JPH042342A - Manufacture of heat generating body - Google Patents

Abstract

PURPOSE:To enable the manufacturing of a heat generating body filled with a specified amount of an exothermic agent at a desired position within an internal bag by utilizing a mutual magnetic force between two magnet sheets. CONSTITUTION:A conveying structural body 12 has a sponge sheet 7 applied on a conveying substrate 8 into which a cutting blade 9 is buried and a magnet sheet 6 made up of a sheet shaped rubber magnet cut out in a desired shape is applied on the external surface thereof. Moreover, a breathing wrapping materials is put on the body to be fixed with a fastener 10 and the body is carried to a magnetic force transfer process with both ends of the conveying substrate 8 supported by a roller 11. On the other hand, a rotary structural body of the magnet sheet 3 is a drum-shaped rotary structural body having a sheet shaped rubber magnet applied on the surface of the drum 2 as intact and a layer 4 and is kept in contact with a precursor 1 of the heating agent to form a layer 4 to which the precursor 1 is always attached at a fixed thickness. Therefore, when the conveying structural body 12 is conveyed to approach the rotary structural body, the precursor 1 of the heating agent can be transferred onto an internal surface of the breathing wrapping material 5 by a magnetic force at a fixed thickness in a desired shape.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a method for manufacturing a heating element that generates heat in the presence of air, and more specifically, a method for manufacturing a heating element that generates heat in the presence of air. The present invention relates to a method of manufacturing a heating element using a magnetic transfer method.

[Prior art and problem M to be solved by the present invention] The exothermic agent consisting of metal powder, water, water retention agent, oxidation aid, etc.
It does not require ignition and generates heat simply by contacting air (oxygen).

In recent years, heating elements in which the exothermic agent is housed in a bag having ventilation holes (hereinafter referred to as an inner bag) have become popular as disposable body warmers. This known heating element is housed in another bag (hereinafter referred to as the outer bag) made of an air-impermeable film, and is removed from the outer bag when used. A conventional industrial manufacturing method for this heating element is described in JP-A-56-119246. In this method, two packaging materials (at least one of which is a breathable packaging material) are stacked and sealed on three sides, and the exothermic agent is dropped in the direction of gravity and filled into the storage area formed from this seal. Next, the heating element is obtained by sealing it. However, with this method, it is difficult to fill and disperse the exothermic agent at the desired location in the rental room.
It is not possible to easily manufacture a heating element in which a heating agent is dispersed in a desired position.

An object of the present invention is to provide a method applicable to the industrial production of heating elements in which a heating agent is dispersed at desired locations.

[Means for solving the ff problem] As a result of intensive studies to solve the above problem, the inventors of the present invention have found that a heat generating agent containing metal powder and generating heat in the presence of air is housed in an inner bag. When manufacturing a heating element, we discovered that by using two magnetic sheets and utilizing their mutual magnetic force, it was possible to manufacture a heating element filled with a desired amount of exothermic agent at a desired position within the inner bag. invention has been achieved.

That is, the present invention provides (1) a method for producing a heat generating element in which an exothermic agent containing metal powder and generating heat in the presence of air is sealed between two packaging materials, at least one of which is an air-permeable packaging material. hand,
The precursor of the exothermic agent is attached to the magnet sheet (A), and the adhesion is transferred to the magnet sheet (B) provided with the packaging material.
) is used to magnetically transfer the heating element onto the inner surface of the packaging material, and while the heating agent is retained, the heating element is formed, and then another packaging material is covered and sealed, and (2) metal In a method for producing a heating element, the heating element is sealed with two packaging materials, at least one of which is an air-permeable packaging material, in which a heating agent that contains powder and generates heat in the presence of air is sealed with a magnetic sheet (A). ), the attached material is magnetically transferred and held onto the inner surface of the packaging material using a magnetic sheet (B) provided with the packaging material, and then another packaging material is covered and sealed. This is a method for manufacturing a heating element.

The two magnetic sheets of the present invention can be appropriately selected depending on the method of use, the structure of the heating element, or the adsorption amount of the heating agent and its precursor, but usually they are made of rubber or plastic. Flexible multi-pole magnetized sheets of composite material are preferably used. Further, the magnetic properties of these two magnet sheets may be the same or different. The degree of orientation of the magnet, whether isotropic or anisotropic, is not particularly limited. The amount of magnetic transfer of the exothermic agent and its precursor can be arbitrarily adjusted by changing the magnetic properties of either or both of the magnetic sheets (A) and (B). Magnetic sheets are usually used as rotating or conveying structures. The magnet sheet may be in the form of a sheet with a uniform surface, or may be in the form of an uneven surface having cutouts of a desired shape.

The rotating structure is usually a drum-shaped rotating structure or a belt-shaped rotating structure with a magnetic sheet on its surface, and if necessary, a spray flapper is used to make the thickness of the adhesion layer of the exothermic agent or its precursor constant. Magnet sheet (A
) may be attached to the rotating structure.

The conveyance structure may be a simple conveyance unit or a connection unit in which a magnetic sheet is attached to a conveyance substrate, but it is preferably a structure that also serves as a cutting substrate in the heating element cutting process. For example, if a cutting blade is embedded in a conveyor board made of a sponge sheet, sheet, plate, and/or iron plate,
The heating element can be cut by directly conveying it to a cutting device such as a press roller or a press board.

The conveying means such as the conveying structure uses a device in which rollers are provided at both ends of a conveying line, so that the rollers support both ends of the conveying structure to facilitate conveyance.

If both are made into rotating structures, it is suitable for mass production, and if one is made into a rotating structure and the other is made into a conveying structure, it is suitable for small quantity production.

The exothermic agent of the present invention may be any composition that contains metal powder and generates heat in the presence of air, such as (a) metal powder such as iron powder, (b) water, and (c) halogen such as sodium chloride. Compositions containing oxidation aids such as metal salts or sulfates and water retention agents such as wood flour, vermiculite, activated carbon, and water-absorbing polymers as main components are applied, and inorganic salts as hydrogen generation inhibitors are applied. , a binder as a blending aid, a surfactant as an impregnation aid, etc. may be added.Preferably, a composition consisting of at least iron powder, water, a metal halide salt, and activated carbon is used. It will be done.

The precursor of the exothermic agent of the present invention is usually the exothermic substance described above, but it also contains most or all of the water and at least one selected from the group consisting of oxidation aids, inorganic salts, and surfactants.
The composition may be one in which most or all of the seed components are removed. Specifically, the precursor of the exothermic agent is (a) a composition consisting of at least iron powder and activated carbon, (b) a composition consisting of at least iron powder, activated carbon, and a small amount of water, and (C) a composition consisting of at least iron powder and a small amount of water. A composition consisting of water, activated carbon and a metal halide salt or a binder, or (d) these (h) or (C)
Examples include a dried product of the composition, and preferably a dried product of a composition containing iron powder, hydrous activated carbon, and a metal halide salt. These dried products have good mixing of each component and are less likely to undergo deterioration during the production of the heating element.

The precursor of the exothermic agent is impregnated with water or an aqueous solution of at least one component selected from the group consisting of oxidizing agents, inorganic salts, and surfactants, that is, subjected to an exothermic agent formation treatment, and then removed in the presence of air. It becomes an exothermic agent that generates heat at the bottom. The method of impregnating with water or an aqueous solution is appropriately selected depending on the arrangement structure of the exothermic agent in the heating element, and is carried out using a spray method, a water injection device provided with a plurality of fine water injection ports, or the like.

According to the method of using a heat generating agent precursor as described above, deterioration of the heat generating agent due to contact with air can be minimized and the be effective.

The two packaging materials that cover and seal the exothermic agent to form the heating element are selected from non-breathable packaging materials and breathable packaging materials, and at least one of them is made of a breathable packaging material.

The breathable packaging material is a packaging material that controls the supply of air to the exothermic agent or the adjustment of its supply rate, and includes (a) nonwoven fabrics, (b) porous sheets (trade name: NF Receipt manufactured by Tokuyama Soda), (trade name: Cellbore (Tanesui Kagaku 11), trade name: Breslon (manufactured by Nitto Denko), etc.) or a laminated sheet of porous sheets and nonwoven fabric, (c) nonwoven fabric.

(d) A laminated sheet made of a plastic film laminated with holes mechanically perforated with a blade, or (d) A nonwoven fabric or porous sheet laminated with a plastic film with pre-stamped ventilation holes. .

Particularly preferable specific examples include porous sheets having appropriate air permeability that serve as sheet-like heating elements, laminated sheets of the porous sheets and nonwoven fabric, or sheets made by laminating polyethylene fibers under heat and pressure. Examples include a breathable sheet (trade name: Tyvek (manufactured by DuPont)). If such a breathable packaging material is used, it can be used as a sheet heating element.
Flexible to fit along the curves of the body,
Not only is there no powder leakage of the exothermic agent, it is also possible to prevent the exothermic agent from moving or becoming unbalanced without requiring any structural or physical means such as dividing the exothermic agent storage section or using a holding material. That is, it is possible to form a flexible sheet-like heating element in which the heating agent is sandwiched between two packaging materials.

The non-breathable packaging material may be a conventionally used composite packaging material whose inner surface is comprised of a sealant film, but it usually has an adhesive layer on its inner surface to facilitate sealing with the breathable packaging material. An adhesive sheet is used.

When using conventionally used composite packaging materials, sealing is performed by heat sealing.

The adhesive sheet consists of an adhesive layer and a base sheet, and the base sheet is usually a single or mixed nonwoven fabric selected from polyethylene, polypropylene, polyester, nylon, rayon, valve, etc. , or dry or wet nonwoven fabric. Among these, polyester-based or polyolefin-based nonwoven fabrics are preferably used because they are thin, soft, and have a good texture. Depending on the structure and purpose of the heating element, a single or composite sheet selected from porous sheets, sponge sheets, foam sheets, plastic films, etc. may be used as a packaging material with good feel, including non-woven fabric. . Furthermore, on their surface or inside,
A functional material such as a thermochromic material or a far-infrared emitting substance may be added thereto.

The adhesive layer may be provided by applying a rubber-based, acrylic-based, or vinyl acetate-based adhesive to the entire surface or a desired area, or may be formed using a double-sided adhesive sheet, such as nonwoven fabric, paper, plastic film, or the like. Sheets having adhesives on both sides or inside of a base material such as plastic foam may also be used. The thickness of the double-sided adhesive sheet is usually 1
The thickness is preferably 0.5 mm or less, particularly 0.5 mm or less, and those based on nonwoven fabric or paper are preferred because their flexibility and stretchability are maintained.

When either the inner layer of the above-mentioned base material sheet or the base material of the double-sided pressure-sensitive adhesive sheet is composed of a thick base material of 1 to 5 mm, such as plastic foam, an inner layer containing a plastic foam layer is desired. It is also possible to use the hollowed-out part as a heating agent storage part.

In the manufacturing method of the present invention, it is possible to use a magnet sheet having a cutout portion of a desired shape and a sheet-like magnet sheet, and to make at least one of them a rotating structure, and magnetic transfer by two magnet sheets. Since it utilizes the heat generating agent, it is possible to disperse the exothermic agent within the rental space according to its shape.

Next, one preferred embodiment of the method of the present invention will be explained with reference to the drawings.

Figures 1 to 7 show a method for manufacturing a sheet-like heating element when the magnetic sheet (A) of the present invention is used as a rotating structure, the magnetic sheet (B) is used as a conveying structure, and a precursor of a heating agent is used. FIG.

FIG. 1 is a diagram illustrating a magnetic transfer process of magnetically transferring the exothermic agent precursor 1 onto the inner surface of the air-permeable packaging material 5. As shown in FIG. Also, Figure 2 shows the first
It is a side view of the conveyance structure 12 in a figure.

The conveyance structure 12 has a sponge sheet 7 pasted on a conveyance substrate 8 in which a cutting blade 9 is embedded, and a sheet-like rubber magnet (trade name: Plastiform (produced by Shimozam Seisakusho Co., Ltd.)) is attached to the outer surface of the sponge sheet 7.
) cut out into the desired shape (B
) 6 is attached, and the breathable packaging material 5 is further fixed with a stacking fastener lO, and both ends of the conveyance board 80 are attached with rollers 11.
is supported and conveyed to the magnetic transfer process.

On the other hand, the rotating structure of the magnet sheet (A) 3 is a drum-shaped rotating structure in which a sheet-like rubber magnet is directly stretched on the surface of the drum 2. This rotating structure is brought into contact with the exothermic agent precursor 1, and an adhesion layer 4 of a constant thickness of the precursor 1 is always formed on the surface of the rotating structure, and the conveying structure 12 is conveyed and brought into close proximity to the rotating structure. Then, the exothermic agent precursor 1 is magnetically transferred onto the inner surface of the air-permeable packaging material 5 to a certain thickness in a desired shape.

FIG. 3 shows a reversing device 13 for the conveying structure 12 that has undergone the magnetic transfer process. The reversing device 13 has a storage section 14 in which the conveying structure 12 supported by the rollers 11 can be taken in and out.
By rotating the conveying structure by 80 degrees, the vertical direction of the conveying structure is reversed.

FIG. 4 is a diagram of a heat generating agent forming treatment step in which the heat generating agent precursor 1 on the inverted conveying structure 12 is impregnated with water or an aqueous solution 17 of inorganic salts. Water or aqueous solution of inorganic salts 17
The impregnation is performed by a water injection device 15 provided with a plurality of fine water injection ports 16 in accordance with the arrangement of the exothermic agent precursor 1.

FIG. 5 shows the conveying structure 1 obtained in the exothermic agent forming process.
2 is a diagram illustrating a sealing process of covering and sealing the exothermic agent 19 on the wafer 2 with a packaging material provided with an adhesive layer on the inner surface. FIG.

FIG. 6 and FIG. 7 show the conveying structure 12 after the sealing process.
Lay another substrate such as vinyl chloride board 21 on top,
It is a figure of the cutting process which conveys to the press roller 20 and cuts into the heat generating body 22 of a predetermined shape.

A heating element is manufactured through the above steps, but if a heating agent is used instead of a heating agent precursor, the heating agent forming treatment step shown in Figure 4 is omitted, and the entire process is performed under a nitrogen atmosphere. Preferably, it is carried out in

FIG. 8 and FIG. 9 are diagrams showing other embodiments of the method of the present invention, and both are diagrams showing the magnetic sheet (A) of the present invention.
and a method for continuously producing a heat generating element in which the magnet sheet (B) is used as a rotating structure and a precursor of a heat generating agent is used.

In FIG. 8, the magnet sheet LA, ) 3 is a drum-shaped rotating structure device as shown in FIG. This is a belt-like rotating structure attached to an endless belt having cutting blades. In the magnetic transfer step 23 in which the magnet sheet (A) 3 and the magnet sheet (B) 6 to which the exothermic agent precursor is attached are brought into close proximity, the breathable packaging material 5 is intermittently placed on the magnet sheet (B).
) Supply to 6. The exothermic agent precursor 1 is magnetically transferred and held onto the air-permeable packaging material 5 by the magnet sheet (B) 6. The breathable packaging material 5 holding the exothermic agent precursor 1 and the magnetic sheet (B) 6 are rotated together, and the exothermic agent forming process 24, the sealing process 25, and the cutting process 26 are sequentially carried out.
A heating element is manufactured through this process. In addition, 27 is a press roller.

FIG. 9 is a diagram showing another magnetic force transfer step in the manufacturing method of FIG. 8, in which the magnet sheet (A) is used as an endless heald-like rotating structure.

In the manufacturing method shown in FIGS. 8 and 9, when a heat generating agent is used instead of the heat generating agent precursor, the heat generating agent forming treatment step is omitted and the entire process is performed under a nitrogen atmosphere. is preferred.

[Effects of the Invention] According to the manufacturing method of the present invention, since the magnetic transfer of the exothermic agent and the precursor of the exothermic agent using two magnetic sheets is used, there is no dust generation in the filling process. In a sanitary manner, it is possible to easily industrially manufacture a heating element in which a desired amount of heating agent is dispersed in a uniform thin layer at a desired position within the inner bag. Since the exothermic agent is fixed by the magret sheet during the sealing process, there is no sealing failure, making it easy to manufacture the exothermic element even on an industrial scale.

[Brief explanation of the drawing]

1 to 7 are diagrams showing a manufacturing method in which the magnet sheet (A) of the present invention is used as a rotating structure, the magnet sheet (B) is used as a conveying structure, and a precursor of a heat generating agent is used, FIG. 1 is a diagram showing the magnetic transfer process, and FIG. 2 is a side view of the conveying structure in FIG. 1. FIG. 3 is a diagram showing an inverted R position, and FIGS. 4 to 7 are diagrams showing a heating agent forming process, a sealing process, and a cutting process, respectively. Moreover, FIGS. 8 and 9 are diagrams showing another manufacturing method of the present invention, in which the magnet sheet (A) and magnet sheet (B) of the present invention are used as rotating structures, and a precursor of a heat generating agent is used. FIG. 2 is a diagram showing a continuous manufacturing method of a sheet-like heating element using a heating element. However, FIG. 9 is a partial diagram of the manufacturing method. The symbols in the diagram are as follows: 1. Exothermic agent precursor 2. Tram 3. Magnet sheet (A) 4. Adhesive layer 5. Breathable packaging material 6. Magnet sheet (B) 7. Sponge sheet 8. *Feeding Substrate 9, cutting blade 10, fastener 11. 12°13. 14. 15. 16. 17. 1B. 19. 20. 21. 22. 23. 24. 25. 26. 27. Roller conveyance structure Reversing device Storage section Water injection device Water injection port Water or noodle machine Salt aqueous solution coating Packaging material Exothermic agent Press roller Vinyl chloride plate Heating element Magnetic transfer process Exothermic agent formation processing process Sealing process Cutting process Press roller

Claims (1)

[Scope of Claims] 1. A method for manufacturing a heating element, in which a heating agent containing metal powder and generating heat in the presence of air is sealed with two wrapping materials, at least one of which is a breathable wrapping material. Then, the precursor of the exothermic agent is attached to the magnetic sheet (A), and the adhered matter is magnetically transferred to the inner surface of the packaging material using the magnet sheet (B) provided with the packaging material, and the exothermic agent is formed while being retained. A method for manufacturing a heating element, which comprises treating the heating element, and then covering it with another packaging material and sealing it. 2. A method for manufacturing a heating element in which a heating agent containing metal powder and generating heat in the presence of air is sealed between two packaging materials, at least one of which is an air-permeable packaging material, in which the heating agent is magnetized. The adhesive is attached to the sheet (A), the attached material is magnetically transferred and held onto the inner surface of the packaging material using the magnetic sheet (B) provided with the packaging material, and then another packaging material is covered and sealed. A method for manufacturing a heating element. 3. The exothermic agent precursor is (a) a composition consisting of at least iron powder and activated carbon, (b) a composition consisting of at least iron powder, activated carbon and a small amount of water, (c) at least iron powder, a small amount of water, and activated carbon. and a halogenated metal salt or a binder, or (d) a dried product of these (b) and (c) compositions, in which the exothermic agent forming treatment is performed using water, an oxidation aid, an inorganic salt, and a surfactant. 2. The method for manufacturing a heating element according to claim 1, wherein the impregnation treatment is performed with an aqueous solution of at least one component selected from the group consisting of: 4. Magnet sheet (A) and magnet sheet (B
) is a sheet with a flexible multi-polar magnetized structure, one of which is cut out into a desired shape and the other of which is in the form of a sheet, and at least one of which is a rotating structure. A method for producing a heating element according to any one of the above. 5. The method for producing a heating element according to any one of claims 1 to 4, wherein the breathable packaging material is a porous sheet or a laminated sheet of a porous sheet and a breathable sheet. 6. The method for manufacturing a heating element according to any one of claims 1 to 5, wherein the other packaging material has an adhesive layer provided on its inner surface.