TWI807060B - heating element - Google Patents

Abstract

A heating element that can be worn on the body is provided. The heating element is provided with a bag formed by overlapping two sheets and joining their outer peripheral edges throughout the entire circumference; a heating material enclosed in the bag; and a cover provided on the side of the second sheet of the bag. The cover is provided by forming a space between the bag and a part of the body into which a part of the body can be inserted, and the cover is air-impermeable.

Description

heating element

The present invention relates to a heating element capable of heating a part of the body, such as a disposable body warmer.

As a heating element used to warm the body, there is known a disposable body warmer in the past. The above-mentioned disposable body warmer is a powdery exothermic composition that generates heat by contacting with air and is enclosed in a flat bag with air permeability (for example, refer to Patent Document 1). Disposable body warmers are frequently used because they are excellent in portability, safety, and simplicity, and are inexpensive.

Among such heating elements, it cannot be attached to clothing, etc. The so-called non-adhesive disposable body heater is used to warm hands by holding it, or to warm other parts of the body by holding the object and touching a suitable part of the body.

[Prior Art Literature] [Patent Document]

[Patent Document 1] Japanese Patent Laid-Open No. H05-208031

[Outline of Invention]

The above-mentioned non-adhesive disposable body warmer must, for example, be warmed for fingers. You have to keep holding it with your hands, and you have to hold it with your hands and keep touching your toes in order to keep your toes warm. Therefore, there is room for improvement in that you can't keep warm while doing other tasks with your hands.

The present invention was made with the above-mentioned problems in mind, and aims to provide a heat generating element that can be worn on the body.

The heat generating element of the present invention is characterized by comprising: a bag body formed by joining the outer peripheral edges of the surface layer and the back layer over the entire circumference; a heat generating material enclosed in the bag body; and a cover provided on at least one of the surface layer and the back layer of the bag body so as to form a space between the bag body and the bag body, and the cover cover is air-impermeable.

In the heating element of the present invention, the cover is provided on one of the surface layer and the inner layer of the bag, and the layer of the bag provided with the cover preferably has lower air permeability than the layer without the cover. In this case, the layer of the aforementioned bag body provided with the aforementioned cover is more preferably non-breathable. Furthermore, it is more preferable that the inside can be turned inside out through the opening for inserting a part of the body into the space, so that the cover is located on the layer side of the bag body where the cover is not provided. Moreover, the cover is more preferably formed in a size capable of covering the entire surface of the layer of the bag on which the cover is provided.

In addition, in the heating element of the present invention, the cover is provided on one of the surface layer and the inner layer of the bag body, and the cover cover is preferably capable of being folded and overlapped to the layer side of the bag body that is not provided with the cover cover. exist In this case, the cover is more preferably formed in a size capable of covering the entire surface of the surface layer and the back layer of the bag body.

According to the heating element of the present invention, the user inserts a part of the body such as a finger into the space provided in the cover of the bag, so that the bag can be kept on a part of the user's body, so the bag can not be touched by hand or the like. Part of the body. Therefore, a part of the body can still be warmed while doing operations such as reading a book and operating a mobile phone.

On top of this, the space in the cover of the heating element is air-impermeable to improve thermal insulation, so it can effectively warm a part of the body such as fingers inserted into the space.

1: heating element

2: Heating material

3: Bag body

4: cover sleeve

5: space

6: opening

7: opening

30: 1st sheet

31: the second sheet

32: Joint

40: Joint

L: Length

D: width

d1: width

d2: width

Fig. 1 is a perspective view of a heating element.

Fig. 2 is a bottom view of the heating element.

Fig. 3 is a cross-sectional view along line A-A of Fig. 1 .

Fig. 4 is a perspective view of the heating element in use.

Fig. 5 is a perspective view of a state in which the heating element is turned inside out.

Fig. 6 is a cross-sectional view of a heat generating element according to a modification.

Fig. 7 is a sectional view of a heat generating element according to a modified example.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. 1 to 3 show a heating element 1 according to an embodiment of the present invention. The heating element 1 is equipped with: heating material 2; bag body 3, which is flat and sealed with heating material 2; A part (finger in this embodiment) is provided on at least one side of the bag body 3 in the form of a space 5 .

The exothermic material 2 is suitable, for example, an exothermic composition that generates heat by contact with air. As long as the exothermic composition is something that generates heat by contacting with air, for example, a known composition used in a disposable body warmer can be used, which contains oxidizable metal, activated carbon, water retaining agent (wood powder, vermiculite, diatomaceous earth, perlite, silica gel, alumina, water-absorbing resin, etc.), metal salt (salt, etc.) and water, and each contains an appropriate content. The oxidizable metal is a metal that generates heat in an oxidation reaction, and examples thereof include powders and fibers of one or more kinds selected from iron, aluminum, plumbous, manganese, magnesium, and calcium. Among them, iron powder is preferable from the viewpoints of handleability, safety, manufacturing cost, preservation and safety. In terms of iron powder, for example, one or more selected from reduced iron powder and atomized iron powder can be mentioned.

In addition, the heat generating material 2 may also be other than a material that generates heat by contact with air, for example, a material that generates heat by receiving microwave radiation from a microwave oven or the like (for example, ceramic powder such as ferrite, etc.).

The bag body 3 has a surface layer and a back layer joined over the entire circumference of the outer peripheral edge, and has a sealing space for the heat generating material 2 between the surface layer and the back layer. In this embodiment, the bag body 3 is composed of two sheet materials 30 and 31 having a rectangular shape in planar view. The two sheets 30, 31 are superimposed, and the outer periphery is joined with a predetermined width over the entire periphery with a known adhesive, or joined by thermal welding of resin films (heat sealing), etc., thereby forming a bag shape with a sealing space for the heat-generating material 2 inside. The width d1 of the joining portion 32 of the two sheets 30, 31 of the bag body 3 is not particularly limited, but It is preferably about 1 mm to 20 mm.

The two sheets 30 and 31 have flexibility as if the heating element 1 is kneaded by hand to make it soft. Moreover, among the two sheets 30, 31, the sheet (first sheet) 30 constituting one of the surface layers of the bag body 3 has air permeability.

For the first sheet 30, a resin film is preferably used in consideration of strength, durability against heat generated by the heat generating material 2, and the like. The resin used in the resin film is not particularly limited, but is preferably a thermoplastic resin. Examples of thermoplastic resins include polyethylene, polypropylene, polyester, polyamide, polyurethane, polystyrene, polyvinyl alcohol, polyvinyl chloride, polyvinylidene chloride, polycarbonate, ethylene/vinyl acetate copolymer, etc. Among them, polyethylene, polypropylene, and ethylene/vinyl acetate copolymer are preferred. These resins may be used alone or in combination of two or more.

In the resin film used for the first sheet 30, in order to ensure air permeability, a plurality of perforations (not shown) are formed, and through the plurality of perforations, the air communicates inside and outside the bag body 3 and makes the heat-generating material 2 generate heat by touching the heat-generating material 2. The perforation may be formed in the entire area of the resin film, or may be formed in a part. Also, the size of the perforation is not particularly limited as long as it can prevent the exothermic material 2 from leaking out of the bag body 3, but it is preferably about 0.1 mm to 0.3 mm. The shape and quantity of the perforations are not particularly limited, and the size, shape and quantity of the perforations are appropriately set in consideration of the air permeability of the bag body 3 and the temperature sensed by the heating element 1 during use. As a method of forming perforations in the resin film, conventionally known methods can be used.

Also, if it is considered that the touch feeling of the heating element 1 is made good, then the first sheet 30 is further made of air-permeable woven or non-woven fabric, and It is preferably constituted by a laminate obtained by laminating a woven or non-woven fabric on a resin film. In this case, the resin film is disposed on the inner side of the heat generating material 2 side, and the woven or non-woven fabric is disposed on the outer side.

In terms of fiber materials of air-permeable woven or non-woven fabrics, examples can be given: synthetic fibers such as nylon, vinylon, polyester, acrylic, polyethylene, polypropylene, polyvinyl chloride (PVC), polybutylene terephthalate, etc.; semi-synthetic fibers such as rayon, acetate, etc.; natural fibers such as cotton, hemp, silk, paper, etc.; mixed fibers of these fibers, etc. Among them, nylon, polyester, polypropylene, etc. are exemplified as the fiber material from the viewpoint of making the touch feel good, and nylon and polyester are more preferable. These fiber materials may be used alone or in combination of two or more. The basis weight of the woven or nonwoven fabric is not particularly limited as long as it can prevent the exothermic material 2 from leaking out of the bag body 3, but it is preferably about 20 g/m ² or more and 70 g/m ² or less.

The other sheet (second sheet) 31 constituting the inner layer of the bag body 3, like the above-mentioned first sheet 30, can be constituted by a single resin film or a laminate formed by laminating a woven or non-woven fabric on a resin film. When the second sheet 31 is formed by laminating a woven or non-woven fabric on a resin film, the resin film is placed on the inner side of the heat generating material 2 side, and the woven or non-woven fabric is placed on the outer side. As the resin used for the resin film and the fibrous material of the woven or non-woven fabric, the same ones as those exemplified for the first sheet 30 are preferable.

The 2nd sheet material 31 can have air permeability also can make non-air permeability, but under the situation of having air permeability, the air permeability should be higher than that of the first sheet material. 30 low. Since the second sheet 31 has no air permeability or has air permeability but the air permeability is lower than that of the first sheet 30, not only can the supply of air from the second sheet 31 side to the heat generating material 2 be suppressed, but also the water vapor generated with the heat generation of the heat generating material 2 can be prevented from intruding into the space 5 between the second sheet 31 and the cover 4. The air permeability of the second sheet 31 can be controlled by adjusting the number of perforations formed on the resin film constituting the second sheet 31 for ventilation, and the second sheet 31 can be made air-impermeable by not forming perforations.

The thickness of the two sheets 30, 31 constituting the bag body 3 is not particularly limited, but the smaller the thickness, the softer the heating element 1 can be and the better the hand feel is. On the other hand, if the thickness is too small, the strength of the bag body 3 will be reduced. Therefore, it is preferably between 0.1mm and 2.0mm.

In addition, in this embodiment, the bag body 3 is composed of two sheets 30, 31, but it is also possible to form a bag shape by folding one sheet in half and joining the outer peripheral edges with a predetermined width over the entire circumference. In this case, the air permeability of each area can be controlled by adjusting the number of perforations formed in the resin film in each area of one sheet.

The cover 4 is made of an air-impermeable sheet. In terms of the sheet constituting the cover 4, as long as it touches the skin softly and is air-impermeable, for example, like the first sheet 30 and the second sheet 31 of the above-mentioned bag body 3, it can be constituted by a single resin film or a laminate formed by laminating woven or non-woven fabrics on a resin film. When the sheet constituting the cover 4 is a laminate formed by laminating woven or non-woven fabrics on a resin film, the resin film is placed on the inside of the bag body 3 side, and the woven or non-woven fabric is placed on the outside. For resins used in resin films, and woven fabrics or not As for the fiber material of the woven fabric, the same ones as those exemplified for the first sheet 30 are preferable. The sheet constituting the cover 4 is made air-impermeable by not forming perforations for ventilation in the resin film.

In addition, the air-impermeability in the present invention means that the sheet material constituting the bag body 3 and the cover 4 does not have holes for allowing air to pass through (such as forming the above-mentioned perforations on the resin film or the fine holes formed in the material itself), for example, even if the resin film itself is slightly air-permeable, it is also included in the air-impermeability.

In this embodiment, the cover 4 is provided on the side of the second sheet 31 of the bag body 3 . The cover cover 4 is to be bonded to at least a part of the second sheet 31 of the bag body 3 with a known adhesive, or to be bonded by a pseudo-bonding of a resin film and a non-woven fabric (or woven cloth), thereby being installed on the bag body 3. In this embodiment, the cover 4 is the second sheet 31 bonded to the bag body 3 so that the opening 6 facing the space 5 between the bag body 3 is previously formed. The opening 6 is used to insert a part of the body (fingers in this embodiment) into the space 5 between the cover 4 and the bag body 3. As shown in FIG.

The cover 4 is preferably joined with a predetermined width by a part of the outer periphery of the cover 4 and the second sheet 31, that is, the outer periphery of the cover 4 and the second sheet 31 is joined with a predetermined width except the part of the opening 6, thereby being installed on the bag body 3. Thereby, the space 5 between the cover 4 and the bag body 3 is airtight because the cover 4 except the opening 6 is airtight, so the thermal insulation in the space 5 can be improved.

If the size of the opening 6 is capable of accommodating the body of the insertion space 5 A part of the body is the size of a finger in this embodiment, and is not particularly limited, but it is preferably designed to be able to turn the inside of the heating element 1 through the opening 6, so that the cover 4 is positioned at the first sheet 30 side of the bag body 3 with air permeability.

In this embodiment, the cover 4 has a rectangular shape in plan view having the same shape and size as the bag body 3 so as to cover the entire area of one side (the surface of the second sheet 31 ) of the bag body 3 . Moreover, the outer peripheral edge of the cover 4 is joined to the outer peripheral edge of the second sheet material 31 with a pair of short sides and three sides of one long side, and the other long side forms an opening 6 towards the space 5, and is designed so that there is no part not joined to the second sheet material 31 outside the opening 6. In this embodiment, since the space 5 between the cover 4 and the bag body 3 is airtight because the cover 4 except the opening 6 is airtight, the thermal insulation in the space 5 can be improved. Moreover, as shown in FIG. 5 , the inside of the heat generating element 1 can be turned inside out through the opening 6 .

In addition, in this embodiment, although the sheet prepared separately from the bag body 3 is attached to the bag body 3 as the cover 4, the bag body 3 with the cover 4 can also be constituted by a single sheet. Specifically, one sheet is divided into three parts in the longitudinal direction, and the area of the back layer of the bag body 3, the area of the surface layer of the bag body 3, and the area of the cover 4 are sequentially defined from one end. By adjusting the number of perforations formed in the resin film in each area of one sheet, the air permeability of each area can be controlled. In addition, after the area of the inner layer of the bag body 3 is folded and superimposed on the area of the surface layer of the bag body 3 and the outer peripheral edge is joined with a predetermined width throughout the entire circumference, the area of the cover 4 is folded and superimposed on the area of the inner layer of the bag body 3 and a part of the outer peripheral edge is joined with a predetermined width. A bag body 3 with a cover 4 is formed.

The bonding strength between the cover 4 and the second sheet 31 of the bag body 3 is not particularly limited, but is preferably designed to be smaller than the bonding strength of the two sheets 30 and 31 of the bag body 3 . This prevents the second sheet 31 of the bag 3 joined to the cover 4 from being peeled off from the first sheet 30 along with the peeling of the cover 4 when the cover 4 is applied with a force in the direction of peeling off the bag 3 and the cover 4 is peeled off from the bag 3 during use. In this way, when the cover 4 is peeled off, the two sheets 30, 31 at the joint portion 32 of the bag body 3 can remain bonded without peeling off, so that the bag body 3 will not be unsealed suddenly, and leakage of the heat generating material 2 in the bag body 3 can be prevented.

The bonding strength between the cover 4 and the second sheet 31 of the bag body 3 is not particularly limited if it is smaller than the bonding strength of the two sheets 30, 31 of the bag body 3, but is preferably less than 10N/15mm width, more preferably 8.0N/15mm width or less. When the bonding strength between the cover 4 and the second sheet 31 of the bag body 3 is 8.0 N/15 mm width or less, the cover 4 can be peeled off from the second sheet 31 by peeling the cover 4 from the bag 3 with some force. Therefore, even if the opening 6 communicating with the space 5 between the cover 4 and the bag body 3 is initially formed small, the size of the opening 6 can be greatly adjusted by slowly peeling the cover 4 from the second sheet 31 of the bag body 3 in response to a part of the inserted body, in this embodiment, the size or number of fingers. Thereby, since the size of the opening 6 is made to the extent that a part of the body inserted into the space 5 enters, the opening 6 can be prevented from being excessively expanded, so heat can be suppressed from flowing out from the opening 6 to the outside of the space 5, and the thermal insulation in the space 5 can be effectively improved. Therefore, a part of the body inserted into the space 5 can be warmed more favorably. Also, the opening 6 is not too large relative to the part of the inserted body, whereby the cover 4 can follow the body well movement, thus improving the fit to the body. In addition, in order to prevent the cover 4 from being easily peeled off from the second sheet 31, the bonding strength between the cover 4 and the second sheet 31 of the bag body 3 is preferably 6.0 N/15 mm width or more.

On the other hand, in order to firmly join the two sheets 30, 31 at the junction of the bag body 3 without peeling off, the bonding strength of the two sheets 30, 31 of the bag body 3 is preferably 10 N/15 mm width or more, more preferably 12 N/15 mm width or more.

The measurement method of the above-mentioned joint strength is as follows. First, as shown by the two-dot chain line in FIG. 1, three booklet-shaped samples with a width D: 15 mm and a length L: 50 mm are cut out from the bag body 3 with the cover 4 so as to include the junction 32, and then the peel strength (N/15 mm width) of the two sheets 30 and 31 of each sample is measured with a push-pull force meter (manufactured by imada Co., Ltd., PS) at a tensile speed of 300 mm/min and a grasping interval of 20 mm. The bonding strength of the two sheets 30 and 31 of the bag body 3 is shown.

Also, as shown in the chain line of two dots in FIG. 1 , three booklet-shaped samples of width D: 15 mm and length L: 50 mm were cut out from the bag body 3 with the cover 4 so as to include the junction of the cover 4 and the second sheet 31, and the peel strength (N/15 mm wide) of the cover 4 and the second sheet 31 of each sample was measured with a push-pull force meter (manufactured by imada Co., Ltd., PS) with a tensile speed of 300 mm/min and a grasping interval of 20 mm. ), and average the measured values to calculate the bonding strength between the cover 4 and the second sheet 31 of the bag body 3 .

The width d2 of the joint portion 40 between the cover 4 and the second sheet 31 of the bag body 3 is not particularly limited, but is preferably equal to or smaller than the width d1 of the joint portion 32 of the two sheets 30, 31 of the bag body 3 . In this way, it is possible to prevent When the cover 4 is peeled off from the bag body 3, the inner second sheet 31 of the joining portion 32 can be pulled apart by the cover 4 along with the peeling of the cover 4, so that the second sheet 31 is damaged or the bonding strength between the second sheet 31 and the first sheet 30 is reduced.

According to the heating element 1 having the above configuration, as shown in FIG. 4 , the user inserts a part of the body, such as a finger, into the space 5 in the cover 4 provided on one side (the second sheet 31) of the bag body 3, thereby holding the bag body 3 on the finger of the user, so that the bag body 3 can be closely attached to the finger even if the bag body 3 is not held by hand. Therefore, it is still possible to warm a part of the body while doing tasks such as reading a book or operating a mobile phone. In addition to this, it is also possible to warm this part by touching the heating element 1 held on the hand to other parts of the body.

Also, the space 5 inside the cover 4 of the heat generating element 1 is airtight due to the impermeability of the cover 4 to improve heat retention. Therefore, it is possible to effectively warm a part of the body such as fingers inserted into the space 5 .

Also, after the use of the heating element 1, when the use is temporarily interrupted, as shown in FIG. 5, the inside of the heating element 1 is turned out through the opening 6 so that the cover 4 is arranged on the first sheet 30 side of the bag body 3, whereby the heat-generating material 2 in the bag body 3 can be covered with the air-impermeable cover 4 and the second sheet material 31 with low or no air permeability. Thereby, air can be prevented from hitting the heat generating material 2 as much as possible when not in use. The heat generating element 1 of this embodiment generates heat by contacting the heat generating material 2 with the air, so it keeps generating heat while the heat generating material 2 is continuously in contact with the air, and does not generate heat after a predetermined period of time. Therefore, the heating of the heating material 2 is temporarily stopped in such a way that the air does not come into contact with the heating material 2 as much as possible when not in use, thereby being able to maintain a part of the heating. heat retention time, and can make the heating element 1 last.

As mentioned above, although the embodiment of this invention was demonstrated, this invention is not limited to the said embodiment, As long as it does not deviate from the summary of this invention, various changes are possible.

For example, in the above-described embodiment, the cover 4 is joined to the outer periphery of the second sheet 31 with a pair of short sides and three sides of one long side in the outer periphery, but it can also be joined to the outer periphery of the second sheet 31 with a pair of long sides and three sides of one short side.

Also, among the above-mentioned embodiments, the cover 4 is joined to the outer periphery of the second sheet 31 on three sides of the outer periphery, but as shown in FIG.

Also, in the above embodiment, the cover 4 is joined to the second sheet 31 of the bag body 3 by forming the openings 6 and 7 facing the space 5 between the bag body 3 in advance, but it is also possible to form the openings 6 and 7 by, for example, bonding the outer peripheral edges of the cover cover 4 and the second sheet 31 to each other throughout the entire circumference, even if the openings 6 and 7 are not formed at the beginning.

Also, in the above-mentioned embodiment, the outer peripheral edges of the cover 4 and the second sheet 31 are joined to each other, but it is not necessarily necessary to join the outer peripheral edges to each other, and the outer peripheral edge of the cover 4 may be joined to a region inside the inner peripheral edge of the second sheet 31, or a part of the region inside the outer peripheral edge of the cover 4 may be joined to the second sheet 31.

Also, in the above-mentioned embodiment, the cover 4 is the same shape and size as the bag body 3, but if the cover cover 4 is to form a space 5 between the bag body 3 and the outer peripheral edge except the part of the opening 6 is joined to the outer peripheral edge of the second sheet 31 of the bag body 3, then the shape and size of the bag body 3 can also be different. For example, as shown in FIG. 7 , the cover 4 may be formed larger than the bag body 3 , and the cover 4 may be folded back to cover the surface of the bag body 3 on the first sheet 30 side. In this way, the heat-generating material 2 in the bag body 3 can be covered with the air-impermeable cover 4, so that the heat-generating material 2 is temporarily stopped by keeping the air from touching the heat-generating material 2 when not in use, thereby maintaining a part of its heat retention time and making the heat-generating element 1 last. In addition, the cover 4 can be simply extended to be longer than the bag body 3, but as shown in FIG. 7, the protruding part of the cover cover 4 than the bag body 3 can be configured as a double structure and the two side edges are joined to each other and the folded front end edge is joined to the outer peripheral edge (long side) of the bag body 3 to form a pocket shape and can accommodate a part of the body.

In addition, in the above embodiment, the cover 4 is provided only on the second sheet 31 side of the bag body 3 , but the cover 4 may be provided on the first sheet 30 side.

In addition, in the above-mentioned embodiment, although the bag body 3 has a rectangular shape in plan view, it may also have a square shape, a polygonal shape, a circular shape, an elliptical shape, and other various shapes.

Also, in the above-mentioned embodiment, although the heating element 1 is designed to be inserted into the user's finger in the space 5 in the cover 4, it can also be designed to be inserted into other parts of the body (such as toes or head, etc.).

1‧‧‧Heater

3‧‧‧bag body

30‧‧‧1st sheet

31‧‧‧Second sheet

4‧‧‧Cover

40‧‧‧junction

5‧‧‧Space

6‧‧‧opening

L‧‧‧Length

D‧‧‧Width

Claims (8)

A heat generating element comprising: a bag body formed by joining outer peripheral edges of a surface layer and a back layer over the entire circumference; a heat generating material enclosed in the bag body; and a cover provided on one of the surface layer and the back layer of the bag body so as to form a space between the bag body and the back layer, the cover cover being air-impermeable, and the cover cover being configured such that an opening for inserting a part of the body into the space is closer to a joining portion of the cover cover than with a layer provided with the cover cover. The side part is folded and overlapped to the layer side of the aforementioned bag body that is not provided with the aforementioned cover sleeve. The heating element according to claim 1, wherein the air permeability of the layer of the bag with the cover is lower than that of the layer without the cover. The heating element according to claim 2, wherein the layer of the bag body provided with the cover is non-breathable. The heating element according to any one of claims 1 to 3, which can be turned inside out through the opening for inserting a part of the body into the space, so that the cover is located on the side of the bag without the cover. The heating element according to claim 4, wherein the cover is formed to be large enough to cover the entire surface of the layer of the bag on which the cover is provided. Small. The heating element according to any one of claims 1 to 3, wherein the cover is formed in a size capable of covering the entire surface of the surface layer and the inner layer of the bag body. The heating element according to claim 4, wherein the cover is formed in a size capable of covering the entire surface of the surface layer and the inner layer of the bag body. The heating element according to claim 5, wherein the cover is formed in a size capable of covering the entire surface of the surface layer and the inner layer of the bag body.