heat in the bubbles 14.
Next, examples of the hygroscopic heat retaining sheet 1 will be described.

[Production of hygroscopic heat insulation sheet]
As the bubble sheet layer 10, a commercially available bubble sheet (manufactured by Kawakami Sangyo Co., Ltd .: bubble wrap # 40 (projection diameter: about 10 mm, height: about 3.5 mm, pitch: about 11 mm)) was used.
Further, as the hygroscopic exothermic fiber layer 2, a highly hygroscopic exothermic fiber (trade name: Moiscare (registered trademark), acrylate fiber, thickness of about 2 mm) manufactured by Toyobo Co., Ltd. was used.
Further, immediately after the back film 11 and the cap film 12 of the bubble sheet layer 10 are thermally welded, the hygroscopic exothermic fiber layer 2 (the portion in the vicinity of the bonding surface of the hygroscopic exothermic fiber layer 2) and the back film 11 are thermally welded. By doing so, the moisture absorption exothermic fiber layer 2 was joined to the back film 11, and the moisture absorption exothermic heat retention sheet 1 was manufactured.

[Evaluation test of heat generation and heat retention]
The produced moisture-absorbing exothermic heat-insulating sheet 1 was dried in a dryer for 2 hours and left in a desiccator containing silica gel for 8 hours. Subsequently, after leaving it in an environment of 20 ° C. × 40% RH (relative humidity) for 2 hours using a thermo-hygrostat, the setting is immediately changed to an environment of 20 ° C. × 90% RH (relative humidity) to absorb moisture. The temperature change of the exothermic heat insulating sheet 1 was measured. In addition, a thermocouple temperature sensor made of a thin wire (for example, a diameter of 0.1 mm) was used for temperature measurement, and this thermocouple temperature sensor was attached in the hygroscopic exothermic fiber layer 2.
About 5 minutes after changing the above setting, the environment becomes 20 ° C. × 90% RH (relative humidity), and as the relative humidity increases, the temperature of the hygroscopic heat retaining sheet 1 rises and the setting is changed. After about 4 minutes, the temperature rose from 20 ° C. to about 22 ° C., and then the temperature gradually decreased to 20 ° C. after about 45 minutes.

On the other hand, as a comparative example, when the same test as described above was performed only on the hygroscopic exothermic fiber layer 2 instead of the hygroscopic exothermic heat-insulating sheet 1, about 5 minutes after changing the above settings. After that, it becomes an environment of 20 ° C. × 90% RH (relative humidity), and the temperature of the hygroscopic exothermic fiber layer 2 rises as the relative humidity increases, and after about 4 minutes after changing the setting, the temperature starts from 20 ° C. The temperature rose to about 22 ° C., and then the temperature gradually decreased to 20 ° C. after about 25 minutes.
That is, the hygroscopic exothermic heat retaining sheet 1 was able to store the heat obtained by the hygroscopic exothermic fiber layer 2 by the hygroscopic exotherm in the bubbles 14 of the bubble sheet layer 10 and had a heat retaining function.

As described above, the moisture-absorbing and heat-retaining sheet 1 is provided with a unique material having heat-generating properties, heat-retaining properties, etc., because the moisture-absorbing and heat-generating fiber layer 2 self-heats and accumulates heat in the bubbles 14 and has a heat-retaining function. can do.
In other words, this moisture-absorbing heat-generating and heat-insulating sheet 1 is used as a base material (core) for futons, clothes, etc., as a material for heat insulation / condensation prevention such as ceilings, indents, windows, etc. It is effectively used as a heat insulating material or a sound insulating material in place of vinyl or the like as a material or in a greenhouse or storeroom.
In addition, the use of the moisture absorption heat retention sheet 1 is not limited to the above. Further, when used instead of wallpaper or the like, the moisture-absorbing and heat-retaining sheet 1 may further include a cosmetic sheet and the like.

As described above, according to the moisture-absorbing and heat-retaining sheet 1 of the present embodiment, the heat-generating property and the heat-retaining property are excellent, and the recyclability and economic efficiency can be improved.
Moreover, this embodiment has various application examples.
Next, application examples of the present embodiment will be described with reference to the drawings.

<First application example>
FIG. 2 shows a schematic cross-sectional view of the moisture-absorbing heat-generating and heat-insulating sheet according to the first application example of the present invention.
In FIG. 2, the hygroscopic exothermic heat retaining sheet 1 a of the first application example has three layers having a liner film 13 instead of the two air bubble sheet layers 10 as compared with the hygroscopic exothermic heat insulating sheet 1 of the first embodiment described above. This is different in that the moisture-absorbing exothermic fiber layer 2 is bonded to the liner film 13. In addition, the other structure of this application example is almost the same as the moisture-absorbing heat-generating and heat-insulating sheet 1.
Therefore, in FIG. 2, the same components as those in FIG. 1 are denoted by the same reference numerals, and detailed description thereof is omitted.

The bubble sheet layer 10 a has a configuration in which the liner film 13 is bonded to the protrusion of the cap film 12. The liner film 13 is usually made of substantially the same material as the back film 11 and the like.
However, the material of the liner film 13 is not limited to the above. That is, preferably, a film or cloth having moisture permeability (for example, a woven cloth) may be used in place of the liner film 13 for the purpose of improving the moisture release property of the hygroscopic exothermic fiber layer 2. Examples of the fibers used in the cloth include modified nylon fibers and polyester fibers that have improved moisture absorption and moisture release. In this way, moisture absorbed by the hygroscopic exothermic fiber layer 2 can be efficiently transferred to a region where no protrusion is formed between the cap film 12 and the liner film 13, and the above region is a hygroscopic exothermic fiber. It functions as a channel (moisture release channel) for efficiently discharging moisture absorbed by the layer 2, and the exothermic property of the hygroscopic exothermic fiber layer 2 can be greatly improved.

The hygroscopic exothermic fiber layer 2 has almost the same configuration as that of the first embodiment. This hygroscopic exothermic fiber layer 2 is bonded to the liner film 13 as described above. In the present embodiment, immediately after the liner film 13 and the cap film 12 (the tops of the protrusions) are thermally welded, the hygroscopic exothermic fiber layer 2 (the portion in the vicinity of the bonding surface of the hygroscopic exothermic fiber layer 2), the liner film 13, By heat welding, the hygroscopic exothermic fiber layer 2 is bonded to the liner film 13. When heat-sealing in this manner, although not shown, an appropriate bonding strength can be realized by the thorn-shaped portion of the nonwoven fabric entering the liner film 13 (due to the anchor effect). Moreover, the bonded hygroscopic exothermic fiber layer 2 can be peeled off, and the recyclability of the hygroscopic exothermic heat insulating sheet 1 can be improved.
The bonding method is not limited to the above. For example, although not shown, the portion of the liner film 13 that does not interfere with the bubbles 14 and the hygroscopic exothermic fiber layer 2 are spot-welded, or You may join using a hot melt, an adhesive agent, etc.

  Thus, the moisture absorption exothermic heat retaining sheet 1a of this application example can exhibit substantially the same effect as the moisture absorption exothermic heat retaining sheet 1 of the first embodiment. Further, the region where no protrusion is formed between the cap film 12 and the liner film 13 is used as a flow path (moisture release flow path) for efficiently discharging the moisture absorbed by the hygroscopic exothermic fiber layer 2. In such a case, the exothermic property of the hygroscopic exothermic fiber layer 2 can be greatly improved.

<Second application example>
FIG. 3: has shown schematic sectional drawing of the moisture absorption heat_generation | fever heat retention sheet concerning the 2nd application example of this invention.
In FIG. 3, the moisture-absorbing and heat-generating sheet 1b of the second application example is different from the moisture-absorbing and heat-generating sheet 1 of the first embodiment described above in that the moisture-absorbing and heat-generating fiber layer 2 is bonded to the cap film 12. To do. In addition, the other structure of this application example is as substantially the same as 1st embodiment.
Therefore, in FIG. 3, the same components as those in FIG. 1 are denoted by the same reference numerals, and detailed description thereof is omitted.

Each of the bubble sheet layer 10 and the hygroscopic exothermic fiber layer 2 has substantially the same configuration as that of the first embodiment.
This hygroscopic exothermic fiber layer 2 is thermally welded to the top of the protrusion of the cap film 12. When heat-sealing in this manner, although not shown, an appropriate bonding strength can be realized by the thorn-shaped portion of the nonwoven fabric entering the liner film 13 (due to the anchor effect). Moreover, the bonded hygroscopic exothermic fiber layer 2 can be peeled off, and the recyclability of the hygroscopic exothermic heat-insulating sheet 1b can be improved.
Note that the joining method is not limited to the above. For example, although not shown, the joining may be performed using a hot melt or an adhesive.

  Further, the moisture-absorbing heat-generating and heat-insulating sheet 1b can efficiently move the moisture absorbed by the moisture-absorbing and heat-generating fiber layer 2 to a region where no protrusion is formed between the cap film 12 and the moisture-absorbing and heat-generating fiber layer 2. The region functions as a channel (moisture release channel) for efficiently discharging the moisture absorbed by the hygroscopic exothermic fiber layer 2, and the exothermic property of the hygroscopic exothermic fiber layer 2 can be greatly improved. .

Here, preferably, the moisture absorption exothermic fiber layer 2 is formed with a recess and / or a projection for efficiently discharging moisture absorbed by the moisture absorption exothermic fiber. That is, in this application example, although not illustrated, it is preferable that a large number of cylindrical convex portions are formed on the bonding surface of the hygroscopic exothermic fiber layer 2 so as to correspond to the protrusions of the cap film 12. In this way, the region where the convex portion is not formed (in this application example, the region where the convex portion is not formed and the region where the protrusion is not formed) efficiently absorbs moisture absorbed by the hygroscopic exothermic fiber. It functions as a flow path for discharging well (flow path for moisture release), and can greatly improve heat generation.
In addition, the shape of a convex part or a recessed part is not specifically limited, For example, what is necessary is just a shape which can discharge | emit the water | moisture content which the hygroscopic exothermic fiber absorbed efficiently.

  Thus, the hygroscopic heat-retaining sheet 1b of this application example can exhibit substantially the same effects as the hygroscopic heat-retaining sheet 1 of the first embodiment. In addition, a region in which no protrusion is formed between the cap film 12 and the moisture absorption exothermic fiber layer 2 is a channel for efficiently discharging moisture absorbed by the moisture absorption exothermic fiber layer 2 (moisture release channel). Therefore, the exothermic property of the hygroscopic exothermic fiber layer 2 can be greatly improved.

[Second Embodiment]
FIG. 4: has shown schematic sectional drawing of the moisture absorption heat retention sheet | seat concerning 2nd embodiment of this invention.
In FIG. 4, the moisture-absorbing and exothermic heat-insulating sheet 1 c of this embodiment is different from the moisture-absorbing and exothermic heat-insulating sheet 1 of the first embodiment described above in that the hygroscopic exothermic fiber layer 2 is bonded to the cap film 12. To do. In addition, the other structure of this embodiment is as substantially the same as the moisture absorption heat_generation | fever thermal insulation sheet | seat 1. FIG.
Therefore, in FIG. 4, the same components as those in FIG. 1 are denoted by the same reference numerals, and detailed description thereof is omitted.

  The moisture-absorbing heat-generating and heat-insulating sheet 1 c can absorb moisture and generate heat on both surfaces of the bubble sheet layer 10. That is, the exothermic property can be further improved, and it is not necessary to worry about the front and back of the moisture-absorbing and heat-generating heat retaining sheet 1c when used, so that the usability and the like can be improved.

As described above, according to the moisture-absorbing and heat-generating sheet 1c of the present embodiment, the moisture-absorbing and heat-generating sheet 1 of the first embodiment has substantially the same effect, and absorbs moisture and generates heat on both surfaces of the bubble sheet layer 10. The heat generation can be further improved, and the usability can be improved.
Moreover, this embodiment has various application examples.
Next, application examples of the present embodiment will be described with reference to the drawings.

<Third application example>
FIG. 5: has shown schematic sectional drawing of the moisture absorption heat_generation | fever thermal insulation sheet concerning the 3rd application example of this invention.
In FIG. 5, the hygroscopic exothermic heat retaining sheet 1 d of the third application example is different from the hygroscopic exothermic heat insulating sheet 1 a of the first application example described above in that the hygroscopic exothermic fiber layer 2 is also bonded to the back film 11. Is different. In addition, the other structure of this application example is as substantially the same as the moisture absorption heat_generation | fever heat insulation sheet | seat 1a.
Therefore, in FIG. 5, the same components as those in FIG. 2 are denoted by the same reference numerals, and detailed description thereof is omitted.

  This moisture-absorbing heat-generating and heat-insulating sheet 1d can absorb moisture and generate heat on both surfaces of the bubble sheet layer 10a. That is, the exothermicity can be further improved, and it is not necessary to worry about the front and back of the moisture-absorbing and heat-generating heat retaining sheet 1d when used, so that the usability and the like can be improved.

  As described above, the moisture-absorbing / heat-retaining sheet 1d of this application example has substantially the same effect as the moisture-absorbing / heat-retaining sheet 1a of the first application example, and can absorb moisture and generate heat on both surfaces of the bubble sheet layer 10a. Can be further improved, and usability can be improved.

As described above, the hygroscopic exothermic heat retaining sheet of the present invention has been described with reference to preferred embodiments, but the hygroscopic exothermic heat insulating sheet according to the present invention is not limited only to the above-described embodiments, and the scope of the present invention. Needless to say, various modifications can be made.
For example, in the above-described embodiment or the like, the configuration includes a single bubble sheet layer 10 (or a bubble sheet layer 10a), but is not limited thereto. For example, a plurality of sheets (usually two sheets) It is good also as a multilayer structure provided with the bubble sheet layer 10 of above, the hygroscopic exothermic fiber layer 2, etc. If it does in this way, exothermic property and heat retention can be improved further. Note that the stacking order of the bubble sheet layer 10 and the hygroscopic exothermic fiber layer 2 is not particularly limited.

  In addition, the single bubble sheet layer 10 (or the bubble sheet layer 10a) functions as a layer that blocks moisture permeation, but is not limited thereto. For example, although not shown, an opening or a hole for improving the moisture release property of the hygroscopic exothermic fiber layer 2 is formed in the back film 11 and the cap film 12 corresponding to the region where no protrusion is formed. Also good. In this way, the moisture-absorbing and heat-generating fiber layer 2 can generate moisture and generate appropriate moisture, so that the moisture-absorbing and heat generation can be performed almost continuously and heat generation can be improved.

1, 1a, 1b, 1c, 1d Hygroscopic exothermic heat-insulating sheet 2 Hygroscopic exothermic fiber layer
21 Hygroscopic exothermic fiber 10, 10a Bubble sheet layer 11 Back film
12 Cap film
13 Liner film

Claims (6)

  A moisture-absorbing exothermic heat-retaining sheet, wherein a moisture-absorbing exothermic fiber layer is bonded to at least one surface of the cell sheet layer, and heat generated by the moisture-absorbing exothermic fiber layer is stored in the bubbles of the bubble sheet layer.   The hygroscopic exothermic heat-retaining sheet according to claim 1, wherein the hygroscopic exothermic fiber layer is bonded to a back film of the bubble sheet layer.   The hygroscopic exothermic heat-retaining sheet according to claim 1 or 2, wherein the hygroscopic exothermic fiber layer is bonded to a cap film of the bubble sheet layer.   The hygroscopic exothermic heat-retaining sheet according to claim 1 or 2, wherein the hygroscopic exothermic fiber layer is bonded to a liner film of the bubble sheet layer.   The moisture-absorbing exothermic heat-retaining sheet according to claim 4, wherein the liner film is a moisture-permeable film or cloth.   The moisture-absorbing exothermic heat-retaining sheet according to any one of claims 1 to 5, wherein a concave portion and / or a convex portion are formed in the hygroscopic exothermic fiber layer.

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