JP2011110166A - Elastic heat generation body - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an elastic heat generation body which suitably follows the largely movable region of a human body, is excellently fitted to the body, especially, from the middle stage to end stage of use, and effectively shows the hyperthermic effect of the heat generation body and the efficacy. <P>SOLUTION: The elastic heat generation body has a heat generation composite body where a heat generation material is held between non-elastic porous sheets. The heat generation composite body is joined with an elastic member to be superimposed on the composite body at a point sealing part arranged within the end edge of the composite body when viewing in plane. A non-joint superimposition part of the elastic member, which is superimposed on but not joined with the heat generation composite body, is elastic and independent from the heat generation composite body. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a stretchable heating element used for imparting warm heat to a user's skin.

  As a heating element that warms the body when it is chilly, disposable warmers are often used because of its ease of handling and low cost. Examples of the heat generating agent that is a heat generation source in the disposable body warmer include those utilizing an oxidizing action such as iron powder. Specifically, it is composed of iron powder, inorganic salt, activated carbon, water, and the like, and a polymer water-absorbing agent that holds it, and the material to be mixed varies depending on the purpose of use. The shape includes a powdery or solid form.

  By the way, the effect of the warming that moderately warms the body with a heating element or the like includes not only warming but also thermal treatment such as blood circulation improvement, low back pain, shoulder pain, joint pain, and recovery from fatigue. More recently, a steam heating element has been developed that warms the affected area by applying warm steam, such as a mist sauna, which improves the above-mentioned effects and promotes the removal of moisture and waste from the skin. To do. Furthermore, the development of products using thermal treatment, fatigue recovery, and moisturizing effects is also being promoted.

  Patent Document 1 discloses a heating element in which a non-stretchable plate-shaped heating material is combined with a stretchable member. In this heating element, the non-stretchable heat generating material is intermittently disposed on one surface of the stretchable first sheet, and the heat generating material covers the heat generating material and is bonded to the first sheet. It consists of two sheets. At this time, the first sheet and the second sheet are bonded to each other at a separation portion between the heat generating materials. An adhesive layer is applied to the surface of the first sheet opposite to the second sheet. At the time of use, this adhesive layer is pasted on the user's skin. Thereby, the heat generating body as a whole has elasticity, and it is easy to maintain the close contact state of the heat generating material to the body.

JP 2006-51191 A

  When the oxidation of the exothermic agent proceeds, the exothermic body constituted thereby is cured as a whole, and its elasticity may be almost lost from the middle stage to the end stage of use. In consideration of that, the thing of the said patent document 1 is still not enough, and the heat generating body which implement | achieves still higher elasticity is calculated | required.

  In view of the above points, the present invention suitably follows a movable large body part, and particularly has good fit to the body from the middle stage to the last stage of use, effectively improving the thermal effect and efficacy of the heating element. An object is to provide a stretchable heating element to be exhibited.

  The present invention provides a stretchable heating element having a heat generating composite in which a heat generating material is interposed in a non-stretchable porous sheet, and the heat generating composite is superposed on the stretchable member to be polymerized with the composite in plan view. Bonded at the point seal part applied to the edge of the body, and the non-bonded polymerized part that is superposed but not joined to the heat generating composite of the stretchable member can be stretched independently of the heat generating composite A stretchable heating element is provided. Point seal here refers to, for example, an ultrasonic seal or heat seal that is welded and joined by applying energy from the outside, or a method in which a bonding agent such as an adhesive or hot melt is partially applied and joined And include all methods of partial bonding.

  The stretchable heating element of the present invention suitably follows a movable large body part, has a particularly good fit to the body from the middle stage to the last stage of use, and maintains the close contact state of the heating material to the body The heat effect of the heating element and its effectiveness are effectively exhibited.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a partially cutaway perspective view schematically showing a stretchable heating element as an embodiment (Embodiment 1) in the present invention from the skin surface direction. It is sectional drawing of the II-II line cross section shown in FIG. It is a top view which models and shows an example of the stretchable range of the elastic | heater heating element of Embodiment 1. FIG. It is a top view which models and shows an example of the stretchable range of the elastic | stretch heat generating body as another embodiment (Embodiment 2) in this invention. It is a top view which models and shows an example of the stretchable range of the elastic | stretch heat generating body as another embodiment (Embodiment 3) in this invention. It is a top view which models and shows an example of the stretchable range of the elastic | stretch heat generating body as another embodiment (Embodiment 4) in this invention.

Hereinafter, preferred embodiments of the present invention will be shown and described in detail with reference to the drawings.
FIG. 1 is a partially cutaway perspective view showing a stretchable heating element as an embodiment (Embodiment 1) in the present invention from the skin surface direction. FIG. 2 is a cross-sectional view taken along line II-II shown in FIG.

  The stretchable heating element 10 according to the present embodiment points to the heat generation complex 1 that is non-stretchable and has a heat source and is located on the skin surface side, and the stretchable member 2 that is stretchable and located on the non-skin face side. It is joined by the seal portion 3. In the present embodiment, the position where the point seal is applied is set to the center point in the heat generating composite 1 end edge 1t. In the present embodiment, the heat generating composite 1 and the elastic member 2 constituting the elastic heating element 10 are each square, but depending on the application, a combination of a rectangular shape, a circular shape, or any other appropriate shape is preferable.

  The heat generating composite 1 in the present embodiment includes a heat generating material 1c that is a heat generation source and is in the form of a sheet, and is sandwiched between two porous sheet materials 1a and 1b that are non-stretchable members. The four sides of the upper and lower porous sheet materials are joined at the edge seal portion T by an adhesive or thermocompression bonding. The porous sheet material is located on the side close to the wearer's skin (skin side) and is provided with breathability and moisture permeability, and on the opposite side, and is far from the wearer's skin. The non-moisture permeable breathable sheet 1b provided with only the breathability on the side (non-skin side) is used. In this embodiment, the heat generating composite body 1 joined by the elastic member 2 and the point seal portion 3 is joined only on the breathable sheet 1b side. However, the surface on which the stretchable heating element is used in the present invention is not particularly limited, and may be on the heat generating composite side or on the stretchable sheet side.

  The stretchable member 2 in the present embodiment is not particularly limited as long as it is a stretchable member. However, it is preferable that the stretchable member 2 is a relatively inexpensive and environmentally compatible material suitable for a disposable material and has high stretchability. . In consideration of this, it is preferable to use a nonwoven fabric made of fibers suitable for it. It is also preferable that the shape and size are appropriately changed according to the body part to be used.

  Although the material which comprises the heat generating material 1c in this embodiment is not specifically limited, The thing using the oxidation heat produced by the oxidation reaction of a metal to be oxidized is preferable, and the steam heat generating sheet which generates a lot of steam at the time of the oxidation reaction of the metal to be oxidized It is particularly preferable to use it. In addition to the general warming effect, the heat using steam increases the heat conductivity by increasing the water conductivity of moderately warm water, that is, steam heat, and raises not only the skin surface temperature of the application site but also the temperature of the deep part of the body. Therefore, for example, the therapeutic effect is further enhanced by applying the heating element of the present embodiment to the affected area. In addition, since the heat generating material 1c has a temperature of around 40 ° C. and high humidity, the heat retaining and moisturizing effects on the body can be obtained as in the mist sauna described above.

  The feature to be particularly emphasized in the present embodiment is that the stretchable member 2 and the heat generating composite 1 are joined only at the point seal portion 3, and conversely, the portions other than the point seal portion 3 are not joined to each other and are non-joint. It is a joined state. Therefore, the non-bonded superposed portion 2 a that is superposed but not joined to the heat generating composite 1 of the stretchable member 2 is stretchable independently of the heat generating composite 1. More specifically, the non-bonded overlapping portion 2a of the stretchable member 2 can be stretched in the surface direction of the heat generating composite 1 and outward.

In the present embodiment, the steam temperature S including the steam released from the heat generating material 1c is released when an oxidation reaction of the oxidizable metal occurs due to the contact between the heat generating material 1c and air. The steam heat S generated at this time penetrates the skin surface of the wearer due to the moisture-permeable effect of the moisture-permeable sheet 1a, and moisturizes the skin while enhancing the temperature effect. The supply air A of oxygen to be used in moist heat S, there is a supply air A ₃ from the non-skin side of the air supply A ₁ and breathable sheet 1b from the skin surface side of the moisture vapor permeable sheet 1a. Furthermore, in this embodiment, since the elastic member 2 and the exothermic composite 1 are joined only at the point seal portion 3, the gap between the breathable sheet 1b and the elastic member 2 (non-bonded polymerization portion 2a). supply A ₂ sucked from is obtained. That is, in the present embodiment, the joint portion is only the point seal portion 3 and does not hinder the inflow of outside air over a wide range other than that. For this reason, the air A can be evenly contacted with the heat generating material 1c. Rather, when there is a movement of the wearer, outside air can be taken in as if breathing, and an effective steam temperature effect can be exhibited.

  In the present embodiment, the stretchable member 2 is stretchable independently from the heat generating composite 1 in a wide area other than the point seal portion 3. Therefore, even if the heat generating material 1c is cured by oxidation from the middle stage to the last stage of use, it fits suitably on the skin surface of the user by effectively utilizing the stretchability of the stretchable member 2 other than the point seal portion 3. . As a result, there is no heat dissipation due to peeling from the skin surface or being largely separated, and further, it is possible to prevent dispersal of steam with steam temperature. Although it does not specifically limit from such a viewpoint, It is preferable that the heat generating material used for this embodiment is a vapor | steam heat generating body which emits a vapor | steam. Moreover, in this embodiment, the joint part (point seal part 3) with the elastic | stretch member 2 of the heat_generation | fever composite 1 becomes higher in bending rigidity than the area | region of the non-bonding superposition | polymerization part 2a and the other elastic member 2. FIG. In other words, in this embodiment, a wide range of low bending rigidity is secured, and high flexibility to follow the user's movement is also realized. Thereby, the above-mentioned thermal effect can be drawn out more effectively as well as good fit.

  Although the formation method of the point seal | sticker part 3 in this embodiment is not specifically limited, It is preferable to use the welding method by an ultrasonic wave from the point which can be employ | adopted without the restriction | limiting of the component and thickness of a base material. Although the magnitude | size of a point seal | sticker part is not specifically limited, 1 mm-10 mm are preferable at a circle equivalent diameter in planar view, and 1 mm-5 mm are more preferable. Further, in terms of the relationship with the area Rh in plan view of the heat generating material, the ratio (Rp / Rh) between this and the area Rp of the point seal portion 3 is preferably in the range of 0.0002 to 0.05, More preferably, it is 0.001 to 0.013. Or when included in the side edge portion 1k of the porous sheet (moisture permeable sheet, breathable sheet) as in the embodiments described later, the ratio (Rp / Rs) to the area Rs of the side edge portion is as described above. It is preferable to be within the range of the ratio. By setting it as this range, the above-described elastic stretchability, steam thermal property, and followability can be simultaneously satisfied at a very high level. About the shape and number of the point seal | sticker parts 3, it is preferable to change and use suitably according to the position of the body to be used, and the shape and magnitude | size of the elastic | heater heating element 10. FIG. Moreover, you may employ | adopt a pictogram for this point seal | sticker shape.

  FIG. 3 is a plan view showing a model in which the stretchable range of the stretchable heating element 10 as the embodiment (Embodiment 1) in the present invention is compared between before stretching (solid line) and after stretching (one-dot chain line). In the present embodiment, the stretchable heating element 10 has a left-right and vertically symmetrical shape in plan view, but here, for convenience of explanation, the upper direction is defined as “up” with the point seal portion 3 in the figure as a boundary, and the opposite direction. Is described as a line L that divides the upper and lower sides. In the present embodiment, the end edge of the heat generating complex 1 is indicated by a solid line on the outer side of the point seal portion 3 in plan view, and the end edge of the stretchable member 2 is indicated by a solid line on the outer side. . What is indicated by a broken line is an edge of the heat generating material 1c. The one-dot chain line 2c shown outside the edge of the elastic member 2 is the expansion and contraction at the breaking limit when the heating material 1c and the elastic member 2 are joined all around or over the entire surface (comparative example). This is the edge position of the sex member. The range surrounded there is the stretchable region Qc of the stretchable member 2. In the figure, the elongation at break of the stretchable member 2 is assumed to be approximately 200%.

  On the other hand, in the case where the point seal portion 3 according to the present embodiment is applied, the stretchable member 2 can be extended to the breaking limit position 2i because it is joined only at the point seal portion 3, and the embodiment is partitioned by this. This is a stretchable region Qi. It should be noted that the shape of the stretched state shown in the figure is modeled for conceptual comparison, and does not strictly have to be stretched in this form, and the present invention is limited by the figure. It is not to be interpreted as. The same applies to the following drawings.

The relationship between the stretchable area Qc of the comparative example and the stretchable area Qi of the embodiment will be described in detail. Vertically from the line L which divides the width up to the upper edge of the heat generating member 1c and t _1, it is assumed that the length of the two. The width of the upper edge of the heat generating material 1c to the upper end edge of the heat generating complex 1 and t _2, it is assumed that the length 1. The width from the upper end edge of the heat generating composite 1 to the upper end edge of the stretchable member 2 is assumed to be t ₃ , and the length is assumed to be 1. Stretching the width e _c telescoping region Qc of this time comparative example extending from the upper edge of the stretchable member 2 becomes equal to t _{3 (length} 1). On the other hand, if the width e _i to the upper edge 2i of the stretchable region Qi of the embodiment is so small that the area of the point seal portion 3 can be ignored, t ₁ (length 2) + t ₂ (length 1) + T ₃ (length 1) = (length 4). In other words, the elongation e _{c of the} comparative example is four times the elongation e _{i of the} example. Thus, according to this embodiment, the elastic force which the elastic member 2 has can be utilized very effectively. Therefore, the stretchable heating element 10 of the present embodiment can be fitted to the body with high stretchability and can be used following even a body part having a large movable region such as a knee or an elbow.

Next, with respect to the stretchable heating element as the second to fourth embodiments of the present invention, differences from the first embodiment will be mainly described with reference to FIGS.
In the stretchable heating element 20 of the second embodiment, as shown in FIG. 4, two point seal portions 3 are formed on a line M that divides the stretchable heating element 20 into left-right point symmetry. Moreover, in 1st Embodiment, the point seal | sticker part 3 is provided in the side edge part 1k extended to the outward of the heat generating material 1c with the moisture permeable sheet 1a and the air permeable sheet 1b. Other dimensions and arrangement are the same as those in the first embodiment. Further, the stretchable region Qc of the comparative example is the same as that of the first embodiment. In the present embodiment, the heat generating composite 1 is bonded to the stretchable member 2 together with the moisture permeable sheet 1a and the breathable sheet 1b at two point seal portions 3, and the first embodiment is performed by bonding at the two points. Exhibits a stronger adhesion than the form. Therefore, a high fixing force is exerted against “twisting” and “rubbing” that occur when the body is moved, and it can be used corresponding to a part with extremely high movement frequency or intense exercise.

  In addition, by installing the point seal portions 3 above and below the heat generating composite 1, vertical expansion and contraction of the stretchable member 2 at this portion is suppressed, and the stretchable region Qi has a butterfly shape that is tied up and down. . By adjusting the position of the point seal and adjusting the shape of the stretchable area in this way, there are many undulating and movable parts such as faces on the body, and in places where followability is required even for subtle movements High wearability can be realized. That is, it is possible to move freely except that the movement is stopped at two places, and the fit to a place curved in the left-right direction is very high. For example, when used for an eye mask-shaped heating device, it is possible to expand and contract without applying a point seal between the eyebrows where there are many movable areas or in the vicinity of the rice chewing. On the contrary, a thermal appliance having high followability to the movement of the face can be produced by appropriately applying point seals to portions that are not movable and do not require stretchability to stop the movement.

  In the stretchable heating element 30 of the third embodiment, as shown in FIG. 5, linear point seals 3 are provided at the four corners of the heat generating composite 1 at the side edge 1k of the moisture permeable sheet 1a and the breathable sheet 1b. Are arranged perpendicular to the diagonal line connecting the four corners. Therefore, the fitting property to the location where the central portion is curved is high. Moreover, it can arrange | position in a position with sufficient precision compared with the said 2nd Embodiment.

  In the stretchable heating element 40 of the fourth embodiment, as shown in FIG. 6, hook-shaped point seals 3 are provided at the four corners of the heat generation composite 1 at the side edge 1 k of the moisture permeable sheet 1 a and the breathable sheet 1 b. It is arranged. Therefore, the fitting property to the location where the central portion is curved is high. Moreover, it is possible to arrange with higher accuracy than in the third embodiment.

  The stretchable heating element of the present invention is not limited to the above embodiments. For example, the arrangement pattern and shape of the point seals are not limited to those shown above, but are preferably set as appropriate according to the movable part of the body. In addition, the material is not particularly limited, but may be used by joining another member or the like between the elastic member 2 and the heat generating composite 1. The porous sheet used for the exothermic composite 1 may have only a part of moisture permeability or may have moisture permeability. The stretchable heating element of the present invention is preferably used mainly for the human body to obtain a thermal effect, but may also be used for warming animals or warming up moving parts. Absent. Furthermore, as a means for attaching the stretchable heating element of the present invention to the body, it is possible to use an appropriate fixing directly on the body with a stretchable member, a sticker using an adhesive, or the like, or it may be used from above the clothes. Alternatively, other articles that do not inhibit the thermal effect may be used.

[Heat generating material]
The heat generating material 1c has a steam temperature effect, and the material is not particularly limited. However, in each of the above embodiments, as described above, the heat generating material 1c is (i) an oxidizable metal, and (ii) a reaction accelerator. , (Iii) a fibrous material, and (iv) an electrolyte and a water-containing state. Specifically, the heat generating material 1c is configured by containing an electrolyte aqueous solution in a molded sheet containing an oxidizable metal, a reaction accelerator, and a fibrous material. Among these various materials, materials that particularly affect the water vapor generation function of the heat generating material 1c described above are (i) an oxidizable metal, (ii) a reaction accelerator, and (iii) a fibrous material contained in the heat generating agent. It is. Specifically, the amount of the oxidizable metal contained in the molded sheet is preferably 60 to 90% by mass, more preferably 70 to 85% by mass, and the amount of the reaction accelerator is preferably 5 to 25% by mass, and more preferably. The amount of the fibrous material is preferably 8 to 15% by mass, more preferably 5 to 35% by mass, and further preferably 10 to 20% by mass. When the amount of these materials is in the above-mentioned range, desired water vapor generation can be expected. As will be described later, since the heat generating material 1c is preferably obtained by papermaking, it contains 5% by mass or less of moisture in the state after the drying process in the papermaking process.

  The mass ratio of the reaction accelerator and the fibrous material to the oxidizable metal also affects the water vapor generation of the heat generating material 1c. Specifically, in the heat generating material 1c, the mass ratio of the reaction accelerator to the oxidizable metal is preferably 0.1 to 0.3, and more preferably 0.11 to 0.25. The mass ratio of the fibrous material to the oxidizable metal is preferably 0.1 to 0.3, and more preferably 0.12 to 0.29. Within these ranges, it is easy to improve the desired skin surface temperature to 38 ° C. or higher and obtain a desired amount of vapor generation.

  The concentration of the aqueous electrolyte solution in the heat generating material 1c is preferably 1 to 15% by mass, more preferably 2 to 10% by mass, from the viewpoint of obtaining a desired temperature. Further, the aqueous electrolyte solution is preferably added in an amount of 30 to 80 parts by mass, more preferably 30 to 50 parts by mass with respect to 100 parts by mass of the molded sheet, and the desired vapor generation is maintained. It is preferable from the point of obtaining the amount.

  (I) Examples of the oxidizable metal include powders and fibers of iron, aluminum, zinc, manganese, magnesium, calcium, and the like. Among these, iron powder is preferably used in terms of handleability, safety, and manufacturing cost. When the oxidizable metal is a powder, the particle size is preferably 0.1 to 300 μm because the fixing property to the fibrous material and the control of the reaction are good. For the same reason, it is also preferable to use a material having a particle size of 0.1 to 150 μm containing 50% by mass or more.

  (Ii) As the reaction accelerator, it is preferable to use a reaction accelerator that has a function as an oxygen retention / supply agent for an oxidizable metal in addition to acting as a moisture retention agent. For example, activated carbon (coconut shell charcoal, charcoal powder, calendar bituminous coal, peat, lignite), carbon black, acetylene black, graphite, zeolite, perlite, vermiculite, silica and the like can be mentioned. Among these, activated carbon is preferably used because it has water retention ability, oxygen supply ability, and catalytic ability. The particle size of the reaction accelerator is preferably 0.1 to 500 μm from the viewpoint that it can effectively contact the oxidizable metal. For the same reason, it is also preferable to use a material containing 50% by mass or more of 0.1 to 200 μm.

  (Iii) As the fibrous material, a natural or synthetic fibrous material can be used without particular limitation. Examples of natural fibers include cotton, kabok, 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, rabu hemp, Plant fibers such as eggplant, igusa and straw are listed. Further, animal fibers such as wool, goat hair, mohair, cashmere, alkapa, Angola, camel, vicuuna, silk, feathers, down, feather, algin fiber, chitin fiber, and casein fiber can be mentioned. Furthermore, mineral fibers, such as asbestos, are mentioned. On the other hand, examples of the synthetic fibrous material include semi-synthetic fibers such as rayon, viscose rayon, cupra, viscose rayon, cupra, acetate, triacetate, oxide acetate, promix, chlorinated rubber, and hydrochloric acid rubber. In addition, synthetic polymer fibers such as nylon, aramid, polyvinyl alcohol, polyvinyl chloride, polyvinylidene chloride, polyester such as polyethylene terephthalate, polyacrylonitrile, acrylic, polyethylene, polyethylene, polypropylene, polystyrene, polyurethane and the like can be mentioned. Furthermore, metal fiber, carbon fiber, glass fiber, etc. can also be used. Moreover, the collection | recovery reuse goods of these fibers can also be used. Among these, wood pulp, cotton, polyethylene fiber, and polyester fiber are preferably used from the viewpoints of fixability with an oxidizable metal and a reaction accelerator, oxygen permeability, production cost, and the like.

  In particular, when natural fibers such as wood pulp are used in combination with synthetic fibers such as polyethylene fibers and polyester fibers (especially thermoplastic resin fibers), the mechanical strength of the molded sheet can be increased even if the amount of oxidizable metal is increased. Is preferable because it is possible to prevent a decrease in the thickness. In this case, the blend ratio of the natural fiber and the synthetic fiber is preferably 0.1 to 20 parts by mass, and particularly preferably 0.5 to 10 parts by mass with respect to 100 parts by mass of the natural fiber. Whether the fiber is a natural fiber or a synthetic fiber, the fibrous material has an average fiber length of 0.1 to 50 mm, particularly 0.2 to 20 mm, which ensures the strength of the heating material 1c and the fibrous material. It is preferable from the viewpoint of water dispersibility.

  The fibrous material preferably has a CSF (Canadian standard drainage test method JIS P8121) of 600 ml or less, more preferably 450 ml or less. Thereby, the fixability between the fibrous material and the oxidizable metal becomes good, and the heat generation property of the heat generating material 1c can be made good. Moreover, it becomes easy to adjust the tearing length which will be described later within a range which will be described later, and as a result, it is possible to appropriately remove the oxidizable metal from the heating material 1c and to maintain the mechanical strength of the heating material 1c. it can. The lower the CSF of the fibrous material, the better. When only normal pulp fibers are used as the fibrous material, and papermaking is performed under a condition where the component ratio other than the fibrous material is high, the drainage is good and the dehydration is good by setting the CSF to 100 ml or more. It becomes easy to obtain the heat generating material 1c having a uniform thickness. Furthermore, molding defects such as blister breakage during drying are less likely to occur. In the heat generating material 1c, since the ratio of components other than the fibrous material is relatively high, it is possible to obtain the heat generating material 1c having good drainage and uniform thickness. Moreover, since the fibril increases as the CSF decreases, the fixability between the fibrous material and components other than the fibrous material is improved, and a high sheet strength can be obtained. Adjustment of the CSF of the fibrous material can be performed by a beating process or the like. CSF may be adjusted by mixing low and high CSF fibers.

  (Iv) Examples of the electrolyte include alkali metal, alkaline earth metal, or transition metal sulfate, carbonate, chloride, or hydroxide. Among these, chlorides of alkali metals, alkaline earth metals or transition metals are preferably used from the viewpoint of excellent conductivity, chemical stability and production cost, and particularly sodium chloride, potassium chloride, calcium chloride, magnesium chloride, chloride. Ferrous and ferric chloride are preferably used.

  Additives usually used in papermaking, such as a flocculant, a sizing agent, a colorant, a paper strength enhancer, a yield improver, a filler, a thickener, a pH control agent, a bulking agent, etc. A thing can also be added without a restriction | limiting in particular.

  There is no restriction | limiting in particular in the manufacturing method of the heat generating material 1c. As described above, the heat generating material 1c is formed by adding an aqueous electrolyte solution to a molded sheet containing an oxidizable metal, a reaction accelerator, and a fibrous material. A heating sheet 1c is obtained by forming a molded sheet containing an agent and a fibrous material and adding an aqueous electrolyte solution to the molded sheet. For the production of the molded sheet, a wet papermaking method or an extrusion method using a die coater can be used. In particular, it is preferable to use a wet papermaking method from the viewpoint of manufacturing cost and productivity. When performing the wet papermaking method, a circular paper machine, a long paper machine, a short paper machine, a twin wire paper machine, or the like can be used. The slurry used for papermaking contains an oxidizable metal, a reaction accelerator, a fibrous material, and water, and its concentration is 0.05 to 10% by mass, particularly 0.1 to 2% by mass. Is preferred.

  The molded sheet obtained by papermaking has a moisture content (mass moisture content, the same shall apply hereinafter) of 70% or less, particularly 60% or less from the viewpoint of maintaining the form after papermaking and maintaining the mechanical strength. It is preferable to dehydrate. Examples of the method for dewatering the formed sheet after papermaking include dewatering by suction, a method of dehydrating by blowing pressurized air, a method of dehydrating by pressing with a pressure roll or a pressure plate, and the like.

  The dehydrated molded sheet is preferably dried by heat drying. The heating and drying temperature is preferably 60 to 300 ° C, particularly 80 to 250 ° C. The moisture content of the molded sheet after drying is more preferably 20% or less, particularly 10% or less. The dehydration and / or drying of the molded sheet is preferably performed in an inert gas atmosphere from the viewpoint of suppressing oxidation of the oxidizable metal. However, since the molded sheet does not contain an electrolyte serving as an oxidation aid, it can be molded in a normal air atmosphere as necessary. This is advantageous because the production equipment can be simplified. The molded sheet after drying contains an oxidizable metal, a reaction accelerator and a fibrous material, preferably 60 to 85% by mass, more preferably 70 to 80% by mass of the oxidizable metal, and a reaction accelerator. 5 to 25% by mass, more preferably 8 to 15% by mass, and 5 to 35% by mass, more preferably 10 to 20% by mass of fibrous material.

The molded sheet thus obtained (that is, the heat-generating material 1c in a state before being hydrated) has a thickness of 0.1 mm to 2 mm, particularly 0.15 to 1.5 mm. It is preferable in that the molded sheet becomes flexible while maintaining the desired strength, and the heat generating composite 1 is easily fitted to the application site of the body. Molded sheet for the same reason, it is preferable that the basis weight of 10 to 1000 g / m ^2, more preferably from 50~600g / m ^2, and still more preferably from 100 to 500 g / m ^2. The heat generating material 1c can be obtained by containing the electrolyte aqueous solution in the above-described molded sheet. This step is preferably performed in an inert gas atmosphere such as nitrogen or argon. Examples of the method for containing the aqueous electrolyte solution include a spray coating method, a method of applying with a brush, a method of immersing in an aqueous electrolyte solution, a gravure coating method, a reverse coating method, a doctor blade method and the like. The concentration of the electrolyte in the aqueous electrolyte solution and the applied amount of the aqueous electrolyte solution are adjusted so that the amount of the electrolyte and the water content in the obtained heat generating material 1c are in the above-described ranges.

[Breathable sheet]
The moisture permeability of the moisture permeable sheet 1a (JIS Z0208, 40 ° C., 90% RH, hereinafter referred to as a moisture permeability is a value measured by this method). By using the heat-generating material 1c containing the above-described components in the above-mentioned blending amounts, and using the moisture-permeable sheet 1a having the moisture permeability described below, the heat-generating material 1c generates water vapor as desired. can do. In particular, among the moisture vapor permeable sheet 1a, Toru a preferably moisture 300~2000g / m ² · 24hr portion having a breathable, more preferably be 600~1000g / m ² · 24hr, the desired It is preferable from the viewpoint that the amount of vapor discharge can be achieved and the desired duration of temperature can be achieved.

  As the moisture permeable sheet 1a, a film member that allows the thermal steam to pass therethrough but hardly allows water to pass therethrough is used. Examples of such a film member include a polyolefin film having fine pores. In addition, since water vapor | steam is discharge | released outside through the moisture-permeable sheet 1a as mentioned above, the exothermic composite 1 of this embodiment is mounted | worn so that the side of the moisture-permeable sheet 1a may oppose a human body. As the air-permeable sheet 1b, a film member that hardly allows water vapor and water to pass therethrough, for example, a polyolefin film or a polyester film having finer pores than the moisture-permeable film is used.

[Elastic member]
Examples of the elastic member include an elastic nonwoven fabric. For example, there is a member in which the same or different substantially non-elastic non-elastic fiber layers are laminated on both surfaces of the elastic fiber layer. At this time, it is preferable that the elastic fiber layer and the non-elastic fiber layer are bonded to the entire surface by thermal fusion of the fiber intersections in a state where the constituent fibers of the elastic fiber layer maintain the fiber form. In this embodiment, at the interface between the elastic fiber layer and the non-elastic fiber layer and in the vicinity thereof, the intersection of the constituent fiber of the elastic fiber layer and the constituent fiber of the non-elastic fiber layer is heat-sealed, Therefore, it is preferable that the entire surface is uniformly bonded. Further, in at least one of the two inelastic fiber layers, a part of the constituent fibers enter the elastic fiber layer, and / or a part of the constituent fibers of the elastic fiber layer is at least one inelastic. It is preferable to be in a state of entering the fiber layer.

  As the constituent fiber of the elastic fiber layer, for example, a fiber made from a thermoplastic elastomer, rubber or the like can be used. The elastic fiber layer is an aggregate of fibers having elasticity, but inelastic fibers may be included as long as the elastic elasticity is not impaired. The inelastic fiber layer has extensibility but is substantially inelastic. The stretchability here refers to the case where the constituent fibers themselves are stretched, and even if the constituent fibers themselves are not stretched, the two fibers that have been heat-sealed at the intersection of the fibers are separated from each other, or the fibers are thermally fused. Any of the cases in which the three-dimensional structure formed by a plurality of fibers is structurally changed by wearing or the constituent fibers are torn, and the entire fiber layer is elongated. Examples of the fibers constituting the inelastic fiber layer include fibers made of polyethylene (PE), polypropylene (PP), polyester (PET or PBT), polyamide, and the like. Further, core-sheath type or side-by-side composite fibers, split fibers, irregularly shaped cross-section fibers, crimped fibers, heat-shrinkable fibers, and the like can also be used.

  The stretchable nonwoven fabric of the above embodiment has stretchability in at least one of the in-plane directions, but may have stretchability in all in-plane directions. In that case, it is not hindered that the degree of elasticity varies depending on the direction. Regarding the direction of expansion and contraction, the degree of elasticity is preferably 10 to 500 cN / 25 mm, more preferably 20 to 100 cN / 25 mm, at 50% elongation. Further, the residual strain when contracted from the 50% stretched state is preferably 15% or less, and more preferably 10% or less.

The stretchable heating element is preferably sealed in a packaging bag made of an oxygen barrier material to form a packaging bag with a stretchable heating element as the final product. When using the stretchable heating element, the oxidizable metal contained in the stretchable heating element reacts with oxygen in the air by removing the stretchable heating element from the packaging bag, and heat generation starts and water vapor is generated. To do. Examples of the oxygen barrier material include an oxygen transmission coefficient (ASTM).
D3985) is preferably 10 cm ³ · mm / (m ² · d · MPa) or less, and particularly preferably 2 cm ³ · mm / (m ² · d · MPa) or less. Specific examples include ethylene-vinyl alcohol copolymer and polyacrylonitrile.

DESCRIPTION OF SYMBOLS 1 Heat_generation | fever composite 1a Moisture-permeable sheet | seat 1b Breathable sheet | seat 1c Heat generating material 2 Stretchable member 3 Point seal part Qc Stretchable area | region Qi of a comparative example Stretchable area | region 10, 20, 30, 40 of a Example Stretchable heating element

Claims (4)

  A stretchable heating element having a heat generating composite in which a heat generating material is interposed in a non-stretchable porous sheet, wherein the heat generating composite is polymerized with the heat generating composite, and an end of the composite in plan view A non-bonded polymerized portion that is joined by a point seal portion applied inside and that is superposed on the heat generating composite of the stretchable member but that is not joined is stretchable independently of the heat generating composite. Sex heating element.   The porous sheet has a side edge portion extending outward of the heat generating material in the porous sheet, and the heat generating composite is joined to the stretchable member at a point seal portion at the side edge portion. The stretchable heating element according to claim 1, wherein the point seal portion is linear, wavy, bowl-shaped, substantially circular, polygonal or the combination in plan view.   The stretchable heating element according to claim 1 or 2, wherein the non-bonded polymerization portion of the stretchable member is stretchable in the surface direction and outward of the heat generating composite.   The stretchability according to any one of claims 1 to 3, wherein the heat generating material is a steam thermal material, and at least a part of the porous sheet has moisture permeability that allows moisture emitted from the steam thermal material to pass through. Heating element.

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