JPH09557A - Heat generating bdy sheet - Google Patents

Abstract

PURPOSE: To provide a heat generating body sheet for directly pasting a heat generating body such as a disposable body warmer to a body skin for heat insulating and heating purposes. CONSTITUTION: A pressure sensitive adhesive layer 3 is formed on a reverse side of a heat generating body 2 and a heat generating body sheet directly pasted to a body skin has the layer 3 formed out of a plurality of dotted sections 7 having an outer diameter between 3 mm and 5 mm. Also, the total area of the sections 7 occupies 30% to 7O% of the area of the reverse side of the body 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heating element sheet for directly sticking a heating element such as a disposable body warmer to the skin of the body to keep it warm.

[0002]

2. Description of the Related Art A conventional disposable body warmer can be operated by a simple operation such as manually rubbing the contents (exothermic composition) containing iron powder and an oxidation promoter in a bag, or from a vacuum-packaged outer bag. Since it is extremely easy to generate heat simply by taking it out, it has become widely used in place of the electric warmers used up to then. However, since this disposable body warmer does not have any attachment means by itself, it can be held only by a hand or put in a pocket of clothes, for example, to warm a waist or the like. In some cases, it was necessary to hold it over the clothes with paper tape or hands.

Therefore, a disposable adhesive body having a pressure-sensitive adhesive layer provided on the back side thereof has been developed. By attaching the disposable body warmer to the inside or underwear of a suit, coat, jumper or the like, a desired portion is heated or heated. Being able to keep warm, it has come into widespread use. As such a disposable body warmer with an adhesive layer, for example, the actual open body 61-
A pressure-sensitive adhesive body warmer disclosed in Japanese Patent No. 139218 and a heating element structure disclosed in Japanese Utility Model Publication No. 6-33929 are proposed.

[0004]

However, in any of the conventional disposable body warmers with a pressure-sensitive adhesive layer as described above, since the pressure-sensitive adhesive layer is formed over the entire back surface of the body warmer, it is applied directly to the skin. When it is worn, there is a problem that it peels off due to sweating, rash due to the inhibition of sweating, or that the skin cannot breathe. That is, such a conventional disposable body warmer with a pressure-sensitive adhesive layer is essentially forced to adopt the method of sticking to the inner side of the outerwear or the underwear as described above. On the other hand, a disposable body warmer having a configuration in which no adhesive is present in the central strip on the back of the body warmer, that is, a configuration in which the adhesive layer is provided in the form of a strip on the left and right sides of the body back is commercially available. This disposable body warmer has a cut in the center of the release paper to be attached to the adhesive layer, and since there is no adhesive below this cut, the release paper can be easily peeled off from the edge of this cut. Although it has an advantage, since the pressure-sensitive adhesive layers provided in strips on the left and right exist in a solid state, the same problem as described above occurs when directly applied to the skin of the body.

[0005]

The present invention has been proposed in view of the above, and is a heating element sheet which is provided with an adhesive layer on the back surface of a heating element and is directly adhered to the skin of the body, wherein the adhesive layer has a plurality of layers. The present invention relates to a heating element sheet which is composed of spots having an outer diameter of 3 to 5 mm, and the total area of the spots is 30 to 70% of the area of the back surface of the heating element.

[0006]

In the heating element sheet of the present invention having the above structure, only the spots of the pressure-sensitive adhesive layer adhere to the skin when it is attached to the skin, and the portions where the spots are not provided become continuous non-adhesive portions. Therefore, the adhered portion and its periphery can be kept warm and heated without inhibiting skin respiration and sweating and without peeling off due to sweating from the skin. Also, since the adhesive layer is composed of a plurality of spots,
The edge can be easily peeled off when the release paper is removed during use. Furthermore, the sweat produced by heating is
Although it is discharged from the continuous non-adhesive portion to the peripheral edge portion, even if the heating element sheet is transparent, especially when the base material forming the front and back of the heating element is made of a material having air permeability. Since it is discharged, sweat does not collect on the skin surface and promotes sweating.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to embodiments of the drawings. 1 and 2 show that a part of the heating element sheet 1 is omitted,
In addition, it is a perspective view and a sectional view seen from the back surface. This heating element sheet 1 is composed of a heating element 2 and an adhesive layer 3 provided on the back surface (upper surface in the drawing) of which a release liner 4 called release liner or release paper is attached to the surface of the adhesive layer 3. Have been combined.

The heating element 2 has a structure in which a heat generating composition 6 which generates heat due to the presence of air is enclosed inside a flat bag body 5. The bag body 5 is formed by stacking a breathable top sheet and a back sheet on each other and joining their peripheral edges by heat sealing or the like. The composition of the exothermic composition 6 is not particularly limited as long as it can maintain a safe temperature for a long time without causing low-temperature burn.

The pressure-sensitive adhesive layer 3 has a plurality of outer diameters of 3 to 5 m.
., and the total area of the spot portions 7 is 30 to 70% of the area of the back surface of the heating element 2 (= the area of the heating element sheet 1). The spotted portion 7 is circular,
It may be oval, square, triangular, or any other shape. Also, even if the outer diameter is smaller than 3 mm, it is rather preferable for the skin, but the smaller the outer diameter is, the larger the total number is in consideration of the regulation of the total area, and the adjacent spots 7 are easily united and easily expanded. Therefore, it is not preferable. On the other hand, if the outer diameter is larger than 5 mm, the area of the skin where the skin respiration and sweating are suppressed becomes large, which may cause a rash during use, which is not preferable. Further, if the total area of the spots 7 is less than 30% of the area of the back surface of the heating element, sufficient adhesive force may not be obtained and peeling may occur during use. On the other hand, if it is more than 70%, the area of the skin where the skin respiration and sweating are suppressed becomes large, which may cause a rash during use, which is not preferable. The pressure-sensitive adhesive used in the pressure-sensitive adhesive layer 3 is not particularly limited in its composition, thickness, etc., as long as it is a safe one that does not adversely affect the skin, and depending on the additional purpose. Additives may be mixed, for example, a solventless type rubber-based adhesive that does not contain any organic solvent or reactive monomer can be used, and the adhesive force can maintain a minimum weight (weight of heating element sheet). It should be set so that it does not cause pain when peeled from the skin after use.

In the production of the heating element sheet 1, for example, the heating element 2 in which the exothermic composition 6 is enclosed in the bag body 5 is prepared in advance according to the production of a conventional disposable body warmer.
On the back surface of the heating element 2, the pressure-sensitive adhesive layer 3 composed of a plurality of spots is provided on the heating element sheet 1 of the present invention.
However, this method is not suitable for mass production. Although not particularly limited, it can be produced as follows in consideration of productivity.

In advance, a pressure-sensitive adhesive layer 3 consisting of the above-mentioned plural spots 7 is provided on one surface of the base material (back surface sheet of the bag 5), and a release paper 4 is attached to the surface thereof to form a label-like sheet. Create. In the case of mass production, on the surface of the substrate supplied by a roll winding of several meters width, the adhesive is continuously applied in a substantially dot shape by various known roll coaters, and if necessary (solvent drying type, Alternatively, in the case of a thermosetting type pressure-sensitive adhesive, it can be prepared by drying and then laminating a release paper having substantially the same width as the base material. A double-sided tape-like sheet may be formed by forming an adhesive layer (the entire surface may be solid-coated) on the other surface side (the opposite surface side on which the adhesive layer 3 composed of a plurality of spots 7 is provided). Then, the label-like sheet (or the double-sided tape-like sheet) produced as described above is used as the back sheet of the bag body 5, and production is performed according to the production of a conventional disposable body warmer. That is, the surface sheet cut into a suitable width and the label-like sheet (or double-sided tape-like sheet) are superposed, and the heat-generating composition 6 is interposed therebetween, and the peripheral portions of both sheets are heat-sealed or the like. And the heating element sheet 1 of the present invention is obtained.

<Pasting Test> A heating element sheet according to an example of the present invention was produced by the above procedure. A non-woven fabric having a basis weight of 80 g was used as the base material forming the front and back of the heating element. The pressure-sensitive adhesive layer uses a solvent-free type rubber-based pressure-sensitive adhesive (normal adhesive force to the skin of the subject is 250 g or more, aging adhesive force is 250 g or more), the thickness is 25 μm, and the outer diameter is 3 μm.
The circular portion of mm was formed to be 50% of the area of the back surface of the heating element. A heating element sheet of a comparative example was prepared in exactly the same manner except that the pressure-sensitive adhesive layer was formed on the entire back surface (solid shape). The heating element sheets of the above-mentioned Examples and Comparative Examples were placed side by side on the skin of the subject, left to stand and observed. As a result, the heating element sheet of the comparative example was peeled off in about 1 hour, and it was confirmed that the cause was sweating. On the other hand, the heating element sheets of the examples did not peel off even after 24 hours, and there was no itch caused by a rash.
It retained good heat retention and heating effects. Further, it was also confirmed that it has an effect of reducing the amount of the heat-generating composition contained in the bag, as compared with the heat-generating sheet attached to the inside of the conventional outerwear or the underwear.

Although the present invention has been described above based on the embodiments, the present invention is not limited to the above-mentioned embodiments, and may be carried out in any manner unless the configuration described in the claims is changed. You can

[0014]

As described above, when the heating element sheet of the present invention is attached to the skin, only the spots of the adhesive layer adhere to the skin to form a continuous non-adhesive portion, so that skin respiration It is possible to heat and heat the adhered part and its periphery without inhibiting the sweating from the skin or the skin and without peeling off due to the sweat from the skin. Further, since the pressure-sensitive adhesive layer is composed of a plurality of spots, the edge can be easily peeled off when the release paper is removed during use, and it is not necessary to purposely provide a shearing portion in the center of the release paper. . Furthermore, the sweat generated by heating flows down from the continuous non-adhesive portion to the peripheral portion and is discharged. Especially, when the base material forming the front and back of the heating element is made of a breathable material, Since it is discharged even through the heating element sheet, sweat is not accumulated on the skin surface and promotes sweating.

[Brief description of drawings]

FIG. 1 is a perspective view of a heating element sheet, a part of which is cut off, viewed from the back side.

FIG. 2 is a cross-sectional view of the heating element sheet of FIG.

[Explanation of symbols]

 1 Heating Element Sheet 2 Heating Element 3 Adhesive Layer 4 Release Paper 5 Bag Body 6 Exothermic Composition 7 Spots

Claims (2)

[Claims] 1. A heating element sheet which is provided with an adhesive layer on the back surface of a heating element and is directly adhered to the skin of the body, wherein the adhesive layer is composed of a plurality of spots having an outer diameter of 3 to 5 mm. The total area of the spots is 30 to 70 of the area of the back surface of the heating element.
% Heating element sheet. 2. The heating element sheet according to claim 1, wherein the base material forming the front and back surfaces of the heating element has air permeability.