JP2015073660A - Cold storage device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To basically cold-insulate the body by evaporation heat of water contained in a wetted base material, and improve shape followability of the base material, and a cooling effect when mounting on a cold storage part of the body.SOLUTION: A dry wet reversible base material 2 comprising a polyvinyl acetal resin porous body is wrapped with a holding material 1 with air permeability, and the holding material 1 is given with a body mounting function for making the base material 2 face a cold storage part of the body. The base material 2 comprises an aggregate of a large number of small pieces 21 of the polyvinyl acetal resin porous body. An apparent average volume of the single small piece 21 is desirably 1 mmto 1,000 mm. The holding material 1 is formed of hydrophilic inner cloth 11 and outer cloth 12.

Description

  The present invention relates to a cold insulator, and more particularly, to a cold insulator useful for preventing or keeping a predetermined part of a human body away.

  Conventionally, as this type of cold insulator, a bag part formed with a headband wound around the head or a bandana covered with the head, a bag part formed with a triangular width, etc., containing a water retaining polymer has been known (Patent Document) 1). Also known is a cold insulator in which a wet and dry reversible substrate made of a flat polyvinyl acetal resin porous body is wrapped in a coarse net made of synthetic fiber such as nylon (see Patent Document 2). . The cold insulators described in Patent Document 1 and Patent Document 2 are those that cool the body by the heat of vaporization of water, and are conveniently used to cool a predetermined part of the body.

JP-A-8-247593 JP 2006-238918 A

  In the cooler proposed by Patent Document 1, the water-retaining polymer that has absorbed water and has become a gel is deformed by pressure and leaks from the bag, and slimes adhere to bag portions such as headbands and bandanas. There was something to do. Therefore, when using a cooler, after immersing it in water and making the water-retaining polymer into a gel, after carrying out the troublesome preliminary work of completely washing off the slime adhering to the bag part such as a headband or bandana, There was annoyance that it was necessary to squeeze out moisture and put it on the body.

  On the other hand, in the cold insulator proposed by Patent Document 2, the gel-like substance is not leaked even if water is absorbed, so that slimming does not occur and the cold insulation effect can be maintained for a long time. It has the great advantage of being able to. On the other hand, in this cold insulator, the dry and wet reversible base material made of a flat polyvinyl acetal resin porous body wrapped by a coarse net is cured at the time of drying. It is not possible to get used to the cold parts of the body. Therefore, in this cold insulator, the substrate is sufficiently wetted with water to give the substrate sufficient flexibility, and then the cold insulator is applied to a cold place on the body such as the neck and the forehead. ing.

  However, the cold insulator proposed in Patent Document 2 is a cold insulator because the base material is flat, even if the base material is sufficiently wetted with water and attached to a cold part of the body such as the neck and the forehead. However, there is a problem that not only the shape of the cold-reserved part of the body is well adapted to be in a state of being stiff but also the cold-retaining action is easily impaired, and the soft wearing feeling may be impaired.

  The present invention has been made in view of the above problems, and is based on keeping the body cool by the heat of vaporization of water contained in the wetted base material, and has the wet and dry reversibility shown in Patent Document 2. Even though the base material is wet, as well as when the base material is dry, the base material is a concave body. It is an object of the present invention to provide a cold insulator excellent in soft wearing feeling, which can be easily adapted to the shape of the bulging portion or the swollen portion and hardly causes a tight feeling.

  In addition, an object of the present invention is to provide a cold insulator that has a cooling action that exceeds that of the cold insulator proposed in Patent Document 2 when it is attached to a cold place in the body.

  Furthermore, in the present invention, although the holding material enclosing the base material is provided with a relatively large vent so that the body temperature is easily transmitted to the base material, the base material passes through the vent and falls off. An object of the present invention is to provide a cold insulator that can prevent this.

  In the cold insulator according to the present invention, a dry and wet reversible base material made of a polyvinyl acetal resin porous body is wrapped in a breathable holding material, and the base material faces the cold holding portion of the body in the holding material. It has a basic configuration that it has a body wearing function. And the said base material consists of an aggregate | assembly of many small pieces of a polyvinyl acetal type resin porous body. Further, the holding material includes an inner cloth that includes the aggregate and retains the shape of a flat plate or a round bar, and an outer cloth that wraps the inner cloth and extends to both sides thereof. The outer fabric is made of a woven fabric in which a large number of ventilation holes formed by openings larger than the size of the weave are scattered throughout.

  When the above basic structure is provided, the polyvinyl acetal resin porous body as a base material that absorbs water exhibits excellent water absorption and water content unique to it, and in addition, preferable flexibility when wet Exhibits rebound resilience. In addition, the polyvinyl acetal resin porous body has the property of not causing slimming even when it absorbs water and becomes wet. Therefore, according to the cooler of the present invention having the above basic structure, in use, after the base material is soaked in water by absorbing water, it is immediately attached to the body just by squeezing excess water. Is possible.

  In addition, the cold insulator of the present invention has a characteristic configuration in which the base material is an aggregate of a large number of small pieces of the polyvinyl acetal-based resin porous body. When attached to a cold insulation location, a large number of small pieces forming the aggregate move in the holding material and the base material deforms so as to follow the shape of the cold insulation location (shape followability). Familiarity with the shape and excellent soft feeling. This effect is exhibited not only when the substrate is wet by absorbing water but also when it is dry. Therefore, even when the wet base material is gradually dried over time while wearing the cold insulator on the body, the dry part of the base material is stiff and the good soft wearing feeling is impaired. This situation is unlikely to occur. Furthermore, the base material formed of the aggregate of many small pieces of the polyvinyl acetal resin porous body is formed of the flat polyvinyl acetal resin porous body shown in the above-mentioned Patent Document 2. Compared with what is present, not only the surface area of the base material is increased, but also voids inevitably formed between the small pieces are given to the base material, so that the amount of moisture contributing to the cooling action increases, and that much Cooling action is improved.

  Furthermore, since the holding material is composed of an inner cloth that encloses the aggregate and retains the shape of a flat plate or a round bar, and an outer cloth that wraps the inner cloth and extends to both sides thereof, It is easy to attach a base material made of an aggregate of a large number of small pieces of a polyvinyl acetal resin porous body retained in a flat plate shape or a round bar shape along the neck and forehead. Here, “the shape is retained in the form of a flat plate or a round bar” means a flat strip or strip having a thickness of about several mm to several tens of mm by enclosing a collection of small pieces in an inner cloth. In the case of being bundled, it is meant to include the case where a collection of small pieces is bundled in an inner cloth so as to be bundled into a shape such as a circular cross section, an elliptical cross section, or an oval cross section. For this reason, when running outdoors or walking, there is a convenience that the user can comfortably wear and use it in a cold-reserved portion of the body arbitrarily selected by the user.

  Furthermore, the holding material is divided into an inner cloth that contains the aggregate and is shaped like a flat plate or a round bar, and an outer cloth. When wearing the cold insulator on the body using the body wearing function of the body, the unevenness of the base material is suppressed by the inner cloth that contains the base material, and the uneven base material becomes a hindrance and wears well. It becomes easy to avoid the situation that it becomes impossible.

  In addition, since a large number of vents formed by openings larger than the size of the weave are scattered throughout the woven fabric used for the outer fabric, the air permeability is not limited to the weave, but by the vents. The body temperature is easily transmitted to the base material through the vent, and the vaporization of the moisture that moistens the base material is easily promoted, so that a high cooling action is exhibited. Nevertheless, the non-woven fabric used for the inner fabric that encloses the base material plays a role of reliably confining the small pieces used for the base material, and the non-woven fabric has excellent breathability, It is difficult for a small piece used for the base material to fall out of the vent of the outer cloth, which helps to improve the air permeability of the outer fabric. Furthermore, since the nonwoven fabric is superior in flexibility compared to the woven fabric, the use of the nonwoven fabric for the inner fabric also promotes the shape followability of the substrate.

In the cold insulator according to the present invention, the shape of the small piece of the polyvinyl acetal resin porous body constituting the aggregate as the base material may be a polygonal or disk-shaped thin plate piece or a spherical shape. Good. The apparent average volume of a single piece forming the aggregate is preferably 1 mm ³ or more and 1000 mm ³ or less. If the preferred apparent average volume of a single piece forming an assembly is less than 1 mm ³ , the size of the pieces is too small and tends to integrate together, holding many pieces. Advantages of being difficult to move individually in the material, and the above-mentioned shape followability is impaired when the cold insulator is attached to the cold place of the body, the surface area of the base material is increased, and the gap is formed Can be said to be lost. In addition, when the apparent average volume is larger than 1000 mm ³ , the size of the small pieces is too large, and the advantage relating to the shape followability of the aggregate of many small pieces is easily lost, and the surface area of the base material is increased. It can also be said that the advantages due to the formation of voids are easily lost. The apparent average volume of the desired small pieces is 1 to 1000 mm ³ , and if it is in this range, not only good and reasonable shape followability will be exhibited, but also the amount of moisture contributing to the cooling action will increase and cooling will occur. The action is improved.

  In the present invention, it is desirable that the inner cloth is made of a nonwoven fabric having hydrophilicity. When the inner fabric has hydrophilicity, when the substrate is wetted with water, the inner fabric promotes water penetration into the substrate, and the substrate can be sufficiently wetted in a short time. Become.

  In the present invention, it is desirable that a large number of the vents formed in the outer fabric have a size or a shape that makes it impossible to pass through the individual small pieces forming the aggregate. With this configuration, it is possible to reliably prevent the small piece used for the base material from passing through the vent of the outer cloth and dropping off.

  In the present invention, it is possible to adopt a configuration in which each of the small pieces forming the aggregate includes a woven fabric interlining covered with a polyvinyl acetal resin porous body and integrated. It is. In the present invention, the individual small pieces forming the aggregate are not only those made of a polyvinyl acetal resin porous body (single layer), but, as in this invention, the woven fabric is made of polyvinyl. It is also possible to use only what is covered and integrated (composite) by the acetal resin porous body. Moreover, it is also possible to mix and use such a complex and the above single layer. Even if deterioration of the polyvinyl acetal-based resin porous body progresses in the composite, it is possible to suppress a situation in which the composite is separated from the core and becomes a fine piece or a fine powder. Therefore, not only the service life of the base material is improved, but it is also difficult for the strips or fine powder separated from the interlining to pass through the nonwoven fabric eyes or the outer fabric vents. .

In the present invention, it is desirable that the outer cloth is a woven cloth having a contact cold / warm feeling evaluation value Qmax in the range of the following expression (1) or (2).
Qmax = 0.2W / cm ² (1)
Qmax> 0.2 W / cm ² (2)
W / cm ² represents the amount of heat absorbed per unit area.

  The contact cold / warm feeling evaluation value is generally a value used to evaluate whether the skin surface feels cold or warm when touching the fabric (in the present invention, a holding material or an outer cloth). In other words, it is used as an index for evaluating the fact that the feeling of coolness differs depending on the amount of heat transferred from the skin surface to the fabric, and the larger the value of the contact cool / warm feeling evaluation value Qmax, the cooler sensitivity and the cool feeling of touch Excellent in performance and dryness, improving wear feeling. If the contact cold / warm feeling evaluation value Qmax is smaller than 0.2 W / cm @ 2, it is presumed that sufficient cold sensitivity, contact cool feeling, and dry feeling are hardly obtained.

  As described above, according to the present invention, the effect obtained by the cold insulator proposed by the above-mentioned Patent Document 2, that is, the substrate exhibits a favorable flexibility and rebound resilience when the substrate is wet, Even if it gets wet, there is no sliminess, and the effect that the preparation for wearing on the body is simple is obtained.

  In addition, since the base material is an aggregate of a large number of small pieces of polyvinyl acetal-based resin porous body, it has excellent shape followability when the cold insulator is mounted on a cold insulation location such as the neck and forehead of the body. . For this reason, the cold insulator fits comfortably into the shape of the cold place and an excellent soft wearing feeling is obtained. In addition, since the base material is formed of an aggregate of a large number of small pieces of polyvinyl acetal resin porous body, the surface area of the base material is increased, and voids inevitably formed between the small pieces on the base material. As a result, the amount of moisture that contributes to the cooling action increases and the cooling action is improved accordingly.

  Furthermore, even if the ventilation holes are formed in the outer fabric to improve the overall air permeability, the inner fabric made of a nonwoven fabric as a holding material plays a role of reliably confining small pieces used in the base material. There is an effect that it is difficult for a small piece used for the base material to fall out through the vent.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. It is explanatory drawing which illustrated the specific shape of the small piece. It is explanatory drawing which showed the part which follows the III-III line | wire of FIG. 1 with the expanded cross section. It is the fragmentary top view which showed the outer cloth illustratively. It is the schematic perspective view which showed an example of the structure for exhibiting a body mounting function. It is explanatory drawing of the small piece by a modification.

  FIG. 1 is a schematic external view schematically showing a cold insulator A according to an embodiment of the present invention, with a part thereof broken. The cold insulator A shown in FIG. 1 holds a base material 2 (described later) having wet / dry reversibility in which the soaked water is held and moistened, and the water held under the influence of external heat is vaporized. Wrapped in material 1. The holding material 1 is divided into a flexible inner cloth 11 and a flexible outer cloth 12, and the outer cloth 12 has a body wearing function (described later).

  The inner cloth 11 is formed in an elongated shape and has a cylindrical shape that can enclose the base material 2. The outer cloth 12 is also formed in an elongated shape, and the inner cloth 11 is wrapped around the central portion of the outer cloth 12, and extends substantially the same length on both sides of the inner cloth 11.

  The dry and wet reversible base material 2 included in the inner cloth 11 is an aggregate of a large number of small pieces 21 (described later) made of a polyvinyl acetal resin porous body (PVAt resin porous body). Polyvinyl acetal resin porous material exhibits excellent water absorption and water content, and at the same time exhibits not only flexibility and rebound resilience when wet, but also does not cause slimming even when absorbed by water. Have. This type of polyvinyl acetal resin porous body is produced by cross-linking a reaction solution comprising polyvinyl alcohol, a pore-forming agent, a cross-linking agent and a cross-linking catalyst, and then removing the pore-forming agent, The smaller the degree of acetalization, the better the water absorption. It is known that the use of a polyvinyl acetal resin porous body containing or adhering a surfactant increases the water absorption rate of the completely dried polyvinyl acetal resin porous body, In the base material 2 using the polyvinyl acetal resin porous material treated with the agent, when immersed in water, the base material 2 becomes sufficiently wet within 1 minute and exhibits a cold keeping action for a long time. Sufficient water absorption is ensured.

  As the small pieces 21 forming the aggregate as the base material 2, those having an arbitrary shape can be used. A specific shape of the usable small piece 21 is shown in FIG. FIG. 2A shows a thin plate-like piece 21 formed in a polygonal shape, FIG. 2B shows a thin plate-like piece 21 formed in a disk shape, and FIG. Show. These are all examples, and of course, a polygonal shape, a disc shape having a distortion, a spherical shape, or the like (not shown) can be used without any problem.

  When the base material 2 is encapsulated in the flexible inner cloth 11 and formed by an aggregate of a large number of small pieces 21, the large number of small pieces 21 can be formed regardless of whether the base material 2 is wet or dry. Since it moves freely in the inner cloth 11, the flexible outer cloth 12 is easily deformed into various shapes even at the central portion surrounding the inner cloth 11. Therefore, the cold insulator A itself has an excellent shape following ability, and when the cold insulator A is attached to the neck or the forehead of the body, a soft wearing feeling that makes it difficult to feel the tightness is obtained. Therefore, even when the wet base material 2 is gradually dried over time while the cooler A is worn on the body, the dry portion of the base material 2 is stiff and a good soft wearing feeling is obtained. It is difficult for the situation to be damaged to occur.

  Further, when the base material 2 is formed of an aggregate of a large number of small pieces 21 of the polyvinyl acetal-based resin porous body, the base material as proposed by the above-mentioned Patent Document 2 is formed in a flat plate shape. Compared to what is present, not only the surface area of the base material 2 is remarkably widened, but also the voids inevitably formed between the small pieces 21 are given to the base material 2, so that the amount of moisture contributing to the cooling action As a result, the cooling effect is increased.

  The small piece 21 made of the polyvinyl acetal resin porous body forming the aggregate as the base material 2 can be manufactured, for example, by the following method. That is, a dry sheet made of a polyvinyl acetal resin porous body having a thickness of about 1 to 2 mm is pulverized to a small size using a pulverizer or the like, or is dried to a thickness of about several mm (for example, 1 to 2 mm). A method of slicing the obtained polyvinyl acetal-based resin porous body into a sheet shape and then processing it into small pieces having an integral volume using a punching machine or the like can be appropriately employed.

In this embodiment, the single small piece 21 forming the aggregate as the base material 2 has an apparent average volume in the range of 1 mm ³ or more and 1000 mm ³ or less. When the apparent average volume of the single small piece 21 included in the aggregate is within this range, not only good and unreasonable shape following ability is exhibited, but also the amount of moisture contributing to the cooling action increases. It has been confirmed that an excellent cooling effect is exhibited.

  The inner cloth 11 and the outer cloth 12 are bonded by hot melt and are sewn in a cylindrical shape. The inner cloth 11 wrapped in the outer cloth 12 has a large number of polyvinyl acetal resin porous bodies. The small pieces 21 are loaded, and an aggregate composed of the loaded small pieces 21 is held in a flat plate shape or a round bar shape by the inner cloth 11. Here, the “flat plate shape or round bar shape” is meant to include shapes such as a flat strip or strip having a thickness of about several millimeters to several tens of millimeters, a circular section or an elliptical section, and an elliptical section. . The amount of the small pieces 21 loaded into the inner cloth 11 is suppressed to such an extent that the elongated bag-shaped inner cloth 11 can be easily flattened, easily bent into an arc shape, or easily bent. It has been.

  Moreover, the both ends of the outer fabric 12 are formed in a pointed shape. The inner cloth 11 is wrapped around the central portion of the outer cloth 12 so as not to be displaced. In FIG. 1, reference numeral 14 indicates a sewing line that joins both ear edges of the outer fabric 12.

  FIG. 3 is an explanatory view showing an enlarged section of a portion along the line III-III in FIG. As shown in the figure, in the central portion of the outer cloth 12, the inner cloth 11 containing the base material 2 that is an aggregate of a large number of small pieces 21 made of a polyvinyl acetal-based resin porous body slides on the outer cloth 12. Overlapping is possible.

  In this embodiment, a non-woven fabric having hydrophilicity is employed for the inner cloth 11. “Hydrophilic” means a property that makes it easy to get wet with water and allows the surface to wet and smoothly penetrate into the interior when immersed in water. Thus, when the nonwoven fabric which has hydrophilicity is employ | adopted for the inner cloth 11, when the base material 2 included in the inner cloth 11 is wetted with water, the penetration | infiltration of water to the base material 2 by the inner cloth 11 will be carried out. Is promoted, and the substrate 2 can be sufficiently wetted in a short time. Moreover, since a general nonwoven fabric is excellent in a softness | flexibility compared with a woven fabric, the shape followability of the base material 2 will be accelerated | stimulated by using a nonwoven fabric for the inner fabric 11. FIG.

  FIG. 4 is a partial plan view illustratively showing the outer cloth 12. In this embodiment, a woven fabric is used for the outer fabric 12 and, as shown in the figure, a large number of ventilations having openings larger than the size of the weave provided in the woven fabric itself are provided in the woven fabric. Mouth 15 is scattered throughout. Although the example in which the vent holes 15 are scattered in a regular arrangement pattern is shown in the figure, the arrangement pattern of the vent holes 15 may be irregular. The outer fabric 12 is a woven fabric made of nylon fibers.

The outer fabric 12 employed in the embodiment employs a woven fabric in which the contact cold / hot feeling evaluation value Qmax falls within the range of the following formula (1) or (2).
Qmax = 0.2W / cm ² (1)
Qmax> 0.2 W / cm ² (2)
W / cm ² represents the amount of heat absorbed per unit area.

  The contact cool / warm feeling evaluation value Qmax is used to evaluate whether the skin surface feels cold or warm when the skin surface touches the outer cloth 12. The larger the contact cool / warm feeling evaluation value Qmax, the lower the cool sensitivity. It has excellent contact coolness, dryness, and wear. It is confirmed that the use of the outer fabric 12 having a contact cold / warm feeling evaluation value Qmax that falls within the range of the formula (1) or (2) provides excellent cold sensitivity, cool contact feeling, dry feeling, etc. during use, and a good wearing feeling. Has been. Nylon woven fabric as the outer fabric 12 that falls within the range of the formula (1) or (2) with the contact cold / warm evaluation value Qmax. More specifically, the product name “Cool-in F” of Toray Industries, Inc. and Unitika Ltd. The product name “Cool Catch Plus” can be suitably used. Generally, these woven fabrics are used for clothing.

  Next, the body wearing function provided in the outer cloth 12 will be described. This body mounting function is used for mounting the cold insulator A on the body.

  FIG. 5 is a schematic perspective view showing an example of a configuration for exerting a body wearing function. In the example of the figure, the loop portion 16 is formed by sewing the ear portions of one end portion of the outer cloth 12 as the holding material 1, and the other end portion of the outer cloth 12 can be inserted into the loop portion 16. I can do it. If it is this structure, when it wants to mount | wear the cold-retaining tool A to a cold-reservation place of a body, for example, a neck, the other end part of the outer fabric 12 wound around the neck is inserted in the said loop part 16, and it is attached to the inner fabric 11. The included base material 2 can be attached without difficulty along the neck. The body wearing function can be imparted to the cold insulator by other means. For example, in the cold insulator A of FIG. 1, the body wearing function is exhibited by connecting both ends of the outer cloth 12. This can also be achieved by sewing a stopper such as a surface fastener to both ends of the outer fabric 12.

  According to the cold insulator A described above, at the time of use, the whole or central portion of the cold insulator A can be immersed in water to wet the substrate 2 and then used immediately by squeezing excess water. At the time of use, the cold-retaining action is caused by the heat of vaporization of moisture from the base material 2 by attaching the cold-retaining tool A to the body so that the base material 2 that has been absorbed and wetted is applied to a place to be kept cold. Is demonstrated. For this reason, it can be used not only for farm work under hot weather, but also for outdoor sports such as golf, and for heat removal during sick fever.

  In addition, since the inner cloth 11 containing the base material 2 is hydrophilic, the base material 2 can be moistened in a short time, and when it is worn on the body, the cooler A wets the clothes or the skin. The body temperature is easily transmitted through the vent 15 of the outer cloth 12 to the base material 2 and the vaporization of the moisture moistening the base material 2 is easily promoted. The cooling effect by heat of vaporization is efficiently exhibited.

  In the above-described cold insulator A, the small piece used for the base material 2 can be a single piece formed of a polyvinyl acetal resin porous body (single layer), and of course, a polyvinyl acetal resin depending on the interlining. It is also possible to use a material that suppresses fragmentation or fine powdering of the porous body.

  FIG. 6 is an explanatory view showing a modification of the small piece. The small piece 21 in the figure is a composite in which an interlining 22 made of a woven fabric is covered with and integrated with polyvinyl acetal resin porous layers 23 and 23. The small piece 21 made of such a composite may be used by mixing with the above-mentioned single layer. Moreover, you may comprise the aggregate | assembly as a base material only with the small piece 21 which consists of composites. If the small piece 21 has the structure including the interlining 22 as shown in FIG. 6, even if the deterioration of the polyvinyl acetal-based resin porous body layer 23 progresses, it separates from the interlining 22 and is separated into small pieces or fine pieces. Since the situation of becoming powder is suppressed, not only the service life of the base material 2 is improved, but also the fine pieces or fine powder separated from the interlining 22 make the non-woven eyes or the outer fabric vents 15 narrow. It is difficult for a piece or fine powder to pass through.

DESCRIPTION OF SYMBOLS A Cold insulator 1 Holding material 2 Base material 11 Inner cloth 12 Outer cloth 15 Vent 21 Small piece of polyvinyl acetal resin porous body 22 Interlining 23 Polyvinyl acetal resin porous body layer

Claims (6)

A wet and dry reversible base material made of a polyvinyl acetal resin porous body is encased in a breathable holding material, and the holding material has a body wearing function for allowing the base material to face a cold-reserved portion of the body. A cooler,
The base material is an aggregate of a large number of small pieces of a polyvinyl acetal resin porous body,
The holding material is composed of an inner cloth that encloses the aggregate and retains the shape of a flat plate or a round bar, and an outer cloth that wraps the inner cloth and extends to both sides of the inner cloth. A cold insulator having a body wearing function and having an outer cloth made of a woven cloth having a large number of ventilation holes formed by openings larger than the size of the weave. The cold insulator according to claim 1, wherein an apparent average volume of a single small piece forming the aggregate is 1 mm ³ or more and 1000 mm ³ or less.   The cold insulator according to claim 1 or 2, wherein the inner cloth is a nonwoven fabric having hydrophilicity.   4. A large number of the vents formed in the outer fabric have a size or a shape that makes it impossible to pass through the individual small pieces forming the aggregate. The cold insulator described in 1.   The individual small pieces forming the aggregate include one in which a woven fabric core is integrated and covered with a polyvinyl acetal resin porous body. Listed cold insulation. 6. The cold insulator according to claim 1, wherein the outer cloth is a woven cloth having a contact cold / warm feeling evaluation value Qmax in a range of the following expression (1) or (2).
Qmax = 0.2W / cm ² (1)
Qmax> 0.2 W / cm ² (2)
W / cm ² represents the amount of heat absorbed per unit area.

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