KR100645672B1 - Method of preparing Sheet-shaped heating element - Google Patents

Abstract

The present invention relates to a method of manufacturing a sheet-like self heating element that generates heat when contacted with air, the method of manufacturing a self heating element according to the present invention by mixing the remaining elements other than water among the elements necessary for exothermic reaction to produce a heat generating composition Providing a step of filling the exothermic composition into a non-permeable sheet through which air is not permeable, perforating fine pores to the non-permeable sheet filled with the exothermic composition, and simultaneously injecting water to supply water; At the same time as the supply of moisture to the exothermic composition and at the same time comprising the step of sealing the sheet in a vacuum packaging bag through which air is not permeable, the present invention is a contact between the exothermic composition and the air during the manufacturing step By minimizing the amount of defects, it is possible to prevent the occurrence of defective products due to the oxidation phenomenon. Since the water in the water is evenly and sufficiently supplied to a whole it is possible to indicate the excellent effect of the heating efficiency, keep the heat generation sheet composition is filled with a semi-finished state is not kept in the packaging.

Sheet, heating element, pore, water, adhesive, packing bag

Description

Manufacturing method of sheet-shaped self heating element {Method of preparing Sheet-shaped heating element}

1 is a cross-sectional view showing an embodiment of a general self heating element,

2 is a conventional flow chart showing the steps of manufacturing a self heating element,

Figure 3 is a flow chart of the present invention showing a step sequence for producing a self heating element.

◎ Explanation of symbols for main part of drawing

1: exothermic composition 3: sheet

5: adhesive 6: release paper

7: packing bag

The present invention relates to a method of manufacturing a sheet-shaped self-heating element that generates heat when contacted with air, and more particularly, to manufacture a sheet-shaped self-heating element that can change the manufacturing step to reduce the occurrence rate of defective products and maximize the heat generation efficiency It is about a method.

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 the structure of a general self heating element, as shown in FIG. 1, the exothermic composition 1 is inserted into and sealed in a sheet 3 having pores through which air can pass, and the sheet is sealed in a non-air flowable bag ( 7) has a structure inserted into the vacuum sealed. Therefore, when the packaging bag 7 is opened to take out the sheet 3 in which the exothermic composition 1 is embedded, heat is generated while the air permeated through the pores formed in the sheet comes into contact with the exothermic composition.

The adhesive 5 is attached to one side of the sheet 3 so that the heat generating self heating element is attached to the body.

Referring to Figure 2 describes the conventional procedure of producing a self heating element having the structure as follows.

First, in the first step (S1) to prepare a exothermic composition by mixing a metal powder, water, activated carbon, a water-retaining agent and an alkali salt, which is essential for the exothermic reaction.

In the second step S3, the produced exothermic composition is placed in a sheet in which pores are formed so that air can pass through one side or both sides thereof, and the inlet is sealed.

Finally, in the third step S5, the sheet in which the exothermic composition is embedded is put in a packaging bag through which air is not permeated and sealed in a vacuum state.

However, the conventional self heating element having such a manufacturing step generates heat due to the oxidation reaction caused by contact with air during the manufacturing step, so that the heat quantity of the self heating element is lost, resulting in a decrease in heat generation efficiency, and a defective product having a non-uniform heating tendency. There was a problem that the yield of the manufacturing process falls.                         

In addition, as the product produced by the exothermic reaction solidifies, various problems are caused. Once the work is started, it is difficult to stop the work during the process because the manufacturing process must be carried out continuously, and the life of the device is shortened due to the adhesion of oxides to the manufacturing equipment, and the inconvenience of cleaning the oxides. In addition, the heat of oxidation of the exothermic composition created a fire hazard.

In addition, US Patent No. 5879378 discloses a method of manufacturing a sheet-shaped self heating element by dividing it into an exothermic layer containing metallic powder and other powders and a reaction auxiliary layer containing water and other components, and laminating them. However, in the manufacturing method of the patent, the exothermic reaction layer and the reaction assisting layer are combined during the manufacturing step, and the exothermic reaction is started by contact with air to generate heat, so that the heat quantity of the self-heating element is lost, the exothermic efficiency is reduced, and the exothermic trend is not uniform. It was difficult to overcome the disadvantage that the defective product is not generated.

Therefore, the manufacturing process of the self-heating element is carried out while the air is cut off during the manufacturing process, but this increases the manufacturing cost of the self-heating element and prevents the sheet from being stored in the semi-finished state in which the sheet is not stored in the production step. There were many difficulties and discomforts.

In order to improve such a problem, Korean Patent Registration No. 173549 discloses a method of manufacturing a self heating element by adjusting the amount of moisture, which is one of the essential components in self heating.

That is, using the property that the amount of water in the heating element composition is excessively large, or at least the rate of the exothermic reaction is significantly reduced, the excess heat is added to make the exothermic composition into a viscous ink state or a cream state and absorbent foam. Laminated on a film, paper, non-woven fabric, woven fabric or porous film, sheet to form a sheet-like heating element in which the heating composition in the ink state or cream state penetrates, and the heating sheet thus prepared is placed in an envelope having a suitable air permeability, and is not allowed to pass air. It is to make a self heating element having a structure sealed in a vacuum state in a packaging bag.

The self-heating element manufactured as described above becomes a complete self-heating element by absorbing excess moisture in the heat-generating composition by absorbing excess moisture in the heat-generating composition in a vacuum-packed bag. It is a structure that generates heat while contacting air.

However, the biggest problem of the self heating element having such a structure is that the amount of moisture absorbed by the absorbent sheet from the ink-like heat composition containing excess water is uneven, so that the moisture content of the equilibrium heating composition is also uneven. After opening the envelope, a deviation occurs in the heating state, and because the moisture state is not optimized, the heating efficiency is lowered.

The present invention has been made in order to solve such a problem, the object is to prevent the exothermic composition is generated by the exothermic composition is generated during the manufacturing process, to maximize the exothermic efficiency by supplying the optimum moisture to the exothermic composition, The present invention provides a method of manufacturing a sheet-shaped self heating element which can be stored and improves work efficiency.                         

The above object is a method of manufacturing a sheet-shaped self-heating body, by drilling fine pores on one side or both sides of a non-breathable sheet filled with a heat generating composition excluding water as an essential component, and simultaneously spraying or injecting water into the pores, the self-heating body It achieves by the manufacturing method of the sheet-like self-heating body characterized by providing air permeability to and ensuring supply of water to a heat generating composition simultaneously.

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

The self heating element according to the present invention is used for the warming of animals and plants, the warming of food, the warming of mechanical apparatus, etc., since it has the same structure as the general self heating element described above with reference to FIG. A separate description will be omitted, and only the manufacturing method compared with the prior art will be described.

Referring to FIG. 3, a manufacturing step according to the present invention for a sheet-shaped self heating element is described. First, in the first step (S10), a heating element 1 is prepared by mixing the remaining elements except water among the essential elements in the exothermic reaction. do.

As a raw material for constituting the exothermic composition powder, all conventional compositions can be used, and specifically, oxidized metal powder, activated carbon, and an 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, powder of an alloy composed of two or more metal powders thereof, and mixed metal powders of two or more of these powders. Among the powders, iron powder is mainly 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 (1) as a whole depends on the intended exothermic performance and cannot be collectively specified. For example, 5 to 30 parts by weight of activated carbon and 100 parts by weight of an oxidizing metal powder are used. 1.5 to 10 parts by weight and 25 to 70 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 the second step (S12), the inlet is sealed by placing the exothermic composition 1 in the film or sheet 3 through which air is not permeated.

Here, the appropriate thickness of the film or sheet 3 varies greatly depending on the use, and is not particularly limited, but specifically 10 to 5000 um when worn on the foot and 10 to 500 um when used directly on the human body, particularly It is more preferable to set it as 15-250um, and it is preferable to set it as 10-2500um generally. The unit weight of the film or sheet 3 is usually 20 to 500 g / m 2, preferably 30 to 300 g / m 2, but is not particularly limited and a suitable one is selected depending on the application.

And, the film or sheet (3) is one or more laminated from the group consisting of PET, PP, PVC, PU, PS, PC, PETG, EVOH, PE and nylon, or laminated on paper, non-woven fabric, woven fabric The water vapor transmission rate is 20 g / m 2 · 24 hr or less, but is not particularly limited, and an appropriate one is selected depending on the application.

On the other hand, the pressure-sensitive adhesive 5 or the adhesive matrix containing the pharmacologically active substance may be attached to the bottom of the film or sheet 3.

The pressure-sensitive adhesive 5 is applied on the release paper 7 to a predetermined thickness, dried at 70 ° C. for 10 minutes to form an pressure-sensitive adhesive matrix, and then transferred to the bottom of the manufactured sheet.

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 rubber-based adhesives, vinyl acetate-based adhesives, ethylene-vinyl acetate-based adhesives, polyvinyl alcohol-based adhesives, polyvinyl acetal-based adhesives, vinyl chloride-based adhesives, acrylic adhesives, polyamide-based adhesives, polyethylene-based adhesives, and celluloses. Although a layer formed of a pressure-sensitive adhesive, a polysulfide pressure-sensitive adhesive or a pressure-sensitive adhesive containing a hot-melt polymer material may be mentioned. Among them, the skin adhesiveness is good, and in addition to the low skin irritation, it is suitable that the decrease in the adhesive force is small even when heated. For this reason, a layer formed of a pressure-sensitive adhesive containing a rubber 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 the 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 to improve the topical treatment effect, improve the systemic treatment effect, or activate the blood circulation by the thermal effect, thereby applying the drug 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.

In the third step S14, water is injected through the microneedle while puncturing fine pores with a microneedle having a needle structure on one or both surfaces of the non-transmissive film or sheet 3 filled with the exothermic composition 1. By spraying high pressure water, the pores of the non-permeable film or sheet are punctured and water is injected to impart breathability to the non-permeable film or sheet, and at the same time, the water is mixed in the exothermic composition 1.

The fine needle of the injection needle structure has a structure of 500um or less in the outer diameter and 400um or less in the inner diameter, but without particular limitation, an appropriate structure may be selected according to the size of the pores to be drilled and the amount of water to be sprayed.                     

In addition, the high-pressure water may be selected to a suitable pressure enough to puncture the pores according to the properties of the non-permeable film or sheet, the amount of water injected into the exothermic composition.

Here, the fine pores formed in the non-transmissive film or sheet is preferably perforated to a width of 500um or less so that the exothermic composition does not leak.

And the total area of the perforated pores relative to the total area of the self heating element in contact with air is preferably 0.03 to 0.3%.

When it is described with respect to the moisture permeability, the moisture permeability of the moisture-permeable film or sheet of the self heating element generally has 100 to 2000 g / m 2 · 24hr depending on the purpose of use. If the permeable film has a radius of 150 μm, the permeability is about 95 ± 30 g / ㎡ · 24hr, and the permeability is about 95 ± 30 g / ㎡ · 24hr, and the total area ratio (total pore area / film area) of the corresponding pores is 0.035. %, The permeability is about 600 ± 60 g / ㎡ 24hr when punctured 20000 / m2, the total area ratio of the corresponding pores is 0.14%, the permeability is about 1900 ± 230 g / perforation Since the total area ratio of the pores corresponding to m 2 · 24 hr is 0.32%, the total area ratio of the perforated pores to the total area of the self heating element in consideration of moisture permeability is preferably 0.03 to 0.3%.

The fourth step (S16) is carried out at the same time as the third step (S14) finishes, in this step (S16) to put the sheet (3) sprayed with water into a non-permeable packaging bag (7) through which no air flows in a vacuum state Seal with.

Since the self heating element completed through these steps is packaged in a vacuum state at the same time as the moisture is supplied to the exothermic composition, the phenomenon in which the exothermic composition is exothermic by contact with air is not generated during the manufacturing step. The failure rate is significantly reduced, and the heat generation time is improved compared to the conventional.

In addition, the present invention does not have to work in an environment in which air is blocked as in the prior art, and the workability can be stored in a semi-finished product state in which the sheet just before forming pores by perforation is not stored in a packaging bag. Good, manufacturing cost is reduced.

In addition, it has excellent exothermicity because the content of water in the exothermic composition is supplied uniformly and sufficiently throughout.

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

Preparation Example 1.

10.0 g of iron, 1.4 g of activated carbon, 1.6 g of diatomaceous earth, 0.8 g of wood powder, and 0.4 g of sodium chloride were weighed and mixed well to prepare exothermic composition powder.

Examples 1-4

In Example 1, the exothermic composition powder obtained in Preparation Example 1 was spread and sealed in a non-permeable sheet made of PE, and then 150 micrograms of 100/100 cm ² were formed on one surface of the manufactured sheet using a microneedle having an outer diameter of 400 μm and an inner diameter of 250 μm. At the same time, 5.8 g of water was injected and the sheet-like self heating element was placed in a non-permeable packaging bag and sealed in a vacuum state.

In addition, Example 2 to Example 4 was prepared in the sheet-like self-heating body in the same manner as in Example 1 using a microneedle having a variety of structures as shown in Table 1.

Examples 5-8

Example 5 After the heat generating composition powder obtained from Preparation Example 1, the sealing insert stretch the impermeable sheet of PE material, by spraying the high pressure of the water on one side of the prepared sheet of the micro pores having a diameter of 350um 150 gae / 100cm ² is The sheet-like self-heating body was placed in a non-permeable packaging bag and sealed in a vacuum state while being punctured as much as possible while containing 5.8 g of water.

In addition, in Example 6 to Example 8, the sheet-shaped self-heating body was manufactured in the same manner as in Example 5 by spraying high pressure water to form micropores having various structures as shown in Table 2 below.                     

Example 9

The exothermic composition powder obtained in Preparation Example 1 was stretched and sealed in a non-permeable sheet made of PE material laminated on a PP nonwoven fabric, and then polyisobutylene pressure-sensitive adhesive solution (National Starch, Duro-Tak 87-6430) which was a pressure-sensitive adhesive in advance. Was applied to a release sheet at 300㎛ and dried for 10 minutes at 70 ℃ to form an adhesive matrix, and then transferred to the bottom of the prepared sheet.

On the upper surface of the sheet thus prepared, the microporous needle having a diameter of 350 μm and an internal diameter of 200 μm was used to drill 120/100 cm ² micropores and spray 5.8 g of water, and the sheet-like self heating element was placed in a non-permeable packaging bag and vacuumed. By sealing, a self-heating body which can be attached to a human body or an animal was obtained.

Example 10

The exothermic composition powder obtained in Preparation Example 1 was placed in a non-permeable sheet of PE laminated on a nylon nonwoven fabric, and then sealed.                     

0.8 g of ketoprofen was previously dissolved in 1.0 g of ethyl alcohol, and then 1.0 g of propyllin glycol and 1.0 g of propylene glycol monolaurate were added to the solution, mixed well, and an acrylic pressure-sensitive adhesive (Monsanto, Gelva 1430) was mixed well with 12 g and allowed to stand to remove bubbles. The solution was applied to a release sheet at 300 μm, dried at 70 ° C. for 10 minutes to form an adhesive matrix containing pharmacologically active material, and then transferred to the bottom of the prepared sheet.

On the upper surface of the sheet thus manufactured, 200 micrometers / 100 cm ² micropores were punctured with a fine needle having an outer diameter of 250 μm and an inner diameter of 100 μm, and 5.8 g of water was sprayed. By sealing, a self-heating body which can be attached to a human body or an animal was obtained.

Example 11

The exothermic composition powder obtained in Preparation Example 1 was spread and sealed in a non-permeable sheet made of PE material laminated on a PP nonwoven fabric, and the acrylic pressure-sensitive adhesive (Monsanto, Gelva 737), which was a pressure-sensitive adhesive, was previously applied to a release layer at 300 μm. After drying for 10 minutes at 70 ℃ to form a pressure-sensitive adhesive matrix, it was transferred to the bottom surface of the prepared self heating element.

Injection to the water containing 5.8g by high-pressure jets of water to micropores having a diameter of 250um, while drilling such that the 200 / 100cm ^2, and the sheet is self-heating element on one surface of the resulting sheet in a non-permeable packaging bag It was put and sealed in a vacuum state to obtain a self-heating body that can be attached to humans or animals.

Example 12

The exothermic composition powder obtained in Preparation Example 1 was placed in a non-permeable sheet of PE laminated on a nylon nonwoven fabric, and then sealed.

0.4 g of pyroxicamp was dissolved in 1.8 g of dimethyl sulfoxide and 1.5 g of diethylene glycol monoethyl ether, and 0.3 g of lauthiethanolamide and 0.5 g of polyethylene glycol 200 monolaurate were added to the solution. After mixing well, the mixed solution was mixed well with 11 g of a polyisobutylene pressure-sensitive adhesive solution (Duro-Tak 87-2852, National Starch), which was a pressure-sensitive adhesive solution, and allowed to stand to remove bubbles. The solution was applied at 400 μm on a release sheet and dried at 70 ° C. for 10 minutes to form an adhesive matrix containing pharmacologically active material, and then transferred to the bottom of the prepared sheet.

High pressure water is sprayed on one side of the manufactured sheet to drill 300 micron holes with a diameter of 200/100 cm ² and to spray 5.8 g of water, and the sheet-like heating element is placed on a non-permeable packaging bag. It was put and sealed in a vacuum state to obtain a self-heating body that can be attached to humans or animals.

Experimental Example 1

According to the method of the Japanese Industrial Standards (JIS S 4100), the sheet-like self heating element produced in the same manufacturing steps as Examples 1 to 12 was tested for the exothermic tendency as shown in Table 3 below.                     

Comparative Example 1

When the sheet-like self-heating element produced by the manufacturing step as described above is compared with the conventional manufacturing method, the efficiency is shown in Table 4 below.                     

1) Heat generation time (minutes) during the process: The self heating element temperature during the manufacturing process is maintained at 30 degrees or more

2) Process yield (%): Weight of the final manufactured heating composition × 100 / Weight of initially input heating composition

As described above, the present invention has a high yield in the manufacturing process because it is possible to prevent the generation of defective products due to the oxidation phenomenon by minimizing the heat generation of the exothermic composition in contact with the air during the manufacturing step of the self heating element. The exothermic efficiency has a good effect because the moisture is supplied uniformly and sufficiently to the exothermic composition as a whole.

In addition, the sheet filled with the exothermic composition can be stored in a semi-finished state not stored in the packaging bag, and the work can be interrupted during the process, thereby providing excellent workability and reducing manufacturing costs since no equipment for blocking air is required. Since the oxide is not attached to the device, it minimizes the shortening of the life of the device due to the corrosion of the device, there is no inconvenience in cleaning the equipment, there is an effect that can reduce the risk of fire due to the heat of oxidation during the process of the exothermic composition.

Claims (4)

In the manufacturing method of the sheet-shaped self heating element, Perforated fine pores on one or both sides of the non-breathable sheet filled with a heating composition other than water as an essential ingredient, and spraying or injecting water into the pores to impart breathability to the self-heating body and supply water to the heating composition at the same time. A method for producing a sheet-shaped self heating element, which is ensured. The method of manufacturing a sheet-shaped self-heating element according to claim 1, wherein the method for drilling fine pores on one side or both sides of the non-breathable sheet is perforated with a fine needle or sprayed with high pressure water. The method of manufacturing a sheet-shaped self heating element according to claim 1, wherein the fine pores on the sheet have a width of 500 μm or less, and the total area of the perforated pores is 0.03 to 0.3% of the total area. The method of claim 1, wherein the pressure-sensitive adhesive is attached to the bottom surface of the non-breathable sheet or the adhesive matrix containing a pharmacologically active material is attached.

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