Heat generating body

Abstract

To provide a heat generating body capable of reducing peeling even when it is attached near a moving part of a human body.SOLUTION: A heat generating body 10 includes a main body 1 in which a storage part 18 is formed by joining outer peripheries of a front-side sheet part 11 and a back-side sheet part 12, a pair of adhesive parts 2 extending from respective edges on both sides in a lateral left-right direction of the main body 1 and having an adhesive layer 3 on one surface, and a heat generating material 4 stored in the storage part 18. Out of the edges on both sides in the lateral direction of the main body 1, a region on one side with respect to a center line C1 passing through a center in a longitudinal direction of the main body 1 and parallel to the lateral direction, includes a connection region between the main body 1 and each of the adhesive parts 2, and a region on the other side is entirely a non-connection region where the main body 1 and each of the adhesive parts 2 are not connected to each other.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a heating element. [Background technology]

[0002] Patent Document 1 describes a conventional heating element (called a heating device in Patent Document 1). The heating device described in Patent Document 1 is attached, for example, to the back of the neck (nape). The heating device comprises an inner bag formed into a bag shape by joining a first sheet and a second sheet, a heating layer disposed within the inner bag, and an adhesive layer provided on one surface of the inner bag. The adhesive layer is formed over the entire surface of one surface of the inner bag, and is formed into a rectangular shape in a plan view. The adhesive layer allows the heating device to be attached to the user's skin. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2019-37775 A Summary of the Invention [Problem to be solved by the invention]

[0004] However, as mentioned above, the heating device described in Patent Document 1 has an adhesive layer over the entire surface of the inner bag. Therefore, when the heating device of Patent Document 1 is attached to a movable part such as the back of the neck, if the user moves their head by looking up, the head applies force to the heating device from above and on the human body side, which causes the heating device to easily peel off.

[0005] The present invention has been made in consideration of the above circumstances, and has an object to provide a heating element that is less likely to come off even when attached near a moving part of the human body. [Means for solving the problem]

[0006] A heating element according to one aspect of the present invention comprises a main body having a storage section formed by joining the outer peripheries of a front sheet section and a back sheet section, a pair of attachment sections extending from both lateral and lateral edges of the main body and having an adhesive layer on one surface, and a heating material stored in the storage section. With respect to a center line passing through the vertical center of the main body and parallel to the horizontal direction, a region on one side includes a connection region between the main body and each of the attachment sections, and a region on the other side is a non-connection region in which the main body and each of the attachment sections are not connected. Effect of the Invention

[0007] The heating element according to the above aspect of the present invention has an advantage that it is less likely to come off even when attached to the vicinity of a moving part of the human body. [Brief description of the drawings]

[0008] [Figure 1] FIG. 1 is a schematic perspective view of the heating device according to this embodiment in use. [Diagram 2] FIG. 2 is a schematic rear view of the heating device according to the embodiment, as viewed from the rear side. [Diagram 3] FIG. 3 is a cross-sectional view taken along line AA in FIG. [Figure 4] Fig. 4(A) is a schematic front view of a heating implement according to a modified example, Fig. 4(B) is a schematic front view of a heating implement according to a further modified example, and Fig. 4(C) is a schematic front view of a heating implement according to a further modified example. [Diagram 5] FIG. 5 is a schematic front view of a heating implement according to a further modified example. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] <Embodiment> The heating element 10 according to this embodiment will be described in detail below with reference to the drawings.

[0010] The heating element 10 is attached to a movable part such as the nape of the user's neck (rear of the neck) as shown in Fig. 1. The heating element 10 according to this embodiment includes a main body 1 having a heat generating region, and a pair of adhesive parts 2 extending from both lateral edges of the main body 1. As shown in Fig. 2, at least one region of both lateral edges of the main body 1 includes a connection region between the main body 1 and each adhesive part 2 with respect to a center line C1 that passes through the center of the main body 1 in the vertical direction and is parallel to the horizontal direction, and the other region is an unconnected region where the main body 1 and each adhesive part 2 are not connected.

[0011] Therefore, when the heating element 10 according to the present embodiment is attached to the nape of the neck with one side of the main body 1 positioned below and the other side positioned above, as shown in Fig. 1, the heating element 10 is unlikely to come off even if the head pushes the main body 1 outward when the user moves the head. That is, when an external force is applied to the main body 1 from above and from the human body side, the part of the main body 1 above the center line C1 bends in a direction away from the human body, but since the attachment part 2 is connected only below the center line C1, the movement of the main body 1 is unlikely to be transmitted to the attachment part 2, and the attachment part 2 is unlikely to come off. Therefore, according to the heating element 10 according to the present embodiment, even if it is attached near a movable part, it is possible to reduce the possibility of the heating element 1 coming off.

[0012] In the heating element 10 according to the present embodiment, examples of the movable parts of the user that are the attachment target parts include the nape of the neck, as well as the knees, backs of the knees, elbows, shoulders, shoulder blades, etc. In the present embodiment, the nape of the neck of the user is taken as an example of the movable part to which the heating element 10 is attached.

[0013] As shown in Fig. 2, the heating element 10 according to this embodiment includes a main body 1 having a housing portion 18, a pair of attachment portions 2 having an adhesive layer 3, and a heating material 4 (Fig. 3) filled in the housing portion 18. The heating element 10 is flexible. The heating element 10 according to this embodiment is a disposable warmer, but may also be a reusable warmer.

[0014] In the following description, for convenience of explanation, as shown in FIG. 2, the longitudinal direction of the main body 1 is defined as the "horizontal direction" and the lateral direction of the main body 1 is defined as the "vertical direction". The horizontal and vertical directions are perpendicular to each other. One side of the vertical direction is defined as the "lower side" and the other side as the "upper side". The direction perpendicular to the vertical and horizontal directions is defined as the "thickness direction". In addition, in the heating element 10, the surface facing the user's skin is defined as the "rear surface" and the opposite surface is defined as the "front surface". However, the definitions of these directions are merely for explanation and are not intended to specify the manner of use of the heating element 10.

[0015] In addition, in this specification, "parallel" refers not only to two straight lines, surfaces, etc. (hereinafter referred to as "straight lines") that do not intersect even when extended, but also to two straight lines, etc. that intersect at an angle of 10° or less. Furthermore, "orthogonal" refers to two straight lines, etc. that intersect at an angle of 90°±10°. However, even if two straight lines, etc. do not intersect directly, if they intersect when extended, they are included in the term "orthogonal."

[0016] In addition, the term "vertical center of the main body" in this specification means a central point on a line segment of the shortest length from a virtual line passing through a point on the most one side (lower side) in the vertical direction of the main body and parallel to the horizontal direction to a virtual line passing through a point on the most other side (upper side) in the vertical direction and parallel to the horizontal direction. Similarly, the term "horizontal center of the main body" means a central point on a line segment of the shortest length from a virtual line passing through a point on the most end of the first side (e.g., left side) in the horizontal direction of the main body and parallel to the vertical direction to a virtual line passing through a point on the most end of the second side (e.g., right side) in the horizontal direction and parallel to the vertical direction. The "first side" of the main body and the "second side" of the main body here refer to opposite sides in the horizontal direction.

[0017] (Main body 1) The main body 1 is a portion of the heating element 10 in which the heat generating region is surrounded by the joint 13. The main body 1 is formed by overlapping a front sheet portion 11 and a back sheet portion 12 and joining the outer periphery at the joint 13. The portion between the front sheet portion 11 and the back sheet portion 12 and surrounded by the joint 13 is a bag-shaped storage portion 18 in which the heat generating material 4 is stored.

[0018] The outer periphery of the main body 1 is made up of a lower edge portion 14 extending laterally, a pair of side edge portions 15, and a pair of arcuate portions 16.

[0019] The lower edge portion 14 includes a pair of straight portions 141 that are parallel to each other in the horizontal direction and spaced apart from each other, a pair of recessed portions 142 that are connected inwardly to the straight portions 141 and recessed upward, and a generally V-shaped protruding portion 143 formed between the pair of recessed portions 142. The recessed portion 142 is formed in a curved shape and smoothly connects to the straight portions 141 and the protruding portion 143. The tip of the protruding portion 143 is located in the center of the main body portion 1 in the horizontal direction and protrudes downward from the recessed portion 142.

[0020] The side edge 15 extends in the vertical direction. At least a portion of the side edge 15 is connected to the adhesive part 2. In this embodiment, a portion of the side edge 15 is integrally formed with the adhesive part 2, and therefore the connection portion with the adhesive part 2 is an imaginary boundary line.

[0021] The arc portion 16 connects the side edge portion 15 and the upper end at the center of the main body portion 1 in the horizontal direction. The arc portion 16 is a curve having an arc at least in a part. The curve of the arc portion 16 does not need to have the same curvature from one end to the other end. The uppermost point of the arc portion 16 may be referred to as "apex P1". The pair of apexes P1 of the pair of arc portions 16 are narrowed between them, forming a substantially V-shape. This V-shaped narrowed portion may be referred to as a narrow portion 17. The narrow portion 17 according to this embodiment is located in the center of the main body portion 1 in the horizontal direction. The tip of the narrow portion 17 may be referred to as a "valley point P2".

[0022] Here, the horizontal edge of the main body 1 means an edge whose direction along the edge has a component parallel to the vertical direction. In this embodiment, the horizontal edge of the outer periphery of the main body 1 is composed of the side edge 15 and the range from the end of the arc portion 16 connected to the side edge 15 to the apex P1.

[0023] The joint 13 is a portion where the front sheet portion 11 and the back sheet portion 12 are joined. In this embodiment, the joint 13 is formed by welding (heat sealing). However, the joint 13 is not limited to welding, and may be formed by, for example, adhesion, sewing, crimping, etc.

[0024] The joint 13 includes an outer peripheral joint 131 and an intermediate joint 132. The outer peripheral joint 131 is formed along the outer peripheral edge of the front sheet portion 11 and the outer peripheral edge of the back sheet portion 12. The outer peripheral joint 131 is formed to have approximately the same width over its entire length. The intermediate joint 132 is provided inside the outer peripheral joint 131. As a result, the intermediate joint 132 divides the area inside the outer peripheral joint 131 into multiple areas. In this embodiment, the intermediate joint 132 extends along the vertical direction at the center in the horizontal direction of the main body 1. However, a plurality of intermediate joints 132 may be provided, and may be formed at regular intervals in the horizontal direction, for example.

[0025] The storage section 18 according to this embodiment is surrounded by an outer circumferential joint portion 131 and an intermediate joint portion 132. The main body portion 1 has a plurality of storage sections 18, but may have only one storage section 18. In other words, the intermediate joint portion 132 may not be present.

[0026] (Adhesive part 2) The adhesive part 2 is a part of the heating element 10 that is attached to the user. An adhesive layer 3 is provided on one surface (rear surface) of the adhesive part 2 (in FIG. 2, the adhesive layer 3 is indicated by dots). The adhesive part 2 extends outward in the lateral direction from a side edge part 15 of the main body part 1. The adhesive part 2 comprises an adhesive part main body 21 that protrudes laterally from the side edge part 15, and an extension part 22 that protrudes from the adhesive part main body 21. The extension part 22 is not connected to the main body part 1. In this specification, not being connected may be referred to as "not connected".

[0027] The adhesive part main body 21 is connected only in the region below the center line C1 (on one side in the vertical direction) of the lateral edge of the main body 1. In this embodiment, the adhesive part main body 21 is connected to a certain range including the lower end of the side edge portion 15. That is, at least the region above the center line C1 (on the other side in the vertical direction) of the lateral edge of the main body 1 is an unconnected region. The unconnected region is a region where the adhesive part 2 is not connected to the lateral edge of the main body 1, and is separated from the extension part 22 via, for example, a slit (see, for example, FIG. 5), a notch, or the like. In this embodiment, the unconnected region is separated from the adhesive part 2 by a triangular notch 5. The unconnected region may be included in the region below the center line C1.

[0028] The notch 5 forms an edge 25 of the adhesive part 2 that faces the non-connected region. The angle α between the edge 25 of the adhesive part 2 that faces the non-connected region and the vertical direction is preferably 0° or more and 50° or less, and more preferably 15° or more and 45° or less. This configuration reduces bending due to the force from the movable part, making the adhesive part 2 less likely to peel off.

[0029] Here, the "center line C1" in this specification means an imaginary straight line that passes through the vertical center of the main body 1 and is parallel to the horizontal direction. The center line C1 in this embodiment is a straight line that passes through the middle point between the uppermost point (vertex P1) and the lowermost point (a point on the lower edge 14 or the tip of the protrusion 143) of the main body 1 in the vertical direction.

[0030] In this embodiment, a part of the upper side of the side edge 15 of the main body 1 is a non-connected region, and the remaining part is a connected region with the adhesive part main body 21. The distance from the lower edge 14 of the main body 1 to the upper end of the connected region is preferably 50% or less, more preferably 45% or less, and even more preferably 40% or less, of the maximum vertical distance of the main body 1. On the other hand, the lower limit of the distance from the lower edge 14 of the main body 1 to the upper end of the connected region is preferably 25% or more, more preferably 30% or less, and even more preferably 35% or less, of the maximum vertical distance of the main body 1. By setting the distance from the lower edge 14 of the main body 1 to the upper end of the connected region to be 25% or more and 50% or less of the maximum vertical distance of the main body 1, the movement of the main body 1 is less likely to be transmitted to the adhesive part 2, and the adhesive part 2 and the main body 1 are less likely to be separated.

[0031] The "maximum vertical distance of the main body 1" here means the smallest distance from an imaginary line passing through the vertically most side (lowest) point of the main body and parallel to the horizontal direction to an imaginary line passing through the vertically most side (upper) point of the main body and parallel to the horizontal direction.

[0032] The horizontal length of each sticking part body 21 is preferably 0.8 times or more, and more preferably 1.0 times or more, the vertical length of the connection area, while the horizontal length of each sticking part body 21 is preferably 2 times or less, and more preferably 1.8 times or less, and even more preferably 1.5 times or less, the vertical length of the connection area.

[0033] The expansion portion 22 protrudes from the adhesive part main body 21 and expands the adhesive area of ​​the adhesive part main body 21. In this embodiment, the expansion portion 22 protrudes upward from the adhesive part main body 21. The area of ​​the expansion portion 22 may be smaller or larger than that of the adhesive part main body 21.

[0034] It is preferable that the upper end of the extension portion 22 (upper end 24 of the adhesive portion) is located above the center line C1. This allows the adhesive area to be expanded without widening the adhesive portion 2 in the lateral direction. However, it is preferable that the upper end of the extension portion 22 (upper end 24 of the adhesive portion) is located below the uppermost point (vertex P1) of the main body portion 1. This allows the adhesive area to be expanded while reducing adhesion of the adhesive portion 2 to the user's hair. In this embodiment, in the vertical direction, the upper end of the extension portion 22 (upper end 24 of the adhesive portion) is located between the vertex P1 and the center line C1 of the main body portion 1.

[0035] The adhesive part 2 is preferably configured by overlapping the front sheet part 11 and the back sheet part 12. The front sheet part 11 and the back sheet part 12 that configure the adhesive part 2 are preferably partially joined. Specifically, in the adhesive part 2, the front sheet part 11 and the back sheet part 12 are joined at one point, a dot-like joint part 23 formed at a rounded corner part formed by the lower edge and the side edge. By configuring in this way, compared to the adhesive part 2 in which the front sheet part 11 and the back sheet part 12 are joined over the entire surface, the adhesive part 2 is more flexible and easier to deform, so that the user is less likely to feel pain when moving his / her head while wearing it, and further, the adhesive part 2 can be made to adhere to the skin more easily.

[0036] The area of ​​the adhesive layer 3 in the attachment part 2 is preferably 15% or more, more preferably 20% or more, and even more preferably 25% or more, relative to the area of ​​the main body part 1. On the other hand, the area of ​​the adhesive layer 3 in the attachment part 2 is preferably 65% ​​or less, more preferably 60% or less, and even more preferably 55% or less, relative to the area of ​​the main body part 1. When the area of ​​the adhesive layer 3 in the attachment part 2 is 25% or more relative to the area of ​​the main body part 1, the adhesive strength to the user can be kept high. When the area of ​​the adhesive layer 3 in the attachment part 2 is 30% or less relative to the area of ​​the main body part 1, the adhesion to hair can be reduced and the burden on the skin can be reduced. The area of ​​the adhesive layer 3 in the attachment part 2 here means the total area of ​​the adhesive layer 3 on the multiple attachment parts 2.

[0037] The adhesive layer 3 is provided at least on the attachment portion 2, but may be provided on the main body portion 1 in addition to the attachment portion 2. In this embodiment, the adhesive layer 3 is provided on the attachment portion 2 as well as on a part of the intermediate bonding portion 132 and the outer circumferential bonding portion 131. However, it is preferable that the adhesive layer 3 is out of the area corresponding to the storage portion 18. This can reduce the weakening of the adhesive force between the adhesive layer 3 and the skin even if the area corresponding to the storage portion 18 becomes hot and the user sweats at that area. The area of ​​the adhesive layer 3 provided on the main body portion 1 is preferably 20% or less, more preferably 15% or less, of the area of ​​the main body portion 1. This can reduce the discomfort felt when the heating element 10 is attached near the movable portion. If the area of ​​the adhesive layer 3 provided on the main body portion 1 becomes too large, the adhesion of the heating element 10 to the user becomes too high, and the discomfort felt when the heating element 10 is attached to the movable portion becomes strong.

[0038] In this embodiment, the adhesive layer 3 is present continuously over the entire surface of one side of the adhesive portion 2, but may be present, for example, in the form of stripes or dots (polka dots) spaced at regular intervals.

[0039] The adhesive layer 3 is not particularly limited, but examples thereof include acrylic adhesives, vinyl adhesives, vinyl acetate adhesives, polyvinyl acetal adhesives, vinyl chloride adhesives, cellulose adhesives, chloroprene adhesives, nitrile rubber adhesives, styrene rubber adhesives, silicone rubber adhesives, polysulfide adhesives, terpene resins, water-soluble rosin, and other adhesives. From the viewpoint of ensuring an adhesive strength that is neither too strong nor too weak, it is preferable to use a styrene rubber adhesive.

[0040] The front sheet portion 11 and the back sheet portion 12 constituting the main body portion 1 and the adhesive portion 2 are preferably made of a resin film. The resin used for the resin film is preferably a thermoplastic resin. Examples of the thermoplastic resin include polyethylene, polypropylene, polyester, polyamide, polyurethane, polystyrene, polyvinyl alcohol, polyvinyl chloride, polyvinylidene chloride, polycarbonate, and ethylene-vinyl acetate copolymer. These resins may be used alone or in combination of two or more.

[0041] In addition, from the viewpoint of improving the feel on the skin, absorbing sweat, and increasing the anchoring property of the glue, it is preferable that the back sheet portion 12 has a woven fabric or nonwoven fabric on the outside of the resin film. Examples of the fiber material of the woven fabric or nonwoven fabric include natural fibers such as cotton, hemp, silk, and paper, semi-synthetic fibers such as rayon and acetate, synthetic fibers such as nylon, vinylon, polyester, acrylic, polyethylene, polypropylene, polyvinyl chloride, and polybutylene terephthalate, and mixed fibers of these fibers. Among these, nylon, polyester, polypropylene, and the like 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 kinds. The basis weight of the woven fabric or nonwoven fabric is not particularly limited as long as it is sufficient to prevent the heat generating material 4 from leaking from the main body portion 1, but as an example, it is 20 g / m 2 More than 70g / m 2 The following is an example:

[0042] However, the main body 1 and the attachment part 2 do not have to be a laminate of a resin film and a woven or nonwoven fabric, and may be composed of a single resin film, or a single woven or nonwoven fabric.

[0043] In addition, the main body 1 has breathability. Since the resin film is a porous film or a resin film having a plurality of ventilation holes formed therein, the main body 1 has a plurality of ventilation holes and can ventilate through the plurality of ventilation holes.

[0044] (heat generating material 4) The heat generating material 4 is a material that is contained in the container 18 and can generate heat, as shown in Fig. 3. The heat generating material 4 according to this embodiment undergoes an oxidation reaction when it comes into contact with air, and generates heat. The heat generating material 4 is a powder material.

[0045] The heat generating material 4 includes, for example, an oxidizable metal, activated carbon, carbon black, a water retention agent, a metal salt (for example, table salt), and water. The oxidizable metal 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. Among these, it is preferable to use iron powder from the viewpoints of handling, safety, production cost, storage property, 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, perlite, silica gel, alumina, water-absorbent resin, and the like. The heat generating material 4 may be a powdered composition used in conventional disposable warmers as it is, and is not particularly limited in the present invention.

[0046] Materials other than those that generate heat upon contact with air may be used as the heat generating material 4. For example, materials that generate heat when irradiated with microwaves in a microwave oven or the like (e.g., ceramic powder such as ferrite, red beans, etc.) or chemical liquids that generate heat by utilizing heat of solidification may be used.

[0047] (Example of use) The heating element 10 thus configured is placed so that the user's movable part (head) is located above the main body part 1, as shown in FIG. 1, and is attached by adhering the adhesive part 2 to the skin. In this state, when the user moves his / her head, an external force is applied to the main body part 1 from above and the human body side accordingly. Then, the part of the main body part 1 above the center line C1 bends in a direction away from the human body, but since the adhesive part 2 is connected only below the center line C1, the movement of the main body part 1 is not easily transmitted to the adhesive part 2, and the adhesive part 2 is not easily peeled off. Therefore, according to the heating element 10 of this embodiment, peeling off can be reduced even when it is attached near the movable part of the user.

[0048] When the heating element 10, which is not easily removed, is attached to the nape of the neck, the nape of the neck can be effectively heated. This relieves stiffness in the shoulders and neck, and can also alleviate pain if present.

[0049] <Modification> The above embodiment is merely one of various embodiments of the present invention. The embodiment can be modified in various ways depending on the design, etc., as long as the object of the present invention can be achieved. Modifications of the embodiment are listed below. The modifications described below can be applied in appropriate combination.

[0050] In the above embodiment, the upper end 24 of the adhesive part 2 is located below the upper apex P1 of the main body part 1, but as shown in Fig. 4(A), the upper end 24 of the adhesive part 2 may be located above the upper apex P1 of the main body part 1. In this case, for example, if the heating element 10 is attached to the vicinity of a movable part where there is no hair or the like, the problem of hair or the like adhering to the adhesive part 2 does not occur, and the adhesive area can be expanded while keeping the lateral dimension as short as possible.

[0051] In the above embodiment, the adhesive part 2 has the extension part 22, but as shown in FIG. 4(B), the extension part 22 may be omitted. Without the extension part 22, the adhesive surface area is smaller, and the adhesive part 2 is relatively more likely to peel off than in the embodiment. However, according to the heating element 10 of this modification, it can be suitably attached to any part where the movement of the movable part is small, so that the heating element 10 can be made to be less likely to peel off while reducing the burden on the skin. In this modification, the upper end 24 of the adhesive part 2 is located below the upper apex P1 of the main body 1.

[0052] In the above embodiment, the extension portion 22 protrudes upward from the adhesive part main body 21, but as shown in Fig. 4(C), the extension portion 22 may protrude laterally. In this modification, the upper end 24 of the adhesive part 2 is located below the upper apex P1 of the main body 1. In this case, when the adhesive part 2 is attached as a movable part near the nape, the adhesive part 2 can be placed as far away from the hair as possible while ensuring a large adhesive surface area.

[0053] In the above embodiment, the non-connected area and the adhesive portion 2 are separated by the notch 5, but as shown in Fig. 5, the non-connected area and the adhesive portion 2 may be separated by a slit 6. In the modified example shown in Fig. 5, a substantially triangular piece surrounded by the slit 6 and the side edge portion 15 is connected to the area R1 above the side edge portion 15, but since the area R1 and the adhesive portion 2 are separated by the slit 6, the area R1 is regarded as the non-connected area. Note that the adhesive layer 3 is not provided on the triangular piece.

[0054] In the adhesion part 2, an edge 25 facing the non-connected region is formed by the slit 6. The angle of the slit 6 with respect to the vertical direction (i.e., the angle α of the edge 25 facing the non-connected region in the adhesion part 2) is preferably 0° or more and 50° or less, and more preferably 15° or more and 45° or less. By configuring in this way, the adhesion part 2 can be made to be more resistant to peeling.

[0055] In the above embodiment or variant, the non-connection area and the adhesive portion 2 are separated by a slit 6 or a cutout portion 5, but the non-connection area and the adhesive portion 2 may also be separated by a combination of both the cutout portion 5 and the slit 6.

[0056] In the above embodiment, the adhesive portion 2 was configured by stacking the front sheet portion 11 and the back sheet portion 12, but the adhesive portion 2 does not have to be two-layered, for example, and may be configured by only one of the front sheet portion 11 and the back sheet portion 12.

[0057] In the above embodiment, the longitudinal direction of the main body 1 is defined as the lateral direction, and the lateral direction is defined as the vertical direction, but the longitudinal and lateral directions of the main body 1 may be the same length. Also, the main body 1 may be, for example, longitudinal, square, elliptical, circular, or other shapes.

[0058] In the above embodiment, one side in the vertical direction is referred to as the "lower side" and the other side is referred to as the "upper side", but it is also possible to refer to one side as the "first side" and the other side as the "second side".

[0059] In the above embodiment, the adhesive part 2 is described as being directly attached to the user's skin, but the adhesive part 2 may be attached to the user's clothing.

[0060] <Action and effect> As described above, the heating element 10 according to the first embodiment comprises a main body portion 1 in which a storage portion 18 is formed by joining the outer peripheries of a front sheet portion 11 and a back sheet portion 12, a pair of attachment portions 2 extending from each of both lateral edges of the main body portion 1 and having an adhesive layer 3 provided on one surface, and a heating material 4 stored in the storage portion 18. Of both lateral edges of the main body portion 1, a region on one side with respect to a center line C1 that passes through the vertical center of the main body portion 1 and is parallel to the horizontal direction includes a connection region between the main body portion 1 and each attachment portion 2, and a region on the other side is a non-connection region in which the main body portion 1 and each attachment portion 2 are not connected.

[0061] According to this embodiment, when the heating element 10 is disposed so that the movable part is located on the other side of the main body 1 and the adhesive part 2 is attached to the user, even if a force is applied from the movable part to the main body 1, since the adhesive part 2 is connected only on one side of the center line C1, the movement of the main body 1 is not easily transmitted to the adhesive part 2, and the adhesive part 2 is not easily peeled off. Therefore, according to the heating element 10, peeling can be reduced even when it is attached near the movable part.

[0062] In the heating element 10 according to the second embodiment, in the first embodiment, the non-connected region and the adhesive portion 2 are separated by a slit 6. According to this embodiment, with a simple structure, it is possible to make the adhesive portion 2 less likely to peel off.

[0063] In the heating element 10 according to the third aspect, in the first or second aspect, the non-connected region and the adhesive portion 2 are separated by a triangular cutout 5. According to this aspect, the portion other than the adhesive portion 2 can be cut away, so that the portion other than the adhesive portion 2 can be prevented from coming into contact with the user's skin and causing injury to the skin.

[0064] In the heating element 10 according to the fourth aspect, the angle α of the edge 25 of the adhesion part 2 facing the non-connected region with respect to the vertical direction in the second or third aspect is 15° or more and 45° or less. According to this aspect, the adhesion part 2 can be made more resistant to peeling.

[0065] In the heating element 10 according to the fifth aspect, in any one of the first to fourth aspects, the other end in the vertical direction of the adhesion part 2 is located on one side of the other end in the vertical direction of the main body part 1. According to this aspect, for example, when the heating element 10 is attached near the head where there is hair as a movable part of the user, it is possible to reduce adhesion of the adhesion part 2 to the user's hair.

[0066] In the heat generating element 10 according to the sixth aspect, in any one of the first to fifth aspects, in the vertical direction, the other end of the attachment part 2 in the vertical direction is located between the other end of the main body part 1 in the vertical direction and the center line C1. According to this aspect, for example, when the heat generating element 10 is attached near the head where there is hair as a movable part of the user, it is possible to reduce adhesion of the attachment part 2 to the user's hair while ensuring a wide adhesive area for the user.

[0067] In the heat generating element 10 according to the seventh aspect, in any one of the first to sixth aspects, the area (total area) of the adhesive layer 3 in the pair of attachment parts 2 is 15% or more of the area of ​​the main body part 1. According to this aspect, it is possible to ensure an appropriate adhesive force to the user.

[0068] In the heating element 10 according to the eighth aspect, in any one of the first to seventh aspects, the adhesive part 2 has a part of the front sheet part 11 and a part of the back sheet part 12, and the part of the front sheet part 11 and the part of the back sheet part 12 are partially joined. According to this aspect, the adhesive part 2 is more easily deformed than an adhesive part 2 in which the front sheet part 11 and the back sheet part 12 are joined over the entire surface, and for example, when it is attached to the user's skin, it can improve adhesion to the user's skin. [Explanation of symbols]

[0069] 10 Heating element 1 Main unit 11 Front sheet part 12 Back sheet part 13 Joint 15 Side edge 18 Storage unit 2 Adhesive part 24 Upper end of the adhesive part (the other end of the adhesive part in the vertical direction) 25 Edges facing non-connected areas 3 Adhesive layer 4 Heat generating materials 5 Notch 6 Slit C1 Center Line α Angle of the edge facing the non-connected area to the vertical direction

Claims

1. a main body portion having a storage portion formed by joining the outer peripheries of a front sheet portion and a back sheet portion; A pair of adhesive portions extending from both lateral edges of the main body and having an adhesive layer on one surface; A heat generating material contained in the container; Equipped with Among both lateral end edges of the main body portion, a region on one side with respect to a center line passing through the center of the main body portion in the vertical direction and parallel to the horizontal direction includes a connection region between the main body portion and each of the adhesive portions, and a region on the other side is entirely a non-connection region in which the main body portion is not connected to each of the adhesive portions. Heating element.

2. The non-connected area and the adhesive portion are separated by a slit. The heating element according to claim 1.

3. The non-connected area and the adhesive portion are separated by a triangular cutout. The heating element according to claim 1.

4. An angle between an edge of the adhesive portion facing the non-connected region and a longitudinal direction is 15° or more and 45° or less. The heating element according to claim 2 or 3.

5. the other end of the adhesive portion in the longitudinal direction is located on the one side of the other end of the main body portion in the longitudinal direction; The heating element according to any one of claims 1 to 3.

6. In the vertical direction, the end portion on the other side in the vertical direction of the adhesive portion is located between the end portion on the other side in the vertical direction of the main body portion and the center line. The heating element according to claim 5.

7. The area of ​​the adhesive layer in the pair of attachment portions is 15% or more of the area of ​​the main body portion. The heating element according to any one of claims 1 to 3.

8. the attachment portion includes a portion of the front sheet portion and a portion of the back sheet portion, A portion of the front sheet portion and a portion of the back sheet portion are partially joined together. The heating element according to any one of claims 1 to 3.

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