KR20030016490A - Sheet-shaped self-heating element and method of preparing the same - Google Patents

Abstract

PURPOSE: Provided is a sheet type self heating element which is formed of a thin layer and does not let the heating composition flow into one place or leak out and a method for producing the same. CONSTITUTION: The sheet type self heating element is produced by distributing powder of a heating composition on a web comprising at least two polymers having different melting points, compressing the web to a thin layer and spraying water or an aqueous solution of an inorganic substance on the web. After spraying water or a moisturizing substance on the web, the heating composition powder may be distributed. The heating composition powder may further comprise a thermally meltable hydrophilic adhesive. The sheet type self heating element also may further comprise another web laminated over the web.

Description

Sheet-shaped self-heating element and its manufacturing method {Sheet-shaped self-heating element and method of preparing the same}

The present invention relates to a sheet-shaped self-heating element that generates heat when contacted with air, and more particularly, to a web in order to prevent the heat-generating composition from biasing or leaking to one side and to have a thin film structure. It relates to a sheet-shaped self-heating body used and a method for producing the same.

In general, self-heating elements are used to heat or steam a part of the body because heat is generated when contacted with air.

Referring to FIGS. 1 and 2, an example of a conventional sheet-shaped self heating element is manufactured. The self heating element 1 prepares an exothermic composition powder prepared by mixing components necessary for an exothermic reaction to have a predetermined thickness.

The self heating element 1 is inserted into a sheet 3 formed with pores to allow air to pass through one or both sides thereof, and the sheet is inserted into a packaging bag 7 through which air does not pass and sealed in a vacuum state. Therefore, when the packing bag 7 is opened to take out the sheet 3 having the heat generating composition 1 embedded therein, air is transmitted through the pores formed in the sheet to generate heat while contacting the heat generating composition 1.

Then, one side of the sheet 3 is attached with a pressure-sensitive adhesive (5) and a release paper (6) removed during use to attach the self-heating body to the body.

However, the conventional self heating element manufactured as described above has a problem in that the exothermic composition powder is biased to one side by gravity and is inferior in adhesion when attached to the body.

3 and 4 show another example of the conventional sheet-shaped self heating element manufactured to improve the above problem.

Referring to this, the self-heating body 1 has the exothermic composition powder 3a manufactured by mixing components necessary for the exothermic reaction to have a predetermined thickness, and the nonwoven fabric 3b of the thin film adheres to both sides of the exothermic composition powder. Has a structure.

Then, the self heating element 1 is inserted into the sheet 3 formed with pores to allow air to pass through, and the sheet is inserted into a packaging bag 7 through which air does not pass and sealed in a vacuum state. Therefore, when the packing bag 7 is opened to take out the sheet 3 having the heat generating composition 1 embedded therein, air is transmitted through the pores formed in the sheet to generate heat while contacting the heat generating composition 1.

Then, one side of the sheet 3 is attached with a pressure-sensitive adhesive (5) and a release paper (6) to be removed when using the heat generating self-heating body to the body.

In the conventional self heating element 1 manufactured as described above, since the exothermic composition powder 3a and the nonwoven fabric 3b are not entangled with each other but are merely in close contact with each other, the composition powder 3a is formed of a nonwoven fabric after a certain time. 3b) There is a problem of biasing or leaking to one side within.

In addition, since the exothermic composition powder 3a and the nonwoven fabric 3b are separately manufactured and attached to each other, a large number of manufacturing processes are required and a lot of manufacturing time is consumed, and the thickness of the exothermic composition powder and the nonwoven fabric is limited due to the thickness of the exothermic composition powder and the nonwoven fabric. have.

Meanwhile, Korean Laid-Open Patent Publication No. 99-44351 discloses a product of a heat-compressed form by mixing a heat generating composition and a hot melt adhesive powder in a porous nonwoven fabric void and laminating another nonwoven fabric on the upper and lower surfaces thereof.

However, the self heating element product does not have a phenomenon that the heating composition is biased or leaked to one side, but due to the use of a three-layer nonwoven fabric, the manufacturing cost increases and it is difficult to manufacture thin.

The present invention has been made in order to solve this problem, the object is to produce a thin film, the phenomenon that the heating composition is not biased or leaking to one side, reducing the material cost, shortening the manufacturing process sheet-like porcelain The present invention provides a method of manufacturing a heating element and a sheet-shaped self heating element manufactured by the manufacturing method.

Method for producing a sheet-shaped self-heating body of the present invention for achieving the above object is to distribute the exothermic composition powder on the composite fiber web consisting of two or more kinds of polymers having a melting point difference, water or inorganic aqueous solution in a thin form prepared by compression It is characterized by being injected.

1 is a perspective view showing a structure of an example of a conventional self heating element,

2 is a cross-sectional view showing a state in which the self heating element of Figure 1 packed;

3 is a perspective view showing the structure of another example of a conventional self heating element,

4 is a cross-sectional view showing a state in which the self heating element of Figure 3 packaged,

5 is an exploded perspective view showing the structure of the self heating element according to the present invention;

Figure 6 is a cross-sectional view showing a state in which the self heating element packaged according to the present invention.

※ Explanation of code about main part of drawing ※

1: magnetic heating element 3: sheet

3a: heating composition powder 3b: nonwoven fabric

5: adhesive 6: release paper

7: packing bag 10: self heating element

11: pyrogen composition 12: web

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings. Incidentally, the same components as in the related art will be described using the same names and symbols.

5 is an exploded perspective view showing the structure of the self heating element according to the present invention, Figure 6 is a cross-sectional view showing a state in which the self heating element is packaged according to the present invention.

Referring to FIG. 5, the self heating element 10 according to the present invention has a structure in which the exothermic composition powder 11 is distributed in an empty space of a web 12 having hygroscopicity.

Referring to the manufacturing process of the self-heating body 10, first, the water or water-retaining material is sprayed on the absorbent web 12 in the first step, and the exothermic composition powder 11 on the web 12 in the second step. Evenly distribute.

In the third step, another web 12 or another hygroscopic web 12 having the exothermic composition powder 11 distributed thereon is selectively laminated on the web 12 on which the exothermic composition powder 11 is distributed, and adhered to be thin. Or combine.

In the fourth step, water or an inorganic aqueous solution is sprayed onto the thinly compressed web 12.

Here, the web 12 may be a composite fiber composed of two or more kinds of polymers having a melting point difference.

Web 12 of the present invention refers to the swelling state, that is, the normal cotton state before the step of producing a nonwoven fabric or sheet, in the present invention US Patent No. 4,269,888, Japanese Patent Laid-Open No. 8-323070, Japanese Patent Laid-Open No. 5 As disclosed in -33214 et al., Two or more fibers having different melting points from each other were used in a side-by-side type, sheath-core type, or a mixed state. Polyethylene (hereinafter referred to as PE) and Polypropylene (hereinafter referred to as PP) composite fibers, polyester (hereinafter referred to as PET) and PP composite fibers, PET and PET composite fibers, etc. It is suitable to use a melting point difference between the two fibers of about 20 ° C or more.

In addition, the web used in the present invention can be used both conventional dry or wet web.

On the other hand, inside the web used in the present invention, there are a plurality of voids like a conventional cotton. Therefore, when the powder particles are small in size or have a high density, they tend to pass through the pores and are biased downward by gravity when they are distributed by the method of spraying on the web. There is a problem that it is not evenly distributed in the voids of the web. In order to solve this problem, in the present invention, by spraying the moisture and liquid substances on the web or by applying a method, the heating composition powder can be evenly held sufficiently inside the web without being submerged by gravity. Examples of the water and liquid substances include volatile alcohols such as water, butanol, ethanol and methanol, and volatile organic solvents such as chloroform, methylene chloride and acetone.

On the other hand, as a raw material constituting the exothermic composition powder 11, all conventional compositions are possible, specifically, the oxidized metal powder, activated carbon and inorganic electrolyte. In the case of the inorganic electrolyte, it is a component of the exothermic composition powder when mixed with the raw material as a solid, but is not included in the exothermic composition powder when added as an aqueous solution after sheet molding.

Examples of the oxidizing metal powder include iron powder, zinc powder, aluminum powder or magnesium powder or powder of an alloy composed of two or more metal powders thereof, and mixed metal powders in which two or more of them are mixed. Among the powders, iron powders are most commonly used in view of safety, handleability, price, integrity and stability, and reduced iron powder, crushed iron powder, electrolytic iron powder and the like are preferred.

The particle size of the oxidizable metal powder is usually 60 mesh or less, preferably 50 mesh or less.

The blending ratio of the exothermic composition powder can not be collectively specified depending on the properties of the nonwoven fabric, the desired exothermic performance, and the like, but, for example, 5 to 20 parts by weight of activated carbon and 100 parts by weight of the oxidizing metal powder are used. 1.5 to 10 parts by weight and 20 to 60 parts by weight of water.

In addition, as desired, water-retaining agents such as pearl rock powder, vermiculite, and high-quality aqueous resins, or hydrogen generating inhibitors and anti-caking agents may be mixed.

In addition, a heat melting type hydrophilic adhesive may be added to the exothermic composition powder 11. Heat-melting hydrophilic adhesive is maintained in the form of a film in the manufacture of the self-heating element and absorbs moisture to reach an equilibrium state, thus the oxidation reaction occurs naturally in the exothermic composition powder.

Therefore, the hot melt hydrophilic adhesive can continuously maintain the exothermic reaction by the action of the water-soluble film, and may control the exothermic reaction according to the addition of water and the change of the liquidity. And after oxidation, there is a phenomenon of entanglement with each other, if included with the web does not occur phenomenon such as bias.

The self-heating body 10 thus produced is a thin envelope made of a moisture-permeable film or sheet 3 having air-permeable pores, or optionally one surface of a non-air-permeable film, as shown in FIG. It is inserted into a thin bag of sheets and sealed.

As the moisture-permeable film or sheet 3, a foamed or non-foamed film or sheet, paper, nonwoven fabric, woven fabric or porous film, sheet, nonwoven fabric, or the like is used. As the fabric, a woven fabric, a knitted fabric, a nonwoven fabric, or the like can be used.

The pressure-sensitive adhesive 5 or the adhesive matrix containing the pharmacologically active substance is attached to the moisture-permeable film or sheet 3 of the thin bag or to the bottom of the non-moisture-permeable film or sheet. Moreover, the release paper 6 attached at the time of use is attached to the adhesive 5.

As said adhesive layer, the layer formed from the solvent type adhesive, an emulsion type adhesive, or a hot melt type adhesive is mentioned.

Specific examples of the pressure-sensitive adhesive layer include a rubber pressure sensitive adhesive, a vinyl acetate pressure sensitive adhesive, an ethylene-vinyl acetate pressure sensitive adhesive, a polyvinyl alcohol pressure sensitive adhesive, a polyvinyl acetal pressure sensitive adhesive, a vinyl chloride pressure sensitive adhesive, an acrylic pressure sensitive adhesive, a polyamide pressure sensitive adhesive, and a polyethylene type. Although a layer formed of an adhesive containing a pressure-sensitive adhesive, a cellulose-based adhesive, a polysulfide adhesive, or a hot melt polymer material is exemplified, among these, the skin adhesiveness is good, and in addition to the low skin irritation, the deterioration of the adhesive strength even when heated Small ones are suitable, and for this reason, a layer formed of a pressure-sensitive adhesive containing a rubber-based pressure-sensitive adhesive, an acrylic pressure-sensitive adhesive or a hot melt polymer material is preferable.

In the heating element of the present invention, it is preferable that the pressure-sensitive adhesive layer is a poultry layer containing a poultice agent or a drug-containing layer containing or supporting a transdermal absorbent drug because heat effect is applied to obtain a poultice effect or a therapeutic or pharmacological effect by the drug.

In the heating element of the present invention, a percutaneous absorbent drug is added to the pressure-sensitive adhesive layer, thereby improving the topical treatment effect, improving the systemic treatment effect, or activating blood circulation by the thermal effect, thereby causing the drug to be applied to each part of the body. Since it can circulate, it is preferable in further improving the administration effect of each site | part.

The percutaneous absorbent drug is not particularly limited as long as it is percutaneous absorbent. Specifically, for example, a skin stimulant, an analgesic anti-inflammatory agent, a central nervous system agent (sleeping pill, an antiepileptic agent, a psychiatric nerve agent), a diuretic agent, an antihypertensive agent, a vasodilator, an antitussive agent, Antihistamines, arrhythmia drugs, cardiac drugs, corticosteroids, and local anesthetics. These drugs are used alone or in combination of two or more as necessary.

On the other hand, the self-heating body 10 is inserted therein and the sealed sheet 3 is inserted into the packaging bag 7 through which air does not pass and sealed in a vacuum state. Therefore, when the packing bag 7 is opened to take out the sheet 3 having the self heating element 10 embedded therein, air is transmitted through the pores formed in the sheet to generate heat while being in contact with the self heating element 10.

The self-heating body 10 according to the present invention manufactured as described above is not simply sandwiched between the web 12 and the web, the heating composition powder 11 is uniformly distributed in the empty space of the web, the web and the web is mutually Because of the entanglement, the heating composition powder is not biased or leaked to one side.

In addition, since the exothermic composition powder 11 is not a compressed structure to a predetermined thickness, the overall thickness of the self-heating body 10 can be made very thin.

In addition, since an appropriate amount of the web 12 is used as compared with the conventional manufacturing method using the nonwoven fabric manufactured by stacking the web several layers, the thickness of the web can be reduced and the unit cost can be reduced.

Hereinafter, the present invention will be described in more detail with reference to Examples, but the scope of the present invention is not limited to the following Examples.

(Example 1)

PE (melting flow rate 20g / 10min, melting point 190 ℃) and PP (melting flow rate 25g / 10min, melting point 230 ℃) were spun in a cis-core form at a weight ratio of 50:50 to obtain triple-stretched yarn (single-fiber fine 3 denier). After crimping and heat treatment in a conventional manner, cutting into 38 mm and manufacturing a web by passing a carding machine, spraying 14% by weight of moisture on the web, 47% by weight of iron and 10% of activated carbon thereon. %, 8% by weight of diatomaceous earth, 5% by weight of wood powder, 2% by weight of sodium chloride was equally distributed in the well-mixed exothermic composition powder.

Then, a web constructed in the same manner as the web was laminated thereon, heated and compressed at 210 ± 5 ° C. with a compressor to form a thin film, and then sprayed with 28% by weight of water on the thin compressed web to produce a thin self heating element. One side was sealed in a thin film envelope made of a moisture-permeable sheet and the other-side moisture-permeable sheet.

An acrylic pressure sensitive adhesive solution (Monsanto, Gelva 737) was previously applied to a release layer at 300 μm, dried at 70 ° C. for 10 minutes to form an adhesive matrix, and then transferred to the bottom of the non-permeable sheet of the manufactured self heating element. A self heating element attached to the body was prepared.

Example 2

30% by weight of ethanol is sprayed on the web of Example 1, and 51% by weight of iron, 8% by weight of activated carbon, 8% by weight of diatomaceous earth, 4% by weight of wood powder, and 3% by weight of sodium chloride are mixed well. The exothermic composition powders were evenly distributed.

Then, a web composed of the same structure as that of the web was laminated thereon, heated and compressed at 210 ± 5 ° C. with a compressor to be thin, and then a 26 wt% water was sprayed onto the thin compressed web to produce a thin self heating element. One side was sealed in a thin film envelope made of a moisture-permeable sheet and the other-side moisture-permeable sheet.

A polyisobutylene pressure-sensitive adhesive solution (National Starch, Duro-Tak 87-6430), which is a pressure-sensitive adhesive, was previously applied to a release layer at 300 μm and dried at 70 ° C. for 10 minutes to prepare an adhesive matrix. A self-heating body which was transferred to the bottom of the non-permeable sheet and attached to the body was prepared.

Example 3

30% by weight of ethanol is sprayed on the web of Example 1, 56% by weight of iron, 8% by weight of activated carbon, 7% by weight of diatomaceous earth, and 4% by weight of wood powder are mixed to obtain a well-mixed exothermic composition powder. Evenly distributed.

Then, a web constructed in the same manner as the web was laminated thereon, heated and compressed at 210 ± 5 ° C. with a compressor to form a thin film, and then an aqueous solution of 3 wt% sodium chloride dissolved in 26 wt% water on a thin compressed web. Was sprayed to prepare a self heating element of a thin film, and one side was sealed in a thin film-type envelope made of a moisture-permeable sheet and the other-side moisture-permeable sheet.

A polyisobutylene pressure-sensitive adhesive solution (National Starch, Duro-Tak 87-6430), which is a pressure-sensitive adhesive, was previously applied to a release layer at 300 μm and dried at 70 ° C. for 10 minutes to prepare an adhesive matrix. A self-heating body which was transferred to the bottom of the non-permeable sheet and attached to the body was prepared.

Example 4

Spraying 35% by weight of chloroform relative to the weight of the web on the web of Example 1, weighing 55% by weight of iron, 7% by weight of activated carbon, 8% by weight of diatomaceous earth, 4% by weight of wood powder to the well-mixed exothermic composition powder Evenly distributed.

Then, a web constructed in the same manner as the web was laminated thereon, heated and compressed at 210 ± 5 ° C. with a compressor, into a thin film, and then an aqueous solution of 4 wt% sodium chloride dissolved in 22 wt% water on a thin compressed web. The self-heating body of the thin film was prepared by spraying, and one side was sealed in a thin film envelope made of a moisture-permeable sheet and another surface of a non-moisture-permeable sheet.

0.5 g of ibuprofen was dissolved in 1.0 g of ethyl alcohol and N-methylpyrrolidone, and then mixed well with 11 g of an acrylic pressure sensitive adhesive (Monsanto, Gelva 737), a pressure-sensitive adhesive solution, and allowed to stand to remove bubbles. This solution was applied to a release layer at 320 μm and dried at 70 ° C. for 10 minutes to form an adhesive matrix containing pharmacologically active substances, and then transferred to the bottom of the non-permeable sheet of the prepared self heating element to obtain a self heating element attached to the body. Prepared.

Thus, according to the present invention, the self-heating element can be manufactured in a thinner film than the conventional self-heating elements, and since the heat-generating composition is distributed in powder form and entangled with the web, the heat-generating composition is biased or leaked to one side. It became impossible.

Comparing the sheet-like self-heating body and the conventional self-heating body manufactured in this way is shown in Table 1.

Table 1 is attached to the back (etc.) of the magnetic heating element and the commercial heating element produced in Example 1 to Example 5 of the present invention, the bias caused by the load of the heating composition powder, the thickness of the heating element, subject's This is a comparison of compliance.

Test Items Bias ¹⁾ Compliance ²⁾ thickness Example 1 Example 2 Example 3 Example 4 ◎◎◎◎ ◎◎◎◎ 1.3mm1.5mm1.7mm1.7mm Chikabari (Hisamitsusa, Japan) × △ 2.8mm Onpas (Mycoal, Japan) × △ 2.6mm

Hatto Softto (Pionic, Japan) ◎ × 2.7 mm

In the subscript 1) in Table 1, ◎ indicates that the exothermic composition maintains its original form even in the gravity, △ means that some of the exothermic composition is biased by gravity, and x is most of the exothermic composition by bias. In addition, in the subscript 2) compliance, ◎ is not rejection and movement is natural, △ feels a lot of rejection, moving part is dropped, × is very rejection, moving is more than 30%.

As described above, the present invention is not a structure in which the heating composition is inserted between the web and the web, but the heating composition has a structure in which the heating composition is uniformly distributed in the empty space of the web in the form of powder and the web and the web are entangled with each other. There is an effect that the composition is not entangled with the web to one side or leaking.

In addition, since the self heating element can be manufactured in a thin shape, the self heating element can be freely attached to the bent portion, and since a small amount of web is used, the unit cost can be reduced.

Claims (5)

A method of manufacturing a sheet-like self-heating body, characterized in that the heating composition powder is distributed on a composite fiber web composed of two or more polymers having a melting point difference, and then sprayed with water or an inorganic aqueous solution in a thin film prepared by compressing the exothermic composition powder. The method of manufacturing a sheet-like self-heating body according to claim 1, wherein the exothermic composition powder is distributed after spraying water or a water-retaining substance on the web. The method of manufacturing a sheet-shaped self heating element according to claim 2, wherein the web is selectively laminated and compressed with another web. The method of claim 1, wherein a heat-melting hydrophilic adhesive is added to the exothermic composition powder. A sheet-like self heating element manufactured by the manufacturing method of any one of claims 1 to 4.