JP2001071402A - Long-sized laminate for manufacturing heating element - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a long-sized laminate for manufacturing a heating element causing almost no damage by a cutter for cutting a laminate by structuring the laminate of intermittently formed heat-generating layers. SOLUTION: The long-sized laminate 1 is formed of a fiber layer 2, a heat- generating layer 4 and a coating layer 5. The fiber layer 2 is of a long and fibrous substance capable of retaining an electrolytic solution and is constituted of a long and fibrous layer 2a for retaining a shape located on the outside and a fibrous layer 2b which can be impregnated with the electrolytic solution. In addition, the heat-generating layer 4 is formed between the fibrous layer 2 and the coating layer 5 and comprises powder and grains containing a heat- generating principal material and a heat-generating assistant for adjusting a heat-generating reaction as main components. Each of the heat-generating layers 4 is of the same shape and the same size and is intermittently provided at a specified interval in the longer direction of a first fibrous layer 2a. Thus damage by a cutter for cutting is minimized by cutting the long-size laminate 1 at a specified velocity and every specified time and the laminate 1 which can be inserted into a bag can be efficiently manufactured.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a long laminated body for producing a heating element used for producing a sheet-shaped heating element which can be used for a disposable body warmer or the like. The present invention relates to a long laminated body for producing a heating element which can be used for producing a thin and flexible sheet-shaped heating element without deviation.

[0002]

2. Description of the Related Art There has been known an exothermic composition which generates a chemical reaction by bringing it into contact with oxygen in the air and utilizes the heat of the reaction. Examples of the exothermic composition include a mixture of an exothermic main agent such as a metal powder such as iron and aluminum with a reaction aid such as activated carbon, an inorganic electrolyte, and water.

[0003] These exothermic compositions are provided with air permeability by providing holes in an air-permeable sheet or a non-air-permeable sheet capable of supplying an amount of air necessary for the exothermic composition to generate heat by a chemical reaction. It is used as a heating element when housed in a bag made of a sheet or the like. When used as a disposable body warmer, such a heating element is widely used because of its simple usage and easy handling, and further demand is expected in the future.

However, when the heating element is used as a warming device such as a disposable body warmer, the heat-generating composition is shifted below the bag by the action of gravity and changes shape as time passes. Was something. As a result, the conventional heating element has a disadvantage that the adhesion to the human body is deteriorated and the calorific value is reduced too quickly.

For the purpose of preventing such a heat-generating composition from agglomerating and unevenly distributed, a heat-generating sheet-shaped heat-generating body capable of uniformly dispersing and maintaining the heat-generating composition and having a flexibility has been proposed (Japanese Patent Publication No. Hei 4 (1994)). No. 59904). Japanese Patent Application Laid-Open No. 8-112303 proposes a method for manufacturing a sheet-like heating element.

[0006] JP-A-8-112303 discloses that
A nonwoven fabric b is superimposed on the lower surface of the nonwoven fabric a having a large number of voids using an adhesive, and the exothermic composition is sprayed on the surface of the nonwoven fabric a to be held in the voids. It describes an invention of a method in which the mixture is heated and compressed by a mold compressor and then impregnated with water or an aqueous solution of an inorganic electrolyte. According to this method, it is possible to obtain a sheet-like heating element which is flexible and in which the heat-generating composition is uniformly dispersed and held.

[0007] However, the above method employs a means in which the exothermic composition is sprayed on a long nonwoven fabric so that the exothermic composition is held in voids. Therefore, in the long laminate obtained by such a method, the exothermic composition was present as a continuous layer on the surface or inside the nonwoven fabric.

In order to obtain a heating element having a shape and a size according to the purpose of use from such a long laminate, the long laminate must be cut together with a heat-generating composition containing a metal such as iron powder. Therefore, in the conventional method for manufacturing a sheet-like heating element, the cutter is severely damaged, and the amount of work and cost for replacing the cutter are enormous.

[0009]

SUMMARY OF THE INVENTION The present invention relates to a long laminated body used in the production of a sheet-type heating element having excellent flexibility and heat retaining performance, wherein the heating element has very little damage to a cutting cutter. An object is to provide a long laminate for manufacturing.

[0010]

A long laminate for producing a heating element according to the present invention comprises a long fiber layer capable of holding an electrolyte solution;
A long laminated body for producing a heating element, wherein a heating layer is provided between a long covering layer and the heating layer, wherein the heating layer is provided intermittently.

It is preferable that the long fiber layer is composed of a long fiber layer for holding a shape positioned outside and a fiber layer which can be impregnated with an electrolyte solution. It is preferable that the fiber layers are provided intermittently at regular intervals in the longitudinal direction of the fiber layer.

The long laminated body for producing a heating element of the present invention is provided with a heat-sealing portion layer made of heat-fusible fibers between the long fiber layer and the heat-generating layer. Is preferred.

[0013] In the long laminate for producing a heating element of the present invention, the long coating layer includes a heat-sealing portion layer made of heat-fusible fibers, a fiber layer impregnated with an electrolyte solution, It is preferable that a long fiber layer for maintaining the shape is provided in order from the inside.

The long fiber layer for maintaining the shape is preferably made of tissue, and the fiber layer that can be impregnated with the electrolyte solution is preferably made of pulp.

[0015]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a plan view showing an example of the present invention, and FIG. 2 is a longitudinal sectional view taken along line II-II in FIG. In FIG. 2, reference numeral 1 denotes a long laminated body for producing a heating element (hereinafter, referred to as “long laminated body”); 2, a long fiber layer capable of holding an electrolyte solution; 2b is a fiber layer (hereinafter, referred to as a "second fiber layer") that can be impregnated with an electrolyte solution.
, 4 represents a heat generating layer, and 5 represents a coating layer.

As the fiber layer 2 of the present invention, any long fiber that can hold an electrolyte solution can be used, but the long fiber layer 2 for holding the shape located outside is used.
a and a fiber layer 2b that can be impregnated with an electrolyte solution. With this configuration, it is possible to obtain a long laminate having excellent electrolyte holding power, flexibility, and appropriate strength.

As the material of the long first fiber layer 2a, cotton such as vegetable fiber and regenerated fiber, paper, filter paper, tissue or non-woven fabric composed of chemical fiber can be used. It is preferable to use a tissue. When the first fiber layer 2 is made of a tissue, when an electrolyte solution such as a saline solution is sprayed on the first fiber layer 2a, the electrolyte solution can be quickly absorbed without water repellency.
In addition, a tissue has a basis weight of 10 to 20 g / having a wet strength with kraft pulp or rayon as a main component.
It refers to a tissue paper of m ^2.

The basis weight of the first fiber layer 2a is preferably 10
１５０150 g / m ² , more preferably 20-100 g / m ²
It is. If the basis weight is less than 10 g / m ² , there is a possibility that the strength for maintaining the shape as a long laminate cannot be obtained. If the basis weight exceeds 150 g / m ² , flexibility may be lost.

As the material of the second fiber layer 2b, fibers having excellent water absorption such as pulp, cotton, viscose rayon, and water-absorbing chemical fiber can be used. It is preferable to use excellent pulp. The second fiber layer 2b is formed by using these materials,
It is configured as a structure having many voids.

The thickness and basis weight of the second fiber layer 2 b
The thickness is suitably determined in accordance with the amount of porosity and the porosity of the second fiber layer 2b, but the preferred thickness is 0.5 to 15 mm, and the more preferred thickness is 1 to 10 mm. If the thickness of the second fiber layer 2b is less than 0.5 mm, it may not be possible to obtain sufficient electrolyte solution holding capacity, and if the thickness exceeds 15 mm, the flexibility may be lost. Also, the second fiber layer 2b
Is preferably from ^{20 to} 200 g / m ² , and more preferably from 30 to 150 g / m ² . The basis weight is 20 g /
If it is less than m ^2, it may not be possible to obtain a sufficient ability to hold the electrolyte solution, and if the basis weight exceeds 200 g / m ² , it may be heavy and lose flexibility.

The second fiber layer 2b is preferably impregnated with an electrolyte solution. The electrolyte solution refers to an aqueous solution of the electrolyte, and has a function as a reaction assistant in the above oxidation reaction. Examples of the electrolyte include sodium chloride, potassium chloride, calcium chloride, magnesium chloride and the like, and sodium chloride which is easily available and easy to handle is preferable.

The second fiber layer 2b, it is preferable that the electrolyte solution 600~5000g / m ² was impregnated against basis weight of 100 g / m ^2. If the amount of the electrolyte solution is less than 600 g / m ² , the desired heat generation temperature and heat generation time may not be obtained. If the amount exceeds 5000 g / m ² , the water content is too large and the desired heat generation temperature cannot be increased. There is a possibility that it cannot be obtained.

In the present embodiment, a long fiber layer 2 capable of holding an electrolyte solution is composed of a first fiber layer 2a for maintaining a shape and a second fiber layer 2 capable of impregnating the electrolyte solution.
b, the fiber layer 2 is not limited to the present embodiment as long as it is long and can hold the electrolyte solution.

The heat generating layer 4 of the present invention is provided between the fiber layer 2 and a coating layer 5 described later. The heat-generating layer 4 is made of a powder containing a heat-generating agent and a heat-generating auxiliary agent for controlling an exothermic reaction as main components. Examples of the heat generating agent include reduced iron powder, atomized iron powder, potato iron powder, and the like. However, the present invention is not limited to these, and any substance can be used as long as it easily reacts with oxygen in the air and generates heat during the reaction.

Activated carbon is preferably used as the exothermic auxiliary, and a water-retaining agent such as silica, vermiculite, a water-absorbing polymer, or wood flour may be added. Examples of the activated carbon include coconut shell activated carbon, wood flour coal, coal, coke coal, bituminous coal, peat, and the like. Examples of the water-absorbing polymer include sodium polyacrylate and crosslinked polyacrylate.

The amount of the heat generating layer 4 is appropriately determined according to the desired heat generating performance and the thickness of the heat generating element, but is preferably 500 to 10000 g / m ² , more preferably 1000 g / m ² .
５5000 g / m ² . The amount of the heat generating layer 4 is 500 g /
If it is less than m ² , the heat generation temperature and the duration of heat generation decrease, and if it exceeds 5000 g / m ² , the heat generating element as a final product may be too thick to obtain a thin and flexible heat generating element. is there.

In the present invention, as shown in FIGS. 1 and 2, the heat generating layer 4 is provided intermittently. The heat generating layer 4 configured as described above is scattered on the fiber layer 2 in a discontinuous state. Therefore, the heating layers 4 are formed corresponding to the shape and size of the desired heating element, and each heating layer 4 is formed.
If the long laminate 1 is cut to be larger than its periphery every time, a laminate which does not have the heat generating layer 4 on its periphery and can be inserted into the bag can be obtained.

Each of the heat generating layers 4 preferably has the same shape and the same size, and is preferably provided intermittently at regular intervals in the longitudinal direction of the first fiber layer, as shown in FIG. It is more preferable to align the positions of the ends of the heat generating layers 4 in the width direction. When a plurality of rows of the heating layers 4 are provided in the width direction of the first fiber layer, as shown in FIG. 3, the positions of the ends of the heating layers 4 in the longitudinal direction and the width direction are aligned for each row. Is preferred. With this configuration, by cutting the long laminate 1 at a constant speed at regular intervals, a laminate that can be inserted into the bag can be efficiently manufactured.

The intervals between the heat generating layers 4 are different between a case where the cutting process is performed by using a one-character cutter or the like and a case where the cutting process is performed by using a die cut roll or the like.

When the cutting process is performed in such a manner as to separate the heat generating layers 4 from each other, the distance between the heat generating layers 4 in the longitudinal direction is set to 2.5 times the thickness of the heat generating layers 4 at the portion where the heat generating layers 4 are closest to each other.
Preferably, the interval is 5 to 10.5 mm when the thickness of the heat generating layer 4 is 2 to 3 mm.
It is preferable that The distance is equal to the thickness of the heat generating layer 4.
If it is less than 5 times, the heat generation layer 4 will break when the front and rear heat generation layers collapse.
May be in a continuous state, and it may not be possible to provide the heat generating layer 4 intermittently. If it exceeds 3.5 times, the packaging material may be wasted. The distance between the heat generating layers 4 in the width direction is the same as the distance between the heat generating layers 4 in the longitudinal direction.

In the case of the above punching mode, the heating layer 4
The distance in the longitudinal direction is 5 to 10 mm, more preferably 7 to 10 mm, than in the case where the cutting process is performed in the above-described cutting mode.
By increasing the length by mm, it is necessary to secure the width of the punched remaining portion. The same applies to the interval in the width direction.

The plane cross section of each heat generating layer 4 is not particularly limited, but is preferably circular, rectangular, or rhombic. When the heat generating layer 4 is configured in this manner, a sheet-shaped disposable body warmer having a shape that is easy to use can be obtained using the long laminate 1 of the present invention. Note that the circle includes an ellipse, and the rectangle includes a square, a rectangle, and a trapezoid, and includes a rectangle whose corners are rounded or cut off. Further, by forming a shape of a toe by combining a curve and a straight line, the heat generating layer 4 for keeping the toe warm used in a shoe can be used.

In the above, the case where one heat generating layer is provided has been described. In the present invention, a plurality of heat generating layers 4 may be provided. For example, two heat generating layers 4 may be provided and an electrolyte solution can be impregnated therebetween. By providing a fiber layer, it can be configured as a heating layer.

The long coating layer 5 of the present invention can be used as long as it can cover the heat generating layer 4. For example, a structure similar to that of the fiber layer 2 can be used, or a plastic film or the like can be used.

As shown in FIG. 4, the long laminated body 1 of the present invention comprises a heat-sealing portion layer 7 made of heat-fusible fibers between the long fiber layer 2 and the heat generating layer 4. Is preferably provided. With this configuration, the heat-sealing portion layer 7
Is melted, and the heat generating layer 4 is
The heat generation layer 4 can be held by surrounding the powder and granular material comprising the heat generation main agent and the heat generation auxiliary agent.

It is preferable to use a heat-fusible fiber made of polyester, polyethylene, polypropylene, or the like as the heat-sealing portion layer 7, and it is more preferable that polyester or polyethylene has a low melting point and is easily melted. Also, with a core of high melting point fiber such as polypropylene,
A fiber coated with a low melting point polyethylene or the like, which is easily heat-sealed, may be used. However, the present invention is not limited to the heat fusible fiber, and the heat fusible portion layer 7 may be made of powder or particles of a heat fusible resin such as polyethylene and polypropylene.

The long coating layer 5 of the present invention can be made of any material as long as it can cover the heat generating layer 4. The coating layer 5 of the present invention is made of a heat-sealing fiber made of heat-fusible fiber. A part layer 8, a fiber layer 9 capable of holding an electrolyte solution (hereinafter, referred to as a "third fiber layer"), and a fiber layer 10 for maintaining a shape (hereinafter, referred to as a "fourth fiber layer"). Are preferably provided in order from the inside as shown in FIG.

The heat-sealing portion layer 8 is provided inside the coating layer 5, that is, on the side in contact with the heating layer 4. The heat-sealed portion layer 8
Are heated and pressurized to melt and surround a powdery material composed of a heat-generating main agent and a heat-generating auxiliary, thereby forming a heat-generating layer 4.
Hold. The structure of the heat-sealed portion layer 8 is the same as that of the heat-sealed portion layer 7. In the present invention, as shown in FIG. 5, it is more preferable to provide the heat-sealing portion layer 7 and the heat-sealing portion layer 8 on both upper and lower surfaces of the heat generating layer 4. With this configuration, the heat generation layer 4 can be held more firmly.

When the covering layer 5 is provided with the third fiber layer 9 capable of holding the electrolyte solution, when the long laminate 1 is cut and used as a heat-generating sheet, the second fiber layer 2b is formed. Since the third fiber layer 9 also holds and supplies the electrolyte solution together with the electrolyte solution to be held and supplied, more stable heat generation performance is exhibited.

Further, it is preferable to provide the fourth fiber layer 10 on the coating layer 5 since the shape can be maintained by the fourth fiber layer 10.

The preferred embodiment of the long coating layer 5 has been described above. However, the long coating layer 5 of the present invention is not limited to the above-described embodiment, but may be any one as long as the heating layer 4 can be covered. But can be used. For example, a plastic film may be used, or the third fiber layer 9 may be omitted.
Can also be configured.

After the fibrous layer 2, the heat generating layer 4, and the coating layer 5 are formed, the long laminated body 1 of the present invention is subjected to a pressure treatment, an electrolyte solution impregnation treatment, and a cutting treatment to form a heat generating sheet. .

As the above-mentioned pressure treatment, for example, a pressure treatment for compressing the long laminated body 1 using an embossing roll having an embossed pattern formed on the outer peripheral surface can be mentioned. When the pressure treatment is performed, the granular material including the heat generating agent and the heat generating auxiliary constituting the heat generating layer 4 is fixed in the voids of the second fiber layer 2b and the third fiber layer 9 and is held without being unevenly distributed. .

When the long laminated body 1 of the present invention includes the heat-sealed portion layer 7 or the heat-sealed portion layer 8, it is preferable to perform a heating and pressing treatment. The heating and pressurizing treatment can be performed, for example, by using an embossing roll having an embossed pattern formed on the outer peripheral surface and having a heating function.

The long laminate 1 of the present invention is prepared by spraying an electrolyte solution such as a saline solution as a heating aid at any stage before inserting the cut laminate into the bag. An impregnation process is performed. By performing the treatment, the electrolyte solution is impregnated and held in the second fiber layer 2b and the third fiber layer 9, so that an effective oxidation reaction can be generated in the heat generation layer 4.

The cutting process of the long laminate 1 of the present invention is performed by cutting using a slitter, a one-letter cutter, a die-cut roll, trimming or the like. Heat generation layer 4
It is preferable to use a slitter, a one-letter cutter or the like if the shape is enclosed by a rectangle or a straight line, and it is preferable to use a die cut roll or trimming if the heating layer 4 is circular or oval. When the layer 4 has a shape surrounded by a curve and a straight line, cutting can be performed by combining a die cut roll, trimming, or the like with a slitter, a one-character cutter, or the like.

The long laminated body 1 of the present invention is subjected to each of the above-described treatments to form a heat-generating sheet, and then inserted into a breathable bag to form a heating element for a sheet-shaped disposable body warmer.

An example of a method for manufacturing the long laminate 1 of the present invention will be described with reference to FIG. In FIG. 6, 21 is a first fiber layer supply roll, 22a, 22b, 22c are guide rolls, 23 is a drop type second fiber layer supply device, 2 is
Reference numeral 4 denotes a laminate of the long first fiber layer 2a and the second fiber layer 2b; 25, a guide roll; 26, a heating layer supply roll; 27, a recess formed in the heating layer supply roll;
Reference numeral 8 denotes a heating layer supply hopper, 29 denotes a powder or granule comprising a heating agent and a heating auxiliary constituting the heating layer 4, 30 denotes a scraper, 31 denotes a dropping type third fiber layer supply device, 3 denotes
2 is a fourth fiber layer supply roll, 34 is an embossing roll for pressurizing treatment, 35 is an apparatus for spraying an electrolyte solution such as saline, 36 is a slitter with a built-in cutter, 38
Indicates a heat generating sheet. The shape and size of the concave portion 27 are appropriately determined according to the desired shape and amount of the heat generating layer 4.

The first fiber layer 2a is continuously supplied from the first fiber layer supply roll 21 through the guide roll 22a, and the pulp or the like constituting the second fiber layer 2b is supplied from the second fiber layer supply device 23 to the first fiber layer 2b. The first fiber layer 2a and the second fiber layer 2b are quantitatively supplied on the surface of the fiber layer 2a in a dropping manner.
Is formed. The heat generating layer supply roll 2 that rotates through the guide rolls 22b and 25
6 and rotates with the roll 26 in contact with the surface of the roll 26.

On the other hand, the heat-generating layer supply hopper 28 is provided with a granular material 29 composed of a heat-generating agent and a heat-generating auxiliary agent constituting the heat generating layer 4.
Are filled, and the powder 29 is formed by the heating layer supply roll 2.
6 is filled in a circular or rectangular recess 27 by a dropping method. The granular material 29 filled in the concave portion 27 rotates in a state of being covered with the heat generating layer supply roll 26 while being in contact with and covered by the laminate 24.
Is separated from the heat generating layer supply roll 26, the heat generating layer 4 is formed from the recess 26 by the action of gravity.

When the heat generating layer 4 is formed in this manner, the heat generating layer 4 is formed intermittently on the surface of the laminate 24, and only the first fiber layer 2a and the second fiber layer 2b are interposed between the heat generating layers 4. Thus, a portion where the heat generating layer 4 does not exist is formed.

The powder 29 adhered to the surface of the heating layer supply roll 26 is scraped off on the surface of the roll 26 by a scraper 30 provided between the heating layer supply hopper 28 and the guide roll 25. .

On the other hand, a long fourth fiber layer 6 is supplied from the fourth fiber layer supply roll 32, and the third fiber layer 6 is dropped from the third fiber layer supply device 31 onto the long fourth fiber layer 6. The pulp or the like constituting the layer is quantitatively supplied to form the long coating layer 5. The long coating layer 5 is supplied through the guide roll 2c, and is laminated with the laminate having the heat generating layer 4 formed on the surface of the laminate 24, thereby forming the long laminate 1.

However, the above manufacturing method is an example of the manufacturing method of the long laminate 1 of the present invention, and the present invention is not limited to this.

The long laminate 1 thus formed is subjected to a pressure treatment by an embossing roll 34, an electrolyte solution impregnation treatment by an electrolyte solution spraying device 35, and then a slitter 36 with a built-in cutting cutter. Is cut into individual heat generating layers 4 to form heat generating sheets 38.

FIG. 7 shows a plan view of the heat-generating sheet 38. As shown in FIG. 7, the heat generating sheet 38 obtained by cutting the long laminate 1 of the present invention has a peripheral portion 39 composed of the fiber layer 2, the coating layer 5, and the heat-sealing portions 7 and 8. Therefore, the heat generating layer 4 does not exist in the peripheral portion 39.

The exothermic sheet 38 is inserted into a bag and used as a heating element. FIG. 8 shows an example of the configuration of the heating element.
It will be described based on FIG. FIG. 8 is a longitudinal sectional view of the heating element. In FIG. 8, reference numeral 41 denotes a heating element, 42 denotes a bag,
Reference numeral 3 denotes a breathable sheet, 44 denotes a non-breathable sheet, and 45 denotes a seal portion.

The bag body 42 includes a breathable sheet 43, a non-breathable sheet 44, and a seal part 45, and is formed in a space formed by the breathable sheet 43, the non-breathable sheet 44, and the seal part 45. The heat generating sheet 38 is stored.

The breathable sheet 43 has a function of wrapping and protecting the heat-generating sheet 38 and supplying air to the heat-generating layer, and is made of a gas-permeable film, paper, nonwoven fabric, synthetic fiber paper, or a perforated plastic film. Is done. Non-breathable sheet 44
Are heat-fusible synthetic resin films such as polyethylene and polypropylene, or polyvinylidene chloride, polyamide, nylon, metal-deposited films, metal oxide-deposited films, metal foil laminated films, EVOH (ethylene-vinyl alcohol copolymer) For example, a multilayer film in which a film such as a saponified ethylene / vinyl acetate copolymer) film and a heat-fusible film are bonded to each other is used. The seal part 45 is preferably formed by heat sealing, but an adhesive can also be used.

The heating element 41 is inserted into an air-impermeable outer bag made of a film of the same material as the air-impermeable sheet 44 and hermetically sealed in order to maintain heat-generating properties for a long period of time. Save as Cairo,
Can be sold and used.

[0061]

EXAMPLES Hereinafter, the present invention will be described in more detail with reference to examples. Example 1 using a long tissue (basis weight 18 g / m ^2, width 110 mm) as the first fiber layer, using the pulp as the second fiber layer, the reduced iron particle size 80 to 350 mesh as the heating composition Using a mixture of powder and coconut shell activated carbon at a weight ratio of 14: 1, a second fiber layer having a basis weight of 100 g / m ² was laminated on the surface of the first fiber layer using an apparatus of the type shown in FIG. On the surface of the second fiber layer, two rows of rectangular heating layers (basis weight 300 g / m ² , length 152 mm, width 106 m)
m) was formed intermittently so that each heat generating layer had an interval of 16 mm in the longitudinal direction and an interval of 8 mm in the width direction.

A third fiber layer having a basis weight of 100 g / m ² using the same pulp as the second fiber layer and a fourth fiber layer using the same tissue as the first fiber layer on the surface on which the heat generating layer was formed. Were laminated to obtain a long laminate of the present invention. Next, after performing pressure processing using an embossing roll, and further performing impregnation with an electrolyte solution by spraying salt water, the long laminate is cut into heat-generating layers to form a breathable bag. This was inserted into a sheet-shaped disposable body warmer.

Example 2 A first fiber layer and a second fiber layer were laminated in the same manner as in Example 1, and a polyolefin nonwoven fabric (basis weight 30 g / m ² ) was used on the surface of the second fiber layer of the laminate. Thus, a heat-sealing portion layer was formed, and a heat-generating layer was formed on the surface of the heat-sealing portion layer in the same manner as in Example 1.

On the surface on which the heat generating layer was formed, a heat-sealing portion layer was formed using a nonwoven fabric (basis weight 30 g / m ² ) using polyolefin fibers. In the same manner as in 1, the third fiber layer and the fourth fiber layer were laminated to obtain a long laminate of the present invention. Next, a heating and pressurizing process is performed using an embossing roll, and after a further impregnation process with an electrolyte solution is performed, the long laminate is cut into heat generating layers and inserted into a breathable bag. The heating element was a sheet-shaped disposable body warmer.

Comparative Example 1 Example 1 was repeated except that the heat generating layer was formed as a continuous body by spraying a powder comprising a heat generating agent and a heat generating auxiliary without using the heat generating layer supply roll.
The first fiber layer, the second fiber layer, the third fiber layer, and the fourth fiber layer were laminated in the same manner as described above to obtain a long laminate. Next, the long laminated body was subjected to embossing pressure processing in the same manner as in Example 1,
After being impregnated with the electrolyte solution, a long laminate was obtained. Next, the long laminated body was cut for each heating layer, and inserted into a bag to obtain a heating element for a sheet-shaped disposable body warmer.

Comparative Example 2 Example 2 was repeated except that the heat generating layer was formed as a continuous body by dispersing a powder comprising a heat generating agent and a heat generating auxiliary without using the heat generating layer supply roll.
In the same manner as in the above, a long laminate was obtained. Next, the long laminate was embossed under heat and pressure in the same manner as in Example 2,
After the impregnation treatment with the electrolyte solution, the long laminate was cut into heat-generating layers and inserted into a breathable bag to obtain a sheet-shaped disposable body warmer.

The long laminate for producing a heating element obtained in Examples 1 and 2 has no heating layer in a portion not used as a heat-generating sheet after cutting, ie, a portion to be discarded. Almost no waste of the powder and granules composed of the auxiliary agent occurred.

Further, in Examples 1 and 2, the cutter was hardly damaged and it was not necessary to replace the cutter for 6 months. However, in Comparative Examples 1 and 2, the cutter was severely damaged and was not changed once a month. It had to be replaced or polished.

[0069]

According to the present invention, there is provided a long laminate for producing a heating element, comprising a heating layer provided between a long fiber layer capable of holding an electrolyte solution and a long coating layer. Since the configuration in which the heat generating layer is provided intermittently is employed, it is possible to provide a long laminated body for manufacturing a heat generating element, in which damage to the cutting cutter is extremely small.

[Brief description of the drawings]

FIG. 1 is a plan view showing an example of a long laminate for producing a heating element according to the present invention.

FIG. 2 is a longitudinal sectional view taken along the line II-II in FIG.

FIG. 3 is a plan view showing an example of an embodiment of the present invention.

FIG. 4 is a longitudinal sectional view showing an example of the embodiment of the present invention.

FIG. 5 is a longitudinal sectional view showing an example of the embodiment of the present invention.

FIG. 6 is an explanatory view showing one example of a method for producing a long laminate for producing a heating element according to the present invention.

FIG. 7 is a plan view of a heat generating sheet.

FIG. 8 is a longitudinal sectional view of a heating element.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Long laminated body for heating element manufacture 2 Long fiber layer 2a 1st fiber layer 2b 2nd fiber layer 4 Heat generation layer 5 Coating layer 7 Heat fusion part layer 8 Heat fusion part layer 9 Third fiber layer 10 Four fiber layers

 ────────────────────────────────────────────────── ─── Continued on the front page F term (reference) 3E067 AA05 AA12 AB96 AB99 BA31A BB01A BB06A BB14A BB15A BB16A BB25A CA09 CA24 4F100 AJ04B AJ04D AS00C BA05 BA07 BA10A BA10E DG01A DG01B JJG GB12JJB12JJB12J

Claims (6)

[Claims] 1. A long laminate for producing a heating element, comprising a heating layer provided between a long fiber layer capable of holding an electrolyte solution and a long coating layer, wherein the heating layer is intermittent. A long laminated body for producing a heating element, wherein the laminated body is provided in a uniform manner. 2. The heating element according to claim 1, wherein the long fiber layer comprises a long fiber layer for maintaining a shape located outside and a fiber layer impregnated with an electrolyte solution. Manufacturing laminate. 3. A long laminated body for producing a heating element according to claim 1, wherein each of the heat generating layers is provided intermittently at regular intervals in the longitudinal direction of the long fiber layer. . 4. The heating element according to claim 1, wherein a heat-sealing portion layer made of heat-fusible fibers is provided between the long fiber layer and the heat-generating layer. For long laminates. 5. A long coating layer comprising: a heat-sealing portion layer made of heat-fusible fibers; a fiber layer impregnated with an electrolyte solution; and a long fiber layer for maintaining a shape. The long laminated body for producing a heating element according to claim 1, wherein the laminated body is provided in order. 6. The heating element manufacturing length according to claim 2, wherein the long fiber layer for maintaining the shape is made of tissue, and the fiber layer that can be impregnated with the electrolyte solution is made of pulp. Shaku laminate.