JP3698715B2 - Humid heat sheet - Google Patents

Description

  The present invention relates to a wet heat sheet using thermal steam generated by heat generated by an oxidation reaction between oxygen in air and an oxidizable metal. The wet heat sheet of the present invention is particularly suitably used for promoting blood circulation throughout the body by being worn on the waist and shoulders of a human body.

  Along with lifestyle changes, there is a change in the life consciousness of middle-aged and older, and the number of middle-aged and elderly, so-called active seniors, who want to maintain a high quality of daily life is increasing. Coupled with the trend of the whole society toward health toward self-medication, active seniors are becoming more popular in daily health care.

  Typical health problems common to middle-aged and older people are low back pain, shoulder pain, coldness, and blurred vision. In the middle-aged and older generations centering on the above-mentioned active seniors, it is expected that it will become common to alleviate or treat or prevent these symptoms in daily family life. For example, in order to relieve back pain etc., thermotherapy is known that heats the area by attaching a heating element containing an oxidizable metal to the waist, etc., but such thermotherapy is increasingly popular at the individual level It is expected to be.

  Regarding the heating element that can be used for the thermotherapy, the present applicant has previously proposed a thin heating sheet (see Patent Document 1). This heat generating sheet is characterized in that it has excellent heat generation characteristics as a heating element despite its extremely small thickness, and is excellent in thickness uniformity and productivity. However, in the future era when the number of middle-aged and older people will increase further, there is an increasing demand for a fever sheet that is more effective in thermotherapy.

JP 2003-102761 A

  Accordingly, an object of the present invention is to provide a wet heat sheet in which the effect of thermotherapy is higher.

The present invention comprises a molded sheet containing an oxidizable metal, a reaction accelerator and a fibrous material, containing an aqueous electrolyte solution and capable of generating heat by contact with air, and at least partly breathable. A wet heat sheet from which the heat steam is discharged to the outside through the housing body.
The molded sheet includes 60 to 90% by weight of an oxidizable metal, 5 to 25% by weight of a reaction accelerator, and 5 to 35% by weight of a fibrous material,
40 to 80 parts by weight of the aqueous electrolyte solution containing 1 to 15% by weight of electrolyte is added to 100 parts by weight of the molded sheet.
The container is air permeable on one side and moisture permeable on the other side so that thermal steam is released from the one side that is air permeable,
The above object is achieved by providing a wet heat sheet in which the moisture permeability (JIS Z0208, 40 ° C., 90% RH) of the air-permeable portion of the container is 300 to 2000 g / m ² · 24 hr. is there.
The present invention also provides a heat-generating sheet that contains an aqueous electrolyte solution in a molded sheet containing an oxidizable metal, a reaction accelerator, and a fibrous material, and that can generate heat upon contact with air, and at least a part of A wet heat sheet in which the thermal steam is discharged to the outside through the housing body.
The molded sheet includes 60 to 90% by weight of an oxidizable metal, 5 to 25% by weight of a reaction accelerator, and 5 to 35% by weight of a fibrous material,
40 to 80 parts by weight of the aqueous electrolyte solution containing 1 to 15% by weight of electrolyte is added to 100 parts by weight of the molded sheet.
A number of holes and / or cuts are made in the heating sheet,
A moisture heat sheet in which the moisture permeability (JIS Z0208, 40 ° C., 90% RH) of the breathable portion of the container is 300 to 2000 g / m ² · 24 hr is provided.

  When the wet heat sheet of the present invention is attached to the human body, not only the surface temperature of the application site but also the deep temperature of the human body can be increased. As a result, the blood flow throughout the body increases and the temperature at the application site increases, as well as the peripheral temperature of the fingertips and the like. In addition, there is an effect of keeping the peripheral temperature warm. Therefore, the wet heat sheet of the present invention has effects such as blood circulation promotion, muscle fatigue, muscle stiffness and muscle pain relief, coldness relief, and neuralgia relief. Furthermore, the wet heat sheet of the present invention is soft and fits the application site of the body, and does not feel uncomfortable.

  The deep part temperature is considered to be a temperature corresponding to a tissue temperature having a depth of 10 mm from the epidermis. When the rise in the deep part temperature is 0.2 ° C. or less, the surface temperature rise of the fingertip is not remarkably confirmed, whereas when the rise in the deep part temperature is 0.3 ° C. or more, the rise or maintenance of the fingertip surface temperature is confirmed. . In addition, regarding the warming of the fingertips and the warming of the whole body, an increase in the deep temperature is not realized at 0.2 ° C. or less, but is noticeable when the increase in the deep temperature is 0.3 ° C. or more.

  The present invention will be described below based on preferred embodiments with reference to the drawings. The wet heat sheet 1 shown in FIGS. 1 and 2 has a flat rectangular shape, and includes a heat generating sheet 2 and a container 3 for storing the heat generating sheet 2. As will be described later, the heat generating sheet 2 is composed of a fiber sheet and is formed slightly smaller than the container 3. The container 3 has a flat bag shape, and a plurality of sheet materials are bonded together to form a hollow bag shape.

  In this invention, wet heat means the heat | fever given by the steam which can raise deep part temperature 0.3 degreeC or more. The steam in this temperature range is referred to as thermal steam in the present invention. Wet heat is heat accompanied by the generation of steam. The skin surface temperature refers to the temperature of the skin surface measured by a contact thermometer, for example, a thermocouple.

  The heat generating sheet 2 can generate heat by contact with air. For this purpose, the heat generating sheet 2 is in a water-containing state and contains an oxidizable metal, a reaction accelerator, a fibrous material, and an electrolyte. When the heat generating sheet 2 comes into contact with air, an oxidation reaction of the oxidizable metal occurs and heat is generated. Due to this heat, water contained in the heat generating sheet 2 becomes hot steam and is discharged to the outside through the container 3. The thermal steam is released from the moisture permeable portion of the container 3 to the outside.

  The wet heat sheet 1 is used by being attached to a human body so that a moisture permeable portion of the container 3 faces the human body. For example, it is worn on the waist and shoulders of the human body. As a result of studies by the present inventors, when the waist and shoulders are warmed by wet heat, the circulation of the whole body is promoted and the peripheral temperature rises as compared with the case where the same part is warmed with a disposable warmer with less steam generation at the same temperature. It has been found. It was also found that the temperature increase continued for several tens of minutes after the heating was stopped. When the present inventors examined this reason, it turned out that wet heat has high heat conductivity and can raise the temperature of the deep part of a human body. It is presumed that the temperature in the deep part of the human body increases, thereby stimulating the thermal center, thereby expanding blood vessels and increasing blood flow, and increasing peripheral temperature. Therefore, the wet heat sheet 1 is effective not only for improving the temperature and blood circulation of the part of the human body to which the wet heat sheet 1 is applied, but also for improving the blood circulation of the whole body, increasing the peripheral temperature of the fingertips, and improving the cooling property.

In order to make the above effects remarkable, the wet heat sheet 1 maintains the release of the heat steam at a skin surface temperature of 38 ° C. or more for 3 hours or more, preferably 5 hours or more, and the heat sheet 1 comes into contact with the air. cumulative release of heat steam after 90 minutes of the 2.2 mg / cm ² or more, preferably ^{2.2mg / cm 2 ~7.0mg / cm 2} , more preferably 2.5mg / cm ² ~7.0mg / Cm ² (hereinafter, this is referred to as “thermal steam release characteristic”).

The accumulated release amount of thermal steam in the thermal steam release characteristic is measured by the following method.
The wet heat sheet 1 is placed in a closed system having a volume of 54000 cm ³ (length 30 cm × width 50 cm × depth 36 cm) at a temperature of 20 ° C. and a humidity of 40% RH so that steam can evaporate therein to generate heat. And the humidity of the air in the said closed system is measured with a hygrometer, and the amount of steam generated after the start of heat generation is obtained. The integrated value after 90 minutes is taken as the integrated release amount.

  As described above, the heat generating sheet 2 includes an oxidizable metal, a reaction accelerator, a fibrous material, and an electrolyte, and is in a water-containing state. Specifically, the heat generating sheet 2 of the present embodiment is configured by containing an electrolyte aqueous solution in a molded sheet containing an oxidizable metal, a reaction accelerator, and a fibrous material. As a result of studies by the present inventors, among these various materials, the materials that greatly affect the thermal steam release characteristics of the wet heat sheet 1 described above are oxidizable metals, reaction accelerators, and fibrous materials contained in the molded sheet. It turned out to be. Specifically, the amount of the oxidizable metal contained in the molded sheet is 60 to 90% by weight, preferably 70 to 85% by weight, the amount of the reaction accelerator is 5 to 25% by weight, preferably 8 to 15% by weight, It is important that the amount of fibrous material is 5 to 35% by weight, preferably 8 to 20% by weight. When the amount of these materials is in the above-mentioned range, desired thermal steam characteristics and temperature duration can be expected. As will be described later, since the molded sheet is preferably obtained by papermaking, it contains 5% by weight or less of moisture in the state after the drying step in the papermaking process.

  The weight ratios of the reaction accelerator and the fibrous material with respect to the oxidizable metal also affect the hot steam release characteristics of the wet heat sheet 1. Specifically, in the heat generating sheet 2, the weight 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 weight ratio of the fibrous material to the oxidizable metal is preferably 0.1 to 0.3, more preferably 0.12 to 0.29. If it is within these ranges, it is easy to improve the desired skin surface temperature to 38 ° C. or more and to obtain a desired amount of vapor generation. After opening the pillow bag containing the wet heat sheet, the target temperature is obtained. It is easy to provide an appropriate wet heat for 3 hours or more.

  Other important factors that affect the hot steam release characteristics of the wet heat sheet 1 include the concentration of the aqueous electrolyte solution and the added amount of the aqueous electrolyte solution in the heating sheet 2. Specifically, the concentration of the aqueous electrolyte solution in the heat generating sheet 2 is 1 to 15% by weight, preferably 2 to 10% by weight from the viewpoint of obtaining a desired temperature. The electrolyte aqueous solution is added in an amount of 40 to 80 parts by weight, preferably 50 to 70 parts by weight with respect to 100 parts by weight of the molded sheet. If the addition amount is less than 40 parts by weight, the desired temperature cannot be maintained and the amount of generated steam cannot be obtained. If it exceeds 80 parts by weight, the desired temperature cannot be obtained.

Another major factor affecting the hot steam release characteristics of the wet heat sheet 1 is the moisture permeability of the container 3 (JIS Z0208, 40 ° C., 90% RH, hereinafter referred to as a value measured by this method when referred to as moisture permeability). Can be mentioned. By using the heat-generating sheet 2 containing the above-mentioned components in the above-mentioned blending amounts, and using the container 3 having the moisture permeability described below, the thermal steam release characteristics of the wet-heat sheet 1 are desired. It can be. Specifically, in the present invention, the moisture permeability of the breathable portion of the container 3 is set to 300 to 2000 g / m ² · 24 hr, preferably 600 to 1000 g / m ² · 24 hr. When the moisture permeability of the portion having air permeability is less than 300 g / m ² · 24 hr, the desired vapor release amount is not achieved. If it exceeds 2000 g / m ² · 24 hr, the desired temperature duration cannot be achieved.

From the viewpoint of obtaining appropriate temperature control and a desired duration, the container 3 has an air permeability (JIS P8117, hereinafter referred to as a value measured by this method when referred to as air permeability) of 8000 to 15000 s / 100 cm. ³ , more preferably 9000 to 12000 s / 100 cm ³ .

It is preferable that a large number of holes (not shown) and / or notches (not shown) are formed in the heat generating sheet 2. Thereby, even if the heat generating sheet 1 is thin, a sufficiently high heat generation characteristic can be obtained, and a desired thermal steam discharge characteristic can be obtained. In addition, since flexibility is imparted to the heat generating sheet 2, it is possible to improve fit when the wet heat sheet 1 is applied to the waist and other parts and to realize more efficient wet heat. When many holes are formed in the heat generating sheet 2, the area of the holes is preferably 0.01 to 10 mm ² , particularly 0.1 to 8 mm ² , because sufficient heat generation characteristics can be obtained. . For the same reason, it is preferable that 0.1 to 20 holes / cm ² , particularly 1 to 15 holes / cm ^{2 are} formed in the heat generating sheet 2. Examples of the shape of the hole include a circle, a rectangle, a polygon, an ellipse, an oval, or a combination of two or more thereof. On the other hand, when the cut is formed, the length is preferably 1 to 50 mm, particularly preferably 5 to 30 mm.

  In order to make the heat generation characteristic of the heat generation sheet 2 desirable, it is also preferable to use a plurality of heat generation sheets 2 in a stacked manner. In this case, in order to prevent the positional deviation between the heat generating sheets 2 during use of the wet heat sheet 1, it is preferable to integrate the heat generating sheets 2 by embossing. Further, it is possible to prevent the positional deviation from occurring by making the above-described hole or cut in the heat generating sheet 2.

  As shown in FIGS. 1 and 2, in the wet heat sheet 1 of the present embodiment, the container 3 is formed in a flat bag shape by joining the peripheral edges of the moisture permeable film 3a and the hardly moisture permeable film 3b to each other. ing. That is, one side of the container 3 has the moisture-permeable film 3a, and the other side has the hardly moisture-permeable film 3b. The moisture permeable film 3a allows the thermal steam generated from the heat generating sheet 2 to pass through. However, the hardly moisture-permeable film 3b is difficult to pass through hot steam. That is, the thermal steam is discharged to the outside only from one side of the container 3, that is, the moisture permeable film 3 a side. The moisture permeability and air permeability of the moisture permeable film 3a are in the ranges described above. As a result, the wet heat sheet 1 has the desired thermal steam release characteristics as described above.

  As the moisture permeable film 3a, a film that allows thermal steam to pass therethrough but hardly allows water to pass therethrough is used. Examples of such a film include a polyolefin film having fine pores. Such a film is well known as a moisture-permeable back sheet in sanitary products such as disposable diapers and sanitary napkins. As described above, since the heat steam is released to the outside through the moisture permeable film 3a, the moisture heat sheet 1 of this embodiment is mounted so that the moisture permeable film 3a side faces the human body. Therefore, from the viewpoint of enhancing the feeling of wearing, as shown in FIGS. 1 and 2, a non-woven fabric 3c, which is a sheet material having a good texture, is disposed on the outer surface of the moisture-permeable film 3a. Therefore, the nonwoven fabric 3c faces the body when the wet heat sheet 1 is used.

  On the other hand, as the hardly moisture permeable film 3b, a film that hardly allows the passage of both hot steam and water, for example, a polyolefin film or a polyester film that does not have micropores is used. As shown in FIG. 2, an adhesive layer 4 for fixing the wet heat sheet 1 to a belt-like fitter (see FIG. 3) to be described later is formed on the outer surface of the moisture-impermeable film 3b. The pressure-sensitive adhesive layer 4 is protected by a protective release paper (not shown) until the wet heat sheet 1 is used.

  The details of each material included in the heat generating sheet 2 will be described. 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 weight or more.

  As the reaction accelerator, it is preferable to use a reaction accelerator that functions as a water retention agent and also has a function as an oxygen retention / supply agent for the oxidizable metal. 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 weight or more of 0.1 to 200 μm.

  As the fibrous material, a natural or synthetic fibrous material can be used without any particular limitation. Examples of natural fibrous materials 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. Moreover, synthetic polymer fibers such as polyester such as nylon, aramid, polyvinyl alcohol, polyvinyl chloride, polyvinylidene chloride, and polyethylene terephthalate, polyacrylonitrile, acrylic, polyethylene, polyethylene, polypropylene, polystyrene, and polyurethane can be used. 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, and polyester are preferably used from the viewpoints of fixability with an oxidizable metal and a reaction accelerator, flexibility of the heat generating sheet 2, oxygen permeability, production cost, and the like. The fibrous material preferably has an average fiber length of 0.1 to 50 mm, particularly 0.2 to 20 mm, from the viewpoint of securing the strength of the heat generating sheet 2 and the water dispersibility of the fibrous material.

  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 fixing property between the fibrous material and the oxidizable metal becomes good, and the heat generating property of the heat generating sheet 2 can be made good. Moreover, it becomes easy to adjust the tearing length described later within a range described later, and as a result, the oxidizable metal can be removed from the heat generating sheet 2 and the mechanical strength of the heat generating sheet 2 can be appropriately maintained. 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. Thus, a heat-generating sheet having a uniform thickness is easily obtained. Furthermore, molding defects such as blister breakage during drying are less likely to occur. On the other hand, in the heat generating sheet 2, since the ratio of components other than the fibrous material is relatively high, the heat generating sheet 2 having good drainage and uniform thickness can be obtained. 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.

  Examples of the electrolyte include alkali metal, alkaline earth metal or transition metal sulfates, carbonates, chlorides or hydroxides. 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 sheet 2. FIG. As described above, the exothermic sheet is formed by adding an aqueous electrolyte solution to a molded sheet containing an oxidizable metal, a reaction accelerator, and a fibrous material. Therefore, first, an oxidizable metal, a reaction accelerator. And a heat generating sheet is obtained by forming the shaping | molding sheet containing a fibrous material, and adding electrolyte aqueous solution to this shaping | molding sheet. For the production of the molded sheet, for example, a wet papermaking method described in Japanese Patent Application Laid-Open No. 2003-102761 or an extrusion method using a die coater according to the previous application of the present applicant 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 weight, particularly 0.1 to 2% by weight. Is preferred.

  From the point which maintains the form after papermaking, and the point which maintains mechanical strength, the molded sheet obtained by papermaking has a moisture content (weight moisture content, the same shall apply hereinafter) until 70% or less, particularly 60% or less. 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 90% by weight of the oxidizable metal, more preferably 70 to 85% by weight, and a reaction accelerator. 5 to 25% by weight, more preferably 8 to 15% by weight, and 5 to 35% by weight, more preferably 8 to 20% by weight of fibrous material.

The molded sheet thus obtained (that is, the exothermic sheet 2 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 because the molded sheet becomes flexible while maintaining the desired strength, and the wet heat sheet 1 can be 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 molded sheets may be used by overlapping a plurality of sheets as they are, or may be used by stacking a plurality of molded sheets folded and folded. The weight ratio of the molded sheet to the area of the wet heat sheet 1 is preferably 0.03 g / cm ^{2 to} 0.17 g from the viewpoint that the desired temperature sustain can be achieved, the fit is good, and manufacturing problems are not likely to occur. / cm ^2, more preferably from ^{0.06g / cm 2 ~0.14g / cm 2} . For the same reason, the ratio of the weight of the oxidizable metal per unit area is preferably 0.02 g / cm ² to 0.14 g / cm ² , more preferably 0.04 g / cm ² to 0.12 g / cm ^2. cm ² .

  The molded sheet has a breaking length (JIS P8113, hereinafter referred to as a value measured by this method when referred to as the breaking length) of 200 to 4000 m, particularly 200 to 3000 m, when the wet heat sheet 1 is used. This is preferable from the viewpoint of preventing the oxidizable metal from falling off the sheet and maintaining the flexibility of the molded sheet. A molded sheet having such a tearing length can be easily obtained by using the fibrous material having the CSF described above.

  The molded sheet thus obtained contains an aqueous electrolyte solution to obtain a heat generating sheet 2. 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 resulting heat generating sheet 2 are in the ranges described above.

The obtained heat generating sheet 2 is housed in the housing 3 to form the wet heat sheet 1. It is preferable that the wet heat sheet 1 is sealed in a packaging bag made of an oxygen-barrier material to form a wet bag with a wet heat sheet as the final product. When the wet heat sheet 1 is used, by removing the wet heat sheet 1 from the packaging bag, the oxidizable metal contained in the wet heat sheet 1 reacts with oxygen in the air, and heat generation starts and steam is generated. As an oxygen barrier material, for example, its oxygen permeability coefficient (ASTM D3985) is 10 cm ³ · mm / (m ² · d · MPa) or less, particularly 2 cm ³ · mm / (m ² · d · MPa) or less. Such a thing is preferable. Specific examples include ethylene-vinyl alcohol copolymer and polyacrylonitrile.

  Another embodiment of the molded sheet includes one containing an oxidizable metal, a reaction accelerator, a fibrous material, and an electrolyte. When using the molded sheet of this embodiment, water is contained in the molded sheet to form a heat generating sheet. In this case, the molded sheet is 50 to 85% by weight, preferably 65 to 80% by weight of oxidizable metal, 4.5 to 25% by weight, preferably 7.0 to 15% by weight of a reaction accelerator. 5 to 35% by weight, preferably 9 to 20% by weight of fibrous material, 0.004 to 11% by weight, preferably 0.005 to 7% by weight of electrolyte. Moreover, 30-80 weight% of water is added to a heat generating sheet with respect to 100 weight part of molded sheets, Preferably 40-70 weight% is added.

  Still another embodiment of the molded sheet includes one containing an oxidizable metal, a reaction accelerator, a fibrous material, and water. When the molded sheet of this embodiment is used, an electrolyte is contained in the molded sheet to form a heat generating sheet. In this case, the molded sheet comprises 30 to 65% by weight, preferably 40 to 55% by weight of oxidizable metal, 2.5 to 20% by weight, preferably 4.0 to 10% by weight of a reaction accelerator. 5-30% by weight, preferably 5.0-15% by weight of fibrous material, 25-45% by weight, preferably 30-40% by weight of water. Moreover, 0.2 to 10 weight% of electrolyte is added to a heat generating sheet with respect to 100 weight part of shaping | molding sheets, Preferably 0.5 to 5 weight% is added.

  As described above, the wet heat sheet 1 of the present embodiment is used while being worn on the waist or shoulders of a human body, thereby improving blood circulation of the entire body or increasing peripheral temperatures of fingertips and the like. An example of the usage pattern of the wet heat sheet 1 is shown in FIG. The wet heat sheet 1 is used by being fixed to a belt-like fitter 5 for body wearing. The center of the fitter 5 is wide, and is slightly narrower toward each tip. One end portion is provided with a fastening portion such as a hook-and-loop fastener. The fastening part is fastened to the other tip part. The fitter 5 is formed of a stretchable material in consideration of fit to the user's body.

  When using the wet heat sheet 1, first, the release paper (not shown) attached to the outer surface of the container 3 on the side of the moisture-impermeable film is peeled off to expose the adhesive layer 4. Adhere to the center of the inner surface of the fitter 5. Thus, the moisture permeable film side, that is, the side having air permeability is directed outward. Then, as shown in FIG. 4, the fitter 5 is wound around the waist so that the wet heat sheet 1 directly contacts the waist of the user. Both ends of the fitter 5 are overlapped on the user's abdomen, and a fastener attached to one tip is fastened to the other tip to fix the fitter 5. Since the contact surface to the user in the wet heat sheet 1 is composed of the nonwoven fabric 3c (see FIG. 2) which is a sheet material having a good texture, the user will not feel uncomfortable during wearing. Thus, a desired effect is exhibited by giving a user heat steam for a predetermined time (for example, about 3 to 5 hours).

  The present invention is not limited to the embodiment. For example, the wet heat sheet of the above embodiment is preferably used by being attached to the lumbar region or shoulder of the human body from the viewpoint of an increase in deep temperature, but other parts of the human body such as the neck, shoulder, back, abdomen, elbow It may be applied to a knee or the like. Furthermore, the present invention may be applied to skin care applications such as facial and body washing, sterilization, and makeup removal. In addition to being worn on the human body, combined with various functional agents such as cleaning / sterilization, sustained release of wax, fragrance, and deodorization, flooring, folding, around the range, house care applications such as ventilation fans, washing of cars, etc. It can also be applied to car care applications such as.

  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.

[Example 1]
<Slurry blending>
・ Oxidizable metal: Iron powder, manufactured by Dowa Iron Mining Co., Ltd., trade name “RKH”, 160 g
-Fibrous material: Pulp fiber (NBKP, manufactured by Skeena Co., Ltd., trade name “Skeena”, average fiber length = 2.1 mm), 20 g
・ Reaction accelerator: activated carbon, manufactured by Takeda Pharmaceutical Co., Ltd., trade name “Carborafyn”), 20 g
Flocculant: Sodium carboxymethyl cellulose (Daiichi Kogyo Seiyaku Co., Ltd., trade name “Serogen” WS-C) 0.5 g, and polyamide epichlorohydrin resin (manufactured by Nippon PMC Co., Ltd., trade name “WS547”) 0.5g
・ Water: Industrial water, 99800g

<Paper making conditions>
Using the slurry, paper was made at a line speed of 7 m / min by a slanted short net small paper machine (owned by Kochi Prefectural Paper Industry Technology Center) to produce a wet shaped sheet.

<Dehydration and drying conditions>
It was sandwiched with felt and dehydrated under pressure, passed through a heating roll at 120 ° C. at a line speed of 7 m / min, and dried until the water content became 5% by weight or less to obtain a molded sheet. The basis weight of the molded sheet was 180 g / m ² . Table 1 shows the thickness of the molded sheet.

<Electrolytic aqueous solution addition conditions>
After superposing four of the obtained molded sheets, the following electrolyte aqueous solution was spray coated and impregnated to prepare a heat generating sheet having a moisture content of 39%. Table 1 shows the blending ratio of each component in the heat generating sheet.

<Electrolyte>
Electrolyte: Purified salt (NaCl)
Water: Industrial water Electrolyte concentration: 5% by weight

<Containment in container>
1 and FIG. 1 using a moisture-permeable film made of polyethylene containing calcium carbonate (moisture permeability of 800 g / m ² · 24 hr, air permeability of 10000 s / 100 cm ³ ), a low moisture-permeable film made of linear low density polyethylene, and an air-through nonwoven fabric. The bag-shaped container shown in 2 was produced. The hydrous heat generating sheet was accommodated in this, and the wet heat sheet shown in FIG.1 and FIG.2 was obtained.

[Examples 2-7 and Comparative Examples 1-4]
A wet heat sheet was obtained in the same manner as in Example 1 except that the blending ratio of each component in the exothermic sheet was changed to the values shown in Table 1. For Comparative Example 4, a wet heat sheet was prepared with the following slurry formulation.
・ Oxidizable metal: Iron powder, manufactured by Dowa Iron Mining Co., Ltd., trade name “RKH”, 96 g
-Fibrous material: Pulp fiber (NBKP, manufactured by Skeena Co., Ltd., trade name “Skeena”, average fiber length = 2.1 mm), 12 g
-Reaction accelerator: activated carbon, manufactured by Takeda Pharmaceutical Co., Ltd., trade name “Carborafine”), 12 g
Flocculant: Sodium carboxymethyl cellulose (Daiichi Kogyo Seiyaku Co., Ltd., trade name “Serogen” WS-C) 0.5 g, and polyamide epichlorohydrin resin (manufactured by Nippon PMC Co., Ltd., trade name “WS547”) ) 0.3g
・ Water: Industrial water, 99800g

[Examples 8 to 11]
A wet heat sheet was obtained in the same manner as in Example 1 except that the molded sheet obtained in Example 1 was subjected to the drilling process or cutting process shown in Table 3.

[Performance evaluation]
About the wet heat sheets obtained in Examples 1 to 7 and Comparative Examples 1 to 4, the maximum temperature of the heat steam, the discharge duration of the heat steam of 40 ° C., and the temperature of the heat steam after 90 minutes from contact with air The cumulative release amount was measured. The maximum temperature reached here was measured according to JIS S4100. The maximum temperature is a value measured at the highest point measured by the JIS method. At low temperatures where the maximum temperature is less than 38 ° C., the deep temperature does not increase and the whole body does not warm. On the other hand, if it is 60 ° C. or higher, it is too hot to be used. Further, the wet heat sheet was attached to the fitter shown in FIG. 3 and attached to the panel, and the deep part temperature of the waist was measured by the following method. Furthermore, the whole body warming ratio was calculated | required with the following method. These results are shown in Table 2. About the wet heat sheet obtained in Examples 8 to 11, the maximum temperature of the hot steam, the release time of the hot steam of 40 ° C. were measured, and the fit when the wet heat sheet was applied to the site shown in Table 3 Feeling and wet heat feeling were evaluated. The results are shown in Table 3.

(Deep temperature measurement)
Under an environment of 20 ° C. and 40% RH, a deep thermometer (core temp CM-210, deep temperature) near the waist (the upper part of the wet heat sheet application site) where the wet heat sheet obtained in the examples and comparative examples is mounted. Probe PD1, manufactured by Terumo Corporation) was attached. A deep thermometer was attached in advance before attaching the wet heat sheet, and after confirming that the deep temperature became stable, the wet heat sheet was applied for 60 minutes to measure the deep temperature. The deep temperature measured using the deep temperature probe PD1 is considered to be a temperature corresponding to a tissue temperature 10 mm deep from the epidermis. The deep temperature before application of the wet heat sheet was defined as A, the maximum deep temperature during measurement was defined as B, and BA was defined as the deep temperature rise.

[Whole body warming ratio]
In an environment of 20 ° C. and 40% RH, a wet heat sheet was applied to 10 subjects for 60 minutes, and the actual feeling that the whole body was warmed during the application was heard by “warming and not warming”, and the ratio was determined.

  As is clear from the results shown in Table 2, it can be seen that the wet heat sheet of each example has a maximum temperature of 40 ° C. or higher, and a 40 ° C. wet heat steam release duration is as long as 3 hours or longer. On the other hand, Comparative Examples 1 to 4 have a short duration, a low integrated amount of heat steam, and a deep temperature does not improve. Moreover, although the reference example 1 which provides a commercially available disposable warmer instead of wet heat is high in temperature, the amount of steam is small and the deep temperature is not improved. As is apparent from this comparison, it can be seen that the wet heat sheet of each example is effective in increasing the temperature of the deep part of the body.

As shown in Table 3, the wet heat sheet that has been subjected to drilling or cutting has better temperature characteristics (maximum temperature reached, duration), and even better application feeling (fitness, wet heat feeling). I understand that.

It is a partially broken perspective view which shows one Embodiment of the wet heat sheet of this invention. It is a schematic diagram which shows the cross-section of the wet heat sheet | seat shown in FIG. It is a figure which shows an example of the usage condition of the wet heat sheet | seat shown in FIG. It is a figure which shows the use condition of the wet heat sheet | seat shown in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Humid heat sheet 2 Hydrous heat generating sheet 3 Container 4 Adhesive layer 5 Belt-like fitter

Claims (13)

A molded sheet containing an oxidizable metal, a reaction accelerator and a fibrous material, and an aqueous electrolyte solution, and a heat generating sheet capable of generating heat by contact with air, and at least part of the sheet has air permeability and A wet heat sheet that contains the heat generating sheet, and through which the hot steam is discharged to the outside,
The molded sheet includes 60 to 90% by weight of an oxidizable metal, 5 to 25% by weight of a reaction accelerator, and 5 to 35% by weight of a fibrous material,
40 to 80 parts by weight of the aqueous electrolyte solution containing 1 to 15% by weight of electrolyte is added to 100 parts by weight of the molded sheet.
The container is air permeable on one side and moisture permeable on the other side so that thermal steam is released from the one side that is air permeable,
The moisture heat sheet whose moisture permeability (JIS Z0208, 40 degreeC, 90% RH) of the part which has air permeability among the said containers is 300-2000g / m < ² > * 24hr. A molded sheet containing an oxidizable metal, a reaction accelerator and a fibrous material, and an aqueous electrolyte solution, and a heat generating sheet capable of generating heat by contact with air, and at least part of the sheet has air permeability and A wet heat sheet that contains the heat generating sheet, and through which the hot steam is discharged to the outside,
The molded sheet includes 60 to 90% by weight of an oxidizable metal, 5 to 25% by weight of a reaction accelerator, and 5 to 35% by weight of a fibrous material,
40 to 80 parts by weight of the aqueous electrolyte solution containing 1 to 15% by weight of electrolyte is added to 100 parts by weight of the molded sheet.
A number of holes and / or cuts are made in the heating sheet,
The moisture permeability (JIS Z0208, 40 ° C., 90% RH) of the breathable portion of the container is 300 to 2000 g / m. ² A wet heat sheet that is 24 hours. In the molded sheet, the weight ratio of the reaction accelerator to the oxidizable metal is 0.1 to 0.3, and the weight ratio of the fibrous material to the oxidizable metal is 0.1 to 0.3. The wet heat sheet according to claim 1 or 2 . The relative area of the wet heat sheet, wet heat sheet according to any one of 3 to a ratio of the weight of the molded sheet claims 1 is ^{0.03g / cm 2 ~0.17g / cm 2} . The wet heat sheet according to any one of claims 1 to 4 , wherein a thickness of one of the molded sheets is 0.1 mm to 2 mm. The wet heat sheet according to any one of claims 1 to 5 , wherein the molded sheet is formed by papermaking. Number of holes and or notches wet heat sheet of which claim 1 is subjected to the heating sheet. A molded sheet containing an oxidizable metal, a reaction accelerator, a fibrous material, and an electrolyte, and a heat-generating sheet that can generate heat by contact with air and at least part of which has air permeability. And a heat storage sheet that stores the heat generating sheet, through which heat steam is discharged to the outside through the storage body,
The molded sheet contains 50 to 85% by weight of an oxidizable metal, 4.5 to 25% by weight of a reaction accelerator, 4.5 to 35% by weight of a fibrous material, and 0.004 to 11% by weight of an electrolyte. Including
In the heat generating sheet, 30 to 80 parts by weight of water is added to 100 parts by weight of the molded sheet,
The container is air permeable on one side and moisture permeable on the other side so that thermal steam is released from the one side that is air permeable,
The moisture heat sheet whose moisture permeability (JIS Z0208, 40 degreeC, 90% RH) of the part which has air permeability among the said containers is 300-2000g / m < ² > * 24hr. A molded sheet containing an oxidizable metal, a reaction accelerator, a fibrous material, and an electrolyte, and a heat-generating sheet that can generate heat by contact with air and at least part of which has air permeability. And a heat storage sheet that stores the heat generating sheet, through which heat steam is discharged to the outside through the storage body,
The molded sheet contains 50 to 85% by weight of an oxidizable metal, 4.5 to 25% by weight of a reaction accelerator, 4.5 to 35% by weight of a fibrous material, and 0.004 to 11% by weight of an electrolyte. Including
In the heat generating sheet, 30 to 80 parts by weight of water is added to 100 parts by weight of the molded sheet,
A number of holes and / or cuts are made in the heating sheet,
The moisture permeability (JIS Z0208, 40 ° C., 90% RH) of the breathable portion of the container is 300 to 2000 g / m. ² A wet heat sheet that is 24 hours. A molded sheet containing an oxidizable metal, a reaction accelerator, a fibrous material, and water, containing an electrolyte and capable of generating heat by contact with air, and at least part of the sheet has air permeability. And a heat storage sheet that stores the heat generating sheet, through which heat steam is discharged to the outside through the storage body,
The molded sheet includes 30 to 65 wt% oxidizable metal, 2.5 to 20 wt% reaction accelerator, 2.5 to 30 wt% fibrous material, and 25 to 45 wt% water. ,
The exothermic sheet has 0.2 to 10 parts by weight of electrolyte added to 100 parts by weight of the molded sheet,
The container is air permeable on one side and moisture permeable on the other side so that thermal steam is released from the one side that is air permeable,
The moisture heat sheet whose moisture permeability (JIS Z0208, 40 degreeC, 90% RH) of the part which has air permeability among the said containers is 300-2000g / m < ² > * 24hr. A molded sheet containing an oxidizable metal, a reaction accelerator, a fibrous material, and water, containing an electrolyte and capable of generating heat by contact with air, and at least part of the sheet has air permeability. And a heat storage sheet that stores the heat generating sheet, through which heat steam is discharged to the outside through the storage body,
The molded sheet includes 30 to 65 wt% oxidizable metal, 2.5 to 20 wt% reaction accelerator, 2.5 to 30 wt% fibrous material, and 25 to 45 wt% water. ,
The exothermic sheet has 0.2 to 10 parts by weight of electrolyte added to 100 parts by weight of the molded sheet,
A number of holes and / or cuts are made in the heating sheet,
The moisture permeability (JIS Z0208, 40 ° C., 90% RH) of the breathable portion of the container is 300 to 2000 g / m. ² A wet heat sheet that is 24 hours. A packaging bag containing a wet heat sheet, wherein the wet heat sheet according to claim 1, 2, 8 , 9 , 10 or 11 is sealed in an oxygen barrier packaging bag. The wet heat sheet according to claim 1, 2, 8 , 9 , 10 or 11 , which is used by being fixed to a body-fitting fitter so that a portion having air permeability in the container is directed outward.