JP2007244843A - Vacuum heat insulation material, and footgear and insole for footgear using the vacuum heat insulation material - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vacuum heat insulation material to be applied to a bottom part of footgear, capable of securing high heat insulation performance by enlarging effective heat insulation area, while achieving sufficient bendability and bending durability at the same time, so that warm and comfortable footgear, and insoles for footgear are provided. <P>SOLUTION: The vacuum heat insulation material 31 comprises a core material part 32, roughly shaped like a foot, and a non-core material part 34, heat-bonded along the periphery of the core material part 32, and cut into a roughly foot-like form. A plurality of grooves are provided as a bendable part 35 in a surface of the vacuum heat insulation material 31 to follow bending of the bottom part 17 of the footgear when a user is walking. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to footwear to which a vacuum heat insulating material is applied in order to enhance heat insulation, and an insole for footwear to which the vacuum heat insulating material is applied.

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

  On the other hand, a vacuum heat insulating material may be applied as a heat insulating material in order to ensure high heat insulating performance in a limited space.

  However, since the vacuum heat insulating material is vacuum packaged with a gas barrier film having no stretchability in order to maintain the degree of vacuum, the vacuum heat insulating material has poor flexibility and does not have flexibility. Therefore, as a method for imparting flexibility to the vacuum heat insulating material, there is a vacuum heat insulating material in which a plurality of core members are vacuum-sealed to constitute flexibility (see, for example, Patent Document 1). .

  FIG. 13 is an external view of a conventional vacuum heat insulating material. In FIG. 13, the vacuum heat insulating material 1 has a configuration in which a heat insulating space holding material 3 is vacuum sealed in a container 2 made of a plastic film and a film obtained by laminating a metal foil or a metal vapor deposition film. Since the heat insulating space holding member 3 is composed of small pieces 31a, 31b,..., 32a, it can be easily bent around the line 4 between the small pieces even when bending stress is applied.

  With this configuration, the streak 4 between the small pieces of the heat insulating space retaining member 3 becomes a fold, and can be easily bent with respect to the bending stress.

Here, the vacuum heat insulating material is a container or film that covers the heat insulating space holding material and is vacuum-sealed. The performance is improved.
JP-A 61-173931

  In the above-described conventional configuration, the container 2 can be bent around the streak 4 between the small pieces of the heat insulating space holding member 3, but the heat insulating space holding member 3 that is a core material is formed at the streak 4 between the small pieces. Since there is no heat insulation, there is no heat insulation, and heat leakage from the streak 4 is large. In addition, there is a problem that the effective heat insulation area is reduced by the amount of the ineffective heat insulation portion including the lines 4 and sufficient heat insulation performance cannot be obtained.

  In addition, it is necessary to arrange a plurality of heat insulating space holding materials 3, and a problem that the manufacturing cost increases because many man-hours are required for the arrangement of the heat insulating space holding materials 3 and the positioning at the time of arrangement. was there.

  The present invention provides a vacuum heat insulating material that has a high heat insulating property by increasing an effective heat insulating area, and at the same time has sufficient flexibility and bending durability in a vacuum heat insulating material applied to the bottom of footwear. Thus, it provides warm and comfortable footwear and an insole for the footwear.

  In order to achieve the above object, at least a part of the contact portion between the heat transfer surface of the core material and the outer cover material is thermally welded to the vacuum heat insulating material applied to the bottom of the footwear, and the outer periphery around the core material A vacuum heat insulating material that is sealed under reduced pressure by heat-welding the workpiece along the shape of the core material is used.

  Here, the vacuum heat insulating material in the present invention has a core portion having a substantially foot shape, and a non-core portion thermally welded along the periphery of the core portion has a substantially foot shape. In addition, it is preferable to provide a plurality of groove-like recesses as bent portions on the surface of the vacuum heat insulating material so as to follow the bending of the footwear bottom during walking.

  The present invention secures high heat insulation by increasing the effective heat insulation area, and at the same time provides a vacuum heat insulating material having sufficient flexibility and bending durability, so that the footwear is warm and comfortable to wear. And insole for footwear.

  The footwear invention according to claim 1 of the present invention is a vacuum heat insulating material in which a plate-shaped core material having two opposing heat transfer surfaces is covered with a gas barrier outer covering material, and the inside is decompressed and sealed. The footwear applied to at least any part of the bottom, wherein the vacuum heat insulating material has at least a part of a contact portion between the heat transfer surface of the core material and the jacket material, and the core. Footwear is constructed by heat-sealing the jacket material around the material so as to conform to the shape of the core material, and sealing it under reduced pressure.

  Since the vacuum insulation material is heat-sealed around the core material so as to conform to the shape of the core material and sealed under reduced pressure, the non-core material part without the core material can be made smaller, so that the heat insulation performance can be reduced. The core part which has can be taken large and an effective heat insulation area becomes large. Moreover, since the shape of a vacuum heat insulating material can be shape | molded so that it may match substantially foot shape and the bottom part shape of footwear, the footwear of comfortable footwear can be provided.

  The footwear invention according to claim 2 is the invention according to claim 1, wherein the position of the seal portion of the outer jacket material around the core material where the outer jacket materials are thermally welded is the thickness direction of the core material. Then, it is provided at a position near one heat transfer surface of the core material, and the position of the seal part in the thickness direction of the core material is approximately in the middle of the heat transfer surfaces on both sides of the core material. Thus, the gap between the seal portion and the heat transfer surface of the core member close to the seal portion is narrowed, and the jacket material on the side where the seal portion of the vacuum heat insulating material is close approaches a flat surface.

  When the bending and restoration of the vacuum heat insulating material are repeated during walking, the load applied to the jacket material is smaller when the bending restoration is repeated from the two-dimensional state as a plane than when the bending restoration is repeated from the three-dimensional state. This is because a strong load is locally applied by bending the three-dimensional jacket material. Therefore, the occurrence of film cracks and the like due to bending can be suppressed, and the bending durability of the vacuum heat insulating material is improved.

  In addition, the direction in which the vacuum heat insulating material applied to the bottom portion bends is characterized by only the one-side direction, and there is a difference in the load on both surfaces of the vacuum heat insulating material. Therefore, by bringing the seal portion to one side in accordance with the specifications and usage pattern of footwear, it is possible to suppress the occurrence of film cracks due to bending, and the bending durability of the vacuum heat insulating material is improved.

  In the footwear invention according to claim 3, the position of the seal portion in the invention according to claim 2 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. When the vacuum heat insulating material is bent during walking, the outer cover material on the shoe sole side is stretched, so that a heavy load is applied. In view of this, in the present invention, the position of the seal portion 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.

  Therefore, it becomes possible to suppress the occurrence of film cracks and the like of the shoe-side outer covering material that is heavily loaded by bending and restoration during walking, and the bending durability of the vacuum heat insulating material is improved.

  In addition, there will be a gap between the sole and the seal, so shock absorbers, deodorants, dehumidifiers, etc. can be put in this gap, not only for heat insulation performance, but also in a limited space As a result, additional functions can be added. Moreover, since it can arrange | position to the sole side, it is excellent in a dehumidification efficiency and an impact-absorbing property.

  In the footwear invention according to claim 4, the bending of the bottom portion is performed so as to follow the bending of the bottom portion during walking with respect to the vacuum heat insulating material according to any one of claims 1 to 3. A plurality of groove-like recesses are provided in any part corresponding to the part and its peripheral part.

  Since the bottom part of footwear bends every time it walks, it is necessary to bend the vacuum heat insulating material arrange | positioned in the bottom following this. Therefore, the vacuum heat insulating material disposed at the bottom of the footwear is provided with a plurality of groove-like recesses at any location corresponding to the bent portion of the bottom and its peripheral portion.

  Therefore, even when the bottom of the footwear is repeatedly bent and restored during walking, the vacuum heat insulating material can follow the bottom and repeat the bending and restoration. In addition, since multiple groove-shaped recesses are provided, the stress on the film during bending is dispersed, so it is possible to suppress the occurrence of film cracks due to bending, and the bending durability of the vacuum heat insulating material is improved. To do.

  Furthermore, since the core having heat insulation performance exists in the groove-shaped recess, the heat insulation performance is not impaired.

  For these reasons, it is possible to provide footwear with excellent heat insulation performance and comfort.

  According to a fifth aspect of the present invention, the groove-like recess of the vacuum heat insulating material according to the fourth aspect of the present invention forms the vacuum heat insulating material, and then the core material portion of the vacuum heat insulating material together with the jacket material. The groove-shaped concave portion is formed by pressing, and the groove-shaped concave portion is a decompressed space continuous with the adjacent core portion.

  Therefore, it is not necessary to arrange a plurality of core members or positioning with respect to the core member arrangement in order to form the groove-shaped recess, and the man-hour can be greatly reduced, so that footwear to which a vacuum heat insulating material is applied can be provided at low cost. be able to. In addition, since the groove-shaped recess is a decompressed space that is continuous with the adjacent core member, the volume of the gas phase can be increased and the aging characteristics of the heat insulation performance can be improved.

  According to a sixth aspect of the present invention, the groove-like recess of the vacuum heat insulating material according to the fourth or fifth aspect of the invention is formed on the surface on the sole side.

  The bottom of the footwear is repeatedly bent and restored each time it walks, but the bending direction during walking is bent so that the instep of the foot approaches the toes with the joint near the base of the toes as the center. Therefore, the vacuum heat insulating material arranged at the bottom of the footwear needs to be bent similarly.

  Therefore, by providing a groove-like recess on the surface of the sole of the vacuum heat insulating material, when the vacuum heat insulating material is bent, the opposing core material is less likely to interfere through the groove-shaped recess provided in the vacuum heat insulating material. Therefore, it greatly contributes to improvement in flexibility and improvement in bending durability.

  Further, by providing a plurality of groove-like recesses, the flexibility and bending durability of the vacuum heat insulating material are further improved. Therefore, the comfort of the footwear is good.

  The footwear invention according to claim 7 is the heat transfer surface of the core material in which the groove-like recess of the vacuum heat insulating material according to any one of claims 4 to 6 is close to the seal portion. And formed on the opposite surface.

  Since the jacket material in contact with the heat transfer surface of the core member on the side where the seal portion is approaching approaches a two-dimensional plane, the load due to bending during walking is reduced. However, since the other jacket material is in a direction away from the plane, the load due to bending during walking increases. In view of this, in the present invention, a groove-like recess is formed on the surface opposite to the heat transfer surface of the core member where the seal portion is offset.

  Therefore, by providing a plurality of groove-like recesses, the load on the jacket material during bending is dispersed, so it is possible to suppress the occurrence of film cracks and the like due to bending on both sides of the vacuum heat insulating material, The bending durability of both sides of the vacuum heat insulating material is improved.

  Moreover, the direction in which the vacuum heat insulating material applied to the bottom part bends is only in the single-sided direction, and the vacuum heat insulating material is easily bent in the surface side where the concave portion is provided. Therefore, flexibility is also obtained while improving the bending durability of both sides of the vacuum heat insulating material.

  In the footwear invention according to claim 8, the groove-like recesses of the vacuum heat insulating material according to any one of claims 4 to 6 are formed on both sides of the vacuum heat insulating material. It is.

  Therefore, the stress on the outer cover material at the time of bending is dispersed on both sides of the vacuum heat insulating material, and it becomes possible to suppress the occurrence of film cracks and the like due to the bending, and the bending durability on both sides of the vacuum heat insulating material is improved.

  The invention of the footwear according to claim 9 is the invention according to any one of claims 4 to 8, wherein the portion of the vacuum heat insulating material in which the groove-shaped recess is formed is made of other vacuum heat insulating material. The thickness of the vacuum heat insulating material is smaller than that of the other vacuum heat insulating material.

  Therefore, the feeling of fit is improved and the comfort is improved by the fact that the base of the sole of the foot is within the thin part of the vacuum heat insulating material.

  In addition, since the outer cover material approaches a flat surface because it is thin, it is possible to reduce the load applied to the outer cover material when the bending and restoration during walking are repeated, and the bending durability of both sides of the vacuum heat insulating material is improved.

  In the footwear invention according to claim 10, a plurality of groove-like recesses of the vacuum heat insulating material according to any one of claims 4 to 9 are arranged substantially in parallel. Is.

  By providing a plurality of groove-like recesses and arranging the plurality of groove-like recesses to be substantially parallel to each other, the bending at the time of bending is not concentrated on one groove-like recess. It was found to be dispersed in the book.

  As a result, the bending stress at the time of bending acts without being concentrated in one place of the film, so that the bending durability of the vacuum heat insulating material is improved.

  The invention of the insole of footwear according to claim 11 is configured by bonding a cover material to either the front surface or the back surface of the vacuum heat insulating material according to any one of claims 1 to 10. .

  If the vacuum heat insulating material is arranged at the bottom of the footwear and integrated with the footwear, it becomes uncomfortable when the footwear is used under warm conditions. Therefore, by attaching an exterior material to the vacuum heat insulating material and using it as an insole for footwear, it is possible to remove and attach it according to the climate and temperature.

  The invention of the insole of the footwear according to claim 12 is the invention according to claim 11, wherein the core portion of the vacuum heat insulating material has a substantially foot shape and is heat-welded so as to follow the periphery of the core portion. The non-core material portion has a substantially foot shape.

  Since the vacuum heat insulating material according to any one of claims 1 to 10 is heat-sealed so as to follow the shape of the core material around the core material and sealed under reduced pressure, The non-core material portion that is not present can be reduced, and the effective heat insulation area is increased. Therefore, the heat insulation performance can be improved while molding so as to match the substantially foot shape and the bottom shape of the footwear.

  Therefore, the size and appearance of the conventional insole are not significantly changed, and it can be used without being influenced by the shape of the shoe, the type of the shoe, or the like.

  In addition, since it is excellent in flexibility and bending durability, it is possible to provide an insole excellent in comfort and economy.

  Invention of the vacuum heat insulating material of Claim 13 is a vacuum heat insulating material as described in any one of Claim 1-11, Comprising: The core material part of the said vacuum heat insulating material is 1 mm or more and 5 mm or less in thickness. The vacuum heat insulating material is such that the core material portion has a substantially foot shape, and the non-core material portion heat-welded along the periphery of the core material portion has a substantially foot shape.

  For the same reason as described above, the vacuum heat insulating material is excellent in heat insulating properties, bendability, and bending durability, and can be effectively applied as a bottom heat insulating material for footwear and a heat insulating material for an insole of footwear.

  Further, since the heat insulating material is as thin as 1 mm or more and 5 mm or less, it can be used without any problem even if it is difficult to secure a space, or even an insole for footwear.

  Here, 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 bottom of the footwear, and basically refers to something 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. , Powder, and fibrous 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. 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 longitudinal sectional view of the shoe according to Embodiment 1 of the present invention. FIG. 3 is a top view of the vacuum heat insulating material applied to the shoe in Embodiment 1 of the present invention, and FIG. 4 is a side 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 protective plastic film 21, a vacuum heat insulating material 31, and an elastomer 22 with a cloth, but it is general purpose except that the vacuum heat insulating material 31 is applied. Shoes.

  The structure of the vacuum heat insulating material 31 shown in FIG. 3 and FIG. 4 is a gas barrier property in which a plate-shaped core material having two opposing heat transfer surfaces with a thickness of 4 mm made of a glass wool molded body cut into a substantially foot shape is used. The laminate film is covered with a laminate film and the inside of the laminate film is decompressed, and a laminate film heat welding portion 33 is provided around a substantially foot-shaped core member portion 32. Since the heat welding part 33 is formed along the periphery of the core part 32, the non-core part 34 which does not have a heat insulation function can be made smaller. In addition, ten groove-like recesses are provided as the bent portions 35 in a portion corresponding to the vicinity of the base of the toes.

  At this time, as the laminate film, a plastic laminate film in which 25 μm nylon film, 12 μm PET film, 6 μm aluminum foil, and 30 μm polyethylene are laminated from the outermost layer is used. However, the laminate film is particularly desirable to have excellent bending resistance, and known materials can be applied.

  Furthermore, the vacuum sealing method of this vacuum heat insulating material will be described 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, a plurality of core materials are separated on substantially the same plane between two pairs of gas barrier laminate films. And after depressurizing to a predetermined pressure, heat and pressurize including the part with the core material between the jacket materials, except for the part with the core material between the opposing heat-welded layers The vacuum heat insulating material is manufactured by heat welding so as to follow the shape of the core material. At this time, at least a part of the contact portion between the heat transfer surface of the core material and the jacket material is heat-welded. When the vacuum heat insulating material is formed by such a vacuum sealing method, the heat welded portion is formed so as to follow the periphery of the core material, and thus the non-core material portion becomes smaller.

  Thereafter, the heat-welded non-core material portion is cut into a shape substantially similar to the shape of the core material, and subsequently, a groove-shaped concave portion is provided by pressing on the surface in contact with the sole as the bent portion 35 to provide a substantially foot-shaped vacuum heat insulation. It is made of wood.

  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 bottom. The foot can be kept warm in a cold environment.

  Moreover, since the vacuum heat insulating material 31 has provided the bending part 35 which provided the groove-shaped recessed part with two or more, it can also follow the bending | flexion of the shoes at the time of a walk easily and can be used without a sense of incongruity. There is no problem with bending durability.

  In addition, because the groove-shaped recess is formed by press molding, there is no need for multiple core material arrangements and positioning with respect to the core material arrangement, and man-hours can be greatly reduced. It can be provided at low cost.

  The shoe 11 according to the present embodiment is a vacuum heat insulating material in which a plate-shaped core material having two heat transfer surfaces facing each other is covered with two gas barrier covering materials (laminate film) and the inside is decompressed and sealed. 31 is a footwear (shoe 11) applied to at least the bottom, and the vacuum heat insulating material 31 is formed by thermally welding at least a part of a contact portion between the heat transfer surface of the core material and the jacket material (laminate film), And the outer periphery of the non-core material part 34 without the core material between the two outer cover materials (around the core material part 32 having the core material between the two outer cover materials) The core material is heat-sealed so as to follow the shape of the core material (shape of the core material portion 32), and the core material is sealed under reduced pressure, and the heat-welded portion (seal portion) is attached to the non-core material portion 34 around the core material portion 32. ) 33 is formed.

  The vacuum heat insulating material 31 is heat-sealed so that a covering material (laminate film) around the core material (around the core material portion 32) conforms to the core material shape (shape of the core material portion 32), and is sealed under reduced pressure. Therefore, since the non-core material part 34 (width) without the core material can be reduced, the core material part 32 having heat insulation performance can be made larger, and the effective heat insulation area becomes larger. Moreover, since the shape of the vacuum heat insulating material 31 can be shape | molded so that it may match substantially foot shape and the shape of the bottom part of footwear, the comfortable footwear (shoe 11) can be provided.

  Further, the vacuum heat insulating material 31 applied to the bottom of the shoe 11 of the present embodiment has a portion corresponding to the vicinity of the base of the toe (the bent portion of the bottom and its surroundings) so as to follow the bending of the bottom during walking. 10 (a plurality) of groove-like recesses are provided approximately in parallel with each other in accordance with the bending of the bottom portion to constitute the bent portion 35 of the vacuum heat insulating material 31.

  Since the bottom part of the footwear (shoe 11) bends every time it walks, it is necessary to bend the vacuum heat insulating material 31 arrange | positioned at the bottom following this. Therefore, the vacuum heat insulating material 31 arranged at the bottom of the footwear (shoes 11) is a groove-like recess at any place corresponding to the bent part of the bottom part and its peripheral part (a part corresponding to the vicinity of the base of the toes). A plurality of (10) are provided.

  Therefore, even when the bottom of the footwear (shoe 11) repeats bending and restoration during walking, the vacuum heat insulating material 31 can follow the bottom and repeat the bending and restoration. In addition, since the bent portion 35 is formed by providing a plurality of groove-like recesses, the stress on the laminate film during bending is dispersed, so that it is possible to suppress the occurrence of film cracks and the like due to bending. The bending durability of the heat insulating material 31 is improved. Furthermore, since the core having heat insulation performance exists in the groove-shaped recess, the heat insulation performance is not impaired. For the above reasons, the footwear (shoe 11) is excellent in heat insulation performance and comfort.

  Also, by arranging the plurality of groove-shaped recesses so that each is substantially parallel and parallel to the bending rotation axis, the bending at the time of bending is concentrated on one groove-shaped recess. Not distributed to multiple. In other words, the bending stress of the vacuum heat insulating material 31 is improved because the bending stress during bending acts in a distributed manner without concentrating on one part of the laminate film as the jacket material.

  Moreover, the groove-shaped recessed part which comprises the bending part 35 of the vacuum heat insulating material 31 presses the core material part 32 of the vacuum heat insulating material 31 with a jacket material (laminate film) after shaping | molding the vacuum heat insulating material 31. The formed groove-shaped recess is a decompressed space continuous with the adjacent core member 32.

  Therefore, in order to form the groove-shaped recess, there is no need for a plurality of core material arrangements or positioning with respect to the core material arrangement, and the man-hours can be greatly reduced. Therefore, footwear (shoe 11) to which the vacuum heat insulating material 31 is applied. Can be provided at low cost. In addition, since the groove-shaped recess is a decompressed space that is continuous with the adjacent core member 32, the volume of the gas phase can be increased and the aging characteristics of the heat insulation performance can be improved.

  Further, the bottom of the footwear (shoe 11) is repeatedly bent and restored every time it walks, but the bending direction during walking is bent so that the instep of the foot approaches the toes with the joint near the base of the toes as the center. Therefore, the vacuum heat insulating material 31 disposed on the bottom of the footwear (shoe 11) needs to be bent in the same manner.

  Therefore, in the present embodiment, by providing a groove-like recess as the bent portion 35 on the foot side surface of the vacuum heat insulating material 31, the groove-like shape provided in the vacuum heat insulating material 31 when the vacuum heat insulating material 31 is bent. Since the core material facing through the recess is less likely to interfere, it greatly contributes to improvement in flexibility and improvement in bending durability. Further, by providing a plurality of groove-like recesses, the flexibility and bending durability of the vacuum heat insulating material 31 are further improved. Therefore, the footwear (shoes 11) is comfortable to wear.

  Moreover, since the part (bending part 35) in which the groove-shaped recessed part of the vacuum heat insulating material 31 was formed was made thinner than the part of the other vacuum heat insulating material, the base of the finger on the sole is vacuum. A fit feeling improves by being settled in the thin part of the heat insulating material 31, and comfort improves.

  Moreover, in the bending part 35, since the thickness of the vacuum heat insulating material 31 is thin and the outer covering material (laminate film) approaches a flat surface, the load applied to the outer covering material (laminate film) in the case of repeated bending and restoration during walking. The bending durability of both surfaces of the vacuum heat insulating material 31 is improved.

  Moreover, the vacuum heat insulating material 31 applied to the bottom part of this Embodiment is the thickness of the core material of the vacuum heat insulating material 31 being 4 mm, and the laminate film includes a 25 μm nylon film, a 12 μm PET film, a 6 μm thick film from the outermost layer. Since a plastic laminate film in which aluminum foil and 30 μm polyethylene are laminated is used, the core material portion 32 of the vacuum heat insulating material 31 has a thickness of 1 mm to 5 mm, the core material portion 32 has a substantially foot shape, and the core. The non-core material part 34 heat-sealed along the periphery of the material part 32 has a substantially foot shape.

  Therefore, the vacuum heat insulating material 31 is excellent in heat insulation, flexibility, and bending durability, and can be effectively applied as a bottom heat insulating material for footwear (shoe 11) and a heat insulating material for an insole of footwear (shoe 11). Further, since the heat insulating material is as thin as 1 mm or more and 5 mm or less, it can be used without any problem even if it is difficult to secure a space, or even an insole for footwear.

(Embodiment 2)
FIG. 5 is a side view of a vacuum heat insulating material applied to a shoe according to Embodiment 2 of the present invention. The specification of the shoe is the same as that of the first embodiment, and the description is omitted.

  The vacuum heat insulating material 31 applied to the shoe in the second embodiment shown in FIG. 5 is a plate-shaped core material having two opposing heat transfer surfaces with a thickness of 5 mm made of a glass wool molded body cut into a substantially foot shape. Is covered with a gas barrier laminate film, and the inside of the laminate film is decompressed. A heat welding portion 33 of the laminate film is provided around a substantially foot-shaped core member portion 32. Since the heat welding part 33 is formed along the periphery of the core part 32, the non-core part 34 which does not have a heat insulation function can be made smaller. In addition, ten groove-like recesses are provided as the bent portions 35 in a portion corresponding to the vicinity of the base of the toes. In addition, a groove-like recess is provided on the sole side surface of the vacuum heat insulating material 31.

  The position of the heat-welded part (seal part of the jacket material around the core material, where the jacket materials are thermally welded) 33 is at least in the vicinity of the bent part 35 where the groove-shaped recess is provided. In the direction, it is provided at a position near the heat transfer surface on the shoe sole side of the core material. Here, the position of the heat welding part 33 refers to the position of the part in contact with the core material in the heat welding part 33 where the laminate films are welded together.

  The vacuum heat insulating material 31 is formed by the same method as in the first embodiment.

  With the configuration as described above, the position of the heat welding portion 33 is closer to the shoe sole side, so that the laminate film (outer coating material) on the side where the heat welding portion 33 of the vacuum heat insulating material 31 is closer approaches a flat surface. When the vacuum heat insulating material 31 repeats bending and restoration during walking, the load applied to the laminate film is smaller when repeating the bending restoration from the two-dimensional state as a plane than when repeating the bending restoration from the three-dimensional state. This is because a strong load is locally applied by bending the three-dimensional jacket material. Therefore, the occurrence of film cracks and the like due to bending can be suppressed, and the bending durability of the vacuum heat insulating material 31 is improved.

  It is ideal that the position of the heat welded portion 33 is close in the entire vacuum heat insulating material 31, but the above effect can be obtained if it is close at least around the bent portion 35. As the degree of deviation, the distance between the heat-welded portion 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.

  The direction in which the vacuum heat insulating material 31 applied to the bottom of the shoe 11 bends is characterized by only the single-sided direction, and the outer covering material (laminate film) on the shoe bottom side is stretched by walking, so that a heavy load is applied. Therefore, by bringing the position of the heat welding part 33 toward the shoe sole side, it is possible to further suppress the occurrence of film cracks or the like of the shoe sole side jacket material, and the bending durability of the vacuum heat insulating material 31 is improved.

  On the contrary, since the outer cover material on the side where the heat welding part 33 is not approached is in the direction away from the plane, the load due to bending during walking increases. Therefore, a concave portion is provided on the surface on the side where the heat welding portion 33 does not approach.

  Therefore, since a plurality of groove-like recesses are provided, the load on the laminate film at the time of bending is dispersed, so that it is possible to suppress the occurrence of film cracks and the like due to bending, and on both sides of the vacuum heat insulating material 31 Bending durability is improved. Moreover, since the vacuum heat insulating material 31 becomes easy to bend | bend to the surface side in which the recessed part was provided, flexibility is also obtained, improving the bending durability of both surfaces of the vacuum heat insulating material 31. FIG.

  Moreover, since the heat welding part 33 has approached the shoe sole side and a clearance gap will be left between the sole and the heat welding part 33, an impact absorber, a deodorant, a dehumidifying agent, etc. are put in this clearance gap. In addition to heat insulation performance, additional functions can be added using a limited space. Moreover, since it can arrange | position to the sole side, it is excellent in a dehumidification efficiency and an impact-absorbing property. Further, even when the gap is filled with an exterior material or other member, it is easy to fill because the gap is formed on one side of the vacuum heat insulating material 31.

  Moreover, since the part in which the groove-shaped recessed part of the vacuum heat insulating material 31 was formed is formed by making thickness thinner than the part of the other vacuum heat insulating material 31, the base of the finger of the sole is a vacuum heat insulating material. A fit feeling improves by being settled in the thin part of 31, and comfort improves.

  Moreover, since it is thin, since the laminate film approaches a flat surface, the load applied to the laminate film when it is repeatedly bent and restored during walking can be reduced, and the bending durability of both surfaces of the vacuum heat insulating material 31 is improved. As a thinning method, the core material may be thinned in advance to form the vacuum heat insulating material 31 or may be thinned by pressing simultaneously with the pressing of the recesses.

  Contrary to the present embodiment, bending durability is improved even when the vacuum heat insulating material 31 is turned over and disposed on the shoe so that the concave portion is on the shoe sole side, but the specification of the second embodiment However, the improvement effect is desirable. Further, the vacuum heat insulating material 31 is easier to follow and walk even when the shoe is bent when walking, compared to the case where there is no recess, but the specifications of the second embodiment are more easily followed.

  Further, as in the present embodiment, the position of the bottom surface of the concave portion is made substantially the same plane as that of the heat-welded portion 33, so that the laminate film becomes flat at the bent portion 35, so that the bending durability The nature is further improved. The substantially same plane indicates a difference of about 0 to 0.5 mm.

  In addition, in this Embodiment, although the position of the heat welding part 33 has approached the shoe sole side, you may approach to the substantially same plane as the heat-transfer surface of a core material. Thereby, the bending durability of the vacuum heat insulating material 31 further improves.

  The shoe 11 according to the present embodiment is a vacuum heat insulating material in which a plate-shaped core material having two heat transfer surfaces facing each other is covered with two gas barrier covering materials (laminate film) and the inside is decompressed and sealed. 31 is a footwear (shoe 11) applied to at least the bottom, and the vacuum heat insulating material 31 is formed by thermally welding at least a part of a contact portion between the heat transfer surface of the core material and the jacket material (laminate film), And the outer periphery of the non-core material part 34 without the core material between the two outer cover materials (around the core material part 32 having the core material between the two outer cover materials) The core material is heat-sealed so as to follow the shape of the core material (shape of the core material portion 32), and the core material is sealed under reduced pressure, and the heat-welded portion (seal portion) is attached to the non-core material portion 34 around the core material portion 32. ) 33 is formed.

  The vacuum heat insulating material 31 is heat-sealed so that a covering material (laminate film) around the core material (around the core material portion 32) conforms to the core material shape (shape of the core material portion 32), and is sealed under reduced pressure. Therefore, since the non-core material part 34 (width) without the core material can be reduced, the core material part 32 having heat insulation performance can be made larger, and the effective heat insulation area becomes larger. Moreover, since the shape of the vacuum heat insulating material 31 can be shape | molded so that it may match substantially foot shape and the shape of the bottom part of footwear, the comfortable footwear (shoe 11) can be provided.

  Further, the vacuum heat insulating material 31 applied to the bottom of the shoe 11 of the present embodiment has a portion corresponding to the vicinity of the base of the toe (the bent portion of the bottom and its surroundings) so as to follow the bending of the bottom during walking. 10 (a plurality) of groove-like recesses are provided approximately in parallel with each other in accordance with the bending of the bottom portion to constitute the bent portion 35 of the vacuum heat insulating material 31.

  Since the bottom part of the footwear (shoe 11) bends every time it walks, it is necessary to bend the vacuum heat insulating material 31 arrange | positioned at the bottom following this. Therefore, the vacuum heat insulating material 31 arranged at the bottom of the footwear (shoes 11) is a groove-like recess at any place corresponding to the bent part of the bottom part and its peripheral part (a part corresponding to the vicinity of the base of the toes). A plurality of (10) are provided.

  Therefore, even when the bottom of the footwear (shoe 11) repeats bending and restoration during walking, the vacuum heat insulating material 31 can follow the bottom and repeat the bending and restoration. In addition, since the bent portion 35 is formed by providing a plurality of groove-like recesses, the stress on the laminate film during bending is dispersed, so that it is possible to suppress the occurrence of film cracks and the like due to bending. The bending durability of the heat insulating material 31 is improved. Furthermore, since the core material having the heat insulating performance exists in the groove-shaped recess, the heat insulating performance is not impaired. For the above reasons, the footwear (shoe 11) is excellent in heat insulation performance and comfort.

  Also, by arranging the plurality of groove-shaped recesses so that each is substantially parallel and parallel to the bending rotation axis, the bending at the time of bending is concentrated on one groove-shaped recess. Not distributed to multiple. In other words, the bending stress of the vacuum heat insulating material 31 is improved because the bending stress during bending acts in a distributed manner without concentrating on one part of the laminate film as the jacket material.

  Moreover, the groove-shaped recessed part which comprises the bending part 35 of the vacuum heat insulating material 31 presses the core material part 32 of the vacuum heat insulating material 31 with a jacket material (laminate film) after shaping | molding the vacuum heat insulating material 31. The formed groove-shaped recess is a decompressed space continuous with the adjacent core member 32.

  Therefore, in order to form the groove-shaped recess, there is no need for a plurality of core material arrangements or positioning with respect to the core material arrangement, and the man-hours can be greatly reduced. Therefore, footwear (shoe 11) to which the vacuum heat insulating material 31 is applied. Can be provided at low cost. In addition, since the groove-shaped recess is a decompressed space that is continuous with the adjacent core member 32, the volume of the gas phase can be increased and the aging characteristics of the heat insulation performance can be improved.

  Further, the bottom of the footwear (shoe 11) is repeatedly bent and restored every time it walks, but the bending direction during walking is bent so that the instep of the foot approaches the toes with the joint near the base of the toes as the center. Therefore, the vacuum heat insulating material 31 disposed on the bottom of the footwear (shoe 11) needs to be bent in the same manner.

  Therefore, in the present embodiment, by providing a groove-like recess as the bent portion 35 on the foot side surface of the vacuum heat insulating material 31, the groove-like shape provided in the vacuum heat insulating material 31 when the vacuum heat insulating material 31 is bent. Since the core material facing through the recess is less likely to interfere, it greatly contributes to improvement in flexibility and improvement in bending durability. Further, by providing a plurality of groove-like recesses, the flexibility and bending durability of the vacuum heat insulating material 31 are further improved. Therefore, the footwear (shoes 11) is comfortable to wear.

  Moreover, since the part (bending part 35) in which the groove-shaped recessed part of the vacuum heat insulating material 31 was formed was made thinner than the part of the other vacuum heat insulating material, the base of the finger on the sole is vacuum. A fit feeling improves by being settled in the thin part of the heat insulating material 31, and comfort improves.

  Moreover, in the bending part 35, since the thickness of the vacuum heat insulating material 31 is thin and the outer covering material (laminate film) approaches a flat surface, the load applied to the outer covering material (laminate film) in the case of repeated bending and restoration during walking. The bending durability of both surfaces of the vacuum heat insulating material 31 is improved.

  Moreover, the vacuum heat insulating material 31 applied to the bottom of the present embodiment has a thickness of 5 mm of the core material of the vacuum heat insulating material 31, and the laminated film includes a 25 μm nylon film, a 12 μm PET film, and a 6 μm thick outermost layer. Since a plastic laminate film in which aluminum foil and 30 μm polyethylene are laminated is used, the core part 32 of the vacuum heat insulating material 31 has a thickness of about 5 mm, the core part 32 has a substantially foot shape, and the core part. The non-core material part 34 heat-sealed along the periphery of 32 has a substantially foot shape.

  Therefore, the vacuum heat insulating material 31 is excellent in heat insulation, flexibility, and bending durability, and can be effectively applied as a bottom heat insulating material for footwear (shoe 11) and a heat insulating material for an insole of footwear (shoe 11). Further, since the heat insulating material is as thin as about 5 mm, it can be used without any problem even if it is difficult to secure a space, or even an insole for footwear.

  In the vacuum heat insulating material 31 applied to the bottom of the footwear (shoe 11) of the present embodiment, the outer covering materials (laminate film) around the core material (around the core material portion 32) are thermally welded to each other. The position of the sealing portion (thermal welding portion 33) 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.

  Therefore, as compared with the case where the position of the seal portion (thermal welding portion 33) in the thickness direction of the core material is substantially in the middle of the heat transfer surfaces on both sides of the core material, the seal portion (thermal welding portion 33) and the seal The space | interval with the heat-transfer surface of the core material which the part (thermal welding part 33) has approached becomes narrow, and the outer cover material of the side (shoe sole side) where the seal part of the vacuum heat insulating material 31 has approached approaches a plane.

  When the bending and restoration of the vacuum heat insulating material 31 are repeated during walking, the load applied to the jacket material (laminate film) is restored from the two-dimensional state, which is a plane, rather than repeating the bending restoration from the three-dimensional state. It is smaller to repeat. This is because a strong load is locally applied by bending the three-dimensional jacket material (laminate film). Therefore, the occurrence of film cracks and the like due to bending can be suppressed, and the bending durability of the vacuum heat insulating material 31 is improved.

  Further, the direction in which the vacuum heat insulating material 31 applied to the bottom portion is bent is characterized by only the single-side direction, and the load on both surfaces of the vacuum heat insulating material 31 is different. Therefore, the occurrence of film cracks and the like due to bending can be suppressed by bringing the seal portion (thermal welding portion 33) closer to one side in accordance with the specifications and usage pattern of the footwear (shoe 11). The bending durability is improved.

  When the vacuum heat insulating material 31 applied to the bottom portion is bent during walking, the outer covering material (laminate film) on the shoe bottom side is stretched, so that a heavy load is applied. In consideration of this, in the present embodiment, the position of the seal portion (thermal welding portion 33) 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.

  Therefore, it becomes possible to suppress the occurrence of film cracks or the like of the shoe sole side covering material (laminate film), which is heavily loaded by bending and restoration during walking, and the bending durability of the vacuum heat insulating material 31 is improved.

  In addition, since a gap is left between the sole and the seal part (thermal welding part 33), it is possible to put an impact absorber, a deodorant, a dehumidifier, etc. in this gap, Additional functions can be added using a limited space. Moreover, since it can arrange | position to the sole side, it is excellent in a dehumidification efficiency and an impact-absorbing property.

  Moreover, the groove-shaped recessed part which comprises the bending part 35 of the vacuum heat insulating material 31 applied to the bottom part is the heat-transfer surface (the heat-transfer surface by the side of a shoe sole) where the seal part (thermal welding part 33) has approached ) And the opposite side (the sole side).

  The outer cover material (laminate film) in contact with the heat transfer surface of the core material on the side (shoe sole side) on which the seal portion (thermal welding portion 33) is approaching approaches a two-dimensional flat surface, so the load due to bending during walking Is reduced. However, since the other jacket material (laminate film) is in a direction away from the plane, the load due to bending during walking increases. In view of this, in the present embodiment, a groove shape is formed on the surface on the opposite side (the sole side) and the heat transfer surface (the heat transfer surface on the shoe sole side) of the core member on which the seal portion (the heat welding portion 33) is approaching. The recess was formed.

  Therefore, by providing a plurality of groove-like recesses, the load on the jacket material (laminate film) at the time of bending is dispersed, so that the occurrence of film cracks and the like due to bending is suppressed on both surfaces of the vacuum heat insulating material 31. Thus, the bending durability of both surfaces of the vacuum heat insulating material 31 is improved.

  Moreover, the direction in which the vacuum heat insulating material 31 applied to the bottom part is bent is only the one-side direction, and the vacuum heat insulating material 31 is easily bent to the surface side where the concave portion is provided. Therefore, flexibility is also obtained while improving the bending durability of both surfaces of the vacuum heat insulating material 31.

(Embodiment 3)
FIG. 6 is a side view of a vacuum heat insulating material applied to a shoe according to Embodiment 3 of the present invention. The specification of the shoe is the same as that of the first embodiment, and the description is omitted.

  The vacuum heat insulating material 31 applied to the shoe in Embodiment 3 shown in FIG. 6 is provided with ten groove-like recesses on both sides of the vacuum heat insulating material 31 as bent portions 35 at portions corresponding to the vicinity of the base of the toes. . Other configurations of the vacuum heat insulating material 31 are the same as those in the second embodiment.

  The vacuum heat insulating material 31 is formed by the same method as in the first embodiment.

  With the above configuration, since a plurality of groove-shaped recesses are formed on both surfaces of the vacuum heat insulating material 31, the stress on the laminate film (cover material) at the time of bending is distributed on both surfaces of the vacuum heat insulating material 31. The occurrence of film cracks due to bending can be suppressed, and the bending durability of both surfaces of the vacuum heat insulating material 31 is further improved.

  The groove-shaped concave portions on both sides are formed by pressing the core material portion 32 of the vacuum heat insulating material 31 together with the laminate film after the vacuum heat insulating material 31 is formed, and are provided on the surface of the vacuum heat insulating material 31. . Further, when the groove-shaped recess is formed by pressing, a groove-shaped recess is formed on the back surface of the vacuum heat insulating material 31 due to the shrinkage of the core due to the pressure. You may provide a recessed part.

(Embodiment 4)
FIG. 7 is a top view of a shoe insole according to Embodiment 4 of the present invention, and FIG. 8 is a cross-sectional view taken along line AA ′ of the shoe insole according to Embodiment 4 of the present invention.

  7 and 8, the insole 51 of the shoe is configured by bonding an elastomer 52 with a cloth on the surface of the vacuum heat insulating material 31 having the same configuration as that used in the first embodiment and a plastic film 53 on the back surface. is doing.

  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 do not change significantly from the conventional insole, and it can be used without being affected by the shape of the shoe, the type of shoe, etc. it can. Furthermore, since the insole is attached to the vacuum heat insulating material 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 core part thickness of the vacuum heat insulating material, by increasing the thickness, it is possible to provide an insole for shoes with higher heat retention performance, and application in severer cold regions can also be expected. 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.

  If the vacuum heat insulating material 31 is arranged at the bottom of the footwear and integrated with the footwear as in the first embodiment, it becomes uncomfortable when the footwear is used under a warm condition. Therefore, by attaching an exterior material (for example, an elastomer 52 with a cloth on the front surface and a plastic film 53 on the back surface) to the vacuum heat insulating material 31 and using it as an insole for footwear, it becomes possible to remove and attach it according to the climate and temperature. .

  In addition, the insole of the footwear of the present embodiment has a non-core part 34 in which the core part 32 of the vacuum heat insulating material 31 has a substantially foot shape and is thermally welded along the periphery of the core part 32. It has a substantially foot shape.

  The vacuum heat insulating material 31 is heat-welded so as to follow the core material shape (non-core material portion 34) made of a laminate film around the core material (around the core material portion 32) and sealed under reduced pressure. Therefore, the non-core material portion 34 (the width thereof) having no core material can be reduced between the two jacket materials, and the effective heat insulation area is increased. Therefore, the heat insulation performance can be improved while molding so as to match the substantially foot shape and the bottom shape of the footwear.

  Therefore, the size and appearance of the conventional insole are not significantly changed, and it can be used without being influenced by the shape of the shoe, the type of the shoe, or the like.

  In addition, since it is excellent in flexibility and bending durability, it is possible to provide an insole excellent in comfort and economy.

  Hereinafter, the relationship between the specification of the bent portion of the vacuum heat insulating material that can be used as shoes and an insole of the shoe, the bending durability, and the heat retention characteristics during wearing will be described with reference to examples and comparative examples.

  Note that the vacuum heat insulating material was vacuum sealed by the vacuum heat insulating material, and the constituent materials were basically the same as in the first embodiment. Thereafter, the insole of the shoe was molded by the same method as in Embodiment 4 and various evaluations were performed.

  The evaluation was performed by a method in which an insole using a vacuum heat insulating material was attached to a boot for cold protection, and a mounting test was carried out by 10 subjects. Among these, in the heat retention characteristic test at the time of wearing, the surface temperature of the insole of the boot was measured at −5 ° C., and the one that cleared the reference value was regarded as acceptable. The comfort test was a sensory test, and 8 subjects were judged to have no problem and passed. The bending durability was a one month mounting test, and after one month, the deterioration of the thermal conductivity of the insole was within 10%.

  In addition, the relationship between the bending part specifications and the evaluation results in Examples and Comparative Examples is shown in (Table 1).

  As shown in Example 1 to Example 4, when the groove-shaped concave portion has four, six, eight, or ten groove-shaped recesses, the heat retention characteristics during wearing, comfort, and bending are all applied. All of the durability results in passing. Moreover, the thing which gave ten groove-shaped recessed parts to the bending part 35 had the least deterioration of the thermal conductivity after an endurance test.

  Further, as shown in Example 5, even when the position of the heat-welded portion 33 was set to the sole side, all of the heat retention characteristics during wearing, the comfortability, and the bending durability were passed, but Example 4 The deterioration in thermal conductivity after the endurance test was smaller.

  Moreover, the deterioration of the thermal conductivity after the endurance test was smaller than that of Example 4 by setting the side of the heat welding portion 33 to 35% as in Example 6. The proximity of the heat welded portion 33 is the distance between the heat welded portion and the shoe sole side surface of the vacuum heat insulating material 31 in the entire thickness of the vacuum heat insulating material 31.

  On the other hand, Comparative Example 1 could not clear the comfort and bending durability, and the specification shown in Comparative Example 2 could not clear only bending durability (not shown).

  From the above results, it can be seen that specifications with a large number of grooves or a narrow gap between grooves are specifications excellent in bending durability. Moreover, it turns out that it is excellent in bending durability by bringing the heat welding part 33 to the shoe sole side. By adopting such a specification, the stress at the time of bending can be distributed to each groove, and the addition to one groove can be reduced, so the local load on the film is reduced, so the film is deteriorated. We think that we can suppress.

  In Comparative Example 3, the core material is divided into four parts, and the bendability is improved by forming a non-core material portion in which the core material does not exist in the bent portion 35, and the comfort and the bending durability are completely improved. There was no problem, but the heat retention characteristics could not be cleared.

  The top views of the vacuum heat insulating materials having the bent portion specifications of Examples 1 to 3 are shown in FIGS. 9 to 11, respectively. Moreover, the top view of the vacuum heat insulating material which has the bending part specification of the comparative example 3 is shown in FIG.

  In addition, the structure of Example 4 is equivalent to the vacuum heat insulating material shown by FIG. 3 and FIG. In addition, the structure of Example 5 is equivalent to the vacuum heat insulating material shown by FIG. The configuration of the sixth embodiment is substantially the same as that of the vacuum heat insulating material shown in FIG.

  In the embodiment, a groove-like concave portion is provided as the bent portion 35 in a portion corresponding to the vicinity of the base of the toe, but there is no problem even if it is provided in the peripheral portion of the bent portion 35. It is possible to further increase the number of recesses or to combine two or more types of groove-shaped recess directions.

  Further, the groove-shaped recess is formed by pressing the core material portion of the vacuum heat insulating material together with the outer cover material after forming the vacuum heat insulating material, and is applied to the surface of the vacuum heat insulating material. However, when the groove-shaped concave portion is formed by pressing, a groove-shaped concave portion is formed on the back surface of the vacuum heat insulating material due to the shrinkage of the core material by the pressure, but there is no particular problem.

  As described above, the vacuum heat insulating material according to the present invention, and footwear and footwear insole to which the vacuum heat insulating material is applied are effective in keeping body heat and blocking cold by applying a 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 The longitudinal cross-sectional view of the shoes in Embodiment 1 of this invention The top view of the vacuum heat insulating material applied to the shoes in Embodiment 1 of this invention The side view 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 Side view of the vacuum heat insulating material applied to the shoe in Embodiment 3 of this invention Top view of an insole for shoes in Embodiment 4 of the present invention A-A 'sectional view of FIG. The top view of the vacuum heat insulating material in Example 1 of this invention The top view of the vacuum heat insulating material in Example 2 of this invention The top view of the vacuum heat insulating material in Example 3 of this invention The top view of the vacuum heat insulating material in the comparative example 3 of this invention External perspective view of conventional vacuum insulation

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 Shoes 12 Bottom part 17 Shoe bottom 31 Vacuum heat insulating material 32 Core material part 33 Heat welding part 34 Non-core material part 35 Bending part 51 Insole of shoes 52 Elastomer with cloth 53 Plastic film

Claims (13)

  Footwear in which a plate-shaped core material having two heat transfer surfaces facing each other is covered with a gas barrier outer covering material, and a vacuum heat insulating material sealed by reducing the inside is applied to at least one part of the bottom. In the vacuum heat insulating material, at least a part of the contact portion between the heat transfer surface of the core member and the outer cover member is thermally welded, and the outer cover member around the core member is formed along the core member shape. Footwear is sealed under reduced pressure by heat welding.   The position of the seal | sticker part in which the said jacket materials were heat-welded of the jacket materials around a core material is provided in the position near one heat-transfer surface of the said core material in the thickness direction of a core material. Footwear described in.   The footwear according to claim 2, wherein the position of the seal portion 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.   The vacuum heat insulating material is provided with a plurality of groove-shaped concave portions at any location corresponding to the bent portion of the bottom portion and its peripheral portion so as to follow the bending of the bottom portion during walking. Item 4. The footwear according to any one of items 3.   The groove-shaped recess of the vacuum heat insulating material is formed by pressing the core material portion of the vacuum heat insulating material together with the jacket material after forming the vacuum heat insulating material, and the recess is formed with the adjacent core material portion. The footwear according to claim 4, which is a continuous decompression space.   The footwear according to claim 4 or 5, wherein the groove-like recess of the vacuum heat insulating material is formed on a surface on the sole side.   The footwear according to any one of claims 4 to 6, wherein the groove-shaped concave portion of the vacuum heat insulating material is formed on a surface opposite to the heat transfer surface of the core member on which the seal portion approaches.   The footwear according to any one of claims 4 to 6, wherein the groove-like recesses of the vacuum heat insulating material are formed on both sides of the vacuum heat insulating material.   The footwear according to any one of claims 4 to 8, wherein a portion of the vacuum heat insulating material in which the groove-like concave portion is formed is formed thinner than a portion of the other vacuum heat insulating material.   The footwear according to any one of claims 4 to 9, wherein each of the plurality of groove-shaped recesses of the vacuum heat insulating material is arranged substantially in parallel.   An insole for footwear comprising a surface covering material bonded to either the front surface or the back surface of the vacuum heat insulating material according to any one of claims 1 to 10.   The insole for footwear according to claim 11, wherein the core portion of the vacuum heat insulating material has a substantially foot shape, and the non-core material portion heat-welded along the periphery of the core portion has a substantially foot shape.   It is a vacuum heat insulating material as described in any one of Claims 1-11, Comprising: The core material part of the said vacuum heat insulating material is 1 mm or more in thickness and 5 mm or less, The said core material part is a substantially foot shape, And the vacuum heat insulating material whose non-core material part heat-welded along the circumference | surroundings of the said core material part is a substantially foot shape.

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