JP7551201B2 - Reaction restriction bags and clothing - Google Patents

Description

The present invention relates to a reaction limiting bag that contains a product that has been officially released onto the market and that, when used by a consumer as a heating element, suppresses the reaction of the heating element of the product, thereby extending the effective heating time of the product beyond the rated duration of the product, and to clothing fitted with this reaction limiting bag.

A typical example of a product that serves as a heating element is a disposable hand warmer. Disposable hand warmers generally use the heat generated by the oxidation of iron powder, and are "oxidation-limited heating elements" whose heat generation rate is limited by the oxidation reaction. Products on the market are widely available in which an oxidation-limited heating element, in which a heat generating composition such as iron powder is enclosed in a breathable packaging material such as nonwoven fabric or paper, is stored in a packaging bag made of an air-impermeable material. When using the product, the packaging bag is removed to expose the breathable packaging material. In the case of nonwoven fabric, depending on the fiber diameter and basis weight (mass per unit area), fine pores of several μm to several tens of μm are opened, making it breathable. Depending on the size and use, those with a rated duration of about 12 to 20 hours are mainstream. This rated duration refers to the "time to maintain and sustain a temperature of 40°C or higher," and it seems that the characteristics of the breathable packaging material are often adjusted so that the maximum temperature is 60 to 70°C and the average temperature is 50 to 60°C. Therefore, when current disposable hand warmers are used normally and the rate is limited by the characteristics of the breathable packaging material, the heat generating effect disappears after half a day to a little less than a day of use, and the warmer must be discarded.

However, for consumers who use multiple disposable hand warmers every day during the cold season, disposing of them has the disadvantage of taking time and effort, and the waste itself can be stressful. Furthermore, from an environmental perspective, an increase in waste is something that we want to avoid.

Furthermore, the temperature of a disposable hand warmer, especially the temperature immediately after starting to use it, is generally too high for human skin, so in order to use it comfortably, it is necessary to take the trouble of adjusting the temperature by placing clothing or other fabric between the hand warmer and the skin. And since the temperature of the hand warmer drops after a few hours of use, it is necessary to remove the temperature-adjusting clothing in order to continue using it comfortably. In addition, the average temperature of a disposable hand warmer is 50 to 60 degrees Celsius, which is a temperature range that can cause low-temperature burns even if the hand warmer comes into indirect contact with the human body through clothing. No matter how comfortable the user feels, keeping the disposable hand warmer in contact with the same part of the body increases the possibility of low-temperature burns. According to the Japan Burn Association, low-temperature burns are "burns that occur when a comfortable warm temperature (44 degrees Celsius to 50 degrees Celsius) is in contact with the same part of the skin for a long period of time." Thus, in order to use a disposable hand warmer safely and comfortably from the beginning to the end of use, it is dangerous and insufficient to simply keep it in contact with the same part of the skin of the body in the same way all the time.

Patent Document 1 describes a disposable hand warmer cover with an aluminum-processed film applied to a portion of it, with the aim of making disposable hand warmers last longer, more effectively, and more comfortably than their rated duration. By applying an aluminum-processed film to the surface that does not come into contact with the human body, it is said to have the effect of preventing heat dissipation from that surface, reducing the inflow of air from that surface, slowing down the chemical reaction rate of the hand warmer, and making the hand warmer last longer. However, in the device described in Patent Document 1, the material of the other surface opposite the surface is cloth, so the amount of air inflow cannot be controlled, and it is not expected to have much effect in slowing down the chemical reaction rate of the hand warmer. The cloth surface of the hand warmer cover described in Patent Document 1 comes into contact with plenty of fresh air, especially immediately after starting use, so there is a problem in that it is difficult to prevent the hand warmer from suddenly increasing in temperature.

Publicly-available Practical Application No. 58-95821

In consideration of the above problems, the present invention aims to provide a reaction limiting bag that contains an oxidation-rate-limiting heating element as a product and is set to a temperature range appropriate for the human body, thereby making the effective heat generation time longer than the rated duration of the product, and clothing equipped with this reaction limiting bag.

The first aspect of the present invention relates to a reaction restriction bag used in the form of product use to restrict the oxidation reaction of an oxidation-limiting heating element when an oxidation-limiting heating element containing oxidation-limiting heating particles in a bag of a breathable packaging material is officially released to the market as a product and used by a consumer as a heating element. The reaction restriction bag according to the first aspect is characterized in that it comprises (a) an openable inner bag that contains the oxidation-limiting heating element together with an air layer surrounding the oxidation-limiting heating element, and (b) an openable outer bag that contains the inner bag together with an air layer surrounding the inner bag. The outer bag of the reaction restriction bag according to the first aspect has a first bag shape with a first opening at the upper end, with a first front sheet and a first back sheet facing the first front sheet as main members, and has a first opening/closing device near the first opening. The inner bag of the reaction limiting bag according to the first embodiment has a second front sheet and a second back sheet facing the second front sheet as main members, is in the shape of a second bag having a second opening at the upper end, has a second opening/closing device near the second opening, and is disposed inside the outer bag. Furthermore, a plurality of oxygen supply holes are provided in each of the first and second front sheets and the first and second back sheets of the reaction limiting bag according to the first embodiment, and each of the plurality of oxygen supply holes is a through hole having an equivalent diameter of 1.6 to 3.0 mm in terms of the area of a circle.

The second aspect of the present invention relates to clothing used in the form of a product to limit the oxidation reaction of an oxidation-limiting heating element when an oxidation-limiting heating element containing oxidation-limiting heating particles in a bag of a breathable packaging material is officially released to the market as a product and used by a consumer as a heating element. The clothing according to the second aspect is characterized by comprising (a) a reaction-limiting bag having a double-bag structure consisting of an openable inner bag that contains the oxidation-limiting heating element together with an air layer surrounding the oxidation-limiting heating element, and an openable outer bag that contains the inner bag together with an air layer surrounding the inner bag, and (b) a footwear cover having a cylindrical portion that surrounds the ankle of a human body and fixes the reaction-limiting bag to the inside. The outer bag of the reaction-limiting bag constituting the clothing according to the second aspect has a first bag shape with a first opening at the upper end, with a first front sheet and a first back sheet facing the first front sheet as main members, and has a first opening/closing device near the first opening. The inner bag of the reaction limiting bag constituting the clothing according to the second embodiment has a second front sheet and a second back sheet facing the second front sheet as main members, is in the shape of a second bag having a second opening at the upper end, has a second opening/closing device near the second opening, and is placed inside the outer bag. Furthermore, a plurality of oxygen supply holes are provided in each of the first and second front sheets and the first and second back sheets of the reaction limiting bag constituting the clothing according to the second embodiment, and each of the plurality of oxygen supply holes is a through hole having an equivalent diameter of 1.6 to 3.0 mm when converted into a circle area.

The third aspect of the present invention relates to clothing used in the form of a product to limit the oxidation reaction of an oxidation-limiting heating element when an oxidation-limiting heating element containing oxidation-limiting heating particles in a bag of a breathable packaging material is officially released to the market as a product and used by a consumer as a heating element. The clothing according to the third aspect includes (a) a reaction-limiting bag having a double-bag structure consisting of an openable inner bag that contains the oxidation-limiting heating element together with an air layer surrounding the oxidation-limiting heating element, and an openable outer bag that contains the inner bag together with an air layer surrounding the inner bag, and (b) a vest having a bag-shaped back body with the reaction-limiting bag disposed inside. The outer bag of the reaction-limiting bag constituting the clothing according to the third aspect has a first bag shape with a first opening at the upper end, with a first front sheet and a first back sheet facing the first front sheet as main members, and has a first opening/closing device near the first opening. The inner bag of the reaction limiting bag constituting the clothing according to the third aspect has a second front sheet and a second back sheet facing the second front sheet as main members, is in the shape of a second bag having a second opening at the upper end, has a second opening/closing device near the second opening, and is placed inside the outer bag. Furthermore, a plurality of oxygen supply holes are provided in each of the first and second front sheets and the first and second back sheets of the reaction limiting bag constituting the clothing according to the third aspect, and each of the plurality of oxygen supply holes is a through hole having an equivalent diameter of 1.6 to 3.0 mm when converted into a circle area.

According to the present invention, it is possible to provide a reaction limiting bag that contains an oxidation-rate-limiting heating element, which is a product, and that is set to a temperature range appropriate for the human body, thereby making the effective heat generation time longer than the rated duration of the product, and clothing equipped with this reaction limiting bag.

FIG. 1 is a perspective view of a reaction restriction bag 1a according to a first embodiment of the present invention. 1 is a perspective view of a reaction limiting bag 1a according to a first embodiment of the present invention, in which an oxidation-rate-limiting heating element 100 is enclosed. FIG. FIG. 3 is a front view of FIG. 2 . 4 is a cross-sectional view taken along the line AA in FIG. 3. 5 is a cross-sectional view of the outer bag 11a in the open state from the state shown in FIG. 4. FIG. 6 is a cross-sectional view of the inner bag 21a in the open state from the state shown in FIG. 5. FIG. FIG. 11 is a perspective view of a reaction restriction bag 1b according to a first modified example of the first embodiment of the present invention. FIG. 13 is a perspective view of a reaction restriction bag 1c according to a second modified example of the first embodiment of the present invention. FIG. 11 is a perspective view of a reaction restriction bag 2 according to a second embodiment of the present invention. FIG. 11 is a perspective view of a reaction limiting bag 2 according to a second embodiment of the present invention, in which an oxidation rate-limiting heating element 100 is enclosed. FIG. 11 is a front view of FIG. 12 is a cross-sectional view taken along the line AA in FIG. 11. 13 is a cross-sectional view of the state in which the outer bag 11d and the inner bag 21d are opened from the state shown in FIG. 12. FIG. 14(a) is a first perspective view of footwear 6 according to a third embodiment of the present invention, and FIG. 14(b) is a second perspective view of footwear 6 according to the third embodiment of the present invention. FIG. 11 is a perspective view of an attachment bag 4 according to a third embodiment of the present invention. FIG. 11 is a front view of a vest 7 according to a fourth embodiment of the present invention. A front view of a vest 8 according to a modified example of the fourth embodiment of the present invention. FIG. 11 is a front view of a torso pad 9 according to another embodiment. Graph 1 according to Example 1. Graph 2 according to Example 1. Graph 3 according to Example 1. Graph 4 according to Example 1. Graph 1 according to Example 2. Graph 2 according to Example 2. Graph 3 according to Example 2. Graph 4 according to Example 2. Graph 1 according to Example 3. Graph 2 according to Example 3. Graph 3 according to Example 3. Graph 4 according to Example 3. FIG. 31(a) is a front view of the outer bag 11e, and FIG. 31(b) is a front view of the inner bag 21e. FIG. 32(a) is a front view of the outer bag 11f, and FIG. 32(b) is a front view of the inner bag 21f. FIG. 32 is an enlarged perspective view of part A in FIG. Table 2 relates to Examples 1 and 4 to 8. Graph 1 according to Example 4. Graph 2 according to Example 4. Graph 3 according to Example 4. Graph 4 according to Example 4. Graph 1 according to Example 5. Graph 2 according to Example 5. Graph 3 according to Example 5. Graph 4 according to Example 5. Graph 5 according to Example 5. Graph 1 according to Example 6. Graph 2 according to Example 6. Graph 3 according to Example 6. Graph 4 according to Example 6. Graph 1 according to Example 7. Graph 2 according to Example 7. Graph 1 according to Example 8. Graph 2 according to Example 8. Graph 3 according to Example 8.

With reference to the drawings, the embodiments, modifications, examples, etc. of the present invention will be described. In the following description of the drawings, the same or similar parts are given the same or similar symbols. However, it should be noted that the drawings are schematic, and the relationship between thickness and planar dimensions, the ratio of thickness of each layer, etc. are different from the actual ones. Therefore, the specific thickness and dimensions should be determined with reference to the following explanation. Of course, there are also parts with different dimensional relationships and ratios between the drawings. Furthermore, it should be noted that the reaction limiting bag and the members constituting the present invention are often symmetrical, and the notations such as "front" and "back" are for the convenience of explanation and do not limit the form or method of use. It should also be noted that the notations such as "top" are for the convenience of explanation of the reaction limiting bag and the members constituting the present invention, and do not limit the form or method of use.

Furthermore, the embodiments, modifications, examples, etc. of the present invention shown below are merely examples of articles and methods for embodying the technical idea of the present invention, and the technical idea of the present invention does not specify the materials, shapes, structures, arrangements, etc. of the components of the articles to those described below. The technical idea of the present invention may be modified in various ways within the technical scope defined by the claims set forth in the claims.

First Embodiment
The reaction limiting bag 1a according to the first embodiment of the present invention is a flexible portable bag including a flat outer bag 11a and a flat inner bag 21a housed in the outer bag 11a, as illustrated in FIG. 4 and the like. An oxidation-rate-limiting heating element 100, whose heat generation is rate-limiting due to an oxidation reaction, is housed in the inner bag 21a in a form of use. In general, the oxidation-rate-limiting heating element 100 as a product is typically a portable heating device known as a "disposable warmer," and products housed in a packaging bag made of an air-impermeable material are widely available on the market. When using the product, it is necessary to remove the packaging bag and expose the breathable packaging material containing the oxidation-rate-limiting heating particles that are the heat generating agent. In this specification, the form in which the packaging bag of the product is removed and the breathable packaging material is exposed is referred to as the "form of use." The double bag structure of the outer bag 11a and the inner bag 21a limits the conductance of oxygen supply to the oxidation-rate-limiting heating element 100, suppressing the oxidation reaction of the oxidation-rate-limiting heating element 100. As shown in FIG. 1, the outer bag 11a of the reaction limiting bag 1a according to the first embodiment has an opening at the upper end. As shown by hidden lines in FIG. 1, the inner bag 21a also has an opening at the upper end, similar to the outer bag 11a. As shown in FIG. 1, a plurality of oxygen supply holes 31a are provided penetrating both the front and back sides of the outer bag 11a, i.e., the front sheet of the outer bag 11a and the back sheet facing the front sheet. That is, the plurality of oxygen supply holes 31a penetrate the front sheet along the thickness direction of the front sheet. Note that the plurality of oxygen supply holes in the back sheet of the outer bag 11a are not shown, but similarly penetrate the back sheet along the thickness direction of the back sheet. Also, although not shown in the figures, multiple oxygen supply holes are provided penetrating both the front and back surfaces of the inner bag 21a, i.e., the front sheet of the inner bag 21a and the back sheet facing the front sheet, and the multiple oxygen supply holes penetrate the front sheet and back sheet of the inner bag 21a along the thickness direction of each of the front sheet and back sheet of the inner bag 21a.

For the sake of convenience, in this specification, the opening of the outer bag 11a is defined as the "first opening" and the opening of the inner bag 21a is defined as the "second opening". Similarly, the front sheet of the outer bag 11a is defined as the "first front sheet", the back sheet of the outer bag 11a as the "first back sheet", the front sheet of the inner bag 21a as the "second front sheet", and the back sheet of the inner bag 21a as the "second back sheet". In the perspective view of FIG. 1, the first and second front sheets are arranged on the front side of the page, and the first and second back sheets are arranged on the back side of the page. Similarly, in the following embodiments, modifications, examples, etc., all openings of the outer bag are referred to as the "first opening" and all openings of the inner bag are referred to as the "second opening". Similarly, in subsequent embodiments, variants, examples, etc., the front sheet of the outer bag will be referred to as the "first front sheet," the back sheet of the outer bag will be referred to as the "first back sheet," the front sheet of the inner bag will be referred to as the "second front sheet," and the back sheet of the inner bag will be referred to as the "second back sheet."

The outer bag 11a constituting the reaction restriction bag 1a according to the first embodiment has a "first bag-like" flexible structure with a first opening at the upper end and a first front sheet and a first back sheet as main members, as shown in Figs. 1 and 4. On the other hand, as shown in Figs. 1 and 4, the inner bag 21a stored in the outer bag 11a has a "second bag-like" flexible structure with a second front sheet and a second back sheet as main members and a second opening at the upper end. In Fig. 1, the first front sheet and the first back sheet are both rectangular and have the same shape, so the outer bag 11a has a flat rectangular bag shape. The first front sheet and the first back sheet have three sides other than the upper sides connected to each other among their four sides, and the upper sides are not connected to each other, functioning as the first opening. The same is true for the inner bag 21a.

As shown in FIG. 1, the first joints (15a ₁ , 15a ₂ ) are provided near the center of the upper edge of each of the first front sheet and the first back sheet. The first joints (15a ₁ , 15a ₂ ) are composed of a rectangular first front joint piece 15a ₁ connected to the first front sheet side and a rectangular first back joint piece 15a ₂ connected to the first back sheet side. In FIG. 1 and FIG. 4 to FIG. 6, the first front joint piece 15a ₁ is shown as being fixed only to the outside of the first front sheet, but the illustrations in FIG. 1 and FIG. 4 to FIG. 6 are only examples, and the first front joint piece 15a 1 may be fixed so as to sandwich the first front sheet, or may be fixed only to the inside of the first front sheet, or may be otherwise. In addition, the shape of the first front joint piece 15a ₁ is shown as a rectangular thin piece in FIG. 1 etc., but it may be any shape such as a polygon other than a rectangle, a circle, an ellipse, etc. The fixing style and shape are the same for the first back joint piece 15a ₂ . The first joints ( _15a1 , _15a2 ) are members for making it easier to change the outer bag 11a from a closed state to an open state, and may be integral with the first front sheet and the first back sheet, respectively, or may not necessarily be present on the outer bag 11a in the first place.

As shown in FIG. 1, the outer bag 11a is provided with a first opening/closing device 13a near the first opening, i.e., slightly below the upper edges of the first front sheet and the first back sheet. In FIG. 1, only the first front sheet side is shown, but the first opening/closing device 13a is provided at a similar position on the first back sheet side. In this specification, the "first opening" is defined as the portion of the outer bag 11a from the upper edges of the first front sheet and the first back sheet to the first opening/closing device 13a. When the first opening/closing device 13a is disposed on the upper edges of the first front sheet and the first back sheet, the first opening is the upper edges of the first front sheet and the first back sheet, and means the first opening/closing device 13a. This also applies to the following embodiments, modifications, examples, etc. In other words, the first opening/closing device 13a is an opening/closing device that can freely open and close the first opening. The first opening/closing device 13a can be of any type, such as a zipper or a zipper with a slider, as long as it can be opened and closed and can seal the first opening when closed. The zipper can be put into a pseudo-sealed state by fitting one convex rail (male member) and the other concave rail (female member) with fingers or the like. The zipper with slider can fit the convex rail and the concave rail by moving the slider in one direction in the horizontal direction. In either case, the fitting between the convex rail and the concave rail can be released to move from the closed state to the open state. Note that the "pseudo-sealed (semi-sealed)" state of the first opening when the first opening/closing device 13a is in the closed state only needs to be a "pseudo-sealed" state that limits the conductance of oxygen inflow and outflow when focusing on the first opening, and does not refer to the "sealing (sealing)" of the outer bag 11a itself. Since the outer bag 11a has a plurality of oxygen supply holes such as a plurality of oxygen supply holes 31a that are provided through the outer bag 11a, it is impossible for the first opening/closing device 13a to completely seal the outer bag 11a itself. This also applies to the following embodiments, modifications, examples, etc.

In this specification, the "open state" of the first opening/closing device 13a refers to a state in which a part or all of the first opening/closing device 13a is open, that is, the pseudo-sealed state of the first opening is released. On the other hand, the "closed state" of the first opening/closing device 13a refers to a state in which the entire first opening/closing device 13a is closed, that is, the first opening is in a pseudo-sealed state. In this specification, the open state of the first opening/closing device 13a may be expressed in other words as the first opening being in an open state, or the outer bag 11a being in an open state, etc., but both of these are intended to refer to the open state. The same applies to the concept of the "closed state". The concepts of the "open state" and the "closed state" are the same in the following embodiments, modified examples, examples, etc.

The number of the oxygen supply holes 31a provided in the first front sheet of the outer bag 11a shown in FIG. 1 is preferably about 50 to 100, more preferably 70 to 90, in the case of the outer bag 11a in which the width of the first front sheet is 16 cm and the height from the bottom to the first opening and closing device 13a is 19.5 cm. The shape of the oxygen supply holes 31a may be any shape, such as a polygon or a circle, but in the case of a circle, the hole preferably has a diameter of 0.1 to 3 mm, more preferably 1.6 to 3.0 mm. In the following description of this specification, a characteristic dimension such as the maximum diagonal length of a two-dimensional figure that is equal to the area of a circle with a diameter of 0.1 to 3 mm is called an "equivalent diameter Φ _eff 0.1 to 3 mm". Similarly, a characteristic dimension of a two-dimensional figure that gives an area equal to the area of a circle with a diameter of 1.6 to 3.0 mm is called an "equivalent diameter Φ _eff 1.6 to 3.0 mm". For example, in the case of a square or rectangle, the two diagonal lengths are equal, so the maximum diagonal length can be selected as the characteristic dimension, but the maximum diagonal length equal to the area of a circle with equivalent diameter Φ _eff can be selected as the characteristic dimension. In the case of a regular pentagon, the five diagonal lengths are equal, so all of the maximum diagonal lengths equal to the area of a circle with equivalent diameter Φ _eff can be selected as the characteristic dimension. In the case of a regular hexagon, three maximum diagonal lengths and six diagonal lengths shorter than the maximum diagonal length are defined, so the maximum diagonal length is selected as the characteristic dimension. In the case of a regular heptagon, eight maximum diagonal lengths and six diagonal lengths shorter than the maximum diagonal length are defined, so the maximum diagonal length is selected as the characteristic dimension. In the case of an ellipse, the equivalent diameter given by (major axis) x (minor axis) = (equivalent diameter/2) ² is selected as the characteristic dimension, and this is extended to ellipses as well.

If the equivalent diameter Φ _eff of the oxygen supply holes 31a greatly exceeds 3.0 mm, the amount of oxygen flowing in and out of the holes becomes too large. In this specification, the area from the bottom edge of the first front sheet to the height of the first opening/closing device 13a in Fig. 1 is defined as the "hole settable area", and the total area of the hole settable area is defined as the "hole settable area". Then, the hole settable area of the first front sheet is defined as A ₁ , the total area of the oxygen supply holes 31a is defined as ΣS ₁ , and the "critical open hole area ratio η ₁ of the first front sheet" is defined as:

η ₁ =ΣS ₁ /A ₁ ...(1)

It is defined as follows. Under conditions where the oxygen concentration in the air is 20.95% (near the ground surface), the critical open area ratio η ₁ of the first front sheet defined by formula (1) is preferably about 0.02 to 2.5%, and more preferably about 0.1 to 1.0%. Furthermore, the critical open area ratio η ₁ of the first front sheet is preferably 0.11 to 0.83%. The number, shape, equivalent diameter Φ _eff , critical open area ratio, etc. of _the multiple oxygen supply holes provided in the first back sheet are similar to those of the multiple oxygen supply holes 31a of the first front sheet. The definitions of the equivalent diameter Φ _eff , hole installation area, hole installation area, critical open area ratio, etc. of the first front sheet and the first back sheet are the same in other embodiments, modifications, examples, etc.

The oxygen supply holes 31a shown in FIG. 1 may be aligned at regular intervals or may not be aligned as shown in FIG. 1. However, it is better to provide the oxygen supply holes 31a evenly over the entire area where holes can be provided, rather than concentrating them in specific locations. The intervals between the oxygen supply holes 31a may be any interval as long as it is within the range of the critical open area ratio η ₁ of the first front sheet for an oxygen concentration of 20.95% defined by formula (1) = 0.02 to 2.5%. For example, in the outer bag 11a, when the width of the first front sheet is 16 cm, the height from the bottom edge to the first opening/closing device 13a is 19.5 cm, and each of the oxygen supply holes 31a has an equivalent diameter Φ _eff of 1.6 mm, it is preferable that the interval (pitch) between the oxygen supply holes 31a is about 1.5 to 3.0 cm, and the number of the oxygen supply holes 31a is about 25 to 90. The multiple oxygen supply holes provided in the first back sheet are also considered in terms of pitch and other factors in the same manner as the multiple oxygen supply holes 31a. Note that the positions of the multiple oxygen supply holes provided in the first back sheet do not need to coincide with the positions of the multiple oxygen supply holes 31a in the first front sheet.

The material of the first front sheet shown in FIG. 1 may be any material that does not transmit oxygen or moisture in the air, such as polyethylene film (PE film), polypropylene film (PP film), ethylene-vinyl acetate copolymer film (EVA film), biaxially oriented polypropylene film (OP film), PVDC resin-coated OPP film (KOP film), non-oriented polypropylene film (CP film), nylon film (NY film), biaxially oriented high gas barrier nylon film (barrier NY film), polyester film (PET film), transparent vapor deposition polyester film (transparent vapor deposition PET film), polyvinyl chloride film, etc. may be used. In addition, a laminate film obtained by laminating the above-mentioned various films, an aluminum vapor deposition film obtained by vapor-depositing aluminum on various films, etc. may be used. The thickness of the first front sheet may be any thickness, such as 0.01 to 0.1 mm. The material and thickness of the first back sheet are the same as those of the first front sheet.

The first bag-like flexible structure exhibited by the outer bag 11a shown in Figures 1 and 4 may be any of a two-sided sealed bag, a three-sided sealed bag, a side sealed bag, a bottom sealed bag, etc. As shown in Figure 1, the outer bag 11a according to the first embodiment does not have a gusset on the bottom or side, but may be a type having a gusset on the bottom or side, such as a bottom gusset bag or a side gusset bag. When the outer bag 11a has a gusset on the bottom or side, multiple oxygen supply holes may be provided in the gusset portion, similar to the multiple oxygen supply holes 31a.

As shown in Figures 1 and 4, the inner bag 21a stored inside the outer bag 11d has a second front sheet and a second back sheet as main members, has a second opening at the top end, and constitutes a reaction restriction bag according to the first embodiment of a double bag structure together with the outer bag 11d. As shown by hidden lines in Figure 1, the second front sheet and the second back sheet are both rectangular and have the same shape, so the inner bag 21a is a flat rectangular second bag. The second front sheet and the second back sheet are connected to each other at three sides other than the upper sides, and the upper sides are not connected to each other, functioning as a second opening.

As shown in FIG. 1, the second joints (25a ₁ , 25a ₂ ) are provided near the center of the upper sides of the second front sheet and the second back sheet. The second joints (25a ₁ , 25a ₂ ) are composed of a rectangular second front joint piece 25a ₁ connected to the second front sheet side and a rectangular second back joint piece 25a ₂ connected to the second back sheet side. In FIG. 1 and FIG. 4 to FIG. 6, the second front joint piece 25a ₁ is shown as being fixed only to the outside of the second front sheet, but this is only an example, and it may be fixed so as to sandwich the second front sheet, or may be fixed only to the inside of the second front sheet, or in other ways. In addition, the shape of the second front joint piece 25a ₁ is shown as a rectangular thin piece in FIG. 1 etc., but it may be any shape other than a rectangle, such as a polygon, a circle, an ellipse, etc. The same fixing style and shape apply to the second back joint piece 25a ₂ . The second joints ( _25a1 , _25a2 ) are members for making it easier to change the inner bag 21a from a closed state to an open state, and may be integral with the second front sheet and the second back sheet, respectively, or may not necessarily be present on the inner bag 21a in the first place.

As shown in FIG. 1, the inner bag 21a is provided with a second opening/closing device 23a near the second opening, i.e., slightly below the upper edges of the second front sheet and the second back sheet. In FIG. 1, only the second front sheet side is shown, but the second opening/closing device 23a is provided at a similar position on the second back sheet side. In this specification, the "second opening" is defined as the area from the upper edges of the second front sheet and the second back sheet to the second opening/closing device 23a in the inner bag 21a, as in the case of the first opening. When the second opening/closing device 23a is disposed on the upper edges of the second front sheet and the second back sheet, the second opening is the upper edges of the second front sheet and the second back sheet, and means the second opening/closing device 23a. The same applies to the following embodiments, modifications, examples, etc. In other words, the second opening/closing device 23a is an opening/closing device that can freely open and close the second opening. The second opening/closing device 23a may be of any type, as long as it can be opened and closed freely, such as a zipper or a zipper with a slider, and can pseudo-seal (quasi-seal) the second opening when it is closed, as in the case of the pseudo-sealed state of the first opening. The "pseudo-sealed state of the second opening" when the second opening/closing device 23a is closed means, as in the case of the pseudo-sealed state of the first opening, a "pseudo-sealed" state that limits the conductance of oxygen inflow and outflow when focusing on the second opening, and does not refer to the "sealing (sealing)" of the inner bag 21a itself. Since the inner bag 21a has a plurality of oxygen supply holes that are provided through it, as in the case of the outer bag 11a, it is impossible for the second opening/closing device 23a to completely seal the inner bag 21a itself. The definitions of the "open state" and "closed state" of the second opening/closing device 23a in this specification are the same as those of the first opening/closing device 13a. The same applies to the following embodiments, modifications, examples, etc.

Although not shown in Fig. 1, the second front sheet and the second back sheet of the inner bag 21a are each provided with a plurality of oxygen supply holes similar to the plurality of oxygen supply holes 31a as through holes. That is, the oxygen supply holes penetrate the second front sheet along the thickness direction of the second front sheet, and penetrate the second back sheet along the thickness direction of the second back sheet. As with the definition of the hole-installable area _A1 , in this specification, the portion from the bottom edge of the second front sheet of the inner bag 21a shown by hidden lines in Fig. 1 to the height of the second opening/closing device 23a is defined as the "hole-installable area" of the second front sheet, and the entire area of the hole-installable area is defined as the "hole-installable area" of the second front sheet. For example, in the inner bag 21a, when the width of the second front sheet is 11 cm and the height from the bottom edge to the second opening/closing device 23a is 19 cm, the hole installation area is ^20,900 mm2, and the number of multiple oxygen supply holes provided in the second front sheet of the inner bag 21a is preferably 10 to 100, and more preferably 15 to 70. Then, when the hole installation area of the second front sheet is _A2 and the total area of the multiple oxygen supply holes in the second front sheet is _ΣS2 , the "critical open hole area ratio _η2 of the second front sheet" is given by:

η ₂ =ΣS ₂ /A ₂ ...(2)

It is defined as follows. Under the condition of an oxygen concentration of 20.95% in the air (near the ground surface), the critical open area ratio η ₂ of the second front sheet defined by formula (2) is preferably about 0.02 to 2.5%, and more preferably about 0.1 to 1.2%. Furthermore, the critical open area ratio η ₂ of the second front sheet is preferably _0.19 to 1.11%. The shape, equivalent diameter Φ eff , total area, etc. of the multiple oxygen supply holes provided in the second front sheet are similar to those of the multiple oxygen supply holes 31a. The number, shape, equivalent diameter Φ _eff , total area, etc. _of the multiple oxygen supply holes provided in the second back sheet are similar to those of the multiple oxygen supply holes provided in the second front sheet. The positions of the multiple oxygen supply holes provided in the second back sheet do not need to be the same as those of the multiple oxygen supply holes in the second front sheet. In addition, the positions of the oxygen supply holes provided in the inner bag 21a do not need to coincide with the positions of the oxygen supply holes including the oxygen supply holes 31a provided in the outer bag. The definitions of the equivalent diameter Φ _eff , hole installable region, hole installable area, critical open area ratio, etc. in the second front sheet and the second back sheet are the same in other embodiments, modified examples, examples, etc.

The oxygen supply holes provided on the second front sheet and the second back sheet may be aligned at a constant pitch or not, as with the oxygen supply holes 31a, but it is better to provide them evenly over the entire hole-installable area rather than concentrating them at specific locations. The oxygen supply holes provided on the second front sheet and the second back sheet do not necessarily need to be aligned with the positions of the oxygen supply holes including the oxygen supply holes 31a provided on the outer bag 11a. The pitch between the oxygen supply holes provided on the second front sheet may be any pitch as long as it is within the range of the critical open area ratio η ₂ of the second front sheet defined by formula (2) of about 0.02 to 2.5%. As with the oxygen supply holes 31a, the pitch between the oxygen supply holes provided on the second front sheet is preferably about 1.5 to 3.0 cm. The pitch and other considerations for the oxygen supply holes provided on the second back sheet are the same as those for the oxygen supply holes provided on the second front sheet.

The material and thickness of the second front sheet and second back sheet shown in Figure 1 may be the same as that of the first front sheet, or may be different.

The inner bag 21a forming the second bag-like flexible structure of the reaction restriction bag 1a according to the first embodiment may be any of a two-sided sealed bag, a three-sided sealed bag, a side sealed bag, a bottom sealed bag, etc. As shown in FIG. 1, the inner bag 21a according to the first embodiment does not have a gusset on the bottom or side, but may have a flat flexible structure with a gusset on the bottom or side, such as a bottom gusset bag or a side gusset bag. When the inner bag 21a has a gusset on the bottom or side, multiple oxygen supply holes may be provided in the gusset portion, similar to the multiple oxygen supply holes in the second front sheet.

As shown in Fig. 1, the inner bag 21a is disposed inside the outer bag 11a. In Fig. 1, the entire inner bag 21a from the bottom to the second joint ( _25a1 , _25a2 ) is housed inside the outer bag 11a. Here, "inside the outer bag 11a" refers to the internal space from the first opening and closing device 13a of the outer bag 11a to the bottom of the outer bag 11a, and includes the first opening and closing device 13a. The same applies to the following embodiments, modified examples, examples, etc. It is sufficient that at least the second opening and closing device 23a of the inner bag 21a is housed inside the outer bag 11a.

It is preferable that the inner bag 21a is fixed inside the outer bag 11a. At least either the second front sheet or the second back sheet of the inner bag 21a is preferably fixed to the inside of the corresponding first front sheet or the first back sheet of the outer bag 11a. The second opening and closing tool 23a of the inner bag 21a and the first opening and closing tool 13a of the outer bag 11a are preferably spaced apart from each other by about 0 to 2 cm in the depth direction of the outer bag 11a. When the second front sheet of the inner bag 21a is fixed to the first front sheet of the outer bag 11a, the second front sheet may be fixed to the inside of the first front sheet near the second opening and closing tool 23a or directly below the second opening and closing tool 23a, or may be fixed to the inside of the first front sheet near the top of the second opening and closing tool 23a and below the second front joining piece _25a1 . In addition, when the second front sheet of the inner bag 21a is fixed to the first front sheet of the outer bag 11a, it may be fixed near the bottom edge of the second front sheet. The same applies when the second back sheet of the inner bag 21a is fixed to the first back sheet of the outer bag 11a. From the viewpoint of stability when a product (oxidation-controlling heating element) is stored inside, both the second front sheet and the second back sheet of the inner bag 21a may be fixed to the inside of the first front sheet and the first back sheet of the outer bag 11a that face each other. In addition, both the second front sheet and the second back sheet of the inner bag 21a may be fixed to the first front sheet or the first back sheet of the outer bag 11a.

When the outer bag 11a and the inner bag 21a are both bag _- shaped without gussets, the hole installation area ratio _A1 : _A2 is preferably about 3:1 to 1.4:1, and more preferably about _1.8 :1 to 1.4:1. As shown in Fig. 3, when the inner bag 21a is fixed so that the vertical central axes of the outer bag 11a and the inner bag 21a are aligned, the ratio of the distance _d1 to the width of the outer bag 11a is preferably about 1:4 to 1:10, the ratio of the distance _d2 to the distance from the bottom side of the outer bag 11a to the first opening and closing device 13a is preferably about 1:3 to 1:40, and the ratio of the distance _d3 to the distance from the bottom side of the outer bag 11a to the first opening and closing device 13a is preferably about 1:13 to 1:50. The distance _d3 is preferably about 0 to 2 cm, regardless of the distance from the bottom side of the outer bag 11a to the first opening/closing device 13a.

As described at the beginning, the reaction limiting bag 1a according to the first embodiment stores the oxidation-rate-limiting heating element 100 inside the inner bag 21a as shown in Figs. 2 to 4. First, as shown in Fig. 6, the outer bag 11a and the inner bag 21a are both opened, and the oxidation-rate-limiting heating element 100 is placed in the inner heat storage space 43a, which is the air layer of the inner bag 21a. Note that, for the sake of simplicity, the illustration of the multiple oxygen supply holes including the multiple oxygen supply holes 31a is omitted in Figs. 4 to 6. Also, Figs. 4 to 6 show an example in which the inner bag 21a is fixed to the outer bag 11a slightly below the second opening/closing device 23a, that is, at the inner bag fixing parts 51a and 51b. There are no limitations on the raw materials, etc., of the oxidation-rate-limiting heating element 100 stored in the reaction limiting bag 1a according to the first embodiment, as long as it is an oxidation-rate-limiting heating element that relies on an oxidation reaction via oxygen in the air. For example, oxidation-limited heating elements well known as "disposable hand warmers (portable heating devices)" often contain heat generating compositions such as iron powder, iron oxide powder, salt, polymeric water absorbents, activated carbon, and vermiculite as oxidation-limited heat generating particles. These heat generating compositions are usually covered with breathable packaging materials such as nonwoven fabrics and paper, but the covers are not shown in Figures 4 to 6. In some breathable packaging materials such as nonwoven fabrics, pinholes with an equivalent diameter Φ _eff of 1 to several tens of μm are punched, but in some cases, pinholes are formed in a band shape with a width of 3 to 5 cm in a concentrated manner in order to increase the heat generation rate. The diameter and arrangement of the pinholes punched in the breathable packaging material are determined so that the air permeability value measured by a Gurley air permeability meter is 2 to 10 seconds/300 cc. In addition, in Figs. 4 to 6, the cross section of the oxidation-limiting heating element 100 is illustrated as a vertically long oval shape having two pointed ends, but this is merely an example, and the shape may be flatter than the cross section of the oxidation-limiting heating element 100 illustrated in Figs. 4 to 6. For example, when the oxidation-limiting heating element 100 is a portable heating device, it can be suitably used in either a type that is attached to clothing or a type that is not attached. In the case of a type that is attached, the backing may be peeled off so that the seal part is exposed, or it may be placed in the inner bag 21a without peeling it off. When a portable heating device is used as the oxidation-limiting heating element 100, it may be taken out of the bag of non-breathable packaging material and immediately placed in the inner bag 21a, or it may be taken out of the bag of non-breathable packaging material and slightly kneaded with the hands before being placed in the inner bag 21a. There is no limit to the size of the oxidation-limiting heating element 100 as long as it can be placed in the inner bag 21a.

Next, as shown in Fig. 5, the second opening/closing tool 23a is closed to close the inner bag 21a. The inner heat storage space 43a is in a state where oxygen is blocked from entering and leaving the outside atmosphere except for the multiple oxygen supply holes of the inner bag 21a. In Fig. 5, the outer bag 11a is in an open state, so oxygen can freely enter and leave the outer heat storage space 41a, which is an air layer, through the first opening. When closing the second opening/closing tool 23a, it is easier to operate by using the second joint parts ( _25a1 , _25a2 ) as a guide. When closing the second opening/closing tool 23a, it is not necessary to intentionally introduce air such as oxygen into the inner heat storage space 43a.

Next, as shown in Fig. 4, the first opening/closing device 13a is closed to close the outer bag 11a. The outer heat storage space 41a is in a state where oxygen inflow and outflow from the external atmosphere is blocked except for the multiple oxygen supply holes of the outer bag 11a. When closing the first opening/closing device 13a, it is easier to operate it by using the first joint parts ( _15a1 , _15a2 ) as a guide. When closing the first opening/closing device 13a, it is not necessary to intentionally introduce air such as oxygen into the outer heat storage space 41a. The reaction limiting bag 1a according to the first embodiment in the state shown in Fig. 4 is used by directly contacting a desired part of the human body or indirectly contacting it via clothing or the like.

When the use of the oxidation-limiting heating element 100 in the reaction limiting bag 1a according to the first embodiment is finished, the process of removing the used oxidation-limiting heating element 100 is performed in the opposite manner to the process of storing the oxidation-limiting heating element 100, that is, along the flow from FIG. 4 to FIG. 6. From the state of FIG. 4, the state of FIG. 5 in which only the outer bag 11a is open is changed to the state of FIG. 6 in which the inner bag 21a is also open, and the oxidation-limiting heating element 100 can be removed. In this case, if the outer bag 11a is opened vigorously with a somewhat strong force in the state of FIG. 4, the inner bag 21a can also be opened at the same time, and it is also possible to move from the state of FIG. 4 to the state of FIG. 6 without passing through FIG. 5. In this case, the effort of opening the bag twice can be partially eliminated.

According to the reaction limiting bag 1a of the first embodiment, if the oxidation-limiting heating element 100 is a normal portable heating device with an average temperature of 50 to 65° C. and a rated duration of 12 to 20 hours at or above 40° C., the oxidation-limiting heating element 100 can be effectively used for a heating time of 48 hours or more on human skin at a surface temperature of about 30 to 35° C. In addition, if the surface temperature of the reaction limiting bag 1a is about 35 to 45° C., the oxidation-limiting heating element 100 can be effectively used for a heating time of about 30 to 55 hours. In addition, if the oxidation-limiting heating element 100 is a normal portable heating device with an average temperature of 50 to 65°C and a rated duration of 12 to 20 hours at or above 40°C, when the area of the region in which the first holes can be installed in the reaction limiting bag 1a according to the first embodiment is less than 400 ^cm2 , the equivalent diameter Φ _eff of the multiple oxygen supply holes is 1.6 to 3.0 mm, the critical open hole area ratio η ₁ of the first front sheet is 0.11 to 0.83%, and the critical open hole area ratio η ₂ of the second front sheet is 0.19 to 1.11%, the maximum temperature of the surface of the reaction limiting bag 1a according to the first embodiment will not exceed 42°C, the average temperature 2 to 24 hours after use will be less than 40°C, and the heating effect will continue for 36 hours or more. Therefore, even if the reaction limiting bag 1a according to the first embodiment is used so as to come into direct contact with the skin of the human body, the possibility of low-temperature burns occurring is extremely low, and a safe and comfortable feeling of use for the human body can be obtained.

According to the reaction limiting bag 1a of the first embodiment, the two layers of heat storage space (air layer), the inner heat storage space 43a and the outer heat storage space 41a, allow the oxidation-limiting heating element 100 to be used over a larger heat retention area.

When using the reaction limiting bag 1a according to the first embodiment at a higher temperature, the reaction limiting bag 1a can be slightly kneaded, or only the outer bag 11a can be opened, to expose the oxidation-rate-limiting heating element 100 to more oxygen, thereby intentionally raising the temperature of the oxidation-rate-limiting heating element 100. In particular, by finely adjusting the degree to which the outer bag 11a is open, it is possible to finely adjust the degree of temperature rise while preventing a sudden rise in temperature.

(First Modification of the First Embodiment)
The reaction limiting bag 1b according to the first modification of the first embodiment of the present invention has a flat flexible structure including an outer bag 11b and an inner bag 21b, as shown in Fig. 7. The outer bag 11b has a first bag shape with a first opening at the upper end, a first front sheet and a first back sheet facing the first front sheet as main members, and has a first opening/closing device 13b near the first opening. The inner bag 21b has a second bag shape with a second opening at the upper end, a second opening/closing device 23b near the second opening, and is disposed inside the outer bag 11b. A plurality of oxygen supply holes 31b penetrating the first front sheet, and a plurality of oxygen supply holes penetrating the second front sheet and the first and second back sheets, respectively, similar to the plurality of oxygen supply holes 31b. As shown in Fig. 7, a first joint portion ( _15b1 , _15b2 ) is provided near the center of the upper side of each of the first front sheet and the first back sheet. The first joint portion ( _15b1 , _15b2 ) is composed of a rectangular first front joint piece _15b1 connected to the first front sheet side and a rectangular first back joint piece _15b2 connected to the first back sheet side. As shown in Fig. 7, a second joint portion ( _25b1 , _25b2 ) is provided near the center of the upper side of each of the second front sheet and the second back sheet. The second joint portion ( _25b1 , _25b2 ) is composed of a rectangular second front joint piece _25b1 connected to the second front sheet side and a rectangular second back joint piece _25b2 connected to the second back sheet side.

As shown in FIG. 7, the reaction restriction bag 1b according to the first modification of the first embodiment is different from the reaction restriction bag 1a according to the first embodiment only in that it has protective parts 91a, 91b, 91c, and 91d. The protective parts 91a, 91b, 91c, and 91d are parts fixed to the four corners of the outer bag 11b, respectively, to protect the four corners of the outer bag 11b. The reaction restriction bag 1b according to the first modification of the first embodiment, like the reaction restriction bag 1a according to the first embodiment, stores an oxidation-rate-limiting heating element whose heat generation is rate-limiting by an oxidation reaction such as a portable heating device inside, and is used by directly contacting a desired part of the human body or indirectly contacting the desired part of the human body through clothing, etc. Since the reaction restriction bag 1b according to the first modification of the first embodiment has the protective parts 91a, 91b, 91c, and 91d, it is possible to prevent the reaction restriction bag 1b from getting caught on a desired part of the human body or clothing, etc. The protective portions 91a, 91b, 91c, and 91d are preferably made of fibers such as felt, but the material is not critical.

According to the reaction limiting bag 1b of the first modification of the first embodiment, if the oxidation-limited heating element 100 is a normal portable heating device (oxidation-limited heating element) with an average temperature of 50 to 65°C and a rated duration of 12 to 20 hours at or above 40°C, the oxidation-limited heating element 100 can be effectively used for a heating time of 48 hours or more on human skin at a surface temperature of about 30 to 35°C. Also, if the surface temperature of the reaction limiting bag 1b is about 35 to 45°C, the oxidation-limited heating element 100 can be effectively used for a heating time of about 30 to 55 hours. In addition, if the oxidation-limiting heating element 100 is a normal portable heating device with an average temperature of 50 to 65°C and a rated duration of 12 to 20 hours at or above 40°C, when the area of the region in which the first holes can be installed in the reaction limiting bag 1b according to the first modified example of the first embodiment is less than ⁴⁰⁰ cm2, the equivalent diameter Φ _eff of the multiple oxygen supply holes is 1.6 to 3.0 mm, the critical open area rate η ₁ of the first front sheet is 0.11 to 0.83%, and the critical open area rate η ₂ of the second front sheet is 0.19 to 1.11%, the maximum temperature of the surface of the reaction limiting bag 1b according to the first modified example of the first embodiment will not exceed 42°C, the average temperature 2 to 24 hours after use will be less than 40°C, and the heating effect will continue for 36 hours or more. Therefore, even if the reaction limiting bag 1b according to the first modified example of the first embodiment is used so that it comes into direct contact with the skin of the human body, there is an extremely low possibility of low-temperature burns occurring, and a safe and comfortable feeling of use for the human body can be obtained.

According to the reaction limiting bag 1b relating to the first modified example of the first embodiment, the two layers of heat storage space (air layer), the inner heat storage space and the outer heat storage space, allow the oxidation-limiting heating element to be used over a larger heat retention area.

According to the reaction limiting bag 1b of the first modified example of the first embodiment, when it is desired to use the oxidation-rate-limiting heating element at a higher temperature, the reaction limiting bag 1b can be slightly kneaded, or only the outer bag 11b can be opened, so that the oxidation-rate-limiting heating element can be exposed to more oxygen and the temperature of the oxidation-rate-limiting heating element can be intentionally increased. In particular, by finely adjusting the degree to which the outer bag 11b is open, it is possible to finely adjust the degree of temperature increase of the oxidation-rate-limiting heating element while preventing a sudden increase in temperature of the oxidation-rate-limiting heating element.

(Second Modification of the First Embodiment)
The reaction limiting bag 1c according to the second modification of the first embodiment of the present invention has a flat flexible structure including an outer bag 11c and an inner bag 21c, as shown in Fig. 8. The outer bag 11c has a first bag shape with a first opening at the upper end, a first front sheet and a first back sheet facing the first front sheet as main members, and has a first opening/closing device 13c near the first opening. The inner bag 21c shown by hidden lines has a second bag shape with a second opening at the upper end, a second opening/closing device 23c near the second opening, and is disposed inside the outer bag 11c. A plurality of oxygen supply holes 31c penetrating the first front sheet, and a plurality of oxygen supply holes penetrating the second front sheet and the first and second back sheets, respectively, similar to the plurality of oxygen supply holes 31c. As shown in Fig. 7, a first joint portion ( _15c1 , _15c2 ) is provided near the center of the upper side of each of the first front sheet and the first back sheet. The first joint portion ( _15c1 , _15c2 ) is composed of a rectangular first front joint piece _15c1 connected to the first front sheet side and a rectangular first back joint piece _15c2 connected to the first back sheet side. As shown in Fig. 7, a second joint portion ( _25c1 , _25c2 ) is provided near the center of the upper side of each of the second front sheet and the second back sheet. The second joint portion ( _25c1 , _25c2 ) is composed of a rectangular second front joint piece _25c1 connected to the second front sheet side and a rectangular second back joint piece _25c2 connected to the second back sheet side.

As shown in FIG. 8, the reaction restriction bag 1c according to the second modified example of the first embodiment is different from the reaction restriction bag 1a according to the first embodiment only in that it has protective parts 91e, 91f, and 91g. The protective parts 91e, 91f, and 91g are fixed to the three sides of the outer bag 11c other than the upper side including the first opening, and are parts that protect the outer periphery of the outer bag 11c. The reaction restriction bag 1c according to the second modified example of the first embodiment, like the reaction restriction bag 1a according to the first embodiment, stores an oxidation-rate-limiting heating element such as a portable heating device inside and is used by contacting a desired part of the human body directly or indirectly through clothing, etc. The reaction restriction bag 1c according to the second modified example of the first embodiment has the protective parts 91e, 91f, and 91g, so that the reaction restriction bag 1c can be prevented from getting caught on a desired part of the human body or clothing, etc. The protective parts 91e, 91f, and 91g are preferably made of fibers such as felt, but the material is not important.

According to the reaction limiting bag 1c of the second modified example of the first embodiment, if the oxidation-limited heating element 100 is a normal portable heating device (oxidation-limited heating element) with an average temperature of 50 to 65°C and a rated duration of 12 to 20 hours at or above 40°C, the oxidation-limited heating element 100 can be effectively used for a heating time of 48 hours or more on human skin at a surface temperature of about 30 to 35°C. Also, if the surface temperature of the reaction limiting bag 1c is about 35 to 45°C, the oxidation-limited heating element 100 can be effectively used for a heating time of about 30 to 55 hours. In addition, if the oxidation-limiting heating element 100 is a normal portable heating device with an average temperature of 50 to 65 ^° C and a rated duration of 12 to 20 hours at or above 40°C, when the area of the region in which the first hole can be installed in the reaction limiting bag 1c according to the second modified example of the first embodiment is less than 400 cm2, the equivalent diameter Φ _eff of the multiple oxygen supply holes is 1.6 to 3.0 mm, the critical open area rate η ₁ of the first front sheet is 0.11 to 0.83%, and the critical open area rate η ₂ of the second front sheet is 0.19 to 1.11%, the maximum temperature of the surface of the reaction limiting bag 1c according to the second modified example of the first embodiment will not exceed 42°C, the average temperature 2 to 24 hours after use will be less than 40°C, and the heating effect will continue for 36 hours or more. Therefore, even if the reaction limiting bag 1c according to the second modified example of the first embodiment is used so that it comes into direct contact with the skin of the human body, the possibility of low-temperature burns occurring is extremely low, and a safe and comfortable feeling of use for the human body can be obtained.

According to the reaction limiting bag 1c relating to the second modified example of the first embodiment, the two layers of heat storage space (air layer), the inner heat storage space and the outer heat storage space, make it possible to use a normal portable heating device (oxidation-limited heating element) with a larger heat retention area.

According to the reaction limiting bag 1c of the second modified example of the first embodiment, when it is desired to use a normal portable heating device (oxidation-limited heating element) at a higher temperature, the reaction limiting bag 1c can be slightly kneaded, or only the outer bag 11c can be opened, so that the normal portable heating device (oxidation-limited heating element) is exposed to more oxygen and the temperature of the normal portable heating device (oxidation-limited heating element) can be intentionally increased. In particular, by finely adjusting the degree of opening of the outer bag 11c, it is possible to finely adjust the degree of temperature increase of the normal portable heating device (oxidation-limited heating element) while preventing a sudden increase in temperature of the normal portable heating device (oxidation-limited heating element).

Second Embodiment
The reaction limiting bag 2 according to the second embodiment of the present invention has a flat flexible structure consisting of a double bag structure of an outer bag 11d having a first opening at the top end and an inner bag 21d having a second opening at the top end like the outer bag 11d, as shown in Fig. 9. As shown in Fig. 9, a plurality of oxygen supply holes 31d are provided penetrating both sides of the outer bag 11d, i.e., the first front sheet of the outer bag 11d and the first back sheet facing the first front sheet. Note that the plurality of oxygen supply holes in the first back sheet of the outer bag 11d are not shown. Similarly, although not shown, a plurality of oxygen supply holes are provided penetrating both sides of the inner bag 21d, i.e., the second front sheet of the inner bag 21d and the second back sheet facing the second front sheet.

As shown in Fig. 9, the outer bag 11d constituting the reaction restriction bag 2 according to the second embodiment is a first bag-like shape having a first opening at the upper end, with a first front sheet and a first back sheet as main members. In Fig. 9, the first front sheet and the first back sheet are both rectangular and have the same shape, so the outer bag 11d is a flattened rectangular bag-like flexible container. The first front sheet and the first back sheet are connected to each other at three sides other than the upper sides, and the upper sides are not connected to each other, functioning as the first opening.

As shown in FIG. 9, the first joints (15d ₁ , 15d ₂ ) are provided near the center of the upper edge of each of the first front sheet and the first back sheet. The first joints (15d ₁ , 15d ₂ ) are composed of a rectangular first front joint piece 15d ₁ connected to the first front sheet side and a rectangular first back joint piece 15d ₂ connected to the first back sheet side. In FIG. 9 and other figures, the first front joint piece 15d ₁ is shown as being fixed only to the outside of the first front sheet, but the illustration in FIG. 9 and other figures is only an example, and it may be fixed so as to sandwich the first front sheet, or may be fixed only to the inside of the first front sheet, or may be otherwise. In addition, the shape of the first front joint piece 15d ₁ is shown as a rectangular thin piece in FIG. 9 and other figures, but it may be any shape other than a rectangle, such as a polygon, a circle, an ellipse, etc. The same fixing style and shape apply to the first back joint piece 15d ₂ . The first joints ( _15d1 , _15d2 ) are members for making it easier to change the outer bag 11d from a closed state to an open state, and may be integral with the first front sheet and the first back sheet, respectively, or may not necessarily be present on the outer bag 11d in the first place.

As shown in FIG. 9, the outer bag 11d is provided with a first opening/closing device 13d near the first opening, that is, slightly below the upper edges of the first front sheet and the first back sheet. In FIG. 9, only the first front sheet side is shown, but the first opening/closing device 13d is provided at a similar position on the first back sheet side. That is, the first opening/closing device 13d is an opening/closing device that can freely open and close the first opening. The first opening/closing device 13d can be a zipper, a zipper with a slider, or any other type as long as it can be opened and closed and can achieve a pseudo-sealed state of the first opening when in the closed state. A zipper can be in a pseudo-sealed state by fitting one convex rail (male member) and the other concave rail (female member) with the fingers of a hand or the like. A zipper with a slider can fit the convex rail and the concave rail together by moving the slider in one lateral direction. In either case, the fitting between the convex rail and the concave rail can be released to move from the closed state to the open state.

The number of the oxygen supply holes 31d provided in the first front sheet of the outer bag 11d shown in Fig. 9 is preferably about 50 to 100, more preferably 70 to 90, when the width of the first front sheet of the outer bag 11d is 16 cm and the height from the bottom side to the first opening/closing device 13d is 19.5 cm. The shape of the oxygen supply holes 31d may be any shape, such as a polygon or a circle, but holes with an equivalent diameter Φ _eff of 0.1 to 3 mm are preferred, and holes with an equivalent diameter Φ _eff of 1.6 to 3.0 mm are more preferred. Assuming that the oxygen supply holes 31d are circular, if the equivalent diameter Φ _eff is significantly greater than 3.0 mm, the amount of oxygen flowing in and out of the holes becomes too large. In the "hole installation possible region" which is the portion from the bottom edge of the first front sheet to the height of the first opening/closing device 13d, the critical open area ratio η 1 of the first front sheet at an oxygen concentration of 20.95%, defined in the same manner as in formula (1), is preferably about _0.02 to 2.5%, and more preferably about _0.1 to 1.0%. Furthermore, the critical open area ratio η ₁ of the first front sheet is preferably 0.11 to 0.83%. The number, shape, equivalent diameter Φ _eff , total area, etc. of the multiple oxygen supply holes provided in the first back sheet are considered in the same way as the multiple oxygen supply holes 31d in the first front sheet.

The oxygen supply holes 31d shown in FIG. 9 may be aligned at a constant pitch or may not be aligned as shown in FIG. 9 and the like. However, it is better to provide the oxygen supply holes 31d evenly over the entire hole-installable area rather than concentrating them in a specific location. The pitch between the oxygen supply holes 31d may be any pitch as long as it is within the range of the critical open area ratio η ₁ of the first front sheet of about 0.02 to 2.5%. For example, in the outer bag 11d, when the width of the first front sheet is 16 cm, the height from the bottom edge to the first opening/closing device 13d is 19.5 cm, and each of the oxygen supply holes 31d has an equivalent diameter Φ _eff of 1.6 mm, it is preferable that the pitch between the oxygen supply holes 31d is about 1.5 to 3.0 cm, and the number of the oxygen supply holes 31d is about 25 to 90. The idea of the pitch and the like for the oxygen supply holes provided in the first back sheet is the same as for the oxygen supply holes 31d. The positions of the oxygen supply holes provided in the first back sheet do not need to coincide with the positions of the oxygen supply holes 31d in the first front sheet.

The material and thickness of the first front sheet and first back sheet shown in Figure 9 may be the same as those of the first front sheet and first back sheet in the first embodiment.

The outer bag 11d according to the second embodiment shown in Fig. 9 has two main surfaces, a first front sheet and a first back sheet, but the first bag-like flexible structure may be any of a two-sided sealed bag, a three-sided sealed bag, a side sealed bag, a bottom sealed bag, etc. As shown in Fig. 9, the outer bag 11d according to the second embodiment does not have a gusset on the bottom or sides, but may be a type having a gusset on the bottom or sides, such as a bottom gusset bag or a side gusset bag. If the outer bag 11d has a gusset on the bottom or sides, multiple oxygen supply holes may be provided in the gusset portion, similar to the multiple oxygen supply holes 31d.

As shown in Figures 9, 12 and 13, the inner bag 21d of the reaction restriction bag 2 according to the second embodiment is a second bag-like shape having a second opening at the upper end, with a second front sheet and a second back sheet as main members. In Figure 9, the second front sheet and the second back sheet are both rectangular and have the same shape, so the inner bag 21d is a flattened rectangular bag-like flexible container. The second front sheet and the second back sheet are connected to each other at three sides other than the upper sides, and the upper sides are not connected to each other, functioning as a second opening.

12 and 13, the inner bag 21d is provided with a second opening, i.e., a first opening/closing device 13d that also serves as a second opening/closing device, on the upper edges of the second front sheet and the second back sheet. As shown in Fig. 12 and 13, the upper end of the inner bag 21d is the second opening, which is opened and closed by the first opening/closing device 13 in conjunction with the opening and closing of the outer bag 11d.

Although not shown in Fig. 9, the second front sheet and the second back sheet of the inner bag 21d are provided with a plurality of oxygen supply holes similar to the plurality of oxygen supply holes 31d. For example, in the inner bag 21d, when the width of the second front sheet is 11 cm and the height from the bottom side to the second opening is 19 cm, the hole installation area is ^20,900 mm2, and the number of the plurality of oxygen supply holes 31d provided in the second front sheet of the inner bag 21d is preferably 10 to 100, and more preferably 15 to 70. Under the condition of an oxygen concentration of 20.95% in the air (near the ground surface), the critical open area ratio η ₂ of the second front sheet defined in the same manner as in formula (2) is preferably 0.02 to 2.5%, and more preferably 0.1 to 1.2%. Furthermore, _{the critical open area ratio η 2 of} the second front sheet is preferably 0.19 to 1.11%. The shape, equivalent diameter Φ _eff , total area, and other considerations of the multiple oxygen supply holes provided in the second front sheet are the same as those of the multiple oxygen supply holes 31d. The number, shape, equivalent diameter Φ _eff , total area, and other considerations of the multiple oxygen supply holes provided in the second back sheet are the same as those of the multiple oxygen supply holes provided in the second front sheet. The positions of the multiple oxygen supply holes provided in the second back sheet do not need to match the positions of the multiple oxygen supply holes in the second front sheet. In addition, the positions of the multiple oxygen supply holes provided in the inner bag 21d do not need to match the positions of the multiple oxygen supply holes including the multiple oxygen supply holes 31d provided in the outer bag 11d.

The oxygen supply holes provided on the second front sheet and the second back sheet may be aligned at a constant pitch or not, as with the oxygen supply holes 31d, but it is better to provide them evenly over the entire hole-installable area rather than concentrating them at specific locations. The oxygen supply holes provided on the second front sheet and the second back sheet do not necessarily need to be aligned with the positions of the oxygen supply holes including the oxygen supply holes 31d provided on the outer bag 11d. The pitch between the oxygen supply holes provided on the second front sheet may be any pitch as long as it is within the range of the critical open area ratio η ₂ of the second front sheet = 0.02 to 2.5%. As with the oxygen supply holes 31d, the pitch between the oxygen supply holes provided on the second front sheet is preferably about 1.5 to 3.0 cm. The pitch and other considerations for the oxygen supply holes provided on the second back sheet are the same as those for the oxygen supply holes provided on the second front sheet.

The material and thickness of the second front sheet and the second back sheet shown in FIG. 9 may be the same as that of the first front sheet, or may be different.

The inner bag 21d according to the second embodiment shown in Fig. 9 has two main surfaces, a second front sheet and a second back sheet, but the second bag-like flexible structure may be any of a two-sided sealed bag, a three-sided sealed bag, a side sealed bag, a bottom sealed bag, etc. As shown in Fig. 9, the inner bag 21d according to the second embodiment does not have a gusset on the bottom or side, but may be a type having a gusset on the bottom or side, such as a bottom gusset bag or a side gusset bag. If the inner bag 21d has a gusset on the bottom or side, multiple oxygen supply holes may be provided in the gusset portion, similar to the multiple oxygen supply holes in the second front sheet.

As shown in FIG. 9, the inner bag 21d is disposed inside the outer bag 11d. In FIG. 9, the entire inner bag 21d from the bottom to the second opening is stored inside the outer bag 11d. It is preferable that the inner bag 21d is fixed inside the outer bag 11d. It is preferable that either the second front sheet or the second back sheet of the inner bag 21d is fixed to the inside of the first front sheet or the first back sheet of the outer bag 11d that faces it. Also, when the second front sheet of the inner bag 21d is fixed to the first front sheet of the outer bag 11d, it may be fixed near the bottom of the second front sheet. From the viewpoint of stability when a product (oxidation-rate-limiting heating element) is stored inside, both the second front sheet and the second back sheet of the inner bag 21d may be fixed to the inside of the first front sheet and the first back sheet of the outer bag 11d that faces it. In addition, both the second front sheet and the second back sheet of the inner bag 21d may be fixed to the first front sheet or the first back sheet of the outer bag 11d.

When the outer bag 11d and the inner bag 21d are both bag _- shaped without gussets, the hole installation area ratio _A1 : _A2 is preferably about 3:1 to 1.4:1, and more preferably about _1.8 :1 to 1.4:1. As shown in Fig. 11, when the inner bag 21d is fixed so that the vertical central axes of the outer bag 11d and the inner bag 21d are aligned, the ratio of the distance _d4 to the width of the outer bag 11d is preferably about 1:4 to 1:10, and the ratio of the distance _d5 to the distance from the bottom side of the outer bag 11d to the first opening/closing device 13d is preferably about 1:3 to 1:40.

As shown in Figures 10 to 13, the reaction limiting bag 2 according to the second embodiment is used by storing an oxidation-limiting heating element 100 inside the inner bag 21d, similar to the reaction limiting bag 1a according to the first embodiment. First, as shown in Figure 13, both the outer bag 11d and the inner bag 21d are opened, and the oxidation-limiting heating element 100 is placed in the inner heat storage space 43d, which is the air layer of the inner bag 21d. Note that in Figures 12 and 13, for the sake of simplicity, the multiple oxygen supply holes, including the multiple oxygen supply holes 31d, are omitted from the illustration. The oxidation-limiting heating element 100 can be, for example, a commercially available portable heating device, and the oxidation-limiting heating element 100 similar to that described in the first embodiment is assumed.

Next, as shown in FIG. 12, the first opening/closing tool 13d, which also serves as the second opening/closing tool, is closed to close both the outer bag 11d and the inner bag 21d. The outer heat storage space 41d and the inner heat storage space 43d, which are air layers, are in a state in which oxygen inflow and outflow from the external atmosphere is blocked except for the multiple oxygen supply holes of the outer bag 11d and the inner bag 21d. When closing the first opening/closing tool 13d, it is easier to operate it by using the first joint parts (15d ₁ , 15d ₂ ) as a guide. When closing the first opening/closing tool 13d, it is not necessary to intentionally introduce air such as oxygen into the outer heat storage space 41d and the inner heat storage space 43d. The reaction limiting bag 2 according to the second embodiment in the state shown in FIG. 12 is used by directly contacting a desired part of the human body or indirectly contacting the desired part of the human body via clothing or the like.

When the use of the oxidation-rate-limiting heating element 100 using the reaction limiting bag 2 according to the second embodiment is finished, the process of storing the oxidation-rate-limiting heating element 100 is reversed, that is, the process is performed by following the flow from Figure 12 to Figure 13 to remove the used oxidation-rate-limiting heating element 100. From the state shown in Figure 12, the state shown in Figure 13 in which both the outer bag 11d and the inner bag 21d are open is changed, and the oxidation-rate-limiting heating element 100 can be removed.

According to the reaction limiting bag 2 of the second embodiment, if the oxidation-limiting heating element 100 is a normal portable heating device with an average temperature of 50 to 65°C and a rated duration of 12 to 20 hours at or above 40°C, the oxidation-limiting heating element 100 can be effectively used for a heating time of 48 hours or more on human skin at a surface temperature of about 30 to 35°C. Also, if the surface temperature of the reaction limiting bag 2 is about 35 to 45°C, the oxidation-limiting heating element 100 can be effectively used for a heating time of about 30 to 55 hours. In addition, if the oxidation rate-limiting heating element 100 is a normal portable heating device with an average temperature of 50 to 65°C and a rated duration of 12 to 20 hours at or above 40°C, when the area of the region in which the first holes can be installed in the reaction limiting bag 2 according to the second embodiment is less than 400 cm2, the equivalent diameter Φ _eff of the multiple oxygen supply holes is 1.6 to 3.0 mm, the critical open area rate η1 of the first front sheet is 0.11 to 0.83%, and the critical open area rate η2 of the second front sheet is 0.19 to 1.11%, the maximum temperature of the surface of the reaction limiting bag 2 according to the second embodiment will not exceed 42°C, the average temperature 2 to 24 hours after use will be less than 40°C, and the heating effect will continue for 36 hours or more. Therefore, even if the reaction limiting bag 2 according to the second embodiment is used so as to come into direct contact with the skin of the human body, there is an extremely low possibility of low-temperature burns occurring, and a safe and comfortable feel for the human body can be obtained.

According to the reaction limiting bag 2 of the second embodiment, the two-layer heat storage space of the inner heat storage space 43d and the outer heat storage space 41d allows the oxidation-limiting heating element 100 to be used with a larger heat retention area.

According to the reaction limiting bag 2 of the second embodiment, when it is desired to use the oxidation-limiting heating element 100 at a higher temperature, the reaction limiting bag 2 can be lightly kneaded, for example, to expose the oxidation-limiting heating element 100 to more oxygen, thereby intentionally raising the temperature of the oxidation-limiting heating element 100.

Third Embodiment
The footwear cover 6 according to the third embodiment of the present invention is a garment in which the various reaction restriction bags exemplified in the first and second embodiments are further placed in a bag-shaped pocket (attachment bag) to keep the ankle warm (also simply referred to as "various reaction restriction bags" in the fourth embodiment, the modified example of the fourth embodiment, and other embodiments described below). That is, as shown in Figures 14(a) and (b), the footwear cover 6 according to the third embodiment has the shape of a high-shaft boot having a flexible shaft (tubular part) 61 and a tabi sole 65 continuous with the shaft 61. The bird's-eye views of Figures 14(a) and (b) show that the outer surface of the flexible shaft 61 is softly wavy and bent. The attachment bag in which the various reaction restriction bags are stored is set on the inner wall of the shaft 61 surrounding the ankle so as to form a curved surface, and the attachment bag of the footwear cover 6 is designed to keep the area around the ankle warm. Although only one of the shoes is shown in Fig. 14(a) and (b), it is used in pairs with the other footwear cover of a symmetrical shape. The footwear cover 6 according to the third embodiment has a structure in which the rear (heel side) of the shaft 61 opens. On the other hand, the wearing bag 4 may have a flat structure as shown in Fig. 15. The wearing bag 4 shown in Fig. 15 is composed of a wearing bag main body 67 and two suspension parts 67a and 67b, each of which has a ring-shaped upper end connected to the upper part of the wearing bag main body 67. First, various reaction-limiting bags containing products such as portable heating devices (oxidation-limiting heating elements) are placed in the wearing bag main body 67 of the wearing bag 4. When the rear of the shaft 61 is opened, the flexible part of the shaft 61 unfolds almost horizontally, and the inner wall of the shaft 61 is exposed, so that the button-shaped wearing bag fasteners B8 and B9 can be seen on the upper surface of the shaft 61. For this reason, the attachment bag 4 containing the reaction limiting bag is suspended at its suspension parts 67a and 67b from the upper part of the shaft 61 by the button-shaped attachment bag fasteners B8 and B9 shown in Fig. 14(b). Then, a foot wearing indoor slippers or other footwear is placed into the footwear cover 6 while still wearing the footwear, and the open rear side is closed to fit the shape of the calf by fasteners such as button-shaped shaft fasteners B1 to B5, causing the flexible shaft 61 to rise, and the shaft 61 becomes cylindrical to protect the ankle and the entire foot. Alternatively, the attachment bag 4 may be suspended from the upper part of the shaft 61 by the attachment bag fasteners B8 and B9 with the rear part of the shaft 61 open after the foot wearing the foot is placed. In this case, when the attachment bag 4 is suspended from the upper part of the shaft 61, the rear side of the shaft 61 is closed by fasteners such as shaft fasteners B1 to B5 so that the open rear side is aligned with the shape of the calf, and the flexible shaft 61 stands up, and the shaft 61 becomes cylindrical to protect the entire ankle and foot. The attachment bag 4 is suspended from the upper part of the shaft 61, and various reaction restriction bags are fixed along the inner wall of the shaft 61. The attachment bag 4 shown in FIG. 15 is merely an example structure, and it goes without saying that attachment bags of other structures may be used. In addition, the structure of the attachment bag fasteners B8 and B9 is also merely an example, and does not have to be button-shaped. The positions of the attachment bag fasteners B8 and B9 are not limited to the positions shown in FIG. 14(b), and can be installed at any position on the inner wall of the shaft 61, and various reaction restriction bags can be fixed at any position on the inner wall of the shaft 61. The shape of the shaft fasteners such as shaft fasteners B1 to B5 is also not limited to the button shape. The material of the shaft 61 of the footwear cover 6 is not particularly limited, but it is preferably a fiber with high heat retention. The footwear cover 6 according to the third embodiment, together with the various reaction limiting bags exemplified in the first embodiment, etc., constitutes clothing that keeps the human foot warm.

The footwear cover 6 according to the third embodiment is a garment designed to be used with the footwear inside, so that the footwear can be used indoors with the footwear inside slippers. However, it does not necessarily have to be used with footwear, and it can also be used with the foot without footwear. The footwear cover 6 according to the third embodiment can be used both indoors and outdoors. When used indoors, the tabi sole 65 can be made of cloth. When used outdoors, the tabi sole 65 is preferably made of cloth or leather with a thickness of 4 to 6 mm and high strength, like a tabi. Alternatively, it may have a multi-layer structure consisting of various layers such as a midsole, midsole, insole, and outsole, like a normal shoe sole, with the outsole being made of synthetic rubber, rubber (crepe rubber), polyurethane, etc.

According to the footwear cover 6 of the third embodiment of the present invention, it is possible to effectively keep the feet warm by fixing and using various reaction-limiting bags exemplified in the first embodiment and the like that store products such as portable heating devices (oxidation-limiting heating elements). According to the footwear cover 6 of the third embodiment of the present invention, the position of the oxidation-limiting heating element such as a portable heating device is fixed by the attachment bag fasteners B8 and B9, so that even if the footwear cover 6 is used while exercising, such as walking, the oxidation-limiting heating element such as a portable heating device will not move inside the footwear cover 6, and it can be used comfortably for a long time.

Fourth Embodiment
The vest 7 according to the fourth embodiment of the present invention is a vest to which various reaction limiting bags are attached, and has a back body 71 having at least a bag-like shape and two belts 73a and 73b as shown in FIG. 16. The belts 73a and 73b are connected at both ends to the upper and lower parts of the back body 71, respectively, and can be worn by both arms (shoulders) when in use, and can be of any shape. The back body 71 has a structure in which at least a part of it is bag-like so that various reaction limiting bags containing products such as portable heating devices (oxidation-limiting heating elements) can be inserted, and openings for inserting various reaction limiting bags can be provided as desired. The vest 7 according to the fourth embodiment, together with the various reaction limiting bags exemplified in the first embodiment, etc., constitutes clothing for keeping the human body warm.

The vest 7 of the fourth embodiment can be worn over clothing such as underwear, and other clothing can be worn over the vest 7 of the fourth embodiment.

With the vest 7 according to the fourth embodiment, it is possible to effectively keep the upper body, particularly the back (back and waist), warm by fastening various reaction-limiting bags containing products such as portable heating devices (oxidation-limiting heating elements). With the vest 7 according to the fourth embodiment, it is possible to easily fasten the oxidation-limiting heating element to the back of the upper body, where it is difficult to attach an oxidation-limiting heating element.

(Modification of the fourth embodiment)
The vest 8 according to the fourth embodiment of the present invention is a vest to which various reaction limiting bags are attached, as in the vest 7 according to the fourth embodiment, and has a back body 81 having at least a part in a bag shape and two belts 83a and 83b, as shown in FIG. 17. The belts 83a and 83b are connected at both ends to the upper and lower parts of the back body 81, respectively, and can be worn by both arms (shoulders) when in use, and the shape does not matter. The back body 81 is generally U-shaped with a wide open neckline on the back, and at least a part of it is bag-shaped. The back body 81 has a structure in which various reaction limiting bags containing products (oxidation rate-limiting heating elements) can be placed in at least a part of the bag-shaped part, and an opening for placing various reaction limiting bags can be provided as desired, for example, the opening 85 in FIG. 17. The vest 8 according to the fourth embodiment of the present invention, together with various reaction limiting bags, constitutes clothing for keeping the human body warm.

The vest 8 according to the modified fourth embodiment can be worn over clothing such as underwear, and other clothing can be worn over the vest 7 according to the fourth embodiment. Furthermore, the vest 8 according to the modified fourth embodiment can be worn as is with the upper part shown in Fig. 17 on top, but it can also be worn with the lower part shown in Fig. 17 on top.

With the vest 8 according to the modified fourth embodiment, it is possible to effectively keep the upper body, particularly the back (back and waist), warm by fixing at least a part of it to various reaction limiting bags containing a product (oxidation-limiting heating element). With the vest 8 according to the modified fourth embodiment, it is possible to easily fix the oxidation-limiting heating element to the back of the upper body, where it is difficult to attach the oxidation-limiting heating element.

The specific structures and specific characteristics of the various reaction limiting bags described in the first and second embodiments, in particular the method for determining the critical open area ratio η ₁ and the critical open area ratio η ₂ , will be described below using Examples 1 to 8. However, the gist of the present invention is not limited to the contents described in Examples 1 to 8.

Four types of reaction limiting bags according to Example 1 of the present invention, A type, B type, C type, and D type, were prepared (hereinafter, in Examples 1 to 3, for convenience, the A type reaction limiting bag is also referred to as "bag A", the B type reaction limiting bag is also referred to as "bag B", the C type reaction limiting bag is also referred to as "bag C", and the D type reaction limiting bag is also referred to as "bag D"). In all of the bags A to D according to Example 1, the hole installation possible area of the first front sheet of the outer bag is 195 mm long x 160 mm wide, the hole installation possible area of the second front sheet of the inner bag is 190 mm long x 110 mm wide, and the first opening and closing tool of the outer bag also serves as the second opening and closing tool of the inner bag. The diameter (equivalent diameter Φ _eff ), pitch (spacing), and number of "pores" meaning oxygen supply holes in each of the bags A to D are as shown in Table 1 below. Note that the first back sheet was also provided with pores similar to the first front sheet, and the second back sheet was also provided with pores similar to the second front sheet. The total area (mm ² ) of the pores, the area where holes can be provided (mm ² ) and the critical open area rate (%) of the outer and inner bags A to D are as shown in FIG. 34 (Table 2).

At room temperature of 23.5°C, a portable heating device (Iris Ohyama Corporation, non-stick warmer, regular size (125mm x 95mm)) was opened, and one used portable heating device was placed in each of bags A to D of Example 1 and left lying down, and the surface temperatures of bags A to D of Example 1 were measured. As control examples, an open portable heating device, a used portable heating device, and a used portable heating device placed in the same type of reaction restriction bag as bag A were prepared. Temperature measurement was started immediately after the sample was left to stand using a digital thermometer (Tanita Corporation, TT-508N).

As shown in Figure 19, bag A according to Example 1 rose from room temperature to about 34°C 3 hours after the start of measurement, and then maintained a temperature of about 36.1°C (average temperature from 24 to 36 hours after measurement), but lost its heat-generating effect about 53 hours later, dropping to about room temperature, and did not rise in temperature thereafter. The maximum temperature of bag A according to Example 1 was 40.7°C, and the average temperature from 2 to 24 hours after measurement was 34.6°C. Figure 19 is a graph showing the time progression of the surface temperature of bag A according to Example 1 containing a portable heating device in use ("A + heating pad" in Figure 19) and the time progression of the surface temperature of the portable heating device itself in use after being opened ("Hand warmer only" in Figure 19). As shown in Figure 19, the control example, "opened portable heating device," rose to a maximum temperature of approximately 57°C in approximately 2 hours, and was confirmed to maintain its heating effect for at least 12 hours, but after 24 hours the temperature had dropped to approximately room temperature, and no further rise in temperature was observed. The other control examples, "used portable heating device" and "used portable heating device stored in the same type of reaction-restricting bag as bag A," were confirmed to have maintained approximately room temperature from the start of measurement until the end of measurement (approximately 144 hours later).

As shown in Figure 20, bag B according to Example 1 rose from room temperature to about 36.5°C 3 hours after the start of measurement, and then maintained a temperature of about 40.6°C (average temperature from 24 to 30 hours after measurement), but lost its heat-generating effect about 36 hours later, and the temperature dropped to about room temperature and did not rise again. The maximum temperature of bag B according to Example 1 was 44.5°C, and the average temperature from 2 to 24 hours after measurement was 37.7°C. Figure 20 is a graph showing the time progression of the surface temperature of bag B according to Example 1 containing a portable heating device in use ("B + heating pad" in Figure 20) and the time progression of the surface temperature of the portable heating device itself in use after being opened ("Hand warmer only" in Figure 20).

As shown in Figure 21, bag C according to Example 1 rose from room temperature to about 28°C 3 hours after the start of measurement, and then maintained 31.0°C (average temperature from 24 hours to 89.5 hours after measurement), but lost its heat-generating effect about 101 hours later, and the temperature dropped to about room temperature, with no further temperature rise. The maximum temperature of bag C according to Example 1 was 34.1°C, and the average temperature from 2 hours to 24 hours after measurement was 40.5°C. Figure 21 is a graph showing the time progression of the surface temperature of bag C according to Example 1 containing a portable heating device in use ("C + heating pad" in Figure 21) and the time progression of the surface temperature of the portable heating device itself in use after being opened ("Hand warmer only" in Figure 21).

As shown in Figure 22, bag D according to Example 1 rose from room temperature to about 32°C 3 hours after the start of measurement, and then maintained a temperature of about 33.4°C (average temperature from 24 to 60 hours after measurement), but lost its heat-generating effect after about 70 hours, dropping to about room temperature, and did not rise in temperature thereafter. The maximum temperature of bag D according to Example 1 was 40.5°C, and the average temperature from 2 to 24 hours after measurement was 33.2°C. Figure 22 is a graph showing the time progression of the surface temperature of bag D according to Example 1 containing a portable heating device in use ("D + heating pad" in Figure 22) and the time progression of the surface temperature of the portable heating device itself in use after being opened ("Hand warmer only" in Figure 22).

Regarding the reaction limiting bag according to Example 2 of the present invention, four reaction limiting bags, bags A to D, were prepared in the same manner as in Example 1. Bags A to D according to Example 2 had the same shape, size, diameter (equivalent diameter Φ _eff ), pitch, and number of oxygen supply holes (pores) as bags A to D according to Example 1.

At room temperature of 23.3°C, a portable heating device (Iris Ohyama Corporation, non-stick warmer, regular size (125mm x 95mm)) was opened, and one used portable heating device was placed inside bags A to D of Example 2 and left to stand on its side, and the surface temperatures of bags A to D of Example 2 were measured. As control examples, an open portable heating device, a used portable heating device, and a used portable heating device placed in a reaction-restricting bag of the same type as bag A were prepared. Temperature measurements were started immediately after the sample was left to stand using a digital thermometer (Tanita Corporation, TT-508N).

As shown in FIG. 23, the temperature of bag A in Example 2 rose from room temperature to about 38°C three hours after the start of the measurement, and then maintained about 37.6°C (average temperature from about 22 hours to 36.5 hours after the measurement), but after about 55 hours the heating effect disappeared and the temperature dropped to about room temperature, and thereafter did not rise. FIG. 23 is a graph showing the time course of the surface temperature of bag A in Example 2 containing a portable heating device in use ("A + heating pad" in FIG. 23) and the time course of the surface temperature of the portable heating device itself in use after being opened ("heat pad only" in FIG. 23). As shown in FIG. 23, the temperature of the control example "portable heating device with the seal opened" rose to a maximum temperature of about 57°C in about three hours, and it was confirmed that the heating effect was maintained for at least 12 hours, but after 24 hours the temperature dropped to about room temperature, and no further temperature rise was confirmed. Regarding the other control examples, a "used portable heating device" and a "used portable heating device stored in the same type of reaction restriction bag as bag A", it was confirmed that the temperature was maintained at approximately room temperature from the start of the measurement until the end of the measurement (approximately 66 hours later).

As shown in Figure 24, bag B in Example 2 rose from room temperature to about 40°C 3 hours after the start of measurement, and then maintained a temperature of about 41.5°C (average temperature for about 22 to 24 hours after measurement), but lost its heat-generating effect after about 38 hours, dropping to about room temperature, and did not rise in temperature thereafter. Note that Figure 24 is a graph showing the time progression of the surface temperature of bag B in Example 2 containing a portable heating device in use ("B + heating pad" in Figure 24) and the time progression of the surface temperature of the portable heating device itself in use after being opened ("Hand warmer only" in Figure 24).

As shown in Figure 25, bag C according to Example 2 rose from room temperature to about 29°C 3 hours after the start of the measurement, and then maintained a temperature of about 30.5°C (average temperature from about 22 hours to 65.5 hours after the measurement was completed), and even about 66 hours after the measurement was completed, it continued to maintain an average temperature of about 31°C, and the heat generating effect had not disappeared. Note that Figure 25 is a graph showing the time progression of the surface temperature of bag C according to Example 2 containing a portable heating device in a used state ("C + heating pad" in Figure 25) and the time progression of the surface temperature of the portable heating device itself in a used state after being opened ("Hand warmer only" in Figure 25).

As shown in Figure 26, bag D of Example 2 rose from room temperature to approximately 32°C 3 hours after the start of measurement, and then maintained a temperature of approximately 34°C (average temperature from approximately 22 hours to 58.5 hours after measurement), after approximately 66 hours the heat generating effect disappeared and the temperature dropped to approximately room temperature. Note that Figure 26 is a graph showing the time progression of the surface temperature of bag D of Example 2 containing a portable heating device in a used state ("D + heating pad" in Figure 26) and the time progression of the surface temperature of the portable heating device itself in a used state after being opened ("Hand warmer only" in Figure 26).

Regarding the reaction limiting bag according to Example 3 of the present invention, four reaction limiting bags, bags A to D, were prepared in the same manner as in Example 1. Bags A to D according to Example 3 had the same shape, size, diameter (equivalent diameter Φ _eff ), pitch, and number of oxygen supply holes as bags A to D according to Example 1.

At room temperature of 23.4°C, a portable heating device (Iris Ohyama Corporation, non-stick warmer regular size (125mm x 95mm)) was opened, and one used portable heating device was placed inside bags A to D of Example 3 and left to stand on its side, and the surface temperatures of bags A to D of Example 3 were measured. As control examples, an open portable heating device, a used portable heating device, and a used portable heating device placed in the same type of reaction restriction bag as bag A were prepared. Temperature measurement was started immediately after the sample was left to stand using a digital thermometer (Tanita Corporation, TT-508N).

As shown in FIG. 27, the temperature of bag A according to Example 3 rose from room temperature to about 38°C three hours after the start of the measurement, and then while maintaining about 38.2°C (average temperature from 10 to 36 hours after the measurement), the heating effect disappeared after about 47.5 hours, the temperature dropped to about room temperature, and thereafter no further temperature rise was observed. FIG. 27 is a graph showing the time course of the surface temperature of bag A according to Example 3 containing a portable heating device in use ("A + heating pad" in FIG. 27) and the time course of the surface temperature of the portable heating device itself in use after being opened ("heat pad only" in FIG. 27). As shown in FIG. 27, the temperature of the control example "opened portable heating device" rose to a maximum temperature of about 56.5°C in about three hours, and it was confirmed that the heating effect was maintained for at least 12 hours, but the temperature dropped to about room temperature after 22 hours, and no further temperature rise was confirmed. Regarding the other control examples, a "used portable heating device" and a "used portable heating device stored in the same type of reaction restriction bag as bag A", it was confirmed that the temperature was maintained at approximately room temperature from the start of the measurement until the end of the measurement (approximately 48 hours later).

As shown in Figure 28, bag B of Example 3 rose from room temperature to about 44°C 3 hours after the start of measurement, and then maintained a temperature of about 42.3°C (average temperature from 10 to 26 hours after measurement), but lost its heat-generating effect after about 32 hours, dropping to about room temperature, and did not rise in temperature thereafter. Figure 28 is a graph showing the time progression of the surface temperature of bag B of Example 3 containing a portable heating device in use ("B + heating pad" in Figure 28) and the time progression of the surface temperature of the portable heating device itself in use after being opened ("Hand warmer only" in Figure 28).

As shown in Figure 29, bag C of Example 3 rose from room temperature to about 30°C 3 hours after the start of measurement, and then maintained a temperature of about 30.2°C (average temperature from 10 to 48 hours after measurement), and even 48 hours after the end of measurement, it continued to maintain an average of about 30°C, and the heat generating effect had not disappeared. Note that Figure 29 is a graph showing the time progression of the surface temperature of bag C of Example 3 containing a portable heating device in a used state ("C + heating pad" in Figure 29) and the time progression of the surface temperature of the portable heating device itself in a used state after being opened ("Hand warmer only" in Figure 29).

As shown in Figure 30, bag D of Example 3 rose from room temperature to about 32°C 3 hours after the start of measurement, and then maintained about 33.0°C (average temperature from 10 to 48 hours after measurement), and even about 48 hours after the end of measurement, it continued to maintain an average of about 33°C, and the heat generating effect had not disappeared. Note that Figure 30 is a graph showing the time progression of the surface temperature of bag D of Example 3 containing a portable heating device that has been used ("D + heating pad" in Figure 30) and the time progression of the surface temperature of the portable heating device itself that has been opened and is in a used state ("Hand warmer only" in Figure 30).

Four types of reaction limiting bags according to Example 4 of the present invention were prepared: E type, F type, G type, and H type (hereinafter, in Example 4, for convenience, the E type reaction limiting bag will be referred to as "bag E", the F type reaction limiting bag will be referred to as "bag F", the G type reaction limiting bag will be referred to as "bag G", and the H type reaction limiting bag will be referred to as "bag H"). In each of the bags E to H according to Example 4, the hole installation possible area of the first front sheet of the outer bag is 200 mm long x 170 mm wide, the hole installation possible area of the second front sheet of the inner bag is 165 mm long x 120 mm wide, the first opening and closing device of the outer bag and the second opening and closing device of the inner bag are provided independently and separately, and the inner bag is fixed to the outer bag near the lower part of the inner bag inside the outer bag. The equivalent diameter Φ _eff and the number of "pores" meaning oxygen supply holes in the bags E to H are as shown in FIG. 34 (Table 2). The total area ( ^mm2 ), area where holes can be installed ( ^mm2 ), and critical open area ratio (%) of the outer bag and inner bag of bags E to H are also as shown in Figure 34 (Table 2). In each of bags E to H, the first back sheet was provided with holes as in the first front sheet, and the second back sheet was provided with holes as in the second front sheet. The holes provided in the outer bags of bags E to H were aligned at equal intervals vertically and horizontally, similar to the multiple holes 31e of the outer bag 11e shown in Figure 31 (a), and _d6 and _d7 , which indicate the pitch (spacing) of the holes, were both 1.5 cm. The holes provided in the inner bags of bags E to H were aligned at equal intervals vertically and horizontally, similar to the multiple holes 32e of the inner bag 21e shown in Figure 31 (b), and _d8 and _d9 , which indicate the pitch (spacing) of the holes, were both 1.5 cm.

At room temperature of 22.5°C, portable heating devices (Iris Ohyama Corporation, non-stick warmer regular size (125mm x 95mm)) were opened, and one used portable heating device was placed in each of bags E to H of Example 4 and left lying down, and the surface temperatures of bags E to H of Example 4 were measured. As a control example, an open portable heating device was prepared. Temperature measurement was started using a non-contact thermometer immediately after the sample was left standing.

As shown in FIG. 35, the temperature of bag E according to Example 4 rose from room temperature to about 34°C 4 hours after the start of the measurement, and then while maintaining about 32.9°C (average temperature from 4 to 35 hours after the measurement), the heat generating effect disappeared after about 55 hours, and the temperature dropped to about room temperature, and thereafter did not rise. The maximum temperature of bag E according to Example 4 was 34.4°C, and the average temperature from 2 to 24 hours after the measurement was 33.3°C. Note that FIG. 35 is a graph showing the time transition of the surface temperature of bag E according to Example 4 containing a portable heating device in a used state ("E + heating pad" in FIG. 35) and the time transition of the surface temperature of the portable heating device itself that has been opened and is in a used state ("heat pad only" in FIG. 35). As shown in FIG. 35, the temperature of the control example "opened portable heating device" rose to a maximum temperature of about 62°C in about 8 hours, and then dropped to about room temperature after about 21 hours, and no further temperature rise was observed.

As shown in Figure 36, bag F according to Example 4 rose from room temperature to about 38.6°C 4 hours after the start of measurement, and then maintained a temperature of about 38.2°C (average temperature from 4 to 18 hours after measurement), but lost its heat-generating effect after about 42 hours, dropping to about room temperature, and did not rise in temperature thereafter. The maximum temperature of bag F according to Example 4 was 39.7°C, and the average temperature from 2 to 24 hours after measurement was 37.3°C. Figure 36 is a graph showing the time progression of the surface temperature of bag F according to Example 4, which contains a portable heating device in use ("F + heating pad" in Figure 36), and the time progression of the surface temperature of the portable heating device itself in use after being opened ("Hand warmer only" in Figure 36).

As shown in Figure 37, the temperature of bag G according to Example 4 rose from room temperature to about 38.6°C 4 hours after the start of measurement, and then remained at about 38.0°C (average temperature from 4 to 20 hours after measurement), but after about 35 hours the heat generating effect disappeared, the temperature dropped to about room temperature, and thereafter did not rise. The maximum temperature of bag G according to Example 4 was 39.0°C, and the average temperature from 2 to 24 hours after measurement was 37.5°C. Figure 37 is a graph showing the time progression of the surface temperature of bag G according to Example 4 containing a portable heating device in use ("G + heating pad" in Figure 37) and the time progression of the surface temperature of the portable heating device itself in use after opening the package ("Hand warmer only" in Figure 37).

As shown in Figure 38, bag H according to Example 4 rose from room temperature to about 43.5°C 4 hours after the start of measurement, and then maintained a temperature of about 41.8°C (average temperature from 2 to 15 hours after measurement), but lost its heat-generating effect after about 33 hours, dropping to about room temperature, and did not rise in temperature thereafter. The maximum temperature of bag H according to Example 4 was 43.5°C, and the average temperature from 2 to 24 hours after measurement was 39.7°C. Figure 38 is a graph showing the time progression of the surface temperature of bag H according to Example 4, which contains a portable heating device in use ("H + heating pad" in Figure 38), and the time progression of the surface temperature of the portable heating device itself in use after being opened ("H + heating pad" in Figure 38).

Five types of reaction limiting bags according to the fifth embodiment of the present invention were prepared: I type, J type, K type, L type, and M type (hereinafter, in the fifth embodiment, for convenience, the I type reaction limiting bag is also referred to as "bag I", the J type reaction limiting bag is also referred to as "bag J", the K type reaction limiting bag is also referred to as "bag K", the L type reaction limiting bag is also referred to as "bag L", and the M type reaction limiting bag is also referred to as "bag M"). In each of the bags I to M according to the fifth embodiment, the hole installation possible area of the first front sheet of the outer bag is 200 mm long x 170 mm wide, the hole installation possible area of the second front sheet of the inner bag is 165 mm long x 120 mm wide, the first opening and closing device of the outer bag and the second opening and closing device of the inner bag are provided independently and separately, and the inner bag is fixed to the outer bag near the lower part of the inner bag inside the outer bag. The equivalent diameter Φ _eff and the number of "pores" meaning the oxygen supply holes in the bags I to M are as shown in FIG. 34 (Table 2). The total area ( ^mm2 ) of the pores, the area where holes can be provided ( ^mm2 ) and the critical open area ratio (%) of the outer bag and inner bag of bags I to M are also as shown in Figure 34 (Table 2). In all of bags I to M, pores were provided in the first back sheet as in the first front sheet, and pores were provided in the second back sheet as in the second front sheet.

For the pores provided in the outer bag in bag I, d ₆ indicating the pitch (spacing) of the multiple pores 31e of the outer bag 11e shown in FIG. 31(a) was 1.5 cm, and d ₇ was 1.0 cm. For the pores provided in the inner bag in bag I, d ₈ indicating the pitch (spacing) of the multiple pores 32e of the inner bag 21e shown in FIG. 31(b) was 1.0 cm, and d ₉ was 1.0 cm. For the pores provided in the outer bag in bag J, d ₆ indicating the pitch (spacing) of the multiple pores 31e of the outer bag 11e shown in FIG. 31(a) was 1.5 cm, and d ₇ was 2.0 cm. For the pores provided in the inner bag in bag J, d ₈ indicating the pitch (spacing) of the multiple pores 32e of the inner bag 21e shown in FIG. 31(b) was 1.0 cm, and d ₉ was 2.0 cm. For the pores provided in the outer bag in bag K, d ₆ indicating the pitch (spacing) of the multiple pores 31e of the outer bag 11e shown in FIG. 31(a) was 1.0 cm, and d ₇ was 3.0 cm. For the pores provided in the inner bag in bag K, d ₈ indicating the pitch (spacing) of the multiple pores 32e of the inner bag 21e shown in FIG. 31(b) was 0.6 cm, and d ₉ was 3.0 cm. For the pores provided in the outer bag in bag L, d ₆ indicating the pitch (spacing) of the multiple pores 31e of the outer bag 11e shown in FIG. 31(a) was 0.6 cm, and d ₇ was 4.0 cm. For the pores provided in the inner bag in bag L, d ₈ indicating the pitch (spacing) of the multiple pores 32e of the inner bag 21e shown in FIG. 31(b) was 0.6 cm, and d ₉ was 4.0 cm. Regarding the pores provided in the outer bag of bag M, d6 indicating the pitch (spacing) of the multiple pores 31e of the outer bag 11e shown in Fig. 31(a) _was 0.6 cm, and _d7 was 5.0 cm. Regarding the pores provided in the inner bag of bag M, _d8 indicating the pitch (spacing) of the multiple pores 32e of the inner bag 21e shown in Fig. 31(b) was 0.6 cm, and _d9 was 5.0 cm.

At room temperature of 24.1°C, a portable heating device (Lotte Hocaron stick-on (130mm x 95mm) manufactured by Lotte Co., Ltd.) was opened, and one used portable heating device was placed in each of bags I to M according to Example 5 and left lying down, and the surface temperatures of bags I to M according to Example 5 were measured. As a control example, an open portable heating device was prepared. Temperature measurement was started immediately after leaving the sample standing using a non-contact thermometer.

As shown in FIG. 39, the temperature of bag I according to Example 5 rose from room temperature to about 36.2°C 4 hours after the start of the measurement, and then while maintaining about 37.2°C (average temperature from 2 to 30 hours after the measurement), the heat generating effect disappeared about 48 hours later, the temperature dropped to about room temperature, and thereafter no temperature rise was observed. The maximum temperature of bag I according to Example 5 was 38.2°C, and the average temperature from 2 to 24 hours after the measurement was 37.2°C. Note that FIG. 39 is a graph showing the time transition of the surface temperature of bag I according to Example 5 containing a portable heating device in a used state ("I + heating pad" in FIG. 39) and the time transition of the surface temperature of the portable heating device itself that has been opened and is in a used state ("heat pad only" in FIG. 39). As shown in FIG. 39, the temperature of the control example "opened portable heating device" rose to a maximum temperature of about 62°C in a single go in about 8 hours, and dropped to about room temperature about 21 hours later, and no subsequent temperature rise was observed.

As shown in Figure 40, bag J according to Example 5 rose from room temperature to about 36.5°C 4 hours after the start of measurement, and then maintained a temperature of about 35.8°C (average temperature from 2 to 31 hours after measurement), but lost its heat-generating effect after about 48 hours, dropping to about room temperature, and did not rise in temperature thereafter. The maximum temperature of bag J according to Example 5 was 37.1°C, and the average temperature from 2 to 24 hours after measurement was 36.1°C. Figure 40 is a graph showing the time progression of the surface temperature of bag J according to Example 5, which contains a portable heating device that has been used ("J + heating pad" in Figure 40), and the time progression of the surface temperature of the portable heating device itself that has been opened and is in a used state ("Hand warmer only" in Figure 40).

As shown in FIG. 41, the temperature of bag K according to Example 5 rose from room temperature to about 35.6°C 4 hours after the start of measurement, and then maintained around 35.7°C (average temperature from 2 to 31 hours after measurement), but after about 48 hours the heat generating effect disappeared, the temperature dropped to about room temperature, and thereafter did not rise. The maximum temperature of bag K according to Example 5 was 37.0°C, and the average temperature from 2 to 24 hours after measurement was 36.0°C. FIG. 41 is a graph showing the time progression of the surface temperature of bag K according to Example 5 containing a portable heating device in use ("K + heating pad" in FIG. 41) and the time progression of the surface temperature of the portable heating device itself in use after opening the package ("Heat pad only" in FIG. 41).

As shown in FIG. 42, the temperature of bag L according to Example 5 rose from room temperature to about 37.5°C 4 hours after the start of measurement, and then maintained around 37.3°C (average temperature from 2 to 21 hours after measurement), but after about 48 hours the heat generating effect disappeared, the temperature dropped to about room temperature, and thereafter did not rise any further. The maximum temperature of bag L according to Example 5 was 38.6°C, and the average temperature from 2 to 24 hours after measurement was 37.0°C. FIG. 42 is a graph showing the time progression of the surface temperature of bag L according to Example 5 containing a portable heating device in use ("L + heating pad" in FIG. 42) and the time progression of the surface temperature of the portable heating device itself in use after being opened ("Hand warmer only" in FIG. 42).

As shown in FIG. 43, the temperature of bag M according to Example 5 rose from room temperature to about 37.4°C 4 hours after the start of measurement, and then maintained around 37.1°C (average temperature from 2 to 28 hours after measurement), but after about 48 hours the heat generating effect disappeared, the temperature dropped to about room temperature, and thereafter did not rise any further. The maximum temperature of bag M according to Example 5 was 38.8°C, and the average temperature from 2 to 24 hours after measurement was 37.1°C. FIG. 43 is a graph showing the time progression of the surface temperature of bag M according to Example 5 containing a portable heating device in use ("M + heating pad" in FIG. 43) and the time progression of the surface temperature of the portable heating device itself in use after being opened ("Hand warmer only" in FIG. 43).

Four types of reaction limiting bags according to Example 6 of the present invention were prepared: N type, O type, P type, and Q type (hereinafter, in Example 6, for convenience, the N type reaction limiting bag will be referred to as "bag N", the O type reaction limiting bag will be referred to as "bag O", the P type reaction limiting bag will be referred to as "bag P", and the Q type reaction limiting bag will be referred to as "bag Q"). In each of the bags N to Q according to Example 6, the hole installation possible area of the first front sheet of the outer bag is 200 mm long x 170 mm wide, the hole installation possible area of the second front sheet of the inner bag is 165 mm long x 120 mm wide, the first opening and closing device of the outer bag and the second opening and closing device of the inner bag are provided independently and separately, and the inner bag is fixed to the outer bag near the lower part of the inner bag inside the outer bag. The equivalent diameter Φ _eff and the number of "pores" meaning oxygen supply holes in the bags N to Q are as shown in FIG. 34 (Table 2). The total area ( ^mm2 ) of the pores, the area ( ^mm2 ) where holes can be installed, and the critical open area ratio (%) of the outer and inner bags N to Q are also as shown in Figure 34 (Table 2). In all of bags N to Q, pores were provided in the first back sheet as in the first front sheet, and pores were provided in the second back sheet as in the second front sheet.

For the pores provided in the outer bag in bag N, d ₆ indicating the pitch (spacing) of the multiple pores 31e of the outer bag 11e shown in FIG. 31(a) was 1.0 cm, and d ₇ was 1.0 cm. For the pores provided in the inner bag in bag N, d ₈ indicating the pitch (spacing) of the multiple pores 32e of the inner bag 21e shown in FIG. 31(b) was 1.0 cm, and d ₉ was 1.0 cm. For the pores provided in the outer bag in bag O, d ₆ indicating the pitch (spacing) of the multiple pores 31e of the outer bag 11e shown in FIG. 31(a) was 2.0 cm, and d ₇ was 2.0 cm. For the pores provided in the inner bag in bag O, d ₈ indicating the pitch (spacing) of the multiple pores 32e of the inner bag 21e shown in FIG. 31(b) was 2.0 cm, and d ₉ was 2.0 cm. For the pores provided in the outer bag of bag P, d ₆ indicating the pitch (spacing) of the multiple pores 31e of the outer bag 11e shown in FIG. 31(a) was 3.0 cm, and d ₇ was 3.0 cm. For the pores provided in the inner bag of bag P, d ₈ indicating the pitch (spacing) of the multiple pores 32e of the inner bag 21e shown in FIG. 31(b) was 3.0 cm, and d ₉ was 3.0 cm. For the pores provided in the outer bag of bag Q, d ₆ indicating the pitch (spacing) of the multiple pores 31e of the outer bag 11e shown in FIG. 31(a) was 4.0 cm, and d ₇ was 4.0 cm. For the pores provided in the inner bag of bag Q, d ₈ indicating the pitch (spacing) of the multiple pores 32e of the inner bag 21e shown in FIG. 31(b) was 4.0 cm, and d ₉ was 4.0 cm.

At room temperature of 23.6°C, a portable heating device (Lotte Co., Ltd., stick-on Lotte Hocaron (130mm x 95mm)) was opened, and one used portable heating device was placed in each of bags N to Q of Example 6 and left lying down, and the surface temperatures of bags N to Q of Example 6 were measured. As a control example, an open portable heating device was prepared. Temperature measurement was started immediately after leaving the sample standing, using a non-contact thermometer.

As shown in FIG. 44, the temperature of the bag N according to Example 6 rose from room temperature to about 42.6°C 4 hours after the start of the measurement, and then while maintaining about 42.4°C (average temperature from 4 to 11 hours after the measurement), the heat generating effect disappeared after about 42 hours, and the temperature dropped to about room temperature, and thereafter did not rise. The maximum temperature of the bag N according to Example 6 was 43.3°C, and the average temperature from 2 to 24 hours after the measurement was 40.3°C. Note that FIG. 44 is a graph showing the time change of the surface temperature of the bag N according to Example 6 containing the portable heating device in use ("N + warmer" in FIG. 44) and the time change of the surface temperature of the portable heating device itself that has been opened and is in use ("warmer only" in FIG. 44). As shown in FIG. 44, the temperature of the control example "opened portable heating device" rose to a maximum temperature of about 62°C in about 8 hours, and dropped to about room temperature after about 21 hours, and no further temperature increase was observed.

As shown in FIG. 45, the temperature of bag O according to Example 6 rose from room temperature to about 34.8°C 4 hours after the start of measurement, and then maintained around 34.1°C (average temperature from 4 to 35 hours after measurement), but after about 59 hours the heat generating effect disappeared, the temperature dropped to about room temperature, and thereafter did not rise any further. The maximum temperature of bag O according to Example 6 was 35.3°C, and the average temperature from 2 to 24 hours after measurement was 34.4°C. FIG. 45 is a graph showing the time progression of the surface temperature of bag O according to Example 6 containing a portable heating device in use ("O + heating pad" in FIG. 45) and the time progression of the surface temperature of the portable heating device itself in use after being opened ("Hand warmer only" in FIG. 45).

As shown in FIG. 46, the temperature of the bag P according to Example 6 rose from room temperature to about 29.1°C 4 hours after the start of the measurement, and then maintained around 29.0°C (average temperature from 4 to 81 hours after the measurement), but after about 116 hours the heat generating effect disappeared, the temperature dropped to about room temperature, and thereafter did not rise any further. The maximum temperature of the bag P according to Example 6 was 30.2°C, and the average temperature from 2 to 24 hours after the measurement was 29.1°C. FIG. 46 is a graph showing the time progression of the surface temperature of the bag P according to Example 6 containing a portable heating device in use ("P + heating pad" in FIG. 46) and the time progression of the surface temperature of the portable heating device itself in use after being opened ("Hand warmer only" in FIG. 46).

As shown in FIG. 47, the temperature of bag Q of Example 6 rose from room temperature to about 27.9°C 4 hours after the start of measurement, and then maintained around 28.4°C (average temperature from 4 to 107 hours after measurement), but after about 155 hours the heat generating effect disappeared and the temperature dropped to about room temperature, and did not rise again. The maximum temperature of bag Q of Example 6 was 29.9°C, and the average temperature from 2 to 24 hours after measurement was 28.1°C. FIG. 47 is a graph showing the time progression of the surface temperature of bag Q of Example 6 containing a portable heating device in use ("Q + heating pad" in FIG. 47) and the time progression of the surface temperature of the portable heating device itself in use after opening the package ("Hand warmer only" in FIG. 47).

Two types of reaction limiting bags according to Example 7 of the present invention, R type and S type, were prepared (hereinafter, in Example 7, for convenience, the R type reaction limiting bag is also referred to as "bag R" and the S type reaction limiting bag is also referred to as "bag S"). In both bags R and S according to Example 7, the hole installation possible area of the first front sheet of the outer bag is 200 mm long x 170 mm wide, the hole installation possible area of the second front sheet of the inner bag is 165 mm long x 120 mm wide, the first opening and closing device of the outer bag and the second opening and closing device of the inner bag are provided independently and separately, and the inner bag is fixed to the outer bag near the lower part of the inner bag inside the outer bag. The equivalent diameter Φ _eff and the number of "pores" meaning oxygen supply holes in bags R and S are as shown in Figure 34 (Table 2). The total area ( ^mm2 ) of the holes, the area ( ^mm2 ) where holes can be provided, and the critical open area ratio (%) of the outer bag and inner bag of bags R and S are also as shown in Figure 34 (Table 2). In both bags R and S, holes were provided in the first back sheet as in the first front sheet, and holes were provided in the second back sheet as in the second front sheet.

The holes provided in the outer bag of bag R were provided so as to be biased toward the four corners of the hole-installable area of the outer bag 11f, as shown in FIG. 32(a). In each of the four corners of the hole-installable area of the outer bag 11f, an isosceles triangular area A where _d10 = _d11 was provided, and holes were provided in the area A. 23 holes were provided in each of the upper left and lower right areas A in FIG. 32(a), and 22 holes were provided in each of the lower left and upper right areas A in FIG. 32(a). _d10 and _d11 of the isosceles triangular area A were each 5.0 cm. The holes provided in the inner bag of bag R were provided so as to be biased toward the four corners of the hole-installable area of the inner bag 21f, as shown in FIG. 32(b). At the four corners of the hole installation area of the inner bag 21f, an isosceles triangular area B where d ₁₂ =d ₁₃ was provided, and a small hole was provided in the area B. 18 small holes were provided in the upper left and lower right areas B in FIG. 32(b), and 17 small holes were provided in the lower left and upper right areas B in FIG. 32(b). d ₁₂ and d ₁₃ of the isosceles triangular area B were each 5.0 cm. The small holes provided in the outer bag of the bag S were provided to the four corners of the hole installation area of the outer bag 11f, as shown in FIG. 32(a), similar to the small holes provided in the outer bag of the bag R. At the four corners of the hole installation area of the outer bag 11f, an isosceles triangular area A where d ₁₀ =d ₁₁ was provided, and a small hole was provided in the area A. In the upper left and lower right regions A in Fig. 32(a), 23 fine holes were provided, and in the lower left and upper right regions A in Fig. 32(a), 22 fine holes were provided. _d10 and _d11 of the isosceles triangular region A were each 5.0 cm. The fine holes provided in the inner bag of bag S were aligned at equal intervals vertically and horizontally, similar to the fine holes 32e of the inner bag 21e shown in Fig. 31(b), similar to the fine holes provided in the inner bag of bag F, and _d8 and _d9 , which indicate the pitch (spacing) of the fine holes, were both 1.5 cm.

At room temperature of 23.6°C, a portable heating device (Lotte Co., Ltd., stick-on Lotte Hocaron (130mm x 95mm)) was opened, and one used portable heating device was placed in bag R and bag S of Example 7, respectively, and left lying down, and the surface temperatures of bags R and S of Example 7 were measured. As a control example, an open portable heating device was prepared. Temperature measurement was started immediately after leaving the sample standing, using a non-contact thermometer.

As shown in FIG. 48, the temperature of the bag R according to Example 7 rose from room temperature to about 30.3°C 4 hours after the start of the measurement, and then while maintaining about 30.1°C (average temperature from 4 to 83 hours after the measurement), the heat generating effect disappeared after about 114 hours, and the temperature dropped to about room temperature, and thereafter did not rise. The maximum temperature of the bag R according to Example 7 was 31.5°C, and the average temperature from 2 to 24 hours after the measurement was 30.2°C. Note that FIG. 48 is a graph showing the time transition of the surface temperature of the bag R according to Example 7 containing a portable heating device in a used state ("R + heating pad" in FIG. 48) and the time transition of the surface temperature of the portable heating device itself that has been opened and is in a used state ("heat pad only" in FIG. 48). As shown in FIG. 48, the temperature of the control example "opened portable heating device" rose to a maximum temperature of about 62°C in a single go in about 8 hours, and dropped to about room temperature after about 21 hours, and no further temperature rise was observed.

As shown in FIG. 49, the temperature of the bag S according to Example 7 rose from room temperature to about 31.4°C 4 hours after the start of the measurement, and then maintained about 31.1°C (average temperature from 4 to 77 hours after the measurement), but after about 114 hours the heat generating effect disappeared, the temperature dropped to about room temperature, and thereafter did not rise. The maximum temperature of the bag S according to Example 7 was 32.3°C, and the average temperature from 2 to 24 hours after the measurement was 31.6°C. FIG. 49 is a graph showing the time progression of the surface temperature of the bag S according to Example 7 containing a portable heating device in use ("S + heating pad" in FIG. 49) and the time progression of the surface temperature of the portable heating device itself in use after being opened ("Hand warmer only" in FIG. 49).

Three types of reaction limiting bags according to Example 8 of the present invention were prepared: T type, U type, and W type (hereinafter, in Example 8, for convenience, the T type reaction limiting bag will be referred to as "bag T", the U type reaction limiting bag will be referred to as "bag U", and the W type reaction limiting bag will be referred to as "bag W"). In all of the bags T to W according to Example 8, the hole installation possible area of the first front sheet of the outer bag is 200 mm long x 170 mm wide, the hole installation possible area of the second front sheet of the inner bag is 165 mm long x 120 mm wide, the first opening and closing device of the outer bag and the second opening and closing device of the inner bag are provided independently and separately, and the inner bag is fixed to the outer bag near the lower part of the inner bag inside the outer bag. However, bag T only had the outer bag, and bag U only had the inner bag. The equivalent diameter Φ _eff and the number of "pores" meaning oxygen supply holes in bags T to W are as shown in FIG. 34 (Table 2). The total area ( ^mm2 ) of the pores, the area where holes can be provided ( ^mm2 ) and the critical open area ratio (%) of the outer and inner bags T to W are also as shown in Figure 34 (Table 2). In all of the bags T to W, pores were provided in the first back sheet as in the first front sheet, and pores were provided in the second back sheet as in the second front sheet.

The outer bag in bag T was the same as bag F in Example 4. The inner bag in bag U was the same as bag F in Example 4. The pores in the outer bag in bag W were 1.5 cm in pitch (spacing) between the multiple pores 31e of the outer bag 11e shown in FIG. 31(a), d ₆ was 1.5 cm, and d ₇ was 0.7 cm, and were provided so as to be offset to the left from the center on the paper surface of FIG. 31(a). That is, the pores were concentrated in the left half of the outer bag of bag W, and no pores were provided in the right half. The pores in the inner bag in bag W were 1.5 cm in pitch (spacing) between the multiple pores 32e of the inner bag 21e shown in FIG. 31(b), d ₈ was 1.5 cm, and d ₉ was 0.7 cm, and were provided so as to be offset to the left from the center on the paper surface of FIG. 31(b). That is, the pores are concentrated in the left half of the inner bag of the bag W, and no pores are provided in the right half.

At room temperature of 22.5°C, portable heating devices (Iris Ohyama Corporation, non-stick warmer regular size (125mm x 95mm)) were opened, and one used portable heating device was placed in each of bags T to W of Example 8 and left lying down, and the surface temperatures of bags T to W of Example 8 were measured. As a control example, an open portable heating device was prepared. Temperature measurement was started using a non-contact thermometer immediately after the sample was left to stand.

As shown in FIG. 50, the temperature of the bag T according to Example 8 rose from room temperature to about 43.6°C 4 hours after the start of the measurement, and then while maintaining about 43.0°C (average temperature from 4 to 15 hours after the measurement), the heat generating effect disappeared after about 33 hours, and the temperature dropped to about room temperature, and thereafter did not rise. The maximum temperature of the bag T according to Example 8 was 43.6°C, and the average temperature from 2 to 24 hours after the measurement was 39.8°C. Note that FIG. 50 is a graph showing the time transition of the surface temperature of the bag T according to Example 8 containing a portable heating device in a used state ("T + heating pad" in FIG. 50) and the time transition of the surface temperature of the portable heating device itself that has been opened and is in a used state ("heat pad only" in FIG. 50). As shown in FIG. 50, the temperature of the control example "opened portable heating device" rose to a maximum temperature of about 62°C in about 8 hours, and then dropped to about room temperature after about 21 hours, and no further temperature rise was observed.

As shown in FIG. 51, bag U according to Example 8 rose from room temperature to about 47.7°C 4 hours after the start of measurement, and then maintained a temperature of about 47.1°C (average temperature from 4 to 15 hours after measurement), but lost its heat-generating effect after about 31 hours, dropping to about room temperature, and did not rise in temperature thereafter. The maximum temperature of bag U according to Example 8 was 47.7°C, and the average temperature from 2 to 24 hours after measurement was 44.5°C. FIG. 51 is a graph showing the time progression of the surface temperature of bag U according to Example 8, which contains a portable heating device that has been used ("U + heating pad" in FIG. 51), and the time progression of the surface temperature of the portable heating device itself that has been opened and is in use ("heat pad only" in FIG. 51).

As shown in FIG. 52, the bag W according to Example 8 rose from room temperature to about 31.9°C 4 hours after the start of measurement, and then maintained a temperature of about 31.0°C (average temperature from 4 to 26 hours after measurement), but lost its heat-generating effect after about 46 hours, dropping to about room temperature, and did not rise in temperature thereafter. The maximum temperature of the bag W according to Example 8 was 32.5°C, and the average temperature from 2 to 24 hours after measurement was 31.2°C. FIG. 52 is a graph showing the time progression of the surface temperature of the bag W according to Example 8 containing a portable heating device in use ("W + heating pad" in FIG. 52) and the time progression of the surface temperature of the portable heating device itself in use after being opened ("Hand warmer only" in FIG. 52).

Other Embodiments
As described above, the present invention has been described by the embodiment, but the description and drawings forming a part of this disclosure should not be understood as limiting the present invention. Various alternative embodiments, examples and operating techniques will become apparent to those skilled in the art from this disclosure.

For example, various reaction limiting bags can be used by storing a product (oxidation-rate-limiting heating element) in a torso guard 9 as shown in FIG. 18. As shown in FIG. 18, the torso guard 9 has a bag-shaped pouch portion 93, a belt 95 connected to the upper part of the pouch portion 93, and buttons 97a and strings 97b fixed to both ends of the belt 95. The pouch portion 93 has an opening through which various reaction limiting bags containing a product (oxidation-rate-limiting heating element) are placed, and the belt 95 is wrapped around any part of the human body such as the waist, and the string 97b is fastened to the button 97a to secure the torso guard 9 to the human body. It is difficult to secure various reaction limiting bags to any part of the human body by themselves, but by using the torso guard 9 as shown in FIG. 18, various reaction limiting bags can be comfortably secured to the human body for a long time, and the heat retention effect of the oxidation-rate-limiting heating element can be obtained.

In addition, the edges of the multiple oxygen supply holes (pores) of various reaction limiting bags can be shaped to be convex outward relative to the outer bag and inner bag, as shown in FIG. 33. By having the edges of the multiple oxygen supply holes convex outward relative to the outer bag and inner bag, the multiple oxygen supply holes can be easily caught on clothing when used on the human body, preventing the various reaction limiting bags from falling off and making it possible to obtain a more comfortable feel when used. The shape of the edges of the multiple oxygen supply holes convex outward relative to the outer bag and inner bag is not limited to a shape in which the entire periphery of the oxygen supply holes is convex outward relative to the outer bag and inner bag as shown in FIG. 33, but also includes a shape in which a part of the edge is convex outward relative to the outer bag and inner bag. A part of the edge of the multiple oxygen supply holes may have a notch, and a part of the edge around the notch may be convex outward relative to the outer bag and inner bag. When the edges of the multiple oxygen supply holes (pores) are convex outward relative to the outer bag and inner bag, the height of the convex part is preferably about 0.1 to 1.5 mm, more preferably about 0.1 to 0.5 mm. The number of oxygen supply holes (pores) having outwardly convex edges may be any ratio to the total number of oxygen supply holes (pores), but is preferably 5 to 100% of the total, and is preferably 30 to 100% of the total in order to make it easier for the bag to be caught on clothing. The oxygen supply holes (pores) having outwardly convex edges may be provided only in either the first front sheet or the first back sheet of the outer bag. The oxygen supply holes (pores) having outwardly convex edges do not need to be provided in the inner bag.

As such, the present invention naturally includes various embodiments not described herein. Therefore, the technical scope of the present invention is determined only by the invention-specific matters relating to the scope of the claims that are appropriate from the above description.

1a, 1b, 1c, 2... reaction restriction bag 4... pocket (attached bag)
6...footwear cover 7, 8...body garment 9...body guard 11a, 11b, 11c, 11d, 11e, 11f...outer pouch 13a, 13b, 13c, 13d...first opening and closing device _15a1 , _15b1 , _15c1 , _15d1 ...first front joining piece _15a2 , _15b2 , _15c2 , _15d2 ...first back joining piece 21a, 21b, 21c, 21d, 21e, 21f...inner pouch 23a, 23b, 23c...second opening and closing device _25a1 , _25b1 , _25c1 ...second front joining piece _25a2 , _25b2 , _25c2 ...second back joining piece 31a, 31b, 31c, 31d, 31e, 32e...oxygen supply hole 41a, 41d...outer heat storage space 43a, 43d...inner heat storage space _51a1 , _51a2 ...inner bag fixing part 61...shaft B1, B2, B3, B4, B5...shaft fastener B8, B9...attaching bag fastener 65...tabi sole 67...attaching bag main body 67a, 67b...suspension part 71, 81...back body 73a, 73b, 83a, 83b...belt 85...opening 91a, 91b, 91c, 91d, 91e, 91f, 91g...protective part 93...pouch part 95...belt 97a...button 97b...string 100...oxidation rate-limiting heating element

Claims (5)

A reaction-limiting bag for use in the above-mentioned manner of use to limit the oxidation reaction of an oxidation-limiting heating element, the oxidation-limiting heating element including oxidation-limiting heating particles contained in a bag of a breathable packaging material, when the oxidation-limiting heating element is officially released on the market as a product and a consumer uses the product as a heating element, the reaction-limiting bag being:
an air layer surrounding the oxidation-rate-limiting heating element serves as an inner heat storage space, and an openable and closable inner bag accommodates the oxidation-rate-limiting heating element through the inner heat storage space ;
an air layer surrounding the inner bag serves as an outer heat storage space, and an outer bag that can be opened and closed to store the inner bag through the outer heat storage space ;
the outer bag has a first bag shape having a first front sheet and a first back sheet opposed to the first front sheet as main members and having a first opening at an upper end, and has a first opening/closing device near the first opening,
the inner bag has a second front sheet and a second back sheet opposed to the second front sheet as main members, is in the form of a second bag having a second opening at an upper end, has a second opening/closing device near the second opening, and is disposed inside the outer bag;
A reaction limiting bag characterized in that a plurality of oxygen supply holes are provided in each of the first and second front sheets and the first and second back sheets, and each of the plurality of oxygen supply holes is a through hole having an equivalent diameter of 1.6 to 3.0 mm in terms of a circular area. When a first hole installable area is defined as an area from the first opening/closing device to a bottom of the outer bag, a total area of the plurality of oxygen supply holes provided in the first hole installable area is 0.11 to 0.83% of an area of the first hole installable area,
When a second hole installable area is defined as an area from the second opening/closing device to a bottom of the inner bag, a total area of the plurality of oxygen supply holes provided in the second hole installable area is 0.19 to 1.11% of an area of the second hole installable area,
2. The reaction limiting bag according to claim 1, wherein the area in which the first hole can be installed is less than 400 ^cm2 . The reaction limiting bag according to claim 1 or 2, characterized in that the edges of the multiple oxygen supply holes are convex outward relative to the first bag shape. When an oxidation-rate-limiting heating element, which is an oxidation-rate-limiting heating element containing oxidation-rate-limiting heating particles in a bag of a breathable packaging material, is officially released on the market as a product and a consumer uses the product as a heating element, the clothing is used in the above-mentioned manner of use to limit the oxidation reaction of the oxidation-rate-limiting heating element,
a reaction limiting bag having a double bag structure including an inner bag that can be opened and closed and stores the oxidation-limiting heating element through the inner heat storage space , and an outer bag that can be opened and closed and stores the inner bag through the outer heat storage space, and an air layer that surrounds the inner bag is an outer heat storage space, and
a footwear cover having a cylindrical portion that surrounds the ankle of a human body and has the reaction limiting bag fixed inside;
the outer bag has a first bag shape having a first front sheet and a first back sheet opposed to the first front sheet as main members and having a first opening at an upper end, and has a first opening/closing device near the first opening,
the inner bag has a second front sheet and a second back sheet opposed to the second front sheet as main members, is in the form of a second bag having a second opening at an upper end, has a second opening/closing device near the second opening, and is disposed inside the outer bag;
a plurality of oxygen supply holes are provided in each of the first and second front sheets and the first and second back sheets, each of the plurality of oxygen supply holes being a through hole having an equivalent diameter of 1.6 to 3.0 mm when converted into a circle area. When an oxidation-rate-limiting heating element, which is an oxidation-rate-limiting heating element containing oxidation-rate-limiting heating particles in a bag of a breathable packaging material, is officially released on the market as a product and a consumer uses the product as a heating element, the clothing is used in the above-mentioned manner of use to limit the oxidation reaction of the oxidation-rate-limiting heating element,
a reaction limiting bag having a double bag structure including an inner bag that can be opened and closed and that stores the oxidation-limiting heating element through the inner heat storage space , and an outer bag that can be opened and closed and that stores the inner bag through the outer heat storage space, and an air layer that surrounds the inner bag is an outer heat storage space, and
and a vest having a bag-shaped back body with the reaction limiting bag disposed therein;
the outer bag has a first bag shape having a first front sheet and a first back sheet opposed to the first front sheet as main members and having a first opening at an upper end, and has a first opening/closing device near the first opening,
the inner bag has a second front sheet and a second back sheet opposed to the second front sheet as main members, is in the form of a second bag having a second opening at an upper end, has a second opening/closing device near the second opening, and is disposed inside the outer bag;
a plurality of oxygen supply holes are provided in each of the first and second front sheets and the first and second back sheets, each of the plurality of oxygen supply holes being a through hole having an equivalent diameter of 1.6 to 3.0 mm when converted into a circle area.

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