Heating element precursor, heating element and needle warming moxibustion appliance

Abstract

Provided are a heat-generating body precursor, a heat-generating body, and a needle warming moxibustion device, which are capable of maintaining a longer heating time even when using the same heat-generating composition as conventional heat-generating compositions. One embodiment of the present invention is a heat-generating body precursor (100) which is provided with: a heat-generating composition precursor (10a) that, in the presence of a liquid component, is capable of forming a heat-generating composition that generates heat by reacting with oxygen in the air, said heat-generating composition precursor (10a) being obtained before the liquid component is added; the coating body (20) has a first coating part (20a) comprising a non-gas-permeable packaging material and a second coating part (20b) comprising a gas-permeable packaging material, and the first coating part (20a) has a housing part (24) capable of housing the heat-generating composition precursor (10a) and an opening part (25) for accommodating the heat-generating composition precursor (10a). The second covering part (20b) covers the opening part (25) in a flat shape.

Description

TECHNICAL FIELD

[0001] The present application relates to a heat generator precursor, a heat generator, and a moxibustion device. BACKGROUND

[0002] A heat generator that utilizes oxidation reaction of a metal powder to be oxidized is widely used in medical equipment such as a warm cloth, a moxibustion device for meridian stimulation, or the like, or in daily goods such as a disposable warm pack, and the like.

[0003] Here, the heat generator contains a heat generating composition (for example, containing iron powder, water, a salt, activated carbon, or the like) that generates heat when reacting with oxygen. Also, in use of the heat generator, by exposing the heat generating composition to external air, oxygen in the external air and the heat generating composition come into contact, and oxidation reaction of the metal powder to be oxidized proceeds. Specifically, in the case of the composition of the above example, water and the salt function to accelerate the oxidation speed of the iron powder, and the activated carbon functions to introduce more oxygen in the air to continue the oxidation reaction.

[0004] However, from the viewpoint of inhibiting deterioration of the heat generating performance of the heat generator, it is desirable to inhibit or not to cause oxidation reaction of the metal to be oxidized before use of the heat generator. In view of this, a manufacturing method in which a heat generating composition precursor (a mixture of non-water-soluble components of the heat generating composition containing iron powder, a salt, activated carbon, and a water-retaining material, or the like) is molded into a tablet type, and after being filled into a container composed of a packaging material, water is injected using a syringe (Patent Literature 1), and a manufacturing method in which water is injected through a water-permeable packaging material (Patent Literature 2) have been proposed.

[0005] PRIOR ART DOCUMENTS

[0006] PATENT LITERATURE

[0007] Patent Literature 1: WO2016 / 063815

[0008] Patent Literature 2: WO2022 / 034827 SUMMARY

[0009] An object of the present application is to provide a heat generator and a precursor thereof that can make the heat generation time longer.

[0010] The present application (1) is a heat generator precursor including a heat generating composition precursor before addition of a liquid component, and a coating body,

[0011] The heat generating composition precursor is capable of forming a heat generating composition that generates heat by reacting with oxygen in the air in the presence of the liquid component,

[0012] The covering body has a first covering portion made of a non-air permeable packaging material, and a second covering portion made of an air permeable packaging material,

[0013] The first covering portion has a recessed (or protruded) receiving portion capable of receiving the exothermic composition precursor, and an opening portion for receiving the exothermic composition precursor, and the second covering portion covers the opening portion in a flat manner.

[0014] The present application (2) is an exothermic body precursor including an exothermic composition precursor before addition of a liquid component, and a covering body,

[0015] The exothermic composition precursor is capable of forming an exothermic composition that reacts with oxygen in the air to generate heat in the presence of the liquid component,

[0016] The covering body has a first covering portion made of a non-air permeable packaging material, and a second covering portion made of an air permeable packaging material,

[0017] The first covering portion has a recessed (or protruded) receiving portion capable of receiving the exothermic composition precursor, and an opening portion for receiving the exothermic composition precursor, and the second covering portion covers the opening portion in a flat manner. Here, the receiving portion has a recessed shape when viewed from the opening portion (when the inner side of the receiving portion is viewed). In addition, the receiving portion has a protruded shape when viewed from above (when the outer side of the receiving portion is viewed). The receiving portion has a space capable of receiving the exothermic composition precursor.

[0018] The present application (3) is an exothermic body precursor including an exothermic composition precursor before addition of a liquid component, and a covering body,

[0019] The exothermic composition precursor is capable of forming an exothermic composition that reacts with oxygen in the air to generate heat in the presence of the liquid component,

[0020] The covering body has a first covering portion made of a non-air permeable packaging material, and a second covering portion made of an air permeable packaging material,

[0021] The first covering portion has a first receiving portion (receiving portion 24 described later) capable of receiving the heat generating composition precursor and having a first depth, and an opening portion for incorporating the heat generating composition precursor, and the second covering portion covers the opening portion and has a second receiving portion having a second depth different from the first depth (the depth is the depth with reference to the face of the opening portion 25 described later). The first covering portion has the first receiving portion (receiving portion 24). The first receiving portion has the first depth. The second covering portion has the second receiving portion. The second receiving portion has the second depth. The first depth and the second depth are different. Here, since the second covering portion side becomes the application portion to the adherend at the time of use, it is preferable that the first depth be larger than the second depth (first depth > second depth). In addition, since it is only necessary to be in the relationship of first depth > second depth, the second depth can also be 0.

[0022] The present application (4) is a heat generating body precursor including a heat generating composition precursor before addition of a liquid component, a first covering portion of easily deformable non-air permeable packaging material, and a second covering portion of air permeable packaging material,

[0023] The heat generating composition precursor is capable of forming a heat generating composition that reacts with oxygen in the air to generate heat in the presence of the liquid component,

[0024] The heat generating composition precursor is received between the first covering portion and the second covering portion in a state where the first covering portion is deformed by the heat generating composition precursor. Here, "easily deformable" means the degree of deformability of the face being pressed (with reference to the face not being pressed) to be able to deform in the direction of being pressed when the heat generating composition precursor is pressed against the face of the first covering portion. As a raw material of the first covering portion, for example, a stretchable (only stretch) elastomer film can be given.

[0025] The present application (5) is the heat generating body precursor according to any one of the present application (1) to (4),

[0026] The first covering portion has at least one air hole.

[0027] The present application (6) is the heat generating body precursor according to any one of the present application (1) to (5),

[0028] The heat generating composition precursor includes a swelling agent capable of absorbing the liquid component,

[0029] The swelling agent is capable of swelling in the receiving portion when the liquid component is absorbed.

[0030] The present application (7) is the heat generating body precursor according to any one of the present application (1) to (6),

[0031] The ratio of the volume of the heat generating composition precursor to the volume of the housing is 0.2 or more.

[0032] The present application (8) is the heat generating body precursor according to any one of the present application (1) to (7),

[0033] When the second covering portion faces the heating target, air is introduced to the opening portion from a gap between the second covering portion and the heating target.

[0034] The present application (9) is the heat generating body precursor according to any one of the present application (1) to (8),

[0035] Further, an adhesive is provided which is applied to the second covering portion and overlaps a part of the opening portion.

[0036] The present application (10) is a heat generating body which is the heat generating body precursor according to any one of the present application (1) to (9) into which a liquid component is introduced via the second covering portion in the housing.

[0037] The present application (11) is the heat generating body according to the present application (10),

[0038] The heat generating composition precursor is in a solid form,

[0039] By the liquid component being introduced into the housing, the heat generating composition precursor in the solid form becomes the heat generating composition in a form in which cracks are generated.

[0040] The present application (12) is the heat generating body according to any one of the present application (10) to (11),

[0041] The time during which the heat generating temperature is 40°C or higher (the time from when it becomes 40°C until it becomes 40°C again) is more than 20 minutes (more preferably 30 minutes or more, 40 minutes or more, 50 minutes or more, 60 minutes or more, 70 minutes or more, and there is no particular upper limit, for example, 200 minutes or less). Also, the maximum temperature is not particularly limited, for example, 70°C or lower, 65°C or lower, 60°C or lower, or 55°C or lower.

[0042] The present application (13) is the heat generating body according to any one of the present application (10) to (12),

[0043] By swelling of the heat generating composition precursor, at least a part of the second covering portion bulges outward.

[0044] The present application (14) is a warm moxibustion appliance which includes the heat generating body according to any one of the present application (10) to (13).

[0045] First, the heat generator of the present application relates to a packaging material of a coated body that houses a heat generating composition, a first coated portion is made of a non-air permeable packaging material, and a second coated portion is made of an air permeable packaging material. Therefore, in use, oxygen is supplied to the heat generating composition inside through the second coated portion. At this time, in the case where the second coated portion side is applied to a heating target, according to the configuration of the present application, the gap between the second coated portion / the heating target is small or almost none. Therefore, as a result of the continuous supply of oxygen to the heat generating composition little by little, the exothermic reaction continues for a long period. Also, at the time of evaporation of the liquid component inside the heat generating composition by the heat generation of the heat generating composition, since the first coated portion is made of a non-air permeable packaging material, the evaporation of the liquid component to the outside can be suppressed, the gasification heat taken by the evaporation can be left inside, and a sufficient amount of liquid component required for the reaction can be maintained inside the coated body. According to the above, the heat generator of the present application achieves the effect of being able to make the heat generation time continue longer.

[0046] In addition, the heat generator precursor of the present application achieves the following effect: it is useful as an intermediate product for obtaining a heat generator that achieves the above-mentioned effect. Also, the heat generator precursor of the present application, since it substantially does not contain a liquid component, also achieves the following effect: the oxidation reaction does not substantially proceed, and it can be stored for a long period in this state even if it is not sealed. BRIEF DESCRIPTION OF DRAWINGS

[0047] Figure 1 is a perspective view showing an example of a heat generator precursor / heat generator to which the present embodiment relates.

[0048] Figure 2 is a cross-sectional view schematically showing a cross section of the heat generator precursor to which the present embodiment relates, in the arrow A-A section of Figure 1

[0049] Figure 3 is a cross-sectional view schematically showing a cross section of the heat generator precursor to which the present embodiment relates, in the arrow A-A section of Figure 1 Figure 2

[0050] Figure 4 is a cross-sectional view schematically showing a cross section of the heat generator to which the present embodiment relates, in the arrow A-A section of Figure 1

[0051] Figure 5 is a plan view schematically showing the state when the second coated portion is peeled off and observed from the lower (adhesion surface) side, in the heat generator to which the present embodiment relates, in Figure 4 ​​​​​

[0052] Figure 6 Fig. 1 is a cross-sectional view schematically showing an example in which a vent hole is formed in the first coating portion of a heat generating body precursor according to the present embodiment.

[0053] Figure 7 Fig. 2 is a view illustrating various patterns of an adhesive applied to a heat generating body according to the present embodiment. The hatched portion indicates a portion in which the adhesive is present, and the blanked portion indicates a portion in which the adhesive is not formed. The broken line indicates a boundary with the peripheral portion of the opening portion. The inside surrounded by the broken line is the opening portion, and the outside is the peripheral portion.

[0054] Figure 8 Fig. 3 is a view showing a flow of a manufacturing method of a heat generating body according to the present embodiment.

[0055] Figure 9 Fig. 4 is a view showing a heat generating pattern of a heat generating body according to Example 1 and Comparative Examples 1 and 2.

[0056] Figure 10 Fig. 5 is a view showing a heat generating pattern of a heat generating body according to Example 2 and Comparative Examples 1 and 2.

[0057] Figure 11 Fig. 6 is a view showing a heat generating pattern of a heat generating body according to Example 3 and Comparative Examples 1 and 2.

[0058] Figure 12 Fig. 7 is a view showing a heat generating pattern of a heat generating body according to Example 4 and Comparative Examples 1 and 2.

[0059] Figure 13 Fig. 8 is a view showing a heat generating pattern of a heat generating body according to Example 5 and Comparative Examples 1 and 2.

[0060] Figure 14 Fig. 9 is a view showing a heat generating pattern of a heat generating body according to Example 6 and Comparative Examples 1 and 2.

[0061] Figure 15 Fig. 10 is a view showing a heat generating pattern of a heat generating body according to Example 7 and Comparative Examples 1 and 2. DETAILED DESCRIPTION

[0062] Hereinafter, a "heat generating body precursor" and a "heat generating body" according to one embodiment of the present application will be described in detail. Here, the "heat generating body" is an object (including an object further wrapped with an outer bag) in which a heat generating composition is accommodated in a coating body (described below), and the "heat generating body precursor" is a substance in which a substance (heat generating composition precursor) in a state before a liquid component is introduced into the heat generating composition is accommodated in the coating body (described below).

[0063] The following describes the "heat generating body precursor" and "heat generating body" in detail. Here, the "heat generating body precursor" or "heat generating body" according to the present embodiment has: a surface (hereinafter also referred to as "underside" or "adhesion surface") to be applied to a body, clothes, or other object (heating object) to which heat is to be imparted, and at least one surface on the opposite side thereof (hereinafter also referred to as "upper side" or "upper surface"). Further, for the sake of simplicity of explanation, in the present specification, the body, clothes, and other object (heating object) to which heat is to be imparted are sometimes referred to as "body" or "body or the like". However, the object to which the heat generating body precursor, heat generating body, or moxibustion device according to the present embodiment is applied is not limited to the body.

[0064] The following describes the shape and the like of the "heat generating body precursor" and "heat generating body" according to the present embodiment, the manufacturing method, the use, and the like in detail.

[0065] [1. Shape, structure, size, thickness]

[0066] <1-1. Shape>

[0067] As for the overall shape of the heat generating body precursor / heat generating body according to the present embodiment, other than the fact that the second covering portion (underside) preferably covers the opening of the first covering portion (upper side) in a flat manner, there is no particular limitation. Here, the "flat manner" in the present specification and the present claims includes not only the case where it is completely flat, but also the case where it is substantially flat (it can be said that the second covering portion has a receiving portion) with a slight bulge outward (toward the opposite side of the first covering portion). Here, "substantially flat" means that the bulge is within, for example, 100%, 75%, 50%, 40%, or 30% of the receiving portion height of the first covering portion (for example, refer to Figure 4 Figure 2 ​That height is constant, which means "h" in the figure, and in the case where the height is not constant (not shown in the figure), the average height (here, the "average height" is a value obtained by dividing the volume of the "accommodation portion of the first covering portion" by the area of the "opening portion of the first covering portion"). Here, the second covering portion of the heat generating body precursor is preferably completely flat. By thus configuring, when the liquid component is introduced to the inside through the second covering portion of the heat generating body precursor, since the second covering portion is flat, it is possible to uniformly introduce the liquid component with respect to the surface (the second covering portion) (as a result, it is possible to substantially uniformly introduce the liquid component with respect to the heat generating body precursor). On the other hand, the second covering portion of the heat generating body is preferably a substantially flat shape that is slightly bulged. By thus configuring, in particular, in the case where the heating target object is a soft body (for example, skin), the bulged portion of the second covering portion sinks into the soft body and comes into contact, so it is possible to further reduce the gap between the second covering portion / heating target object. Moreover, since it becomes a state of being more closely attached to the heating target object, heat generated is difficult to escape. According to the above, it is possible to further extend the heating time.

[0068] Incidentally, in the case of considering the use of a moxibustion appliance, as Figure 1 As shown in a perspective view showing an example of the heat generating body precursor / heat generating body to which the present mode relates, the heat generating body precursor / heat generating body to which the present mode relates is preferably a convex three-dimensional shape (moxibustion shape). Furthermore, the shape of the heat generating body precursor / heat generating body to which the present mode relates when viewed from the top or bottom is not particularly limited, and for example, a substantially circular shape, an elliptical shape, a polygonal shape, and the like can be cited. However, if direct attachment to the skin for use is considered, a substantially circular shape, an elliptical shape, which are shapes having no corners, are preferable.

[0069] <1-2. Structure>

[0070] The heat generating body precursor / heat generating body to which the present mode relates has: a heat generating composition precursor / heat generating composition; a covering body having a first covering portion and a second covering portion, the first covering portion having an accommodation portion capable of accommodating the heat generating composition precursor / heat generating composition, and an opening portion for incorporating the heat generating composition precursor, the second covering portion covering the opening portion in a flat shape; and preferably has an adhesive applied to the second covering portion and overlapping a part of the opening portion. Furthermore, the heat generating body precursor / heat generating body to which the present mode relates can have other elements such as a release portion (for example, a release paper) for releasing the surface of the adhesive, in addition to these elements, as needed. The following is described appropriately by dividing into a heat generating body precursor and a heat generating body.

[0071] (1-2-1. Overall structure: heat generating body precursor)

[0072] Figure 2 and Figure 3is a cross-sectional view schematically showing a heat generating body precursor 100 to which one example of the present embodiment is applied. As shown in Figure 2 and Figure 3 The heat generating body precursor 100 to which one example of the present embodiment is applied includes a heat generating composition precursor 10a, a covering body 20, and an adhering body 30. Here, Figure 2 The heat generating composition precursor 10a has a cylindrical shape (flat bottom surface), Figure 3 The heat generating composition precursor 10a has a tablet shape (curved bottom surface).

[0073] In addition, Figure 6 is a cross-sectional view schematically showing an example in which a ventilation hole 40 is formed in the first covering portion 20a in the heat generating body precursor 100 to which the present embodiment is applied. Figure 2 is a modification example of the heat generating body precursor. As shown in Figure 6 The first covering portion 20a can have at least one ventilation hole 40. If the ventilation hole 40 is formed, when the liquid component is introduced into the heat generating body precursor 100, the air in the housing portion 24 is easily led to the outside (becomes an escape passage for the internal air). As a result, the liquid component is introduced into the heat generating composition precursor 10 as a whole and is introduced relatively uniformly, and thus, in addition to the fact that the heat generation for a longer period of time can be stably achieved, the production can be performed without causing the injected liquid component to overflow on the production line. Further, in the case where the first covering portion has at least one ventilation hole, the liquid component can also be introduced from the ventilation hole of the first covering portion.

[0074] (1-2-2. Overall structure: heat generating body)

[0075] Figure 4 is a cross-sectional view schematically showing a heat generating body 200 to which one example of the present embodiment is applied. As shown in Figure 4 The heat generating body 200 of the present embodiment includes a heat generating composition 10b, a covering body 20, and an adhering body 30.

[0076] (1-2-3. Element: heat generating composition precursor / heat generating composition)

[0077] The heat generating composition precursor

[0078] The heating composition precursor involved in this method is not structurally limited as long as it has the composition described later. However, the heating composition precursor involved in this method is preferably a molded body, and among molded bodies, a compression molding body (e.g., a tablet molding body) is particularly preferred. By using a molded body or a compression molding body, a greater amount of heating composition precursor can be introduced into the coating body compared to using an unmolded powdered heating composition precursor. In addition, by using a heating composition precursor as a molded body, when the liquid component is introduced from the second coating portion during the manufacture of the heating body, the liquid component introduced into the interior spreads along the surface of the heating composition precursor as a molded body, resulting in a more uniform and comprehensive introduction of the liquid component into the heating composition precursor. Therefore, the unreacted portion in the heating composition when using the heating body (the portion that cannot be expected to react with oxygen because no liquid component has been introduced) can be reduced, resulting in a longer heating time. Furthermore, when using a heating composition precursor as a molded body, tablet delivery and placement can be easily performed using air or magnets. Furthermore, the shape of the heating composition precursor as a molded body is not particularly limited. For example, the shape of the heating composition precursor as a molded body can be a disc, tablet, prism, pyramid, cube, cuboid, cylinder, cone, elliptical cylinder, tablet shape with a hole in the center, sphere, etc.

[0079] Heating Composition

[0080] The heating composition involved in this method is obtained by introducing a liquid component into a heating composition precursor. Here, as... Figure 4 As shown, when the preformed heating composition precursor 10a ( Figure 2 When the liquid component is introduced, the liquid-absorbing component (e.g., a swelling agent) in the heating composition precursor absorbs the liquid component, thereby causing a sharp increase in the volume of the liquid-absorbing component. The volume expansion rate relative to the heating composition precursor (volume of the heating composition / volume of the heating composition precursor × 100%) has lower limits of, for example, 150% or more, 175% or more, 200% or more, 225% or more, and 250% or more, and upper limits of, for example, 500% or less, 450% or less, 400% or less, 350% or less, and 300% or less. Furthermore, this sharp increase in volume results in, for example... Figure 4As shown, the formed shape develops cracks 11, resulting in a partially disintegrated heating composition. To elaborate, when a liquid component is added to a heating composition precursor containing a liquid-absorbing component, the precursor typically tends to pulverize due to the swelling of the liquid-absorbing component. On the other hand, when the heating composition precursor is housed within a cover as in this embodiment, the swelling of the precursor caused by the addition of the liquid component is limited by the inner wall of the cover. Therefore, it is presumed that the cracking is due to internal stress caused by the precursor not becoming pulverized. Figure 5 It is a schematic representation in Figure 3 This is a plan view of the heating element 200 in this embodiment, when the second covering portion 20b is peeled off and viewed from the bottom (attached surface) side. (See attached surface). Figure 4 and Figure 5 As shown, by generating cracks 11 through the heating composition 11b, air is supplied not only to the outside of the heating composition 10b but also to the inside. As a result, the amount of heating composition reacting is substantially increased, enabling the heating time to be sustained for a longer period of time.

[0081] (1-2-4. Element: Covering)

[0082] The covering material involved in this method, as described above, has a first covering portion and a second covering portion. Here, refer to... Figure 2 and Figure 4 The covered body involved in this method is described in detail.

[0083] Overall Covered Body

[0084] like Figure 2 and Figure 4 As shown, the covering 20 according to this method has a first covering portion 20a and a second covering portion 20b. The first covering portion 20a includes a surface other than the body side surface, namely the upper surface 21 (outer upper surface, inner upper surface) and a side surface (outer side surface, inner side surface). The second covering portion 20b is applied to the body or the like in a face-to-face manner (e.g., via adhesive 30). Here, the second covering portion 20b includes the surface applied to the body or the like, namely the lower surface (attaching surface) 22. The covering 20 has a peripheral portion 23 that protrudes outward. The first covering portion 20a and the second covering portion 20b are joined at the peripheral portion 23. The first covering portion 20a and the second covering portion 20b will be described below.

[0085] 1st covering part

[0086] The first covering portion 20a has a concave shape capable of receiving the heat-generating composition precursor 10a / heat-generating composition 10b (viewed upside down). Figure 2In the case of a receiving portion 24 (e.g., composed of an inner upper surface and an inner side surface). The first covering portion 20a has an opening 25 for receiving the heat-generating composition precursor 10. Here, as Figure 2 As shown, the inner surface of the first covered portion and the opening are opposite to each other. The first covered portion 20a can be manufactured, for example, by processing a resin sheet using methods such as thermoforming or vacuum forming. Here, the surface area of ​​the storage portion 24 (the total surface area of ​​the inner surface and the inner side surface constituting the storage portion 24) is preferably 250 to 2500 mm². 2 More preferably, 450~1600mm 2 More preferably 600~1300mm 2 Furthermore, the width of the storage portion 24 (the distance between the relative inner sidewalls, for example, the inner diameter when the first covering portion is cylindrical, the average value calculated from the smallest and largest inner diameters when the first covering portion is frustum-shaped, the major and minor axes when the first covering portion is elliptical cylindrical, and the long and short sides when the first covering portion is square) is preferably 7 to 30 mm, more preferably 10 to 25 mm, and even more preferably 13 to 22 mm. Additionally, the ratio of the surface area of ​​the storage portion inside the first covering portion to the height of the storage portion (surface area of ​​the storage portion / height of the storage portion: mm) is... 2 The width (mm) is preferably 40-210, more preferably 60-190, and even more preferably 80-170. Furthermore, the ratio of the width of the storage portion inside the first covered portion to the height of the storage portion (width of storage portion / height of storage portion: mm / mm) is preferably 0.8-5.0, more preferably 1.2-4.0, and even more preferably 1.5-3.5. Moreover, the "width" here, when the width differs relative to the height direction, is defined as the average width (based on the average area, i.e., the volume of the storage portion divided by the height of the storage portion, and the diameter of the circle considered to have this average area). When the width is within the suitable range described above, longer heating time can be achieved.

[0087] In this case, the first covering portion (non-air permeable packaging material) can have or can not have a ventilation hole as described above. In this case, in the case of having a ventilation hole, the shape of the ventilation hole is not particularly limited, and for example, one or a combination of a circular shape, a square shape (for example, a square), a slit, and the like can be cited. In addition, in the case of having a ventilation hole, the position of the ventilation hole is not particularly limited as long as it is in the accommodation portion, and can be the upper surface and / or the side surface. In addition, in the case of having a ventilation hole, the size of the ventilation hole is preferably 0.1 to 1.5 mm, more preferably 0.2 to 1.2 mm, and further preferably 0.3 to 1.0 mm. Furthermore, in the case of not being a circular shape, the size of the longest portion {for example, the diagonal line in the case of being a square, and the slit length (length of the vertical slit) in the case of being a slit} is provided. In addition, in the case of having a ventilation hole, the number of ventilation holes is preferably 1 to 10, more preferably 1 to 5, and further preferably 1 to 2. In addition, in the case of having a ventilation hole, the ratio of the total area of the ventilation holes to the surface area of the accommodation portion (total area of the ventilation holes / surface area of the accommodation portion: mm 2 / mm 2 × 100%) is preferably 0.0005 to 2.8%, more preferably 0.002 to 1.8%, and further preferably 0.005 to 1.3%. If within such a suitable range, heating can be performed for a longer period of time. Furthermore, the ventilation hole has a function of discharging air in the case of injecting water from the nonwoven fabric side (the second covering portion side). On the other hand, in the case of injecting water from the ventilation hole, the nonwoven fabric side has a function of discharging air.

[0088] Furthermore, as the first covering portion, a raw material having a high deformability can also be used. In this case, the "high deformability" as described above refers to a deformability in which, when the heat generating composition precursor is pressed against a surface of the first covering portion, the surface being pressed (based on the surface not being pressed) can be deformed in the direction of being pressed to a degree (for example, deformed in the direction of being pressed by 1 / 3 or more, 1 / 2 or more, 2 / 3 or more, or 1 or less of the thickness of the heat generating composition precursor). In the case of using such a raw material, a process of deforming the first covering portion and then housing the heat generating composition precursor in the deformed portion (i.e., the accommodation portion, the opening portion) as described above is not required. That is, the deformation of the first covering portion and the housing of the heat generating composition precursor are simultaneously performed by pressing the heat generating composition precursor against the surface of the first covering portion. Then, in a state in which the heat generating composition is housed in the first covering portion, the second covering portion is joined to the first covering portion, whereby a heat generating body precursor can be obtained.

[0089] Second Covering Portion

[0090] The second covering portion 20b engages with the first covering portion 20a in such a flat manner as it covers the opening 25 of the first covering portion 20a.

[0091] (1-2-5. Element: adhesive)

[0092] The heating element precursor and heating element involved in this method preferably have an adhesive on the surface of the second covered portion opposite to the side of the first covered portion. For example, such as Figure 2 As shown, the adhesive 30 is applied to the attachment surface of the second cover portion 20b. The adhesive 30 is applied to the body or similar material with the second cover portion 20b facing each other. The adhesive 30 is applied to the second cover portion 20b, for example, overlapping a portion of the opening 25 of the first cover portion 20a. Therefore, by changing the position, shape, and size of the applied adhesive 30, the area of ​​the region where the first cover portion 20a overlaps with a portion of the opening 25 can be adjusted. This also allows control over the area of ​​the region within the opening 25 that does not overlap with the first cover portion 20a, i.e., the area within the opening 25 where substantial ventilation is possible (ventilation area 26). By controlling the area of ​​the adhesive in this way, the heating temperature and heating time can also be controlled. Furthermore, by providing the adhesive 30, the gap between the second cover portion 2b and the body or similar material can be stably maintained. As a result, the amount of air introduced into the interior can be controlled to a small amount, thus allowing the oxidation reaction time to continue for a longer period. By placing the adhesive on the second covered portion in such a way that it overlaps with a portion of the opening, it is possible to ensure that the heating reaction continues for a long time and that it adheres to and remains attached to the object being heated.

[0093] Figure 7 This diagram illustrates various patterns of the heating element precursor and the adhesive body 30 of the heating element 200 involved in this method. The diagonally lined portions indicate areas where the adhesive body 30 is present, and the white portions indicate areas where the adhesive body 30 is not formed. The dashed lines indicate the boundary between the opening 25 and the peripheral portion 23. The inner side enclosed by the dashed lines is the opening 25, and the outer side is the peripheral portion 23. The position, size, and shape of the adhesive body 30 are not particularly limited. For example, as... Figure 7 As shown, the adhesive 30 can be applied in any position, size, and shape, such as stripes, circles, or rectangles. Here, as described above, when the second coating of the heating element expands slightly outward (for example, see reference...), Figure 4 If applied to an object to which it is attached, the heating element tends to easily peel off. Therefore, it is preferable to have an adhesive material approximately in the center of the back surface (attachment surface) of the heating element (e.g., in...). Figure 7 In the case of examples, the 3rd and 5th from the left in the upper paragraph, and the 1st to 3rd from the left in the lower paragraph.

[0094] <1-3. Size and Thickness>

[0095] (1-3-1. Precursor to the exothermic composition)

[0096] The size of the precursor of the heating composition involved in this method is not particularly limited, and can be set to a size and shape corresponding to the application of the heating element. For example, in the case of manufacturing a heating element for use as a moxibustion device, the precursor of the heating composition is preferably a solid form with a width of 2 mm to 30 mm (diameter in the case of a cylinder) and a height of 2 mm to 15 mm. For example, Figure 2 As shown, when the precursor of the heating composition is cylindrical, A in the figure represents the width and B represents the height. Figure 3 As shown, when the precursor of the heating composition is in tablet form, C in the figure represents the width, and D represents the height. Furthermore, in cases such as... Figure 3 In cases where the width and height are not constant, the width is set to the average width, and the height is set to the height at the maximum height portion. Here, the solid-state (preferably molded) precursor of the heating composition preferably has a certain thickness; specifically, the ratio of the height of the heating composition precursor to its surface area (height / surface area: mm / mm²) is... 2 The preferred value is 0.008~0.09, more preferably 0.014~0.08, and even more preferably 0.02~0.07. Furthermore, the "area of ​​the surface" here, when the area differs relative to the height direction, is defined as the average area (the average area is the value obtained by dividing the volume of the heating composition precursor by the height).

[0097] (1-3-2. Coverings)

[0098] The size of the covering used in this method is not particularly limited, as long as it is appropriately determined based on the amount of the heating composition precursor housed inside and the area of ​​the object to be heated. For example, Figure 2 and Figure 4 As shown, when the heating composition precursor 10a contains a swelling agent, the swelling of the swelling agent after the liquid component is injected results in the volume of the heating composition 10b becoming larger than the original volume of the heating composition precursor 10a. Furthermore, if the volume of the coating is too small, the liquid component may overflow before being absorbed by the heating composition precursor 10a during injection. Considering these factors, as... Figure 2 As shown, at least with respect to the heating element precursor 100, it is preferable that there is space within the receiving portion 24 (the gap between the heating composition precursor 10a and the first covering portion 20a). That is, as Figure 2As shown, the diameter of the receiving portion upper surface 21 of the first covering portion 20a and / or the receiving portion height h is preferably larger than the diameter of the heat generating composition precursor 10a and / or the height, respectively. For example, in the case of manufacturing a heat generating body for use as a moxibustion appliance, the diameter of the upper surface 21 of the first covering portion 20a is preferably 5 mm to 40 mm. The receiving portion height h of the first covering portion 20a is preferably 5 mm to 20 mm. In addition, the thickness of the first covering portion and the second covering portion is not particularly limited and is typically about 6 to 800 μm, and is preferably about 20 to 700 μm.

[0099] (1-3-3. Volume ratio)

[0100] The lower limit of the ratio of the volume of the heat generating composition precursor 10a to the volume of the receiving portion 24 is preferably 0.1 or more, more preferably 0.2 or more, and further preferably 0.3 or more, and the upper limit is preferably 0.7 or less, more preferably 0.6 or less, and further preferably 0.5 or less. If the volume ratio is set to the appropriate range, the liquid component can be introduced substantially uniformly throughout the entire heat generating composition when the liquid component is introduced into the heat generating composition precursor, and the heat generating composition (the portion of the heat generating composition precursor into which the liquid component is introduced) can be maximized, and thus the oxidation reaction time can be further extended.

[0101] (1-3-4. Adhesive)

[0102] In the case where the adhesive according to the present embodiment is applied to the heat generating body, the adhesive is applied to the second covering portion 20b so that the lower limit of the ratio of the area of the ventilation region 26 to the area of the opening portion 25 is preferably 0.05 or more, more preferably 0.1 or more, and further preferably 0.2 or more, and the upper limit is 1 or less, preferably 0.95 or less, more preferably 0.9 or less, and further preferably 0.85 or less. By being set to the appropriate range, the amount of oxygen introduced into the inside of the heat generating body can be reduced to an appropriate range when the heat generating body is applied to the heating target, and as a result, the oxidation reaction time can be further extended. Furthermore, in the case where the adhesive is applied to the heat generating body, the case where the ratio of the area of the ventilation region 26 to the area of the opening portion 25 is 1 means that the adhesive is not applied to the ventilation region, for example, the adhesive is applied to at least a portion of the peripheral edge portion of the heat generating body (i.e., the portion of the periphery of the opening portion that is welded, as shown in 23 in FIG. 1). Figure 2 The thickness of the adhesive is typically preferably 5 to 250 μm, more preferably 10 to 220 μm, and further preferably 20 to 200 μm.

[0103] [2. Material, composition, formulation]

[0104] (2-1. Heat generating composition precursor)

[0105] The heat generating composition precursor according to the present embodiment contains a metal powder to be oxidized, one or more kinds of salts, activated carbon, a swelling agent, and various components as needed. Each component will be described in detail below.

[0106] Metal powder to be oxidized

[0107] The metal powder to be oxidized according to the present embodiment is not particularly limited as long as it is a metal powder that generates heat upon oxidation, and is typically iron powder. As specific examples of the metal powder to be oxidized, there can be mentioned iron powder (reduced iron, cast iron, atomized iron, iron sulfate), aluminum powder, zinc powder, manganese powder, magnesium powder, calcium powder, and the like. Here, the heat generating composition precursor contains the metal powder to be oxidized in a range of about 10% by mass to about 80% by mass, preferably about 15% by mass to about 70% by mass, based on the total mass of the heat generating composition precursor. Furthermore, in the present specification, "%" means "% by mass" unless otherwise specified.

[0108] Salt

[0109] The salt according to the present embodiment is an electrolyte that can be dissolved in a liquid component to dissociate. As specific examples of the salt according to the present embodiment, there can be mentioned salts of alkali metals (for example, sodium, potassium, and the like), alkaline earth metals (for example, magnesium, calcium, and the like), other metals (for example, manganese, copper, and the like) with inorganic acids (for example, chlorides, sulfates, carbonates, nitrates, and the like), with organic acids (for example, acetates, and the like), or mixtures thereof. Among these salts, sodium chloride, calcium chloride, magnesium chloride, copper chloride, and mixtures containing them are preferred. Here, the heat generating composition precursor contains the salt in a range of preferably about 0.5% by mass to about 10% by mass, more preferably about 1% by mass to about 5% by mass, based on the total mass of the heat generating composition precursor.

[0110] Activated carbon

[0111] The activated carbon according to the present embodiment is not particularly limited. As specific examples of the activated carbon according to the present embodiment, there can be mentioned activated carbon derived from plant raw materials such as coconut shells, wood, and the like, activated carbon derived from animal raw materials, and activated carbon derived from other raw materials. Here, the heat generating composition precursor contains the activated carbon in a range of preferably about 0.5% by mass to about 25% by mass, more preferably about 0.5% by mass to about 20% by mass, further preferably about 1% by mass to about 15% by mass, based on the total mass of the heat generating composition precursor.

[0112] Swelling agent

[0113] The swelling agent according to the present embodiment is not particularly limited as long as it swells in volume by absorbing the liquid component. As specific examples of the swelling agent according to the present embodiment, there can be mentioned hydrophilic polymers such as dry gelatin, gelatin, agar, and the like, and hydrophobic polymers that are difficult to inhibit swelling by inorganic salts. A particularly preferred swelling agent is a polymer composed of a crosslinked product of an acrylic acid salt (superabsorbent resin). Here, the heat-generating composition precursor contains the swelling agent in a range of preferably less than 45% by mass, more preferably from about 0.1% to about 30% by mass, further preferably from about 0.5% to about 20% by mass, and particularly preferably from about 1% to about 10% by mass, based on the total mass of the heat-generating composition precursor.

[0114] Additional Various Components

[0115] The additional various components according to the present embodiment are binders, temperature control agents, pH adjusting agents, oxidation reaction accelerators, hydrogen gas inhibitors, extenders, fillers, anti-coagulation agents, thickening agents, surfactants, and the like. One or more of them are appropriately used as needed. Among them, the binders, temperature control agents, and pH adjusting agents are described in detail. First, the binder according to the present embodiment is an agent for molding the powder raw material into a solid form. As specific examples of the binder according to the present embodiment, there can be mentioned cellulose (e.g., crystalline cellulose), starch, dextrin, sucrose ester, Teflon (registered trademark), lactose, polyethylene glycol (PEG), and the like. Among them, crystalline cellulose and PEG are particularly preferred. ), carboxymethyl cellulose, calcium silicate, synthetic hydrotalcite, magnesium metasilicate aluminate, dry aluminum hydroxide gel, corn starch, calcium carbonate, acacia, gelatin, guar gum, kaolin, calcium hydrogen phosphate, calcium phosphate, polyethylene oxide, xanthan gum, ammonium methacrylate copolymer, vinyl acetate copolymer, sugar syrup, povidone, lactitol, calcium sulfate, algin, alginic acid, and the like. In this case, when molding (e.g., tablet molding) is performed, the binder is contained in a range of preferably about 5 mass% to about 50 mass%, more preferably about 5 mass% to about 45 mass%, further preferably about 10 mass% to about 40 mass%, based on the total mass of the heat-generating composition precursor. In addition, the temperature-controlling agent involved in the present mode is an agent that controls the upper limit of the heat-generating temperature. As specific examples of the temperature-controlling agent involved in the present mode, there can be mentioned aliphatic compounds having a melting point of 35°C or higher and 70°C or lower and a water solubility at 20°C of 5 g / 100 mL or less, and more specifically, higher α-olefin polymers (copolymers of two or more α-olefins having 10 to 35 carbon atoms or copolymers of one or more α-olefins having 10 to 35 carbon atoms and one or more other olefins, preferably side chain crystalline polyolefins having a certain long chain α-olefin in the side chain), various paraffins of vegetable, animal, or petroleum origin or the like, myristyl myristate, polyester polyol, polyoxyethylene fatty acid diester, and the like. The heat-generating composition precursor contains the temperature-controlling agent in a range of preferably 0 to about 40 mass%, more preferably about 0.1 mass% to about 35 mass%, further preferably about 0.5 mass% to about 30 mass%, based on the total mass of the heat-generating composition precursor. Furthermore, the pH adjusting agent involved in the present mode is not particularly limited as long as it functions to prevent the outer bag from swelling due to hydrogen gas during storage. As specific examples of the pH adjusting agent involved in the present mode, there can be mentioned sodium sulfite, sodium polyphosphate, sodium thiosulfate, and the like. The heat-generating composition precursor contains the pH adjusting agent in a range of preferably about 0.01 mass% to about 5 mass%, more preferably about 0.1 mass% to about 2 mass%, based on the total mass of the heat-generating composition precursor.

[0116] (2-2. Heat-generating composition)

[0117] The heat-generating composition involved in the present mode is a heat-generating composition to which a liquid component is added to the heat-generating composition precursor described above. The liquid component is described below.

[0118] Liquid component

[0119] The liquid component according to the present embodiment is not particularly limited as long as it is a liquid component that becomes a medium of a liquid that forms a dissolved salt to ionize the salt, and that plays a role of breaking the oxide film of iron for the continuation of the oxidation reaction of iron and a role of passing electricity in the heat generating composition. A preferred example of the liquid component according to the present embodiment is water. As the water, for example, ion exchange water, pure water, tap water, industrial water, and the like can be given. In addition, the liquid component can contain other components {for example, a salt, a pH adjuster (for example, sodium sulfite)} as needed. Here, the amount of the liquid component to be injected into the heat generating composition precursor is preferably 10 to 50 parts by mass, more preferably 15 to 40 parts by mass, further preferably 17.5 parts by mass to 35 parts by mass, and most preferably 20 parts by mass to 30 parts by mass, with respect to 100 parts by mass of the heat generating composition precursor. In addition, from the viewpoint of the content of the liquid component in the heat generating composition, the heat generating composition contains the liquid component in a range of preferably about 1% by mass to about 40% by mass, and more preferably about 10% by mass to about 30% by mass, based on the total mass of the heat generating composition precursor.

[0120] Preferred combination of the heat generating composition

[0121] As described above, the preferred combination of the heat generating composition according to the present embodiment is that, based on the total mass of the heat generating composition, the metal powder to be oxidized is 15% by mass to 60% by mass, the salt is 1% by mass to 4% by mass, the activated carbon is 2% by mass to 10% by mass, the liquid component (for example, water) is 10% by mass to 40% by mass, the swelling agent is 1% by mass to 10% by mass, the binding agent is 12% by mass to 20% by mass, and the temperature control agent is 0% by mass to 25% by mass.

[0122] (2-3. First coated portion)

[0123] The first covering is made of a non-breathable packaging material. As a result, liquid components (e.g., water or water vapor) in the heating composition are trapped and condensed on the inner surface of the first covering, making it difficult for them to escape from the heating composition. Consequently, a heating element or moxibustion device with a longer heating duration at high temperatures can be provided. Here, "non-breathable packaging material" refers to, for example, a packaging material with an air permeability of 80,000 seconds / 100cc or more. Furthermore, the air permeability is a value measured using JIS P 8117:2009 (Gree method). However, when the non-breathable packaging material has vents, the preferred lower limit for the air permeability of the first covering with these vents is, for example, 4 seconds / 100cc, 5 seconds / 100cc, or 6 seconds / 100cc, and the preferred upper limit is, for example, 60 seconds / 100cc, 80 seconds / 100cc, or 100 seconds / 100cc. Specific examples of raw materials for non-breathable packaging materials include polyethylene, polypropylene, polyester, polyamide, polyvinyl alcohol, polyvinyl chloride, polyvinylidene chloride, polyurethane, polystyrene, ethylene-vinyl acetate copolymer, polycarbonate, and hydrochloric acid rubber, either individually or in combination. Additionally, non-breathable packaging materials can also be made of synthetic fibers such as paper, aluminum sheets, polyurethane foam, and polyvinyl chloride, as well as fabrics such as cotton, linen, and silk, and their laminates. Furthermore, in selecting the raw material for the first covering part, when heat sealing is used as the bonding method with the second covering part, it is preferable to determine the material based on its relationship with the raw material of the second covering part. Furthermore, the first covering part does not need to be composed solely of non-breathable packaging material; for example, it can be a composite of non-breathable packaging material and non-woven fabric. Moreover, when the aforementioned deformable covering part is used as the first covering part, tensile materials and stretchable materials are preferably used as raw materials for the first covering part. Specific examples include olefin-based elastomers, polyurethane-based elastomers, and rubber-based elastomers.

[0124] (2-4. Second covered part)

[0125] The second covering is made of a breathable packaging material. This allows oxygen to be supplied to the heating composition from the outside when the heating element is in use. Furthermore, if the breathable packaging material is permeable to liquid components (e.g., water-permeable), even during the manufacture of the heating element, by spraying, for example, a liquid component onto the side of the breathable packaging material opposite to the side facing the first covering, the liquid component can be introduced into the packaging material through the second covering. Here, the breathable packaging material is not particularly limited as long as it allows air from outside the heating element to be introduced into the heating element; examples include packaging materials with an air permeability of 100 seconds / 100cc or less (JIS P8117:2009, Grief method) (e.g., 50 seconds or less, 25 seconds or less, 10 seconds or less, 5 seconds or less, 1 second or less, 0.5 seconds or less). Furthermore, examples of structures for the second covering portion include nonwoven fabric, woven fabric, single-layer or multi-layer porous membranes or sheets, single-layer or multi-layer non-porous membranes or sheets with pinholes, and combinations thereof. Specific examples of breathable packaging materials (nonwoven fabric, woven fabric) are preferably breathable packaging materials used in the technical fields of heating elements and medical heating devices. Examples include materials containing synthetic fibers such as nylon, vinylon, polyester, rayon, acetate, acrylics, polyethylene, polypropylene, and polyvinyl chloride, as well as natural fibers such as cotton, linen, silk, and wool. Examples of nonwoven fabrics include spunbond, thermally bonded, and spunlace nonwoven fabrics. Nonwoven fabric is preferred from the perspective of allowing air to be introduced from the side of the second covering portion (in a direction parallel to the surface of the adhered body when attached). Furthermore, if the breathability of the nonwoven fabric (second covering portion) from this side can be ensured, it is also conceivable to provide an adhesive layer on the entire back surface of the heating element. Here, the unit area mass of nonwoven fabric is generally about 10 g / m². 2 ~ Approximately 800g / m 2 The range is suitable, with approximately 20g / m³ being preferred. 2 ~ Approximately 500g / m 2 Furthermore, as a specific example of a breathable packaging material (a film or sheet that is breathable in its entirety or partially), stretch film (preferably a stretched porous film or a sheet containing it) can be cited. Stretch porous films generally contain inorganic fillers, and through stretching, interconnected pores are formed, thereby exhibiting breathability. As described above, the type of raw material used as the breathable packaging material, and the degree of breathability, is appropriately determined based on the heat-generating composition used, the required heat generation, temperature, and heating time. Additionally, in selecting the raw material for the second covering portion, when heat sealing is used as the bonding method with the first covering portion, it is preferable to determine it based on its relationship with the raw material of the first covering portion.

[0126] Furthermore, the second coating is preferably flexible, i.e., soft and bendable. During the manufacture of the heating element according to this method, the heating composition expands after the liquid component is injected. In this case, the second coating becomes a state in which at least a portion bulges outward along the swollen shape of the heating composition. The flexibility allows for this bulging.

[0127] Furthermore, the breathable packaging material constituting the second covering portion preferably has a water pressure resistance higher than the liquid pressure at which the liquid component is injected. Based on the relationship with the liquid pressure at the time of injection (described later), the water pressure resistance (hydraulic pressure resistance) of the breathable packaging material is preferably 0.1 to 100 kPa, more preferably 0.1 to 30 kPa, further preferably 0.5 to 30 kPa, and most preferably 1 to 30 kPa.

[0128] (2-5. Adhesive body)

[0129] The adhesive used in this method is not particularly limited; it can be solvent-based, emulsion-based, hot-melt-based, or gel-based (e.g., sodium polyacrylate). Specific examples of adhesives include acrylic adhesives, rubber adhesives, polyurethane adhesives (urethane acrylate adhesives), polysiloxane adhesives, ethylene-vinyl acetate copolymer adhesives, polyester adhesives, polyamide adhesives, and epoxy adhesives.

[0130] [3. Manufacturing method of heating element]

[0131] Reference Figure 8 This describes the manufacturing method of the heating element involved in this method. Figure 8 This is a diagram illustrating an example of the process flow (S1) of the manufacturing method of the heating element involved in this method. Furthermore, Figure 8 S10~S30 in this method correspond to the manufacturing method of the heating element precursor involved in this approach. For example... Figure 8 As shown, the manufacturing method S1 of the heating element according to this method includes a manufacturing step S10 of a heating composition precursor, a manufacturing step S20 of a first coating portion, a sealing step S30 of the heating composition precursor, a liquid component injection step S40, and a sealing step S50 of the outer bag. Hereinafter, an example (S1) of the manufacturing method of the heating element according to this method will be described in terms of each step.

[0132] <3-1. Manufacturing process S10 of the precursor of the exothermic composition>

[0133] Step S10 of manufacturing the precursor of the heating composition is a step of mixing and molding the components of the precursor of the heating composition {e.g., pressure molding (e.g., tableting)}. Furthermore, the components are as described above. However, the components of the heating composition are divided into solid components (at room temperature) and liquid components (at room temperature). The former is further divided into insoluble components that are insoluble or poorly soluble relative to the liquid component (e.g., water-insoluble components; for example, metal powder to be oxidized, activated carbon, swelling agents, temperature control agents, etc.) and soluble components that are easily soluble relative to the liquid component (e.g., water) (e.g., water-soluble components; for example, salts, pH adjusters, etc.). In step S10 of manufacturing the precursor of the heating composition, the precursor of the heating composition is manufactured by mixing only the insoluble components (e.g., water-insoluble components) or by mixing the insoluble components (e.g., water-insoluble components) with one or more soluble components (e.g., water-soluble components). That is, a suitable precursor for a heating composition is a mixture of components that are solid at room temperature, consisting of insoluble components (e.g., non-water-soluble components) or containing insoluble components (e.g., non-water-soluble components) and one or more soluble components (e.g., water-soluble components), and substantially contains no liquid components (e.g., an aqueous solution containing only water, a portion or all of the water-soluble components, or an aqueous solution containing a portion or all of the water-soluble components and components other than water that are liquid at room temperature). Here, "insoluble or poorly soluble" refers to a component that dissolves in less than 1g of 100g of liquid component at room temperature (25°C). On the other hand, "easily soluble" refers to a component that dissolves in more than 1g of 100g of liquid component at room temperature (25°C). Here, a more specific example is used to illustrate the manufacturing process S10 of the heating composition precursor. The solid components (insoluble and soluble components) that make up the heating composition precursor are prepared as follows: iron powder, activated carbon, salt, a water-absorbing polymer as a swelling agent, and crystalline cellulose as a binder. The above solid components are measured, sealed in a polyethylene bag, and then mixed. The resulting mixture is molded (e.g., pressure molded (e.g., tableted using a benchtop tablet press)) to produce a cylindrical heating composition precursor.

[0134] <3-2. Manufacturing process S20 of the first coating>

[0135] The manufacturing process S20 of the first cover portion is a process that manufactures the first cover portion before, after, or in parallel with the manufacturing process S10 of the heat-generating composition precursor. Furthermore, it is preferable that the manufacturing process S20 of the first cover portion is performed before or in parallel with the manufacturing process S10 of the heat-generating composition precursor, so that the heat-generating composition precursor can be sealed into a bag or container immediately after manufacture. Here, the manufacturing process S20 of the first cover portion is described with a more specific example: by molding a non-breathable packaging material (e.g., polyester) (e.g., by sandwiching the non-breathable packaging material between a heated convex stainless steel mold and a concave stainless steel support mold and pressing it), a first cover portion having a deep receiving portion (recess) and a peripheral portion can be obtained.

[0136] <3-3. Encapsulation process of the precursor of the exothermic composition, S30>

[0137] The sealing process S30 of the heating composition precursor is a process of manufacturing a heating element precursor by sealing the heating composition precursor into a cover. Here, a more specific example is given of the sealing process S30 of the heating composition precursor: the heating composition precursor manufactured in the manufacturing process S10 (from the opening of the first cover portion) is inserted into the receiving portion of the first cover portion manufactured in the manufacturing process S20 of the first cover portion, and then a second cover portion (e.g., a breathable polyester nonwoven fabric) is placed on top of the first cover portion. Next, the first cover portion and the second cover portion are joined (e.g., heat-pressed; as a specific example, heat-pressed by applying pressure from the second cover portion side using a heated stainless steel heat-sealing strip) to seal the heating composition precursor. The above process is the manufacturing process of the heating element precursor. Furthermore, the manufacturing processes S10 to S30 can also be performed by deep-draw packaging. Specifically, for example, this deep-drawing packaging process includes: a step of creating a recess (receiving portion) by vacuum forming (e.g., heated vacuum forming) of a base material (e.g., a roll) that will become the raw material for the first coating portion; a step of inserting a precursor of a heating composition therein; thereafter, a step of sealing (e.g., in a vacuum) a top material (e.g., a roll) that will become the raw material for the second coating portion from above; and a step of cutting. Furthermore, the liquid component injection step involved in S40 described below can be performed before or after the cutting step. When this deep-drawing packaging process is used, the molding height is highly stable, and as a result, performance deviations between products can be further prevented.

[0138] <3-4. Liquid component injection process S40>

[0139] The liquid component injection step S40 is a step of injecting a liquid component into the heating element precursor manufactured in the heating element precursor sealing step S30. Here, the liquid component injection step S40 is explained with a more specific example: the liquid component is applied while pressure is applied to the second coating portion (the portion covering the opening of the first coating portion). {For example, the heating element precursor is positioned below the nozzle of a plunger pump (with the second coating portion facing upwards), and when a liquid component (e.g., water) is ejected from this nozzle, the liquid component is injected into the heating element precursor by the ejection pressure}. Furthermore, if the first coating portion has a vent hole, the liquid component can also be injected through the vent hole of the first coating portion. Through the injection of the liquid component, the liquid component comes into contact with the heating element precursor, and the swelling agent contained in the heating composition swells. As a result, cracks occur in multiple locations of the molded {e.g., pressure-molded (e.g., tableted)} heating element precursor. The above steps describe the manufacturing process of the heating element.

[0140] <3-5. Sealing process of the outer bag S50>

[0141] The sealing process S50 is the process of sealing the heating element, which was manufactured in the liquid component injection process S40, into the outer bag. Here, the outer bag is preferably airtight and substantially oxygen-free (e.g., transparent alumina vapor-deposited polyester, low-density polyethylene, etc.).

[0142] <3-6. Others>

[0143] When an adhesive is provided on the heating element, there may be a process for attaching the adhesive to the heating element (e.g., using a comma coating machine, a gravure coating machine, a hot melt T-die coating machine, etc.) and a process for attaching a release agent to the adhesive (or a process for attaching an adhesive with a release agent to the heating element). Furthermore, as a second coating used in the sealing process S30 of the heating composition precursor, a coating having both an adhesive and a release agent on its surface may also be used.

[0144] [4. Applications]

[0145] The heating element involved in this method can be widely used in medical devices such as warm and moist cloths and meridian stimulation warming devices, or in daily necessities such as disposable heat patches and moxibustion devices.

[0146] Example

[0147] [Manufacturing of heating elements]

[0148] <Preparation of the Precursor for the Heating Composition>

[0149] Iron powder was used as a raw material for the components (non-water-soluble and water-soluble components) that are solid at room temperature as precursors to the heating composition. Co., Ltd., Reduced iron powder "RDH-3M"), activated carbon ( Co., Ltd., wood powder activated carbon "PL-1P"); salts (Nippon Kaisha Co., Ltd., powdered salt "EF-300"); water-absorbing polymers as swelling agents (Sanyo Kasei Corporation, polyacrylic acid resin "ST-500D*"); crystalline cellulose as a binder (Asahi Kasei Chemicals Co., Ltd., crystalline cellulose " TG-101”), α-olefin copolymers as temperature control agents (Toyokuni Oil Co., Ltd., “HS”) -6100P”). Here, 45.0 parts by weight of iron powder, 7.0 parts by weight of activated carbon, 3.5 parts by weight of salts, 30.0 parts by weight of crystalline cellulose, 25.0 parts by weight of temperature control agent, and 5.0 parts by weight of water-absorbing polymer are used as the basic formulation. The measured solid raw materials are sealed in a polyethylene bag, and the bag is sealed and mixed for 3 minutes with sufficient air allowed in. 1.2g of this mixed raw material is measured and processed using a tablet press (Co., Ltd.). The tablets are compressed using a PICCOLA standard tabletop rotary tablet press (compression pressure 10KN). A 13.9mm diameter die is used on the pressing side, and a 14mm inner diameter die is used on the bearing side, to manufacture a cylindrical heating composition precursor with a diameter of 14mm and a thickness of 5mm.

[0150] <Forming of the first covering part>

[0151] Nylon / polyethylene film ( The first cover, with a cup-shaped housing portion having an inner diameter of 21 mm, an outer diameter of 26 mm, and a height of 7 mm, was made by inserting a convex stainless steel mold heated to 110°C and a concave stainless steel support mold that allows cooling air to flow between the mold and the container. The total thickness was 180 μm, which could not be measured (i.e., air permeability > 80,000 seconds / 100 cc). The material was pressed for 4 seconds, and then cooled with air for 4 seconds after 0.5 seconds.

[0152] <Sealing into the Covered Body>

[0153] A heat-generating composition precursor is inserted into the first covering part prepared above, so that the polyester / polyethylene laminated spunbond nonwoven fabric serving as the second covering part ( HST40 Co., Ltd., with a unit area mass of 40 g / m². 2(Ventilation rate = 0.2 seconds / 100cc) Cover the first covered portion from above, covering the opening. Apply pressure (10MPa) for 10 seconds from the partition side using a stainless steel heat-sealing strip heated to 180°C, heat-pressing the second covered portion and the first covered portion at the periphery to seal the precursor of the heating composition. After sealing, use Thomson ( The material was cut to a diameter of 26mm to create the heating element precursor.

[0154] <Injection of liquid components>

[0155] The coating is positioned below the water jet outlet with the surface of the coating facing upwards. A pump (HIBER Corporation) with an inlet inner diameter of 2 mm and an outlet inner diameter of 0.8 mm is used. Water was supplied with a stroke of 4.5 mm. The edge (spray outlet) of a 6 mm diameter polysiloxane buffer member at the top of the metal tube installed on the water inlet head was brought into contact with the attachment surface (second cover side) (non-woven fabric surface of the cover) of the cover containing the precursor of the heating composition manufactured above, and 0.4 g of water was injected into each heating element to manufacture the heating element.

[0156] <Enclosing into the outer bag>

[0157] The resulting heating element was quickly sealed into a transparent alumina vapor-deposited polyester 12μm / low-density polyethylene 40μm outer bag after manufacturing and placed at room temperature.

[0158] (Example 1)

[0159] The heating element of Example 1 was manufactured using the manufacturing method described above.

[0160] (Example 2)

[0161] Except for forming a vent hole (1.0 mm Ф in diameter) at the center of the upper part of the first cover, the heating element of Example 2 was manufactured using the same manufacturing method as in Example 1. Furthermore, as described above, water was injected from the side of the second cover.

[0162] (Example 3)

[0163] A ventilation hole (1.0 mm Ф in diameter) is formed in the center of the upper part of the first covering, and four adhesive bodies are formed on the attachment surface of the second covering {applying four points of paste with a diameter of 4 mm Ф and a thickness of 1 mm (using an iron to press the paste blocks together)} (see reference). Figure 7 The second one from the left in the upper section; 3mm of the paste diameter Ф is positioned at the opening (otherwise, the heating element of Example 3 was manufactured using the same manufacturing method as Example 1). Furthermore, as described above, water was injected from the second covered portion side.

[0164] (Example 4)

[0165] In addition to forming an adhesive body with a coating thickness of 90 μm and a width of 6 mm in the center of the attachment surface of the second coated part (see reference). Figure 7 Except for the fifth one from the left in the upper section, the heating element of Example 4 was manufactured using the same manufacturing method as Example 1.

[0166] (Example 5)

[0167] For the diameter of the first coated part, two vent holes (1mm diameter) are formed at equal intervals, and an adhesive with a coating thickness of 90μm and a width of 6mm is formed in the center of the attachment surface of the second coated part (see reference). Figure 7 (The fifth one from the left in the upper section), except that the heating element of Example 5 was manufactured using the same manufacturing method as Example 1. Furthermore, as described above, water was injected from the second covered portion side.

[0168] (Example 6)

[0169] A vent hole (1 mm diameter) is formed at the center of the upper surface of the first coating, and an adhesive with a coating thickness of 90 μm and a width of 10 mm is formed at the center of the attachment surface of the second coating (see reference). Figure 7 (The fifth one from the left in the upper section), except that the heating element of Example 5 was manufactured using the same manufacturing method as Example 1. Furthermore, as described above, water was injected from the second covered portion side.

[0170] (Example 7)

[0171] A heating composition precursor is placed on an unformed film {a special polyolefin sheet "HUMOFIT" manufactured by Mitsui Chemicals Co., Ltd., with a thickness of 500 μm}, and a polyester / polyethylene laminated spunbond nonwoven fabric is used as the second coating part. HST40 Co., Ltd., with a unit area mass of 40 g / m². 2 A heat-sealing layer (with an air permeability of 0.2 seconds / 100cc) was placed over it. Pressure (10 MPa) was applied from the nonwoven fabric side for 5 seconds using a stainless steel heat-sealing strip heated to 180°C, heat-pressing the second and first covers at their periphery to seal in the heating composition precursor. After sealing, it was cut to a diameter of 26 mm using a Thomson dagger to manufacture the heating element precursor. Then, the heating element of Example 7 was manufactured using the same manufacturing method as in Example 1. Furthermore, as described above, water was injected from the second cover side.

[0172] (Comparative Example 1)

[0173] As the first covering part, non-woven fabric (Asahi Kasei Corporation) is used as a breathable packaging material. Y65230”, as the second covering part, uses an adhesive material (90μm adhesive / 30g / m² PET spunlace nonwoven fabric) as a non-breathable packaging material. 2 (PET film 12μm / PE film 30μm), except that the heating element of Comparative Example 1 was manufactured using the same manufacturing method as in Example 1.

[0174] (Comparative Example 2)

[0175] Iron powder, used as a component of the precursor of the heating composition, The company's "InSIP" uses non-woven fabric as a breathable packaging material as the first covering part. (Asahi Kasei Corporation) Y65230”, as the second covering part, uses an adhesive material (90μm adhesive / 30g / m² PET spunlace nonwoven fabric) as a non-breathable packaging material. 2 (PET film 12μm / PE film 30μm), except that the heating element of Comparative Example 1 was manufactured using the same manufacturing method as in Example 1.

[0176] [Fever Test]

[0177] The heating test was conducted according to the JIS S4100 "Disposable Heating Patches" method, with the heater positioned horizontally. In the heating test, a can-shaped heater (W 615×D 410×H 60mm, using an 8mm thick vinyl chloride sheet) was used, installed in a constant temperature chamber at 20°C and 65% humidity. Warm water was circulated at a rate of 8L / min from a circulating constant temperature water bath attached to the can-shaped heater, maintaining the surface temperature of the heater (vinyl chloride sheet) at 30°C. Each heating element sample was attached to the vinyl chloride sheet on the surface of the heater with the second cover facing down. During attachment, a temperature measuring sensor was attached to approximately the center of the bottom surface of the second cover using double-sided tape, thereby periodically measuring the temperature of the heating element. A KR2S00 graphic recorder manufactured by Chino Corporation was used for temperature measurement, and an ST-22E-005 sensor manufactured by Anritsu Keiki Co., Ltd.

[0178] Here, Table 1 shows the various dimensions of the heating element precursors of the embodiments and comparative examples, and Table 2 shows the volume expansion rate relative to the heating element precursors after water is injected into the heating element precursors of the embodiments and comparative examples.

[0179]

[0180]

[0181] The results are shown in Figures 9-15See Table 3. "Rise time" is defined as the time from exceeding 31.5°C until exceeding 40°C, and "duration" is defined as the time from reaching 40°C until it returns to 40°C.

[0182]

[0183] The heating elements of Examples 1-7 exhibited good heating characteristics. That is, it can be seen that the heating elements of Examples 1-7 have a significantly longer duration of heating compared to the heating elements of Comparative Examples 1 and 2.

[0184] This application is based on Japanese Patent Application No. 2023-97308, filed on June 13, 2023, the contents of which are set forth in the description and claims of Japanese Patent Application No. 2023-97308 are contained in this application.

[0185] Explanation of reference numerals in the attached figures

[0186] 10a Precursor for exothermic composition

[0187] 10b Heating Composition

[0188] 11. Cracks

[0189] 20 Covered body

[0190] 20a 1st covered part

[0191] 20b 2nd covered part

[0192] 21 Above

[0193] 22 below

[0194] 23 Peripheral section

[0195] 24 Storage Department

[0196] 25 Opening

[0197] 26 Ventilation Area

[0198] 30 adhesive

[0199] 40 Vent

[0200] 100 Precursor to heating element

[0201] 200 heating element

Claims

1. A heat generating body precursor, comprising a heat generating composition precursor before addition of a liquid component, and a cover body, the heat generating composition precursor being capable of forming a heat generating composition that generates heat by reacting with oxygen in the air in the presence of the liquid component, the cover body having a first cover portion made of a non-air permeable packaging material, and a second cover portion made of an air permeable packaging material, the first cover portion having a receiving portion capable of receiving the heat generating composition precursor, and an opening portion for introducing the heat generating composition precursor, the second cover portion covering the opening portion in a flat shape.

2. A heat generating body precursor, comprising a heat generating composition precursor before addition of a liquid component, and a cover body, the heat generating composition precursor being capable of forming a heat generating composition that generates heat by reacting with oxygen in the air in the presence of the liquid component, the cover body having a first cover portion made of a non-air permeable packaging material, and a second cover portion made of an air permeable packaging material, the first cover portion having a concave receiving portion capable of receiving the heat generating composition precursor, and an opening portion for introducing the heat generating composition precursor, the second cover portion covering the opening portion in a flat shape.

3. A heat generating body precursor, comprising a heat generating composition precursor before addition of a liquid component, and a cover body, the heat generating composition precursor being capable of forming a heat generating composition that generates heat by reacting with oxygen in the air in the presence of the liquid component, the cover body having a first cover portion made of a non-air permeable packaging material, and a second cover portion made of an air permeable packaging material, the first cover portion having a first receiving portion capable of receiving the heat generating composition precursor and having a first depth, and an opening portion for introducing the heat generating composition precursor, the second cover portion covering the opening portion and having a second receiving portion having a second depth different from the first depth.

4. A heat generating body precursor, comprising a heat generating composition precursor before addition of a liquid component, a first cover portion made of a non-air permeable packaging material having a deformability, and a second cover portion made of an air permeable packaging material, the heat generating composition precursor being capable of forming a heat generating composition that generates heat by reacting with oxygen in the air in the presence of the liquid component, the heat generating composition precursor being received between the first cover portion and the second cover portion in a state where the first cover portion is deformed by the heat generating composition precursor.

5. The heat generating body precursor according to any one of claims 1 to 4, the first cover portion having at least one air hole.

6. The heat generating body precursor according to any one of claims 1 to 4, the heat generating composition precursor containing a swelling agent capable of absorbing the liquid component, the swelling agent being capable of swelling in the receiving portion when the liquid component is absorbed.

7. The heat generating body precursor according to any one of claims 1 to 4, a ratio of a volume of the heat generating composition precursor to a volume of the receiving portion being 0.2 or more.

8. The heat generating body precursor according to any one of claims 1 to 4, When the second covering portion faces the heating target, air is introduced from a gap between the second covering portion and the heating target to the opening portion.

9. The heat generator precursor according to any one of claims 1 to 4, Further comprising an adhesive applied to the second covering portion and overlapping a portion of the opening portion.

10. A heat generator into which the liquid component is introduced via the second covering portion in the receiving portion of the heat generator precursor according to any one of claims 1 to 4.

11. The heat generator according to claim 10, The heat generating composition precursor is in a solid form, By the liquid component being introduced into the receiving portion, the heat generating composition precursor in the solid form becomes the heat generating composition in a form in which cracks are generated.

12. The heat generator according to claim 10, The time during which the heat generating temperature is 40°C or higher exceeds 20 minutes.

13. The heat generator according to claim 10, By swelling of the heat generating composition precursor, at least a portion of the second covering portion bulges outward.

14. A moxibustion device comprising the heat generator according to claim 10.

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