JP2017099557A - Method of manufacturing heating implement - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method of manufacturing a heating implement which can distribute a functional agent in a desired arrangement with accuracy and can efficiently manufacture a heating implement which shows excellent heating characteristics and high functionality.SOLUTION: A method of manufacturing a heating implement 1 which includes a body part 2 comprising a first air-permeable sheet 4a positioned on a body side, a second sheet 4b, and a heating part 6 positioned between both sheets and has a functional agent 7 which can impart a specific function to a skin side surface 1a of the first sheet 4a and is covered with a separating sheet 9 includes: a functional agent filling process for filling the functional agent 7 in a recessed part 9a of an uneven sheet 9A having a first surface where a recessed part 9a and a protruding part 9b are formed; a sheet joining process for overlapping the uneven sheet 9A on a surface that becomes the skin side surface 1a of the first sheet 4a in a manner that the surface faces the recessed part 9a; and a pressurizing process for pressurizing the uneven sheet 9A from the side of a second surface 92 to press against the first sheet 4a simultaneously with the sheet joining process or after the sheet joining process.SELECTED DRAWING: Figure 6

Description

  The present invention relates to a heating tool that is attached to the body and used to warm the body, and a method for manufacturing the same.

With respect to a heating device used for warming the body by being attached to the body, the heating device holds a functional agent such as a moisturizing agent, and the functional agent is efficiently applied to the skin by the heat generated from the heating device. The technology to do is known.
For example, Patent Document 1 discloses a water vapor generating part composed of a water vapor generating composition that contains a metal powder, salts and water in a water vapor generating body applied to the skin or mucous membrane and releases water vapor when the metal powder is oxidized. It is described that an adhesive layer containing a moisturizing agent such as polyols such as glycerin, ceramides and collagens is provided on the surface to be applied to the skin or mucous membrane, and used on the skin.

  Patent Document 2 discloses a heat generating sheet in which a heat generating composition that generates heat in the presence of air is enclosed in a bag composed of an outer sheet having air permeability and an inner sheet positioned on the side to be attached to the body. There is a description in which an adhesive layer for attaching to the body is composed of adhesive portions provided at intervals. This exothermic sheet is used by spraying a chemical (functional agent) containing water from the adhesive layer side.

Patent Document 3 discloses a heat-generating gel sheet having a heat-generating layer that generates heat by an oxidation reaction and a water-containing gel layer made of a hydrophilic water-containing gel material containing cosmetics, the heat-generating layer comprising a breathable sheet and a non-breathable material. A non-breathable sheet is interposed between the heat generation layer and the water-containing gel layer, and a water absorption layer containing a water-absorbing polymer is interposed between the breathable sheet and the heat generation layer. An intercalating exothermic gel sheet is described.
For example, the exothermic gel sheet is provided to consumers by enclosing the entire hydrogel layer side with a release sheet and enclosed in an airtight envelope. In use, the exothermic gel sheet is provided as an airtight envelope. Then, the release sheet is peeled off, and the surface composed of the hydrogel layer is applied to the skin. The intake of air into the heat generating layer is performed from the breathable sheet side.

JP 2001-031559 A JP 2012-244504 A Japanese Patent Laying-Open No. 2015-084949

Examples of functional agents that can impart a specific function to the user include a moisturizing agent that imparts a function of supplying moisture to the user's skin when applied to the user's skin, a cooling sensation, and an aroma release. And those that impart a function such as an analgesic effect (anesthesia).
For example, as described in Patent Document 1, applying a moisturizing agent as a functional agent to a breathable sheet that comes into contact with air and generates heat by an oxidation reaction covers the amount of air flowing in through the sheet. This affects the heat generation characteristics of the heating device. Further, when the heat generating portion generates water vapor, it affects the water vapor generation characteristics, the amount of water vapor diffused through the breathable sheet, and the like.
Therefore, a functional agent such as a moisturizing agent is applied in a specific pattern so that a functional agent application part and a functional agent non-application part are generated, and the heat generation characteristics of the heating tool and the water vapor diffusion characteristics are appropriate. However, for example, when the amount of the functional agent applied to the heating device is relatively large, when a load is applied to the functional agent by pressurization after the functional agent is applied, Diffuse in the surface direction of the breathable sheet, and when used, the application part of the functional agent is not distributed in the desired pattern, and the heat generation characteristics and water vapor dissipation characteristics as designed are often not obtained I found out.

  Therefore, the subject of this invention is providing the manufacturing method of a heating tool and the heating tool which can eliminate the solution subject which a prior art has.

  The present invention provides a first breathable sheet positioned on the user's body side during use, a second sheet positioned on the side far from the user's body, and a position between the first sheet and the second sheet. A functional agent that can provide a specific function to the user is provided on the skin side surface that is directed to the skin side of the user when used in the first sheet, and includes a main body portion that generates heat by an oxidation reaction. A method for manufacturing a heating device in which the functional agent is coated on a release sheet, the functional agent filling for filling the concave portion of the concave-convex sheet having the first surface on which the concave portion and the convex portion are formed. Simultaneously with the merging step, the merging step of stacking the concavo-convex sheet so that the surface and the concave portion filled with the functional agent face each other on the surface to be the skin side surface of the first sheet Or after the joining step, The door, wherein the first surface comprises a pressing step of pressing under pressure from the second surface side opposite to the first sheet, there is provided a method for producing a warming device.

  The present invention also provides a breathable first sheet positioned on the user's body side during use, a second sheet positioned on the side far from the user's body, and between the first sheet and the second sheet. A functional agent that can provide a specific function to the user is provided on the skin side surface of the first sheet that is directed to the skin side of the user when used in the first sheet. The functional agent is coated with a release sheet, and the functional agent is present on the skin side surface of the first sheet in the overlapping region between the heat generating portion and the first sheet. And a functional agent non-existing part in which the functional agent is not present, the release sheet has a concave part and a convex part on the surface on the first sheet side, and the functional agent existing part in the concave part Functional agents are housed, and the convex portion is the function. And it faces the absence portion, there is provided a warming device.

According to the method for manufacturing a heating tool of the present invention, a functional agent can be accurately distributed in a desired arrangement, and a heating tool having good heat generation characteristics and high functionality can be efficiently manufactured.
The heating tool of the present invention has good heat generation characteristics and high functionality.

FIG. 1 is a plan view showing a main body part and a release sheet peeled from the main body part of an embodiment of the heating tool of the present invention. FIG. 2 is a perspective view showing a state where the heating tool shown in FIG. 1 is mounted. FIG. 3 is an exploded perspective view of the heating tool shown in FIG. 1. FIG. 4 is a cross-sectional view taken along the line IV-IV showing the state of the heating tool shown in FIG. 1 before peeling the release sheet from the main body. FIG. 5 is an enlarged cross-sectional view of the vicinity of the skin side surface of the first sheet of the heating tool shown in FIG. FIG. 6 is a schematic view showing an embodiment of the method for manufacturing a heating tool of the present invention. Fig.7 (a)-FIG.7 (c) are explanatory drawings of the uneven | corrugated sheet manufacturing process in the manufacturing method of the heating tool shown in FIG. FIG. 8 is an explanatory diagram of a functional agent filling step in the method of manufacturing the heating tool shown in FIG. FIG. 9 is an explanatory diagram of a merging step and a pressurizing step in the method for manufacturing the heating tool shown in FIG. FIG. 10 is a schematic view showing an apparatus for measuring the amount of water vapor generated from the heating tool. FIG. 11 is a view corresponding to FIG. 7C showing another example of the uneven sheet used in the present invention. FIG. 12 is a graph showing the results of Examples and Comparative Examples.

Hereinafter, the present invention will be described based on preferred embodiments thereof.
First, about the manufacturing method of the heating tool of this invention, an example of the heating tool manufactured by one preferable embodiment is demonstrated.
A heating tool 1 shown in FIG. 1 is a so-called eye mask type steam heating tool. As shown in FIG. 2, the steam heated to a predetermined temperature is brought into contact with the human eye and its surroundings, and the eye and its surroundings. And is used for transferring the moisturizing agent 7 as a functional agent to the skin and allowing it to penetrate. As shown in FIGS. 1 to 4, the heating tool 1 has a flat shape. The heating tool 1 has a longitudinal direction X and a width direction Y orthogonal to the longitudinal direction X, and has a long shape along the longitudinal direction X. The heating tool 1 has a main body 2 in the central region in the longitudinal direction X thereof. In the heating device 1 of the present embodiment, the longitudinal direction X coincides with the cross direction CD orthogonal to the flow direction in the preferable manufacturing method described later, and the width direction Y matches the flow direction MD in the preferable manufacturing method described later. ing.
The main body 2 is also flat and has a long shape along the longitudinal direction X. The heating tool 1 has ear hooks 3 and 3 at each end in the longitudinal direction X. The ear hook 3 extends from the position of the end in the longitudinal direction X in the main body 2 toward the outside in the longitudinal direction X. Each ear hook 3 is formed with a slit 3a. The slit 3a is opened when the heating tool 1 is worn, and is used to pass the user's ear through the opening.

  The main body 2 has a first sheet 4a and a second sheet 4b. These sheet members are members forming the outermost surface of the main body 2, the first sheet 4 a is a sheet positioned on the user's body side during use, and the second sheet 4 b is far from the user's body. It is a sheet located on the side. The first sheet 4a and the second sheet 4b have the same shape in the width direction Y. On the other hand, with respect to the longitudinal direction X, the second sheet 4b extends outward in the longitudinal direction X beyond the respective edges 4a 'and 4a' of the first sheet 4a. And the extension site | part becomes the ear hook part 3 mentioned above. In the first sheet 4a and the second sheet 4b, at least the peripheral area of the first sheet 4a is joined to the second sheet 4b.

A heating element 5 is disposed between the first sheet 4a and the second sheet 4b. The heating element 5 has a flat shape and is rectangular in plan view. The heating element 5 includes a first packaging material 5a and a second packaging material 5b. The first packaging material 5a is located on the first sheet 4a side, and the second packaging material 5b is located on the second sheet 4b side.
The first packaging material 5a and the second packaging material 5b have the same shape. The first wrapping material 5a and the second wrapping material 5b may each be provided with a portion having air permeability, or only one of them is provided with a portion having air permeability, and the other is difficult to breathe. Or non-breathable. In the latter case, the first wrapping material 5a, which is a wrapping material located on the first surface 1a side, is preferably provided with a portion having air permeability.

  A heat generating portion 6 is disposed between the first packaging material 5a and the second packaging material 5b. The heating part 6 is also rectangular in plan view. The first wrapping material 5a and the second wrapping material 5b have extending portions extending outward from the edge of the heat generating portion 6, and the extending portions of the respective wrapping materials 5a and 5b are joined to each other. Thus, the heating element 5 is formed. In addition, leakage to the outside of the heating element 5 is prevented by this joining.

  The main body 2 includes two heating elements 5. The two heating elements 5 are arranged along the longitudinal direction X. Each heating element 5 is preferably arranged so as to be positioned on the user's eyeball when the heating tool 1 is mounted on the user's face in the manner shown in FIG. 3. In addition, each heating element 5 is disposed at a symmetrical position with respect to the center line CL along the width direction Y in the heating device 1. Each heating element 5 is formed by joining a second wrapping material 5b that constitutes the heating element 5 to a second sheet 4b that is a member facing the second wrapping material 5b to form a joint portion 5c. It is fixed to the main body 2. In order to fix the heating element 5 and the packaging material 5a or the packaging material 5b, it is preferable to provide the bonding part 5c at least at one of the peripheral part or the central part for each heating element 5.

  The 1st sheet | seat 4a which comprises the main-body part 2 is provided with the moisturizing agent 7 to the skin side surface 1a orient | assigned to a user's skin side at the time of use. In a region where the heat generating portion 6 and the first sheet 4a overlap in plan view (hereinafter, this region in the first sheet 4a is referred to as “overlap region”), the moisturizing agent 7 is applied discontinuously. That is, the 1st sheet | seat 4a contains the functional agent presence part 8a and the functional agent non-existence part 8b in the overlap area | region. 1 is formed in a stripe shape extending along the width direction Y, and the functional agent existence portions 8a and the functional agent non-existence portions 8b are alternately formed in the longitudinal direction X. .

  The direction in which each functional agent existence portion 8a extends is preferably the width direction Y of the heating tool 1, which is the direction corresponding to the flow direction MD at the time of manufacture. Each functional agent existence portion 8a has an elongated rectangular shape having a width and a length, and the functional agent existence portions 8a have substantially the same width. The widths of the functional agent existence portions 8a are preferably substantially equal from the viewpoint of appearance, but may be different. The area between the adjacent functional agent existing portions 8a, that is, the width of the functional agent non-existing portion 8b is the same as or different from the width of the functional agent existing portion 8a. Further, the widths of the functional agent non-existing portions 8b are almost equal. The widths of the functional agent non-existing portions 8b are preferably substantially equal from the viewpoint of appearance, but may be different.

  As shown in FIG. 5, it is preferable that the moisturizing agent 7 which is a functional agent is provided with a thickness on the skin side surface 1a of the first sheet 4a. By applying the moisturizing agent 7 in this manner, the moisturizing agent 7 can easily be successfully transferred to the user's skin in the usage state of the heating tool 1. In order to apply the humectant 7 with a thickness, the humectant 7 has a fine structure to adjust the structural viscosity, or a water-soluble polymer is added to adjust the viscosity according to the consistency of the aqueous phase. An emulsion may be used. The fact that the humectant 7 is applied with a thickness does not mean that the humectant 7 is in a non-penetrating state within the first sheet 4a. Part of the humectant 7 may penetrate into the first sheet 4a.

  In the state before using the heating tool 1, as shown in FIGS. 4 and 5, the moisturizing agent 7 applied to the skin side surface 1a of the first sheet 4a is covered with the release sheet 9. In the heating tool 1 of the present embodiment, the release sheet 9 and the first sheet 4a have the same shape in the width direction Y. On the other hand, with respect to the longitudinal direction X, the length of the release sheet 9 is equal to or less than the first sheet 4a. The release sheet 9 has a line-symmetric shape with respect to the center line CL along the width direction Y in the heating tool 1, and has an overlapping region of the heat generating portion 6 and the first sheet 4a on each side of the center line CL. doing. The release sheet 9 covers the functional agent existence portion 8a and the functional agent non-existence portion 8b in each of the two overlapping regions. In addition, the peeling sheet 9 may be divided | segmented into the both sides of the center line CL, or may be divided into right and left in the vicinity of the center line CL by a perforation or a slit.

As shown in FIG. 5, the release sheet 9 has a concave portion 9 a and a convex portion 9 b on the surface on the first sheet 4 a side in each of the portions covering the two overlapping regions of the first sheet 4 a. And the moisturizing agent 7 which exists in the functional agent existence part 8a is accommodated in each recessed part 9a, and the convex part 9b is facing the functional agent non-existing part 8b.
As shown in FIG. 1, each recess 9 a of the release sheet 9 extends in the width direction Y of the heating tool 1, which is the same direction as the extension direction of the functional agent existence portion 8 a, and the recess 9 a The convex portions 9 b are alternately formed in the longitudinal direction X of the heating tool 1. Each recess 9a has an elongated rectangular shape having a width and a length, and the plurality of recesses 9a have substantially the same width. In the release sheet 9, a region between adjacent concave portions 9 a in the longitudinal direction X of the heating tool 1 is a convex portion 9 b, and the width of the convex portion 9 b is the same as or different from the width of the concave portion 9 a. . The plurality of convex portions 9b have substantially the same width. In addition, the widths of the individual concave portions 9 a and the convex portions 9 b formed between adjacent concave portions are substantially uniform in the width direction Y of the heating tool 1. In addition, since the process is easy, it is preferable that the direction where the recessed part 9a is extended corresponds with the flow direction (MD) at the time of manufacturing the peeling sheet 9 which has an unevenness | corrugation. In addition, it is preferable that the direction in which the concave portion 9a extends coincides with the flow direction of the first sheet 4a at the time of manufacturing the heating tool 1 from the viewpoint of efficient filling of the functional agent.

  In the heating tool 1 of the present embodiment, as shown in FIG. 5, the recess 9a of the release sheet 9 has a width W1, that is, the length along the longitudinal direction X of the heating tool 1 is the width of the functional agent existence part 8a. The width W2 of the convex portion 9b matches the width of the functional agent non-existing portion 8b.

  The width of the functional agent existence portion 8a and the width of the concave portion 9a can be appropriately determined according to the heat generation characteristics to be imparted to the heating tool 1, the water vapor diffusion characteristics, and the like, and are not particularly limited. The width of each is preferably 2 mm or more, more preferably 2.5 mm or more, and still more preferably 3 mm or more. Moreover, it is preferable that it is 7.5 mm or less, it is still more preferable that it is 6.5 mm or less, and it is still more preferable that it is 5.5 mm or less. For example, the widths of the functional agent existence portion 8a and the concave portion 9a are each preferably 2 mm or more and 7.5 mm or less, more preferably 2.5 mm or more and 6.5 mm or less, and 3 mm or more and 5.5 mm or less. More preferably.

  Further, the width of the functional agent non-existing portion 8b located between the adjacent functional agent existing portions 8a and the width of the convex portion 9b are preferably 2.5 mm or more, more preferably 3.5 mm or more, More preferably, it is 4.5 mm or more. Further, it is preferably 10 mm or less, more preferably 9 mm or less, and still more preferably 8 mm or less. For example, the width of the functional agent non-existing portion 8b and the convex portion 9b is preferably 2.5 mm or more and 10 mm or less, more preferably 3.5 mm or more and 9 mm or less, and 4.5 mm or more and 8 mm or less. More preferably.

  In addition, in FIG.1, FIG3 and FIG.4, as the recessed part 9a of the peeling sheet 9, the length of the width direction Y along the flow direction MD of the 1st sheet | seat 4a at the time of manufacture is the same direction of the functional agent presence part 8a. The concave portion 9a and the convex portion 9b of the release sheet 9 may be formed so as to extend from one end edge to the other end edge in the width direction Y of the release sheet 9, In this case, the functional agent such as the moisturizing agent 7 may be accommodated only in a part of the central portion of the concave portion 9a in the extending direction of the concave portion 9a.

  According to the heating tool 1 of the present embodiment, the moisturizing agent 7 functions on the skin side surface 1a of the first sheet 4a, in particular, on the skin side surface 1a of the first sheet 4a in the overlapping region of the heat generating portion 6 and the first sheet 4a. The agent present portion 8a and the functional agent non-existing portion 8b are formed so that the functional agent existing portion 8a and the functional agent non-existing portion 8b are covered with the release sheet 9 having irregularities, and the concave portion 9a Since the moisturizing agent 7 of the functional agent existing part 8a is accommodated and the convex part 9b faces the functional agent non-existing part 8b, the user peels the release sheet 9 from the main body part 2 for use. In the meantime, the moisturizing agent 7 is prevented from receiving a load and spreading in the surface direction of the first sheet 4a. Thereby, for example, even when pressure is applied to the heating device 1 during the distribution process in a state where it is enclosed in a non-breathable exterior bag, or during storage or carrying by a consumer, The area ratio between the agent present portion 8a and the functional agent non-existing portion 8b is maintained, and when the release sheet 9 is peeled from the main body portion 2 for use, good heat generation characteristics or water vapor diffusion characteristics as designed are obtained. It is done.

  The release sheet 9 is releasably bonded onto the first sheet 4a. However, when the release sheet 9 is peeled off, the functional agent 7 in the recess 9a can be left on the first sheet 4a. The release sheet 9 may or may not be subjected to a release treatment on the surface on the first sheet 4a side. For example, when the functional agent is difficult to combine with the material of the sheet material constituting the release sheet 9, the transfer to the first sheet 4 a is smooth even if the release sheet 9 is not subjected to the release treatment. To be done.

From the viewpoint of facilitating the supply of oxygen to the heat generating part through the functional agent non-existing part, improving the heat generating characteristics of the heat generating part, and giving a sufficient warm feeling to the user, the heat generating part As a result of more sufficient heat generation, a large amount of water vapor is generated, and generation of water vapor to the outside through the functional agent non-existing portion becomes smooth, so that water vapor can efficiently reach the user's skin. From the viewpoint of allowing a relatively large amount of functional agent to be retained in the overlapping region, and when the functional agent is a moisturizing agent, a large amount of moisturizing agent can be transferred to the user's skin. 1 preferably has the following configuration.
That is, the area ratio of the functional agent existence portion 8a in the overlapping region between the heat generating portion 6 and the first sheet 4a is preferably 20% or more, more preferably 30% or more, and still more preferably with respect to the area of the overlapping region. Is 35% or more, preferably 75% or less, more preferably 60% or less, still more preferably 55% or less, and preferably 20% or more and 75% or less, more preferably 30% or more and 60% or less. More preferably, it is 35% or more and 55% or less.
From the same viewpoint, the area ratio of the concave portion 9a filled with the functional agent in the overlapping region between the heat generating portion 6 and the first sheet 4a is preferably 20% or more, more preferably, with respect to the area of the overlapping region. 30% or more, more preferably 35% or more, preferably 75% or less, more preferably 60% or less, still more preferably 55% or less, and preferably 20% or more and 75% or less, more preferably 30% to 60%, more preferably 35% to 55%.
The ratio of these areas is calculated by calculating the area by measuring the size of the functional agent existing portion or the concave portion with calipers or the like in the region where the heat generating portion and the first sheet overlap in plan view, and calculating the ratio to the area of the heat generating portion. It can be calculated and measured.

Next, a preferred embodiment of the method for manufacturing a heating tool of the present invention will be described by taking the case of manufacturing the heating tool 1 described above as an example.
As shown in FIG. 6, the manufacturing method according to the present embodiment includes a concavo-convex sheet manufacturing process performed in the concavo-convex sheet manufacturing section 10, a functional agent filling process performed in the functional agent filling section 20, and a merging performed in the merging section 40. The process, the pressurization process performed in the confluence | merging part 40 or the pressurization part 50, and the cutting process after a pressurization process are provided.

This will be described in more detail below.
In the uneven sheet manufacturing process, as shown in FIG. 7A and FIG. 7B, a flat raw material sheet 9B made of synthetic resin is narrowed between a pair of shaping rolls 12 and 13, An uneven sheet 9A having a cross-sectional shape shown in 7 (c) is obtained. On the peripheral surfaces of the pair of shaping rolls 12 and 13, irregularities for deforming the raw material sheet 9B into an irregular sheet 9A having a cross-sectional shape shown in FIG. More specifically, on the peripheral surface of one shaping roll 12, a convex portion 12 a for forming the concave portion that becomes the concave portion 9 a of the release sheet 9 described above, and a convex portion that becomes the convex portion 9 b of the release sheet 9. And a convex portion 13a for pushing a part of the raw material sheet 9B into the concave portion 12b of the one shaping roll 12 on the peripheral surface of the other shaping roll 13. A concave portion 13b into which a part of the raw material sheet 9B is pushed by the convex portion 12a of one shaping roll 12 is formed.
The pair of shaping rolls 12 and 13 are preferably capable of imparting to the raw material sheet 9B a pressure and temperature that can plastically deform the raw material sheet 9B into an uneven shape. For example, the raw material sheet 9B is a thermoplastic resin. When it is made, it is preferable to heat one or both of the shaping rolls 12 and 13 at a temperature lower than the melting point of the thermoplastic resin in a softening temperature range.
7A to 7C show only a part of the pair of shaping rolls in the axial direction and a part of the raw material sheet 9B in the width direction.

By heating and pressurizing with one or both of the shaping rolls 12 and 13, a concavo-convex sheet 9A having a cross-sectional shape shown in FIG. 7C is obtained. The concavo-convex sheet 9A may have the cross-sectional shape shown in FIG. 7C over the entire area in the flow direction, or intermittently has a cross-sectional portion shown in FIG. 7C in the flow direction. May be. In order to manufacture the heating tool 1 described above, it is preferable to form an uneven region having recesses 9a intermittently in the flow direction.
The concavo-convex shaped uneven sheet 9 </ b> A is conveyed by a known conveying means (not shown) and introduced into the functional agent filling unit 20. In FIG. 6, the code | symbol 14 has shown the roll for suppressing the meandering of the uneven | corrugated sheet | seat 9A in conveyance.

In the functional agent filling step, as shown in FIG. 8, a functional agent such as a humectant 7 is filled into the concave portion 9a of the concave-convex sheet 9A obtained in the concave-convex sheet manufacturing step. Although FIG. 6 illustrates a filling method using a die coater, a filling method such as a die coater, a dispenser, or a knife coating can be used for this filling. The functional agent is preferably filled in an amount that does not overflow from the individual recesses 9a. Further, the functional agent may be filled as it is, or a functional agent dissolved in a solvent may be filled.
In the merging step, as shown in FIGS. 6 and 9, the surface and the concave portion 9a filled with the functional agent 7 face each other on the surface to be the skin side surface 1a in the first sheet 4a in the band shape. Thus, the uneven sheets 9A are stacked.
In the embodiment shown in FIG. 6, the heating element 5 is intermittently arranged on the belt-like second sheet 4b that has been continuously conveyed, and the belt-like second sheet that has been continuously conveyed separately on the second sheet 4b. A main body continuous body 2C on which one sheet 4a is overlaid is introduced into the merging section 40. In the merging section 40, a concave portion filled with the functional agent 7 on the first sheet 4a of the main body continuous body 2C. 9 A of uneven | corrugated sheet | seats which have 9a are piled up.

In the pressurizing step, the concave-convex sheet 9 </ b> A is formed into the concave portion 9 a by the pressurizing roll 51 disposed in the merging unit 40 or the pressurizing roll 52 disposed in the pressurizing unit 50 located downstream of the merging unit 40. And it pressurizes from the 2nd surface 1b side on the opposite side to the 1st surface 1a side in which the convex part 9b is formed, and presses it against the 1st sheet | seat 4a.
In the example shown in FIG. 6, the total of the main body continuous body 2 </ b> C and the concavo-convex sheet 9 </ b> A that introduces the distance between the pressure roll 51 disposed in the junction 40 and the conveying surface of the belt conveyor 60 between them. By making it narrower than the thickness, the uneven sheet 9A is pressed against the portion of the first sheet 4a that overlaps the heat generating portion 6. Moreover, the pressure roll 52 pressurizes the first sheet 4a and the second sheet 4b at a portion where the heating element 5 does not exist, and an adhesive (not shown) applied to the first sheet 4a or the second sheet 4b. The two sheets 4a and 4b are joined to each other around the individual heating elements 5 or around the two heating elements 5, but the overlapping area between the heating part 6 and the first sheet 4a is pressurized. When passing the lower part of the roll 52, the uneven sheet 9A is pressed against the portion of the first sheet 4a that overlaps the heat generating part 6. As the pressure roll 52, a roller whose outer peripheral portion is made of a flexible material such as urethane foam is preferably used. The pressurization step in the present invention is not limited to the one performed only for pressurization, and the uneven sheet 9A is pressed against the first sheet 4a in an operation performed for any purpose after the merging step. If there is, the process in which the operation is performed is also a processing process. There is no particular limitation on the number of processing steps.

  In the cutting step, a continuous laminated body 1A in which strip-shaped uneven sheets 9A are continuously laminated on the main body continuous body 2C is punched into a predetermined shape with a rotary die cutter or the like (not shown), and the intended heating tool 1 is obtained. can get.

  According to the manufacturing method of the present embodiment, as shown in FIG. 9, the functional agent 7 filled in the concave portion 9a by the convex portion 9b adjacent to the concave portion 9a of the concave-convex sheet 9A is formed in the first sheet during the manufacturing process. Since it is suppressed that it spreads in the surface direction of 4a, a functional agent can be correctly distributed by the desired arrangement | positioning determined beforehand. As a result, the area ratio between the functional agent existing part and the functional agent non-existing part can be made as designed, and a heating device with good heat generation characteristics and good function addition to the user by the functional agent can be efficiently produced. can do.

  In the merging step, the concave and convex sheet 9A after the functional agent filling step is formed on the concave portion 9a filled with the functional agent 7 on the overlapping region between the heat generating portion 6 and the first sheet 4a in the heating element 5 and the concave portion 9a. It is preferable to superimpose so that the adjacent convex parts 9b and 9b may be located. The overlapping region between the heat generating portion 6 and the first sheet 4a is a portion that dissipates a relatively large amount of heat and steam, but there are many occasions where pressure is applied in the manufacturing process or the distribution process after the manufacturing process. By placing the functional agent 7 in the state of being accommodated in the recess 9a on the overlapping region and suppressing the diffusion of the functional agent 7 due to pressurization, the effects of heating and water vapor and the effect of the functional agent are even better expressed. Is done.

In the present invention, the heat generating part 6 is accompanied by generation of water vapor during heat generation, and the first sheet 4a preferably has moisture permeability.
By arranging the functional agent 7 in the recess 9a so as not to expand in the surface direction on the first sheet 4a having moisture permeability, a water vapor flow path can be reliably ensured and applied to the skin of the user. The thermal effect can be further improved.
The generated water vapor is preferably released to the outside through the first sheet and reaches the user's skin. Specifically, the amount of water vapor generated through the outermost layer located on the skin side when using the heating tool is preferably 20 mg / (25 cm ² · 10 min) or more, and is 30 mg / (25 cm ² · 10 min) or more. It is more preferable. Further, the upper limit value of the amount of water vapor generated is, for example, preferably 300 mg / (25 cm ² · 10 min) or less, and more preferably 210 mg (25 cm ² · 10 min) or less. Among them, it is more preferably ^{preferably, 30mg / (25cm 2 · 10min} ) or 210mg ^(25cm 2 · 10min) below is 20mg ^/ (25cm 2 · 10min) or 300mg ^/ (25cm 2 · 10min) below . In order to generate such a large amount of water vapor, for example, the amount of water contained in the heat generating portion may be set within the above-described range.

  The amount of water vapor generated from the heating tool is measured as follows using the apparatus 30 shown in FIG. An apparatus 30 shown in FIG. 10 includes an aluminum measurement chamber (volume 2.1 L) 31, an inflow path 32 for allowing dehumidified air (humidity less than 2%, flow rate 2.1 L / min) to flow into the lower portion of the measurement chamber 31, An outflow path 33 through which air flows out from the upper part of the measurement chamber 31 is provided. An inlet temperature / humidity meter 34 and an inlet flow meter 35 are attached to the inflow path 32. On the other hand, an outlet temperature / humidity meter 36 and an outlet flow meter 37 are attached to the outflow passage 33. A thermometer (thermistor) 38 is attached in the measurement chamber 31. A thermometer having a temperature resolution of about 0.01 ° C. was used. At a measurement environment temperature of 30 ° C. (30 ± 1 ° C.), the heating tool is taken out of the packaging material and placed in the measurement chamber 31 with its water vapor release surface facing up. A thermometer 38 with a metal ball (4.5 g) is placed on it. In this state, dehumidified air is flowed from the lower part of the measurement chamber 31. A difference in absolute humidity before and after the air flows into the measurement chamber 31 is obtained from the temperature and humidity measured by the inlet temperature and humidity meter 34 and the outlet temperature and humidity meter 36. Further, the amount of water vapor released by the heating tool is calculated from the flow rates measured by the inlet flow meter 35 and the outlet flow meter 37. Details of this apparatus are described in Japanese Patent Application Laid-Open No. 2004-73688, which is related to the earlier application of the present applicant. The following formula is used to calculate the amount of water vapor.

Here, U (% RH): relative humidity, e (Pa): water vapor pressure, es (Pa): saturated water vapor pressure, D (g / m ³ ): absolute humidity, P (L): unit air capacity, S (S): Sampling cycle, A (g): Water vapor amount.

  In the manufacturing method of the heating tool 1 shown in FIG. 6, the concave-convex sheet 9A manufactured in the concave-convex sheet manufacturing process and merged with the first sheet 4a in the merging process has the concave part 9a filled with the functional agent 7, Extending in the flow direction MD of one sheet 4a, the concave portions 9a and the convex portions 9b are alternately formed in a cross direction CD orthogonal to the flow direction of the first sheet 4a.

  When the concave / convex sheet 9 having the concave portions 9a and the convex portions 9b extending in the flow direction MD of the first sheet 4a is used, processing of the functional agent filling process is facilitated and the functional agent can be efficiently filled.

  Further, the uneven sheet 9A preferably has a height difference h [see FIG. 7 (c)] between the concave portion 9a and the convex portion 9b from the viewpoint of suppressing the spread of the functional agent 7 and improving the transferability to the first sheet 4a. 0.1 mm or more, more preferably 0.4 mm or more, and preferably 3 mm or less, more preferably 0.6 mm or less, and preferably 0.1 mm or more and 3 mm or less, more preferably 0.4 mm or more and 0.4 mm or less. 6 mm or less.

  From the viewpoint of forming the uneven sheet 9A having a high effect of suppressing the spread of the functional agent, the raw material sheet 9B has a thickness of preferably 0.2 mm or more, more preferably 1 mm or more, and preferably 5 mm or less, more preferably 2 mm or less, preferably 0.2 mm or more and 5 mm or less, more preferably 1 mm or more and 2 mm or less.

As shown in FIG. 7, the uneven sheet 9A used in the preferred embodiment of the manufacturing method of the present invention has a first surface 91 on the side having the recess 9a filled with the functional agent, and a surface on the opposite side to the first surface 91. When the second surface 92 is used, the pressure buffering convex portion 9c is provided on the second surface 92 side between the concave portions 9a adjacent to each other in the direction CD perpendicular to the flow direction MD of the first sheet 4a.
Since the uneven sheet 9A has the pressure buffering convex portion 9c, the functional agent 7 accommodated in the concave portion 9a is further less likely to spread with respect to the pressurizing step during manufacturing and post-manufacturing pressurization.
From the viewpoint of suppressing the spreading of the functional agent 7, the pressure buffering convex portion 9c has a thickness Tc in a portion having the pressure buffering convex portion 9c in the uneven sheet 9A, and a thickness Ta of a portion having the concave portion 9a on the first surface 91 side. It is preferable that it is thicker. The thickness Tc is preferably 1.2 times or more, more preferably 1.5 times or more, preferably 3 times or less, more preferably 2 times or less, and preferably 1.2 times the thickness Ta. It is 3 times or less, more preferably 1.5 times or more and 2 times or less.

In addition, the concave-convex sheet 9A shown in FIG. 7 does not overlap the concave portion 9a on the first surface 91 side between the concave portions 9a adjacent to each other in the cross direction CD orthogonal to the flow direction MD of the first sheet 4a on the second surface 92 side. It has a pressure buffering convex portion 9c, a second surface side convex portion 9d that overlaps the concave portion 9a on the first surface 91 side, and a second surface side concave portion 9e that does not overlap the concave portion 9a on the first surface 91 side. ing. The concavo-convex sheet 9A has a second surface side concave portion 9e on each side of the pressure buffering convex portion 9c in the cross direction CD.
The pressure buffering convex portion 9c has a length Lc along the intersecting direction CD, and the length Lc along the intersecting direction CD of each of the second surface side concave portions 9e located on both sides of the pressure buffering convex portion 9c. When the pressure buffering convex portion 9c receives pressure, the pressure buffering convex portion 9c easily falls into the second surface side concave portion 9e, and it is difficult to apply pressure to the second surface side convex portion 9d. Is preferable from the viewpoint of ensuring. From this point of view, the pressure buffering convex portion 9c has a length Lc along the intersecting direction CD, and the length Lc along the intersecting direction CD of each of the second surface side concave portions 9e located on both sides of the pressure buffering convex portion 9c. More preferably, it is less than Le.
In addition, the pressure buffering convex portion 9c preferably has a length Lc along the intersecting direction CD shorter than a length Ld along the intersecting direction CD of the second surface side convex portion 9d. It is preferably less than half of Ld.
Since the uneven sheet 9A has the pressure buffering convex portion 9c, the functional agent 7 accommodated in the concave portion 9a becomes more difficult to spread in the pressurizing process during manufacturing and the pressurizing after manufacturing.

Various materials used for the heating tool of the present invention and the manufacturing method thereof will be described.
Both the first sheet 4a and the second sheet 4b may be air permeable, or the first sheet 4a is air permeable and the second sheet 4b is air permeable or difficult. It may be breathable. Which one should be adopted may be determined according to the specific application of the heating tool. In the case where the first sheet 4a and / or the second sheet 4b have air permeability, the air permeable sheet has only a part such as a portion overlapping the heat generating portion instead of the entire area having air permeability. May have air permeability. In addition, for the breathable portion (entire or part) of the breathable sheet, for example, a fiber sheet such as a nonwoven fabric or a porous synthetic resin sheet can be used. As a nonwoven fabric, an air through nonwoven fabric, a spun bond nonwoven fabric, a melt blown nonwoven fabric, a spunlace nonwoven fabric, etc. can be used, for example. The porous synthetic resin sheet is preferably a so-called moisture-permeable sheet that is generally hardly permeable to water and has water vapor permeability. In general, a moisture-permeable sheet is obtained by melt-kneading a thermoplastic resin and a powder that is not compatible with the thermoplastic resin, and extruding the kneaded product into a film to form a molded body. Alternatively, it can be obtained by biaxial stretching. When the first sheet and / or the second sheet has a portion made of a moisture permeable sheet, a fiber sheet such as a nonwoven fabric may be laminated on the outer surface of the portion. By carrying out like this, the touch of a heating tool can be improved. As such a fiber sheet, an air through nonwoven fabric etc. are mentioned as a suitable thing, for example.

  When either one of the first sheet and the second sheet is non-breathable or non-breathable, for example, a thermoplastic resin sheet can be used as the sheet. Such a sheet is hardly permeable or impermeable to water, and is also hardly permeable or impermeable to air and water vapor. A fiber sheet such as a nonwoven fabric may be laminated on the outer surface of the sheet as necessary to improve the touch of the heating tool.

  The heat generating part of the heating tool preferably uses heat generated by the oxidation reaction of the oxidizable metal as a heat source. In that case, it is preferable that a heat-emitting part is comprised with the heat-generating composition containing an oxidizable metal and water. As the oxidizable metal, it is preferable to use a metal that generates heat of oxidation reaction. Examples of such a metal include one or more selected from iron, aluminum, zinc, manganese, magnesium, and calcium. These metals are used in the form of powder or fiber, for example. Among these metals, iron is preferably used from the viewpoints of handleability, safety, manufacturing cost, storage stability and stability, and iron is particularly preferably used in the form of powder, that is, in the form of iron powder. As the iron powder, for example, one or more selected from reduced iron powder and atomized iron powder are preferably used.

  When the oxidizable metal is powder, the average particle size is preferably 10 μm or more, more preferably 20 μm or more, and preferably 200 μm or less, from the viewpoint of efficient oxidation reaction. More preferably, it is 150 μm or less. For example, the average particle size of the oxidizable metal powder is preferably 10 μm or more and 200 μm or less, and more preferably 20 μm or more and 150 μm or less. The particle size of the oxidizable metal is the maximum transverse length in the form of powder, and is measured by classification with a sieve, dynamic light scattering method, laser diffraction method or the like.

The content of the oxidizable metal in the heat generating part is preferably 100 g / m ² or more, more preferably 200 g / m ² or more, expressed as basis weight. The content of oxidizable metal in the heat generating portion, is preferably 3000 g / ^{m 2} or less, and more preferably 1600 g / ^{m 2} or less. For example the content of the oxidizable metal is preferably at 100 g / ^{m 2} or more 3000 g / ^{m 2} or less, more preferably 200 g / ^{m 2} or more 1600 g / ^{m 2} or less. Thereby, the heat generation temperature of the heat generating part can be raised to a desired temperature. The content of the oxidizable metal can be determined by an ash content test according to JIS P8128 (1995 revised edition) or a thermogravimetric instrument. In addition, it can be quantified by a vibration sample type magnetization measurement test or the like using the property that magnetization occurs when an external magnetic field is applied.

  The heat generating portion contains water together with the oxidizable metal. Since water easily moves to a member other than the heat generating part during storage of the heating tool, and further easily moves to the water contained in the moisturizing composition applied to the first surface, It is difficult to measure only the content of added water. On the other hand, in the heat generation due to the oxidation reaction, all water given to the heating tool is used. Therefore, in the present invention, the amount of water contained in the whole heating tool is expressed based on the mass of the oxidizable metal in the heat generating portion. Specifically, the amount of water contained in the whole heating tool is preferably 40 parts by mass or more and 150 parts by mass or less, and 40 parts by mass or more and 120 parts by mass or less with respect to 100 parts by mass of the oxidizable metal. More preferably. By containing water in an amount within this range, a large amount of water vapor can be generated when the heat generating part generates heat.

  In addition to the oxidizable metal and water, the heat generating part preferably contains a water retaining material. The water retaining material is made of a material capable of retaining water. In the present invention, the water retaining material refers to a material that can absorb and retain 5 times or more of pure water with respect to its own weight. Particularly preferred as such a material is a water-absorbing polymer, which is a material having a very high water holding capacity and a property of discharging water by changing heat or salt concentration. The water retaining material can be contained alone in the heat generating part, and can also be contained in the heat generating part in the form of a water absorbent polymer sheet in which a water absorbent polymer is arranged in a layer between two water absorbent sheets. As such a water-absorbing polymer sheet, for example, those described in JP-A-8-246395 can be used.

  It is preferable that the exothermic part further contains a carbon component from the viewpoint of water retention ability, oxygen supply ability and catalytic ability. As a carbon component, the 1 type (s) or 2 or more types chosen from activated carbon, acetylene black, and graphite can be used, for example. Among these carbon components, activated carbon is preferably used from the viewpoint of easily adsorbing oxygen when wet and maintaining the moisture in the heat generating part constant. More preferably, activated carbon made of one or more fine powders or small particles selected from coconut shell charcoal, wood powder charcoal, and peat charcoal is used. The carbon component content in the heat generating part is preferably 0.3 parts by mass or more and 20 parts by mass or less with respect to 100 parts by mass of the oxidizable metal.

  The heat generating part may contain a reaction accelerator in addition to the above-described components. Moreover, surfactant, a chemical | medical agent, a coagulant | flocculant, a coloring agent, a paper strength enhancer, a pH adjuster, a bulkiness agent etc. can further be included as needed.

  As a heating agent manufactured by the method for manufacturing a heating tool of the present invention or a functional agent used for the heating tool of the present invention, a predetermined sense such as a medicinal effect, a moisturizing effect, a cooling sensation, and a warm sensation is given to the user. The thing which gives is mentioned. In addition to the moisturizing agent in the above-described heating device 1, that is, a moisturizing agent that provides a function of imparting moisture to the user's skin when applied to the user's skin, cooling feeling, analgesic effect, and refreshing due to aroma generation Examples include menthol, which imparts a feeling imparting function.

  As the humectant, for example, those similar to those used so far in the field of cosmetics and pharmaceuticals can be used without particular limitation. For example, water-soluble organic acids, water-soluble organic acid salts, polyhydric alcohols and the like are listed as hydrophilic components, while ceramides, collagens, higher alcohols, higher fatty acids, ester oils, hydrocarbons are used as lipophilic components. And silicones. These humectants can be used alone or in combination of two or more.

  Examples of the water-soluble organic acid include L-glutamine, L-glutamic acid, citric acid, succinic acid, tartaric acid, serine, tannic acid, L-tyrosine, lactic acid, uric acid, paraaminobenzoic acid, L-valine, hyaluronic acid, Hydroxyethanediphosphonic acid, DL-pyrrolidonecarboxylic acid, phytic acid, L-methionine, malic acid, L-leucine, adipic acid, ascorbic acid, L-aspartic acid, N-acetyl-L-glutamic acid, ε-aminocaproic acid, 2-amino-2-hydroxy-1,3-propanediol, γ-aminobutyric acid, alanine, L-arginine, edetic acid, lysine chloride, L-oxyproline, caprylic acid, caproic acid, citric acid, glutamic acid, gluconic acid , Glutathione and the like.

  Examples of the water-soluble organic acid salt include malonate, sodium aspartate, allantochlorohydroxyaluminum, allantoinhydroxyaluminum, L-glutamate, potassium edetate, triethanolamine edetate, disodium edetate, and edetic acid. Disodium potassium, edetate trisodium, edetate tetrasodium, sodium erythorbate, oleic acid glyceryl phosphate sodium, 5-guanylate disodium, sodium citrate, disodium citrate, glycine aluminum, calcium gluconate, L -Sodium glutamate, disodium succinate, sodium chondroitin sulfate, sodium saccharin, sodium oxalate, sodium L-tartrate, calcium lactate, lactic acid Thorium, sodium paraoxybenzoate, sodium hyaluronate, L-histidine hydrochloride, DL-sodium malate, L-magnesium phosphate phosphate, sodium phosphate-sodium phosphate, trisodium phosphate, potassium dihydrogen phosphate, phosphate Examples include sodium dihydrogen, arginine succinate, and guanidine derivatives.

  The polyhydric alcohol is not particularly limited as long as it is usually used in cosmetics and the like, but the use of a polyhydric alcohol having two or more hydroxyl groups in the molecule is low in skin irritation and smell. Is preferable in terms of weakness. Specifically, ethylene glycol, polyethylene glycol, propylene glycol, 1,3-butylene glycol, 1,4-butylene glycol, dipropylene glycol, glycerin, diglycerin, triglycerin, tetraglycerin, polyglycerin, glucose, mannitol, Examples include maltitol, sucrose, fructose, xylitol, sorbitol, maltotriose, threitol, erythritol, trehalose, polyoxyethylene methyl glucoside, and amylolytic sugar-reducing alcohol.

  Examples of the ceramides include ceramides such as ceramide 2, ceramide 3, N-acyl sphingosine, N-acyl dihydrosphingosine, N-acyl phytosphingosine, sphingomyelin, cerebroside, ganglioside, sulfatide, sphingosine, acyl sphingosine, tetra Ceramide derivatives such as acetylphytosphingosine, and ceramide analogues such as N- (hexadecyloxyhydroxypropyl) -N-hydroxyethylhexadecanamide, trihydroxypalmitamide hydroxypropyl myristyl ether, cetylhydroxyprolymphrmitamide, etc. Can be mentioned.

Examples of the collagens include collagen, collagen peptides, and atelocollagen.
Examples of the higher alcohol include lauryl alcohol, myristyl alcohol, cetyl alcohol, stearyl alcohol, cetostearyl alcohol, behenyl alcohol, oleyl alcohol, lanolin, hexyl decanol, octyldodecanol, and isostearyl alcohol.
Examples of the higher fatty acid include lauric acid, myristic acid, palmitic acid, stearic acid, behenic acid, isostearic acid, hydroxystearic acid, oleic acid, linoleic acid, and linolenic acid.

  Examples of the ester oil include olive oil, carnauba wax, lanolin, jojoba oil, glycerin monostearate, glyceryl distearate, glyceryl monooleate, diisostearate polyglyceryl, isopropyl stearate, dicaprate neopentyl glycol, and isononane. Examples thereof include isotridecyl acid, cholesteryl isostearate, N-lauroyl-L-glutamate di (cholesteryl octyldodecyl), N-lauroyl-L-glutamate di (phytosteryl · 2-octyldodecyl), and the like.

Examples of the hydrocarbons include liquid paraffin, liquid isoparaffin, petrolatum, squalane and squalene.
Examples of the silicones include dimethicone, cyclic silicone, polyether-modified silicone, polyether / alkyl-modified silicone, and amino-modified silicone.

  The humectant can be applied to the skin side of the first sheet alone or in the form of a composition containing the humectant. In addition to the humectant, such a humectant composition includes, for example, a thickener, a surfactant, an antiseptic, an antioxidant, an ultraviolet absorber, a whitening agent, a blood circulation promoter, a sebum inhibitor, an astringent, Solubilizers, other oils, medicinal ingredients such as vitamins and plant extracts, pH adjusters, chelating agents, coloring agents, fragrances, water, and the like are appropriately selected and blended within a range that does not impair the effects of the present invention, and gel Composition, emulsion, solubilized product and the like.

  In particular, it is preferable that the humectant is applied in a state of a humectant composition containing water, and the viscosity of the humectant composition at 25 ° C. is 40 Pas or more, particularly 60 Pas or more, particularly 70 Pas or more. Further, the viscosity at 25 ° C. is preferably 1200 Pas or less, particularly 500 Pas or less, and particularly preferably 300 Pas or less. For example, the humectant composition preferably has a viscosity at 25 ° C. of 40 Pas or more and 1200 Pas or less, more preferably 60 Pas or more and 500 Pas or less, and even more preferably 70 Pas or more and 300 Pas or less. A humectant composition having a viscosity in this range has appropriate fluidity and shape retention, and thus is easy to apply, but hardly penetrates into the sheet member and can be held on the sheet member with a thickness. As a result, transferability to the user's skin is improved. In order to adjust the viscosity of the humectant composition to the above range, for example, a viscosity modifier such as a thickener may be blended in the composition, and the blending amount may be set appropriately. The viscosity of the humectant composition was measured using a B-type viscometer (manufactured by Toki Sangyo Co., Ltd .: TVB-10R, 5 rpm, 1 minute) using a T bar (TC: 40 to 400 Pas, or T-) adapted to the measured viscosity. E: 200 to 2000 Pas) can be selected.

The moisturizing agent applied to the skin side surface of the first sheet preferably has a basis weight of 90 g / m ² or more in the region based on the area of the overlapping region of the heat generating part and the first sheet. 110 g / m ² or more, more preferably 130 g / m ² or more. Further, it is preferably 300 g / m ² or less, more preferably 260 g / m ² or less, and further preferably 240 g / m ² or less. By applying the humectant with a basis weight in this range, the retention of the humectant on the first sheet is improved. Moreover, it becomes difficult for the moisturizing agent to penetrate into the first sheet. Furthermore, the transferability of the moisturizer from the first sheet to the user's skin is improved. The basis weight of the moisturizing agent is a value calculated from the amount of the moisturizing agent present in the region on the basis of the area of the overlapping region between the heat generating portion and the first sheet. Hereinafter, the basis weight of the humectant means the basis weight of this definition.

  The concavo-convex sheet 9A and the raw material sheet 9B are preferably made of a synthetic resin. Examples of the synthetic resin include polyolefins such as polyethylene and polyolefin, polyesters such as polyethylene terephthalate, and polyamides such as nylon.

  As mentioned above, although this invention was demonstrated based on the preferable embodiment, this invention is not restrict | limited to the said embodiment. For example, although a plurality of heat generating parts 6 are used in the heating tool 1, only one heat generating part may be used, or three or more heat generating parts may be used depending on the specific application of the heating tool. Moreover, although the said heating tool 1 applied the heating tool to the user's face, the application site | part of a heating tool is not restricted to a face, For example, other parts of the body, for example, a shoulder, a waist, a knee, an elbow Heating tools may be applied to the arms and legs.

Moreover, in the manufacturing method of the heating tool of the present invention, the arrangement pattern of the functional agent to be applied to the skin side surface of the first sheet is not particularly limited, and also in the heating tool of the present invention, the functional agent existing portion and The functional agent can be applied in various patterns in which the functional agent non-existing portion is formed. For example, in the heating tool 1 according to the above-described embodiment, the direction in which the functional agent existence portion extends and the direction in which the concave portion of the release sheet (concave sheet) that accommodates the functional agent in the functional agent existence portion extends are the flow direction of the first sheet 4a. Although the direction is along the MD, the direction may be a direction along the direction CD perpendicular to the flow direction of the first sheet 4a, or may be greater than 0 degrees in the flow direction MD of the first sheet 4a. They may intersect at an angle of less than or equal to degrees.
In addition, in the overlapping area, a functional agent existing portion having an arbitrary shape such as a circle, an ellipse, a triangle, a square, a rectangle, a pentagon, and a star is formed in a sea island shape so as to form an island of the sea island in plan view. Also good. In addition, the functional agent existence portion can be formed in a lattice shape.

Moreover, as for uneven | corrugated sheet | seat 9A, each cross-sectional shape along direction CD orthogonal to the flow direction of the 1st sheet | seat 4a may be each shape shown to Fig.11 (a)-FIG.11 (c). In the concavo-convex sheet 9A shown in FIG. 11A, the pressure buffering convex portion 9c is not formed. The uneven sheet 9A shown in FIG. 11B has one pressure buffering protrusion 9c between adjacent recesses 9a. In the concave-convex sheet 9A shown in FIG. 11C, a concave portion 9a filled with a functional agent and a convex portion 9b sandwiching the concave portion 9a are formed on the first surface 91 side facing the first sheet 4a side. The second surface 92 opposite to the first surface 91 is a flat surface.
Further, the pressure buffering convex portions 9c may be formed continuously over the entire length of the concave portion 9a in the width direction Y of the heating device 1, or a plurality of pressure buffering convex portions 9c may be formed intermittently within the entire length of the concave portion 9a. May be.

  Moreover, in the manufacturing method of the heating tool shown in FIG. 6, although manufacture of the uneven | corrugated sheet 9A and manufacture of the heating tool using this uneven | corrugated sheet 9A were manufactured on the continuous line, the uneven | corrugated sheet | seat 9A manufactured on another line was manufactured. Alternatively, the heating tool may be manufactured by introducing it into the heating tool manufacturing line. In addition, instead of overlapping the uneven sheet 9A in the form of a belt with the first sheet 4a, the uneven sheet 9A may be cut to an arbitrary size and then stacked on the first sheet 4a. The shape of the front and rear edges may not coincide with the shape of the edge in the width direction Y of the heating tool 1 or the first sheet 4a.

Hereinafter, the present invention will be described in more detail with reference to examples. However, the scope of the present invention is not limited to such examples. Unless otherwise specified, “%” means “mass%”.
(1) Example 1
A band-shaped curing tape having a width of 8.6 mm, a thickness of 0.5 mm, and a length of 50 mm is placed on the surface of a polypropylene resin film (thickness: 0.06 mm) cut into a rectangular shape with a spacing of 1.4 mm between them. 4 were stuck in parallel to each other to obtain an uneven sheet. Then, by using a mold to grind the recesses between the curing tapes in the uneven sheet, a commercially available moisturizer (trade name: Biore Body Deli Moisture Care Pot Refresh Kao Co., Ltd.) is 1.4 mm, the same as the width of the recesses. After coating to the width, a breathable nonwoven fabric (spunlace nonwoven fabric, basis weight 70 g / m ² ) of the same shape and size as the resin film was layered so as to cover the coated moisturizing agent. Next, the concavo-convex sheet and the breathable nonwoven fabric in a state of being stacked with the moisturizer interposed therebetween were pressed through a nip roll, and then the concavo-convex sheet was peeled off, and the width of the humectant transferred to the breathable nonwoven fabric was measured. . The pressure (linear pressure) applied by the nip rolls is Pa: 13.8 g / mm, Pb: 38.8 g / mm, and Pc: 63.9 g / mm, and the width of the moisturizing agent is obtained for each case. It was.
(2) Example 2
The distance between the curing tapes was set to 1.7 mm, and the moisturizer was applied to the recesses between the curing tapes with a width of 1.7 mm, which was the same as the width of the recesses. The width of the moisturizing agent after pressing was determined.

(3) Comparative Example 1
Example 1 except that the moisturizer was applied at the same position as the position where the moisturizer was applied in Example 1 on the surface of the resin film without sticking the curing tape, with the same width as in Example 1. In the same manner as described above, the width of the moisturizing agent after being pressed by the nip roll was obtained.
(3) Comparative Example 2
Example 2 except that the moisturizer was applied at the same position as the position where the moisturizer was applied in Example 2 on the surface of the resin film without sticking the curing tape, with the same width as in Example 2. In the same manner as described above, the width of the moisturizing agent after being pressed by the nip roll was obtained.

The results of Examples 1 and 2 and Comparative Examples 1 and 2 are shown in FIG.
When the result of Example 1 shown in FIG. 12 and the result of Comparative Example 1 are paired, as in Example 1, a humectant is filled in the concave portion of the concavo-convex sheet on which the concavo-convex is formed, and transferred to the humectant, As in Comparative Example 1, it can be seen that the expansion of the width of the moisturizing agent was suppressed as compared with the case where the moisturizing agent was applied to a flat sheet and the moisturizing agent was transferred. Similarly, the same can be said from the comparison of the result of Example 2 and the result of Comparative Example 2 shown in FIG.
From this, according to the heating device manufacturing method of the present invention, in the pressurizing process during the manufacturing process, the expansion of the area of the functional agent existing part is suppressed, and the effect of heat generation or water vapor diffusion characteristics and the functional agent is suppressed. It can be seen that an excellent heating tool can be obtained. In addition, according to the heating device of the present invention, the expansion of the area of the functional agent existing part due to the manufacturing process or post-manufacture pressurization is suppressed, and the heating device is excellent in heat generation or water vapor dissipation characteristics and the effect of the functional agent. It can be seen that

DESCRIPTION OF SYMBOLS 1 Heating tool 1a Skin side surface 2 Main-body part 4a 1st sheet | seat 4b 2nd sheet | seat 5 Heating body 6 Heating part 7 Moisturizing agent (functional agent)
8a Functional agent existence part 8b Functional agent nonexistence part 9 Release sheet 9a Concave part 9b Convex part 9A Concave sheet 91 1st surface 92 2nd surface 9c Pressure buffering convex part 9d 2nd surface side convex part 9e 2nd surface side recessed part 10 Convex / concave sheet manufacturing section 12, 13 shaping roll 20 functional agent filling section 40 merging section 50 pressurizing section

Claims (9)

A breathable first sheet located on the user's body side during use, a second sheet located on the side far from the user's body, and an oxidation reaction located between the first sheet and the second sheet A functional agent that has a heat generating part that generates heat, is provided with a functional agent that can impart a specific function to the user on the side of the skin that is directed to the skin side of the user when used in the first sheet, and the functional agent is A method for producing a heating tool covered with a release sheet,
A functional agent filling step of filling the concave portion of the concave-convex sheet having the first surface on which the concave portion and the convex portion are formed with the functional agent;
On the surface to be the skin side surface in the first sheet, a merging step of overlapping the concave and convex sheets so that the skin side surface and the concave portion filled with the functional agent are opposed to each other;
Simultaneously with or after the merging step, the method for producing a heating device includes a pressing step of pressing the concavo-convex sheet from the second surface side opposite to the first surface and pressing the concavo-convex sheet against the first sheet. .   In the merging step, the concavo-convex sheet after the functional agent filling step is placed on the overlapping region between the heat generating portion and the first sheet, the concave portion filled with the functional agent and the convex portion adjacent to the concave portion. The manufacturing method of the heating tool according to claim 1, wherein the superposition is performed so that the parts are positioned.   3. The method for manufacturing a heating device according to claim 1, wherein the heat generating part is accompanied by generation of water vapor at the time of heat generation, and the first sheet has moisture permeability.   The concave portion of the concave-convex sheet extends in the flow direction of the first sheet, and the concave portion and the convex portion are alternately formed in a crossing direction orthogonal to the flow direction of the first sheet. The manufacturing method of the heating tool of any one of claim | item 1-3.   The method for manufacturing a heating tool according to any one of claims 1 to 4, wherein the uneven sheet has a height difference between the recesses and the protrusions of 0.1 mm or more and 3 mm or less.   The concavo-convex sheet has a pressure buffering convex portion on the second surface side between the concave portions adjacent to each other in the crossing direction orthogonal to the flow direction of the first sheet, and the concavo-convex sheet is the pressure buffering convex portion. The method for manufacturing a heating device according to any one of claims 1 to 5, wherein a thickness of the portion having a thickness is thicker than a thickness of the portion having the concave portion on the first surface side. The concave-convex sheet has a pressure buffering convex portion that does not overlap the concave portion on the first surface side between the concave portions adjacent to each other in the intersecting direction orthogonal to the flow direction of the first sheet on the second surface side, and the first surface A second surface side convex portion that overlaps the concave portion on the side, and has the second surface side concave portion on each side of the pressure buffering convex portion,
The length along the crossing direction of the pressure buffering convex portion is equal to or shorter than the length along the crossing direction of each of the second surface side concave portions located on both sides of the pressure buffering convex portion. The manufacturing method of the heating tool of any one of 1-6. A breathable first sheet located on the user's body side during use, a second sheet located on the side far from the user's body, and an oxidation reaction located between the first sheet and the second sheet A functional agent that has a heat generating part that generates heat, is provided with a functional agent that can impart a specific function to the user on the side of the skin that is directed to the skin side of the user when used in the first sheet, and the functional agent is A heating tool covered with a release sheet,
On the skin side surface of the first sheet in the overlapping region of the heat generating portion and the first sheet, a functional agent presenting portion where the functional agent is present and a functional agent absent portion where the functional agent is not present are formed. ,
The release sheet has a concave portion and a convex portion on the surface on the first sheet side, the functional agent of the functional agent existing portion is accommodated in the concave portion, and the convex portion faces the functional agent non-existing portion. There is a heating tool. The heating tool according to claim 8, wherein an area ratio of the functional agent existing portion in the overlapping region is 20% or more and 60% or less of an area of the overlapping region.