WO2021006165A1 - Foot warmer - Google Patents

Foot warmer Download PDF

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Publication number
WO2021006165A1
WO2021006165A1 PCT/JP2020/025949 JP2020025949W WO2021006165A1 WO 2021006165 A1 WO2021006165 A1 WO 2021006165A1 JP 2020025949 W JP2020025949 W JP 2020025949W WO 2021006165 A1 WO2021006165 A1 WO 2021006165A1
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WO
WIPO (PCT)
Prior art keywords
heating element
protruding
protruding portion
foot
bag body
Prior art date
Application number
PCT/JP2020/025949
Other languages
French (fr)
Japanese (ja)
Inventor
悟朗 園田
哲也 丸山
Original Assignee
小林製薬株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 小林製薬株式会社 filed Critical 小林製薬株式会社
Publication of WO2021006165A1 publication Critical patent/WO2021006165A1/en

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    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F7/00—Heating or cooling appliances for medical or therapeutic treatment of the human body
    • A61F7/02—Compresses or poultices for effecting heating or cooling
    • A61F7/03—Compresses or poultices for effecting heating or cooling thermophore, i.e. self-heating, e.g. using a chemical reaction

Definitions

  • the present invention relates to a heating element for feet.
  • Patent Document 1 discloses a conventional heating element.
  • the heating element described in Patent Document 1 includes a heat-generating composition (heating material) that generates heat when it comes into contact with air, and a storage bag (bag body) that stores the heat-generating composition.
  • the storage bag is formed in a bag shape by stacking two sheet materials and sealing the outer peripheral edge portion.
  • the heating element described in Patent Document 1 can be used by arranging it between the sole of the foot and the inner sole of the shoe. is there.
  • the heating element described in Patent Document 1 since the heating element is in close contact with the foot inside the shoe, the heat-generating composition easily moves inside the bag body during walking, and the bag body Inside, the exothermic composition may be biased toward one end. Also, looking at the temperature distribution on the heat generating surface, the temperature in the central part tends to be relatively high when viewed from the front, but since the heating element for feet is sandwiched between the foot and the inner surface of the shoe, on the heat generating surface, It is less desirable that a high local temperature rise occurs. Various measures have been taken for the local high temperature rise on the heating surface of the heating element for feet, but better measures are desired.
  • the present invention has been made in view of the above circumstances, and provides a heating element for feet, which is capable of preventing the heating material from shifting inside the bag body and lowering the maximum temperature of the heating surface to suppress a locally high temperature rise.
  • the purpose is to do.
  • the foot heating element according to the present invention is a foot heating element arranged between a user's foot and shoes, and is a bag-shaped body formed by a front side sheet portion and a back side sheet portion. , A heat-generating material enclosed in the bag body.
  • the bag body has a joint portion in which the front side sheet portion and the back side sheet portion are joined.
  • the joint portion includes an edge portion formed along at least a part of the outer periphery of the bag body, and a protruding portion protruding from the edge portion toward the heat generating material side.
  • the protruding dimension of the protruding portion is 15% or more and 35% or less with respect to the inner dimension of the bag body at the position corresponding to the protruding portion in the direction in which the protruding portion protrudes. It is preferable to have.
  • the dimension between the protruding portion and the portion facing the protruding portion in the direction in which the protruding portion protrudes is the inside of the bag body at a position corresponding to the protruding portion. It is preferably 30% or more and 70% or less with respect to the dimension.
  • the foot heating element includes a plurality of the protrusions and the protruding directions of the plurality of protrusions are in a straight line.
  • a recess is formed in a portion corresponding to the protruding portion on the outer edge of the bag body.
  • the heating element for feet according to the above aspect of the present invention has an advantage that the heating material is less likely to be biased inside the bag body, and the maximum temperature of the heating surface can be lowered to suppress a locally high temperature rise. ..
  • FIG. 1 is a cross-sectional view of a usage state of a foot heating element according to an embodiment of the present invention.
  • FIG. 2 is a front view of the same heating element for feet.
  • FIG. 3A is a cross-sectional view taken along the line AA in FIG.
  • FIG. 3B is a bottom view of the same heating element for feet.
  • FIG. 4 is a front view of the heating element of the modified example 1-1.
  • FIG. 5 is a front view of the heating element of the modified example 1-2.
  • FIG. 6 is a front view of the heating element of the modified example 1-3.
  • FIG. 7 is a front view of the heating element of the modified example 2.
  • FIG. 8 is a front view of the heating element of the modified example 3-1.
  • FIG. 10A is an enlarged view of a protruding portion of the heating element according to the modified example 5-1.
  • FIG. 10B is an enlarged view of a protruding portion of the heating element according to the modified example 5-2.
  • FIG. 10C is an enlarged view of a protruding portion of the heating element according to the modified example 5-3.
  • FIG. 10D is an enlarged view of a protruding portion of the heating element according to the modified example 5-4.
  • FIG. 10 (E) is an enlarged view of a protruding portion of the heating element according to the modified example 5-5.
  • FIG. 11A is a front view of the heating element according to the first embodiment.
  • FIG. 11A is a front view of the heating element according to the first embodiment.
  • FIG. 11B is a front view of the heating element according to the second embodiment.
  • FIG. 11C is a front view of the heating element according to the third embodiment.
  • FIG. 11D is a front view of the heating element according to the comparative example.
  • FIG. 12 is a diagram showing the temperature distribution according to the result 1.
  • FIG. 13 is a diagram showing the temperature distribution according to the result 2.
  • FIG. 14 is a graph showing the temperature distribution according to the result 1.
  • FIG. 15 is a graph showing the temperature distribution according to the result 2.
  • Embodiment (1.1) Outline As shown in FIG. 1, the foot heating element 1 according to the present embodiment is arranged between the user's foot 5 (including the toe tip) and the shoe 6. , It is possible to partially give a thermal effect to the user's foot 5.
  • the heating element 1 according to the present embodiment includes a bag-shaped bag body 2 and a heat-generating material 4 enclosed in the bag body 2.
  • the bag body 2 is formed in a bag shape by the front side sheet portion 21 and the back side sheet portion 22, and has a joint portion 3 at least in a part thereof.
  • the joint portion 3 is a portion where the front side sheet portion 21 and the back side sheet portion 22 are joined.
  • the joint portion 3 according to the present embodiment includes an edge portion 31 and a protruding portion 32.
  • the edge portion 31 is formed along at least a part of the outer circumference of the bag body 2 (in the present embodiment, the total length of the outer circumference of the bag body 2).
  • the protruding portion 32 protrudes from the edge portion 31 toward the heat generating material 4.
  • the maximum temperature can be lowered while keeping the area of the high temperature region equal to or higher than that of the foot heating element having no protruding portion 32. Therefore, in the heating element 1 according to the present embodiment, the maximum temperature of the heat generating surface can be lowered, and a locally high temperature rise can be suppressed.
  • the "high temperature range” referred to in the present disclosure means a temperature range above (maximum temperature -5 ° C) and below the maximum temperature in the temperature range of the heat generating surface.
  • the "heating surface” referred to in the present disclosure means a portion of the surface of the bag body 2 surrounded by the edge portion 31 in the bag body 2.
  • each of the front side seat portion 21 and the back side seat portion 22 has a heating surface, and the front view and the rear view of the foot heating element 1 show the heating surface from the front. The direction you saw.
  • the heat generating material 4 is prevented from moving due to the protruding portion 32 inside the bag body 2, so that the heating material 4 is suppressed from being biased. Therefore, even if the foot heating element 1 is arranged between the user's foot 5 and the shoe 6 and the foot 5 is shaken or the foot sole 51 steps on the heat generating material 4 during walking, the present embodiment In the foot heating element 1 according to the above, the heating material 4 is unlikely to be biased inside the bag body 2.
  • the foot heating element 1 is used by being arranged between the user's foot 5 and the shoe 6. In the present embodiment, it is arranged between the fingertip side portion of the user's sole 51 and the toe side portion of the inner sole 61 of the shoe 6.
  • the shoe 6 include athletic shoes, sneakers, shoes, leather shoes, boots, boots (including long boots), slippers, and the like, but are not particularly limited.
  • the “user's foot 5” as used in the present disclosure means a foot or bare foot while wearing socks, stockings, tights, or the like.
  • the foot heating element 1 is a foot heating element that utilizes the heat of reaction generated when an oxidation reaction occurs as a heat source, and is, for example, a disposable body warmer.
  • the foot heating element 1 is housed in, for example, an airtight outer bag (not shown) that does not allow air to pass through before use.
  • the foot heating element 1 As shown in FIG. 2, the foot heating element 1 according to the present embodiment is formed in a substantially D-shape in front view.
  • the foot heating element 1 has a front end formed in an arc shape and a rear end formed in a straight line along the left-right direction.
  • the direction parallel to the front-rear direction is defined as the "length direction”
  • the direction parallel to the left-right direction orthogonal to the length direction is defined as the "width direction”. It should be noted that the definitions of these directions are not intended to limit the usage mode of the foot heating element 1.
  • the arrows indicating each direction in the drawing are shown for the sake of explanation only and are not accompanied by substance.
  • the foot heating element 1 according to the present embodiment is formed in a substantially D-shape in front view, but the shape is not particularly limited as shown in "(3) Deformation example" described later.
  • the heat generation temperature is 25 ° C. or higher and 50 ° C. or lower, preferably 30 ° C. or higher and 45 ° C. or lower in an environment of 20 ° C.
  • the temperature measurement method is Cairo Industry. It is designed to be based on the Cairo temperature measurement method at the feet.
  • the heat-generating material 4 is a material that can generate heat, and in the present embodiment, it is a powdery material that generates heat when it comes into contact with air.
  • the heat generating material 4 is enclosed in the bag body 2.
  • the heat generating material 4 includes, for example, an oxidizing metal, activated carbon, carbon black, a water retaining agent, a metal salt (for example, salt) and water.
  • the metal to be oxidized is a metal that generates heat of oxidation reaction, and examples thereof include one or more powders or fibers selected from iron, aluminum, zinc, manganese, magnesium and calcium, and among them, handleability.
  • Iron powder is preferable from the viewpoint of safety, manufacturing cost, storage stability and stability.
  • Examples of the iron powder include one or more selected from reduced iron powder and atomized iron powder.
  • the water retention agent include wood powder, vermiculite, diatomaceous earth, pearlite, silica gel, alumina, and a water-absorbent resin.
  • the composition used for the conventional disposable body warmer may be used as it is, and is not particularly limited.
  • the heat generating material 4 a material other than a material that generates heat due to contact with air may be used.
  • a material that generates heat when irradiated with microwaves in a microwave oven or the like for example, ceramic powder such as ferrite, red beans, etc. may be used.
  • the bag body 2 has a storage space inside for storing the heat generating material 4. As shown in FIG. 3A, the bag body 2 according to the present embodiment is formed flat and includes a front side sheet portion 21 and a back side sheet portion 22. In the bag body 2, a storage space is formed inside the front side sheet portion 21 and the back side sheet portion 22 by being joined by the joint portion 3.
  • the bag body 2 is formed in a substantially D-shape in front view having a width and a length.
  • a substantially rectangular shape in front view a square shape in front view, and a front view. It may be formed into a triangular shape, a polygonal shape in front view of a pentagon or more, a perfect circle shape in front view, an ellipse shape in front view, and the like, and the shape is not limited.
  • the front-side sheet portion 21 is a sheet-shaped portion that forms one surface of the bag body 2. As shown in FIG. 3A, the front side sheet portion 21 according to the present embodiment is made of one sheet material. The front side sheet portion 21 according to the present embodiment has flexibility. As a result, the foot heating element 1 can be deformed along the sole of the user's foot.
  • thermoplastic resin examples include polyethylene, polypropylene, polyester, polyamide, polyurethane, polystyrene, polyvinyl alcohol, polyvinyl chloride, polyvinylidene chloride, polycarbonate, ethylene-vinyl acetate copolymer and the like. These resins may be used alone or in combination of two or more.
  • the front side sheet portion 21 is provided with a woven cloth or a non-woven fabric on the outside of the resin film.
  • fiber materials for woven fabrics or non-woven fabrics include natural fibers such as cotton, linen, silk and paper, semi-synthetic fibers such as rayon and acetate, nylon, vinylon, polyester, acrylic, polyethylene, polypropylene, polyvinyl chloride and poly.
  • semi-synthetic fibers such as rayon and acetate, nylon, vinylon, polyester, acrylic, polyethylene, polypropylene, polyvinyl chloride and poly.
  • synthetic fibers such as butylene terephthalate and mixed fibers of these fibers.
  • nylon, polyester, and polypropylene are preferable as the fiber material from the viewpoint of improving the feel on the skin. These fiber materials may be used alone or in combination of two or more.
  • the basis weight of the woven fabric or the non-woven fabric is not particularly limited as long as it can prevent the heat-generating material 4 from leaking to the outside of the bag body 2, but as an example, 20 g / m 2 or more and 70 g / m 2 or less is exemplified.
  • the front side sheet portion 21 does not have to be a laminate of a resin film and a woven fabric or a non-woven fabric, and may be composed of a single resin film or a single woven fabric or non-woven fabric. Good.
  • the front side sheet portion 21 according to this embodiment has breathability.
  • the front side sheet portion 21 according to the present embodiment has a plurality of holes because the resin film is a porous resin film or a resin film having a plurality of holes (not shown) formed therein. .. Therefore, the front side sheet portion 21 can ventilate the inside and outside of the bag body 2 through the plurality of holes.
  • the plurality of holes may be formed evenly over the entire surface of the front side sheet portion 21, or may be formed densely in a part thereof. Further, the diameter of each hole may be a size that can suppress the heat generating material 4 from leaking through the hole, and as an example, 0.1 ⁇ m or more and 30 ⁇ m or less is exemplified.
  • the shape and quantity of the holes are not particularly limited. Since the sensible temperature of the foot heating element 1 changes according to the air volume of the bag body 2, the size, shape and quantity of the holes are the sensible temperature of the foot heating element 1 and the suppression of leakage of the heating material 4. It is set appropriately in consideration of the degree.
  • a plurality of holes may not be formed.
  • the front sheet portion 21 preferably has a constant moisture permeability.
  • Moisture permeability of the front seat 21 is preferably at 300g / (m 2 ⁇ day) or more 1000g / (m 2 ⁇ day) or less, 400g / (m 2 ⁇ day ) or more 900g / (m 2 ⁇ day) The following is more preferable.
  • the moisture permeability of the front sheet portion 21 is not particularly limited.
  • the back side sheet portion 22 is a sheet-shaped portion of the bag body 2 that forms a surface opposite to the front side sheet portion 21.
  • the back side sheet portion 22 according to the present embodiment is made of one sheet material.
  • the back side sheet portion 22 according to the present embodiment has flexibility like the front side sheet portion 21.
  • the back side sheet portion 22 is preferably composed of a laminate of a resin film and a woven fabric or a non-woven fabric as in the front side sheet portion 21, but is not limited to this and is composed of a single resin film. It may be composed of a single woven fabric or a non-woven fabric.
  • the back side sheet portion 22 according to this embodiment has breathability. Similar to the front side sheet portion 21, the back side sheet portion 22 according to the present embodiment is a back side sheet portion because the resin film is a porous resin film or a resin film having a plurality of holes (not shown) formed therein. 22 has a plurality of holes. However, the back side sheet portion 22 does not necessarily have to be breathable, and may be non-breathable.
  • each of the front side sheet portion 21 and the back side sheet portion 22 is not particularly limited, but is preferably 0.1 mm or more and 2.0 mm or less, for example.
  • the foot heating element 1 can be made soft and easily adapted to the sole 5, while it is possible to secure a certain strength that can withstand being continuously stepped on by the sole 5.
  • the back sheet portion 22 preferably has a constant moisture permeability.
  • the moisture permeability of the back side sheet portion 22 is preferably 300 g / (m 2 ⁇ day) or more and 1000 g / (m 2 ⁇ day) or less, and 400 g / (m 2 ⁇ day) or more and 900 g, like the front side sheet part 21. It is more preferably less than / (m 2 ⁇ day).
  • the moisture permeability of the back sheet portion 22 is not particularly limited.
  • the foot heating element 1 includes a non-slip portion 7.
  • the non-slip portion 7 prevents the foot heating element 1 from being displaced between the sole 5 of the user and the inner sole 61 of the shoe 6.
  • the non-slip portion 7 according to the present embodiment is composed of a plurality of small protrusions 71 formed on the back side sheet portion 22.
  • the plurality of small protrusions 71 are uniformly formed over the entire surface (outer surface) of the back side sheet portion 22, but in the present disclosure, they may be formed in at least a part of the region.
  • the small protrusion 71 is made of, for example, rubber or acrylic resin.
  • the non-slip portion 7 may be implemented by printing foam ink having a non-slip function on the back side sheet portion 22.
  • the anti-slip portion 7 may be formed not on the back side seat portion 22 but on the front side seat portion 21, or may be formed on both the back side seat portion 22 and the front side seat portion 21.
  • an adhesive layer may be provided instead of the non-slip portion 7.
  • the adhesive layer is provided on either the back side sheet portion 22 or the front side sheet portion 21.
  • the foot heating element 1 may be attached to the sole 5 of the user's foot for use, or may be attached to the inner sole 61 of the shoe 6 for use.
  • the joint portion 3 is a portion where the front side sheet portion 21 and the back side sheet portion 22 are joined.
  • the joint portion 3 according to the present embodiment is configured by welding (heat sealing) a part of the front side sheet portion 21 and a part of the back side sheet portion 22.
  • the joint portion 3 does not have to be welded, and may be realized by, for example, bonding, suturing, crimping, or the like, or may be realized by a combination thereof.
  • the joint portion 3 includes an edge portion 31 and a plurality of (here, two) projecting portions 32.
  • the edge portion 31 is a portion of the joint portion 3 formed along the outer circumference of the bag body 2.
  • the edge portion 31 according to the present embodiment is continuous over the entire outer circumference of the bag body 2.
  • the width dimension of the edge portion 31 is not particularly limited, but is preferably 1 mm or more and 10 mm or less, and more preferably 3 mm or more and 7 mm or less.
  • the edge portion 31 according to the present embodiment is formed to have substantially the same width dimension over the entire length.
  • the edge portion 31 connects a pair of first straight line portions 315 formed along the length direction, a second straight line portion 316 formed along the width direction, and a pair of first straight line portions 315.
  • An arcuate portion 317 is provided.
  • the pair of first straight line portions 315 are formed in a substantially straight line shape and are parallel to each other.
  • the protruding portion 32 is a portion of the joint portion 3 protruding from the edge portion 31 toward the heat generating material 4.
  • the protruding portion 32 protrudes from each first straight portion 315, so that the maximum temperature of the heating surface can be lowered and a locally high temperature rise can be suppressed.
  • the heat generating material 4 is less likely to move in the length direction inside the bag body 2, and the heat generating material 4 is less likely to be biased in the length direction.
  • the protruding portion 32 extends along the width direction of the bag body 2.
  • the width dimension H1 of the protruding portion 32 is substantially the same as the width dimension of the edge portion 31.
  • the protruding dimension of the protruding portion 32 (hereinafter, protruding dimension L1) is preferably set as follows from the viewpoint of lowering the maximum temperature of the heat generating surface and suppressing a locally high temperature rise. That is, the protrusion dimension L1 of the protrusion 32 is preferably 5% or more, more preferably 10% or more, with respect to the inner dimension D2 of the bag body 2 at the position corresponding to the protrusion 32 in the direction in which the protrusion 32 protrudes. It is set to 40% or less, more preferably 15% or more and 35% or less.
  • the "inner dimension D2 of the bag body 2 at the position corresponding to the protruding portion 32 in the direction in which the protruding portion 32 protrudes” as used in the present disclosure means that the protruding portion 32 is formed at a position where the protruding portion 32 is formed. It means the dimension from the position of the edge portion 31 to the position of the edge portion 31 facing the edge portion 31 when it is not assumed.
  • the “protruding dimension L1 of the protruding portion 32” here means the protruding dimension L1 of one protruding portion 32. Therefore, when the plurality of projecting portions 32 are located on the straight line T1, the "protruding dimension L1 of the projecting portion 32" means the projecting dimension of one of the plurality of projecting portions 32. ing.
  • the dimension D1 between the protruding portion 32 and the portion facing the protruding portion 32 in the direction in which the protruding portion 32 protrudes is the following condition.
  • the protrusion dimension L1 of the protrusion 32 is set. That is, the dimension D1 is set to be preferably 20% or more and 95% or less, more preferably 25% or more and 85% or less, and further preferably 30% or more and 70% or less with respect to the inner dimension D2.
  • the base points of the "inner dimension D2" and the “protruding dimension L1" are the centers in the width direction of the protruding portion 32 on the inner peripheral edge of the edge portion 31 (actually, an extension line of the inner peripheral edge forming the storage space). It is a point.
  • the "extension line of the inner peripheral edge forming the storage space” does not actually appear because the protruding portion 32 and the edge portion 31 are integrated, but the inner peripheral edges of the edge portions 31 on both sides of the protruding portion 32 are smoothly connected. It's a virtual line.
  • the "protruding dimension L1" is the maximum value of the distance between the line parallel to the inner peripheral edge of the edge portion 31 on which the protruding portion 32 is formed and having an intersection with the protruding portion 32 and the inner peripheral edge. .. Further, the "direction in which the protruding portion 32 protrudes” is a direction orthogonal to the inner peripheral edge when the inner peripheral edge of the edge portion 31 on which the protruding portion 32 is formed is linear, and the protruding portion 32 is formed. When the inner peripheral edge of the edge portion 31 is curved, it is a direction orthogonal to the tangent line of the inner peripheral edge at the center point in the width direction of the protruding portion 32 on the inner peripheral edge of the edge portion 31. In the present embodiment, since the inner peripheral edge of the edge portion 31 on which the protruding portion 32 is formed is linear, the "direction in which the protruding portion 32 protrudes” is parallel to the width direction of the foot heating element 1.
  • the pair of protrusions 32 are located on the straight line T1.
  • the dimension D1 starts from the inner dimension D2.
  • the dimension is obtained by subtracting the protrusion dimension L1 of the protrusion 32.
  • D1 D2-L1.
  • the "dimension D1" is one of the plurality of line segments. Use the shortest line segment size.
  • the protrusion dimension L1 and the width dimension H1 of the protrusion 32 are not particularly limited. Further, the protruding direction of the protruding portion 32 does not have to be along the width direction of the bag body 2, and may be inclined with respect to the width direction, for example.
  • the protruding portion 32 is formed at the boundary portion between the first straight portion 315 and the arcuate portion 317.
  • the protruding portion 32 may be provided on any of the first straight line portion 315, the arcuate portion 317, and the second straight line portion 316.
  • the pair of protrusions 32 are located on a straight line T1 in this embodiment. That is, the protruding directions of the plurality of projecting portions 32 are along the straight line T1.
  • the heat generating material 4 since the heat generating material 4 does not exist in the portion where the protruding portion 32 is located, it is easy to bend along the straight line T1 at the position of the protruding portion 32.
  • the joint portion 3 is formed with a plurality of (here, two) dents 33 that are recessed from the outer edge of the bag body 2.
  • the recess 33 according to the present embodiment is a notch formed at a portion corresponding to the protruding portion 32.
  • the recess 33 may be formed at the time of molding the sheet material, or may be cut out after the bag body 2 is formed.
  • the peripheral edge of the recess 33 is formed in an arc shape, but may be formed in an acute angle or an obtuse angle, and is not particularly limited.
  • the recess 33 is formed at the portion corresponding to the protruding portion 32, the joint strength of the joint portion 3 is maintained, and the portion corresponding to the protruding portion 32 is easily bent. Become.
  • the protruding portion 32 is provided on the heating material 4 side from the edge portion 31 formed along at least a part of the outer circumference of the bag body 2. Stick out. According to this, in the heating element 1, the maximum temperature of the heat generating surface can be lowered, and a locally high temperature rise can be suppressed.
  • the protruding portion 32 in the central portion in the length direction of the bag body 2, the maximum temperature is lowered and the high temperature region is increased, so that the temperature distribution can be made uniform and the feet can be spread over a wide range. Can be warmed up.
  • the protruding portion 32 at a position biased toward one end side in the length direction of the bag body 2, the maximum temperature is lowered and the high temperature region moves from the central portion in the length direction of the bag body 3. Therefore, for example, it is possible to aim and warm the toes (fingertips).
  • the heat generating material 4 enclosed in the bag body 2 is hindered from moving by the protruding portion 32. Therefore, in the foot heating element 1 according to the present embodiment, even if the foot 5 is stepped on, the heating material 4 is unlikely to be biased inside the bag body 2. Further, the foot heating element 1 according to the present embodiment is easy to bend at a portion along the protruding portion 32 and is easy to fit along the foot 5.
  • the protruding dimension L1 of the protruding portion 32 is relative to the inner dimension D2 of the bag body 2 at the position corresponding to the protruding portion 32 in the direction in which the protruding portion 32 protrudes. It is 15% or more and 35% or less. Therefore, more effectively, in the heating element 1, the maximum temperature of the heating surface can be lowered, a locally high temperature rise can be suppressed, and the heat generating material 4 can be suppressed from being biased inside the bag body 2. be able to.
  • the dimension D1 between the protruding portion 32 and the portion facing the protruding portion 32 is a position corresponding to the protruding portion 32 in the direction in which the protruding portion 32 protrudes. It is 30% or more and 70% or less with respect to the inner size D2 of the bag body 2 in the above. Therefore, according to this aspect, it is possible to secure a certain thermal effect in the foot heating element 1.
  • the foot heating element 1 includes a plurality of protruding portions 32, and the protruding directions of the plurality of protruding portions 32 are along a straight line T1. Therefore, the foot heating element 1 is likely to bend along the straight line T1, and the foot heating element 1 is more easily deformed along the foot 5.
  • a dent is formed at a portion corresponding to the protruding portion 32 on the outer edge of the bag body 2. Therefore, the foot heating element 1 is more likely to bend along the straight line T1, and the foot heating element 1 is more easily deformed along the foot 5.
  • the foot heating element 1 is formed in a substantially D-shape in front view, but may be formed in a shape along the inner sole 61 of the shoe 6 as shown in FIG.
  • the foot heating element 1 according to the modified example 1-1 has two pairs of protrusions 32.
  • the pair of protrusions 32 are located on a straight line T1.
  • the pair of protruding portions 32 of the two sets are separated from each other in the length direction of the foot heating element 1.
  • the protrusion dimension L1 of the protrusion 32 is preferably set to 5% or more, more preferably 10% or more and 40% or less, and further preferably 15% or more and 35% or less with respect to the inner size D2. Further, the protruding dimension of the protruding portion 32 is such that the dimension D1 is preferably 20% or more and 95% or less, more preferably 25% or more and 85% or less, and further preferably 30% or more and 70% or less with respect to the inner dimension D2. L1 is set.
  • the base points of the "inner dimension D2" and the “protruding dimension L1" are the centers in the width direction of the protruding portion 32 on the inner peripheral edge of the edge portion 31 (actually, an extension line of the inner peripheral edge forming the storage space). It is a point.
  • the "extension line of the inner peripheral edge forming the storage space” does not actually appear because the protruding portion 32 and the edge portion 31 are integrated, but the inner peripheral edges of the edge portions 31 on both sides of the protruding portion 32 are smoothly connected. It's a virtual line.
  • the foot heating element 1 according to the modified example 1-1 can also have the same effect as that of the above embodiment.
  • the foot heating element 1 according to the above embodiment is formed in a substantially D-shape in front view, but may be formed in a rectangular shape in front view as shown in FIG.
  • the edge portion 31 has a pair of long side portions 311 formed along the length direction and a pair of short side portions 312 formed along the width direction. And four corner portions 313.
  • the pair of long side portions 311 are formed in a substantially linear shape and are parallel to each other.
  • the pair of short side portions 312 are curved so as to bulge outward in the length direction, but may be formed in a straight line.
  • Each corner portion 313 connects the end of one long side portion 311 and the end of one short side portion 312.
  • the corner portion 313 is formed in a rounded corner shape, but may be formed in a C chamfered shape, an obtuse angle shape, an acute angle shape, or the like, for example.
  • Each protruding portion 32 protrudes from each long side portion 311 toward the heat generating material 4 side, and is located on a straight line T1.
  • the protrusion dimension L1 of the protrusion 32 is preferably set to 5% or more, more preferably 10% or more and 40% or less, and further preferably 15% or more and 35% or less with respect to the inner size D2. Further, the protruding dimension of the protruding portion 32 is such that the dimension D1 is preferably 20% or more and 95% or less, more preferably 25% or more and 85% or less, and further preferably 30% or more and 70% or less with respect to the inner dimension D2. L1 is set.
  • the foot heating element 1 according to the modified example 1-2 can also have the same effect as that of the above embodiment.
  • the foot heating element 1 is formed in a substantially D-shape in front view, but may be formed in an oval shape in front view as shown in FIG.
  • the "oval” as used in the present disclosure means a circle extending in one direction, and includes, for example, an egg shape, an ellipse shape, an oval shape, a rounded rectangle, and the like.
  • the edge portion 31 is formed in a curved shape.
  • the protruding portion 32 protrudes from the edge portion 31 toward the heat generating material 4.
  • the protrusion dimension L1 of the protrusion 32 is preferably set to 5% or more, more preferably 10% or more and 40% or less, and further preferably 15% or more and 35% or less with respect to the inner size D2.
  • the protruding dimension of the protruding portion 32 is such that the dimension D1 is preferably 20% or more and 95% or less, more preferably 25% or more and 85% or less, and further preferably 30% or more and 70% or less with respect to the inner dimension D2. L1 is set.
  • the base points of the "inner dimension D2" and the “protruding dimension L1" are the centers in the width direction of the protruding portion 32 on the inner peripheral edge of the edge portion 31 (actually, an extension line of the inner peripheral edge forming the storage space). It is a point.
  • the "extension line of the inner peripheral edge forming the storage space” does not actually appear because the protruding portion 32 and the edge portion 31 are integrated, but the inner peripheral edges of the edge portions 31 on both sides of the protruding portion 32 are smoothly connected. It's a virtual line.
  • the foot heating element 1 according to the modified example 1-3 can also have the same effect as that of the above embodiment.
  • the protrusion dimension L1 of the protrusion 32 is preferably set to 5% or more, more preferably 10% or more and 40% or less, and further preferably 15% or more and 35% or less with respect to the inner size D2. Further, the protruding dimension of the protruding portion 32 is such that the dimension D1 is preferably 20% or more and 95% or less, more preferably 25% or more and 85% or less, and further preferably 30% or more and 70% or less with respect to the inner dimension D2. L1 is set.
  • the foot heating element 1 according to the second modification can also have the same effect as that of the above embodiment.
  • the protrusion dimension L1 of the protrusion 32 is preferably set to 5% or more, more preferably 10% or more and 40% or less, and further preferably 15% or more and 35% or less with respect to the inner size D2. Further, the protruding dimension of the protruding portion 32 is such that the dimension D1 is preferably 20% or more and 95% or less, more preferably 25% or more and 85% or less, and further preferably 30% or more and 70% or less with respect to the inner dimension D2. L1 is set.
  • the foot heating element 1 according to the modified example 3-1 can also have the same effect as that of the above embodiment.
  • the protruding portions 32 are formed on each of the pair of long side portions 311. However, although not particularly shown, of the four corner portions 313 (see FIG. 5). Protruding portions 32 may be formed on a pair of diagonal corner portions 313.
  • the protruding portion 32 protrudes from the edge portion 31 along a diagonal line as a straight line.
  • the pair of protrusions 32 are located diagonally.
  • the foot heating element 1 according to the modified example 3-2 can also exert the same effect as that of the above embodiment.
  • the protruding portion 32 may protrude from the short side portion 312 of the edge portion 31.
  • the bag body 2 is formed by superimposing two sheet materials having the same shape and then joining the outer circumferences thereof to form a bag shape. As shown in FIG. One sheet material may be folded and then the three sides thereof may be joined to form a bag shape. In the foot heating element 1 according to the modified example 4, the edge portion 31 is formed along three of the four sides of the bag body 2.
  • one surface of the bag body 2 is the front side sheet portion 21, and the opposite surface is the back side sheet portion 22.
  • the front side sheet portion 21 and the back side sheet portion 22 are integrally formed.
  • the portion pointed to by reference numeral 34 in FIG. 9 is a bent portion. From the viewpoint of ensuring strength, the bent portion 34 may be welded.
  • the protrusion dimension L1 of the protrusion 32 is preferably set to 5% or more, more preferably 10% or more and 40% or less, and further preferably 15% or more and 35% or less with respect to the inner size D2. Further, the protruding dimension of the protruding portion 32 is such that the dimension D1 is preferably 20% or more and 95% or less, more preferably 25% or more and 85% or less, and further preferably 30% or more and 70% or less with respect to the inner dimension D2. L1 is set.
  • the foot heating element 1 according to the modified example 4 can also exert the same effect as the foot heating element 1 according to the above embodiment.
  • a bag-shaped bag body 2 may be formed by using a sheet material in which the back side sheet portion 22 and the front side sheet portion 21 are connected in a tubular shape and joining the two sides thereof. Further, from the viewpoint of ensuring strength, the remaining two sides may be welded.
  • the protruding portion 32 is formed in a semicircular shape as shown in FIG. 10 (A), and the inside corner formed by the edge portion 31 and the protruding portion 32.
  • the parts have corners rather than curves that connect smoothly.
  • the center of the arc forming the edge on the heat generating material 4 side of the protrusion 32 is located on the edge portion 31 or on the heat generating material 4 side of the edge portion 31.
  • the protruding portion 32 is formed in a substantially rectangular shape as shown in FIG. 10B, and the protruding corner of the protruding portion 32 on the tip side in the protruding direction.
  • the part 321 is substantially a right angle.
  • the protruding portion 32 includes a convex portion 322 and a triangular portion 323 as shown in FIG. 10 (C).
  • the convex portion 322 is the base portion of the protruding portion 32.
  • the triangular portion 323 protrudes from the tip surface of the convex portion 322 in the protruding direction in the protruding direction.
  • the triangular portion is sharpened so as to become narrower toward the tip.
  • the protruding portion 32 is formed in a substantially triangular shape as shown in FIG. 10 (D).
  • the protruding portion 32 is sharpened so as to become narrower toward the protruding direction.
  • the foot heating element 1 is arranged between the sole 51 of the user and the inner sole 61 of the shoe 6, but in the present disclosure, the heating element 1 for the foot is arranged between the instep of the foot 5 and the shoe 6. It may be arranged between the side surface of the foot 5 and the shoe 6.
  • the foot heating element 1 according to the above embodiment has two protrusions 32, but may have three or more protrusions 32.
  • the protruding portion 32 is formed in the central portion of the bag body 2 in the length direction, but the protruding portion 32 is biased toward one end side in the length direction. It may be formed in position.
  • the heating element 1 according to the above embodiment and each modification has a recess 33 at a position corresponding to the protrusion 32, but the recess 33 may not be present.
  • a heating element having a protruding portion at the joint portion is manufactured, and as a comparative example, a heating element having no protruding portion at the joint portion is manufactured, and the temperature of the heat generating surface at the time of heat generation is photographed by thermography. Then, the temperature distribution was compared.
  • the heating material and the material of the bag body were the same as those in the above embodiment, and all common materials were used. Further, the amount of the heat generating material of each of Examples 1 to 3 and Comparative Example was set to 70 g, and all of them had a common weight.
  • the protruding dimension L2 of the portion was set to 20 mm.
  • FIG. 12 shows the results (result 1) of the examples 1 and 2 and the comparative example taken side by side using thermography.
  • the area in each temperature range is calculated from the result of photographing by thermography, and the relationship between each temperature range and the area ratio to the whole in the temperature range is shown in Table 1-1.
  • Table 1-2 shows the area ratio of the high temperature range (the temperature range of the maximum temperature of -5 ° C or higher and lower than the maximum temperature) extracted from Table 1-1.
  • FIG. 13 shows the result (result 2) of taking a picture using thermography by arranging Examples 2 and 3 and the comparative example side by side at a different shooting location from the result 1. Further, the area in each temperature range is calculated from the result of photographing by thermography, and the relationship between each temperature range and the area ratio to the whole in the temperature range is shown in Table 2-1. Table 2-2 shows the area ratio of the high temperature region extracted from Table 2-1.
  • FIG. 14 A graph of Table 1-1 is shown in FIG. 14, and a graph of Table 2-1 is shown in FIG. In the graph, the vertical axis is the area ratio (%) and the horizontal axis is the temperature (° C.).
  • Result 1 as can be seen from FIG. 12, in the comparative example, a white portion showing a high temperature is dark and clearly present in the center of the heating surface, but in the heating element according to Examples 1 and 2, the white portion is larger than that in the comparative example. Is also getting thinner. Further, as can be seen from Table 1-1, Table 1-2 and FIG. 14, the heating elements according to Examples 1 and 2 have an increased area ratio in the high temperature region and are the highest as compared with the comparative examples. The temperature dropped by 1 ° C to 2 ° C.
  • the maximum temperature can be lowered while maintaining the area ratio of the high temperature region on the heat generating surface to be equal to or higher than that of the comparative example. In short, in the heating elements according to Examples 1 to 3, it is possible to suppress a locally high temperature rise on the heat generating surface.
  • the area ratio in the high temperature region increased by about 3.4 to 6.7% as compared with the comparative example.
  • the maximum temperature was 1 ° C to 2 ° C lower than that of the comparative example. Therefore, it can be seen that when the protruding portion is arranged at a position corresponding to the central portion of the heat generating surface, the maximum temperature of the heat generating surface can be lowered and the area of the high temperature region can be widened as compared with the comparative example. That is, by arranging the protruding portion at a position corresponding to the central portion of the heat generating surface, the uniformity of the temperature distribution of the heat generating surface can be improved.
  • the difference in the maximum temperature is about 1 to 2 ° C. as compared with the comparative example, whereas the difference in the average temperature is 0. It was 1 to 0.6 ° C. That is, in the heating elements according to Examples 1 and 2, the decrease in the average temperature was smaller than the decrease in the maximum temperature in comparison with the comparative example. That is, by arranging the protruding portion at a position corresponding to the central portion of the heat generating surface, it is possible to suppress the decrease in the average temperature while lowering the maximum temperature of the heat generating surface.
  • the high temperature region moved to a position biased to the side opposite to the protruding portion in the length direction as compared with the comparative example. That is, it was found that the high temperature region can be moved from the central portion in the length direction of the bag body by forming the protruding portion at a position biased toward one end side in the length direction of the bag body.

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Abstract

Provided is a foot warmer that resists uneven distribution of an exothermic material within a pack and has a reduced maximum temperature on the warming surface, and in which localized high increases in temperature can be suppressed. A foot warmer 1 is disposed between a user's foot and a shoe. The foot warmer 1 comprises: a pack 2 formed into a pouch shape via a front sheet 21 and a rear sheet 22; and an exothermic material 4 sealed within the pack 2. The pack 2 has a joined part 3 where the front sheet 21 and the rear sheet 22 are joined. The joined part 3 includes an edge part 31 formed along at least a portion of the outer periphery of the pack 2, and a projecting part 32 that projects from the edge part 31 toward the exothermic material 4.

Description

足元用発熱体Heating element for feet
　本発明は、足元用発熱体に関する。 The present invention relates to a heating element for feet.
　特許文献１には、従来の発熱体が開示されている。特許文献１に記載の発熱体は、空気と接触することで発熱する発熱性組成物（発熱材料）と、発熱性組成物を収納する収納袋（袋体）と、を備える。収納袋は、２枚のシート材を重ね合わせ、外周縁部をシールすることで袋状に形成されている。 Patent Document 1 discloses a conventional heating element. The heating element described in Patent Document 1 includes a heat-generating composition (heating material) that generates heat when it comes into contact with air, and a storage bag (bag body) that stores the heat-generating composition. The storage bag is formed in a bag shape by stacking two sheet materials and sealing the outer peripheral edge portion.
特開平１１－３５４号公報Japanese Unexamined Patent Publication No. 11-354
　例えば、農作業、市場、雪山等の冬場の寒い屋外環境では、足元が冷えるため、上記特許文献１に記載の発熱体を、足裏と靴の内底との間に配置して使用することがある。 For example, in a cold outdoor environment such as farm work, a market, or a snowy mountain in winter, the feet get cold. Therefore, the heating element described in Patent Document 1 can be used by arranging it between the sole of the foot and the inner sole of the shoe. is there.
　しかし、上記特許文献１に記載の発熱体では、靴の内部で発熱体が足に密着した状態となるため、歩行の際に発熱性組成物が袋体の内部で移動しやすく、袋体の内部において発熱性組成物が一端部側に片寄ってしまうことがある。また、発熱面の温度分布を見ると、正面から見て中央部の温度が比較的高くなる傾向があるが、足元用発熱体は足と靴内面との間に挟まれるため、発熱面において、局所的な高い温度上昇が生じることはあまり好ましくない。足元用発熱体の発熱面における局所的な高い温度上昇に対しては、従前より様々な対策が講じられているが、より良い対策が望まれている。 However, in the heating element described in Patent Document 1, since the heating element is in close contact with the foot inside the shoe, the heat-generating composition easily moves inside the bag body during walking, and the bag body Inside, the exothermic composition may be biased toward one end. Also, looking at the temperature distribution on the heat generating surface, the temperature in the central part tends to be relatively high when viewed from the front, but since the heating element for feet is sandwiched between the foot and the inner surface of the shoe, on the heat generating surface, It is less desirable that a high local temperature rise occurs. Various measures have been taken for the local high temperature rise on the heating surface of the heating element for feet, but better measures are desired.
　本発明は、上記事情に鑑みてなされ、袋体の内部において、発熱材料が片寄りにくく、かつ発熱面の最高温度を下げて局所的な高い温度上昇を抑えることができる足元用発熱体を提供することを目的とする。 INDUSTRIAL APPLICABILITY The present invention has been made in view of the above circumstances, and provides a heating element for feet, which is capable of preventing the heating material from shifting inside the bag body and lowering the maximum temperature of the heating surface to suppress a locally high temperature rise. The purpose is to do.
　本発明に係る一態様の足元用発熱体は、ユーザの足と靴との間に配置される足元用発熱体であって、表側シート部及び裏側シート部で袋状に形成された袋体と、前記袋体に封入された発熱材料と、を備える。前記袋体は、前記表側シート部と前記裏側シート部とが接合された接合部を有する。前記接合部は、前記袋体の外周の少なくとも一部に沿って形成された縁部と、前記縁部から前記発熱材料側に突き出る突出部と、を含む。 The foot heating element according to the present invention is a foot heating element arranged between a user's foot and shoes, and is a bag-shaped body formed by a front side sheet portion and a back side sheet portion. , A heat-generating material enclosed in the bag body. The bag body has a joint portion in which the front side sheet portion and the back side sheet portion are joined. The joint portion includes an edge portion formed along at least a part of the outer periphery of the bag body, and a protruding portion protruding from the edge portion toward the heat generating material side.
　また、前記足元用発熱体では、前記突出部の突出寸法は、前記突出部が突き出る方向における前記突出部に対応する位置での前記袋体の内寸に対して、１５％以上３５％以下であることが好ましい。 Further, in the foot heating element, the protruding dimension of the protruding portion is 15% or more and 35% or less with respect to the inner dimension of the bag body at the position corresponding to the protruding portion in the direction in which the protruding portion protrudes. It is preferable to have.
　また、前記足元用発熱体は、前記突出部が突き出る方向において、前記突出部と、当該突出部に対向する部分との間の寸法は、前記突出部に対応する位置での前記袋体の内寸に対して、３０％以上７０％以下であることが好ましい。 Further, in the foot heating element, the dimension between the protruding portion and the portion facing the protruding portion in the direction in which the protruding portion protrudes is the inside of the bag body at a position corresponding to the protruding portion. It is preferably 30% or more and 70% or less with respect to the dimension.
　また、前記足元用発熱体は、前記突出部を複数含み、前記複数の突出部の突き出る方向が一直線に沿っていることが好ましい。 Further, it is preferable that the foot heating element includes a plurality of the protrusions and the protruding directions of the plurality of protrusions are in a straight line.
　また、前記足元用発熱体は、袋体の外縁には、前記突出部に対応する箇所に凹みが形成されていることが好ましい。 Further, in the foot heating element, it is preferable that a recess is formed in a portion corresponding to the protruding portion on the outer edge of the bag body.
　本発明に係る上記態様の足元用発熱体は、袋体の内部において発熱材料が片寄りにくく、かつ発熱面の最高温度を下げて局所的な高い温度上昇を抑えることができる、という利点がある。 The heating element for feet according to the above aspect of the present invention has an advantage that the heating material is less likely to be biased inside the bag body, and the maximum temperature of the heating surface can be lowered to suppress a locally high temperature rise. ..
図１は、本発明の一実施形態に係る足元用発熱体の使用状態の断面図である。FIG. 1 is a cross-sectional view of a usage state of a foot heating element according to an embodiment of the present invention. 図２は、同上の足元用発熱体の正面図である。FIG. 2 is a front view of the same heating element for feet. 図３（Ａ）は、図２におけるＡ－Ａ線断面図である。図３（Ｂ）は、同上の足元用発熱体の底面図である。FIG. 3A is a cross-sectional view taken along the line AA in FIG. FIG. 3B is a bottom view of the same heating element for feet. 図４は、変形例１－１の発熱体の正面図である。FIG. 4 is a front view of the heating element of the modified example 1-1. 図５は、変形例１－２の発熱体の正面図である。FIG. 5 is a front view of the heating element of the modified example 1-2. 図６は、変形例１－３の発熱体の正面図である。FIG. 6 is a front view of the heating element of the modified example 1-3. 図７は、変形例２の発熱体の正面図である。FIG. 7 is a front view of the heating element of the modified example 2. 図８は、変形例３－１の発熱体の正面図である。FIG. 8 is a front view of the heating element of the modified example 3-1. 図９は、変形例４の発熱体の正面図である。FIG. 9 is a front view of the heating element of the modified example 4. 図１０（Ａ）は、変形例５－１に係る発熱体の突出部の拡大図である。図１０（Ｂ）は、変形例５－２に係る発熱体の突出部の拡大図である。図１０（Ｃ）は、変形例５－３に係る発熱体の突出部の拡大図である。図１０（Ｄ）は、変形例５－４に係る発熱体の突出部の拡大図である。図１０（Ｅ）は、変形例５－５に係る発熱体の突出部の拡大図である。FIG. 10A is an enlarged view of a protruding portion of the heating element according to the modified example 5-1. FIG. 10B is an enlarged view of a protruding portion of the heating element according to the modified example 5-2. FIG. 10C is an enlarged view of a protruding portion of the heating element according to the modified example 5-3. FIG. 10D is an enlarged view of a protruding portion of the heating element according to the modified example 5-4. FIG. 10 (E) is an enlarged view of a protruding portion of the heating element according to the modified example 5-5. 図１１（Ａ）は、実施例１に係る発熱体の正面図である。図１１（Ｂ）は、実施例２に係る発熱体の正面図である。図１１（Ｃ）は、実施例３に係る発熱体の正面図である。図１１（Ｄ）は、比較例に係る発熱体の正面図である。FIG. 11A is a front view of the heating element according to the first embodiment. FIG. 11B is a front view of the heating element according to the second embodiment. FIG. 11C is a front view of the heating element according to the third embodiment. FIG. 11D is a front view of the heating element according to the comparative example. 図１２は、結果１に係る温度分布を示す図である。FIG. 12 is a diagram showing the temperature distribution according to the result 1. 図１３は、結果２に係る温度分布を示す図である。FIG. 13 is a diagram showing the temperature distribution according to the result 2. 図１４は、結果１に係る温度分布を示すグラフである。FIG. 14 is a graph showing the temperature distribution according to the result 1. 図１５は、結果２に係る温度分布を示すグラフである。FIG. 15 is a graph showing the temperature distribution according to the result 2.
　（１）実施形態
　（１．１）概要
　本実施形態に係る足元用発熱体１は、図１に示すように、ユーザの足５（足の指先を含む）と靴６との間に配置され、ユーザの足５に対して部分的に温熱効果を与えることができるものである。本実施形態に係る発熱体１は、袋状に形成された袋体２と、袋体２に封入された発熱材料４と、を備える。 (1) Embodiment (1.1) Outline As shown in FIG. 1, the foot heating element 1 according to the present embodiment is arranged between the user's foot 5 (including the toe tip) and the shoe 6. , It is possible to partially give a thermal effect to the user's foot 5. The heating element 1 according to the present embodiment includes a bag-shaped bag body 2 and a heat-generating material 4 enclosed in the bag body 2.
　袋体２は、表側シート部２１と、裏側シート部２２と、で袋状に形成されており、少なくとも一部において接合部３を有する。接合部３は、表側シート部２１と裏側シート部２２とが接合された部分のことである。本実施形態に係る接合部３は、図２に示すように、縁部３１と、突出部３２と、を含む。 The bag body 2 is formed in a bag shape by the front side sheet portion 21 and the back side sheet portion 22, and has a joint portion 3 at least in a part thereof. The joint portion 3 is a portion where the front side sheet portion 21 and the back side sheet portion 22 are joined. As shown in FIG. 2, the joint portion 3 according to the present embodiment includes an edge portion 31 and a protruding portion 32.
　縁部３１は、袋体２の外周の少なくとも一部（本実施形態では、袋体２の外周の全長）に沿って形成されている。突出部３２は、縁部３１から発熱材料４側に突き出ている。 The edge portion 31 is formed along at least a part of the outer circumference of the bag body 2 (in the present embodiment, the total length of the outer circumference of the bag body 2). The protruding portion 32 protrudes from the edge portion 31 toward the heat generating material 4.
　本実施形態に係る足元用発熱体１では、突出部３２を有さない足元用発熱体に比べて、発熱面において、高温域の面積を同等以上に保ちながら、最高温度を下げることができる。したがって、本実施形態に係る発熱体１では、発熱面の最高温度を下げ、局所的な高い温度上昇を抑えることができる。 In the foot heating element 1 according to the present embodiment, the maximum temperature can be lowered while keeping the area of the high temperature region equal to or higher than that of the foot heating element having no protruding portion 32. Therefore, in the heating element 1 according to the present embodiment, the maximum temperature of the heat generating surface can be lowered, and a locally high temperature rise can be suppressed.
　本開示にいう「高温域」とは、発熱面の温度域のうち、（最高温度－５℃）以上でかつ最高温度以下の温度域を意味する。また、本開示で言う「発熱面」とは、袋体２において、袋体２の表面のうち、縁部３１に囲まれた部分を意味する。本実施形態に係る足元用発熱体１では、表側シート部２１と裏側シート部２２との各々が発熱面を有しており足元用発熱体１の正面図及び背面図が、発熱面を正面から見た方向である。 The "high temperature range" referred to in the present disclosure means a temperature range above (maximum temperature -5 ° C) and below the maximum temperature in the temperature range of the heat generating surface. Further, the "heating surface" referred to in the present disclosure means a portion of the surface of the bag body 2 surrounded by the edge portion 31 in the bag body 2. In the foot heating element 1 according to the present embodiment, each of the front side seat portion 21 and the back side seat portion 22 has a heating surface, and the front view and the rear view of the foot heating element 1 show the heating surface from the front. The direction you saw.
　また、本実施形態に係る足元用発熱体１では、袋体２の内部において、突出部３２によって発熱材料４の移動が妨げられるため、発熱材料４の片寄りが抑えられる。したがって、ユーザの足５と靴６との間に足元用発熱体１が配置されて、歩行の際、足５を振ったり、足裏５１で発熱材料４を踏んだりしても、本実施形態に係る足元用発熱体１では、袋体２の内部において、発熱材料４が片寄りにくい。 Further, in the foot heating element 1 according to the present embodiment, the heat generating material 4 is prevented from moving due to the protruding portion 32 inside the bag body 2, so that the heating material 4 is suppressed from being biased. Therefore, even if the foot heating element 1 is arranged between the user's foot 5 and the shoe 6 and the foot 5 is shaken or the foot sole 51 steps on the heat generating material 4 during walking, the present embodiment In the foot heating element 1 according to the above, the heating material 4 is unlikely to be biased inside the bag body 2.
　（１．２）詳細
　以下、本実施形態に係る足元用発熱体１について、詳細に説明する。足元用発熱体１は、図１に示すように、ユーザの足５と靴６との間に配置されて用いられる。本実施形態では、ユーザの足裏５１のうちの指先側の部分と、靴６の内底６１のつま先側の部分と、の間に配置される。靴６としては、例えば、運動靴、スニーカー、シューズ、革靴、長靴、ブーツ（ロングブーツを含む）、スリッパ等が挙げられるが、特に制限されない。また、本開示でいう「ユーザの足５」とは、靴下、ストッキング、タイツ等を着用した状態の足又は素足を意味する。 (1.2) Details Hereinafter, the foot heating element 1 according to the present embodiment will be described in detail. As shown in FIG. 1, the foot heating element 1 is used by being arranged between the user's foot 5 and the shoe 6. In the present embodiment, it is arranged between the fingertip side portion of the user's sole 51 and the toe side portion of the inner sole 61 of the shoe 6. Examples of the shoe 6 include athletic shoes, sneakers, shoes, leather shoes, boots, boots (including long boots), slippers, and the like, but are not particularly limited. Further, the “user's foot 5” as used in the present disclosure means a foot or bare foot while wearing socks, stockings, tights, or the like.
　本実施形態に係る足元用発熱体１は、酸化反応が起こるときに生じる反応熱を熱源として利用する足元用の発熱体であり、例えば、使い捨てカイロである。足元用発熱体１は、例えば、使用前には、空気を通さない気密性を有する外袋（不図示）に収容されている。 The foot heating element 1 according to the present embodiment is a foot heating element that utilizes the heat of reaction generated when an oxidation reaction occurs as a heat source, and is, for example, a disposable body warmer. The foot heating element 1 is housed in, for example, an airtight outer bag (not shown) that does not allow air to pass through before use.
　本実施形態に係る足元用発熱体１は、図２に示すように、正面視略Ｄ字状に形成されている。足元用発熱体１は、前方向の端が円弧状に形成されており、後方向の端が左右方向に沿って直線状に形成されている。以下では、前後方向に平行な方向を「長さ方向」として定義し、長さ方向に直交する左右方向に平行な方向を「幅方向」として定義する。なお、これらの方向の定義は、足元用発熱体１の使用態様を限定する趣旨ではない。図面中の各方向を示す矢印は、説明のために表記しているに過ぎず、実体を伴わない。 As shown in FIG. 2, the foot heating element 1 according to the present embodiment is formed in a substantially D-shape in front view. The foot heating element 1 has a front end formed in an arc shape and a rear end formed in a straight line along the left-right direction. In the following, the direction parallel to the front-rear direction is defined as the "length direction", and the direction parallel to the left-right direction orthogonal to the length direction is defined as the "width direction". It should be noted that the definitions of these directions are not intended to limit the usage mode of the foot heating element 1. The arrows indicating each direction in the drawing are shown for the sake of explanation only and are not accompanied by substance.
　本実施形態に係る足元用発熱体１は、正面視略Ｄ字状に形成されているが、後述の「（３）変形例」でも示すように、形状は特に制限されない。 The foot heating element 1 according to the present embodiment is formed in a substantially D-shape in front view, but the shape is not particularly limited as shown in "(3) Deformation example" described later.
　足元用発熱体１では、通常、足元を温める目的で使用する場合、その発熱温度が２０℃環境下で２５℃以上５０℃以下、好ましくは３０℃以上４５℃以下（測温方法は、カイロ工業会足もとカイロ測温方法に準拠）になるように、設計される。 When the heating element 1 for feet is usually used for the purpose of warming the feet, the heat generation temperature is 25 ° C. or higher and 50 ° C. or lower, preferably 30 ° C. or higher and 45 ° C. or lower in an environment of 20 ° C. (The temperature measurement method is Cairo Industry. It is designed to be based on the Cairo temperature measurement method at the feet.
　（１．２．１）発熱材料
　発熱材料４は、発熱し得る材料であり、本実施形態では、空気と接触することで発熱する粉状の材料である。発熱材料４は、袋体２に封入されている。 (1.2.1) Heat-generating material The heat-generating material 4 is a material that can generate heat, and in the present embodiment, it is a powdery material that generates heat when it comes into contact with air. The heat generating material 4 is enclosed in the bag body 2.
　発熱材料４としては、例えば、被酸化性金属、活性炭、カーボンブラック、保水剤、金属塩（例えば、食塩）及び水を含む。被酸化性金属は、酸化反応熱を発する金属であり、例えば、鉄、アルミニウム、亜鉛、マンガン、マグネシウム及びカルシウムから選ばれる１種又は２種以上の粉末又は繊維が挙げられ、この中でも、取り扱い性、安全性、製造コスト、保存性及び安定性の観点から、鉄粉が好ましい。鉄粉としては、例えば、還元鉄粉及びアトマイズ鉄粉から選ばれる１種又は２種以上が挙げられる。保水剤としては、例えば、木粉、バーミキュライト、けい藻土、パーライト、シリカゲル、アルミナ、吸水性樹脂等が挙げられる。ただし、発熱材料４としては、従来の使い捨てカイロに用いられている組成物をそのまま用いてもよく、特に制限されない。 The heat generating material 4 includes, for example, an oxidizing metal, activated carbon, carbon black, a water retaining agent, a metal salt (for example, salt) and water. The metal to be oxidized is a metal that generates heat of oxidation reaction, and examples thereof include one or more powders or fibers selected from iron, aluminum, zinc, manganese, magnesium and calcium, and among them, handleability. Iron powder is preferable from the viewpoint of safety, manufacturing cost, storage stability and stability. Examples of the iron powder include one or more selected from reduced iron powder and atomized iron powder. Examples of the water retention agent include wood powder, vermiculite, diatomaceous earth, pearlite, silica gel, alumina, and a water-absorbent resin. However, as the heat generating material 4, the composition used for the conventional disposable body warmer may be used as it is, and is not particularly limited.
　発熱材料４としては、空気との接触により発熱する材料以外を用いてもよい。発熱材料４としては、例えば、電子レンジ等でマイクロ波の照射を受けることで発熱する材料（例えば、フェライト等のセラミック粉末、小豆等）を用いてもよい。 As the heat generating material 4, a material other than a material that generates heat due to contact with air may be used. As the heat generating material 4, for example, a material that generates heat when irradiated with microwaves in a microwave oven or the like (for example, ceramic powder such as ferrite, red beans, etc.) may be used.
　（１．２．２）袋体
　袋体２は、発熱材料４を収める収納空間を内部に有する。本実施形態に係る袋体２は、図３（Ａ）に示すように、扁平に形成されており、表側シート部２１と、裏側シート部２２と、を備える。袋体２は、表側シート部２１と裏側シート部２２とが接合部３によって接合されることで、内部に収納空間が形成される。 (1.2.2) Bag body The bag body 2 has a storage space inside for storing the heat generating material 4. As shown in FIG. 3A, the bag body 2 according to the present embodiment is formed flat and includes a front side sheet portion 21 and a back side sheet portion 22. In the bag body 2, a storage space is formed inside the front side sheet portion 21 and the back side sheet portion 22 by being joined by the joint portion 3.
　本実施形態に係る袋体２は、図２に示すように、幅及び長さを有する正面視略Ｄ字状に形成されているが、例えば、正面視略長方形状、正面視正方形状、正面視三角形状、五角形以上の正面視多角形状、正面視真円形状、正面視楕円形状等に形成されてもよく、形状に制限はない。 As shown in FIG. 2, the bag body 2 according to the present embodiment is formed in a substantially D-shape in front view having a width and a length. For example, a substantially rectangular shape in front view, a square shape in front view, and a front view. It may be formed into a triangular shape, a polygonal shape in front view of a pentagon or more, a perfect circle shape in front view, an ellipse shape in front view, and the like, and the shape is not limited.
　（１．２．２．１）表側シート部
　表側シート部２１は、袋体２の一面を形成するシート状をなす部分である。本実施形態に係る表側シート部２１は、図３（Ａ）に示すように、一のシート材で構成されている。本実施形態に係る表側シート部２１は、可とう性を有する。これによって、足元用発熱体１は、ユーザの足裏に沿って変形することができる。 (1.2.2.1) Front-side sheet portion The front-side sheet portion 21 is a sheet-shaped portion that forms one surface of the bag body 2. As shown in FIG. 3A, the front side sheet portion 21 according to the present embodiment is made of one sheet material. The front side sheet portion 21 according to the present embodiment has flexibility. As a result, the foot heating element 1 can be deformed along the sole of the user's foot.
　本実施形態に係る表側シート部２１は、強度や発熱材料４の発熱に対する耐久性等の観点から、樹脂フィルムが用いられることが好ましい。樹脂フィルムに用いられる樹脂としては、熱可塑性樹脂が好ましい。熱可塑性樹脂としては、例えば、ポリエチレン、ポリプロピレン、ポリエステル、ポリアミド、ポリウレタン、ポリスチレン、ポリビニルアルコール、ポリ塩化ビニル、ポリ塩化ビニリデン、ポリカーボネート、エチレン－酢酸ビニル共重合体等が挙げられる。これらの樹脂は、単独で用いられてもよいし、２種以上を組み合わせて用いられてもよい。 It is preferable that a resin film is used for the front side sheet portion 21 according to the present embodiment from the viewpoint of strength, durability against heat generation of the heat generating material 4, and the like. As the resin used for the resin film, a thermoplastic resin is preferable. Examples of the thermoplastic resin include polyethylene, polypropylene, polyester, polyamide, polyurethane, polystyrene, polyvinyl alcohol, polyvinyl chloride, polyvinylidene chloride, polycarbonate, ethylene-vinyl acetate copolymer and the like. These resins may be used alone or in combination of two or more.
　また、足元用発熱体１の足５における肌触りを良好にする観点から、表側シート部２１は、樹脂フィルムの外側に織布又は不織布が設けられることが好ましい。 Further, from the viewpoint of improving the feel of the foot 5 of the foot heating element 1, it is preferable that the front side sheet portion 21 is provided with a woven cloth or a non-woven fabric on the outside of the resin film.
　織布又は不織布の繊維素材としては、例えば、コットン、麻、絹、紙等の天然繊維、レーヨン、アセテート等の半合成繊維、ナイロン、ビニロン、ポリエステル、アクリル、ポリエチレン、ポリプロピレン、ポリ塩化ビニル、ポリブチレンテレフタレート等の合成繊維、これら繊維の混合繊維等が挙げられる。繊維素材としては、この中でも、肌触りを良好とする観点から、ナイロン、ポリエステル、ポリプロピレンが好ましい。これらの繊維素材は単独で用いられてもよいし、２種以上を組み合わせて用いられてもよい。織布又は不織布の目付は、発熱材料４の袋体２の外側への漏出を防止できる程度であれば特に制限されないが、一例として、２０ｇ／ｍ２以上７０ｇ／ｍ２以下が例示される。 Examples of fiber materials for woven fabrics or non-woven fabrics include natural fibers such as cotton, linen, silk and paper, semi-synthetic fibers such as rayon and acetate, nylon, vinylon, polyester, acrylic, polyethylene, polypropylene, polyvinyl chloride and poly. Examples thereof include synthetic fibers such as butylene terephthalate and mixed fibers of these fibers. Among these, nylon, polyester, and polypropylene are preferable as the fiber material from the viewpoint of improving the feel on the skin. These fiber materials may be used alone or in combination of two or more. The basis weight of the woven fabric or the non-woven fabric is not particularly limited as long as it can prevent the heat-generating material 4 from leaking to the outside of the bag body 2, but as an example, 20 g / m 2 or more and 70 g / m 2 or less is exemplified.
　ただし、表側シート部２１としては、樹脂フィルムと、織布又は不織布との積層体でなくてもよく、単独の樹脂フィルムで構成されてもよいし、単独の織布又は不織布で構成されてもよい。 However, the front side sheet portion 21 does not have to be a laminate of a resin film and a woven fabric or a non-woven fabric, and may be composed of a single resin film or a single woven fabric or non-woven fabric. Good.
　本実施形態に係る表側シート部２１は、通気性を有する。本実施形態に係る表側シート部２１では、樹脂フィルムが、多孔質の樹脂フィルム、又は複数の孔（不図示）が形成された樹脂フィルムであることで、表側シート部２１は複数の孔を有する。このため、表側シート部２１は、複数の孔を通して、袋体２の内外を通気することができる。複数の孔は、表側シート部２１の全面にわたって均等に形成されていてもよいし、一部に密集して形成されてもよい。また、各孔の径は、発熱材料４が孔を通して漏出するのを抑制し得る大きさであればよく、一例として、０．１μｍ以上３０μｍ以下が例示される。また、孔の形状及び数量も特に制限されない。足元用発熱体１の体感温度は袋体２の通気量に応じて変化するため、孔の大きさ、形状及び数量は、足元用発熱体１の体感温度と、発熱材料４の漏出の抑制の程度とを考慮して、適宜設定される。 The front side sheet portion 21 according to this embodiment has breathability. In the front side sheet portion 21 according to the present embodiment, the front side sheet portion 21 has a plurality of holes because the resin film is a porous resin film or a resin film having a plurality of holes (not shown) formed therein. .. Therefore, the front side sheet portion 21 can ventilate the inside and outside of the bag body 2 through the plurality of holes. The plurality of holes may be formed evenly over the entire surface of the front side sheet portion 21, or may be formed densely in a part thereof. Further, the diameter of each hole may be a size that can suppress the heat generating material 4 from leaking through the hole, and as an example, 0.1 μm or more and 30 μm or less is exemplified. Further, the shape and quantity of the holes are not particularly limited. Since the sensible temperature of the foot heating element 1 changes according to the air volume of the bag body 2, the size, shape and quantity of the holes are the sensible temperature of the foot heating element 1 and the suppression of leakage of the heating material 4. It is set appropriately in consideration of the degree.
　なお、表側シート部２１として、不織布が単独で用いられる場合には、複数の孔は形成されなくてもよい。 When the non-woven fabric is used alone as the front side sheet portion 21, a plurality of holes may not be formed.
　表側シート部２１は、一定の透湿度を有することが好ましい。表側シート部２１の透湿度は、３００g/（m２・day）以上１０００g/（m２・day）以下であることが好ましく、４００g/（m２・day）以上９００g/（m２・day）以下であることがより好ましい。ただし、表側シート部２１の透湿度は、特に制限されない。 The front sheet portion 21 preferably has a constant moisture permeability. Moisture permeability of the front seat 21 is preferably at 300g / (m 2 · day) or more 1000g / (m 2 · day) or less, 400g / (m 2 · day ) or more 900g / (m 2 · day) The following is more preferable. However, the moisture permeability of the front sheet portion 21 is not particularly limited.
　（１．２．２．２）裏側シート部
　裏側シート部２２は、袋体２において、表側シート部２１とは反対側の面を形成するシート状をなす部分である。本実施形態に係る裏側シート部２２は、一のシート材で構成されている。本実施形態に係る裏側シート部２２は、表側シート部２１と同様、可とう性を有する。 (1.2.2.2) Back side sheet portion The back side sheet portion 22 is a sheet-shaped portion of the bag body 2 that forms a surface opposite to the front side sheet portion 21. The back side sheet portion 22 according to the present embodiment is made of one sheet material. The back side sheet portion 22 according to the present embodiment has flexibility like the front side sheet portion 21.
　裏側シート部２２は、表側シート部２１と同様、樹脂フィルムが用いられることが好ましい。ただし、裏側シート部２２は、表側シート部２１と同じ構造及び同じ素材である必要はない。裏側シート部２２としては、表側シート部２１と同様に、樹脂フィルムと、織布又は不織布との積層体で構成されることが好ましいが、これに制限されず、単独の樹脂フィルムで構成されてもよいし、単独の織布又は不織布で構成されてもよい。 It is preferable that a resin film is used for the back side sheet portion 22 as in the front side sheet portion 21. However, the back side sheet portion 22 does not have to have the same structure and the same material as the front side sheet portion 21. The back side sheet portion 22 is preferably composed of a laminate of a resin film and a woven fabric or a non-woven fabric as in the front side sheet portion 21, but is not limited to this and is composed of a single resin film. It may be composed of a single woven fabric or a non-woven fabric.
　本実施形態に係る裏側シート部２２は、通気性を有する。本実施形態に係る裏側シート部２２は、表側シート部２１と同様、樹脂フィルムが、多孔質の樹脂フィルム、又は複数の孔（不図示）が形成された樹脂フィルムであることで、裏側シート部２２は複数の孔を有する。ただし、裏側シート部２２は必ずしも通気性を有している必要はなく、非通気性であってもよい。 The back side sheet portion 22 according to this embodiment has breathability. Similar to the front side sheet portion 21, the back side sheet portion 22 according to the present embodiment is a back side sheet portion because the resin film is a porous resin film or a resin film having a plurality of holes (not shown) formed therein. 22 has a plurality of holes. However, the back side sheet portion 22 does not necessarily have to be breathable, and may be non-breathable.
　表側シート部２１及び裏側シート部２２の各々の厚さは、特に制限されないが、例えば、０．１ｍｍ以上２．０ｍｍ以下であることが好ましい。これによって、足元用発熱体１を、柔らかくかつ足裏５になじみやすくできる一方で、足裏５によって踏まれ続けても耐えられる程度の一定の強度を確保することができる。 The thickness of each of the front side sheet portion 21 and the back side sheet portion 22 is not particularly limited, but is preferably 0.1 mm or more and 2.0 mm or less, for example. As a result, the foot heating element 1 can be made soft and easily adapted to the sole 5, while it is possible to secure a certain strength that can withstand being continuously stepped on by the sole 5.
　裏側シート部２２は、表側シート部２１と同様、一定の透湿度を有することが好ましい。裏側シート部２２の透湿度は、表側シート部２１と同様、３００g/（m２・day）以上１０００g/（m２・day）以下であることが好ましく、４００g/（m２・day）以上９００g/（m２・day）以下であることがより好ましい。ただし、裏側シート部２２の透湿度は、特に制限されない。 Like the front sheet portion 21, the back sheet portion 22 preferably has a constant moisture permeability. The moisture permeability of the back side sheet portion 22 is preferably 300 g / (m 2 · day) or more and 1000 g / (m 2 · day) or less, and 400 g / (m 2 · day) or more and 900 g, like the front side sheet part 21. It is more preferably less than / (m 2 · day). However, the moisture permeability of the back sheet portion 22 is not particularly limited.
　本実施形態に係る足元用発熱体１は、滑り止め部７を備える。滑り止め部７は、足元用発熱体１が、ユーザの足裏５と靴６の内底６１との間で位置ずれするのを抑える。本実施形態に係る滑り止め部７は、裏側シート部２２に形成された複数の小突起７１によって構成される。複数の小突起７１は、本実施形態では、裏側シート部２２の一面（外面）の全面にわたって均等に形成されているが、本開示では、少なくとも一部の領域に形成されていてもよい。 The foot heating element 1 according to this embodiment includes a non-slip portion 7. The non-slip portion 7 prevents the foot heating element 1 from being displaced between the sole 5 of the user and the inner sole 61 of the shoe 6. The non-slip portion 7 according to the present embodiment is composed of a plurality of small protrusions 71 formed on the back side sheet portion 22. In the present embodiment, the plurality of small protrusions 71 are uniformly formed over the entire surface (outer surface) of the back side sheet portion 22, but in the present disclosure, they may be formed in at least a part of the region.
　小突起７１は、例えば、ゴムやアクリル樹脂によって構成される。ただし、滑り止め部７としては、滑り止めの機能を有する発泡インクを裏側シート部２２に印刷することで実施されてもよい。また、滑り止め部７は、裏側シート部２２ではなく、表側シート部２１に形成されてもよいし、裏側シート部２２と表側シート部２１との両方に形成されてもよい。 The small protrusion 71 is made of, for example, rubber or acrylic resin. However, the non-slip portion 7 may be implemented by printing foam ink having a non-slip function on the back side sheet portion 22. Further, the anti-slip portion 7 may be formed not on the back side seat portion 22 but on the front side seat portion 21, or may be formed on both the back side seat portion 22 and the front side seat portion 21.
　また、本開示に係る足元用発熱体１では、滑り止め部７に代えて、粘着層を設けてもよい。粘着層は、裏側シート部２２又は表側シート部２１のいずれか一方に設けられる。これによって、足元用発熱体１をユーザの足裏５に貼り付けて使用してもよいし、靴６の内底６１に貼り付けて使用してもよい。 Further, in the foot heating element 1 according to the present disclosure, an adhesive layer may be provided instead of the non-slip portion 7. The adhesive layer is provided on either the back side sheet portion 22 or the front side sheet portion 21. As a result, the foot heating element 1 may be attached to the sole 5 of the user's foot for use, or may be attached to the inner sole 61 of the shoe 6 for use.
　（１．２．２．３）接合部
　接合部３は、表側シート部２１と裏側シート部２２とが接合された部分である。本実施形態に係る接合部３は、表側シート部２１の一部と、裏側シート部２２の一部とが溶着（ヒートシール）されて構成されている。ただし、接合部３は、溶着でなくてもよく、例えば、接着、縫合、圧着等で実現されてもよいし、これらの組み合わせで実現されてもよい。接合部３は、図２に示すように、縁部３１と、複数（ここでは二つ）の突出部３２と、を備える。 (1.2.2.3) Joint portion The joint portion 3 is a portion where the front side sheet portion 21 and the back side sheet portion 22 are joined. The joint portion 3 according to the present embodiment is configured by welding (heat sealing) a part of the front side sheet portion 21 and a part of the back side sheet portion 22. However, the joint portion 3 does not have to be welded, and may be realized by, for example, bonding, suturing, crimping, or the like, or may be realized by a combination thereof. As shown in FIG. 2, the joint portion 3 includes an edge portion 31 and a plurality of (here, two) projecting portions 32.
　縁部３１は、接合部３のうち、袋体２の外周に沿って形成された部分である。本実施形態に係る縁部３１は、袋体２の外周の全長にわたって連続している。縁部３１の幅寸法は、特に制限されないが、例えば、１ｍｍ以上１０ｍｍ以下であることが好ましく、より好ましくは、３ｍｍ以上７ｍｍ以下である。本実施形態に係る縁部３１は、全長にわたって略同じ幅寸法に形成されている。 The edge portion 31 is a portion of the joint portion 3 formed along the outer circumference of the bag body 2. The edge portion 31 according to the present embodiment is continuous over the entire outer circumference of the bag body 2. The width dimension of the edge portion 31 is not particularly limited, but is preferably 1 mm or more and 10 mm or less, and more preferably 3 mm or more and 7 mm or less. The edge portion 31 according to the present embodiment is formed to have substantially the same width dimension over the entire length.
　本実施形態に係る縁部３１は、長さ方向に沿って形成された一対の第一直線部３１５と、幅方向に沿って形成された第二直線部３１６と、一対の第一直線部３１５をつなぐ円弧状部３１７と、を備える。一対の第一直線部３１５は、本実施形態では略直線状に形成されており、互いに平行である。 The edge portion 31 according to the present embodiment connects a pair of first straight line portions 315 formed along the length direction, a second straight line portion 316 formed along the width direction, and a pair of first straight line portions 315. An arcuate portion 317 is provided. In the present embodiment, the pair of first straight line portions 315 are formed in a substantially straight line shape and are parallel to each other.
　突出部３２は、接合部３のうち、縁部３１から発熱材料４側に突き出た部分である。本実施形態に係る足元用発熱体１では、各第一直線部３１５から突出部３２が突き出ることで、発熱面の最高温度を下げ、局所的な高い温度上昇を抑えることができる。また、突出部３２によれば、袋体２の内部のうち長さ方向において、発熱材料４が移動しにくく、長さ方向において発熱材料４が片寄りにくくなる。 The protruding portion 32 is a portion of the joint portion 3 protruding from the edge portion 31 toward the heat generating material 4. In the foot heating element 1 according to the present embodiment, the protruding portion 32 protrudes from each first straight portion 315, so that the maximum temperature of the heating surface can be lowered and a locally high temperature rise can be suppressed. Further, according to the protruding portion 32, the heat generating material 4 is less likely to move in the length direction inside the bag body 2, and the heat generating material 4 is less likely to be biased in the length direction.
　本実施形態に係る突出部３２は、袋体２の幅方向に沿って延びている。突出部３２の幅寸法Ｈ１は、本実施形態では、縁部３１の幅寸法と略同じである。 The protruding portion 32 according to the present embodiment extends along the width direction of the bag body 2. In the present embodiment, the width dimension H1 of the protruding portion 32 is substantially the same as the width dimension of the edge portion 31.
　突出部３２の突き出る寸法（以下、突出寸法Ｌ１）としては、発熱面の最高温度を下げ、局所的な高い温度上昇を抑える観点から、以下のように設定することが好ましい。すなわち、突出部３２の突出寸法Ｌ１は、突出部３２が突き出る方向において、突出部３２に対応する位置での袋体２の内寸Ｄ２に対し、好ましくは５％以上、より好ましくは１０％以上４０％以下、更に好ましくは１５％以上３５％以下に設定される。 The protruding dimension of the protruding portion 32 (hereinafter, protruding dimension L1) is preferably set as follows from the viewpoint of lowering the maximum temperature of the heat generating surface and suppressing a locally high temperature rise. That is, the protrusion dimension L1 of the protrusion 32 is preferably 5% or more, more preferably 10% or more, with respect to the inner dimension D2 of the bag body 2 at the position corresponding to the protrusion 32 in the direction in which the protrusion 32 protrudes. It is set to 40% or less, more preferably 15% or more and 35% or less.
　ここで、本開示でいう「突出部３２が突き出る方向における突出部３２に対応する位置での袋体２の内寸Ｄ２」とは、突出部３２が形成されている箇所において、突出部３２がないと仮定した場合の、縁部３１の位置から、これに対向する縁部３１の位置までの寸法を意味する。なお、ここでいう「突出部３２の突出寸法Ｌ１」とは、一つの突出部３２の突出寸法Ｌ１を意味する。したがって、複数の突出部３２が一直線Ｔ１上に位置する場合には、「突出部３２の突出寸法Ｌ１」は、複数の突出部３２のうちの一つの突出部３２の突出寸法のことを意味している。 Here, the "inner dimension D2 of the bag body 2 at the position corresponding to the protruding portion 32 in the direction in which the protruding portion 32 protrudes" as used in the present disclosure means that the protruding portion 32 is formed at a position where the protruding portion 32 is formed. It means the dimension from the position of the edge portion 31 to the position of the edge portion 31 facing the edge portion 31 when it is not assumed. The "protruding dimension L1 of the protruding portion 32" here means the protruding dimension L1 of one protruding portion 32. Therefore, when the plurality of projecting portions 32 are located on the straight line T1, the "protruding dimension L1 of the projecting portion 32" means the projecting dimension of one of the plurality of projecting portions 32. ing.
　一方、足元用発熱体１の温熱効果を確保するという観点から、突出部３２が突き出る方向において、突出部３２と当該突出部３２に対向する部分との間の寸法Ｄ１が、次の条件となるように、突出部３２の突出寸法Ｌ１が設定される。すなわち、寸法Ｄ１は、内寸Ｄ２に対し、好ましくは２０％以上９５％以下、より好ましくは２５％以上８５％以下、更に好ましくは３０％以上７０％以下となるように設定される。 On the other hand, from the viewpoint of ensuring the thermal effect of the foot heating element 1, the dimension D1 between the protruding portion 32 and the portion facing the protruding portion 32 in the direction in which the protruding portion 32 protrudes is the following condition. As described above, the protrusion dimension L1 of the protrusion 32 is set. That is, the dimension D1 is set to be preferably 20% or more and 95% or less, more preferably 25% or more and 85% or less, and further preferably 30% or more and 70% or less with respect to the inner dimension D2.
　ここで、「内寸Ｄ２」及び「突出寸法Ｌ１」の基点は、縁部３１の内周縁（実際には収納空間を形成する内周縁の延長線）上における、突出部３２の幅方向の中心点である。「収納空間を形成する内周縁の延長線」は、突出部３２と縁部３１が一体であるため実際には現れないが、突出部３２の両側にある縁部３１の内周縁を滑らかにつないだ仮想線のことである。 Here, the base points of the "inner dimension D2" and the "protruding dimension L1" are the centers in the width direction of the protruding portion 32 on the inner peripheral edge of the edge portion 31 (actually, an extension line of the inner peripheral edge forming the storage space). It is a point. The "extension line of the inner peripheral edge forming the storage space" does not actually appear because the protruding portion 32 and the edge portion 31 are integrated, but the inner peripheral edges of the edge portions 31 on both sides of the protruding portion 32 are smoothly connected. It's a virtual line.
　また、「突出寸法Ｌ１」は、突出部３２が形成された縁部３１の内周縁と平行でかつ突出部３２との交点を持つ線と、当該内周縁との間の距離の最大値である。また、「突出部３２が突き出る方向」とは、当該突出部３２が形成された縁部３１の内周縁が直線状である場合、当該内周縁に直交する方向であり、当該突出部３２が形成された縁部３１の内周縁が曲線状である場合、縁部３１の内周縁上における突出部３２の幅方向の中心点における、当該内周縁の接線に直交する方向である。本実施形態では突出部３２が形成された縁部３１の内周縁が直線状であるため、「突出部３２が突き出る方向」は、足元用発熱体１の幅方向と平行となる。 Further, the "protruding dimension L1" is the maximum value of the distance between the line parallel to the inner peripheral edge of the edge portion 31 on which the protruding portion 32 is formed and having an intersection with the protruding portion 32 and the inner peripheral edge. .. Further, the "direction in which the protruding portion 32 protrudes" is a direction orthogonal to the inner peripheral edge when the inner peripheral edge of the edge portion 31 on which the protruding portion 32 is formed is linear, and the protruding portion 32 is formed. When the inner peripheral edge of the edge portion 31 is curved, it is a direction orthogonal to the tangent line of the inner peripheral edge at the center point in the width direction of the protruding portion 32 on the inner peripheral edge of the edge portion 31. In the present embodiment, since the inner peripheral edge of the edge portion 31 on which the protruding portion 32 is formed is linear, the "direction in which the protruding portion 32 protrudes" is parallel to the width direction of the foot heating element 1.
　また、本実施形態では、一対の突出部３２が一直線Ｔ１上に位置する。寸法Ｄ１は、内寸Ｄ２から突出部３２の突出寸法Ｌ１の合計（すなわちＬ１＋Ｌ１）を差し引いた寸法となる。この場合、Ｄ１＝Ｄ２－（Ｌ１＋Ｌ１）となる。 Further, in the present embodiment, the pair of protrusions 32 are located on the straight line T1. The dimension D1 is the inner dimension D2 minus the sum of the protruding dimensions L1 of the protruding portion 32 (that is, L1 + L1). In this case, D1 = D2- (L1 + L1).
　これに対し、例えば、図７（変形例２）又は図８（変形例３－１）に示すように、突出部３２が一直線Ｔ１上に一つのみの場合、寸法Ｄ１は、内寸Ｄ２から突出部３２の突出寸法Ｌ１を差し引いた寸法となる。この場合、Ｄ１＝Ｄ２－Ｌ１となる。なお、突出部３２が突き出る方向において、突出部３２と当該突出部３２に対向する部分との間に複数の線分が引ける場合、ここでいう「寸法Ｄ１」は、複数の線分のうちの最短の線分の寸法とする。 On the other hand, for example, as shown in FIG. 7 (Modification 2) or FIG. 8 (Modification 3-1), when there is only one protrusion 32 on the straight line T1, the dimension D1 starts from the inner dimension D2. The dimension is obtained by subtracting the protrusion dimension L1 of the protrusion 32. In this case, D1 = D2-L1. When a plurality of line segments can be drawn between the protruding portion 32 and the portion facing the protruding portion 32 in the direction in which the protruding portion 32 protrudes, the "dimension D1" here is one of the plurality of line segments. Use the shortest line segment size.
　ただし、突出部３２の突出寸法Ｌ１及び幅寸法Ｈ１は、特に制限がない。また、突出部３２の突き出る方向は、袋体２の幅方向に沿っていなくてもよく、例えば、幅方向に対して傾斜していてもよい。 However, the protrusion dimension L1 and the width dimension H1 of the protrusion 32 are not particularly limited. Further, the protruding direction of the protruding portion 32 does not have to be along the width direction of the bag body 2, and may be inclined with respect to the width direction, for example.
　本実施形態に係る突出部３２は、一の第一直線部３１５と、円弧状部３１７との境界部分に形成されている。ただし、突出部３２は、第一直線部３１５、円弧状部３１７又は第二直線部３１６のいずれに設けられてもよい。 The protruding portion 32 according to the present embodiment is formed at the boundary portion between the first straight portion 315 and the arcuate portion 317. However, the protruding portion 32 may be provided on any of the first straight line portion 315, the arcuate portion 317, and the second straight line portion 316.
　一対の突出部３２は、本実施形態では、一直線Ｔ１上に位置している。すなわち、複数の突出部３２の突き出る方向は、一直線Ｔ１に沿っている。本実施形態に係る足元用発熱体１では、突出部３２が位置する部分に発熱材料４が存在しないため、突出部３２の位置で、一直線Ｔ１に沿って曲がりやすい。 The pair of protrusions 32 are located on a straight line T1 in this embodiment. That is, the protruding directions of the plurality of projecting portions 32 are along the straight line T1. In the foot heating element 1 according to the present embodiment, since the heat generating material 4 does not exist in the portion where the protruding portion 32 is located, it is easy to bend along the straight line T1 at the position of the protruding portion 32.
　接合部３には、図２に示すように、袋体２の外縁から凹む複数（ここでは二つ）の凹み３３が形成されている。本実施形態に係る凹み３３は、突出部３２に対応する箇所に形成された切欠きである。凹み３３は、シート材の成形時に形成されていてもよいし、袋体２を形成した後に、切り欠いてもよい。凹み３３の周縁は、本実施形態では、円弧状に形成されているが、鋭角又は鈍角状に形成されてもよく、特に制限はない。本実施形態に係る足元用発熱体１では、突出部３２に対応する箇所に凹み３３が形成されることで、接合部３の接合強度を保ちながらも、突出部３２に対応する箇所で曲がりやすくなる。 As shown in FIG. 2, the joint portion 3 is formed with a plurality of (here, two) dents 33 that are recessed from the outer edge of the bag body 2. The recess 33 according to the present embodiment is a notch formed at a portion corresponding to the protruding portion 32. The recess 33 may be formed at the time of molding the sheet material, or may be cut out after the bag body 2 is formed. In the present embodiment, the peripheral edge of the recess 33 is formed in an arc shape, but may be formed in an acute angle or an obtuse angle, and is not particularly limited. In the foot heating element 1 according to the present embodiment, since the recess 33 is formed at the portion corresponding to the protruding portion 32, the joint strength of the joint portion 3 is maintained, and the portion corresponding to the protruding portion 32 is easily bent. Become.
　（２）作用効果
　以上説明したように、本実施に係る足元用発熱体１は、袋体２の外周の少なくとも一部に沿って形成された縁部３１から発熱材料４側に突出部３２が突き出る。これによれば、発熱体１において、発熱面の最高温度を下げ、局所的な高い温度上昇を抑えることができる。ここで、突出部３２を袋体２の長さ方向の中央部に形成することで、最高温度が下がり、かつ高温域が増加するので、温度分布の均一化を図ることができ、足元を広範囲に温めることができる。一方で、突出部３２を袋体２の長さ方向の一方の端部側に偏った位置に形成することで、最高温度が下がりかつ高温域が袋体３の長さ方向の中央部から移動するので、例えば足先（指先）を狙って温めることができる。 (2) Action and Effect As described above, in the foot heating element 1 according to the present embodiment, the protruding portion 32 is provided on the heating material 4 side from the edge portion 31 formed along at least a part of the outer circumference of the bag body 2. Stick out. According to this, in the heating element 1, the maximum temperature of the heat generating surface can be lowered, and a locally high temperature rise can be suppressed. Here, by forming the protruding portion 32 in the central portion in the length direction of the bag body 2, the maximum temperature is lowered and the high temperature region is increased, so that the temperature distribution can be made uniform and the feet can be spread over a wide range. Can be warmed up. On the other hand, by forming the protruding portion 32 at a position biased toward one end side in the length direction of the bag body 2, the maximum temperature is lowered and the high temperature region moves from the central portion in the length direction of the bag body 3. Therefore, for example, it is possible to aim and warm the toes (fingertips).
　また、袋体２に封入された発熱材料４は、突出部３２によって移動が妨げられる。このため、本実施形態に係る足元用発熱体１では、足５で踏まれても、袋体２の内部において、発熱材料４が片寄りにくい。また、本実施形態に係る足元用発熱体１は、突出部３２に沿った部分で曲がりやすく、足５に沿ってフィットしやすい。 Further, the heat generating material 4 enclosed in the bag body 2 is hindered from moving by the protruding portion 32. Therefore, in the foot heating element 1 according to the present embodiment, even if the foot 5 is stepped on, the heating material 4 is unlikely to be biased inside the bag body 2. Further, the foot heating element 1 according to the present embodiment is easy to bend at a portion along the protruding portion 32 and is easy to fit along the foot 5.
　また、本実施形態に係る足元用発熱体１では、突出部３２の突出寸法Ｌ１は、突出部３２が突き出る方向における突出部３２に対応する位置での袋体２の内寸Ｄ２に対して、１５％以上３５％以下である。このため、より効果的に、発熱体１において、発熱面の最高温度を下げ、局所的な高い温度上昇を抑えることができる上に、袋体２の内部において、発熱材料４が片寄るのを抑えることができる。 Further, in the foot heating element 1 according to the present embodiment, the protruding dimension L1 of the protruding portion 32 is relative to the inner dimension D2 of the bag body 2 at the position corresponding to the protruding portion 32 in the direction in which the protruding portion 32 protrudes. It is 15% or more and 35% or less. Therefore, more effectively, in the heating element 1, the maximum temperature of the heating surface can be lowered, a locally high temperature rise can be suppressed, and the heat generating material 4 can be suppressed from being biased inside the bag body 2. be able to.
　また、本実施形態に係る足元用発熱体１では、突出部３２が突き出る方向において、突出部３２と、当該突出部３２に対向する部分との間の寸法Ｄ１は、突出部３２に対応する位置での袋体２の内寸Ｄ２に対して、３０％以上７０％以下である。このため、この態様によれば、足元用発熱体１において、一定の温熱効果を確保することができる。 Further, in the foot heating element 1 according to the present embodiment, the dimension D1 between the protruding portion 32 and the portion facing the protruding portion 32 is a position corresponding to the protruding portion 32 in the direction in which the protruding portion 32 protrudes. It is 30% or more and 70% or less with respect to the inner size D2 of the bag body 2 in the above. Therefore, according to this aspect, it is possible to secure a certain thermal effect in the foot heating element 1.
　また、本実施形態に係る足元用発熱体１は、突出部３２を複数含み、複数の突出部３２の突き出る方向は、一直線Ｔ１に沿っている。このため、足元用発熱体１が一直線Ｔ１に沿って曲がりやすくなり、より一層、足元用発熱体１を足５に沿って変形させやすくなる。 Further, the foot heating element 1 according to the present embodiment includes a plurality of protruding portions 32, and the protruding directions of the plurality of protruding portions 32 are along a straight line T1. Therefore, the foot heating element 1 is likely to bend along the straight line T1, and the foot heating element 1 is more easily deformed along the foot 5.
　また、本実施形態に係る足元用発熱体１では、袋体２の外縁において、突出部３２に対応する箇所に凹みが形成されている。このため、足元用発熱体１が一直線Ｔ１に沿って、より曲がりやすくなり、より一層、足元用発熱体１を足５に沿って変形させやすくなる。 Further, in the foot heating element 1 according to the present embodiment, a dent is formed at a portion corresponding to the protruding portion 32 on the outer edge of the bag body 2. Therefore, the foot heating element 1 is more likely to bend along the straight line T1, and the foot heating element 1 is more easily deformed along the foot 5.
　（３）変形例
　上記実施形態は、本開示の様々な実施形態の一つに過ぎない。実施形態は、本開示の目的を達成できれば、設計等に応じて種々の変更が可能である。以下、実施形態の変形例を説明する。以下に説明する変形例は、適宜組み合わせて適用可能である。 (3) Modified Example The above embodiment is only one of various embodiments of the present disclosure. The embodiment can be changed in various ways depending on the design and the like as long as the object of the present disclosure can be achieved. Hereinafter, a modified example of the embodiment will be described. The modifications described below can be applied in combination as appropriate.
　（３．１）袋体の外形についての変形例（変形例１）
　（３．１．１）変形例１－１
　上記実施形態に係る足元用発熱体１は、正面視略Ｄ字状に形成されていたが、図４に示すように、靴６の内底６１に沿った形状に形成されていてもよい。 (3.1) Deformation example of the outer shape of the bag body (deformation example 1)
(3.1.1) Modification 1-1
The foot heating element 1 according to the above embodiment is formed in a substantially D-shape in front view, but may be formed in a shape along the inner sole 61 of the shoe 6 as shown in FIG.
　変形例１－１に係る足元用発熱体１は、２対の突出部３２を有する。一対の突出部３２は一直線Ｔ１上に位置している。２セットの一対の突出部３２同士は、足元用発熱体１の長さ方向に離れている。 The foot heating element 1 according to the modified example 1-1 has two pairs of protrusions 32. The pair of protrusions 32 are located on a straight line T1. The pair of protruding portions 32 of the two sets are separated from each other in the length direction of the foot heating element 1.
　突出部３２の突出寸法Ｌ１は、内寸Ｄ２に対し、好ましくは５％以上、より好ましくは１０％以上４０％以下、更に好ましくは１５％以上３５％以下に設定される。また、寸法Ｄ１が内寸Ｄ２に対して好ましくは２０％以上９５％以下、より好ましくは２５％以上８５％以下、更に好ましくは３０％以上７０％以下となるように、突出部３２の突出寸法Ｌ１が設定される。 The protrusion dimension L1 of the protrusion 32 is preferably set to 5% or more, more preferably 10% or more and 40% or less, and further preferably 15% or more and 35% or less with respect to the inner size D2. Further, the protruding dimension of the protruding portion 32 is such that the dimension D1 is preferably 20% or more and 95% or less, more preferably 25% or more and 85% or less, and further preferably 30% or more and 70% or less with respect to the inner dimension D2. L1 is set.
　ここで、「内寸Ｄ２」及び「突出寸法Ｌ１」の基点は、縁部３１の内周縁（実際には収納空間を形成する内周縁の延長線）上における、突出部３２の幅方向の中心点である。「収納空間を形成する内周縁の延長線」は、突出部３２と縁部３１が一体であるため実際には現れないが、突出部３２の両側にある縁部３１の内周縁を滑らかにつないだ仮想線のことである。 Here, the base points of the "inner dimension D2" and the "protruding dimension L1" are the centers in the width direction of the protruding portion 32 on the inner peripheral edge of the edge portion 31 (actually, an extension line of the inner peripheral edge forming the storage space). It is a point. The "extension line of the inner peripheral edge forming the storage space" does not actually appear because the protruding portion 32 and the edge portion 31 are integrated, but the inner peripheral edges of the edge portions 31 on both sides of the protruding portion 32 are smoothly connected. It's a virtual line.
　変形例１－１に係る足元用発熱体１においても、上記実施形態と同様の効果を奏することができる。 The foot heating element 1 according to the modified example 1-1 can also have the same effect as that of the above embodiment.
　（３．１．２）変形例１－２
　上記実施形態に係る足元用発熱体１は、正面視略Ｄ字状に形成されていたが、図５に示すように、正面視長方形状に形成されていてもよい。
　変形例１－２に係る足元用発熱体１では、縁部３１は、長さ方向に沿って形成された一対の長辺部３１１と、幅方向に沿って形成された一対の短辺部３１２と、四つの角部３１３と、を備える。一対の長辺部３１１は、略直線状に形成されており、互いに平行である。一対の短辺部３１２は、長さ方向の外側に向かって膨出するように湾曲しているが、直線状に形成されてもよい。各角部３１３は、一の長辺部３１１の端と、一の短辺部３１２の端とをつなぐ。角部３１３は、隅丸状に形成されているが、例えば、Ｃ面取り状、鈍角状、鋭角状等に形成されてもよい。 (3.1.2) Modification 1-2
The foot heating element 1 according to the above embodiment is formed in a substantially D-shape in front view, but may be formed in a rectangular shape in front view as shown in FIG.
In the foot heating element 1 according to the modified example 1-2, the edge portion 31 has a pair of long side portions 311 formed along the length direction and a pair of short side portions 312 formed along the width direction. And four corner portions 313. The pair of long side portions 311 are formed in a substantially linear shape and are parallel to each other. The pair of short side portions 312 are curved so as to bulge outward in the length direction, but may be formed in a straight line. Each corner portion 313 connects the end of one long side portion 311 and the end of one short side portion 312. The corner portion 313 is formed in a rounded corner shape, but may be formed in a C chamfered shape, an obtuse angle shape, an acute angle shape, or the like, for example.
　各突出部３２は、各長辺部３１１から発熱材料４側に突き出ており、一直線Ｔ１上に位置している。突出部３２の突出寸法Ｌ１は、内寸Ｄ２に対し、好ましくは５％以上、より好ましくは１０％以上４０％以下、更に好ましくは１５％以上３５％以下に設定される。また、寸法Ｄ１が内寸Ｄ２に対して好ましくは２０％以上９５％以下、より好ましくは２５％以上８５％以下、更に好ましくは３０％以上７０％以下となるように、突出部３２の突出寸法Ｌ１が設定される。 Each protruding portion 32 protrudes from each long side portion 311 toward the heat generating material 4 side, and is located on a straight line T1. The protrusion dimension L1 of the protrusion 32 is preferably set to 5% or more, more preferably 10% or more and 40% or less, and further preferably 15% or more and 35% or less with respect to the inner size D2. Further, the protruding dimension of the protruding portion 32 is such that the dimension D1 is preferably 20% or more and 95% or less, more preferably 25% or more and 85% or less, and further preferably 30% or more and 70% or less with respect to the inner dimension D2. L1 is set.
　変形例１－２に係る足元用発熱体１においても、上記実施形態と同様の効果を奏することができる。 The foot heating element 1 according to the modified example 1-2 can also have the same effect as that of the above embodiment.
　（３．１．３）変形例１－３
　上記実施形態に係る足元用発熱体１は、正面視略Ｄ字状に形成されていたが、図６に示すように、正面視長円形に形成されていてもよい。ここで、本開示でいう「長円形」とは、一方向に延びた円を意味し、例えば、卵形、楕円形、オーバル形、角丸長方形等を含む。 (3.1.3) Modification 1-3
The foot heating element 1 according to the above embodiment is formed in a substantially D-shape in front view, but may be formed in an oval shape in front view as shown in FIG. Here, the "oval" as used in the present disclosure means a circle extending in one direction, and includes, for example, an egg shape, an ellipse shape, an oval shape, a rounded rectangle, and the like.
　変形例１－３に係る足元用発熱体１では、縁部３１が曲線状に形成されている。突出部３２は、縁部３１から発熱材料４側に突き出ている。突出部３２の突出寸法Ｌ１は、内寸Ｄ２に対し、好ましくは５％以上、より好ましくは１０％以上４０％以下、更に好ましくは１５％以上３５％以下に設定される。また、寸法Ｄ１が内寸Ｄ２に対して好ましくは２０％以上９５％以下、より好ましくは２５％以上８５％以下、更に好ましくは３０％以上７０％以下となるように、突出部３２の突出寸法Ｌ１が設定される。 In the foot heating element 1 according to the modified example 1-3, the edge portion 31 is formed in a curved shape. The protruding portion 32 protrudes from the edge portion 31 toward the heat generating material 4. The protrusion dimension L1 of the protrusion 32 is preferably set to 5% or more, more preferably 10% or more and 40% or less, and further preferably 15% or more and 35% or less with respect to the inner size D2. Further, the protruding dimension of the protruding portion 32 is such that the dimension D1 is preferably 20% or more and 95% or less, more preferably 25% or more and 85% or less, and further preferably 30% or more and 70% or less with respect to the inner dimension D2. L1 is set.
　ここで、「内寸Ｄ２」及び「突出寸法Ｌ１」の基点は、縁部３１の内周縁（実際には収納空間を形成する内周縁の延長線）上における、突出部３２の幅方向の中心点である。「収納空間を形成する内周縁の延長線」は、突出部３２と縁部３１が一体であるため実際には現れないが、突出部３２の両側にある縁部３１の内周縁を滑らかにつないだ仮想線のことである。 Here, the base points of the "inner dimension D2" and the "protruding dimension L1" are the centers in the width direction of the protruding portion 32 on the inner peripheral edge of the edge portion 31 (actually, an extension line of the inner peripheral edge forming the storage space). It is a point. The "extension line of the inner peripheral edge forming the storage space" does not actually appear because the protruding portion 32 and the edge portion 31 are integrated, but the inner peripheral edges of the edge portions 31 on both sides of the protruding portion 32 are smoothly connected. It's a virtual line.
　変形例１－３に係る足元用発熱体１においても、上記実施形態と同様の効果を奏することができる。 The foot heating element 1 according to the modified example 1-3 can also have the same effect as that of the above embodiment.
　（３．２）突出部の数量についての変形例（変形例２）
　上記実施形態に係る足元用発熱体１は、突出部３２を二つ有していたが、図７に示すように、突出部３２を一つのみ有していてもよい。変形例２に係る足元用発熱体１では、一対の長辺部３１１のうちの一方のみの長辺部３１１から突出部３２が突き出ている。 (3.2) Modification example regarding the number of protrusions (modification example 2)
The foot heating element 1 according to the above embodiment has two protrusions 32, but as shown in FIG. 7, it may have only one protrusion 32. In the foot heating element 1 according to the second modification, the protruding portion 32 protrudes from the long side portion 311 of only one of the pair of long side portions 311.
　突出部３２の突出寸法Ｌ１は、内寸Ｄ２に対し、好ましくは５％以上、より好ましくは１０％以上４０％以下、更に好ましくは１５％以上３５％以下に設定される。また、寸法Ｄ１が内寸Ｄ２に対して好ましくは２０％以上９５％以下、より好ましくは２５％以上８５％以下、更に好ましくは３０％以上７０％以下となるように、突出部３２の突出寸法Ｌ１が設定される。 The protrusion dimension L1 of the protrusion 32 is preferably set to 5% or more, more preferably 10% or more and 40% or less, and further preferably 15% or more and 35% or less with respect to the inner size D2. Further, the protruding dimension of the protruding portion 32 is such that the dimension D1 is preferably 20% or more and 95% or less, more preferably 25% or more and 85% or less, and further preferably 30% or more and 70% or less with respect to the inner dimension D2. L1 is set.
　変形例２に係る足元用発熱体１においても、上記実施形態と同様の効果を奏することができる。 The foot heating element 1 according to the second modification can also have the same effect as that of the above embodiment.
　（３．３）突出部の配置についての変形例（変形例３）
　（３．３．１）変形例３－１
　上記実施形態に係る足元用発熱体１では、一直線Ｔ１上に二つの突出部３２が形成されていたが、図８に示すように、突出部３２の突き出る方向に見て、二つの突出部３２が互いにずれていてもよい。変形例３－１に係る足元用発熱体１では、一対の突出部３２は、足元用発熱体１の長さ方向に互いにずれて形成されている。 (3.3) Deformation example of arrangement of protrusions (deformation example 3)
(3.3.1) Modification 3-1
In the foot heating element 1 according to the above embodiment, the two protruding portions 32 are formed on the straight line T1, but as shown in FIG. 8, the two protruding portions 32 are viewed in the protruding direction of the protruding portions 32. May be offset from each other. In the foot heating element 1 according to the modified example 3-1 the pair of protruding portions 32 are formed so as to be offset from each other in the length direction of the foot heating element 1.
　突出部３２の突出寸法Ｌ１は、内寸Ｄ２に対し、好ましくは５％以上、より好ましくは１０％以上４０％以下、更に好ましくは１５％以上３５％以下に設定される。また、寸法Ｄ１が内寸Ｄ２に対して好ましくは２０％以上９５％以下、より好ましくは２５％以上８５％以下、更に好ましくは３０％以上７０％以下となるように、突出部３２の突出寸法Ｌ１が設定される。 The protrusion dimension L1 of the protrusion 32 is preferably set to 5% or more, more preferably 10% or more and 40% or less, and further preferably 15% or more and 35% or less with respect to the inner size D2. Further, the protruding dimension of the protruding portion 32 is such that the dimension D1 is preferably 20% or more and 95% or less, more preferably 25% or more and 85% or less, and further preferably 30% or more and 70% or less with respect to the inner dimension D2. L1 is set.
　変形例３－１に係る足元用発熱体１においても、上記実施形態と同様の効果を奏することができる。 The foot heating element 1 according to the modified example 3-1 can also have the same effect as that of the above embodiment.
　（３．３．２）変形例３－２
　上記実施形態に係る足元用発熱体１では、一対の長辺部３１１の各々に突出部３２が形成されていたが、特に図示はしないが、四つの角部３１３（図５参照）のうちの対角となる一対の角部３１３に突出部３２が形成されていてもよい。 (3.3.2) Modification 3-2
In the foot heating element 1 according to the above embodiment, the protruding portions 32 are formed on each of the pair of long side portions 311. However, although not particularly shown, of the four corner portions 313 (see FIG. 5). Protruding portions 32 may be formed on a pair of diagonal corner portions 313.
　変形例３－２に係る足元用発熱体１では、突出部３２は、縁部３１から、一直線としての対角線に沿って突き出している。一対の突出部３２は、対角線上に位置している。 In the foot heating element 1 according to the modified example 3-2, the protruding portion 32 protrudes from the edge portion 31 along a diagonal line as a straight line. The pair of protrusions 32 are located diagonally.
　変形例３－２に係る足元用発熱体１においても、上記実施形態と同様の効果を奏することができる。 The foot heating element 1 according to the modified example 3-2 can also exert the same effect as that of the above embodiment.
　なお、突出部３２は、縁部３１のうちの短辺部３１２から突き出ていてもよい。 The protruding portion 32 may protrude from the short side portion 312 of the edge portion 31.
　（３．４）袋体の構造についての変形例（変形例４）
　上記実施形態に係る足元用発熱体１では、袋体２は、形状が同じ二つのシート材を重ね合わせた上で、その外周接合して袋状に形成したが、図９に示すように、一のシート材を折り重ねた上で、その三辺を接合して袋状に形成してもよい。変形例４に係る足元用発熱体１では、袋体２の四辺のうちの三辺に沿って縁部３１が形成されている。 (3.4) Deformation example of the structure of the bag body (deformation example 4)
In the foot heating element 1 according to the above embodiment, the bag body 2 is formed by superimposing two sheet materials having the same shape and then joining the outer circumferences thereof to form a bag shape. As shown in FIG. One sheet material may be folded and then the three sides thereof may be joined to form a bag shape. In the foot heating element 1 according to the modified example 4, the edge portion 31 is formed along three of the four sides of the bag body 2.
　変形例４に係る足元用発熱体１では、袋体２の一面が表側シート部２１であり、反対側の面が裏側シート部２２である。表側シート部２１と裏側シート部２２とは、一体に形成されている。図９において符号３４で指す部分は折曲げ部である。強度を確保する観点から、折曲げ部３４を溶着してもよい。 In the foot heating element 1 according to the modified example 4, one surface of the bag body 2 is the front side sheet portion 21, and the opposite surface is the back side sheet portion 22. The front side sheet portion 21 and the back side sheet portion 22 are integrally formed. The portion pointed to by reference numeral 34 in FIG. 9 is a bent portion. From the viewpoint of ensuring strength, the bent portion 34 may be welded.
　突出部３２の突出寸法Ｌ１は、内寸Ｄ２に対し、好ましくは５％以上、より好ましくは１０％以上４０％以下、更に好ましくは１５％以上３５％以下に設定される。また、寸法Ｄ１が内寸Ｄ２に対して好ましくは２０％以上９５％以下、より好ましくは２５％以上８５％以下、更に好ましくは３０％以上７０％以下となるように、突出部３２の突出寸法Ｌ１が設定される。 The protrusion dimension L1 of the protrusion 32 is preferably set to 5% or more, more preferably 10% or more and 40% or less, and further preferably 15% or more and 35% or less with respect to the inner size D2. Further, the protruding dimension of the protruding portion 32 is such that the dimension D1 is preferably 20% or more and 95% or less, more preferably 25% or more and 85% or less, and further preferably 30% or more and 70% or less with respect to the inner dimension D2. L1 is set.
　変形例４に係る足元用発熱体１においても、上記実施形態に係る足元用発熱体１と同様の効果を発揮することができる。 The foot heating element 1 according to the modified example 4 can also exert the same effect as the foot heating element 1 according to the above embodiment.
　なお、図示は省略するが、裏側シート部２２と表側シート部２１とが筒状につながるシート材を用い、その二辺を接合することで袋状の袋体２を形成してもよい。また、強度を確保する観点から、残りの二辺を溶着してもよい。 Although not shown, a bag-shaped bag body 2 may be formed by using a sheet material in which the back side sheet portion 22 and the front side sheet portion 21 are connected in a tubular shape and joining the two sides thereof. Further, from the viewpoint of ensuring strength, the remaining two sides may be welded.
　（３．５）突出部の形状についての変形例（変形例５）
　上記実施形態に係る足元用発熱体１では、突出部３２は、突き出る方向に細長い形状であったが、突出部３２では、以下の変形例５－１から５－６に係る形状であってもよい。 (3.5) Deformation example regarding the shape of the protruding portion (Deformation example 5)
In the foot heating element 1 according to the above embodiment, the protruding portion 32 has an elongated shape in the protruding direction, but the protruding portion 32 has a shape according to the following modified examples 5-1 to 5-6. Good.
　（３．５．１）変形例５－１
　変形例５－１に係る足元用発熱体１では、突出部３２は、図１０（Ａ）に示すように、半円形状に形成されており、縁部３１と突出部３２とでなす入隅部分が、滑らかにつながる曲線ではなく、角を有する。突出部３２における発熱材料４側の縁をなす円弧の中心は、縁部３１上か、又は縁部３１よりも発熱材料４側に位置している。 (3.5.1) Modification 5-1
In the foot heating element 1 according to the modified example 5-1, the protruding portion 32 is formed in a semicircular shape as shown in FIG. 10 (A), and the inside corner formed by the edge portion 31 and the protruding portion 32. The parts have corners rather than curves that connect smoothly. The center of the arc forming the edge on the heat generating material 4 side of the protrusion 32 is located on the edge portion 31 or on the heat generating material 4 side of the edge portion 31.
　（３．５．２）変形例５－２
　変形例５－２に係る足元用発熱体１では、突出部３２は、図１０（Ｂ）に示すように、略長方形状に形成されており、突出部３２における突き出る方向の先端側の出隅部３２１は、略直角である。 (3.5.2) Modification 5-2
In the foot heating element 1 according to the modified example 5-2, the protruding portion 32 is formed in a substantially rectangular shape as shown in FIG. 10B, and the protruding corner of the protruding portion 32 on the tip side in the protruding direction. The part 321 is substantially a right angle.
　（３．５．３）変形例５－３
　変形例５－３に係る足元用発熱体１では、突出部３２は、図１０（Ｃ）に示すように、凸状部３２２と、三角状部３２３と、を備える。凸状部３２２は、突出部３２の基部である。三角状部３２３は、凸状部３２２の突き出る方向の先端面から、当該突き出る方向に突き出ている。三角状部は、先端に行くに従って、幅狭となるように、尖っている。 (3.5.3) Modification 5-3
In the foot heating element 1 according to the modified example 5-3, the protruding portion 32 includes a convex portion 322 and a triangular portion 323 as shown in FIG. 10 (C). The convex portion 322 is the base portion of the protruding portion 32. The triangular portion 323 protrudes from the tip surface of the convex portion 322 in the protruding direction in the protruding direction. The triangular portion is sharpened so as to become narrower toward the tip.
　（３．５．４）変形例５－４
　変形例５－４に係る足元用発熱体１では、突出部３２は、図１０（Ｄ）に示すように、略三角形状に形成されている。突出部３２は、突き出る方向に行くに従って、幅狭となるように尖っている。 (3.5.4) Modification 5-4
In the foot heating element 1 according to the modified example 5-4, the protruding portion 32 is formed in a substantially triangular shape as shown in FIG. 10 (D). The protruding portion 32 is sharpened so as to become narrower toward the protruding direction.
　（３．５．５）変形例５－５
　変形例５－５に係る足元用発熱体１では、突出部３２は、図１０（Ｅ）に示すように、突き出る方向に行くに従って、幅広となるように形成されている。突出部３２の幅方向の縁は、湾曲している。 (3.5.5) Modification 5-5
In the foot heating element 1 according to the modified example 5-5, the protruding portion 32 is formed so as to become wider as it goes in the protruding direction, as shown in FIG. 10 (E). The widthwise edge of the protrusion 32 is curved.
　（３．６）その他の変形例
　以下、その他の変形例を列挙する。 (3.6) Other Modification Examples The other modification examples are listed below.
　上記実施形態に係る足元用発熱体１は、ユーザの足裏５１と、靴６の内底６１との間に配置されたが、本開示では、足５の甲と靴６との間や、足５の側面と靴６との間に配置されてもよい。 The foot heating element 1 according to the above embodiment is arranged between the sole 51 of the user and the inner sole 61 of the shoe 6, but in the present disclosure, the heating element 1 for the foot is arranged between the instep of the foot 5 and the shoe 6. It may be arranged between the side surface of the foot 5 and the shoe 6.
　上記実施形態に係る足元用発熱体１は、突出部３２を二つ有していたが、三つ以上の突出部３２を有してもよい。 The foot heating element 1 according to the above embodiment has two protrusions 32, but may have three or more protrusions 32.
　上記実施形態に係る足元用発熱体１では、突出部３２が袋体２の長さ方向の中央部に形成されていたが、突出部３２は、長さ方向の一方の端部側に偏った位置に形成されてもよい。 In the foot heating element 1 according to the above embodiment, the protruding portion 32 is formed in the central portion of the bag body 2 in the length direction, but the protruding portion 32 is biased toward one end side in the length direction. It may be formed in position.
　上記実施形態及び各変形例に係る発熱体１では、突出部３２に対応する位置に凹み３３を有したが、凹み３３はなくてもよい。 The heating element 1 according to the above embodiment and each modification has a recess 33 at a position corresponding to the protrusion 32, but the recess 33 may not be present.
　本開示にて、「略平行」、又は「略直交」のように「略」を伴った表現が、用いられる場合がある。例えば、「略平行」とは、実質的に「平行」であることを意味し、厳密に「平行」な状態だけでなく、数％程度の誤差を含む意味である。他の「略」を伴った表現についても同様である。 In this disclosure, expressions with "abbreviation" such as "approximately parallel" or "approximately orthogonal" may be used. For example, "substantially parallel" means that it is substantially "parallel", and includes not only a strictly "parallel" state but also an error of about several percent. The same applies to other expressions with "abbreviations".
　また、本開示において「前端部」及び「前端」などのように、「…端部」と「…端」とで区別した表現が用いられている。例えば、「前端部」とは、「前端」を含む一定の範囲を持つ部分を意味する。他の「…端部」を伴った表現についても同様である。 Further, in the present disclosure, expressions that distinguish between "... end" and "... end" are used, such as "front end" and "front end". For example, the "front end" means a portion having a certain range including the "front end". The same applies to other expressions with "... end".
　（４）実施例
　以下、実施例として、本発明において突出部３２を設けたことによる効果を確認する試験を行った。ただし、本発明は、以下の実施例に限定されない。 (4) Examples Hereinafter, as an example, a test for confirming the effect of providing the protruding portion 32 in the present invention was conducted. However, the present invention is not limited to the following examples.
　実施例１～３として、接合部に突出部を有する発熱体を製造し、比較例として、接合部に突出部を有さない発熱体を製造し、発熱時の発熱面の温度をサーモグラフィーで撮影して、温度分布を比較した。 As Examples 1 to 3, a heating element having a protruding portion at the joint portion is manufactured, and as a comparative example, a heating element having no protruding portion at the joint portion is manufactured, and the temperature of the heat generating surface at the time of heat generation is photographed by thermography. Then, the temperature distribution was compared.
　実施例１～３及び比較例に係る発熱体として、図１１（Ａ）～図１１（Ｄ）に示すように、発熱面を略矩形状に形成し、発熱面の長さ寸法Ｅ１（最長部）＝１８１ｍｍ、発熱面の幅寸法Ｗ＝１１６ｍｍの発熱体を製造した。実施例１～３及び比較例に係る発熱体では、発熱材料及び袋体の素材は、上記実施形態と同様であり、全て共通したものを使用した。また、実施例１～３及び比較例の各々の発熱材料の量を７０ｇにして、すべてを共通した重量とした。 As the heating elements according to Examples 1 to 3 and Comparative Examples, as shown in FIGS. 11A to 11D, the heating surface is formed in a substantially rectangular shape, and the length dimension E1 (longest portion) of the heating surface is formed. ) = 181 mm, and a heating element having a heating surface width dimension W = 116 mm was manufactured. In the heating elements according to Examples 1 to 3 and Comparative Examples, the heating material and the material of the bag body were the same as those in the above embodiment, and all common materials were used. Further, the amount of the heat generating material of each of Examples 1 to 3 and Comparative Example was set to 70 g, and all of them had a common weight.
　実施例１に係る発熱体として、図１１（Ａ）に示すように、一対の突出部を発熱面の一端からＥ２＝９０．５ｍｍの位置（つまり長さ方向の中央）に形成し、各突出部の突出寸法Ｌ２＝２０ｍｍとした。 As a heating element according to the first embodiment, as shown in FIG. 11A, a pair of protrusions are formed at a position of E2 = 90.5 mm (that is, the center in the length direction) from one end of the heat generation surface, and each protrusion is formed. The protruding dimension L2 of the portion was set to 20 mm.
　実施例２に係る発熱体として、図１１（Ｂ）に示すように、一対の突出部を発熱面の一端からＥ２＝９０．５ｍｍの位置（つまり長さ方向の中央）に形成し、各突出部の突出寸法Ｌ３＝３５．５ｍｍとした。 As a heating element according to the second embodiment, as shown in FIG. 11B, a pair of protrusions are formed at a position of E2 = 90.5 mm (that is, the center in the length direction) from one end of the heat generation surface, and each protrusion is formed. The protruding dimension of the portion was set to L3 = 35.5 mm.
　実施例３に係る発熱体として、図１１（Ｃ）に示すように、一対の突出部を発熱面の一端からＥ３＝１３４．７５ｍｍの位置に形成し、各突出部の突出寸法Ｌ３＝３５．５ｍｍとした。 As a heating element according to the third embodiment, as shown in FIG. 11C, a pair of protruding portions are formed at a position of E3 = 134.75 mm from one end of the heating surface, and the protruding dimensions of each protruding portion L3 = 35. It was set to 5 mm.
　実施例１，２と比較例とを並べてサーモグラフィーを用いて撮影した結果（結果１）を、図１２に示す。また、サーモグラフィーで撮影した結果から、各温度範囲における面積を算出し、各温度範囲と、その温度範囲における全体に対する面積比との関係を表１－１に示す。また、高温域（最高温度－５℃以上で、かつ最高温度以下の温度域）の面積比について、表１－１から抽出したものを表１－２に示す。 FIG. 12 shows the results (result 1) of the examples 1 and 2 and the comparative example taken side by side using thermography. In addition, the area in each temperature range is calculated from the result of photographing by thermography, and the relationship between each temperature range and the area ratio to the whole in the temperature range is shown in Table 1-1. Table 1-2 shows the area ratio of the high temperature range (the temperature range of the maximum temperature of -5 ° C or higher and lower than the maximum temperature) extracted from Table 1-1.
　また、結果１とは撮影場所を変えて、実施例２，３と比較例とを並べてサーモグラフィーを用いて撮影した結果（結果２）を、図１３に示す。また、サーモグラフィーで撮影した結果から、各温度範囲における面積を算出し、各温度範囲と、その温度範囲における全体に対する面積比との関係を表２－１に示す。また、高温域の面積比について、表２－１から抽出したものを表２－２示す。 Further, FIG. 13 shows the result (result 2) of taking a picture using thermography by arranging Examples 2 and 3 and the comparative example side by side at a different shooting location from the result 1. Further, the area in each temperature range is calculated from the result of photographing by thermography, and the relationship between each temperature range and the area ratio to the whole in the temperature range is shown in Table 2-1. Table 2-2 shows the area ratio of the high temperature region extracted from Table 2-1.
　表１－１をグラフ化したものを図１４に示し、表２－１をグラフ化したものを図１５に示す。グラフでは、縦軸を面積比（％）とし、横軸を温度（℃）とした。 A graph of Table 1-1 is shown in FIG. 14, and a graph of Table 2-1 is shown in FIG. In the graph, the vertical axis is the area ratio (%) and the horizontal axis is the temperature (° C.).
　結果１において、実施例１，２と比較例との各々について、表１－１から最高温度を抽出し、比較例と実施例１，２との最高温度の差を算出した。さらに、実施例１，２と比較例との各々の発熱面における平均温度を算出し、比較例と実施例１，２との平均温度の差を算出した。この結果を表３に示す。
Figure JPOXMLDOC01-appb-T000001
Figure JPOXMLDOC01-appb-T000002
Figure JPOXMLDOC01-appb-T000003
Figure JPOXMLDOC01-appb-T000004
Figure JPOXMLDOC01-appb-T000005
 In Result 1, the maximum temperature was extracted from Table 1-1 for each of Examples 1 and 2 and Comparative Example, and the difference in maximum temperature between Comparative Example and Examples 1 and 2 was calculated. Further, the average temperature on each heat generating surface of Examples 1 and 2 and Comparative Example was calculated, and the difference in average temperature between Comparative Example and Examples 1 and 2 was calculated. The results are shown in Table 3.
Figure JPOXMLDOC01-appb-T000001
Figure JPOXMLDOC01-appb-T000002
Figure JPOXMLDOC01-appb-T000003
Figure JPOXMLDOC01-appb-T000004
Figure JPOXMLDOC01-appb-T000005
　結果１では、図１２からわかるように、比較例では発熱面の中央に高い温度を示す白色部が濃くはっきりと存在するが、実施例１，２に係る発熱体は、白色部が比較例よりも薄くなっている。また、表１－１、表１－２及び図１４からもわかるように、実施例１，２に係る発熱体は、比較例に比べて、高温域の面積比が増加しており、かつ最高温度が１℃～２℃下がった。 In Result 1, as can be seen from FIG. 12, in the comparative example, a white portion showing a high temperature is dark and clearly present in the center of the heating surface, but in the heating element according to Examples 1 and 2, the white portion is larger than that in the comparative example. Is also getting thinner. Further, as can be seen from Table 1-1, Table 1-2 and FIG. 14, the heating elements according to Examples 1 and 2 have an increased area ratio in the high temperature region and are the highest as compared with the comparative examples. The temperature dropped by 1 ° C to 2 ° C.
　結果２では、図１３からわかるように、比較例では発熱面の中央に高い温度を示す白色部が濃くはっきりと存在するが、実施例２，３に係る発熱体は、白色部が比較例よりも薄くなっている。また、表２－１、表２－２及び図１５からもわかるように、実施例２，３に係る発熱体は、比較例に比べて、高温域の面積比が、略同じかそれ以上であり、かつ最高温度が１℃程度下がった。 In Result 2, as can be seen from FIG. 13, in the comparative example, a white portion showing a high temperature is dark and clearly present in the center of the heat generating surface, but in the heating elements according to Examples 2 and 3, the white portion is larger than that in the comparative example. Is also getting thinner. Further, as can be seen from Tables 2-1 and 2-2 and FIG. 15, the heating elements according to Examples 2 and 3 have substantially the same or higher area ratio in the high temperature region as compared with Comparative Examples. Yes, and the maximum temperature dropped by about 1 ° C.
　したがって、実施例１～３に係る発熱体では、比較例に比べて、発熱面における高温域の面積比を同等以上に保ちながら、最高温度を下げることができる。要するに、実施例１～３に係る発熱体では、発熱面における局所的な高い温度上昇を抑えることができる。 Therefore, in the heating elements according to Examples 1 to 3, the maximum temperature can be lowered while maintaining the area ratio of the high temperature region on the heat generating surface to be equal to or higher than that of the comparative example. In short, in the heating elements according to Examples 1 to 3, it is possible to suppress a locally high temperature rise on the heat generating surface.
　特に、表１－２及び表２－２からもわかるように、実施例１，２に係る発熱体では、高温域の面積比が、比較例よりも３．４～６．７％程度増加しており、かつ最高温度が比較例に比べて１℃～２℃下がった。したがって、突出部を発熱面の中央部に対応する位置に配置すると、比較例に比べて、発熱面の最高温度を下げることができ、かつ高温域の面積を広くすることができることがわかる。すなわち、突出部を発熱面の中央部に対応する位置に配置することで、発熱面の温度分布の均一性を高めることができる。 In particular, as can be seen from Tables 1-2 and 2-2, in the heating elements according to Examples 1 and 2, the area ratio in the high temperature region increased by about 3.4 to 6.7% as compared with the comparative example. And the maximum temperature was 1 ° C to 2 ° C lower than that of the comparative example. Therefore, it can be seen that when the protruding portion is arranged at a position corresponding to the central portion of the heat generating surface, the maximum temperature of the heat generating surface can be lowered and the area of the high temperature region can be widened as compared with the comparative example. That is, by arranging the protruding portion at a position corresponding to the central portion of the heat generating surface, the uniformity of the temperature distribution of the heat generating surface can be improved.
　また、表３からもわかるように、実施例１，２に係る発熱体では、比較例に比べて、最高温度の差が約１～２℃であるのに対し、平均温度の差が０．１～０．６℃であった。つまり、実施例１，２に係る発熱体は、比較例との対比において、最高温度の下がり幅に比べて、平均温度の下がり幅が小さくなった。すなわち、突出部を発熱面の中央部に対応する位置に配置することで、発熱面の最高温度を下げつつも平均温度の低下を抑制することができる。 Further, as can be seen from Table 3, in the heating elements according to Examples 1 and 2, the difference in the maximum temperature is about 1 to 2 ° C. as compared with the comparative example, whereas the difference in the average temperature is 0. It was 1 to 0.6 ° C. That is, in the heating elements according to Examples 1 and 2, the decrease in the average temperature was smaller than the decrease in the maximum temperature in comparison with the comparative example. That is, by arranging the protruding portion at a position corresponding to the central portion of the heat generating surface, it is possible to suppress the decrease in the average temperature while lowering the maximum temperature of the heat generating surface.
　また、図１３からもわかるように、実施例３に係る発熱体では、比較例に比べて、高温域が、長さ方向において、突出部とは反対側に偏った位置に移動した。すなわち、突出部を袋体の長さ方向の一方の端部側に偏った位置に形成することで、高温域を袋体の長さ方向の中央部から移動させることができることがわかった。 Further, as can be seen from FIG. 13, in the heating element according to the third embodiment, the high temperature region moved to a position biased to the side opposite to the protruding portion in the length direction as compared with the comparative example. That is, it was found that the high temperature region can be moved from the central portion in the length direction of the bag body by forming the protruding portion at a position biased toward one end side in the length direction of the bag body.
　１　　　　足元用発熱体
　２　　　　袋体
　２１　　　表側シート部
　２２　　　裏側シート部
　３　　　　接合部
　３１　　　縁部
　３２　　　突出部
　３３　　　凹み
　Ｄ２　　　内寸
　４　　　　発熱材料
　５　　　　足
　６　　　　靴 1 Heating element for feet 2 Bag body 21 Front side seat part 22 Back side seat part 3 Joint part 31 Edge part 32 Protruding part 33 Recessed D2 Inner size 4 Heat generating material 5 Feet 6 Shoes

Claims (5)

  1. 　ユーザの足と靴との間に配置される足元用発熱体であって、
    　表側シート部及び裏側シート部で袋状に形成された袋体と、
    　前記袋体に封入された発熱材料と、
    を備え、
    　前記袋体は、前記表側シート部と前記裏側シート部とが接合された接合部を有し、
    　前記接合部は、
    　　前記袋体の外周の少なくとも一部に沿って形成された縁部と、
    　　前記縁部から前記発熱材料側に突き出る突出部と、
    を含む、
    足元用発熱体。     A heating element for the feet that is placed between the user's feet and shoes.
    A bag body formed in a bag shape by the front side sheet part and the back side sheet part,
    The heat-generating material enclosed in the bag body and
    With
    The bag body has a joint portion in which the front side sheet portion and the back side sheet portion are joined.
    The joint
    With an edge formed along at least a part of the outer circumference of the bag body,
    A protruding portion protruding from the edge portion toward the heat generating material side,
    including,
    Heating element for feet.
  2. 　前記突出部の突出寸法は、前記突出部が突き出る方向における前記突出部に対応する位置での前記袋体の内寸に対して、１５％以上３５％以下である、
    請求項１記載の足元用発熱体。     The protruding dimension of the protruding portion is 15% or more and 35% or less with respect to the inner dimension of the bag body at a position corresponding to the protruding portion in the direction in which the protruding portion protrudes.
    The heating element for feet according to claim 1.
  3. 　前記突出部が突き出る方向において、前記突出部と、当該突出部に対向する部分との間の寸法は、前記突出部に対応する位置での前記袋体の内寸に対して、３０％以上７０％以下である、
    請求項１又は請求項２記載の足元用発熱体。     In the direction in which the protruding portion protrudes, the dimension between the protruding portion and the portion facing the protruding portion is 30% or more 70 with respect to the inner dimension of the bag body at the position corresponding to the protruding portion. % Or less,
    The heating element for feet according to claim 1 or 2.
  4. 　前記突出部を複数含み、
    　前記複数の突出部の突き出る方向が一直線に沿っている、
    請求項１～４のいずれか一項に記載の足元用発熱体。     Including a plurality of the protrusions
    The protruding directions of the plurality of protrusions are in a straight line.
    The heating element for feet according to any one of claims 1 to 4.
  5. 　前記袋体の外縁には、前記突出部に対応する箇所に凹みが形成されている、
    請求項１～４のいずれか一項に記載の足元用発熱体。     A recess is formed on the outer edge of the bag body at a portion corresponding to the protruding portion.
    The heating element for feet according to any one of claims 1 to 4.
PCT/JP2020/025949 2019-07-10 2020-07-02 Foot warmer WO2021006165A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2019-128476 2019-07-10
JP2019128476A JP7321808B2 (en) 2019-07-10 2019-07-10 Foot heating element

Publications (1)

Publication Number Publication Date
WO2021006165A1 true WO2021006165A1 (en) 2021-01-14

Family

ID=74115207

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Application Number Title Priority Date Filing Date
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JP (1) JP7321808B2 (en)
WO (1) WO2021006165A1 (en)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH09276317A (en) * 1996-04-11 1997-10-28 Genchi Kenkyusho:Kk Heating element for foot warmer and method for producing the same
JP2002291789A (en) * 2001-03-29 2002-10-08 Impress:Kk Human body part application device, heat-retaining device, cooling device, and bag storing carbonized substance
JP2003334211A (en) * 2002-05-20 2003-11-25 Maikooru Kk Leg-warming exothermic body and method for producing leg-warming exothermic body

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS56130721U (en) * 1980-03-04 1981-10-03
JPH05115310A (en) * 1991-07-15 1993-05-14 Takashi Kiyohara Heating mid sheet for shoes
JPH05176951A (en) * 1991-12-26 1993-07-20 Takashi Kiyohara Throw-way foot warmer
JP3366104B2 (en) * 1994-03-18 2003-01-14 フェリック株式会社 Heating element for feet

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH09276317A (en) * 1996-04-11 1997-10-28 Genchi Kenkyusho:Kk Heating element for foot warmer and method for producing the same
JP2002291789A (en) * 2001-03-29 2002-10-08 Impress:Kk Human body part application device, heat-retaining device, cooling device, and bag storing carbonized substance
JP2003334211A (en) * 2002-05-20 2003-11-25 Maikooru Kk Leg-warming exothermic body and method for producing leg-warming exothermic body

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JP7321808B2 (en) 2023-08-07
TW202108099A (en) 2021-03-01

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