Steam heating equipment

Abstract

To provide a steam heating tool having a structure in which while the skin of a living body is sufficiently and suitably pressed by protrusion parts, the steam heating tool is made to stably generate heat.SOLUTION: A steam heating tool 100 comprises a breathable sheet 10 comprising two or more protrusion parts 71 curved convexly on the side of one surface 10a, and extending parts 76 curved at a lower height than that of the protrusion parts 71 convexly on the side of the one surface 10a and extending laterally from side surfaces of the protrusion parts 71, and made of nonwoven fabric; and a heat generating body 30 including oxidizable metal powder and water, and packed in internal spaces 75 of the protrusion parts 71 and internal spaces 79 of the extending parts 76.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The present invention relates to a steam warming device. [Background technology]

[0002] Patent Document 1 also describes a sheet-like steam warming device. This steam warming device has multiple protruding portions on one side, a breathable sheet, and a heat-generating material that contains oxidizable metal powder and water and is filled into the protruding portions, and is configured so that heat is generated from the heat-generating material when oxygen is supplied to the heat-generating material through the breathable sheet. Patent Document 2 describes a wearing device that is worn on the human body, such as on the shoulders or waist. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2018-175857 [Patent Document 2] Japanese Patent Application Laid-Open No. 2007-54329 Summary of the Invention [Problem to be solved by the invention]

[0004] There is a need for a steam warming device such as that shown in Patent Document 1 that can be attached to the human body using a fitting such as that shown in Patent Document 2, so that the protrusions are pressed against the skin with a strong force while maintaining a moderate degree of penetration of the protrusions into the skin and allowing the steam warming device to generate heat stably. However, when a fitting such as that shown in Patent Document 2 is used over the steam warming device of Patent Document 1, oxygen inflow is hindered and heat generation is unstable. Furthermore, it has been found that there are problems such as the possibility that the strong force may cause excessive penetration into the skin, and that the penetrating tip may become too hot over time, causing low-temperature burns to the skin.

[0005] The present invention relates to a steam warming device having a structure that allows the steam warming device to generate heat stably while applying sufficient and moderate pressure to the skin of a living body with protrusions. [Means for solving the problem]

[0006] The present invention relates to a steam heating device having a breathable sheet made of nonwoven fabric, which has two or more protrusions that are curved convexly on one side, and an extension that is curved convexly on said one side at a height lower than the protrusions and extends laterally from the side of the protrusions, and a heat-generating material that contains oxidizable metal powder and water and is filled in the internal space of the protrusions and the internal space of the extensions. [Effects of the Invention]

[0007] According to the present invention, it is possible to make the steam heating device generate heat stably while the protrusions apply sufficient and appropriate pressure to the skin of the living body. [Brief explanation of the drawings]

[0008] [Figure 1] FIG. 1 is a perspective view of a steam warming device according to an embodiment. [Figure 2] FIG. 1 is a plan view of a steam warming device according to an embodiment. [Figure 3] Figures 3(a), 3(b) and 3(c) are schematic cross-sectional views of the steam heating device according to the embodiment, of which Figure 3(a) is a cross-sectional view taken along line AA shown in Figure 2, Figure 3(b) is a cross-sectional view taken along line BB shown in Figure 2, and Figure 3(c) is a cross-sectional view taken along line CC shown in Figure 2. [Figure 4] FIG. 4 is an enlarged cross-sectional view of part A shown in FIG. [Figure 5] FIG. 3(c) is an enlarged cross-sectional view of part B shown in FIG. [Figure 6] FIG. 2 is a schematic diagram showing an example of a state in which the steam warming device according to the embodiment is used. [Figure 7]Figures 7(a), 7(b) and 7(c) are perspective views of steam warming devices according to each modified example of the embodiment, with Figure 7(a) showing Modification 1, Figure 7(b) showing Modification 2 and Figure 7(c) showing Modification 3. DETAILED DESCRIPTION OF THE INVENTION

[0009] Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. In all the drawings, the same components are designated by the same reference numerals, and redundant explanations will be omitted where appropriate.

[0010] As shown in Figures 1 to 5, the steam heating device 100 has two or more protrusions 71 that are curved convexly toward one surface 10a, and extensions 76 that are curved convexly toward one surface 10a at a height lower than the protrusions 71 and extend laterally from the side of the protrusions 71, and is made of a breathable sheet 10 made of nonwoven fabric, and a heat-generating material 30 (Figure 4, etc.) that contains oxidizable metal powder and water and is filled in the internal space 75 of the protrusions 71 and the internal space 79 of the extensions 76.

[0011] The steam warming device 100 is configured so that oxygen is supplied to the heat generating material 30 through the breathable sheet 10, causing the heat generating material 30 to generate heat. By attaching the steam heating device 100 to a living body such as a human body with the protrusions 71 pressed against the skin 91, the protrusions 71 press against the skin 91, thereby allowing the areas of the skin 91 corresponding to the protrusions 71 to be sufficiently locally heated. As a result, for example, by applying pressure from the protrusions 71 and stimulating the fascia below the skin 91 with the heat of the heat-generating material 30, it is possible to stimulate meridians and acupuncture points with pressure and heat, as in acupuncture and moxibustion. Furthermore, as the exothermic reaction of the heat-generating material 30 progresses, it hardens (oxidizes), and the exothermic reaction slows down. The steam heating device 100 is used, for example, from the start of the exothermic reaction of the heat-generating material 30 until the exothermic reaction slows down or ends.

[0012] According to this embodiment, in addition to the protrusion 71 and the heat generating material 30, the steam heating device 100 has an extension 76 that is curved convexly on one surface 10a at a height lower than the protrusion 71 and extends from the side of the protrusion 71. As a result, when protrusion 71 presses against skin 91 of a living body, the top of extension 76 abuts against skin 91, thereby preventing the portion of protrusion 71 below the top of extension 76 from digging into skin 91 (see FIG. 6). Therefore, even if protrusion 71 is pressed against skin 91 with a strong force, extension 76 prevents the entire protrusion 71 from digging into skin 91, and the degree to which protrusion 71 digs into skin 91 can be kept within an appropriate range. Furthermore, extension 76 allows a portion of protrusion 71 to remain exposed from skin 91, so that oxygen can be continuously supplied to heat generating material 30 within protrusion 71, enabling stable heat generation. As described above, according to this embodiment, the protrusions 71 can apply sufficient and appropriate pressure to the skin 91 of the living body, while the steam heating device 100 can generate heat stably.

[0013] Before use, the steam warming device 100 is sealed and stored in a packaging material (not shown). When the packaging material is opened and the steam warming device 100 is taken out of the packaging material, oxygen contained in the outside air is supplied to the heat generating material 30, causing the heat generating material 30 to generate heat. Furthermore, the part of the living body to which the steam heating device 100 is attached is not particularly limited, but in this embodiment, the steam heating device 100 can be attached to, for example, the torso such as the shoulders, back and waist, the arms such as the wrists, and the legs such as the soles of the feet.

[0014] The steam warming device 100 is configured, for example, to include the sheet 10 and the heat generating material 30, as well as a second sheet 20 (FIG. 4) laminated on the other surface 10b of the sheet 10. In the following explanation, the protruding direction of the protrusions 71 of the steam warming device 100 (upward in Fig. 4) may be referred to as the front side, and the opposite direction to the protruding direction of the protrusions 71 (downward in Fig. 4) may be referred to as the rear side. The front side of the steam warming device 100 is the side that faces the skin 91 when the steam warming device 100 is attached to a living body. The direction perpendicular to the thickness direction of the steam warming device 100 (the left-right direction in Fig. 4) may be referred to as the horizontal direction. The side is a direction that includes a horizontal component, and the side of the protrusion 71 is a surface that faces a direction that includes a horizontal component, but does not face a direction that includes a component toward the center of the protrusion 71 in a plan view.

[0015] The planar shape of the steam warming device 100 is not particularly limited, but for example, it can be a rectangle (for example, a square) with four chamfered corners as shown in Figure 2. However, the planar shape of the steam warming device 100 may be any other shape, such as a polygon other than a rectangle, a circle, or an ellipse.

[0016] The sheet 10 has a flat sheet-like base 11. In the present embodiment, each of the multiple protrusions 71 and extensions 76 is curved convexly toward one surface 10a of the sheet 10 with the base 11 as a reference. The sheet 10 constitutes the outer surface on the front side of the steam warming device 100. For example, the steam warming device 100 is used with the sheet 10 (particularly the protrusions 71) in direct contact with the skin 91 of the living body.

[0017] In this embodiment, the sheet 10 is composed of, for example, a nonwoven fabric sheet 15 (first nonwoven fabric sheet) that constitutes one of the outermost layers of the sheet 10, a nonwoven fabric sheet 17 (second nonwoven fabric sheet) that constitutes the other outermost layer of the sheet 10, and a breathable sheet 16 that constitutes an intermediate layer located between the first nonwoven fabric sheet and the second nonwoven fabric sheet. More specifically, in this embodiment, the sheet 10 has a three-layer structure of a nonwoven fabric sheet 15, a breathable sheet 16, and a nonwoven fabric sheet 17, as shown in FIGS. However, the present invention is not limited to this example, and the sheet 10 may be configured to include three other layers: the nonwoven fabric sheet 15, the breathable sheet 16, and the nonwoven fabric sheet 17. Furthermore, the sheet 10 may be configured, for example, with a single nonwoven fabric sheet, without including the second nonwoven fabric sheet and the breathable sheet 16. These sheets may have a single structure consisting of only one sheet material, whether single-layer or multi-layer, or may have a laminated structure consisting of two or more types of sheet materials superimposed on top of each other.

[0018] The second sheet 20 constitutes, for example, the outer surface of the rear side of the steam warming device 100. The sheet 10 and the second sheet 20 are formed, for example, in the same planar shape, and are superimposed on each other with their outer contours aligned, and their peripheral edges are joined together. As a result, the heat generating material 30 is held between the second sheet 20 and the inner circumferential surfaces of the protrusions 71 and the extensions 76 of the sheet 10 .

[0019] Of the sheet 10 and second sheet 20 that form the front and rear outer surfaces of the steam warming device 100, for example, the sheet 10 has breathability and the breathability of the sheet 10 is higher than that of the second sheet 20. More specifically, as described above, the sheet 10 is also breathable at the protrusions 71 and the extensions 76, and can supply oxygen to the heat generating material 30 through the protrusions 71 and the extensions 76, and can also release water vapor through the protrusions 71 and the extensions 76. More specifically, in this embodiment, the second sheet 20 is, for example, a non-breathable sheet that does not allow substantial air to pass through.

[0020] In this embodiment, the heat generating material 30 is composed of, for example, an oxidizable metal, a reaction accelerator such as a carbon material such as activated carbon that acts as a catalyst for the oxidation reaction, and water, and preferably an electrolyte such as a metal salt. The heat generating material 30 generates heat by reacting with oxygen in the air, and heated steam is generated as the heat is generated. In other words, the heat generating material 30 has the function of generating steam as the heat is generated. Since steam is generated as heat is generated, it is even better if a water retention agent is contained within the heat generating material 30. By including a water retention agent in the heat generating material 30, the water retention agent retains excess water in the heat generating material 30. Therefore, when the steam warming device 100 is removed from the packaging, an oxidation reaction proceeds quickly, causing the heat generating material 30 to generate heat, and the water retained in the water retention agent to turn into steam, which can be released over a long period of time.

[0021] Furthermore, the heat generating material 30 does not have to be configured to contain a water retention agent, in which case the steam warming device 100 comprises, for example, a water-absorbing sheet (not shown) placed between the sheet 10 and the second sheet 20. By incorporating water and a water-retaining agent into this water-absorbing sheet, the heat generated by the heat generating material 30 turns the water in the water-absorbing sheet into steam, which can be released over a long period of time. Furthermore, the heat generating material 30 may contain a water retention agent and may be provided with a water absorbing sheet disposed between the sheet 10 and the second sheet 20. The heat generating material 30 may also contain iron and carbon components. The iron referred to here may be at least a part of the oxidizable metal, or may be separate from the oxidizable metal. The iron referred to here is oxidizable iron. The carbon material referred to here may be at least a part of the reaction accelerator. Moreover, as various materials constituting the heat generating material 30, for example, materials described in Japanese Patent Application Laid-Open Nos. 2003-102761 and 2006-340928 can also be used.

[0022] In the steam heating device 100, the internal space 75 of the protrusion 71 and the internal space 79 of the extension 76 are filled with the heat generating material 30, and the heat generating material 30 may also be filled between the sheet 10 and the second sheet 20 in the area corresponding to the base 11. However, even in this case, it is preferable that the thickness of the heat generating material 30 in the areas corresponding to the protrusions 71 and extensions 76 of the sheet 10 is greater than the thickness of the heat generating material 30 in the area corresponding to the base 11. In this embodiment, the heat generating material 30 is filled in the areas of the sheet 10 corresponding to the protrusions 71 and the extensions 76, whereas the heat generating material 30 is substantially absent in the areas corresponding to the base 11.

[0023] More specifically, in this embodiment, the heat generating material 30 fills, for example, 70% or more of the area in the height direction of the internal space 75 of the protrusion 71. That is, as shown in Fig. 4, the height dimension of the area in the internal space 75 filled with the heat generating material 30 is 0.7 times or more the height dimension H3 of the internal space 75. This allows the protrusions 71 to be heated more sufficiently, and the protrusions 71 to sufficiently warm the skin of the living body. Furthermore, the heat generating material 30 fills, for example, 70% or more of the area in the height direction of the internal space 79 of the extension portion 76. That is, as shown in Fig. 5, the height dimension of the area in the internal space 79 filled with the heat generating material 30 is 0.7 times or more the height dimension H4 of the internal space 79. This allows oxygen to be efficiently supplied to the heat generating material 30 in the protruding portion 71 via the extending portion 76, as will be described later.

[0024] The filling rate of the heat-generating material 30 in the height direction of the internal spaces 75, 79 is measured using, for example, a laser microscope or laser displacement meter capable of measuring height differences. The laser displacement meter may be a one-dimensional spot type, a two-dimensional laser displacement meter, or a three-dimensional laser displacement meter. An appropriate laser displacement meter is selected based on the required measurement distance and laser light spot distance according to the shape and height dimensions of the protrusion 71 and the extension 76. For example, a sensor head IL-300 (measurement distance 160 mm to 450 mm, spot diameter φ500 μm) manufactured by Keyence Corporation may be used.

[0025] 3(a), 3(b), and 3(c), the shape of the protrusion 71 is not particularly limited, but may be tapered toward the upper end, for example. However, it is preferable that the top of the protrusion 71 has a rounded shape. The shape of the protrusion 71 may be, for example, a cone shape such as a circular cone, an elliptical cone, or an oblong cone, or a frustum shape such as a circular truncated cone, an elliptical truncated cone, or an oblong truncated cone. In this embodiment, the protrusion 71 is formed in a conical shape. 3(a), 3(b) and 3(c) show a cross section of the steam warming device 100 in a schematic manner.

[0026] 3(a), 3(b), and 3(c), the shape of the extension 76 is not particularly limited, but may be tapered toward the upper end, for example. However, it is preferable that the top of the extension 76 has a rounded shape. In this embodiment, the extending portion 76 is formed into a triangular prism shape with its axial direction being the extension direction of the extending portion 76. The top of the extending portion 76 has a ridge line that is long in one direction. The height dimension H2 of the extending portion 76 (see FIG. 3(c)) is substantially constant regardless of the position of the extending portion 76 in the extension direction. However, the shape of the extension 76 may be, for example, a polygonal prism other than a triangular prism.

[0027] Here, in this embodiment, the extension portion 76 connects adjacent protrusion portions 71 to each other, and the internal spaces 75 of the multiple protrusion portions 71 connected via the extension portion 76 and the internal space 79 of the extension portion 76 are interconnected. As a result, oxygen introduced into the internal space 79 of the extension portion 76 is also introduced into the internal space 75 of the protrusion portion 71 connected to the extension portion 76. In other words, when the protrusion portion 71 is embedded in the skin 91 of the living body, the extension portion 76 serves as an oxygen inlet for the protrusion portion 71, enabling the heat-generating material 30 within the protrusion portion 71 to generate heat more sustainably and stably. However, in the present invention, the protrusion 71 and the extension 76 may be formed independently of each other, for example.

[0028] More specifically, as shown in Figures 1 and 2, the arrangement of the multiple protrusions 71 is not particularly limited, but can be, for example, a planar lattice arrangement such as a square lattice arrangement, a diagonal lattice arrangement, a parallelepiped lattice arrangement, a hexagonal lattice arrangement, a rectangular lattice arrangement, or a houndstooth lattice arrangement. In this embodiment, for example, as shown in Fig. 2, the sheet 10 has five protrusions 71 arranged in a square lattice pattern in a plan view. More specifically, one protrusion 71a is arranged in the center of the sheet 10, and the remaining four protrusions 71b are arranged around the protrusion 71a. These four protrusions 71b are arranged at the four corners of the sheet 10, respectively. The seat 10 has four extension portions 76 arranged in a generally crisscross shape in a plan view. More specifically, each extension portion 76 extends linearly from a protrusion 71a located in the center of the seat 10 toward each of the protrusions 71b surrounding the protrusion 71a. One end of each extension portion 76 in the extension direction is connected to a lower portion 72 of the protrusion 71a, and the other end of each extension portion 76 in the extension direction is connected to a lower portion 72 of each of the protrusions 71b. In this way, each extension portion 76 interconnects an internal space 75 of the centrally located protrusion 71a and an internal space 79 of each of the protrusions 71b located around the protrusion 71a. The upper edge of each extension 76 extends parallel to one surface 10a. The height position of the lower edge of each extension portion 76 is set to the same height position as the height position of the lower edge of each protrusion portion 71.

[0029] In this embodiment, it is preferable that the air permeability of the lower portion 72 of the protrusion 71 is lower than the air permeability of the upper portion 73 of the protrusion 71. Note that the air permeability here is a value measured according to JIS P8117, and is defined as the time it takes for a certain amount of air to pass through a certain area under a certain pressure. Therefore, the lower the air permeability, the better the breathability (the easier air flows). By doing this, when the steam heating device 100 is in use, the heat-generating material 30 in the lower part 72 hardens before the heat-generating material 30 in the upper part 73, thereby preventing hardening and excessive temperature rise in the upper part 73 of the protrusion 71, which is the part that mainly comes into contact with the skin 91. Here, the lower part 72 of the protrusion 71 means the lower part on the side surface of the protrusion 71, and the upper part 73 of the protrusion 71 means the upper part on the side surface of the protrusion 71. Similarly, in the following description, the lower part 77 of the extension 76 means the lower part on the side surface of the extension 76, and the upper part 78 of the extension 76 means the upper part on the side surface of the extension 76. More specifically, in this embodiment, the lower part 72 of the protrusion 71 is the part on the other surface 10b side, and the upper part 73 of the protrusion 71 is the part on the one surface 10a side, based on the upper edge of the extension 76. As another example, when the extension portion 76 is divided into two in the height direction of the extension portion 76 , the lower portion is a lower portion 77 of the extension portion 76 and the upper portion is an upper portion 78 of the extension portion 76 .

[0030] In this embodiment, it is preferable that the air permeability of the lower portion 72 of the protruding portion 71 is lower than the air permeability of the lower portion 77 of the extending portion . With this configuration, the amount of oxygen supplied from the lower part 72 to the upper part 73 of the protrusions 71 can be appropriately controlled, so that the exothermic reaction of the heat-generating material 30 can be more reliably slowed down before the upper part 73 of the protrusions 71 hardens or an excessive temperature rise occurs. In other words, during use of the steam heating device 100, the upper part 73 of the protrusions 71, which is the part that mainly comes into contact with the skin 91, can be prevented from hardening or an excessive temperature rise.

[0031] In this embodiment, it is preferable that the air permeability of the lower portion 77 of the extension portion 76 is lower than the air permeability of the upper portion 73 of the protrusion portion 71 . With this configuration, the heat-generating material 30 in the lower part 77 of the extending part 76 hardens before the heat-generating material 30 in the upper part 73 of the protruding part 71, and this attenuates or terminates the supply of oxygen into the upper part 73 via the lower part 77 of the extending part 76. This more reliably slows down the heat-generating reaction of the heat-generating material 30 before hardening or an excessive temperature rise occurs in the upper part 73 of the protruding part 71. In other words, during use of the steam heating device 100, hardening or an excessive temperature rise in the upper part 73 of the protruding part 71, which is the part that mainly comes into contact with the skin 91, can be prevented. In this embodiment, it is preferable that the air permeability of the upper portion 78 of the extension portion 76 is lower than the air permeability of the upper portion 73 of the protrusion portion 71 . With this configuration, the exothermic reaction of the exothermic material 30 can be more reliably slowed down before the upper portion 73 of the protrusion 71 hardens or an excessive temperature rise occurs.

[0032] More specifically, the steam warming device 100 is configured so that the air permeability of the upper part 78 of the extending part 76 and the upper part 73 of the protruding part 71 is higher than the air permeability of the lower part 72 of the protruding part 71 and the lower part 77 of the extending part 76. Preferably, in the protruding part 71 and the extending part 76, the air permeability of the lower part 72 of the protruding part 71 is the lowest, and the air permeability of the upper part 73 of the protruding part 71 is the highest. By doing this, hardening and excessive temperature rise of the upper part 73 of the protrusion 71 and the upper part 78 of the extension 76, which are the parts that mainly come into contact with the skin 91, can be suppressed, and oxygen can be continuously supplied to the heat generating material 30 within the protrusion 71 via the extension 76, allowing for stable heat generation. In the present invention, the air permeability of the extension portion 76 may be set to be approximately equal to the air permeability of the lower portion 72 of the protrusion portion 71, for example.

[0033] Furthermore, in this embodiment, it is preferable that the ratio of the height of the extension portion 76 to the height of the protrusion portion 71 is 0.05 or more and 1.0 or less. With this configuration, the upper portion 73 of the protrusion 71 is mainly used to sufficiently press the skin 91 of the living body, while the extension portion 76 allows the protrusion 71 to bite into the skin 91 of the living body within an appropriate range. Furthermore, since an appropriate amount of oxygen can be introduced into the heat generating material 30, the time required for the heat generating material 30 to generate sufficient heat, the heat generation duration, the heat generation temperature, the hardening speed, etc. can be set within the desired range. More specifically, for example, it is more preferable that the ratio of the height of the extension portion 76 to the height of the protrusion portion 71 is 0.1 or more and 0.8 or less, even more preferably 0.2 or more and 0.6 or less, and even more preferably 0.3 or more and 0.4 or less.

[0034] In this embodiment, the ratio of the surface area of ​​the extension portion 76 to the combined surface area of ​​the protrusion 71 and the extension portion 76 is preferably 0.05 or more and 0.7 or less. With this configuration, an appropriate amount of oxygen can be introduced into the heat generating material 30, so that the time required for the heat generating material 30 to generate sufficient heat, the heat generation duration, the heat generation temperature, the hardening speed, etc. can be set within the desired range. More specifically, for example, it is more preferable that the ratio of the surface area of ​​the extension portion 76 to the combined surface area of ​​the protrusion portion 71 and the extension portion 76 is 0.10 or more and 0.6 or less, even more preferably 0.15 or more and 0.4 or less, and even more preferably 0.2 or more and 0.3 or less.

[0035] When the steam warming device 100 is worn on the shoulder of a human body, the total surface area of ​​the protrusion 71 and the extension 76 is, for example, 50 mm 2 Over 8000mm 2 Preferably, it is less than 200 mm2 Over 4000mm 2 It is more preferable that it is less than 400 mm 2 Over 1600mm 2 Similarly, the surface area of ​​the extension 76 is preferably 5 mm or less. 2 More than 2500mm 2 Preferably, it is less than 30 mm 2 Over 1500mm 2 It is more preferable that it is less than 100 mm 2 Over 600mm 2 It is more preferable that: When the steam warming device 100 is worn on the waist of a human body, the total surface area of ​​the protrusion 71 and the extension 76 is, for example, 100 mm 2 More than 10,000 mm 2 Preferably, it is less than 300 mm 2 More than 5000mm 2 It is more preferable that it is less than 500 mm 2 More than 2500mm 2 Similarly, the surface area of ​​the extension 76 is preferably 5 mm or less. 2 More than 5000mm 2 Preferably, it is less than 30 mm 2 More than 2500mm 2 It is more preferable that it is less than 100 mm 2 Over 1200mm 2 It is more preferable that:

[0036] The heat generating performance of the heat generating material 30 is preferably set so that the temperature of the skin surface is between 37°C and 44°C, and more preferably between 38°C and 42°C.

[0037] When the steam warming device 100 is worn on the shoulder of the human body, an example of the preferred dimensions of the protrusion 71 and the extension 76 is as follows. The height dimension H1 (Figure 3(a)) of the protrusion 71 is not particularly limited, but is preferably, for example, 2 mm or more and 15 mm or less, more preferably 3 mm or more and 10 mm or less, and even more preferably 5 mm or more and 8 mm or less. The diameter of the protrusion 71 is not particularly limited, but is preferably, for example, 2 mm or more and 38 mm or less, more preferably 5 mm or more and 20 mm or less, and even more preferably 7 mm or more and 12 mm or less. Similarly, the height dimension H2 (Figure 3(c)) of the extension portion 76 is not particularly limited, but is preferably, for example, 0.5 mm or more and 7.5 mm or less, more preferably 1 mm or more and 5 mm or less, and even more preferably 2 mm or more and 3 mm or less. The length L1 (FIG. 2) of the extension 76 is preferably no more than twice the height H1 of the protrusion 71, and more preferably no more than 1.5 times the height H1. By doing so, the protrusion 71 does not feel hot or painful against the skin 91 of the living body, and the protrusion 71 can be made to dig into the skin 91 while appropriately stimulating the acupressure points. Furthermore, the flow of oxygen into the heat-generating material 30 is not impeded, and the heat-generating material 30 generates heat well. The width W1 (FIG. 2) of the extension 76 is not particularly limited, but is preferably equal to or smaller than the diameter of the protrusion 71, and more preferably equal to or smaller than ¾ of the diameter. By doing so, an appropriate amount of oxygen can be supplied to the protrusion 71 via the extension 76.

[0038] When the steam warming device 100 is worn on the waist of the human body, an example of the preferred dimensions of the protrusion 71 and the extension 76 is as follows. The height dimension H1 (Figure 3(a)) of the protrusion 71 is not particularly limited, but is preferably, for example, 3 mm or more and 15 mm or less, more preferably 4 mm or more and 12 mm or less, and even more preferably 6 mm or more and 9 mm or less. The diameter of the protrusion 71 is not particularly limited, but is preferably, for example, 3 mm or more and 38 mm or less, more preferably 5 mm or more and 20 mm or less, and even more preferably 8 mm or more and 15 mm or less. Similarly, the height dimension H2 (Figure 3(c)) of the extension portion 76 is not particularly limited, but is preferably, for example, 0.4 mm or more and 9 mm or less, more preferably 1 mm or more and 6 mm or less, and even more preferably 2 mm or more and 3.5 mm or less. The length dimension L1 (FIG. 2) of the extension 76 is not particularly limited, but is preferably 3.0 times or less, more preferably 2.0 times or less, and even more preferably 1.5 times or less, the height dimension H1 of the protrusion 71. By setting the length within this range, the protrusion 71 does not feel hot or painful to the skin of the living body, and the protrusion 71 can dig into the skin 91 while appropriately stimulating the acupressure points. Furthermore, the flow of oxygen into the heat-generating material 30 is not hindered, allowing the heat-generating material 30 to generate heat effectively. The width W1 (FIG. 2) of the extension 76 is not particularly limited, but is preferably equal to or smaller than the diameter of the protrusion 71, and more preferably equal to or smaller than ¾ of the diameter. By doing so, an appropriate amount of oxygen can be supplied to the protrusion 71 via the extension 76.

[0039] As described above, it is preferable that the top of the protrusion 71 and the top of the extension 76 each have a rounded shape. Furthermore, it is preferable that the curvature of the top of the protrusion 71 is smaller than the curvature of the top of the extension 76. The radius of curvature of the top of the protrusion 71 is, for example, preferably 0.5 mm or more and 3.0 mm or less, and more preferably 0.8 mm or more and 1.5 mm or less. The radius of curvature of the top of the protrusion 71 is, for example, preferably 0.5 mm or more and 2.5 mm or less, and more preferably 0.8 mm or more and 1 mm or less. By doing so, the protrusions 71 can apply sufficient and appropriate pressure to the skin 91 of the living body. The top of the protrusion 71 here means the upper end of the upper portion 73 of the protrusion 71, and the top of the extension 76 means the upper end of the upper portion 78 of the extension 76.

[0040] Here, the present invention may include a steam heating device kit that includes, for example, an attachment part 114 for attaching the steam heating device 100 to a living body with the protrusions 71 pressed against the skin 91. With this configuration, the steam warming device 100 can be attached to a living body, and the attachment part 114 allows the protrusions 71 to be continuously pressed against the skin 91. In this case, the portion of the steam warming device 100 that includes the sheet 10 and the second sheet 20 becomes the main body.

[0041] More specifically, when using the steam heating device 100, as shown in Figure 6, for example, the steam heating device 100 is sandwiched between the attachment part 114 and the skin 91, so that the protrusion part 71 is pressed against the skin 91. In this state, mainly upper portion 73 of protrusion 71 digs into skin 91, while lower portion 72 of protrusion 71 is exposed from skin 91. In addition, the top of extension 76 abuts against skin 91, preventing protrusion 71 from digging further into skin 91. However, extension 76 may be spaced apart from skin 91, for example.

[0042] In the present invention, the method of attaching the steam warming device 100 to the attachment part 114 is not particularly limited, and for example, the attachment part 114 may be provided with a storage part (not shown) for storing the steam warming device 100, or the steam warming device 100 may be configured to be clamped between the attachment part 114 and the skin 91 by the elastic restoring force of the attachment part 114. In addition, for example, an adhesive layer (not shown) may be formed on the rear side of the steam warming device 100, and the steam warming device 100 may be attached to the attachment part 114 by sticking the adhesive layer to the inner surface of the attachment part 114.

[0043] The attachment part 114 is not particularly limited, but examples thereof include supports attached to the shoulders, arms, and legs, and corsets attached to the waist.

[0044] In this embodiment, the pressure applied by the attachment part 114 to bring the steam warming device 100 into contact with the skin 91 is 50 kPa or more and 2000 kPa or less. By pressing the steam warming device 100 against the skin 91 with such strength, it is possible to achieve a sufficient pressing effect on the fascia of the shoulders and waist of the human body, for example. Furthermore, as described above, according to the steam warming device 100 of this embodiment, the extension parts 76 allow the protrusions 71 to dig into the skin 91 within an appropriate range, so that the protrusions 71 can apply sufficient and appropriate pressure to the skin 91 of the living body, and the steam warming device 100 can generate heat stably. The magnitude of the pressure here is a value measured using a pressure measurement film, Prescale Ultra-Low Pressure LLW (manufactured by Fujifilm Corporation).

[0045] The attachment part 114 may have, for example, an attachment surface that is attached to the living body, and the steam warming device 100 may be provided on the attachment surface so that the protrusions 71 are convex toward the living body. In this case, when the attachment part 114 is attached to the living body, the attachment surface of the attachment part 114 applies a pressing force of 1 kPa or more and 10 kPa or less to the living body. In other words, the present invention may include a steam heating device kit comprising a steam heating device 100 and an attachment part 114 having an attachment surface to be attached to a living body, and which, when attached to the living body, causes the attachment surface to apply a pressing force of 1 kPa or more and 10 kPa or less to the living body, and in which the steam heating device is arranged on the attachment surface so that the protrusion 71 is convex toward the living body. With this configuration, the protrusions 71 can apply sufficient and appropriate pressure to the skin 91 of the living body, and the steam warming device 100 can generate heat stably. The magnitude of the pressure here is a value measured using an air pack type sensor and a contact pressure measuring device AMI3037-10 (manufactured by AMI Techno Co., Ltd.).

[0046] In the present invention, the attachment part 114 of the steam warming device 100 is a pair of attachment bands, and may be configured to include, for example, an adhesive sheet part that is adhesively fixed to the skin 91. In this case, by adhesively fixing the adhesive sheet part to the skin 91 while tension is applied to the attachment part, the protrusions 71 can be pressed against the skin 91, allowing the steam warming device 100 to be attached to the living body. In the present invention, the steam warming device 100 may be wrapped around the leg or arm using a band such as a bandage, and the protrusions 71 may be pressed against the skin 91. In addition, in the present invention, the wearing part 114 may be in the form of an eye mask having a pair of ear hooks that can be hung on the ears of the user. In the present invention, the steam warming device 100 may be used in combination with a wearing tool (not shown) that is provided separately from the steam warming device 100 .

[0047] Furthermore, it is preferable that the protrusions 71 and extensions 76 filled with the heat generating material 30 do not substantially undergo plastic deformation even when a pressure of 1 kPa is applied in the direction perpendicular to the surface of the sheet 10 having the protrusions 71 and extensions 76, and it is preferable that they do not deform even when a pressure of 5 kPa or more is applied. By doing so, the protrusion 71 can apply sufficient pressure to the skin of the living body, and the extension 76 can suppress the degree to which the protrusion 71 digs into the skin 91 of the living body, thereby keeping it within a moderate range. The number of protrusions 71 and extensions 76 that the sheet 10 has is not particularly limited, but two or more protrusions 71 are required to form an extension 76 .

[0048] Examples of materials and properties of each part of the steam warming device 100 will be described in more detail below.

[0049] An oxidizable metal that is commonly used as a material for this type of heat generating material can be used as the oxidizable metal in the heat generating material 30. From the viewpoints of handling, formability, etc., it is preferable to use this oxidizable metal in the form of powder or fiber.

[0050] Examples of oxidizable metals in powder form include iron powder, aluminum powder, zinc powder, manganese powder, magnesium powder, calcium powder, etc., and among these, iron powder is preferably used from the viewpoints of handling and production costs. As an oxidizable metal in the form of a powder, it is preferable to use one having a particle size (hereinafter, "particle size" refers to the maximum length in the powder form or the average particle size measured by dynamic light scattering, laser diffraction, or the like) of 0.1 μm or more and 300 μm or less, because this allows for good reaction control, and it is more preferable to use one containing 50 mass % or more particles having a particle size of 0.1 μm or more and 150 μm or less.

[0051] Examples of oxidizable metals having a fibrous form include steel fibers, aluminum fibers, magnesium fibers, etc. Among these, steel fibers, aluminum fibers, etc. are preferably used from the viewpoints of handling ease and production costs. From the viewpoints of heat generation performance, etc., it is preferable to use oxidizable metals having a fiber length of 0.1 mm or more and 50 mm or less and a thickness of 1 μm or more and 1000 μm or less.

[0052] The content of the oxidizable metal in the heat generating material 30 is preferably 30% by mass or more and 80% by mass or less, and more preferably 40% by mass or more and 70% by mass or less. By setting this content to 30% by mass or more, the heat generation temperature of the protrusions 71 filled with the heat generating material 30 can be raised sufficiently to a level where a person feels hot when touched with a fingertip, etc., which is preferable. By setting this content to 80% by mass or less, the heat generating material 30 has sufficient breathability, and as a result, the reaction occurs sufficiently all the way to the center of the heat generating material 30, making it possible to sufficiently increase the heat generation temperature of the heat generating material 30. Furthermore, the heat generation time of the heat generating material 30 can be made sufficiently long, and the moisture supply by the water retention agent can also be made sufficient. Here, the content of the oxidizable metal in the heat generating material 30 can be measured by an ash content test in accordance with JIS P8128, or if the oxidizable metal is iron, it can be measured by a vibrating sample magnetization measurement test or the like, taking advantage of the property that magnetization occurs when an external magnetic field is applied.

[0053] The carbon material in the heat generating material 30 functions as a reaction accelerator to accelerate the oxidation reaction, and specifically, can have one or more of the functions of an oxygen-retaining / supplying material and a catalytic function for the oxidizable metal. The carbon material also functions as a water-retaining agent, as described below. Examples of such carbon materials include activated carbon such as coconut shell charcoal, charcoal powder, bicarbonate, peat, and lignite, carbon black, acetylene black, and graphite powder. These may be used alone or in combination. Among these, activated carbon powder is preferably used as the carbon material powder because it has a good balance between oxygen supply ability and catalytic ability.

[0054] The water retention agent in the heat generating material 30 may be a water retention agent that is commonly used as a material for this type of heat generating material. This water retention agent functions as a moisture retention agent. In addition, this water retention agent may also function as a supplier that retains oxygen supplied to the oxidizable metal and supplies the oxygen to the oxidizable metal. As the water-retaining agent, for example, an inorganic material is preferably used. As the water-retaining agent, for example, a water-absorbent polymer 40 or a porous material is preferably used. In this embodiment, it is preferable that the water-absorbing polymer 40 is contained.

[0055] Examples of water retention agents other than the water-absorbing polymer 40 include activated carbon (coconut shell charcoal, charcoal powder, bicarbonate coal, peat, lignite), carbon black, acetylene black, graphite, zeolite, perlite, vermiculite, silica, cancrinite, fluorite, etc. The form of this water retention agent is not particularly limited, but in order to form an effective contact state with the oxidizable metal, it is preferable to use a powder with a particle size of 0.1 μm or more and 500 μm or less, and it is more preferable to contain 50 mass% or more of powder with a particle size of 0.1 μm or more and 200 μm or less.

[0056] The total content of activated carbon and water retention agent (excluding water-absorbent polymer 40) in heat generating material 30 is preferably 1% by mass to 50% by mass, more preferably 2% by mass to 40% by mass. By setting this content to 1% by mass or more, the moisture necessary to sustain the oxidation reaction of the oxidizable metal to an extent that the temperature rises above human body temperature can be sufficiently accumulated in the heat generating material 30. Furthermore, since the breathability of the heat generating material 30 is sufficiently ensured, oxygen can be sufficiently supplied to the heat generating material 30, and the heat generating efficiency of the heat generating material 30 can be improved. By setting this content to 50 mass % or less, the heat capacity of the heat generating material 30 relative to the amount of heat generated can be suppressed, resulting in a large increase in heat generation temperature, and a temperature increase that can be felt by humans as warmth.

[0057] Examples of the water-absorbing polymer 40 in the heat-generating material 30 include one or more of starch, crosslinked carboxymethyl cellulose, polymers or copolymers of acrylic acid or alkali metal acrylates, polyacrylic acid and its salts, and polyacrylate graft polymers. Sodium salts can be used as polyacrylates. Among these, a partially sodium salt-crosslinked acrylic acid polymer is preferred, as it allows for both continuous generation of water vapor and moderate progression of the oxidation reaction, and prevents unintended detachment of constituent materials, further enhancing production efficiency. The shape of the water-absorbing polymer 40 may be spherical, lumpy, grape-bunch-like, fibrous, or particles formed from a combination thereof. The particle size of the water-absorbent polymer 40 particles is preferably 1 μm or more, more preferably 10 μm or more. The particle size of the water-absorbent polymer 40 particles is preferably 1000 μm or less, more preferably 500 μm or less. The particle size of the water-absorbent polymer particles is measured by dynamic light scattering, laser diffraction, or the like.

[0058] The content of the water-absorbent polymer 40 in the heat generating material 30 is preferably 0.05% by mass or more and 12% by mass or less, and more preferably 0.1% by mass or more and 8% by mass or less. By setting the content of the water-absorbent polymer 40 in the heat generating material 30 to 0.05% by mass or more, the water-absorbent polymer 40 can sufficiently absorb water. Furthermore, by setting the content of the water-absorbent polymer 40 in the heat generating material 30 to 12% by mass or less, the content of the oxidizable metal that contributes to heat generation in the heat generating material 30 can be sufficiently ensured. Furthermore, in the protruding portion 71, for example, the water-absorbing polymer 40 is mainly disposed in the internal space 75 of the lower portion 72 of the protruding portion 71. Similarly, in the extending portion 76, for example, the water-absorbing polymer 40 is mainly disposed in the internal space 79 of the lower portion 77 of the extending portion 76.

[0059] As described above, the heat generating material 30 preferably contains, for example, an electrolyte. As the electrolyte, any electrolyte that is commonly used as a material for this type of heat generating material can be used. Examples of the electrolyte include chlorides and hydroxides of alkali metals, alkaline earth metals, and heavy metals. Among these, chlorides such as sodium chloride, potassium chloride, calcium chloride, magnesium chloride, and iron chloride (iron chloride, iron chloride) are preferred because of their excellent conductivity, chemical stability, and production costs. These electrolytes can be used alone or in combination of two or more. The content of the electrolyte in the heat generating material 30 is preferably 0.5% by mass to 24% by mass, more preferably 1% by mass to 10% by mass, in terms of mass ratio to the water in the heat generating material 30. By setting this content to 0.5 mass% or more, the oxidation reaction of the heat generating material 30 can be sufficiently progressed, and the moisture content of the heat generating material 30 can also be suppressed to ensure the electrolyte necessary for the heat generating function, thereby ensuring a sufficient rise in heat generating temperature. By setting this content to 24 mass% or less, the breathability of the heat generating material 30 can be improved, and the moisture ratio in the heat generating material 30 can be maintained at a certain level to ensure the electrolyte necessary for the heat generating function, so that sufficient water is supplied to the oxidizable metal, etc., resulting in excellent heat generating performance and allowing the electrolyte to be uniformly blended into the heat generating material 30, which is preferable.

[0060] Furthermore, the heat generating material 30 may contain a thickener, a flocculating agent, and other additives. In order to uniformly fill the internal spaces 75 of the minute protrusions 71 and the internal spaces 79 of the extensions 76 with the heat generating material 30, it is preferable to fill the internal spaces 75, 79 with the heat generating material 30 in the form of a fluid slurry, and in this case, it is preferable that the heat generating material 30 contains a thickener. As the thickener, a substance that absorbs water to increase the consistency or that imparts thixotropy, such as a water-soluble polymer material, can be used. Furthermore, as described above, in this embodiment, the internal spaces 75 of the multiple protrusions 71 connected via the extensions 76 and the internal spaces 79 of the extensions 76 are interconnected. Therefore, in the manufacturing process of the steam warming device 100, by filling the heat-generating material 30 in one place (with one nozzle), the heat-generating material 30 spreads throughout under its own weight, filling the internal spaces 75, 79 at once. In other words, the manufacturing efficiency of the steam warming device 100 can be improved.

[0061] The heat-generating temperature of the protrusions 71 of the steam warming device 100 is preferably 35°C or higher and 98°C or lower, and more preferably 38°C or higher and 70°C or lower. The heat-generating temperature of the extension 76 of the steam warming device 100 is preferably 35°C or higher and 98°C or lower, and more preferably 38°C or higher and 70°C or lower. The temperature reached by the steam warming device 100 can be measured using a method equivalent to JIS S4100.

[0062] In the sheet 10 in which the protrusions 71 and the extensions 76 are filled with the heat generating material 30, the amount of water vapor generated per unit weight (1 g) of the heat generating material 30 in 10 minutes is preferably 20 mg / g or more and 250 mg / g or less, and more preferably 70 mg / g or more and 180 mg / g or less. Here, the amount of water vapor (amount of generated water vapor) is measured, for example, as follows. The device used for the measurements is equipped with an aluminum measurement chamber (volume 4.2 L), an inlet channel for introducing dehumidified air (humidity less than 2%, flow rate 2.1 L / min) into the lower part of the measurement chamber, and an outlet channel for discharging air from the upper part of the measurement chamber. An inlet thermo-hygrometer and an inlet flow meter are attached to the inlet channel. Meanwhile, an outlet thermo-hygrometer and an outlet flow meter are attached to the outlet channel. A thermometer (thermistor) is attached inside the measurement chamber. The thermometer used has a temperature resolution of about 0.1°C. At a measurement environment temperature of 30°C (30±1°C), the steam heating device 100 is removed from its packaging and placed in the measurement chamber with one side 10a of the sheet 10 facing up, and a thermometer with a metal ball (mass 4.5g) is placed on top. In this state, dehumidified air is flowed from the bottom of the measurement chamber, and the difference in absolute humidity before and after the air flows into the measurement chamber is determined based on the temperature and humidity measured by the inlet and outlet thermo-hygrometers. Furthermore, the amount of water vapor emitted by the steam heating device 100 is calculated based on the flow rates measured by the inlet and outlet flow meters. The amount of water vapor generated is measured for 10 minutes from the start of measurement.

[0063] Nonwoven fabric sheet 15 is composed of fibers made of a first resin material and binding parts made of a second resin material that bind the fibers together. Similarly to nonwoven fabric sheet 15, nonwoven fabric sheet 17 is also composed of fibers made of a first resin material and binding parts made of a second resin material that bind the fibers together. That is, each of the first nonwoven fabric sheet and the second nonwoven fabric sheet is composed of fibers made of a first resin material and bonding portions made of a second resin material that bond the fibers together. However, the first resin material constituting the nonwoven fabric sheet 15 and the first resin material constituting the nonwoven fabric sheet 17 may be the same material or different materials. Furthermore, the second resin material constituting the nonwoven fabric sheet 15 and the second resin material constituting the nonwoven fabric sheet 17 may be the same material or different materials. In the present embodiment, for example, nonwoven fabric sheet 15 and nonwoven fabric sheet 17 are made of the same material, and the first resin material that makes up nonwoven fabric sheet 15 and the first resin material that makes up nonwoven fabric sheet 17 are the same material, and the second resin material that makes up nonwoven fabric sheet 15 and the second resin material that makes up nonwoven fabric sheet 17 are the same material.

[0064] Materials for the nonwoven fabric sheets 15 and 17 include synthetic fibers, natural fibers, and composite fibers thereof, and manufacturing methods include spunbonding, needle punching, spunlace, meltblowing, flash spinning, airlaid, and air-through methods.

[0065] The first resin material constituting the nonwoven fabric sheets 15 and 17 is not particularly limited, but examples thereof include polyethylene, polypropylene, nylon, rayon, polystyrene, acrylic, vinylon, cellulose, aramid, polyvinyl alcohol, polyethylene naphthalate, or polyethylene terephthalate, and among these, polyethylene terephthalate (PET) is preferred. The second resin material constituting nonwoven fabric sheets 15 and 17 is not particularly limited, but is preferably a material with a lower melting point than the first resin material constituting nonwoven fabric sheets 15 and 17. Examples of the second resin material constituting nonwoven fabric sheets 15 and 17 include polyethylene, polypropylene, ethylene vinyl acetate resin, and low-melting-point PET (copolymer polyester), and among these, polyethylene or low-melting-point PET is preferred. The fibers that make up the nonwoven fabric sheets 15 and 17 may have a core-sheath structure that includes a core made of the first resin material and a sheath made of the second resin material. Each of the nonwoven fabric sheets 15 and 17 is made of at least one resin material having a melting point lower than that of the first resin material and higher than that of the second resin material, and may further include a second binding portion that binds together fibers of a resin material having a melting point higher than that of the first resin material (a group of resins (including at least the first resin material) that do not melt during processing of the nonwoven fabric, which involves forming the protrusions 71).

[0066] The content of the first resin material in the nonwoven fabric sheets 15 and 17 is greater than the content of the second resin material in the nonwoven fabric sheets 15 and 17. Preferably, the content of the first resin material in the nonwoven fabric sheets 15 and 17 is 60% by mass or more and 95% by mass or less. The content of the second resin material in the nonwoven fabric sheets 15 and 17 is 5% by mass or more and 40% by mass or less. By setting the content of the first resin material and the second resin material in the nonwoven fabric sheets 15 and 17 in this manner, it is possible to ensure sufficient breathability of the nonwoven fabric sheets 15 and 17 while also ensuring sufficient rigidity of each of the nonwoven fabric sheets 15 and 17.

[0067] The basis weight of each of the nonwoven fabric sheets 15 and 17 is 15 g / m 2 More than 500g / m 2 Below, especially 30g / m 2More than 350g / m 2 Preferably, the basis weight of each of the nonwoven fabric sheets 15 and 17 is 15 g / m or less. 2 By satisfying the above, sufficient strength of the sheet 10 can be ensured, and the temperature of the heat generating material 30 can be moderated and transferred to the skin 91. The basis weight of each of the nonwoven fabric sheets 15 and 17 is 500 g / m 2 By satisfying the following conditions, the temperature of the heat generating material 30 can be efficiently transmitted to the skin 91 via the sheet 10. However, the basis weight of each of the nonwoven fabric sheets 15 and 17 can be set as appropriate.

[0068] The breathability of the breathable sheet 16 is not particularly limited, but for example, the average moisture permeability of the breathable sheet 16 is 100 g / (m 2 ·24h) or more 13000g / (m 2 24h) or less, especially 200g / (m 2 ·24h) or more 8000g / (m 2 24h) or less. By setting the moisture permeability of the breathable sheet 16 within this range, oxygen is quickly supplied to the heat generating material 30 through the sheet 10 when the steam warming device 100 is removed from the packaging, allowing heat and water vapor to be generated quickly from the heat generating material 30 and ensuring a sufficiently long heat generation duration. The moisture permeability of the breathable sheet 16 can be measured, for example, by the JIS (Z0208) CaCl2 method, and the measurement conditions can be 40°C and 90% RH. The breathable sheet 16 may be breathable over its entire surface or may be breathable only partially. The breathable sheet 16 has a basis weight of 10 g / m 2 More than 200g / m 2 Below, especially 20g / m 2 More than 100g / m 2 By setting the basis weight of the breathable sheet 16 within this range, heat and steam are generated quickly when the steam warming device 100 is removed from the packaging, and the heat generation time can be sufficiently extended.

[0069] Examples of the ventilation sheet 16 include sheets made of resins such as polyolefins such as polyethylene and polypropylene, polyester, polyamide, polyurethane, polystyrene, and polyethylene-vinyl acetate copolymer, in which ventilation holes are mechanically formed; sheets made of mixed sheets of these resins and inorganic fillers, which are stretched to create interfacial peeling to create fine ventilation holes; sheets in which interfacial peeling of the crystalline structure is utilized to create fine ventilation holes; and sheets in which open cells are formed by foam molding to create interconnected fine ventilation holes. More specifically, the breathable sheet 16 can be suitably made of a mixed sheet of polypropylene and calcium carbonate, which is stretched to cause interfacial peeling, thereby forming fine ventilation holes in the mixed sheet.

[0070] The average moisture permeability of the sheet 10 is, for example, 1000 g / (m 2 ·24h) or more 17000g / (m 2 24h) or less, and 2000g / (m 2 ·24h) or more 12000g / (m 2 It is more preferable that the time is 24 hours or less.

[0071] In this embodiment, the average moisture permeability of the second sheet 20 is lower than the average moisture permeability of the sheet 10 . The moisture permeability of the second sheet 20 is, for example, 2000 g / (m 2 24h) or less, especially 1000g / (m 2 24 hours or less is preferable. By setting the moisture permeability of the second sheet 20 within this range, the second sheet 20 can regulate the direction of water vapor generation associated with heat generation by the heat generating material 30. For example, oxygen is supplied to the heat generating material 30 from the sheet 10 side, and water vapor generation from the second sheet 20 can be suppressed, with water vapor being generated mainly from the sheet 10 side.

[0072] The second sheet 20 has a basis weight of 10 g / m 2 More than 200g / m 2Below 20g / m 2 More than 100g / m 2 By setting the basis weight of the second sheet 20 within this range, the second sheet 20 can regulate the direction of water vapor generation due to heat generation.

[0073] Examples of the second sheet 20 include sheets containing resin films made of resins such as polyolefins such as polyethylene and polypropylene, polyester, polyamide, polyurethane, polystyrene, nylon, polyvinylidene chloride, and polyethylene-vinyl acetate copolymer, and in particular, by using a sheet in which an inorganic filler such as titanium oxide is blended into the above resin, the second sheet 20 can effectively conceal the heat generating material 30. A plurality of second sheets 20 can also be used by stacking them. More specifically, examples of the second sheet 20 include a laminated sheet of paper and the resin film, and a laminated sheet of nonwoven fabric and the resin film. In this case, the resin film is on the inner surface side (sheet 10 side) of the second sheet 20, and the paper or nonwoven fabric constituting the second sheet 20 is disposed on the outer surface side (rear surface side) of the second sheet 20. Furthermore, in order to suppress heat dissipation to the rear surface side, a nonwoven fabric may be laminated on the rear surface side of the second sheet 20.

[0074] <Variations 1-3> Next, modified examples 1 to 3 of the embodiment will be described with reference to Figures 7(a), 7(b), and 7(c). Note that the base 11 is not shown in Figures 7(a), 7(b), and 7(c). The steam warming device 100 of this modified example differs from the steam warming device 100 of the above embodiment in the points described below, but in other respects is configured in the same way as the steam warming device 100 of the above embodiment.

[0075] As shown in Figures 7(a), 7(b) and 7(c), in the present invention, the ratio of the height of the extension portion 76 to the height of the protrusion portion 71 can be appropriately set depending on the desired pressing performance and heat generation performance of the steam heating device 100, the intended use of the steam heating device 100, etc.

[0076] For example, as in Modification 1 shown in FIG. 7(a), the ratio of the height of the extension portion 76 to the height of the protrusion portion 71 may be set to 0.08. In this case, protrusions 71 dig deeper into skin 91, and therefore the strength of the pressure of protrusions 71 against skin 91 can be increased. 3(a), the ratio of the width dimension of the extension portion 76 to the diameter of the protrusion portion 71 may be set smaller than in the above embodiment. In this case, the amount of oxygen supplied to the protrusion portion 71 via the extension portion 76 can be reduced.

[0077] Also, for example, as in Modification 2 shown in FIG. 7(b), the ratio of the height of the extension portion 76 to the height of the protrusion portion 71 may be set to 0.69. In this case, protrusions 71 dig into skin 91 more shallowly, and therefore the strength of the pressure of protrusions 71 against skin 91 can be reduced. 7(b), the ratio of the width dimension of the extension portion 76 to the diameter of the protrusion portion 71 may be set larger than in the above embodiment. In this case, the amount of oxygen supplied to the protrusion portion 71 via the extension portion 76 can be increased.

[0078] Also, for example, as in Modification 3 shown in FIG. 7(c), the ratio of the height of the extension portion 76 to the height of the protrusion portion 71 may be set to 0.86. In this case, protrusions 71 dig into skin 91 more shallowly than in modification 2, and therefore the strength of the pressure of protrusions 71 against skin 91 can be reduced. 7(c), the ratio of the width dimension of the extension portion 76 to the diameter of the protrusion portion 71 may be set larger than in Modification Example 2. In this case, the amount of oxygen supplied to the protrusion portion 71 via the extension portion 76 can be further increased.

[0079] The present invention is not limited to the above-described embodiments and modifications, but includes various modifications and improvements as long as the object of the present invention is achieved.

[0080] For example, in the present invention, the sheet 10 may have a plurality of types of protrusions 71 that are different in shape from one another. Also, in this modified example, the sheet 10 may have a plurality of types of protrusions 71 that are different in size from one another. Similarly, in the present invention, the sheet 10 may have a plurality of types of extending portions 76 that are different in shape from one another, or may have a plurality of types of extending portions 76 that are different in size from one another. [Explanation of symbols]

[0081] 10 sheets 10a One side 10b The other side 11 Base 15 Nonwoven fabric sheet 16 Ventilated sheet 17 Nonwoven fabric sheet 20 2nd Sheet 30 Heat generating material 40 Water-absorbent polymer 71 Protrusion 71a Interior space 72 Lower 73 Upper 75 Interior Space 76 Extension part 77 Lower 78 Upper 79 Interior Space 91 Skin 100 Steam heating equipment 114 Mounting part

Claims

1. a breathable first sheet made of nonwoven fabric, the first sheet having two or more protruding portions curved convexly on one side thereof, and an extending portion curved convexly on the one side thereof at a height lower than the protruding portions and extending laterally from a side surface of the protruding portions; a second sheet laminated on a surface of the first sheet opposite to the one surface side; a heat generating material containing an oxidizable metal powder and water, the heat generating material filling the internal space of the protruding portion and the internal space of the extending portion; and a gap is formed between a portion of a surface of the first sheet facing the second sheet and a portion of a surface of the second sheet facing the first sheet, the internal space of the protrusion and the internal space of the extension are each defined by the gap between the first sheet and the second sheet, the extension portions connect the adjacent protrusions to each other, and the internal spaces of the plurality of protrusions connected via the extension portions communicate with the internal spaces of the extension portions; When the heights in the gap from the surface of the second sheet facing the first sheet to the surface of the first sheet facing the second sheet are respectively defined as the height of the internal space of the protrusion and the height of the internal space of the extension, When the steam heating device is placed horizontally with the protruding portion protruding upward and the opposite direction to the protruding portion downward, the heat-generating material occupies more than 70% of the area in the height direction of the internal space of the protruding portion, and the heat-generating material occupies more than 70% of the area in the height direction of the internal space of the extending portion.

2. The first sheet further has a flat sheet-like base, the protrusion and the extension are each curved convexly from the base toward the one surface, 2. The steam warming device according to claim 1, wherein the ratio of the height of the extension to the height of the protrusion is 0.1 or more and 0.4 or less.

3. 3. The steam heating device according to claim 1, wherein the ratio of the surface area of ​​the extension to the combined surface area of ​​the protrusion and the extension is 0.05 to 0.

7.

4. The steam heating device according to any one of claims 1 to 3, a mounting portion having a mounting surface to be mounted on a living body, the mounting surface applying a pressing force of 1 kPa or more and 10 kPa or less to the living body when mounted on the living body; A steam warming kit comprising: The steam heating device kit is arranged so that the protrusions are convex toward the living body.

Images