JP2008212529A - Footwear - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide footwear capable of reducing problems of moisture resistance and heat leak and securing high insulation performance for ages in the foot wear applying a vacuum heat-insulating material to a shoe sole part. <P>SOLUTION: This footwear applies the vacuum heat-insulating material 31, which is formed by covering a plate-like core material 32 having two opposite heat transmission faces, with multilayer-structured exterior cover materials with gas barrier property to decompress the inside of the external cover materials and tightly seal it, to at least either part of a shoe sole part. In the vacuum heat-insulating material 31 applied to the shoe sole part, the gas barrier layer of the external cover material in the shoe sole side is formed by aluminum evaporation 34, the gas barrier layer of the external cover material in the sole side is formed of aluminum foil 36 and a plastic film is disposed in the surface on the shoe sole side of the vacuum heat-insulating material 31 as the cover member. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to footwear to which a vacuum heat insulating material is applied in order to enhance heat insulation.

  Footwear used in cold regions and low-temperature work is desired to be warm and have high heat insulation performance. In order to realize this, a heat-insulating material is applied to the sole of the footwear, and a fabric with long bristle feet that can hold an air layer in the interior material is applied.

On the other hand, as a heat insulating material, a vacuum heat insulating material may be applied in order to ensure high heat insulating performance in a limited space. As the vacuum heat insulating material, a laminate film including a metal foil layer that is difficult to pass gas is generally used in order to keep the inside at a low vacuum (see, for example, Patent Document 1).
JP 2005-137557 A

  However, since the metal foil has a high thermal conductivity, heat flows through the metal foil, and there is a so-called heat leak problem that the heat easily flows between both surfaces of the vacuum heat insulating material.

  Moreover, when metal vapor deposition was used for the gas barrier layer instead of the metal foil, there was a problem that water was easily passed compared to the metal foil and the moisture resistance was inferior.

  The present invention provides footwear in which a vacuum heat insulating material is applied to a shoe sole, and the moisture resistance problem and heat leak problem can be reduced and high heat insulation can be secured over time.

  In order to achieve the above object, the footwear of the present invention has a multilayered structure covering a plate-shaped core material having two heat transfer surfaces facing each other with a gas barrier outer covering material to reduce the pressure inside the outer covering material. The footwear is applied to at least one part of the shoe bottom portion, and the gas barrier layer of the jacket covering the one heat transfer surface of the core is metal vapor deposition, and the core The gas barrier layer of the jacket material covering the other heat transfer surface of the material is a metal foil, and the vacuum heat insulating material is provided on the shoe sole side with the jacket material side having metal vapor deposition as the gas barrier layer.

  In the present invention, metal deposition is used for the gas barrier layer of the jacket material covering one heat transfer surface of the core material, and metal foil is used for the gas barrier layer of the jacket material covering the other heat transfer surface of the core material. The problem of heat leakage can be reduced as compared with the case where the metal barrier is used for the gas barrier layers of both the jacket materials.

  In addition, since the outer jacket material side with the metal vapor deposition as the gas barrier layer is disposed on the shoe sole side, the metal vapor deposition is performed with the gas barrier layer as compared with the case where the outer jacket material side with the metal vapor deposition as the gas barrier layer is disposed on the sole side. It is possible to reduce the amount of water that passes through the outer cover material and enters the vacuum heat insulating material.

  ADVANTAGE OF THE INVENTION According to this invention, in the footwear which applied the vacuum heat insulating material to the shoe-sole part, the footwear which can reduce the problem of moisture resistance and the problem of heat leak, and can ensure high heat insulation over time can be provided.

  The footwear invention according to claim 1 of the present invention is such that a plate-like core material having two heat transfer surfaces facing each other is covered with a gas barrier outer covering material having a multilayer structure, and the inside of the outer covering material is decompressed. The footwear is applied to at least one part of the shoe bottom portion, and the gas barrier layer of the jacket covering the one heat transfer surface of the core is metal vapor deposition, and the core The gas barrier layer of the jacket material covering the other heat transfer surface of the material is a metal foil, and the vacuum heat insulating material is arranged on the shoe sole side with the jacket material side made of metal vapor deposition as a gas barrier layer. .

  Metal vapor deposition can be made thinner than in the case of foil. Therefore, it is possible to reduce the heat that flows through the outer jacket material and flows between both surfaces of the vacuum heat insulating material, and the decrease in the heat insulating effect can be reduced, so that it is possible to provide footwear with a high heat retaining effect.

  In addition, since the outer cover material on one side of the vacuum heat insulating material includes a metal foil, the gas barrier property is high and the increase in internal pressure can be reduced, and the increase in thermal conductivity can be reduced. Therefore, it is possible to provide warm footwear that can ensure high heat insulation over time.

  In the present invention, metal vapor deposition is used for the gas barrier layer of the jacket material covering one heat transfer surface of the core material, and metal foil is used for the gas barrier layer of the jacket material covering the other heat transfer surface of the core material. The problem of heat leakage can be reduced as compared with the case where the metal barrier is used for the gas barrier layers of both the jacket materials.

  The surface of the vacuum heat insulating material disposed on the shoe sole side is in contact with the shoe sole. Therefore, the infiltration of water from the shoe sole side surface of the vacuum heat insulating material can be reduced, and the increase in internal pressure can be reduced, so that the increase in thermal conductivity can be reduced. Therefore, it is possible to provide warm footwear capable of ensuring high heat insulation over time.

  In addition, since the outer jacket material side with the metal vapor deposition as the gas barrier layer is disposed on the shoe sole side, the metal vapor deposition is performed with the gas barrier layer as compared with the case where the outer jacket material side with the metal vapor deposition as the gas barrier layer is disposed on the sole side. It is possible to reduce the amount of water that passes through the outer cover material and enters the vacuum heat insulating material.

  According to a second aspect of the present invention, the footwear invention is the one according to the first aspect, wherein a cover member is disposed on the shoe sole side surface of the vacuum heat insulating material. By attaching the cover member to the surface, the infiltration of water from the surface on the shoe sole side of the vacuum heat insulating material can be reduced. Therefore, it is possible to provide warm footwear capable of ensuring high heat insulation over time.

  In addition, the puncture resistance is improved, so that even if protrusions such as pebbles enter the footwear, the outer jacket material is less likely to be damaged, and the increase in the internal pressure of the vacuum heat insulating material can be reduced, thus increasing the thermal conductivity. Can be reduced.

  Further, the footwear invention according to claim 3 is the invention according to claim 1 or 2, wherein the position of the seal portion of the outer jacket material around the core material where the outer jacket materials are heat-welded is the core. In the thickness direction of the material, it is provided at a position near the heat transfer surface on the shoe sole side of the core material, and since the seal part of the vacuum heat insulating material approaches the surface on the shoe sole side, the shoe sole and the vacuum heat insulating material are more It becomes difficult for the air to go around between. Therefore, the infiltration of water from the shoe sole side surface of the vacuum heat insulating material can be reduced, and the increase in internal pressure can be reduced, so that the increase in thermal conductivity can be reduced. Therefore, it is possible to provide warm footwear capable of ensuring high heat insulation over time.

  Further, the footwear invention according to claim 4 is the invention according to any one of claims 1 to 3, further comprising a moisture adsorbing material covered with a core material together with a core material, wherein the moisture adsorbing material is Since it is disposed at a location corresponding to the position of the arch and water that has entered the inside of the vacuum heat insulating material can be adsorbed by the moisture adsorbing material, an increase in internal pressure can be reduced. Therefore, an increase in thermal conductivity can be reduced. Therefore, it is possible to provide warm footwear capable of ensuring high heat insulation over time. Moreover, although the thickness of the place where the moisture adsorbing material is put becomes thick, the uncomfortable feeling when put on can be eased by putting it in the position of the arch.

  Further, the footwear invention according to claim 5 is the invention according to any one of claims 1 to 4, wherein the vacuum heat insulating material is at least a contact portion between the heat transfer surface of the core material and the jacket material. A part is heat-welded, and a portion where the jacket materials around the core material are closely adhered to each other at atmospheric pressure is heat-sealed along the periphery of the core material, and the shape of the vacuum heat insulating material is It can be formed so as to match the substantially foot shape and the shape of the sole of the footwear. Therefore, comfortable footwear can be provided.

  The footwear invention according to claim 6 is the invention according to any one of claims 1 to 5, wherein the core material of the vacuum heat insulating material has a substantially foot shape and is positioned around the core material. The non-core material part without the core material between the outer cover materials and the outer cover materials being heat-welded with each other has a substantially foot shape, and the non-core material part without the core material can be made smaller and effective heat insulation can be achieved. Increases area. Therefore, the heat insulation performance can be improved while forming so as to match the substantially foot shape and the shape of the shoe sole of the footwear.

  The footwear invention according to claim 7 is the invention according to any one of claims 1 to 6, wherein the core material of the vacuum heat insulating material has a thickness of 1 mm or more and 5 mm or less. Since the core material is as thin as 1 mm or more and 5 mm or less, a vacuum heat insulating material can be applied even to footwear in which it is difficult to secure a space.

  The footwear is not particularly specified including sports shoes such as boots, boots, boots, sandals, slippers, and ski shoes. Further, the insole of footwear is used by being attached to the shoe sole of the footwear, and basically refers to a material that can be arbitrarily attached and detached.

  In addition, the vacuum heat insulating material is a material in which a core material with a high gas phase ratio, which is an aggregate, is covered with an outer covering material such as a gas barrier film or container, and the inside is vacuum-sealed, and the inside is made into a vacuum state. Refers to a heat insulating material with reduced heat conduction of gas components.

  Explaining the constituent material of the vacuum heat insulating material, the material used for the core material is a porous body having a gas phase ratio of about 90% processed into a sheet or plate shape, and can be used industrially. Body, powder, and fiber body. These can use a well-known material according to the use use and required characteristic.

  Among these, as the foam, open-cell bodies such as urethane foam, styrene foam, and phenol foam can be used, but those having high heat resistance are preferable.

  As the powder, inorganic, organic, and mixtures thereof can be used, but industrially, those mainly composed of dry silica, wet silica, pearlite and the like are more desirable.

  As the fibrous body, inorganic, organic, and mixtures thereof can be used, but inorganic fibers are advantageous from the viewpoint of cost and heat insulation performance. As an example of the inorganic fiber, a known material such as glass wool, glass fiber, alumina fiber, silica alumina fiber, silica fiber, rock wool, or the like can be used.

  A laminate film having a metal foil or a metal vapor-deposited layer can be applied to the laminate film used for the jacket material, and the use of a plastic laminate film has a great merit in terms of productivity and cost.

  Embodiments of the present invention will be described below with reference to the drawings. The present invention is not limited to the embodiments.

(Embodiment 1)
In the present embodiment, a short boot will be described as an example of footwear. FIG. 1 is a side view of a shoe according to Embodiment 1 of the present invention, and FIG. 2 is a cross-sectional view of the shoe according to Embodiment 1 of the present invention. FIG. 3 is a cross-sectional view of the vacuum heat insulating material applied to the shoe in Embodiment 1 of the present invention.

  In FIG. 1, a shoe 11 is configured such that a bottom portion 12, an upper portion 13, a front surface portion 14, a rear surface portion 15, and a side surface portion 16, which wrap around a foot, are joined to a rubber shoe sole 17. As shown in FIG. 2, the bottom 12 is formed by laminating a plastic film 21, a vacuum heat insulating material 31, and an elastomer 22 with a cloth as a cover member.

  Here, it is desirable that the cover member (plastic film 21) is in close contact with the vacuum heat insulating material 31, and it is desirable that the cover member (plastic film 21) is closely adhered and fixed by an adhesive such as an adhesive or a tape. Moreover, although the plastic film was mentioned as an example, the laminate film comprised from the several layer may be sufficient. Further, the cover member (plastic film 21) may be disposed by applying a moisture permeable member, for example, a material such as silicon or epoxy.

  The structure of the vacuum heat insulating material 31 shown in FIG. 3 is obtained by covering a 4 mm thick core material 32 made of a glass wool molded body cut into a substantially foot shape with a covering material made of a gas barrier laminate film. The inside of the material is decompressed.

  The laminate film (coating material) on the sole side is composed of a 25 μm nylon film 33 as a protective layer from the outermost layer, an aluminum vapor deposition 34 as a gas barrier layer, and a 30 μm polyethylene 35 as a heat welding layer. The laminated film (cover material) on the shoe sole side is composed of a 25 μm nylon film 33 as a protective layer, a 6 μm aluminum foil 36 as a gas barrier layer, and a 30 μm polyethylene 35 as a heat welding layer from the outermost layer. . The laminate film (outer coating material) is particularly preferably excellent in bending resistance, and known materials can be applied.

  Furthermore, the vacuum sealing method of this vacuum heat insulating material 31 is demonstrated in detail.

  First, in a vacuum chamber having a hot plate in which an elastic body is bonded to the surface layer so as to easily follow the shape of the core material 32, on substantially the same plane between two gas barrier laminate films (cover materials), A plurality of core members 32 are arranged apart from each other, reduced in pressure to a predetermined pressure, and then heated and pressurized including a portion where the core member 32 is provided between the jacket materials, so that the opposing heat-welded layers 35 are interposed between the core members. The vacuum heat insulating material 31 is manufactured by heat-welding along the shape of the core material 32 except for a portion where 32 is present. When the vacuum heat insulating material 31 is formed by such a vacuum sealing method, the heat welded portion 37 is formed so as to follow the periphery of the core material 32, so that a non-core material portion without the core material 32 between the outer jacket materials is more formed. Get smaller.

  With the configuration as described above, the shoe 11 according to the first embodiment effectively keeps the body heat generated by the human body and blocks the outside air by the excellent heat insulating action of the vacuum heat insulating material 31 that covers most of the shoe bottom. The foot can be kept warm in a cold environment.

  The aluminum vapor deposition 34 can be formed thinner than the aluminum foil 36. Therefore, it is possible to reduce the heat that flows through the outer jacket material and flows between both surfaces of the vacuum heat insulating material 31, and the decrease in the heat insulating effect can be reduced. Therefore, it is possible to provide footwear with a high heat retaining effect. In addition, since the outer cover material on one side of the vacuum heat insulating material 31 includes the aluminum foil 36, the gas barrier property is high and the increase in internal pressure can be reduced, so that the increase in thermal conductivity can be reduced. it can. Therefore, it is possible to provide warm footwear that can ensure high heat insulation over time.

  Further, by attaching a cover member (plastic film 21), water intrusion from the surface of the vacuum heat insulating material 31 can be reduced. Therefore, it is possible to provide warm footwear (shoes 11) that can ensure high heat insulation over time. When the cover member (plastic film 21) is disposed in close contact with the vacuum heat insulating material 31, it is better because water intrusion can be further reduced. Further, since the puncture resistance is improved, even if a projection such as pebbles enters the footwear (shoes 11), the outer cover material is hardly damaged and the increase in the internal pressure of the vacuum heat insulating material 31 can be reduced. An increase in conductivity can be reduced.

  Further, the surface of the vacuum heat insulating material 31 disposed on the shoe sole side is in contact with the shoe sole. Therefore, water intrusion from the shoe sole side surface of the vacuum heat insulating material 31 can be reduced, and an increase in internal pressure can be reduced, so that an increase in thermal conductivity can be reduced. Therefore, it is possible to provide warm footwear capable of ensuring high heat insulation over time.

  In addition, the bending direction of the vacuum heat insulating material 31 applied to the shoe sole portion of footwear is characterized by only one side direction, and a load is strongly applied in the direction in which the outer covering material on the shoe sole side is extended by walking. Therefore, by arranging the aluminum vapor deposition 34 configuration on the shoe sole side laminate film, the aluminum vapor deposition 34 is easier to extend than the aluminum foil 36, so it is possible to suppress the occurrence of film cracks and the like of the shoe sole side laminate film. The bending durability of the vacuum heat insulating material 31 is improved.

  In the footwear (shoe 11) of the present embodiment, a plate-shaped core member 32 having two heat transfer surfaces facing each other is formed from the outermost layer to a protective layer (nylon film 33), a gas barrier layer (aluminum vapor deposition 34 or aluminum foil 36). ), A vacuum heat insulating material 31 having a multilayer structure comprising a heat-welding layer (polyethylene 35) as the innermost layer, covered with a gas barrier outer covering material, and the inside of the outer covering material being decompressed and sealed, at least on any of the shoe soles The footwear (shoe 11) applied to the location, the gas barrier layer of the jacket covering the one heat transfer surface of the core member 32 is metal vapor deposition (aluminum vapor deposition 34), and the other heat transfer surface of the core member 32 The gas barrier layer of the covering material covering the metal is a metal foil (aluminum foil 36), and the vacuum heat insulating material 31 is provided with the metal covering (aluminum evaporation 34) as the gas barrier layer on the shoe sole side. It is.

  The metal vapor deposition (aluminum vapor deposition 34) can be formed thinner than the metal foil (aluminum foil 36). Therefore, it is possible to reduce the heat that flows between the both surfaces of the vacuum heat insulating material 31 through the outer jacket material, and the decrease in the heat insulating effect can be reduced, thereby providing footwear (shoe 11) having a high heat retaining effect. be able to.

  Further, since the outer cover material on one side of the vacuum heat insulating material 31 includes the metal foil (aluminum foil 36), the gas barrier property is high and the increase in internal pressure can be reduced, and the increase in thermal conductivity is reduced. be able to. Therefore, the warm footwear (shoe 11) which can ensure high heat insulation over time can be provided.

  In the present embodiment, metal vapor deposition (aluminum vapor deposition 34) is used for the gas barrier layer of the jacket material covering one heat transfer surface of the core member 32, and the other cover material covering the other heat transfer surface of the core member 32 is covered. Since the metal foil (aluminum foil 36) is used for the gas barrier layer, the problem of heat leakage can be reduced as compared with the case where the metal foil is used for the gas barrier layer of both jacket materials.

  In addition, since the jacket material side with metal vapor deposition (aluminum vapor deposition 34) as the gas barrier layer is arranged on the shoe sole side, the jacket material side with metal vapor deposition (aluminum vapor deposition 34) as the gas barrier layer is arranged on the sole side. The amount of water that enters the vacuum heat insulating material 31 through the jacket material in which metal vapor deposition (aluminum vapor deposition 34) is used as the gas barrier layer can be reduced as compared with the case where the above is performed.

  Further, the footwear (shoe 11) of the present embodiment is such that a cover member (plastic film 21) is disposed on the surface of the vacuum heat insulating material 31 on the shoe bottom side, and the surface of the vacuum heat insulating material 31 on the shoe bottom side. By attaching a cover member (plastic film 21) to the bottom, it is possible to reduce the intrusion of water from the shoe sole side surface of the vacuum heat insulating material 31. Therefore, it is possible to provide warm footwear capable of ensuring high heat insulation over time.

  Moreover, since the piercing resistance is improved by the cover member (plastic film 21), even if a projection such as pebbles enters the footwear (shoes 11), the outer cover material is hardly damaged, and the internal pressure of the vacuum heat insulating material 31 is increased. Therefore, an increase in thermal conductivity can be reduced.

  Further, in the present embodiment, the vacuum heat insulating material 31 has at least a part of the contact portion between the heat transfer surface of the core material 32 and the outer cover material, and the outer cover material around the core material 32 is large. The portion that is in close contact with the atmospheric pressure is heat-sealed along the periphery of the core member 32, and the shape of the vacuum heat insulating material 31 matches the substantially foot shape and the shoe bottom shape of the footwear (shoe 11). Can be molded. Therefore, it is possible to provide comfortable footwear (shoe 11).

  Further, in the present embodiment, the core material 32 of the vacuum heat insulating material 31 has a substantially foot shape, is located around the core material 32, and there is no core material 32 between the jacket materials. The non-core material portion thus formed has a substantially foot shape, so that the non-core material portion without the core material 32 can be reduced, and the effective heat insulation area is increased. Therefore, the heat insulation performance can be enhanced while forming so as to match the substantially foot shape and the shoe bottom shape of the footwear (shoe 11).

  Further, when the core material 32 of the vacuum heat insulating material 31 has a thickness of 1 mm or more and 5 mm or less, the vacuum heat insulating material 31 is used even for footwear (shoes 11) in which space is difficult to secure because the core material 32 is as thin as 1 mm or more and 5 mm or less. Can be applied.

(Embodiment 2)
FIG. 4 is a cross-sectional view of a vacuum heat insulating material applied to a shoe in Embodiment 2 of the present invention. The specification of the shoe 11 is the same as that of the first embodiment, and the description is omitted.

  The configuration of the vacuum heat insulating material 31 shown in FIG. 4 is different from that of the first embodiment in that the position of the sealing portion (thermal welding portion 37) of the outer jacket material around the core material 32 where the outer jacket materials are thermally welded to each other. In the thickness direction of the core member 32, the core member 32 is provided at a position near the heat transfer surface on the shoe sole side, and the seal portion (thermal welding portion 37) of the vacuum heat insulating material 31 is on the shoe sole side surface. Since it approaches, air becomes difficult to wrap around between the shoe sole and the vacuum heat insulating material 31. Therefore, water intrusion from the shoe sole side surface of the vacuum heat insulating material 31 can be reduced, and an increase in internal pressure can be reduced, so that an increase in thermal conductivity can be reduced. Therefore, it is possible to provide warm footwear (shoes 11) that can ensure high heat insulation over time.

  It is ideal that the position of the seal portion (thermal welding portion 37) is close to the entire vacuum heat insulating material 31, but the above effect can be obtained if it is close to at least the periphery of the core portion 32. As the degree of deviation, the distance between the seal part (thermal welding part 37) and one surface of the vacuum heat insulating material 31 in the entire thickness of the vacuum heat insulating material 31 may be less than 50%. If it is less than 40%, the above-mentioned effect can be obtained remarkably.

(Embodiment 3)
FIG. 5 is a plan view of a vacuum heat insulating material applied to a shoe in Embodiment 3 of the present invention, and FIG. 6 is a cross-sectional view of the vacuum heat insulating material applied to a shoe in Embodiment 3 of the present invention.

  5 and 6, the difference from the first embodiment is that a moisture adsorbing material 38 is disposed inside the vacuum heat insulating material 31. The moisture adsorbing material 38 is disposed at a position corresponding to the position of the arch.

  On the other hand, what was shape | molded by the method similar to Embodiment 1 is applied to the vacuum heat insulating material 31. FIG.

  With the configuration as described above, water that has entered the inside of the vacuum heat insulating material 31 can be adsorbed, so that an increase in internal pressure can be reduced. Therefore, since an increase in thermal conductivity can be reduced, it is possible to provide warm footwear that can ensure high heat insulation over time.

  Moreover, although the thickness of the part which put the adsorbent 38 becomes thick, the uncomfortable feeling at the time of putting on can be eased by putting in arch.

(Embodiment 4)
FIG. 7 is a cross-sectional view of a shoe insole according to Embodiment 4 of the present invention.

  In FIG. 7, a shoe insole 51 is configured by pasting an elastomer 52 with a cloth on the surface (surface on the sole side) of the vacuum heat insulating material 31 and a plastic film 53 on the back surface (surface on the shoe sole side). ing.

  On the other hand, what was shape | molded by the method similar to Embodiment 1 is applied to the vacuum heat insulating material 31. FIG.

  With the configuration as described above, the shoe insole 51 has a high heat retaining performance while having the same thickness as the conventional shoe insole due to the excellent heat insulating performance of the vacuum heat insulating material 31.

  In this way, even if the heat retention performance is high, the insole of the shoe is thin, the size and appearance are not significantly changed from those of the conventional insole, and it can be used without being influenced by the shape of the shoe or the type of shoe. .

  Furthermore, since the insole is attached to the vacuum heat insulating material 31 and the insole is enhanced, the wearing and removing can be arbitrarily selected according to the climate and temperature. Furthermore, since it is excellent in flexibility and bending durability, it is an insole excellent in comfort and economy, and a wide range of uses can be expected.

  In addition, regarding the thickness of 32 parts of the core material of the vacuum heat insulating material 31, by increasing the thickness, it is possible to provide an insole for shoes having higher heat retention performance, and it can be expected to be applied in more severe cold regions. However, if it is too thick, the user feels uncomfortable during walking, so it is preferably 10 mm or less, and more preferably 5 mm or less. On the other hand, when the thickness is too thin, the heat insulating performance is insufficient or the aging characteristics of the heat insulating performance are deteriorated, so that 1 mm or more is desirable.

  As described above, the vacuum heat insulating material according to the present invention, and the footwear and the insole of the footwear to which the vacuum heat insulating material is applied are effective in keeping the body heat and blocking the cold air by applying the vacuum heat insulating material having excellent heat insulating performance. In addition, the vacuum heat insulating material has a high heat insulating effect even if it is formed thin, so that it can be applied not only to the shoes shown in the embodiment of the present invention but also to footwear that does not normally have heat insulating properties such as slippers. As a result, it is possible to ensure cold protection and improve comfort.

Side view of the shoe in Embodiment 1 of the present invention Sectional drawing of the shoes in Embodiment 1 of this invention Sectional drawing of the vacuum heat insulating material applied to the shoes in Embodiment 1 of this invention Side view of the vacuum heat insulating material applied to the shoe in Embodiment 2 of this invention The top view of the vacuum heat insulating material applied to the shoes in Embodiment 3 of this invention Sectional drawing of the vacuum heat insulating material applied to the shoes in Embodiment 3 of this invention Sectional drawing of the insole applied to the shoes in Embodiment 4 of this invention

Explanation of symbols

11 Shoes (footwear)
21 Plastic film (cover member)
31 Vacuum insulation material 32 Core material 33 Protective layer 34 Aluminum vapor deposition (metal vapor deposition)
35 Heat welding layer 36 Aluminum foil (metal foil)
37 Sealing part (thermal welding part)
38 Moisture absorbing material

Claims (7)

  A vacuum heat insulating material in which a plate-like core material having two opposed heat transfer surfaces is covered with a gas barrier outer covering material in a multilayer structure and the inside of the outer covering material is decompressed and sealed is at least one of the shoe bottoms The footwear applied to the portion of the core material is a metal vapor-deposited gas barrier layer covering the one heat transfer surface of the core material, and the outer cover material covering the other heat transfer surface of the core material. Footwear in which the gas barrier layer is a metal foil, and the vacuum heat insulating material is disposed on the shoe sole side on the outer cover material side where metal vapor deposition is used as the gas barrier layer.   The footwear according to claim 1, wherein a cover member is disposed on a shoe sole side surface of the vacuum heat insulating material.   The position of the seal portion of the outer jacket material around the core material where the outer jacket materials are thermally welded is provided at a position near the heat transfer surface on the shoe sole side of the core material in the thickness direction of the core material. Item 3. Footwear according to item 1 or 2.   The footwear according to any one of claims 1 to 3, further comprising a moisture adsorbing material covered with a covering material together with a core material, wherein the moisture adsorbing material is disposed at a position corresponding to an arch position.   The vacuum heat insulating material is such that at least a part of the contact portion between the heat transfer surface of the core material and the jacket material is heat-welded, and a portion where the jacket material around the core material is in close contact with each other at atmospheric pressure is the core material. The footwear according to any one of claims 1 to 4, wherein the footwear is heat-welded along a peripheral edge of the footwear.   The core material of the vacuum heat insulating material has a substantially foot shape, and the non-core material portion that is located around the core material and does not have the core material between the jacket materials and is heat-sealed with the jacket materials is substantially the foot. The footwear according to any one of claims 1 to 5, which has a mold shape.   The footwear according to any one of claims 1 to 6, wherein the core material of the vacuum heat insulating material has a thickness of 1 mm to 5 mm.

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