WO2020148966A1

WO2020148966A1 - Heating tool

Info

Publication number: WO2020148966A1
Application number: PCT/JP2019/042198
Authority: WO
Inventors: 穂貴高桑
Original assignee: 花王株式会社
Priority date: 2019-01-15
Filing date: 2019-10-28
Publication date: 2020-07-23
Also published as: TW202034868A; KR102609047B1; KR20210057135A; JP7328258B2; CN113301871A; TWI735065B; JPWO2020148966A1

Abstract

This heating tool (1) has a heating layer (31) provided on one surface of a substrate sheet (37), wherein: the heating layer (31) comprises a mixture (3M) of oxidizable metal particles, an electrolyte, a carbon material, and water; and one or more first slits (S1) which are linear or arc-shaped slits are formed on the heating layer (31) and the substrate sheet (37). The heating tool (1) has a group of the one or more first slits (S1) which are linear slits, preferably such that one row or more of first slit rows (L1) in which the slits (S1) are arranged extending in one direction are formed on the heating layer (31) and the substrate sheet (37) so as not to intersect with one another. The heating tool (1) also preferably has the one or more first slits (S1) which are arc-shaped slits, and preferably has a plurality of the arc-shaped first slits (S1) formed on the same circumference or in concentric arcs on the heating layer (31) and the substrate sheet (37).

Description

Heating equipment

The present invention relates to a heating tool.

The applicant has previously proposed an eye heating device that applies heat to the eyes and the surroundings of the eyes (see Patent Document 1). The eye heating device includes an eye mask-shaped main body, and the main body has a skin-side sheet, an outer sheet, and a sheet-shaped heating element arranged between them. The sheet-shaped heating element is formed with a plurality of slits extending in one direction, which facilitates the deformation of the sheet-shaped heating element. As a result, the eye heating device is deformed to fit the curved shape of the face, the fitting property is improved, and the feeling of use is improved. The sheet-shaped heating element included in the eye heating device can be manufactured, for example, by a method using papermaking.

In addition to this, the applicant has proposed a heating tool including a heating element in which a layer of a heating composition containing particles of an oxidizable metal, a carbon component, water and an electrolyte is applied to a base sheet. (Patent Document 2). In this heating tool, a feeling of wearing the heating tool is improved by providing a slit in a heating element manufactured by a coating method.

JP, 2009-82570, A JP, 2013-94171, A

The present invention relates to a heating tool having a heating layer provided on one surface of a base material sheet.
In one embodiment, in the heating device of the present invention, the heating layer includes a mixture of particles of an oxidizable metal, an electrolyte, a carbon material, a fiber material, and water.
In one embodiment, in the heating tool of the present invention, one or more first slits formed by linear or arcuate cuts are formed in the heating layer and the base sheet.

FIG. 1 is a plan view showing an embodiment of a heating tool of the present invention. FIG. 2 is an exploded perspective view of the heating tool shown in FIG. FIG. 3 is a cross-sectional view of the heating device shown in FIG. 1 along the longitudinal direction. FIG. 4 is a sectional view showing an embodiment of the heating element shown in FIG. FIG. 5 is a plan view showing an arrangement of slits formed in the heat-generating body shown in FIG. FIGS. 6A to 6F are plan views showing another arrangement mode of the slits formed in the heat-generating body shown in FIG. FIGS. 7A to 7D are plan views showing still another arrangement mode of the slits formed in the heat-generating body. 8A and 8B are cross-sectional views showing another embodiment of the heating element shown in FIG. 9A and 9B are cross-sectional views showing still another embodiment of the heating element shown in FIG. 10A and 10B are cross-sectional views showing still another embodiment of the heating element shown in FIG. 11A and 11B are sectional views showing still another embodiment of the heating element shown in FIG. 12A and 12B are sectional views showing still another embodiment of the heating element shown in FIG. FIG. 13: is a top view which shows another embodiment of the heating tool of this invention. FIGS. 14A and 14B are plan views showing still another arrangement mode of the slits formed in the heat-generating body. FIG. 15 is a plan view showing still another arrangement mode of the slits formed in the heat-generating body.

Detailed Description of the Invention

The heating tool described in Patent Document 1 has high fitness because the slits are formed in multiple lines, but the heating tool including a heating element manufactured by a papermaking method is a coating method. There is a problem that the heat generation characteristics are inferior as compared with a heating tool including a heating element manufactured in 1.

Also, the heating tool described in Patent Document 2 has a heating element manufactured by a coating method, so that the heating characteristics are good. However, the heating element produced by this coating method does not contain fibers. Therefore, it is difficult to obtain favorable effects such as water retention, moldability, and shape retention due to the particles of the oxidizable metal being supported between the fibers, as compared with a heating element produced by a papermaking method.

When the present inventor uses a heating element containing fibers such as a heating element produced by a papermaking method, the heating element has a low water absorption capacity of the fibers contained in the heating element, and thus is oxidizable. It was speculated that the oxidation reaction between the metal and oxygen was hindered, and as a result, good heat generation characteristics could not be obtained. Therefore, the present inventor diligently studied the improvement of the heat generation characteristics of a heating tool including a heating element containing fibers such as a heating element manufactured by a papermaking method, and forming a slit of a specific aspect in the heating element. Oxygen can be sufficiently supplied to the oxidizable metal through the slit, and the heat generation characteristics can be improved to a level equivalent to that of a heating tool including a heating element manufactured by a coating method, and the fitting of the heating tool can be achieved. It has been found that the performance can be improved.

The present invention relates to a heating tool that has both improved fit and improved heat generation characteristics.

Hereinafter, the present invention will be described based on its preferred embodiments with reference to the drawings. FIG. 1 shows an embodiment of the heating tool of the present invention. The warming tool 1 shown in the figure is of a so-called eye mask type, and is used to bring the water vapor heated to a predetermined temperature into contact with the eyes of a human so as to cover the eyes and heat the eyes and its surroundings. Is used.

As shown in FIG. 1, the heating tool 1 includes a main body 2 that is long in the lateral direction X and has a shape that covers both eyes of the user during use, a heating element 3 provided in the main body 2, and a pair of ear hooks. And

parts

4 and 4. The ear hooks 4 are provided at both outer end regions of the main body 2 in the lateral direction X, and can be inverted toward the outside in the lateral direction X. As a result, the

ear hooks

4 and 4 can be hooked on the user's ears, respectively, and the state in which the body 2 covers both eyes of the user can be maintained. The longitudinal direction of the main body 2 coincides with the lateral direction X of the heating tool. That is, the horizontal direction X of the heating tool 1 and the horizontal direction X of the main body 2 are coincident with each other. In the following description, the lateral direction of each member will be described as a direction coinciding with the lateral direction X of the heating tool 1.

FIG. 2 shows an exploded perspective view of the heating tool 1. Further, FIG. 3 shows a cross-sectional view of the heating tool 1 along the lateral direction X (longitudinal direction). The main body 2 of the heating tool 1 shown in these figures includes a first sheet 5 located on the side closer to the user's skin and a second sheet 6 located on the side farther from the user's skin. That is, the upper side in the figure is the side closer to the user's skin, and the lower side in the figure is the side far from the user's skin.

The first sheet 5 and the second sheet 6 shown in FIGS. 2 and 3 are bonded to each other with an adhesive 7 such as a hot-melt adhesive in a state where they are overlapped with each other. The two

heating elements

3 and 3 can be held separately.

The ear hook 4 shown in FIG. 2 is made of a sheet material, and an insertion portion 4A extending in the lateral direction X is formed on the sheet material. The insertion portion 4A is a hole for passing the ear when the ear hook 4 is hooked on the ear. Instead of this, the insertion portion 4A may be formed by a through slit or the like through which the ear can be inserted. As shown in FIG. 2, the ear hooking portion 4 is joined to the outer surface of the first sheet 5 in the main body portion 2 at both outer end regions of the heating tool 1 in the lateral direction X, whereby the main body portion 2 and A joint region 9 is formed in which the ear hook 4 is joined. The joining region 9 is formed by joining the first sheet 5 and the ear hook 4 in the main body 2 continuously or discontinuously in the surface direction. The joint region 9 also functions as a bent portion when the ear hook 4 is inverted with the joint end 9s as an axis. The bonding region 9 may be formed by fusion bonding the main body 2 and the ear hook 4 such as heat sealing, or may be formed by ultrasonic bonding such as ultrasonic sealing.

The cross-sectional view shown in FIG. 3 shows a fixed state of the heating element 3 formed by accommodating the sheet-shaped heat generating main body 3A in the bag body. The heating element 3 shown in FIG. 1 includes a skin-side sheet 32, which is located on the side close to the user's skin when the heating element 1 is worn by the heat-generating body 3A, and a user's skin when the heating element 1 is worn. It is arranged between the non-skin side sheet 33 located on the side far from the skin. More specifically, the skin-side sheet 32 and the non-skin-side sheet 33 shown in the figure are continuously formed with a peripheral edge joint portion 35 in which the peripheral edge portions thereof are joined to each other, and are located inside the peripheral edge joint portion 35. In the portion, the skin side sheet 32 and the non-skin side sheet 33 are in a non-bonded state to form a bag body. In this way, the skin side sheet 32 and the non-skin side sheet 33 are joined to form a bag body, and the heat-generating main body 3A is housed in the bag body. In the embodiment shown in FIG. 3, the heating element 3 is formed by accommodating the sheet-shaped heat-generating main body 3A in a flat packaging material having one surface made of the skin side sheet 32 and the other surface made of the non-skin side sheet 33. Has been done.

Next, the basic structure on which the heating element 3 used in the present invention is based will be described with reference to FIGS. 4(a) and 4(b). An enlarged view of the heating element 3 is shown in FIGS. In the heating element 3 shown in the figure, the heat-generating main body 3A is arranged between the skin side sheet 32 and the non-skin side sheet 33. The heat generating body 3A in the heat generating element 3 shown in the figure includes at least a heat generating layer 31 and a base material sheet 37, and the heat generating layer 31 is provided on one surface of the base material sheet 37. The heat generating layer 31 contains a mixture 3M containing particles of an oxidizable metal, an electrolyte, a carbon material and water. The heat generating layer 31 does not include a fiber material. The mixture 3M can generate heat due to the oxidation reaction with oxygen. The heat generating layer 31 may exist only on the base material sheet 37, or even if the heat generating layer 31 exists on the base material sheet and the lower part of the heat generating layer 31 is buried in the base material sheet 37. Good. The heat generating main body 3A shown in FIG. 4A is formed of a heat generating layer 31 and a base material sheet 37. If necessary, as shown in FIG. 4B, the heat-generating main body 3A has the same or different material or composition as the base sheet 37 on the surface side of the heat generating layer 31 on which the base sheet 37 is not arranged. The second base material sheet 38 formed in step 1 may be further arranged. Instead of or in addition to this, a water-absorbing sheet or the like containing a water-absorbing material described later may be further arranged.

In the heat-generating body 3A configured as the basic structure of the heat-generating body 3, the heat-generating layer 31 may be in the form of, for example, a paste material, a powder composition, or a sheet material. More specifically, as a mode of the heating element 3, (i) a paste-like heating layer 31 having fluidity that does not fall off the base material sheet 37 is applied to one surface of the base material sheet 37. A form including the heat-generating main body 3A (hereinafter, this form is also referred to as “application type”), and (ii) a powdery mixture 3M in which a skin side sheet 32 and a non-skin side sheet 33 are joined together. A form that is movable in the body (hereinafter, this form is also referred to as "powder type"), or (iii) a form in which the mixture 3M itself is formed into a sheet shape (hereinafter, this form is also referred to as "sheet type"). I say.) etc. That is, the heating element manufactured by the above-mentioned coating method is classified into the "coating type", and the heating element manufactured by the paper-making method is classified into the "sheet type".

The heat-generating body 3A shown in FIG. 4(a) is formed of the heat-generating layer 31 and the base material sheet 37 as described above. In the heat-generating main body 3A shown in the figure, a plurality of slits S1 each having a notch through which the heat-generating layer 31 and the base material sheet 37 penetrate in the thickness direction Z are formed. In a plan view of the heat-generating main body 3A, the heat-generating layer 31 and the base sheet 37 are formed at the same position of the slit S1. That is, the slit S1 is formed at the same position on both the heat generating layer 31 and the base material sheet 37 in the plan view of the heat generating main body 3A. The form of the slits S1 is not limited to this, and some or all of the slits S1 may be formed by notches that penetrate the heating layer 31 in the thickness direction Z and do not penetrate the base material sheet 37 in the thickness direction Z. .. The respective forms of the slit S1 described above may be present in combination.

Further, in the heat-generating main body 3A shown in FIG. 4(b), a plurality of slits S1 each having a notch penetrating through the heat-generating layer 31 and each of the

base material sheets

37 and 38 in the thickness direction Z are formed. .. As shown in the figure, in the plan view of the heat-generating main body 3A, the formation positions of the slits S1 of the heat-generating layer 31 and the respective

base material sheets

37, 38 are the same. That is, the slit S1 is formed at the same position on all of the heat generating layer 31 and each of the

base material sheets

37 and 38 in the plan view of the heat generating main body 3A. The form of the slit S1 is not limited to this. For example, (1) some or all of the slits S1 penetrate one of the two

base material sheets

37, 38 in the thickness direction Z, and the heating layer 31 in the thickness direction. One of the

base material sheets

37, 38 is formed by a notch that does not penetrate the Z, and the other of the

base material sheets

37, 38 has no notch, (2) some or all of the slits S1 A mode in which one of the

base material sheets

37 and 38 is formed by a notch which penetrates one of the

base material sheets

37 and 38 in the thickness direction Z and also penetrates the heat generating layer 31 in the thickness direction Z, (3) Part Alternatively, all the slits S1 penetrate one of the

base material sheets

37 and 38 and the heat generating layer 31 in the thickness direction Z, and the other of the

base material sheets

37 and 38 does not penetrate in the thickness direction Z. A form in which a notch is formed or a combination of the forms of the slit S1 described above can be mentioned.

From the viewpoint of making both the fit property and the heat generation property more excellent, the form of the slit S1 described above is a slit S1 formed by a notch that penetrates all the constituent members of the heat generating main body 3A in the thickness direction Z. Is more preferable. That is, it is more preferable to adopt the form of the slit S1 shown in FIGS. 4(a) and 4(b).

The particles of the oxidizable metal contained in the heat generating layer 31 include particles of iron, aluminum, zinc, manganese, magnesium, calcium and the like. The particle size of the particles of the oxidizable metal can be, for example, about 0.1 μm or more and 300 μm or less. As the electrolyte, an electrolyte capable of dissolving the oxide formed on the surface of the particles of the oxidizable metal is used. Examples thereof include alkali metal, alkaline earth metal or transition metal sulfates, carbonates, chlorides or hydroxides. Among them, conductivity, chemical stability, at least one of alkali metal, alkaline earth metal or transition metal chlorides is preferably used from the viewpoint of excellent production cost, and sodium chloride, potassium chloride, calcium chloride, chloride At least one of magnesium, ferrous chloride and ferric chloride is more preferably used. As the carbon material, it is preferable to use a carbon material that not only functions as a water retention agent but also has a function as an oxygen retention agent and a supply agent to the oxidizable metal. Examples of the carbon material include activated carbon (coconut shell charcoal, charcoal powder, almond blue charcoal, peat, lignite), carbon black, acetylene black, graphite and the like.

The base sheet 37 has a basis weight of preferably 10 g/m ² or more, more preferably 35 g/m ² or more, and preferably 200 g/m ² or less, from the viewpoint of ensuring sufficient sheet strength. It is preferably 150 g/m ² or less. The basis weight of the oxidizable metal in the heat generating layer 31 is preferably 100 g/m ² or more, more preferably 200 g/m ² or more, and preferably 3000 g/m ² from the viewpoint of ensuring a sufficient heat generation amount. Or less, more preferably 1500 g/m ² or less. When the second base material sheet 38 is used, its basis weight is preferably in the same range as the base material sheet 37.

From the viewpoint of improving heat generation sustainability, the amount of the electrolyte in the heat generating layer 31 is, as a basis weight, preferably 4 g/m ² or more, more preferably 5 g/m ² or more, and preferably 80 g/m ² or less. , More preferably 40 g/m ² or less, still more preferably 30 g/m ² or less. From the same viewpoint, the amount of the carbon material in the heat generating layer 31 is, as the basis weight, preferably 4 g/m ² or more, more preferably 8 g/m ² or more, and preferably 300 g/m ² or less, more preferably Is 80 g/m ² or less, more preferably 50 g/m ² or less. These basis weights are values when the heat generating layer 31 is formed on one surface of the base material sheet 37.

As mentioned above, the heat generating layer 31 is in a water-containing state. The water content of the heat generating layer 31 is preferably 5% by mass or more, more preferably 10% by mass or more, and preferably 45% by mass or less, more preferably 35% by mass or less. By setting the water content of the heat generating layer 31 within this range, it is possible to form slits in the heat generating layer 31 in addition to the base material sheet 37, and as a result, the fit property and heat generating property are excellent. .. For the water content of the heat generating layer 31, the heat generating layer 31 is taken out in a nitrogen environment and its mass is measured. Water is removed from the heat generating layer 31 in a drying oven at 105° C. for 2 hours in vacuum, the mass is measured again, and the water content is measured from the difference between the masses. The water content of the heat generating layer is a value per one heat generating layer.

FIGS. 5A and 5B show an embodiment of the slit S1 formed in the heat generating layer 31 and the base material sheet 37 that form the heat generating main body 3A. As shown in the drawing, a group of one or a plurality of first slits S<b>1 formed of linear cuts extending in one direction in a plan view is formed on both the heat generating layer 31 and the base sheet 37. The 1st slit S1 is intermittently arrange|positioned so that it may extend along the 1st direction Y, and forms the 1st slit row L1. The first slit row L1 shown in FIG. 5A is arranged in a plurality of rows in a second direction X orthogonal to the first direction Y and is formed so as not to intersect with each other. 2 and 5(a), the first direction Y in which the slit S1 extends and the vertical direction Y of the heating tool 1 coincide with each other, and the second direction X and the lateral direction of the heating tool 1 coincide with each other. X matches. Instead of this, as shown in FIG. 5B, the first slit row L1 intersects both the vertical direction Y and the horizontal direction X of the heating tool 1, and both the vertical direction Y and the horizontal direction X. It may be formed so as not to be orthogonal to. The first slit row L1 shown in FIG. 5(b) is arranged in a plurality of rows and is formed so as to be inclined in both the vertical direction Y and the horizontal direction X of the heating tool 1 so as not to intersect with each other. In addition, the vertical direction Y is a direction orthogonal to the horizontal direction X, and in the following description, the vertical direction of each member will be described as a direction coinciding with the vertical direction Y of the heating tool 1.

As an embodiment different from the embodiment shown in FIGS. 5(a) and 5(b), the embodiment shown in FIGS. 6(a) to 6(f) can be adopted. In the present embodiment, the one or more first slits S1 formed of linear cuts or arcuate cuts serve as the heat generating layer 31 in the heat generating main body 3A and at least one of the

base material sheets

37 and 38. It is formed in. As an arrangement form of the slits S1 formed of linear cuts, in addition to the embodiment shown in FIGS. 5A and 5B, as shown in FIG. 6A, the linear slits S1 are arranged in one direction. A form in which one slit is formed to extend, as shown in FIG. 6B, a plurality of linear slits S1 are formed, and one row of first slit rows in which the slits S1 are arranged to extend in one direction A form in which L1 is formed, or a form in which a plurality of linear slits S1 are formed as shown in FIG. 6C, and these slits are arranged in parallel in the same direction, etc. Are listed. As a form of the slit S1 formed of an arcuate cut, for example, a form in which one arcuate slit S1 is formed as shown in FIG. 6D, or an arcuate form as shown in FIG. 6E. A plurality of slits S1 are formed and these slits S1 are present so as to be located on the same circumference, or as shown in FIG. 6(f), a plurality of arcuate slits S1 are formed, In addition, there may be mentioned a form in which these slits S1 are present so as to be positioned in two or more concentric circles. In FIGS. 6E and 6F, the symbol CF indicates the circumference of the virtual circle, and the symbol CC indicates the center of the virtual circle.

The length W1 of the first slit S1 (see FIG. 5(a)) is preferably 1 mm or more, more preferably 4 mm or more, from the viewpoint of improving the fitting property of the heating tool and improving the heat generation characteristics. Further, it is preferably 50 mm or less, more preferably 40 mm or less. The distance W2 (see FIG. 5A) between the first slits S1 in the first slit row L1 is preferably 0.5 mm or more, more preferably 1 mm or more, and preferably 20 mm or less, More preferably, it is 10 mm or less. The length W1 of the first slit S1 and the distance W2 between them may be the same or different.

Similarly, from the viewpoint of improving the fitting property of the heating tool and improving the heat generation characteristics, the interval W3 between the first slit rows L1 (see FIG. 5(a)) is preferably 4 mm or more, and more preferably 8 mm. Above, it is preferably 25 mm or less, more preferably 15 mm or less. The interval W3 between the first slit rows L1 may be the same or different.

From the viewpoint of improving the fitting property of the heating tool and improving the heat generation characteristics, the number of rows of the first slit row L1 is preferably 1 row or more, more preferably 2 rows or more, and further preferably 3 rows or more. Also, it is preferably 10 rows or less, more preferably 5 rows or less.

Among the embodiments shown in FIGS. 5(a) and 5(b) and FIGS. 6(a) to 6(f), from the viewpoint of further improving the fit property and the heat generation characteristic, a slit formed by a linear cut extending in one direction is formed. In this case, one of the slits shown in FIGS. 5A and 5B and FIGS. 6A to 6C is preferable, and FIGS. 5A and 5B and 6 Any one of the slits shown in FIGS. 5B and 5C is more preferable, and one of the slits shown in FIGS. 5A and 5B is further preferable. Further, in the case of forming a slit formed by an arcuate cut, one of the slits shown in FIGS. 6(d) to 6(f) is preferable, and the slits shown in FIGS. 6(e) to 6(f) are preferable. Any one of the above forms is more preferable, and the form of the slit shown in FIG. 6(f) is further preferable.

The sheet material that can be used for the heating element 3, the ear hook 4, the first sheet 5, and the second sheet 6 has breathability, moisture permeability, texture, stretchability, strength, and composition of the heating sheet and the heating composition. It may be appropriately determined in consideration of properties such as leakage prevention of the material, and for example, non-woven fabric, woven fabric, paper, resin film, or a combination thereof is used. Examples of the sheet material having high air permeability and preventing leakage of a heat generating sheet and the like include melt blown nonwoven fabric, paper and moisture permeable film, and these are used alone or in combination, and the skin side sheet 32 and the non-skin side sheet 33 are used. , And each of the

base material sheets

37 and 38. As the sheet material used for the purpose of imparting strength, spunbonded nonwoven fabric is preferably used. A thermal bond nonwoven fabric is preferably used as the sheet material used for improving the texture. As the sheet material used for the purpose of exhibiting elasticity, for example, an air-through nonwoven fabric or a spunbonded nonwoven fabric containing a synthetic fiber such as polyester such as polyethylene terephthalate, polyethylene or polypropylene is used. In addition to the above-mentioned non-woven fabric, a non-woven fabric surface-treated with silicone, a surfactant or the like may be used. Further, these sheet materials can be combined to exhibit desired properties. In particular, it is preferable that both the first sheet 5 and the skin-side sheet 32 are made of highly breathable sheet material from the viewpoint of making the user feel warmth and improving the feeling of use caused by the warmth.

When a breathable sheet material is used, the air permeability of the first sheet 5 is preferably lower than that of the second sheet 6. Specifically, the air permeability of the first sheet 5 is preferably 0.01 seconds/100 mL or more, more preferably 50 seconds/100 mL or more, and further preferably 2000 seconds/100 mL or more. Further, it is preferably 15000 seconds/100 mL or less, more preferably 10000 seconds/100 mL or less. Further, the air permeability of the second sheet 6 is preferably as high as possible, specifically, 50 seconds/100 mL or more is preferable, 4000 seconds/100 mL or more is more preferable, and 20000 seconds/100 mL or more. Is more preferable, and a non-ventilated sheet is more preferable. The air permeability is measured by the method described in JIS P8117. A large air permeability means that it takes a long time for air to pass, so it means that the air permeability is low. .. Comparing the first sheet 5 and the second sheet 6 with respect to air permeability, the air permeability of the first sheet 5 is higher than that of the second sheet 6. Further, when the heating element 3 is configured as a bag body in which a plurality of sheet materials are combined, the sheet material arranged on the first sheet 5 side of the heating element 3 is arranged on the second sheet 6 side of the heating element 3. It is also preferable that the air permeability is lower than that of the sheet material. That is, the air permeability of the skin side sheet 32 is preferably lower than the air permeability of the non-skin side sheet 33.

When a moisture permeable material is used as the sheet material, the moisture permeability of the first sheet 5 is preferably 2000 g/(m ² ·24 h) or more, more preferably 2500 g/(m ² ·24 h) or more, More preferably, it is 3000 g/(m ² ·24 h) or more. The water vapor transmission rate of the second sheet 6 may be the same as the water vapor transmission rate of the first sheet 5, or may be higher or lower than the water vapor transmission rate of the first sheet 5. With such a configuration, the user can easily perceive the heat. The water vapor permeability is measured according to JIS Z0208. The moisture permeability of the skin-side sheet 32 and the non-skin-side sheet 33 can be the same as that of the first sheet 5 and the second sheet 6.

When non-woven fabric is used as the first sheet 5 and the second sheet 6, the basis weight of the second sheet 6 is preferably larger than the basis weight of the first sheet 5. The basis weight of the first sheet 5 is preferably 10 g/m ² or more, more preferably 20 g/m ² or more, and preferably 200 g/m ² or less and 130 g/m ² or less. Is more preferable. The basis weight of the second sheet 6 is preferably 10 g/m ² or more, more preferably 30 g/m ² or more, and preferably 200 g/m ² or less, 150 g/m 2. It is more preferably ² or less. The skin-side sheet 32 and the non-skin-side sheet 33 can have the same basis weight as the first sheet 5 and the second sheet 6.

According to the heating tool of the present invention having the above-described configuration, since the first slit S1 is formed in the heat generating layer 31 and at least one of the

base material sheets

37 and 38, the oxidizable metal Even when the heat generating layer 31 is hardened due to oxidation, the flexibility of the heat generating main body 3A can be maintained, and as a result, the fit to the eyes is improved. Further, since the first slit S1 is formed in the heat generating layer 31 and at least one of the

base material sheets

37 and 38, the oxidation reaction caused by the contact between the heat generating layer 31 and oxygen in the air. Since it is easy to proceed, the time until heat is generated to a desired temperature can be shortened, and as a result, the heat generation characteristics such as the rising speed of heat generation when the heating tool is used are excellent.

Further, in a preferred embodiment of the present invention, by providing the heat-generating body 3A with a slit S1 formed by a notch penetrating in the thickness direction Z, flexibility of the heat-generating body 3A is increased, and oxygen supply to the heat-generating layer 31 is increased. Can be performed more effectively, and the eye fit and the heat generation characteristics when the heating tool is used are further improved. In addition to this, since the first slit row L1 in which the plurality of slits S1 are intermittently arranged is formed, the heat-generating main body 3A is not completely divided into individual parts, and the storage state (not There is also an advantage that the deterioration of the heating element in the usage state) is reduced.

From the viewpoints of further improving the fit of the heating tool to the eyes and further improving the heat generation characteristics, the heat generating main body 3A includes the first slit row as shown in FIGS. 7(a) to (d). In addition to L1, it is preferable to have a second slit row L2 formed so as to extend in a direction intersecting with the slit row L1. The second slit row L2 shown in FIGS. 7A to 7D is, like the first slit row L1, a plurality of linear second slits that are not penetrated or penetrated in the thickness direction. The groups of S2 are arranged intermittently so as to extend along the lateral direction X. The second slit rows L2 are arranged in a plurality of rows along the vertical direction Y so that the slit rows L2 do not intersect each other. The slit rows L1 and L2 shown in FIGS. 7A to 7D are orthogonal to each other. Although the slits S1 and S2 shown in FIGS. 7A to 7D do not intersect each other, some or all of them may intersect.

Also, the second slit row L2 may be formed in only one row similarly to the first slit row L1. Further, the second slit S2 is formed with a plurality of linear slits S2 as in the case of the first slit S1 shown in FIGS. 6B and 6C so that the slits S2 extend in one direction. The second slit row L2 arranged in one row is formed, or a plurality of linear slits S2 are formed, and the slits S2 are formed in parallel in the same direction. It can be in the form.

From the viewpoint of further improving the fitability and heat generation characteristics of the heating tool, the slits S1 and S2 and the slit rows L1 and L2 formed in the heat generation layer 31 and the base material sheet 37 that form the heat generation main body 3A are respectively formed. More preferably, they are formed so as to have a predetermined arrangement. Specifically, as shown in FIG. 7A, the first slit S1 and the second slit S2 are arranged so that the first slit S1 and the second slit S2 do not intersect with each other. Is more preferable. As shown in the figure, the first slits S1 and the second slits S2 are arranged in a grid pattern, and an area including an intersection of the first slit row L1 and the second slit row L2 generates heat. The layer 31 and the base material sheet 37 are non-divided regions 3N which are not divided by the cuts. The non-separated region 3N is located between the first slit non-forming region located between the first slits S1 adjacent to each other in the first slit line L1 and the second slit S2 adjacent to the second slit line L2. The second slit non-formation region is formed.

From the viewpoint of further improving the fitting property and the heat generation property of the heating tool, as shown in FIGS. 7B and 7C, the first slit S1 and the second slit S2 should not intersect with each other. In addition to being formed, the first slit S1 in the first slit row L1 passes between the two second slits S2 adjacent to each other in the second slit row L2 so as to pass through the first slit S1. It is further preferable that the first slit S1 and the second slit S2 are arranged. In the arrangement shown in FIG. 7B, the length of the first slit S1 is formed shorter than the length of the second slit S2, and the second slits S2 adjacent to each other in the column direction are provided with the first slit S1. One slit S1 is designed to pass through. Further, in the arrangement form shown in FIG. 7C, the length of the first slit S1 is substantially the same as the length of the second slit S2, and the first slit row L1 formed in the adjacent first slit row L1 is formed. The slit rows L1 have the same pitch, and the phases are shifted by a half pitch, and the slits S1 and S2 have a staggered lattice shape. "Adjacent to each other in the front-back direction" refers to being adjacent to each other along the arrangement direction of the slits in the slit row.

Further, from the viewpoint of further improving the fitability and heat generation characteristics of the heating tool, as shown in, for example, FIGS. 7B, 7C, and 7D, the first slit row L1 is adjacent to the front and rear sides. It is even more preferable that the first slit S1 and the second slit S2 are arranged so that the second slit S2 in the second slit row L2 does not pass between the two first slits S1. .. In order to have such a configuration, for example, as shown in FIG. 7B, the pitch of the slits in the adjacent slit rows is the same, and the length of one slit is shorter than the length of the other slit. Alternatively, as shown in FIG. 7(c), the phase of one slit may be different between adjacent slit rows, or as shown in FIG. 7(d), the pitch of slits in adjacent slit rows may be the same. It can be formed by making the length of one slit longer than the length of the other slit.

In any of the arrangements shown in FIGS. 7A to 7D, the first direction Y in which the slit S1 extends and the longitudinal direction Y of the heating tool 1 coincide with each other, and the second direction in which the slit S2 extends. Direction X and the lateral direction X of the heating tool 1 coincide with each other. Thereby, the extending direction of the first slit row L1 coincides with the longitudinal direction Y of the heating tool 1, and the extending direction of the second slit row L2 coincides with the lateral direction X of the heating tool 1. Instead, each of the slit rows L1 and L2 is inclined so as to intersect both the horizontal direction X and the vertical direction Y of the heating tool 1 and not intersect with both the horizontal direction X and the vertical direction Y of the heating tool 1. It may be formed. Further, each of the slit rows L1 and L2 may be arranged in a plurality of rows, and may be formed to be inclined with respect to both the horizontal direction X and the vertical direction Y of the heating tool 1 so as not to intersect with each other. Even if each of the slit rows L1 and L2 is formed to be inclined, the effect of the present invention is sufficiently exhibited.

The first slit row L1 extending along the vertical direction Y of the heating tool 1 is a first slit row so that the heating element 3 covers the eyes of the user and the periphery thereof when the heating tool 1 is mounted. It will bend around L1. Due to the bending of the heating element 3 when the warming tool 1 is used, the contact area between the heat generating layer 31 and oxygen in the air increases, and in addition to improving the fit of the warming tool itself, the rising speed of heat generation, etc. The heat generation characteristics are further improved. As described above, from the viewpoint of making the heat generation characteristics due to the bending of the heating element 3 during mounting particularly excellent, the first slit S1 in the first slit row L1 extending along the longitudinal direction Y of the heating tool 1 is formed. Is more preferably longer than the length W4 of the second slit S2 in the second slit row L2 extending along the lateral direction X of the heating tool 1. That is, from the viewpoint of improving heat generation characteristics, the slit form shown in FIG. 7(b) is more preferable, and the slit form shown in FIG. 7(a) or (c) is further preferable, and FIG. It is more preferable that the slit shape shown in FIG.

From the viewpoint of improving the fitting property of the heating tool and improving the heat generation characteristics, the length W4 (see FIG. 7A) of the second slit S2 is preferably 2 mm or more, more preferably 4 mm or more, Further, it is preferably 40 mm or less, more preferably 30 mm or less. The distance W5 (see FIG. 7A) between the second slits S2 in the second slit row L2 is preferably 0.5 mm or more, more preferably 1 mm or more, and preferably 10 mm or less, It is more preferably 5 mm or less. The length W4 of the second slit S2 and the distance W5 between them may be the same or different.

From the viewpoint of improving the fitting property of the heating tool and improving the heat generation characteristics, the interval W6 between the second slit rows L2 (see FIG. 7A) is preferably 4 mm or more, more preferably 8 mm or more. Also, it is preferably 20 mm or less, more preferably 15 mm or less. The interval W6 between the first slit rows L1 may be the same or different.

The number of rows of the second slit row L2 is preferably 1 row or more, more preferably 2 rows or more, and further preferably 4 rows or more, from the viewpoint of improving the fitting property of the heating tool and the heat generation characteristics. Further, it is preferably 7 columns or less, more preferably 5 columns or less.

The above is the description regarding the arrangement form of the slits formed in the heat generating layer 31 and the base material sheet 37. Hereinafter, regarding the embodiment of the heat generating element 3 used in the present invention, that is, the heat generating element 3 including the fiber material. Will be described with reference to FIGS. In the following embodiments, only points different from the above-described embodiments will be described, and the same points as those in the above-described embodiments will be denoted by the same reference numerals and description thereof will be omitted.

8A and 8B are cross-sectional views showing an embodiment of the heating element 3 used in the present invention. As shown in the figure, it is preferable that the heat generating layer 31 in the heat generating element 3 further includes the fiber material 3F. That is, the heat generation layer 31 is preferably a mixture containing the fiber material 3F in addition to the particles of the oxidizable metal, the electrolyte, the carbon material, and water. Since the heat generating layer 31 contains the fiber material 3F, the water retaining property, the moldability, and the shape retaining property of the heat generating element 3 are improved. Further, since voids are likely to be generated in the heat generating layer 31, the oxidation progresses earlier with the increase of the oxygen supply to the heat generating layer 31, and as a result, the heating tool having a high rising rate of heat generation and excellent heat generating characteristics. Becomes

The heat generating layer 31 shown in FIGS. 8A and 8B may be in the form of a powder type or a sheet type. In particular, as the heating element 3 in the present invention, in the sheet-type embodiment, the heating element 31 is formed into a sheet by paper-making with a mixture containing the fiber material 3F dispersed therein (hereinafter, this embodiment will be referred to as " (Also referred to as "papermaking type"), the heating device of the present invention has improved heat generation characteristics to the same level as a heating device having a coating type heating layer 31 and improved fitability. Becomes

The heat generating main body 3A shown in FIGS. 8A and 8B includes at least a heat generating layer 31 and a base material sheet 37, and the heat generating layer 31 is provided on one surface of the base material sheet 37. The heat generating main body 3A shown in FIG. 8A is formed of a heat generating layer 31 and a base material sheet 37. If necessary, as shown in FIG. 8B, the heat-generating main body 3A has the same or different material or composition as the base sheet 37 on the surface side of the heat generating layer 31 on which the base sheet 37 is not arranged. The second base material sheet 38 formed in step 1 may be further arranged. Instead of or in addition to this, a water-absorbing sheet or the like containing a water-absorbing material described later may be further arranged.

Although the slit S1 in the present embodiment is formed so as to penetrate the heat generating layer 31 and each of the

base material sheets

37 and 38 in the thickness direction Z, it may be a slit that does not penetrate in the thickness direction Z instead. Good. Specifically, the exothermic body 3A shown in FIG. 8A is formed of the exothermic layer 31 and the base sheet 37 as described above. In the heat-generating main body 3A shown in the figure, a plurality of slits S1 each having a notch formed by the heat-generating layer 31 and the base material sheet 37 penetrating in the thickness direction Z are formed. As shown in the figure, in the plan view of the heat-generating main body 3A, the formation positions of the slits S1 between the heat-generating layer 31 and the base material sheet 37 are the same. That is, the slit S1 is formed at the same position on both the heat generating layer 31 and the base material sheet 37 in the plan view of the heat generating main body 3A. The form of the slits S1 is not limited to this, and some or all of the slits S1 may be formed by notches that penetrate the heating layer 31 in the thickness direction Z and do not penetrate the base material sheet 37 in the thickness direction Z. .. The respective forms of the slit S1 described above may be present in combination.

Further, in the heat-generating main body 3A shown in FIG. 8(b), a plurality of slits S1 are formed which are notches through which the heat-generating layer 31 and each of the

base material sheets

37 and 38 penetrate in the thickness direction Z. As shown in the figure, in the plan view of the heat-generating main body 3A, the formation positions of the slits S1 of the heat generating layer 31 and the respective

base material sheets

37, 38 is formed by a notch that does not penetrate the Z, and the other of the

base material sheets

37, 38 has no notch, (2) some or all of the slits S1 A mode in which one of the

base material sheets

37 and 38 is formed by a notch which penetrates one of the

base material sheets

As the fiber material, natural and synthetic fiber materials can be used without particular limitation. Natural fiber materials include plant fibers (cotton, cabbage, wood pulp, non-wood pulp, peanut protein fiber, corn protein fiber, soy protein fiber, mannan fiber, rubber fiber, hemp, Manila hemp, sisal hemp, New Zealand hemp, Rafu hemp. , Palm, igusa, straw, etc.), animal fiber (wool, goat, mohair, cashmere, alcapa, angora, camel, vicuna, silk, feather, down, feather, algin fiber, chitin fiber, gazein fiber, etc.), mineral fiber (Asbestos and the like). Examples of synthetic fiber materials include semi-synthetic fibers (acetate, triacetate, acetate acetate, promix, chlorinated rubber, chlorinated rubber, etc.), synthetic polymer fibers (nylon, aramid, polyvinyl alcohol, polyvinyl chloride, polyvinylidene chloride, Polyester such as polyethylene terephthalate, polyacrylonitrile, acrylic, polyethylene, polyethylene, polypropylene, polystyrene, polyurethane, rayon, viscose rayon, cupra, etc.), metal fiber, carbon fiber, glass fiber and the like. These fiber materials can be used alone or in combination. Among these, the fiber material uses at least one of wood pulp, cotton, and polyester, from the viewpoint of achieving both uniform dispersibility with the oxidizable metal and oxygen permeability by ensuring voids, and enhancing heat generation characteristics. It is preferable.

When the mixture forming the heat generating layer 31 contains the fiber material 3F, the fiber material has an average fiber length of preferably 0.5 mm or more, more preferably 2 mm or more, and preferably 10 mm or less, more preferably 5 mm or less. is there. When the fiber length of the fiber material is within such a range, the thickness of the heat generating layer 31 can be kept uniform, and the heat generating element 3 having excellent heat generating characteristics can be manufactured.

The content of the fiber material 3F contained in the mixture forming the heat generating layer 31 is preferably 5% by mass or more, more preferably 10% by mass or more, and preferably 50% by mass or less, more preferably 35% by mass or less. is there. When the content of the fiber material is in such a range, the heating element 3 having excellent heat generation characteristics can be manufactured.

9A and 9B and FIGS. 10A and 10B are cross-sectional views showing still another embodiment of the heating element 3. Examples of the embodiment of the heating element 3 including the fiber material used in the present invention include the modes shown in FIGS. 9B and 10B. As shown in the figure, it is preferable that the heat generating layer 31 in the heat generating element 3 further contains the water absorbing material 3P. That is, the heat generating layer 31 is preferably a mixture containing the water-absorbing material 3P in addition to the particles of the oxidizable metal, the electrolyte, the carbon material, and water. By including the water absorbing material 3P in the heat generating layer 31, the water content of the heat generating layer 31 can be appropriately controlled, and as a result, the heat generating characteristics of the heating tool 1 can be successfully controlled.

The heat generating main body 3A shown in FIGS. 9(a) and 9(b) and FIGS. 10(a) and 10(b) includes at least the heat generating layer 31 and the base sheet 37, as in the above-described embodiment. The heat generating layer 31 is provided on one surface of the base material sheet 37. The heat-generating main body 3A shown in FIGS. 9A and 9B is composed of a heat-generating layer 31 and a base sheet 37. If necessary, as shown in FIGS. 10(a) and 10(b), the heat-generating main body 3A is the same as the base material sheet 37 on the surface side of the heat generating layer 31 on which the base material sheet 37 is not arranged. Or a second base material sheet 38 formed of a different material or composition may be further arranged. Instead of or in addition to this, a water absorbing sheet or the like containing the water absorbing material 3P may be further arranged.

base material sheets

37 and 38 in the thickness direction Z, it may be a slit that does not penetrate in the thickness direction Z instead. Good. Specifically, the exothermic body 3A shown in FIGS. 9A and 9B is formed of the exothermic layer 31 and the base sheet 37 as described above. In the heat-generating main body 3A shown in the figure, a plurality of slits S1 each having a notch formed by the heat-generating layer 31 and the base material sheet 37 penetrating in the thickness direction Z are formed. As shown in the figure, in the plan view of the heat-generating main body 3A, the formation positions of the slits S1 between the heat-generating layer 31 and the base material sheet 37 are the same. That is, the slit S1 is formed at the same position on both the heat generating layer 31 and the base material sheet 37 in the plan view of the heat generating main body 3A. The form of the slits S1 is not limited to this, and some or all of the slits S1 may be formed by notches that penetrate the heating layer 31 in the thickness direction Z and do not penetrate the base material sheet 37 in the thickness direction Z. .. The respective forms of the slit S1 described above may be present in combination.

Further, in the heat-generating body 3A shown in FIGS. 10(a) and 10(b), a plurality of slits S1 formed by notches through which the heat-generating layer 31 and each of the

base material sheets

37 and 38 penetrate in the thickness direction Z are formed. Has been done. As shown in the figure, in the plan view of the heat-generating main body 3A, the formation positions of the slits S1 of the heat generating layer 31 and the respective

base material sheets

37, 38 is formed by a notch that does not penetrate the Z, and the other of the

base material sheets

37, 38 has no notch, (2) some or all of the slits S1 A mode in which one of the

base material sheets

37 and 38 is formed by a notch which penetrates one of the

base material sheets

37 and 38 does not penetrate in the thickness direction Z. A form in which a notch is formed or a combination of the forms of the slit S1 described above can be mentioned. In the present embodiment, in the case where the second slit S2 is formed in addition to the first slit S1, the second slit S2, like the slit S1 described above, penetrates, does not penetrate, or these. Can be in the form of a combination.

As the heating element 3, for example, as shown in FIGS. 9A and 10A, the heating layer 31 includes particles of an oxidizable metal, an electrolyte, a carbon material, water and a water absorbing material 3P, and Alternatively, the heating layer 31 may be a mixture containing the water absorbing material 3P as in the embodiment of the present invention shown in FIGS. 9B and 10B. The aspect may further include the above-mentioned fiber material. Specific embodiments of these are, for example, (i) a sheet-shaped heat generating layer 31 in which a water absorbing material and, if necessary, a fiber material are uniformly mixed, or (ii) the water absorbing material is a heat generating layer 31. Of the sheet-like heat-generating layer 31 having a structure in which the water-absorbing material is mainly present in the central region of the thickness direction of the heat-generating layer 31 and the surface of the heat-generating layer 31 is substantially absent, or (iii) the water-absorbing material generates heat. An example is a sheet-shaped heat generating layer 31 that is mainly present on one surface side of the layer 31.

Examples of the water absorbing material 3P include particles of a water absorbing polymer. Specific examples of the water-absorbing polymer include starch, crosslinked carboxymethyl cellulose, polymers or copolymers of acrylic acid or alkali metal acrylate, polyacrylic acid and its salts, and polyacrylate graft polymer. Can be mentioned. The shape of the water-absorbing material may be spherical, lump-shaped, grape-bundle-shaped, fibrous, or other particles. The particle size of the water absorbing material is preferably 1 μm or more, more preferably 10 μm or more, preferably 1000 μm or less, more preferably 500 μm or less. Examples of particles of such a water-absorbent polymer include partial sodium salts of acrylic acid polymers such as Aqualic CA and Aqualic CAW (both manufactured by Nippon Shokubai Co., Ltd.).

The basis weight of the water-absorbent material 3P is preferably 20 g/m ² or more, more preferably 40 g/m ² or more, preferably 100 g/m ² or less, and more preferably 80 g/m from the viewpoint of improving heat generation durability. ² or less, more preferably 70 g/m ² or less. This basis weight is a value when the heat generating layer 31 is formed on one surface of the base material sheet 37.

11A and 11B and FIGS. 12A and 12B are sectional views showing still another embodiment of the heating element 3. As shown in the figure, it is also preferable that the heat-generating main body 3A is further provided with a water-absorbing material layer 3L containing a water-absorbing material 3P on the side opposite to the base material sheet 37 with the heat-generating layer 31 interposed therebetween. The water absorbing material layer 3L shown in the figure is arranged so as to be in contact with the heat generating layer 31. Even with such a configuration, the water content of the heating layer 31 can be appropriately controlled, and as a result, the heating characteristics of the heating tool 1 can be successfully controlled. Examples of the form of the water absorbing material layer 3L include (i) spraying the water absorbing material 3P on the heat generating layer 31 or (ii) including the water absorbing material 3P on the surface side of the heat generating layer 31 on which the base sheet 37 is not arranged. A water absorbing sheet is placed on top of another, or (iii) a water absorbing material 3P is sprinkled or the water absorbing sheet is placed on the surface side of the heat generating layer 31 on which the base material sheet 37 is not placed, and the heat generating layer of the water absorbing material 3P is further arranged. The second base material sheet 38 may be superposed on the surface on the side where 31 is not arranged. That is, the water-absorbent material layer 3L can be formed by spraying the water-absorbent material 3P or arranging a sheet-shaped material containing the water-absorbent material 3P. The material, shape and basis weight of the water absorbent material 3P can be the same as described above.

The heat generating main body 3A shown in FIGS. 11(a) and (b) and FIGS. 12(a) and 12(b) includes at least the heat generating layer 31 and the base sheet 37, as in the above-described embodiment. The heat generating layer 31 is provided on one surface of the base material sheet 37. Examples of the embodiment of the heating element 3 including the fiber material used in the present invention include the modes shown in FIGS. 11B and 12B. The heat generating main body 3A shown in FIGS. 11A and 11B is formed by disposing a water absorbing material layer 3L containing a water absorbing material 3P in addition to the heat generating layer 31 and the base material sheet 37. If necessary, as shown in FIGS. 12(a) and 12(b), the heat-generating main body 3A is the same as the base sheet 37 on the surface side of the water-absorbing material layer 3L on which the heat-generating layer 31 is not arranged. Or a second base material sheet 38 formed of a different material or composition may be further arranged.

base material sheets

37 and 38 in the thickness direction Z, it may be a slit that does not penetrate in the thickness direction Z instead. Good. In detail, the heat-generating main body 3A shown in FIGS. 11A and 11B is formed to include the water absorbing material layer 3L in addition to the heat generating layer 31 and the base material sheet 37. The exothermic body 3A shown in the figure is provided with a plurality of slits S1 each formed by a notch through which the exothermic layer 31, the base sheet 37, and the water absorbing material layer 3L penetrate in the thickness direction Z. As shown in the figure, in the plan view of the heat-generating main body 3A, the heat-generating layer 31 and the base sheet 37 are formed at the same position of the slit S1. The form of the slit S1 is not limited to this, and a part or all of the slit S1 is formed by a notch that penetrates the heat generating layer 31 and the water absorbing material layer 3L in the thickness direction Z and does not penetrate the base material sheet 37 in the thickness direction Z. It may have been done. The respective forms of the slit S1 described above may be present in combination.

The heat generating main body 3A shown in FIGS. 12(a) and 12(b) has a slit formed by a notch in which all of the heat generating layer 31, each of the

base material sheets

37 and 38, and the water absorbing material layer 3L penetrate in the thickness direction Z. A plurality of S1s are formed. As shown in the figure, in the plan view of the heat-generating main body 3A, the heat-generating layer 31, each of the

base material sheets

37, 38, and the slit S1 of the water-absorbing material layer 3L are formed at the same position and at the same position. .. The form of the slit S1 is not limited to this. For example, (1) some or all of the slits S1 penetrate one of the two

base material sheets

37, 38 in the thickness direction Z, and the heating layer 31 in the thickness direction. The

base sheet

37, 38 is formed of a notch that does not penetrate the Z, and the other of the both

base sheet

37, 38 has no notch. One of the

base material sheets

37 and 38 is formed with a notch that penetrates one of the

base material sheets

37 and 38 in the thickness direction Z and penetrates the heat generating layer 31 and the water absorbing material layer 3L in the thickness direction Z. No form, (3) some or all of the slits S1 penetrate the heat generating layer 31 and the water absorbing material layer 3L in the thickness direction Z by one of the both

base material sheets

37, 38, and both

base material sheets

37, 38 The other of 38 includes a form in which a notch that does not penetrate in the thickness direction Z is formed, or a combination of the forms of the slit S1 described above. In the present embodiment, in the case where the second slit S2 is formed in addition to the first slit S1, the second slit S2, like the slit S1 described above, penetrates, does not penetrate, or these. Can be in the form of a combination.

The above was a description of the heating tool 1, but the manufacturing method of the heating tool 1 will be described below. As a method for manufacturing the heating tool 1, (i) a coating material containing particles of an oxidizable metal, a carbon component, and water is applied to one surface of a base material sheet 37 to form a heat generating layer 31, and then heat is generated. A method of forming slits in the layer 31 and the base material sheet 37 (hereinafter, this manufacturing method is also referred to as "coating type manufacturing method"), or (ii) particles of an oxidizable metal, carbon component, water and fiber material The composition containing is paper-made to form an intermediate molded body, the intermediate molded body is made to contain an electrolyte to form a heat generating layer 31, and then the heat generating layer 31 and the base material sheet 37 are laminated to form a slit. (Hereinafter, this manufacturing method is also referred to as a “papermaking mold manufacturing method”). Whichever manufacturing method is used, it is possible to manufacture a warming tool having high fitting properties and excellent heat generation characteristics.

The coating type manufacturing method in the heating tool 1 includes a step A of coating an electrolyte on one surface of the base material sheet 37 in a solid state or an aqueous solution state, and particles of an oxidizable metal not containing the electrolyte. A heating layer forming step including a step B of applying a coating material containing a carbon material and water. The step of applying the electrolyte can be carried out by a means such as spraying the electrolyte in a solid state or spraying an aqueous solution. The step of applying the coating material containing particles of the oxidizable metal, the carbon material and water can be performed by applying the coating material using a coating device such as a die coater. Either step A or step B may be performed first, or step A and step B may be performed simultaneously. In this way, the heat generating layer 31 containing the particles of the oxidizable metal, the electrolyte, the carbon material, and water is formed on one surface of the base material sheet 37. When the heat generating layer 31 contains a fibrous material, the base material sheet 37 is coated with a coating material mixed with the fibrous material, or the fibrous material is sprinkled on the heat generating layer 31, so that the particles of the oxidizable metal and the electrolyte are A heat generating layer 31 containing carbon material, fiber material and water is formed. After forming the heat generating layer 31, a second base material sheet 38 may be further laminated on the opposite side of the base material sheet 37 with the heat generating layer 31 interposed therebetween, if necessary.

When the heating element 3 including the water-absorbing material 3P is formed, after the heating layer 31 is formed through the heating layer forming step, before the formation thereof, or between the steps A and B in the heating layer forming step. Alternatively, a water-absorbing material supplying step of supplying the water-absorbing material 3P to the surface of the base material sheet 37 on which the heat-generating layer 31 is formed (or the surface where the heat-generating layer is to be formed) may be provided simultaneously with the formation of the heat-generating layer 31. The water-absorbing material 3P is supplied by mixing the water-absorbing material 3P with the coating material, applying the water-absorbing material 3P on the coating material, or laminating a water-absorbing sheet containing the water-absorbing material 3P on the coating material. It can be carried out. After forming the heat generating layer 31, a second base material sheet 38 may be further laminated on the opposite side of the base material sheet 37 with the heat generating layer 31 interposed therebetween, if necessary.

Next, a slit consisting of a linear or arcuate cut is formed in the heat generating layer 31 and the base material sheet 37 (slit forming step). When forming a slit formed of a linear cut, for example, one or more first slit rows L1 arranged so that a group of one or a plurality of first slits S1 extends in one direction is formed in one row or in a plurality of rows. In addition, if necessary, a second slit in which a group of one or a plurality of second slits S2 extending in a direction intersecting the extending direction of the first slit row L1 is arranged so as to extend in one direction. The row L2 may be formed in one row or a plurality of rows to form the heat generating main body 3A. Each of the slits S1 and S2 of the first slit row L1 and the second slit row L2 is formed by using a cutting blade and causing the cutting blade to enter the heat generating main body 3A including the heat generating layer 31 and the base sheet 37. .. Each slit S1, S2 can be a slit that penetrates or does not penetrate in the thickness direction Z by appropriately adjusting the degree of penetration of the cutting blade.

When forming a slit row in the heat generating layer 31 and the base material sheet 37, for example, while the base material sheet 37 having the heat generating layer 31 formed thereon is conveyed in one direction, the first row is formed so as to extend in the same direction as the conveying direction. One or a plurality of slit rows L1 are formed. Then, if necessary, it is preferable to form one or a plurality of second slit rows L2 so as to extend in a direction intersecting the transport direction. By forming each slit row in this order, the base material sheet can be stably conveyed, and it is advantageous in that the deviation of the formation positions of the slits S1 and S2 can be suppressed as much as possible.

For forming the first slit row L1, for example, a first cutter roll having intermittently extending cutting edges along the circumferential direction of the roll and having cutting blades arranged in one or more rows in the axial direction of the roll can be used. .. In addition, for forming the second slit row L2, a second cutter roll that intermittently extends along the axial direction of the roll and that has cutting blades arranged in one or more rows in the circumferential direction of the roll may be used. .. When forming the slits as shown in FIG. 5, only the first slit row L1 is formed by using the first cutter roll without using the second cutter roll for forming the second slit row L2. do it.

When both the slit rows L1 and L2 are formed in a direction that intersects the transport direction, for example, while the substrate sheet 37 on which the heat generating layer 31 is formed is transported in one direction, the cutting blade is set in the extending direction. It may be formed by using a cutter roll arranged so as to intersect the axial direction of the roll. In addition, when forming the first slit formed of a notch on an arc as shown in FIGS. 6D to 6F, for example, the base sheet 37 on which the heat generating layer 31 is formed is arranged in one direction. It may be formed by using a cutter roll having an arcuate cutting blade arranged on a peripheral surface of the roll at a predetermined position while being conveyed.

In particular, in the coating-type manufacturing method, in order to form each of the slits S1 and S2 in the heat generating layer 31, it is preferable to reduce the fluidity of the coating so that it is difficult to restore the state before the cutting blade enters. .. The fluidity of the paint can be lowered by, for example, adding a thickener to the paint or reducing the water content of the paint. In addition to the above-mentioned measures, it is preferable to increase the coating amount of the coating material or increase the content of the water-absorbing material, in addition to reducing the fluidity of the coating material and successfully exhibiting the heat generation characteristics.

The content of the thickener contained in the coating material for forming the heat generating layer 31 is 100% from the viewpoint that the fitting property of the heating tool is improved, the heat generation characteristic is improved, and the processability is combined at a high level. It is preferably 0.05 parts by mass or more, more preferably 0.1 parts by mass or more, and preferably 10 parts by mass or less, more preferably 5 parts by mass or less, based on parts by mass. In addition, the content of water is preferably 15% by mass or more, and more preferably 25% by mass or more based on the total mass of the coating material from the viewpoint of simultaneously improving the exothermic characteristics of the heating device and the processability. Further, it is preferably 60% by mass or less, more preferably 45% by mass or less. From the viewpoint of improving the processability of the heat generating layer, the fluidity of the coating material is preferably 2000 mPa·s or more, more preferably 5000 mPa·s or more, and preferably 30,000 mPa·s or less, more preferably 15000 mPas as the viscosity of the coating material.・S or less. The viscosity was measured at 23° C. and 50% RH by using a No. 4 rotor of B-type viscometer and rotating the rotor at 6 rpm.

The coating amount of the paint is preferably 180 g/m ² or more, more preferably 350 g/m ² or more, and preferably 1200 g/m ² or less, more preferably 1000 g/m ² or less, and further as a basis weight. It is preferably 800 g/m ² or less. Even when the fibrous material and the water absorbing material are mixed with the coating material, the coating amount may be within the above range. With such a coating amount, it is possible to easily form the slits in the heat generating layer 31 and the base material sheet 37, and as a result, it is possible to obtain the warming tool 1 having high fitting properties and heat generating characteristics. If the content of the water absorbing material is the above-mentioned basis weight, the effect of the present invention is sufficiently exhibited.

Finally, the heat-generating main body 3A in which the slits are formed is housed in a bag body composed of the skin side sheet 32 and the non-skin side sheet 33 to form the heat generating body 3. After that, the heat generating body 3 is placed on the skin side. The sheet 32 and the first sheet 5 are held between the first sheet 5 and the second sheet 6 such that the non-skin side sheet 33 and the second sheet 6 face each other. In this way, the desired heating tool 1 can be manufactured.

Next, a method of manufacturing the papermaking mold for the heating tool 1 will be described. In the present manufacturing method, a composition containing particles of an oxidizable metal, a carbon material, a fiber material, and water is made into a paper to form an intermediate compact, and an electrolyte is contained in the intermediate compact to form a heat generating layer 31. After that, the heat generating layer 31 and the base material sheet 37 are laminated.

First, a composition containing particles of an oxidizable metal, a carbon material, a fiber material and water is manufactured. The content of the oxidizable metal particles in the composition excluding water is preferably 10% by mass or more, more preferably 30% by mass or more, from the viewpoint of enhancing flexibility and heat generation characteristics of the heat generating layer 31. , Preferably 90 mass% or less, more preferably 80 mass% or less.

From the same viewpoint, the content of the carbon material in the composition excluding water is preferably 1.5% by mass or more, more preferably 3% by mass or more, and preferably 15% by mass or less, more preferably It is 10 mass% or less. From the viewpoint of achieving both moldability and heat generation characteristics of the heat generation layer 31, the content of the fiber material in the composition excluding water is preferably 2% by mass or more, more preferably 5% by mass or more, and , Preferably 80 mass% or less, more preferably 50 mass% or less.

When the water absorbing material 3P is dispersed in the heat generating layer 31, the water absorbing material 3P can be contained in the composition. The content of the water-absorbing material 3P in the composition excluding water is preferably 1% by mass or more, more preferably 3% by mass or more, and preferably 15% by mass or less, more preferably 10% by mass or less. ..

The composition may be further added with additives usually used in the papermaking of paper, such as colorants, paper strength enhancers, retention aids, fillers, thickeners, pH adjusters, bulking agents and the like. Good. The blending amount of the additive in the raw material composition can be appropriately set according to the additive to be added.

Next, the composition is paper-made to form an intermediate molded body having a predetermined shape. For the papermaking of the intermediate molded body, a conventional method used for papermaking of a molded body of various forms such as a sheet shape and a three-dimensional shape can be used without particular limitation. As such a papermaking method, for example, in the case where the intermediate molded body is formed into a sheet, a cylinder paper machine, a fourdrinier paper machine, a fourdrinier paper machine, a twin wire paper machine, or the like, which is a continuous paper machine, is used. Examples of the method include a papermaking method and a handmade method that is a batch-type papermaking method. When the intermediate molded body has a three-dimensional shape, for example, it is described in Japanese Patent No. 3155522, Japanese Patent No. 3155503, and Japanese Patent No. 3072088. The method can be appropriately adopted. From the viewpoint of forming the thin heating element 3, it is preferable to make a sheet-shaped intermediate molded body. In this step, the fibrous material can be further kneaded with the surface of the molded product, if necessary.

The sheet-shaped intermediate molded body obtained by papermaking has a water content of preferably 70% by mass or less, more preferably 60% by mass or less, and its lower limit is preferably from the viewpoint of maintaining moldability and mechanical strength. You may have the dehydration process of dehydrating until it becomes 5 mass% or more, More preferably, it becomes 10 mass% or more. Examples of the dehydration method include dehydration by suction, a method of dehydrating by blowing heated air, a method of applying pressure with a pressure roll or a pressure plate for dehydration. These dehydrations may be performed in an air atmosphere, or preferably in an inert gas atmosphere from the viewpoint of suppressing the oxidation of the oxidizable metal. In this way, a sheet-shaped and dry intermediate molded body containing the particles of the oxidizable metal, the carbon material and the fiber material, and further containing the water absorbing material as necessary is formed.

Next, the intermediate molded body is made to contain an electrolyte to form the heat generating layer 31. The step of containing the electrolyte is preferably performed in an atmosphere of an inert gas such as nitrogen or argon. In this step, an appropriate method can be adopted depending on the method of treating the intermediate molded body after papermaking, the water content, the form and the like. As a method for containing the electrolyte, for example, an aqueous solution of the electrolyte can be impregnated into the intermediate molded body by a method such as spraying, dipping, or gravure coating, or a solid electrolyte can be dispersed in the intermediate molded body. The sheet-shaped heat generating layer 31 formed in this manner can be laminated, for example, and disposed on one surface of the base material sheet 37. If necessary, the second base material sheet 38 can be laminated on the surface of the heat generating layer 31 on the side where the base material sheet 37 is not arranged.

Next, a slit formed by a linear or arcuate cut is formed in the heat generating layer 31 and the base material sheet 37. When forming a slit formed of a linear cut, for example, one or more first slit rows L1 arranged so that a group of one or a plurality of first slits S1 extends in one direction is formed in one row or in a plurality of rows. At the same time, if necessary, a second slit row L2 in which a group of one or a plurality of second slits S2 extending in a direction intersecting with the extending direction of the first slit row L1 is arranged so as to extend in one direction. Are formed in one row or a plurality of rows to form the heat generating main body 3A. The method of forming the slit row can be performed in the same manner as the above-described coating type manufacturing method.

When the composition does not contain a water-absorbing material and the heating element 3 contains a water-absorbing material, before or after forming the slit row, on the surface side of the heating layer 31 where the base sheet 37 is not arranged. The heat absorbing body 3A having the water absorbing material layer 3L containing the water absorbing material 3P can be formed by spraying the water absorbing material 3P or disposing the water absorbing sheet containing the water absorbing material 3P. After that, the second base material sheet 38 may be superposed on the surface side of the water absorbing material layer 3L where the heat generating layer 31 is not arranged, if necessary. The basis weight of the water absorbent material 3P in this step can be the same as the basis weight described above.

Although the present invention has been described above based on its preferred embodiments, the present invention is not limited to the above embodiments.
For example, the form of the ear hook 4 in the heating tool 1 is not limited to the sheet-like member shown in FIGS. 1 and 2 as long as the main body 2 can be fixed to both eyes of the user. For example, as shown in FIG. 13, a string-shaped ear hooking portion 4 may be adopted, or a thread-shaped or band-shaped ear hooking portion 4 may be adopted. From the viewpoint of enhancing the fit of the warming tool, it is preferable to use the elastic body such as rubber to make the ear hook 4 which is expandable and contractible.

Although the form of the heating element 3 in the above-described heating tool 1 is described as a configuration in which the two heating elements 3 are held separately, if the two eyes of the user and their surroundings can be given a warm feeling, the heating element 3 is heated. The form of the ingredient is not particularly limited. For example, one heating element having a shape and a size capable of covering both eyes of the user and its surroundings may be held between the first sheet 5 and the second sheet 6, and three or more heat generating elements may be generated. The body may be held between the first sheet 5 and the second sheet 6.

In the warming tool 1 described above, the heat-generating main body 3A has been described as a form in which the base material sheet 37 and the second base material sheet 38 are arranged as necessary, but instead of this, a papermaking type heat generation. When forming the layer 31, the

base material sheets

37 and 38 may not be arranged. That is, only the sheet-shaped heat generating layer 31 having the above-described slits is housed in the flat packaging material having the skin side sheet 32 on one side and the non-skin side sheet 33 on the other side, and the heating element 3 May be. Even in this case, the heat generating layer 31 can obtain good effects such as water retention, moldability and shape retention. In addition, since the paper-making type sheet-shaped heat generating layer 31 is formed with the slits of the above-described aspects, it is possible to improve heat generation characteristics to a level equivalent to that of the heating tool including the coating type heating element 3 and to generate the heat. The warming tool including the body 3 has improved fit to the wearer.

When at least the heat generating layer 31 has a plurality of first slit rows L1 and a plurality of second slit rows L2, the interval W3 between the first slit rows L1 is shown in FIG. As described above, it is preferable that the gap W6 is larger than the gap W6 between the second slit rows L2 or smaller than the gap W6 as shown in FIG. 14B, and the gap W3 is the gap W6. It is more preferable that the size is smaller than the above. With such a configuration, in addition to the improvement in heat generation characteristics, the fitting property of the heating tool is further improved. This is particularly advantageous when the above-mentioned slits S1 and S2 are formed in the paper-making type heat generating layer 31.

Further, at least in the heat generating layer 31, when a plurality of first slit rows L1 in which a group of a plurality of first slits S1 formed of linear cuts are arranged to extend in one direction is formed, When the two arbitrary slit rows L1 and L1 that meet are viewed along the direction in which the slit rows extend, at any position, there may be a slit S1 that constitutes at least one slit row L1. preferable. In the embodiment shown in FIG. 15, the pitches of the first slit rows L1 formed in the adjacent first slit rows L1 are the same and the phases are shifted by a half pitch, and each slit S1 is staggered. It has a childlike form. The pitches of adjacent slit rows L1 may be the same or different. Further, the phase shift between the adjacent slit rows L1 may be periodic or aperiodic.

The slit formation mode shown in FIG. 15 has been described by taking as an example the mode in which only the first slit S1 and the first slit row L1 are formed, but the present invention is not limited to this mode, and the second slit S2 and the second slit S2 The slit row L2 may be further formed. In this case, a plurality of second slit rows L2 are formed, and when any two adjacent slit rows L2, L2 are viewed along the direction in which the slit rows extend, at any position, It is also preferable that at least one slit S2 forming the slit row L2 is present. In this embodiment, the pitches of adjacent slit rows L2 may be the same or different. Further, the phase shift between the adjacent slit rows L2 may be periodic or aperiodic.

Regarding the above-described embodiment of the present invention, the following heating device is further disclosed.
<1>
A heat generating layer is provided on one surface of the base sheet,
The exothermic layer contains a mixture of oxidizable metal particles, an electrolyte, a carbon material and water,
A heating tool in which one or more first slits each having a linear or arcuate cut are formed in the heat generating layer and the base sheet.

<2>
The heating device according to <1>, wherein the plurality of first slits formed by linear cuts are formed on the heat generating layer and the base sheet so as to be arranged in parallel in the same direction.
<3>
The heating tool according to <2>, wherein one second slit made of a notch is formed so as to extend in a direction intersecting with a direction in which the first slit extends.
<4>
The heating device according to <2>, wherein a plurality of second slits formed by notches are arranged in parallel in the same direction and extend in a direction intersecting with the extending direction of the first slits.

<5>
The heating device according to <4>, wherein the first slit and the second slit are arranged so that the first slit and the second slit do not intersect with each other.
<6>
One or a plurality of first slit rows in which a group of a plurality of first slits formed of linear cuts are arranged to extend in one direction is formed,
When a plurality of first slit rows are formed, the heating device according to <1>, wherein the first slit rows are formed so as not to intersect with each other.
<7>
The interval between the first slits in the first slit row is preferably 0.5 mm or more, more preferably 1 mm or more, and preferably 20 mm or less, more preferably 10 mm or less. The described heating equipment.
<8>
The number of rows of the first slit row is preferably 1 row or more, more preferably 2 rows or more, further preferably 3 rows or more, and preferably 10 rows or less, more preferably 5 rows or less, The heating tool according to any one of <2>, <6>, and <7>.
<9>
A plurality of first slits formed of linear cuts are formed,
Any one of the above <6> to <8>, wherein one row of first slit rows in which a group of first slits are arranged to extend in one direction is formed in the heat generating layer and the base material sheet. The heating tool described in 1.

<10>
A plurality of first slit rows are formed,
The distance between the first slit rows is preferably 4 mm or more, more preferably 8 mm or more, and preferably 25 mm or less, more preferably 15 mm or less, according to the above <2>, <6> to <8>. Heater according to any one of the above.
<11>
A group of a plurality of second slits consisting of notches is formed in one row or a plurality of rows so that a second slit row arranged so as to extend in one direction extends in a direction intersecting with the first slit row,
When a plurality of second slit rows are formed, the second slit rows are formed so as not to intersect with each other and extend in a direction intersecting with the first slit row, in <6> above. The described heating equipment.
<12>
The heating tool according to <11>, in which the first slit and the second slit are arranged so that the first slit and the second slit do not intersect with each other.
<13>
The first slit and the second slit are arranged so that the first slit in the first slit row passes between two second slits adjacent to each other in the front and rear direction in the second slit row. , The heating device according to <12>.
<14>
The first slits and the second slits are arranged so that the second slits in the second slit row do not pass between the two first slits adjacent to each other in the front and rear direction in the first slit row. , The heating device according to <13>.

<15>
The length of the first slit is formed shorter than the length of the second slit,
The first slit and the second slit are arranged so that the first slit S1 passes between the second slits S2 that are adjacent to each other in the second slit row direction. The above <13> or <13>14> The heating device described in 14>.
<16>
The length of the first slit S1 and the length of the second slit S2 are the same,
The first slit and the second slit are arranged such that the pitches of the first slit rows formed in the adjacent first slit rows are the same and the phases are shifted by a half pitch. > Or <14>.
<17>
The length of the first slit is formed longer than the length of the second slit,
In the <14>, the first slit and the second slit are arranged so that the first slit passes between the second slits S2 adjacent to each other in the extending direction of the second slit row. The described heating equipment.
<18>
The heating tool according to any one of <11> to <17>, wherein the first slit row and the second slit row are orthogonal to each other.
<19>
The heating device includes a main body having a lateral direction and a vertical direction orthogonal to the lateral direction, and having a shape elongated in the lateral direction,
The main body includes the heat generating layer,
The first slit row and the second slit row are formed so as to intersect with both the horizontal direction and the vertical direction and be inclined so as not to be orthogonal to both the horizontal direction and the vertical direction, The heating device according to any one of <7> to <14>.

<20>
The heating device includes a main body having a lateral direction and a vertical direction orthogonal to the lateral direction, and having a shape elongated in the lateral direction,
The main body includes the heat generating layer,
The heating device according to any one of <11> to <18>, wherein the first slit row extends in the vertical direction and the second slit row extends in the horizontal direction.
<21>
A plurality of second slits that are notches are formed,
The interval between the second slits in the second slit row is preferably 0.5 mm or more, more preferably 1 mm or more, and preferably 10 mm or less, more preferably 5 mm or less, <11> or The heating tool according to any one of <20>.
<22>
The number of rows of the second slit row is preferably 1 row or more, more preferably 2 rows or more, further preferably 4 rows or more, and preferably 7 rows or less, more preferably 5 rows or less, The heating tool according to any one of <11> to <21>.
<23>
A plurality of second slits that are notches are formed,
Any one of the above <11> to <22>, wherein one row of second slit rows in which a group of second slits are arranged to extend in one direction is formed in the heat generating layer and the base material sheet. The heating tool described in 1.
<24>
A plurality of second slit rows are formed,
The interval between the second slit rows is preferably 4 mm or more, more preferably 8 mm or more, and preferably 20 mm or less, more preferably 15 mm or less, any one of the above <11> to <22> Heater described in.

<25>
The length of the second slit is preferably 2 mm or more, more preferably 4 mm or more, and preferably 40 mm or less, more preferably 30 mm or less, <3> to <5>, <11> to The heating tool according to any one of <24>.
<26>
The heating tool according to <1>, wherein the plurality of first slits each having an arcuate cut are formed on the heat generating layer and the base sheet so as to be located on the same circumference.
<27>
The heating device according to <1>, wherein the plurality of first slits formed by arcuate cuts are formed on the heat generating layer and the base sheet so as to be located on two or more concentric circles.
<28>
The length of the first slit is preferably 1 mm or more, more preferably 4 mm or more, and preferably 50 mm or less, more preferably 40 mm or less, according to any one of the above <1> to <27>. The described heating equipment.
<29>
The heating device according to any one of <1> to <28>, in which the heat generating layer includes a fiber material.

<30>
The heating tool according to <29>, wherein the fiber material is preferably at least one selected from wood pulp, cotton, and polyester.
<31>
The above-mentioned <29> or <30>, wherein the fiber material has an average fiber length of preferably 0.5 mm or more, more preferably 2 mm or more, and preferably 10 mm or less, more preferably 5 mm or less. Ingredient
<32>
The content of the fibrous material is preferably 5% by mass or more, more preferably 10% by mass or more, and preferably 50% by mass or less, more preferably 35% by mass or less, <29> to <31> The heating device according to any one of 1.
<33>
The heating tool according to any one of <1> to <32>, wherein the heat generating layer further includes a water absorbing material.
<34>
At least one of the first slit and the second slit is a thermal heat according to any one of <1> to <33>, wherein the heating layer and the base material sheet are both cut through in the thickness direction. Ingredient

<35>
Any one of <1> to <33>, wherein at least one of the first slit and the second slit is a notch that penetrates the heating layer in the thickness direction and does not penetrate the base sheet in the thickness direction. The heating device described in Kaichi.
<36>
One of the <1> to <33>, wherein at least one of the first slit and the second slit is formed at the same position on both the heat generating layer and the base sheet in a plan view. Heater described in.
<37>
The heating device according to any one of <1> to <33>, in which a second base material sheet is arranged on a surface side of the heat generating layer on which the base material sheet is not arranged.
<38>
The heating device according to <37>, wherein at least one of the first slit and the second slit is a notch that penetrates all of the heat generating layer, the base sheet and the second base sheet in the thickness direction. ..
<39>
At least one of the first slit and the second slit is a cut that penetrates either one of the base sheet and the second base sheet in the thickness direction and does not penetrate the heating layer in the thickness direction. ,
The heating device according to <37>, in which the other of the base sheet and the second base sheet has no cut formed therein.

<40>
At least one of the first slit and the second slit is a notch that penetrates one of the base sheet and the second base sheet in the thickness direction and penetrates the heat generating layer in the thickness direction. ,
The heating device according to <37>, in which the other of the base sheet and the second base sheet has no cut formed therein.
<41>
At least one of the first slit and the second slit penetrates one of the base sheet and the second base sheet and the heating layer in the thickness direction, and the base sheet and the second slit. The heating tool according to <37>, wherein the other of the two base material sheets is a notch that does not penetrate in the thickness direction.
<42>
In a plan view, at least one of the first slit and the second slit is formed at the same position in the heat generating layer and at least one of the base material sheet and the second base material sheet, The heating device according to any one of 37> to <41>.
<43>
The heating tool according to any one of <1> to <42>, further including a water absorbing material layer containing a water absorbing material on the side opposite to the base sheet with the heat generating layer interposed therebetween.
<44>
The heating device according to <43>, wherein the water absorbing material layer is formed by spraying the water absorbing material on the heat generating layer.

<45>
The heating device according to <43>, wherein the water absorbing material layer is formed by disposing a water absorbing sheet containing the water absorbing material on a surface side of the heat generating layer where the base material sheet is not arranged.
<46>
Any one of the above-mentioned <43> to <45>, wherein at least one of the first slit and the second slit is a notch formed by the heat-generating layer, the base sheet and the water-absorbing material layer all passing through in the thickness direction. The heating tool described in 1.
<47>
At least one of the first slit and the second slit is a notch that penetrates the heat generating layer and the water absorbing material layer in the thickness direction and does not penetrate the base material sheet in the thickness direction. The heating tool according to any one of <45>.
<48>
In a plan view, at least one of the first slit and the second slit is formed at the same position of the heat generating layer, the base material sheet and the water absorbing material layer, respectively, <43> to <47> The heating device according to any one of 1.
<49>
The heating device according to any one of <43> to <48>, in which a second base material sheet is arranged on a surface of the water absorbing material layer on which the heat generating layer is not arranged.

<50>
<49>, wherein at least one of the first slit and the second slit is a cut through which all of the heat generating layer, the base sheet, the second base sheet and the water absorbing material layer penetrate in the thickness direction. Heater described in.
<51>
At least one of the first slit and the second slit is formed by a notch that penetrates one of the base material sheet and the second base material sheet in the thickness direction and does not penetrate the heating layer in the thickness direction. And
The heating device according to <49>, in which the other of the base sheet and the second base sheet has no cut formed therein.
<52>
At least one of the first slit and the second slit penetrates one of the base material sheet and the second base material sheet in the thickness direction and penetrates the heat generating layer and the water absorbing material layer in the thickness direction. It is formed from the notch
The heating device according to <49>, in which the other of the base sheet and the second base sheet has no cut formed therein.
<53>
At least one of the first slit and the second slit penetrates one of the base material sheet and the second base material sheet, the heat generation layer, and the water absorbing material layer in the thickness direction, and The heating device according to <49>, in which the other of the base sheet and the second base sheet is formed with a notch that does not penetrate in the thickness direction.
<54>
In a plan view, at least one of the first slit and the second slit is located at the same position in the heat generating layer, at least one of the base material sheet and the second base material sheet, and the water absorbing material layer. The heating device according to any one of <49> to <53>, which is formed.

<55>
The second base material sheet has a basis weight of preferably 10 g/m ² or more, more preferably 35 g/m ² or more, preferably 200 g/m ² or less, more preferably 150 g/m ² or less, <37> to <42>, The heating device according to any one of <49> to <54>.
<56>
The water-absorbing material is particles of a water-absorbing polymer,
The water-absorbent polymer is at least one selected from starch, crosslinked carboxymethyl cellulose, polymers or copolymers of acrylic acid or alkali metal acrylate, and polyacrylic acid and its salts, and polyacrylate graft polymer. The heating device according to any one of <33> to <55>.
<57>
The heating device according to any one of <33> to <56>, wherein the water absorbing material has at least one of a spherical shape, a lump shape, a grape tuft shape, and a fibrous shape.
<58>
The water absorbing material has a particle size of preferably 1 μm or more, more preferably 10 μm or more, preferably 1000 μm or less, more preferably 500 μm or less, according to any one of <33> to <57>. Heating equipment.
<59>
The water absorbing material has a basis weight of preferably 20 g/m ² or more, more preferably 40 g/m ² or more, preferably 100 g/m ² or less, more preferably 80 g/m ² or less, and further preferably 70 g. /M ² or less, the heating device according to any one of <33> to <58>.

<60>
The heating device has a main body having a shape that covers both eyes of the user when in use, a heating element provided in the main body, and a covering of both eyes of the user by the main body attached to the main body. With a pair of ear hooks that can maintain the state,
The heating element includes the base sheet and the heating layer,
The main body portion includes a first sheet located on the side closer to the user's skin, and a second sheet located on the side farther from the user's skin,
The heating device according to any one of <1> to <59>, in which a first sheet and a second sheet are joined so that the heating element is held between the first and second sheets.
<61>
The heating element according to <60>, wherein the heating element is formed by accommodating a heat-generating main body including the heat-generating layer and the base sheet in a bag body.
<62>
The heating tool has a horizontal direction and a vertical direction orthogonal to the horizontal direction, and includes the main body portion having a shape elongated in the horizontal direction,
The said ear hook part is a heating tool as described in said <60> or <61> which has a joining area joined to the said main-body part in both outer end areas of the said horizontal direction.
<63>
The heating device according to any one of <60> to <62>, in which the ear hooking portion is made of a sheet material, and an insertion portion for inserting an ear is formed in the sheet material.
<64>
The heating tool according to any one of <60> to <62>, in which the ear hooking portion is formed of a string-shaped member.

<65>
The heating tool according to <64>, wherein the ear hooking portion is made of an elastic body.
<66>
The warmth according to any one of <60> to <65>, wherein the air permeability of JIS P8117 of the first sheet is preferably lower than the air permeability of the second sheet.
<67>
The air permeability defined by JIS P8117 of the first sheet is preferably 0.01 seconds/100 mL or more, more preferably 50 seconds/100 mL or more, and further preferably 2000 seconds/100 mL or more. The heating device according to any one of <60> to <66>, which is preferably 15000 seconds/100 mL or less, more preferably 10000 seconds/100 mL or less.
<68>
The air permeability of the second sheet is preferably as high as possible, specifically, 50 seconds/100 mL or more is preferable, 4000 seconds/100 mL or more is more preferable, and 20000 seconds/100 mL or more is further preferable. The heating device according to any one of <60> to <67>, which is more preferably a non-ventilated sheet.
<69>
The water vapor transmission rate of JIS Z0208 of the first sheet is preferably 2000 g/(m ² ·24 h) or more, more preferably 2500 g/(m ² ·24 h) or more, and more preferably 3000 g/(m ^{2 ).} The heating device according to any one of <60> to <68>, further preferably 24 h) or more.

<70>
The water heater according to any one of <60> to <69>, wherein the water vapor permeability of the second sheet defined by JIS Z0208 is the same as or different from the water vapor permeability of the first sheet.
<71>
Both the first sheet and the second sheet are non-woven fabrics,
The heating device according to any one of <60> to <70>, in which the basis weight of the second sheet is preferably larger than the basis weight of the first sheet.
<72>
The basis weight of the first sheet is preferably 10 g/m ² or more, more preferably 20 g/m ² or more, and preferably 200 g/m ² or less, and 130 g/m ² or less. More preferably, the heating device according to any one of <60> to <71>.
<73>
The basis weight of the second sheet is preferably 10 g/m ² or more, more preferably 30 g/m ² or more, and preferably 200 g/m ² or less, and 150 g/m ² or less. More preferably, the heating device according to any one of <60> to <72>.
<74>
The oxidizable metal is preferably at least one kind of chlorides of alkali metals, alkaline earth metals or transition metals, particularly sodium chloride, potassium chloride, calcium chloride, magnesium chloride, ferrous chloride, ferric chloride. The heating device according to any one of <1> to <73>, in which at least one of iron is preferably used.

<75>
The basis weight of the oxidizable metal is preferably 100 g/m ² or more, more preferably 200 g/m ² or more, and preferably 3000 g/m ² or less, more preferably 1500 g/m ² or less, The heating tool according to any one of <1> to <74>.
<76>
The basis weight of the electrolyte is preferably 4 g/m ² or more, more preferably 5 g/m ² or more, preferably 80 g/m ² or less, more preferably 40 g/m ² or less, further preferably 30 g/m ² The heating device according to any one of <1> to <75>, which is the following.
<77>
The carbon material is at least one of activated carbon (coconut shell charcoal, charcoal powder, almond blue charcoal, peat, lignite), carbon black, acetylene black, and graphite, any one of <1> to <76> Heater described in.
<78>
The basis weight of the carbon material is preferably 4 g/m ² or more, more preferably 8 g/m ² or more, preferably 300 g/m ² or less, more preferably 80 g/m ² or less, and further preferably 50 g/m. The heating tool according to any one of the above items <1> to <77>, which is ² or less.
<79>
The water content of the heat generating layer is preferably 5% by mass or more, more preferably 10% by mass or more, preferably 45% by mass or less, more preferably 35% by mass or less, <1> to <78> The heating device according to any one of 1.
<80>
The basis weight of the base sheet is preferably 10 g/m ² or more, more preferably 35 g/m ² or more, and preferably 200 g/m ² or less, more preferably 150 g/m ² or less, The heating tool according to any one of <1> to <79>.

<81>
A plurality of first slit rows and a plurality of second slit rows are formed,
The heating device according to any one of <11> to <25>, wherein the interval between the second slit rows is larger than the interval between the first slit rows.
<82>
A plurality of first slit rows and a plurality of second slit rows are formed,
The heating device according to any one of <11> to <25>, in which the interval between the second slit rows is smaller than the interval between the first slit rows.
<83>
A plurality of first slit rows are formed in which a plurality of first slit groups each having a linear cut are arranged so as to extend in one direction, and a plurality of first slit rows are formed.
When two adjacent slit rows are viewed along the direction in which the slit rows extend, at any position, there is a slit that constitutes at least one slit row, in <6> above. The described heating equipment.

<101>
A heating layer forming step of forming a heating layer containing particles of an oxidizable metal, an electrolyte, a carbon material and water on one surface of the base sheet; and a slit forming step of forming a slit in the heating layer and the base sheet. Prepare,
The heating layer forming step includes a step of applying an electrolyte to one surface of the base material sheet, and a step of applying a paint that does not contain the electrolyte and contains particles of an oxidizable metal, a carbon material, and water. A method of manufacturing a heating device having.
<102>
The method for manufacturing a heating tool according to <101>, wherein the heating layer forming step further includes a step of supplying a water absorbing material.
<103>
The content of water is preferably 15% by mass or more, more preferably 25% by mass or more, and preferably 60% by mass or less, more preferably 45% by mass or less, based on the total mass of the coating composition. The method for manufacturing a heating tool according to <101> or <102>, in which a paint is applied.
<104>
The method for manufacturing a heating tool according to any one of <101> to <103>, in which the coating material further containing a thickener is applied.

<105>
The content of the thickener is preferably 0.05 parts by mass or more, more preferably 0.1 parts by mass or more, and preferably 10 parts by mass or less, more preferably 5 parts by mass with respect to 100 parts by mass of the coating material. The method for producing a heating tool according to <104>, which is less than or equal to parts by mass.
<106>
<101> to <105, wherein the viscosity is preferably 2000 mPa·s or more, more preferably 5000 mPa·s or more, and preferably 30,000 mPa·s or less, more preferably 15000 mPa·s or less. The manufacturing method of the heating tool as described in any one of <>.
<107>
The basis weight is preferably 180 g/m ² or more, more preferably 350 g/m ² or more, preferably 1200 g/m ² or less, more preferably 1000 g/m ² or less, further preferably 800 g/m ² or less. The method for producing a heating tool according to any one of <101> to <106>, in which the coating material is applied as described above.
<108>
The method for manufacturing a heating device according to any one of <101> to <107>, further including a second base sheet laminated on the side opposite to the base sheet with the heating layer interposed therebetween.

<109>
Particles of oxidizable metal, carbon component, a step of papermaking a composition containing water and a fiber material to form an intermediate molded article,
A step of forming an exothermic layer by containing an electrolyte in the intermediate molded body,
A method for manufacturing a heating tool, comprising a step of laminating the heat generating layer and a base material sheet to form slits in the heat generating layer and the base material sheet.
<110>
The content of particles of the oxidizable metal in the composition excluding water is preferably 10% by mass or more, more preferably 30% by mass or more, and preferably 90% by mass or less, more preferably 80% by mass. The method for producing a heating tool according to <109>, which is described below.
<111>
The content of the carbon material in the composition excluding water is preferably 1.5% by mass or more, more preferably 3% by mass or more, and preferably 15% by mass or less, more preferably 10% by mass or less. The method for manufacturing a heating tool according to <109> or <110>.
<112>
The content of the fiber material in the composition excluding water is preferably 2% by mass or more, more preferably 5% by mass or more, and preferably 80% by mass or less, more preferably 50% by mass or less, <109> The manufacturing method of a heating tool according to any one of <111>.

<113>
A step of dehydrating until the water content of the intermediate molded body is preferably 70% by mass or less, more preferably 60% by mass or less, and the lower limit thereof is preferably 5% by mass or more, more preferably 10% by mass or more. The method for manufacturing a heating tool according to any one of <109> to <112>, further including:
<114>
The method for manufacturing a heating device according to any one of <109> to <113>, in which an electrolyte is contained in an atmosphere of at least one inert gas of nitrogen and argon.
<115>
The method for manufacturing a heating tool according to any one of <109> to <114>, which uses the composition containing a water absorbing material.
<116>
The content of the water absorbing material in the composition excluding water is preferably 1% by mass or more, more preferably 3% by mass or more, and preferably 15% by mass or less, more preferably 10% by mass or less. The method for manufacturing a heating tool according to <115>.

<117>
The method further comprises the step of spraying a water absorbing material or disposing a sheet containing the water absorbing material on the surface side of the heat generating layer on which the base material sheet is not arranged to form a water absorbing material layer containing the water absorbing material. A method for manufacturing a heating tool according to any one of <109> to <114>.
<118>
The basis weight of the water-absorbent material is preferably 20 g/m ² or more, more preferably 40 g/m ² or more, preferably 100 g/m ² or less, more preferably 80 g/m ² or less, further preferably 70 g/m 2. < ² > or less, The manufacturing method of the heating tool as described in said <117>.
<119>
The method for manufacturing a heating device according to <117> or <118>, in which the second base material sheet is superposed on the surface side of the water absorbing material layer on which the heat generating layer is not arranged.

<120>
While transporting the base sheet having the heat generating layer provided on one surface in one direction, a first slit row in which a group of one or a plurality of first slits is arranged to extend in one direction is provided. The method for manufacturing a heating tool according to any one of <101> to <119>, wherein one row or a plurality of rows are formed so as to extend in the same direction as the material sheet conveyance direction.
<121>
A second slit row in which a group of one or a plurality of second slits extending in a direction intersecting with the extending direction of the first slit row is arranged to extend in one direction is defined as a conveyance direction of the base sheet. The method for manufacturing a heating tool according to <120>, wherein one row or a plurality of rows are formed so as to extend in the intersecting direction.

Hereinafter, the present invention will be described in more detail with reference to examples. However, the scope of the invention is not limited to such embodiments.

[Example 1]
A heating tool 1 was produced in which a papermaking type heat generating layer 31 made of a sheet-like material produced by the above-described papermaking type production method and a base material sheet 37 were provided with slits formed by notches penetrating in the thickness direction. The heating tool 1 of the present embodiment uses the heat-generating body 3A in which the water-absorbing material layer 2L is provided on the heat-generating layer 31 containing a mixture of particles of an oxidizable metal, an electrolyte, a carbon material, a fiber material, and water. The exothermic body 3A contains 400 g/m ² of particles of an oxidizable metal, 33 g/m ^{2 of} an electrolyte, 32 g/m ^{2 of} a carbon material, 50 g/m ^{2 of} a fiber material, and 70 g/m of a water absorbing material. m ^{2 was} included. The size of the heating element 3 was 49 mm in length×49 mm in width. The shape of the slits and the slit rows is the shape shown in FIG. 5A, the length W1 of the first slits S1 is 10 mm, the distance W2 between the first slits S1 is 1 mm, and the first slit rows L1 are The distance W3 was set to 12 mm.

[Example 2]
In this embodiment, as shown in FIG. 7A, the first slit row L1 and the second slit row L2 are provided, and the second slit S2 has a length W4 of 8 mm and the first slit S1. The heating device 1 was manufactured in the same manner as in Example 1 except that the distance W5 between the two slit rows L2 was 1 mm and the distance W6 between the second slit rows L2 was 12.25 mm.

[Example 3]
In this embodiment, as shown in FIG. 7D, the first slit row L1 and the second slit row L2 are provided, and the first slit S1 has a length W1 of 15 mm and a first slit S1. The heating tool 1 was manufactured in the same manner as in Example 2 except that the distance W2 between the slits L1 was 1 mm and the distance W3 between the first slit rows L1 was 12 mm.

[Comparative Example 1]
In this comparative example, the heating device 1 was manufactured in the same manner as in Example 1 except that the slit L1 was not formed in the heat generating layer 31 and the base material sheet 37.

[Reference Example 1]
In this reference example, the heating tool 1 was manufactured in which the coating type heat generating layer 31 manufactured by the coating type manufacturing method described above and the base material sheet 37 were formed with slits formed by notches penetrating in the thickness direction. The heating tool 1 of this reference example used the heat-generating main body 3A in which the water-absorbing material layer 2L was provided on the heat-generating layer 31 containing the particles of the oxidizable metal, the electrolyte, the carbon material, the fiber material, and the water. The exothermic body 3A contains 400 g/m ² of particles of an oxidizable metal, 33 g/m ^{2 of} an electrolyte, 32 g/m ^{2 of} a carbon material, and 70 g/m ^{2 of} a water absorbing material. The size of the heating element 3 was 49 mm in length×49 mm in width. The form of the slits and the slit rows was the same as in Example 3 except that the heating device 1 was manufactured.

[Reference Example 2]
In this reference example, a heating tool 1 including a coating type heat generating layer 31 was manufactured in the same manner as in the reference example 1 except that the slits and the shapes of the slits were the same as those in the fourth embodiment.

[Evaluation of fit]
The fit property in each example was evaluated by measuring the mounting pressure. Specifically, a pressure-sensitive sensor (manufactured by AMI Techno Co., Ltd., a mounting pressure gauge) was arranged on the brows of the face of the mannequin, which is the average of females, and on the cheekbones of the face. The mounting pressure (kPa) at each site was measured 4 times. The arithmetic mean value of the mounting pressure at each site is shown in Table 1 as a result. When the mounting pressure on the eyebrows was 0.5 kPa or more, it was determined that the fit was good, and when it was 0.7 kPa, the fit was determined to be even better. Further, the fitting pressure of the eye spot was judged to be good if the fitting pressure was 0.15 kPa or more, and was further judged to be good if the fitting pressure was 0.2 kPa or more.

[Evaluation of heat generation characteristics]
The heat generation characteristics in each example were evaluated using the rising time (45° C. temperature rising time, unit: min) and the maximum temperature reached (unit:° C.) until reaching 45° C. The specific procedure of evaluation was performed based on JIS S4100. Each evaluation was performed 8 times, and the arithmetic mean value of each data is shown in Table 1 as a result.

As shown in Table 1, it can be seen that, compared with the heating tools of the comparative examples, the heating tools of any of the examples have a higher mounting pressure and have a good fit. In particular, as shown in Examples 2 and 3, when the length of the first slit along the longitudinal direction Y of the heating tool 1 is 10 mm or more and the second slit row L2 is formed in a plurality of rows, the mounting pressure is reduced. It can be seen that the value is higher and the fitting property is more excellent.

Further, as shown in Table 1, as compared with the heating device of the comparative example, the heating device of any of the examples has a short heating time and a high maximum reaching temperature, and thus has good heat generation characteristics. I understand. In particular, as shown in Examples 2 and 3, when the length of the first slit along the longitudinal direction Y of the heating tool 1 is 10 mm or more and the second slit row L2 is formed in a plurality of rows, heat generation characteristics are obtained. It turns out that it will be even better.

Further, as shown in Table 1, the heating device of each of the examples including the paper-making type heating element 3 has the heating device 1 of Reference Examples 1 and 2 in which both the heat generation characteristics and the fitting property include the coating type heating element 3. You can see that it has improved to the same level as.

According to the present invention, there is provided a heating tool having both improved fit and improved heat generation characteristics.

Claims

A heat generating layer is provided on one surface of the base sheet,
The exothermic layer contains a mixture of oxidizable metal particles, an electrolyte, a carbon material, a fiber material and water,
A heating tool in which one or more first slits each having a linear or arcuate cut are formed in the heat generating layer and the base sheet.
The heating device according to claim 1, wherein a plurality of first slits each having a linear cut are formed on the heat generating layer and the base sheet so as to be arranged in parallel in the same direction.
The heating tool according to claim 2, wherein the one second slit formed by the notch is formed so as to extend in a direction intersecting with a direction in which the first slit extends.
The heating tool according to claim 2, wherein a plurality of second slits formed by notches are arranged in parallel facing the same direction and extend in a direction intersecting with the extending direction of the first slits.
The heating tool according to claim 4, wherein the first slit and the second slit are arranged so that the first slit and the second slit do not intersect with each other.
One or a plurality of first slit rows in which a group of a plurality of first slits formed of linear cuts are arranged to extend in one direction is formed,
The heating tool according to claim 1, wherein, when a plurality of first slit rows are formed, the first slit rows are formed so as not to intersect with each other.
A group of a plurality of second slits consisting of notches is formed in one row or a plurality of rows so that a second slit row arranged so as to extend in one direction extends in a direction intersecting with the first slit row,
The plurality of second slit rows are formed, and the second slit rows are formed so as not to intersect with each other and extend in a direction intersecting with the first slit row. Heating equipment.
The heating tool according to claim 7, wherein the first slit and the second slit are arranged so that the first slit and the second slit do not intersect with each other.
The first slit and the second slit are arranged so that the first slit in the first slit row passes between two second slits adjacent to each other in the front and rear direction in the second slit row. The heating tool according to claim 8.
The first slits and the second slits are arranged so that the second slits in the second slit row do not pass between the two first slits adjacent to each other in the front and rear direction in the first slit row. The heating device according to claim 9.
The heating device according to claim 1, wherein a plurality of first slits each having an arcuate cut are formed on the heat generating layer and the base sheet so as to be located on the same circumference.
The heating tool according to claim 1, wherein the plurality of first slits each having an arcuate cut are formed on the heat generating layer and the base sheet so as to be located on two or more concentric circles.
The heating tool according to any one of claims 1 to 12, wherein the heat generating layer further contains a water absorbing material.
The heating tool according to any one of claims 1 to 12, further comprising a water-absorbing material layer containing a water-absorbing material on the side opposite to the base sheet with the heating layer interposed therebetween.