TW202108097A - Heat generator - Google Patents

Abstract

Provided is a heat generator wherein the maximum temperature of a heat generation surface is lowered and high local temperature increases can be prevented. A heat generator is provided with: a bag body formed in a bag shape with a front-side sheet part and a back-side sheet part; and a heat generation material sealed in the bag body. The bag body has a connection part in which the front-side sheet part and the back-side sheet part are joined. The connection part comprises: a rim section formed along at least a potion of the outer circumference of the bag body; and a protrusion protruding from the rim section toward the heat generation material.

Description

heating stuff

The present invention relates to heating elements.

Background technique

Patent Document 1 discloses the previous heating element. The heating element described in Patent Document 1 includes: a heating composition (heating material) which generates heat by contact with air; and a storage bag (bag body) which contains the heating composition. The storage bag is formed into a bag shape by laminating two sheets and sealing the outer peripheral edge portion. Advanced technical literature Patent literature

[Patent Document 1] Japanese Patent Application Publication No. 2018-376

Summary of the invention The problem to be solved by the invention

However, in the heating element described in Patent Document 1, if the temperature distribution of the heating surface is observed, the temperature at the center portion tends to be higher when viewed from the front, and it is not good that a localized high temperature rise occurs on the heating surface. In response to the localized high temperature rise on the heating surface of the heating element, various countermeasures have been taken in the past, but better countermeasures are expected.

The present invention was completed in view of the above circumstances, and its object is to provide a heating element that can lower the maximum temperature of the heating surface and suppress localized high temperature rise. Means to solve the problem

A heating element according to an aspect of the present invention includes a bag body formed in a bag shape by a front side sheet portion and a back side sheet portion; and a heating material enclosed in the bag body. The bag body has a joining part formed by joining the front-side sheet part and the back-side sheet part. The joint portion includes: an edge portion formed along at least a part of the outer circumference of the bag body; and a protrusion portion that protrudes from the edge portion toward the heating material side.

In addition, in the heating element, the protrusion dimension of the protrusion is preferably 15% relative to the dimension between the edge of the protrusion corresponding to the position of the protrusion in the direction in which the protrusion protrudes, and the portion opposite to the protrusion. Above and below 35%.

In addition, in the heating element, in the direction in which the protruding portion protrudes, the dimension between the protruding portion and the portion facing the protruding portion is preferably relative to the inner dimension of the bag body corresponding to the protruding portion More than 30% and less than 70%.

In addition, the heating element should preferably include a plurality of protrusions, and the protrusion directions of the aforementioned plurality of protrusions should be along a straight line.

In addition, it is preferable that the heating element is formed on the outer edge of the bag body with a recessed portion at a position corresponding to the protruding portion.

Furthermore, it is preferable that the heating element is that the bag body is formed in a rectangular shape in front view with a width and a length, the edge portion includes a portion formed along the length direction of the bag body, and the protrusion is formed at the length of the bag body The central part of the direction. Invention effect

The heating element of the above aspect of the present invention has the advantages of lowering the maximum temperature of the heating surface and suppressing localized high temperature rise.

The form used to implement the invention

(1) Implementation form (1.1) Summary The heating element 1 of the present embodiment can locally give a warming effect to the body. As shown in FIGS. 1 and 2, the heating element 1 of this embodiment includes a bag body 2 formed in a bag shape, and a heating material 4 enclosed in the bag body 2.

The bag body 2 is formed in a bag shape by the front side sheet part 21 and the back side sheet part 22, and has the junction part 3 in at least one part. The joining part 3 is a part which joins the front-side sheet part 21 and the back-side sheet part 22. The junction part 3 of this embodiment includes an edge part 31 and a protruding part 32.

As shown in FIG. 1, the edge part 31 is formed along at least a part of the outer periphery of the bag body 2 (in this embodiment, the whole length of the outer periphery of the bag body 2). The protruding portion 32 protrudes from the edge portion 31 toward the heat generating material 4 side.

The heating element 1 of the present embodiment can maintain the area of the high-temperature region on the heating surface equal to or more than that of the heating element without the protrusion 32 and lower the maximum temperature. Therefore, the heating element 1 of the present embodiment can lower the maximum temperature of the heating surface and suppress a localized high temperature rise.

In the present invention, the "high-temperature region" refers to a temperature region above (the highest temperature-5°C) and below the highest temperature in the temperature region of the heating surface.

(1.2)Detailed Hereinafter, the heating element 1 of this embodiment will be described in detail. The heating element 1 of this embodiment is suitable for warming the waist or back. The heating element 1 of the present embodiment is a heating element that uses reaction heat generated when an oxidation reaction occurs as a heat source, such as a disposable heating pad. The heating element 1 is housed in an airtight outer bag (not shown) that does not allow air to pass, for example, before use.

The heating element 1 of this embodiment has a large size. In the present invention, the term "large size" refers to the area of the heating surface when the heating surface is substantially rectangular when viewed from the front, the width dimension is 90 mm or more and the length dimension is 120 mm or more, and when the heating surface is a shape other than the substantially rectangular shape, it refers to the area of the heating surface It is 10800mm ² or more. In the heating element 1 of this embodiment, the heating surface is substantially rectangular, the width dimension is 116 mm, and the length dimension is 181 mm (the longest part is 174 mm, and the shortest part is 174 mm). In the present invention, "width" refers to a side shorter than "length".

In addition, in the present invention, the “heat-generating surface” refers to the portion of the bag body 2 surrounded by the edge 31 on the surface of the bag body 2. In the heating element 1 of the present embodiment, the front-side sheet portion 21 and the back-side sheet portion 22 have heating surfaces, respectively, and the front view and the rear view of the heating element 1 are the directions in which the heating surface is viewed from the front.

The heating element 1 may also have a general size, and is not limited to a large size. In addition, the heating element 1 can also be held by the user, attached to or wrapped around the body, etc., to be used on any part of the body such as hands, feet, abdomen, soles of feet, shoulders, and buttocks.

(1.2.1) Heating material The heat-generating material 4 is a material that can generate heat, and in this embodiment is a powder material that can generate heat by contact with air. The heat generating material 4 is enclosed in the bag body 2.

The heat generating material 4 includes, for example, an oxidizable metal, activated carbon, carbon black, a water-retaining agent, a metal salt (for example, common salt), and water. The oxidizable metal is a metal that emits the heat of oxidation reaction. For example, one or two or more powders or fibers selected from iron, aluminum, zinc, manganese, magnesium, and calcium can be cited. Among them, it is determined by operability, safety, From the viewpoint of manufacturing cost, preservation and stability, iron powder is preferred. Regarding the iron powder, one kind or two or more kinds selected from reduced iron powder and atomized iron powder can be exemplified. As for the water-retaining agent, for example, wood powder, vermiculite, diatomaceous earth, polished iron, silica gel, alumina, water-absorbing resin, etc. can be cited. Regarding the heating material 4, the composition used in the previous disposable warm pack can be directly used, and there is no particular limitation.

Regarding the heat-generating material 4, materials other than materials that can generate heat by contact with air may also be used. Regarding the heat generating material 4, for example, a material that generates heat by being irradiated with microwaves by a microwave oven or the like (for example, ceramic powder such as ferrite magnets, red beans, etc.).

(1.2.2) Bag body The bag body 2 has a storage space in which the heat generating material 4 is stored. The bag body 2 of this embodiment is formed in a flat shape as shown in FIG. 2, and includes a front side sheet portion 21 and a back side sheet portion 22. The bag body 2 joins the front side sheet part 21 and the back side sheet part 22 by the joining part 3, thereby forming a storage space inside.

As shown in FIG. 1, the bag body 2 of this embodiment is formed in the front view substantially rectangular shape which has a width and a length. However, the bag body 2 may be formed into, for example, a square shape in front view, a triangular shape in front view, a polygonal shape in front view of pentagon or more, a round shape in front view, an elliptical shape in front view, etc. The shape is not limited.

(1.2.2.1) Front side sheet part The front-side sheet portion 21 is a sheet-like portion forming one surface of the bag body 2. As shown in FIG. 2, the front-side sheet portion 21 of the present embodiment is composed of one sheet. The front side sheet part 21 of this embodiment has flexibility. Thereby, the user can rub the heating element 1 with his hands or make the heating element 1 fit along the body.

From the viewpoints of strength and durability against heat generated by the heat generating material 4, it is preferable to use a resin film for the front side sheet portion 21 of the present embodiment. Regarding the resin used for the resin film, a thermoplastic resin is preferable. As for the thermoplastic resin, for example, polyethylene, polypropylene, polyester, polyamide, polyurethane, polystyrene, polyvinyl alcohol, polyvinyl chloride, polyvinylidene chloride, polycarbonate, Ethylene-vinyl acetate copolymer, etc. These resins can be used alone or in combination of two or more kinds.

In addition, from the viewpoint of making the skin feel of the heating element 1 good, the front-side sheet portion 21 is preferably provided with a woven fabric or a non-woven fabric on the outer side of the resin film.

Regarding the fiber materials of woven or non-woven fabrics, for example, natural fibers such as cotton, linen, silk, and paper, semi-synthetic fibers such as rayon and acetate, nylon, vinylon, polyester, acrylic, polyethylene, etc. Synthetic fibers such as polypropylene, polyvinyl chloride, polybutylene terephthalate, and mixed fibers of these fibers, etc. Among them, from the viewpoint of making the skin feel good, the fiber material is preferably nylon, polyester, polypropylene, and more preferably nylon, polyester, and the like. These fiber materials can be used alone or in combination of two or more kinds. The weight per unit area of the woven fabric or non-woven fabric is not particularly limited as long as it can prevent the heat generating material 4 from leaking out of the bag body 2, and examples thereof include 20 g/m ² or more and 70 g/m ² or less.

However, the front-side sheet portion 21 does not need to be a laminate of a resin film and a woven fabric or a non-woven fabric, and may be composed of a separate resin film, or may be composed of a separate woven fabric or non-woven fabric.

The front side sheet part 21 of this embodiment has air permeability. In the front-side sheet portion 21 of this embodiment, the front-side sheet portion 21 has a plurality of holes because the resin film is a porous resin film or a resin film formed with a plurality of holes (not shown). Therefore, the front-side sheet portion 21 can ventilate the inside and outside of the bag body 2 through a plurality of holes. A plurality of holes may be formed evenly on the entire surface of the front-side sheet portion 21, or may be formed densely in a part. Moreover, the diameter of each hole should just be a size which can suppress the leakage of the heat-generating material 4 through the hole, for example, 0.1 μm or more and 30 μm or less can be exemplified. In addition, the shape and number of holes are not particularly limited. Since the sensory temperature of the heating element 1 changes according to the air permeability of the bag 2, the size, shape and number of holes can be appropriately set in consideration of the sensory temperature of the heating element 1 and the degree of restraint of the heating material 4 from leaking.

In addition, regarding the front-side sheet portion 21, when the non-woven fabric is used alone, a plurality of holes may not be formed.

(1.2.2.2) Back side sheet part The back side sheet portion 22 is a sheet-like portion formed on the opposite side of the front side sheet portion 21 in the bag body 2. The back side sheet part 22 of this embodiment is comprised by one sheet. The back side sheet part 22 of this embodiment has flexibility similarly to the front side sheet part 21. As shown in FIG.

It is preferable to use a resin film for the back side sheet portion 22 in the same manner as the front side sheet portion 21. However, the back side sheet portion 22 does not need to have the same structure and the same material as the front side sheet portion 21. Regarding the back side sheet portion 22, the same as the front side sheet portion 21 is preferably composed of a laminate of a resin film and a woven fabric or a non-woven fabric, but it is not limited to this, and may be composed of a separate resin film or a separate woven fabric. Fabric or non-woven fabric composition.

The back side sheet part 22 of this embodiment has air permeability. The back-side sheet portion 22 of this embodiment is the same as the front-side sheet portion 21. The back-side sheet portion 22 is a porous resin film or a resin film formed with a plurality of holes (not shown). It has a plurality of holes. However, the back side sheet part 22 does not necessarily have air permeability, and may be non-air permeability.

The thickness of each of the front side sheet part 21 and the back side sheet part 22 is not specifically limited, For example, 0.1 mm or more and 2.0 mm or less are suitable. Thereby, the heating element 1 can be made soft and easy to hold in the hand, and on the other hand, a certain strength can be ensured.

(1.2.2.3) Joint The joining part 3 is a part which joins the front-side sheet part 21 and the back-side sheet part 22. The joining part 3 of this embodiment is comprised by welding (heat sealing) a part of the front side sheet part 21 and a part of the back side sheet part 22. As shown in FIG. However, the joining part 3 may not be welded, for example, it may be realized by bonding, sewing, crimping, etc., or may be realized by a combination thereof. As shown in FIG. 1, the joining portion 3 includes an edge portion 31 and a plurality of (here, two) protrusion portions 32.

The rim portion 31 is a portion formed along the outer circumference of the bag body 2 in the joining portion 3. The edge portion 31 of this embodiment is continuous across the entire length of the outer circumference of the bag body 2. The width dimension of the edge portion 31 is not particularly limited, and for example, it is preferably 1 mm or more and 10 mm or less, and preferably 3 mm or more and 7 mm or less. The edge part 31 of this embodiment is formed in substantially the same width dimension over the full length.

The edge portion 31 of this embodiment includes a pair of long side portions 311 formed along the longitudinal direction, and a pair of short side portions 312 and four corner portions 313 formed along the width direction. The pair of long side portions 311 are formed substantially linearly and parallel to each other in this embodiment. The pair of short side portions 312 are curved convexly outward in the longitudinal direction in this embodiment, but they may be formed in a linear shape. Each corner portion 313 connects an end of a long side portion 311 and an end of a short side portion 312. The corner 313 of this embodiment is formed in a rounded shape, but for example, it may be formed in a C-chamfered shape, an obtuse-angled shape, an acute-angled shape, or the like.

The protruding portion 32 is a portion of the joining portion 3 that protrudes from the edge portion 31 toward the heat generating material 4 side. In the heating element 1 of this embodiment, the protrusion 32 protrudes from the edge 31, so that the maximum temperature of the heating surface can be lowered and localized high temperature rise can be suppressed. In addition, according to the protrusion 32, the heat generating material 4 is difficult to move in the longitudinal direction in the inside of the bag body 2, and is not easily deflected to one side in the longitudinal direction.

The protrusion 32 of this embodiment extends along the width direction of the bag body 2. The width dimension H1 of the protruding portion 32 is substantially the same as the width dimension of the edge portion 31 in this embodiment.

From the viewpoint of lowering the maximum temperature of the heating surface and suppressing localized high temperature rise, the protrusion size of the protrusion 32 (hereinafter referred to as the protrusion size L1) should be set as follows. That is, the protrusion dimension L1 of the protrusion 32 relative to the inner dimension D2 of the position corresponding to the protrusion 32 of the bag body 2 in the direction in which the protrusion 32 protrudes is preferably set to 5% or more, preferably 10% or more and 40% Or less, more preferably 15% or more and 35% or less.

Here, in the present invention, the "inner dimension D2 of the position corresponding to the protrusion 32 of the bag body 2 in the direction in which the protrusion 32 protrudes" refers to the position where the protrusion 32 is formed, assuming that there is no protrusion 32 The size of the time from the position of the edge 31 to the position of the opposite edge 31. Furthermore, the so-called "projection size L1 of the projecting portion 32" herein refers to the projecting size L1 of one projecting portion 32. Therefore, when the plurality of protrusions 32 are located on the straight line T1, "the protrusion size L1 of the protrusion 32" refers to the protrusion size of one of the protrusions 32.

On the other hand, from the viewpoint of ensuring the heating effect of the heating element 1, in the direction in which the protrusion 32 protrudes, the dimension D1 between the protrusion 32 and the portion facing the protrusion 32 becomes the following condition , Set the protrusion size L1 of the protrusion 32. That is, the size D1 is set to preferably 20% or more and 95% or less, more preferably 25% or more and 85% or less, and still more preferably 30% or more and 70% or less with respect to the inner size D2.

Here, the base point of "inner dimension D2" and "projection dimension L1" is the center point in the width direction of the projection 32 on the inner periphery of the edge 31 (actually the extension of the inner periphery of the storage space). The "extended line forming the inner periphery of the storage space" does not actually appear because the protrusion 32 and the edge 31 are integrated. It is an imaginary line that smoothly connects the inner periphery of the edge 31 on both sides of the protrusion 32 .

In addition, the "projection size L1" is the maximum value of a line parallel to the inner periphery of the edge 31 on which the projection 32 is formed, and having an intersection with the projection 32, and the distance between the inner periphery. In addition, the so-called "direction in which the protrusion 32 protrudes" is a direction orthogonal to the inner peripheral edge when the inner peripheral edge of the edge 31 where the protrusion 32 is formed is linear, and the edge where the protrusion 32 is formed When the inner peripheral edge of the portion 31 is curved, it is the direction perpendicular to the tangent to the inner peripheral edge of the center point of the width direction of the protrusion 32 on the inner peripheral edge of the edge portion 31. In this embodiment, since the inner peripheral edge of the edge 31 on which the protrusion 32 is formed is linear, the "direction in which the protrusion 32 protrudes" is parallel to the width direction of the heating element 1.

In addition, in this embodiment, the pair of protrusions 32 are located on the straight line T1. The dimension D1 is the dimension obtained by subtracting the total protrusion dimension L1 of the protrusion 32 (that is, L1+L1) from the inner dimension D2. At this time, D1=D2-(L1+L1).

In contrast, for example, as shown in FIG. 3 (variation example 1) or FIG. 4 (variation example 2-1), when there is only one protrusion 32 on the straight line T1, the dimension D1 is the protrusion of the protrusion 32 minus the inner dimension D2 The size of size L1. At this time, D1=D2-L1. Furthermore, when drawing a plurality of line segments between the protruding part 32 and the part opposite to the protruding part 32 in the direction in which the protruding part 32 protrudes, the so-called "dimension D1" here is the shortest line segment among the plurality of line segments size of.

However, the protrusion dimension L1 and the width dimension H1 of the protrusion 32 are not particularly limited. In addition, the protruding direction of the protruding portion 32 may not be along the width direction of the bag body 2, and may be inclined with respect to the width direction, for example.

The protruding part 32 of this embodiment is formed at the central part of the bag body 2 in the longitudinal direction. Here, the "central part" refers to the position in the longitudinal direction of the bag 2 where the distance from the end is 1/2 of the length of the bag 2 (set this as the center). A portion having a certain range in the length direction. The fixed range may be a range of 1/3 with respect to the length of the bag 2 as an example. Therefore, in the present invention, as long as the protrusion 32 is formed with at least a part of the protrusion 32 in the certain range, it is in the category of "formed at the center of the longitudinal direction of the bag 2".

The pair of protrusions 32 are located on the straight line T1 in this embodiment. That is, the protrusion direction of the plurality of protrusions 32 is along the straight line T1. In the heating element 1 of this embodiment, since the heating material 4 does not exist in the portion where the protrusion 32 is located, the position of the protrusion 32 is easily bent along the straight line T1.

As shown in FIG. 1, a plurality of recesses 33 (here, two) recessed from the outer edge of the bag 2 are formed in the joint 3. The recess 33 in this embodiment is a notch formed at a position corresponding to the protrusion 32. The recess 33 may be formed when the sheet is formed, or may be cut after the bag body 2 is formed. The periphery of the recess 33 is formed in an arc shape in this embodiment, but it may be formed in an acute angle or an obtuse angle, and it is not particularly limited. In the heating element 1 of the present embodiment, by forming the recess 33 at the position corresponding to the protrusion 32, the bonding strength of the joint 3 can be maintained and it is easy to bend at the position corresponding to the protrusion 32.

(2) Effect As described above, the protrusion 32 of the heating element 1 of the present embodiment protrudes from the edge 31 formed along at least a part of the outer periphery of the bag 2 toward the heating material 4 side. According to this, the maximum temperature of the heating surface in the heating element 1 can be lowered, and the localized high temperature rise can be suppressed.

In addition, the heat generating material 4 enclosed in the bag body 2 is prevented from moving by the protrusion 32. Therefore, in the heating element 1 of the present embodiment, the heating material 4 is unlikely to deviate from the inside of the bag 2 to one side. In addition, the heating element 1 of this embodiment is easy to bend along the portion of the protrusion 32, and when the user touches the heating element 1 to the body, the heating element 1 can be deformed along the body.

In addition, in the heating element 1 of the present embodiment, the protrusion dimension L1 of the protrusion 32 is the inner dimension D2 of the bag body 2 corresponding to the protrusion 32 in the direction in which the protrusion 32 protrudes, which is 15% or more and 35% the following. Therefore, the maximum temperature of the heating surface of the heating element 1 can be lowered more effectively, the localized high temperature rise can be suppressed, and the heating material 4 can be prevented from deviating to one side in the inside of the bag 2.

In addition, in the heating element 1 of the present embodiment, in the direction in which the protrusion 32 protrudes, the dimension D1 between the protrusion 32 and the portion facing the protrusion 32 is relative to the dimension D1 of the bag body 2 and the protrusion The inner dimension D2 at the corresponding position of 32 is 30% or more and 70% or less. Therefore, according to this aspect, a certain warming effect in the heating element 1 can be ensured.

In addition, the heating element 1 of the present embodiment includes a plurality of protrusions 32, and the protrusion direction of the plurality of protrusions 32 is along a straight line T1. Therefore, the heating element 1 is easy to bend along the straight line T1, and when the user touches the heating element 1 to the body, the heating element 1 can be further easily deformed along the body.

In addition, in the heating element 1 of the present embodiment, a recessed portion is formed at a position corresponding to the protruding portion 32 in the outer edge of the bag body 2. Therefore, the heating element 1 is easier to bend along the straight line T1, and when the user touches the heating element 1 to the body, the heating element 1 can be further easily deformed along the body.

In addition, in the heating element 1 of the present embodiment, the bag body 2 is formed in a rectangular shape having a width and a length in a front view, and the protrusion 32 is formed at the center portion of the bag body 2 in the longitudinal direction. Therefore, in the heating element 1 of this embodiment, the maximum temperature of the heating surface can be lowered and the uniformity of the temperature distribution can be improved. In addition, the maximum temperature of the heating surface can be lowered while suppressing the average temperature drop.

In particular, a large-sized heating element like the heating element 1 of the present embodiment is likely to generate a localized high temperature rise compared with a general-sized heating element, and the heating material 4 is easily deviated to one side inside the bag 2. In contrast, in the heating element 1 of the present embodiment, since the joint 3 has the protruding portion 32, even if the size is large, the maximum temperature of the heating surface can be effectively reduced, localized high temperature rise can be suppressed, and the heating material 4 can be suppressed. It is biased to one side in the inside of the bag body 2.

(3) Variations The above-mentioned embodiment is only one of various embodiments of the present invention. As long as the embodiment can achieve the purpose of the invention, various changes can be made according to the design and the like. Hereinafter, a modified example of the embodiment will be described. The modified examples described below can be appropriately combined and applied.

(3.1) Variations on the number of protrusions (variation example 1) The heating element 1 of the above-mentioned embodiment has two protrusions 32, but as shown in FIG. 3, it may have only one protrusion 32. As shown in FIG. In the heating element 1 of Modification 1, the protruding portion 32 only protrudes from one long side portion 311 of the pair of long side portions 311.

The protrusion dimension L1 of the protrusion 32 is preferably set to 5% or more, more preferably 10% or more and 40% or less, and still more preferably 15% or more and 35% or less relative to the inner dimension D2. In addition, the protrusion size of the protrusion 32 is set such that the dimension D1 relative to the inner dimension D2 is preferably 20% or more and 95% or less, preferably 25% or more and 85% or less, more preferably 30% or more and 70% or less. L1.

The heating element 1 of the modified example 1 can also exhibit the same effects as the above-mentioned embodiment.

(3.2) Modification of the arrangement of the protrusion (modification 2) (3.2.1) Variation 2-1 In the heating element 1 of the above embodiment, two protrusions 32 are formed on a straight line T1. However, as shown in FIG. 4, the two protrusions 32 may be staggered from each other when viewed in the protrusion direction of the protrusions 32. In the heating element 1 of the modified example 2-1, a pair of protrusions 32 are formed to be shifted from each other in the longitudinal direction of the heating element 1.

The protrusion dimension L1 of the protrusion 32 is the same as the heating element 1 of Modification 1, and is set to preferably 5% or more, more preferably 10% or more and 40% or less, still more preferably 15% or more and 35 relative to the inner dimension D2. %the following. In addition, the protrusion size of the protrusion 32 is set such that the dimension D1 relative to the inner dimension D2 is preferably 20% or more and 95% or less, preferably 25% or more and 85% or less, more preferably 30% or more and 70% or less. L1.

The heating element 1 of the modified example 2-1 can also exert the same effect as the above-mentioned embodiment.

(3.2.2) Variation 2-2 The heating element 1 of the above-mentioned embodiment is formed on a pair of long side portions 311 with protruding portions 32 respectively. Although not shown in particular, it may be formed on one of the four corner portions 313 (refer to FIG. 1) that form a diagonal. The diagonal portion 313 is formed with a protrusion 32.

In the heating element 1 of Modification 2-2, the protruding portion 32 protrudes from the edge portion 31 along the diagonal line that is a straight line. A pair of protrusions 32 are located on a diagonal line.

The heating element 1 in the modified example 2-2 can also exhibit the same effects as the above-mentioned embodiment.

Furthermore, the protruding portion 32 can also protrude from the short side portion 312 of the edge portion 31.

(3.3) Examples of changes to the outer shape of the bag (variation 3) (3.3.1) Variation 3-1 The heating element 1 of the above-mentioned embodiment is formed in a substantially rectangular shape in a front view, but as shown in FIG. 5(A), it may be formed in an oblong shape in a front view. Here, the “oblong” in the present invention refers to a circle extending in one direction, and includes, for example, an oval, an ellipse, an oval shape, and a rectangle with rounded corners.

In the heating element 1 of the modified example 3-1, the edge portion 31 is formed in a curved shape. The protruding portion 32 protrudes from the edge portion 31 toward the heat generating material 4 side. The protrusion dimension L1 of the protrusion 32 is preferably set to 5% or more, more preferably 10% or more and 40% or less, and still more preferably 15% or more and 35% or less relative to the inner dimension D2. In addition, the protrusion size of the protrusion 32 is set such that the dimension D1 relative to the inner dimension D2 is preferably 20% or more and 95% or less, preferably 25% or more and 85% or less, more preferably 30% or more and 70% or less. L1.

Here, the base point of "inner dimension D2" and "projection dimension L1" refers to the center point in the width direction of the projection 32 on the inner periphery of the edge 31 (actually the extension of the inner periphery of the storage space). The "extended line forming the inner periphery of the storage space" does not actually appear because the protrusion 32 and the edge 31 are integrated. It is an imaginary line that smoothly connects the inner periphery of the edge 31 on both sides of the protrusion 32 .

Therefore, the heating element 1 of the modified example 3-1 can also exert the same effect as the above-mentioned embodiment.

(3.3.2) Variation 3-2 The heating element 1 of the above-mentioned embodiment is formed in a substantially rectangular shape in a front view, but as shown in FIG. 5(B), it may be formed in a D shape in a front view. The shape of the heating element 1 of the above-mentioned embodiment is point-symmetrical, but the shape of the heating element 1 of the modified example 3-2 is not point-symmetrical, but line-symmetrical.

In the heating element 1 of the modified example 3-2, the edge portion 31 includes an arc portion 314 and three straight portions 315. The protruding portion 32 protrudes toward the heat generating material 4 side from the boundary portion between the circular arc portion 314 and the one straight portion 315. The protrusion dimension L1 of the protrusion 32 is preferably set to 5% or more, more preferably 10% or more and 40% or less, and still more preferably 15% or more and 35% or less relative to the inner dimension D2. In addition, the protrusion size of the protrusion 32 is set such that the dimension D1 relative to the inner dimension D2 is preferably 20% or more and 95% or less, preferably 25% or more and 85% or less, more preferably 30% or more and 70% or less. L1.

Same as Modification 3-1, the base point of "inner dimension D2" and "projection dimension L1" refers to the width direction of the projection 32 on the inner periphery of the edge 31 (actually the extension of the inner periphery of the storage space)的中心点。 The center point. The "extended line forming the inner periphery of the storage space" does not actually appear because the protrusion 32 and the edge 31 are integrated. It is an imaginary line that smoothly connects the inner periphery of the edge 31 on both sides of the protrusion 32 .

Therefore, the heating element 1 of the modified example 3-2 can also exert the same effect as the above-mentioned embodiment.

(3.4) Variations on the structure of the bag body (variation 4) In the heating element 1 of the above embodiment, the bag body 2 is formed by stacking two sheets of the same shape and joining the four sides to form a bag shape. However, as shown in FIG. After the sheet is folded, its three sides are joined to form a bag shape. In the heating element 1 of Modification 4, the edge portion 31 is formed along three of the four sides of the bag body 2.

In the heating element 1 of Modification 4, one surface of the bag body 2 is the front side sheet portion 21, and the opposite side is the back side sheet portion 22. The front side sheet portion 21 and the back side sheet portion 22 are formed integrally. The part denoted by the symbol 34 in FIG. 6 is the folded part. From the viewpoint of ensuring strength, the folded portion 34 may also be welded.

The protrusion dimension L1 of the protrusion 32 is preferably set to 5% or more, more preferably 10% or more and 40% or less, and still more preferably 15% or more and 35% or less relative to the inner dimension D2. In addition, the protrusion size of the protrusion 32 is set such that the dimension D1 relative to the inner dimension D2 is preferably 20% or more and 95% or less, preferably 25% or more and 85% or less, more preferably 30% or more and 70% or less. L1.

The heating element 1 of the modified example 4 can also exhibit the same effects as the above-mentioned embodiment.

In addition, although illustration is omitted, it is also possible to use a sheet in which the back side sheet portion 22 and the front side sheet portion 21 are connected in a cylindrical shape, and the two sides thereof are joined to form the bag-shaped bag body 2. In addition, from the viewpoint of ensuring strength, the remaining two sides can also be welded.

(3.5) About the modification of the shape of the protrusion (modification 5) In the heating element 1 of the above embodiment, the protrusion 32 has an elongated shape in the protrusion direction, but the shape of the protrusion 32 may be the shape of the following modification examples 5-1 to 5-6.

(3.5.1) Variation 5-1 In the heating element 1 of the modified example 5-1, the protrusion 32 is formed in a semicircular shape as shown in FIG. 7(A), and the inner corner formed by the edge 31 and the protrusion 32 is not a smoothly connected curve. With horns. The center of the arc forming the edge on the side of the heating material 4 in the protrusion 32 is located on the edge portion 31 or closer to the side of the heating material 4 than the edge portion 31.

(3.5.2) Variation 5-2 In the heating element 1 of Modification 5-2, the protrusion 32 is formed into a substantially rectangular shape as shown in FIG. 7(B), and the outer corner 321 of the front end side in the protrusion direction of the protrusion 32 is substantially a right angle.

(3.5.3) Variation 5-3 In the heating element 1 of the modified example 5-3, the protruding portion 32 includes a convex portion 322 and a triangular portion 323 as shown in FIG. 7(C). The convex portion 322 is the base of the protrusion 32. The triangular portion 323 protrudes from the front end surface of the convex portion 322 in the protruding direction. The triangular portion becomes sharper in a way that its width becomes narrower as it goes to the front end.

(3.5.4) Variations 5-4 In the heating element 1 of Modification 5-4, the protrusion 32 is formed in a substantially triangular shape as shown in FIG. 7(D). The protruding portion 32 becomes sharper in such a way that the width becomes narrower as the protruding direction is directed.

(3.5.5) Variations 5-5 In the heating element 1 of the modified example 5-5, the protrusion 32 is formed in such a manner that the width becomes larger as it goes toward the protrusion direction as shown in FIG. 7(E). The edge of the protrusion 32 in the width direction is curved.

(3.6) Other changes In the following, other modified examples are listed.

The heating element 1 of the above embodiment has two protrusions 32, but it may have three or more protrusions 32.

In the heating element 1 of the above-mentioned embodiment, the protruding portion 32 is formed at the center of the bag body 2 in the longitudinal direction, but the protruding portion 32 may be formed at a position on the one end side in the longitudinal direction.

In the heating element 1 of the above-mentioned embodiment and each modified example, the recess 33 is provided at a position corresponding to the protrusion 32, but the recess 33 may not be provided.

In the present invention, like "substantially parallel" or "substantially orthogonal", the situation accompanied by the expression of "substantially" is used. For example, the so-called "substantially parallel" refers to the state of being "parallel" in nature, not strictly "parallel", and it also means an error of several percent. The performance of other accompanying "approximate" is also the same.

In addition, in the present invention, expressions such as "front end" and "front end" are used to distinguish between "...end" and "...end". For example, the so-called "front end" refers to a part having a certain range including the "front end". The performance of other accompanying "...ends" is also the same.

(4) Example Hereinafter, the present invention will be explained with examples. However, the present invention is not limited to the following examples.

Regarding Examples 1 to 3, the heating elements with protrusions were produced in the joints. For the comparative example, the heating elements without protrusions were produced in the joints. The temperature of the heating surface during heating was photographed with an infrared thermal imager, and the temperature distribution was compared. .

Regarding the heating elements of Examples 1 to 3 and Comparative Examples, as shown in Fig. 8(A) to Fig. 8(D), the heating surface is formed into a substantially rectangular shape, and the heating surface length dimension E1 (longest part)=181mm, Heating element with heating surface width dimension W=116mm. In the heating elements of Examples 1 to 3 and the comparative example, the materials of the heating material and the bag body are the same as the above-mentioned embodiment, and all the same are used. In addition, the amount of the heat-generating material in each of Examples 1 to 3 and the comparative example was set to 70 g, and all were set to the same weight.

Regarding the heating element of Example 1, as shown in Figure 8(A), a pair of protrusions are formed at one end of the heating surface, that is, E2=90.5mm (ie the center in the longitudinal direction), and the protrusions of each protrusion The size is set to L2=20mm.

Regarding the heating element of Example 2, as shown in Figure 8(B), a pair of protrusions are formed at one end of the heating surface, that is, E2=90.5mm (ie the center in the longitudinal direction), and the protrusions of each protrusion The size is set to L3=35.5mm.

Regarding the heating element of Example 3, as shown in Figure 8(C), a pair of protrusions are formed at one end from the heating surface, that is, E3=134.75mm, and the protrusion size of each protrusion is set to L3=35.5 mm.

Fig. 9 shows the results of photographing with an infrared thermal imaging camera in parallel with Examples 1 and 2 and the comparative example (Result 1). In addition, the area of each temperature range was calculated from the results of shooting with an infrared thermal imager, and the relationship between each temperature range and the area ratio of the temperature range relative to the whole area is shown in Table 1-1. In addition, the area ratio of the high temperature region (the temperature region above the maximum temperature -5°C and below the maximum temperature) is shown in Table 1-2, which is extracted from Table 1-1.

In addition, the shooting position is different from the result 1. FIG. 10 shows the result of shooting with an infrared thermal imaging camera in parallel with Examples 2 and 3 and the comparative example (result 2). In addition, the area of each temperature range was calculated from the result of shooting with an infrared thermal imager, and the relationship between each temperature range and the area ratio of the temperature range to the whole area is shown in Table 2-1. In addition, the area ratio of the high-temperature region is extracted from Table 2-1 and shown in Table 2-2.

The graph of Table 1-1 is shown in FIG. 11, and the graph of Table 2-1 is shown in FIG. 12. In the graph, the vertical axis is the area ratio (%) and the horizontal axis is the temperature (°C).

In Result 1, for each of Examples 1 and 2 and Comparative Example, the maximum temperature was extracted from Table 1-1, and the difference between the maximum temperature of Comparative Example and Examples 1 and 2 was calculated. Furthermore, the average temperature of the heating surface of each of Examples 1 and 2 and the Comparative Example was calculated, and the difference between the average temperature of the Comparative Example and Examples 1 and 2 was calculated. The results are shown in Table 3. [Table 1-1] Temperature [℃] Example 1 [%] Example 2 [%] Comparative example [%] Above 50, less than 51 0.00 0.00 0.00 49 or more, less than 50 0.00 0.00 0.02 More than 48, less than 49 0.00 0.00 12.54 47 or more, less than 48 13.11 0.00 15.77 Above 46, less than 47 20.54 8.67 13.90 45 or more, less than 46 14.84 26.78 12.17 More than 44, less than 45 9.97 15.31 8.62 Above 43, less than 44 7.33 11.10 6.69 42 or more, less than 43 7.01 7.64 5.07 41 or more, less than 42 5.35 5.85 3.98 40 or more, less than 41 4.26 4.91 4.00 More than 39, less than 40 3.80 3.98 2.75 38 or more, less than 39 2.32 3.48 2.75 37 or more, less than 38 2.19 3.05 2.09 36 or more, less than 37 2.21 2.30 2.52 35 or more, less than 36 1.36 1.80 1.71 34 or more, less than 35 1.28 1.94 1.73 More than 33, less than 34 2.30 1.93 1.59 More than 32, less than 33 1.53 0.68 1.39 31 or more, less than 32 0.55 0.39 0.52 30 or more, less than 31 0.02 0.20 0.21 More than 29, less than 30 0.00 0.00 0.00 [Table 1-2] Example 1 Example 2 Comparative example High temperature area [℃] 42.9-47.9 41.8-46.8 44-49 Area ratio of high temperature area [%] 66.6 70.7 63.0 [table 2-1] Temperature [℃] Example 2 [%] Example 3 [%] Comparative example [%] More than 52, less than 53 0.00 0.00 0.01 More than 51, less than 52 0.34 0.01 4.78 Above 50, less than 51 6.68 1.25 20.76 49 or more, less than 50 24.81 18.34 17.15 More than 48, less than 49 18.66 18.80 14.12 47 or more, less than 48 14.15 15.40 11.78 Above 46, less than 47 11.60 11.96 10.33 45 or more, less than 46 7.55 9.61 8.21 More than 44, less than 45 5.74 7.49 5.06 Above 43, less than 44 3.24 5.67 2.76 42 or more, less than 43 1.92 3.85 2.30 41 or more, less than 42 1.41 2.73 1.07 40 or more, less than 41 1.17 1.66 0.70 More than 39, less than 40 0.98 1.07 0.43 38 or more, less than 39 0.70 0.64 0.24 37 or more, less than 38 0.47 0.55 0.14 36 or more, less than 37 0.32 0.34 0.10 35 or more, less than 36 0.22 0.28 0.06 34 or more, less than 35 0.04 0.20 0.01 More than 33, less than 34 0.00 0.10 0.00 More than 32, less than 33 0.00 0.04 0.00 31 or more, less than 32 0.00 0.00 0.00 [Table 2-2] Example 2 Example 3 Comparative example High temperature area [℃] 46.4-51.4 46-51 47-52 Area ratio of high temperature area [%] 72.0 65.8 68.6 [table 3] Maximum temperature [℃] Difference with the maximum temperature of the comparative example [℃] Average temperature [℃] The difference between the average temperature of the comparative example [℃] Comparative example 49 44 Example 1 47.9 -1.1 44.1 0.1 Example 2 46.8 -2.2 43.4 -0.6

In result 1, it can be seen from FIG. 9 that the white part showing a higher temperature in the center of the heating surface in the comparative example is thicker and clearly present, but the white part of the heating element of Examples 1 and 2 is thinner than that of the comparative example. Also, as can be seen from Table 1-1, Table 1-2 and FIG. 11, compared with the comparative example, the area ratio of the high-temperature region of the heating elements of Examples 1 and 2 increased and the maximum temperature decreased by 1°C to 2°C.

In result 2, it can be seen from FIG. 10 that the white part showing a higher temperature in the center of the heating surface in the comparative example is thicker and clearly present, but the white part of the heating element of Examples 2 and 3 is thinner than that of the comparative example. Also, as can be seen from Table 2-1, Table 2-2, and Fig. 12, compared with the comparative example, the area ratio of the high temperature region of the heating elements of Examples 2 and 3 is approximately the same or more, and the maximum temperature is lowered by about 1°C.

Therefore, in the heating elements of Examples 1 to 3, compared with the comparative example, it is possible to lower the maximum temperature while keeping the area ratio of the high temperature region of the heating surface equal or more. In short, the heating elements of Examples 1 to 3 can suppress the local high temperature rise of the heating surface.

Especially from Table 1-2 and Table 2-2, it can be seen that in the heating elements of Examples 1 and 2, the area of the high-temperature region is increased by about 3.4% to 6.7% compared to the comparative example, and the maximum temperature is lower than that of the comparative example by 1℃~ 2°C. Therefore, it can be seen that if the protrusion is arranged at a position corresponding to the center of the heating surface, the maximum temperature of the heating surface can be lowered compared with the comparative example, and the area of the high temperature region can be increased. That is, by arranging the protrusion at a position corresponding to the center of the heating surface, the uniformity of the temperature distribution of the heating surface can be improved.

In addition, as can be seen from Table 3, the heating elements of Examples 1 and 2 have a maximum temperature difference of approximately 1 to 2°C compared with the comparative example, and the difference relative to this average temperature is 0.1 to 0.6°C. That is, compared with the comparative example, the heating elements of Examples 1 and 2 have a lower average temperature lower than that of the maximum temperature. That is, by arranging the protrusion at a position corresponding to the center of the heating surface, the maximum temperature of the heating surface can be lowered and the average temperature can be suppressed from decreasing.

1: heating element 2: bag body 21: Front side sheet part 22: Back side sheet part 3: Joint 31: Margin 311: Long Side 312: Short side 313: corner 314: Arc part 315: Straight line 32: protrusion 321: Outer corner 322: Convex 323: Triangle 33: recess 34: Folding part 4: heating material D1: size D2: Inside size E1: Length dimension E2: Length dimension E3: Length dimension H1: Width size L1: Protruding size L2: Protruding size L3: Protruding size T1: Straight line W: width size

Fig. 1 is a front view showing a heating element according to an embodiment of the present invention. Fig. 2 is a sectional view taken along line A-A of Fig. 1. Fig. 3 is a front view of the heating element of Modification 1. Fig. 4 is a front view of the heating element of Modification 2-1. Fig. 5(A) is a front view of the heating element of Modification 3-1. Fig. 5(B) is a front view of the heating element of modification 3-2. Fig. 6 is a front view of the heating element of Modification 4. Fig. 7(A) is an enlarged view of the protrusion of the heating element of Modification 5-1. Fig. 7(B) is an enlarged view of the protrusion of the heating element of Modification 5-2. Fig. 7(C) is an enlarged view of the protrusion of the heating element of Modification 5-3. Fig. 7(D) is an enlarged view of the protrusion of the heating element of Modification 5-4. Fig. 7(E) is an enlarged view of the protrusion of the heating element of Modification 5-5. Fig. 8(A) is a front view of the heating element of the first embodiment. Fig. 8(B) is a front view of the heating element of the second embodiment. Fig. 8(C) is a front view of the heating element of the third embodiment. Fig. 8(D) is a front view of the heating element of the comparative example. Figure 9 is a graph showing the temperature distribution of result 1. Figure 10 is a graph showing the temperature distribution of Result 2. Figure 11 is a graph showing the temperature distribution of result 1. Figure 12 is a graph showing the temperature distribution of Result 2.

1: heating element

2: bag body

21: Front side sheet part

3: Joint

31: Margin

311: Long Side

312: Short side

313: corner

32: protrusion

33: recess

4: heating material

D1: size

D2: Inside size

H1: Width size

L1: Protruding size

T1: Straight line

Claims (6)

A heating element with: A bag body, which is formed into a bag shape by a front side sheet portion and a back side sheet portion; and Heating material, which is enclosed in the aforementioned bag; The bag body has a joining part formed by joining the front side sheet part and the back side sheet part; The aforementioned joint includes: A rim, which is formed along at least a part of the outer periphery of the aforementioned bag; and The protrusion part protrudes from the edge part toward the heat generating material side. The heating element of claim 1, wherein the protrusion size of the protrusion is: the inner dimension of the bag body corresponding to the protrusion in the direction in which the protrusion protrudes is 15% or more and 35% or less. The heating element of claim 1 or 2, wherein in the direction in which the protruding portion protrudes, the dimension between the protruding portion and the portion facing the protruding portion is: relative to the position of the bag body corresponding to the protruding portion The inside dimension of the slab is 30% or more and 70% or less. Such as the heating element of any one of claims 1 to 3, which includes a plurality of the aforementioned protrusions, The protrusion directions of the plurality of protrusions are along a straight line. The heating element according to any one of claims 1 to 4, wherein a recess is formed at a position corresponding to the protrusion on the outer edge of the bag. The heating element according to any one of claims 1 to 5, wherein the bag body is formed in a rectangular shape in front view with a width and a length; The aforementioned edge portion includes a portion formed along the length direction of the aforementioned bag body; The protruding part is formed in the center part of the longitudinal direction of the bag body.

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