JPH07125780A - Food container with heating function - Google Patents

Abstract

PURPOSE:To maintain the safety of users so as to ensure them against burn by forming a self burning type ignition agent from a binder consisting of a water-soluble cellulose derivative. CONSTITUTION:An ignition line 6 is obtained by immersing a linear object such as carbon fiber in a water-soluble binder solution of ignition agent consisting of oxidizing and reducing agents and drying it. The ignition line 6 is so constructed as to ignite by a spark generating device 9 and hinder the exothermic reaction of an exothermic agent 4, unless it burns up to this agent. A water-soluble cellulose derivative is necessary as a binder for forming a self burning type ignition agent. By way of example, this cellulose derivative may be methyl cellulose and hydroxypropylmethyl cellulose. Under the moisture which can normally occur, the exothermic agent is normally ignited to generate heat and, in a case where an excessive amount of water intrudes into an exothermic body storing chamber 2, the exothermic reaction is hindered by decomposition of the composition of the ignition agent or loss of its shape.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a food container having a heat generating function using a self-combusting heat generating agent.

[0002]

2. Description of the Related Art A container having a heat generating function for heating a liquid food or drink enclosed in a container is well known in the prior art, for example, JP-A-4-102564.
Japanese Patent Laid-Open Publication, combining a self-combustion type exothermic agent, a self-combustion type ignition line for starting the reaction of the exothermic agent, a spark generator for igniting the ignition line, and a heat insulating agent for temperature control A technology for producing a food container with a heat generating function is disclosed.

[0003]

As described above, the use of the self-combustion type exothermic agent consisting of metal oxide and metal powder as the exothermic agent of the food container with the exothermic function is due to the hydration reaction type consisting of quicklime and water. Since the calorific value per unit weight is larger than that of the exothermic agent or the like, there is an advantage that the size and shape of the entire food container with a heat generating function can be reduced.

However, the combustion temperature during the reaction is 100
Since it is as high as 0 ° C or higher, if water exceeding the allowable limit is mixed during the reaction, not only high-temperature steam is generated, but also
Depending on the conditions, water may be decomposed to generate flammable hydrogen gas. In addition, as a possibility that water may be mixed in the exothermic agent, it is possible that the consumer accidentally drops it into water during use, but in this case the reaction starts with water mixed as described above. Moreover, the generation of high temperature steam may cause burns to consumers.

As a means for solving these problems, it is conceivable to make the portion accommodating the exothermic agent a waterproof structure or the like. However, completely sealing the inside causes a pressure rise caused by heat expansion of air. It is not preferable because it may damage the container. On the other hand, as a binder for molding a self-combustion type composition such as a heat-generating agent or an igniter used in a conventional food container with a heat-generating function into a constant shape, water resistance, moldability, ease of drying treatment and flammability are required. In consideration of this, it is general to use a solvent that dissolves in an organic solvent, and it has been judged that a water-soluble molding binder is not preferable from these points.

However, as a result of the earnest efforts of the present inventors, when the water is mixed by using this water-soluble molding binder, the combustion composition disperses or collapses its shape to cause the exothermic reaction. I found that it does not occur. That is, the present inventors first tried to use the water-soluble binder for the molding of the exothermic agent itself and the molding binder for the ignition agent, which was dissolved by the conventional organic solvent, in the present invention. But,
As a result, it has been found that the following problems occur.

Even if the ignition agent itself is mixed with water, there is a possibility that the original shape may be retained due to the water resistance of the molding binder used and the consumer may erroneously judge that it is usable. Further, when the mixed water becomes dry, it becomes ready to burn again, which may cause an exothermic reaction of the exothermic agent itself.
In this case, the mixed water may still remain inside, which is insufficient as a safety measure against burns and the like.

Further, it has been found that it is not preferable to mold the exothermic agent with a water-soluble binder having a high hydrophilicity, since it is difficult for the mixed water to repel water and the moisture absorption phenomenon is promoted. Therefore, the present inventors tried to form only the ignition agent with a water-soluble binder, and combine the formed ignition agent with an exothermic agent to form a heating element. The water mixed in from here not only disperses the combustion composition that is the composition of the igniting agent or collapses the shape of the igniting agent, and as a result not only can suppress the exothermic reaction, but also compared with the amount when the igniting agent is used as the igniting agent. The present invention has been accomplished by finding that the amount of water used for the heat treatment is small and therefore the effect of moisture contained in the moisture absorption phenomenon on the exothermic reaction is small.

[0009]

Means for Solving the Problems That is, the present invention provides a food container with a heat generating function including a self-combustion type exothermic agent, a self-combustion type ignition agent, and a spark generator, wherein the self-combustion type ignition agent is water-soluble cellulose. A food container with a heat generating function, characterized by being molded with a binder made of a derivative.

The present invention will be described in detail below. FIG. 1 is a view showing the overall structure of a food container with a heat generating function of the present invention.
Reference numeral 1 is a food container body with a heat generating function, and a metal container such as aluminum or iron is used as a material. 10 is a liquid food and drink, 2 is a heating element accommodating chamber, 3 is an inner cylinder, and the material is a metal such as aluminum or iron. This inner cylinder 3 has a heat insulating agent 5
Self-combustion type exothermic agent 4 and encapsulant 7 molded with aluminum foil
A member made of metal is further arranged, one end of which is in contact with the molded self-combustion type exothermic agent 4, and the other end of which penetrates the heat insulating agent 5, the encapsulating agent 7 and the flame-retardant encapsulating paper 11 and is made of metal. An ignition line 6 exposed through a hole provided in the lid 8 is attached. As will be described later, this ignition line is obtained by dipping a linear material such as carbon fiber in a water-soluble binder solution of an ignition agent composed of an oxidizing agent and a reducing agent and drying. A spark generator 9 is supported on the outside of the metallic lid 8 at a position facing the ignition line 6 exposed through the hole. By applying a spark from the spark generation device 9 to the ignition line 6, ignition is possible. That is, the ignition wire 6 is ignited by the spark generation device 9 and the exothermic reaction of the exothermic agent does not occur unless the exothermic agent 4 is burned.

The self-combustion type exothermic agent used in the present invention is
There is no particular limitation, and for example, JP-A-3-6832
Copper oxide as an oxidant, as disclosed in Japanese Patent No.
A composition composed of iron oxide and silicon iron as a reducing agent is used. As for the composition of the self-combustion type igniter, a composition which is more reactive than the composition of the exothermic agent and has a large amount of heat generated during the exothermic reaction is used. For example, JP-A-63-256
As disclosed in Japanese Patent No. 590, a composition such as lead oxide as an oxidizing agent and silicon iron as a reducing agent is used.

The binder for forming the self-combustion type ignition agent must be a water-soluble cellulose derivative, and examples thereof include methyl cellulose, carboxymethyl cellulose, hydroxypropyl methyl cellulose and the like. From the viewpoint of the degree of substitution of the cellulose derivative and the solubility in water, for example, in the case of methyl cellulose, the number of the three hydroxyl groups in each glucose group constituting the cellulose that is substituted with a methoxy group, that is, the degree of substitution is 1.3. Since those having a substitution degree of 1.6 to 1.9 are easily dissolved in water, those having a substitution degree of 1.6 to 1.9 have the highest solubility in water and are particularly preferable. Further, when it is used as an aqueous solution having an addition amount of 1% by weight to 5, a high-strength molded product can be obtained.

Although polyvinyl alcohol and water glass are water-soluble, polyvinyl alcohol having a degree of polymerization of about 500 to about 1500 is hardly soluble in water at room temperature,
In particular, those having a degree of polymerization of about 1500 are hardly soluble even when hot water at 75 ° C. is used, and there is a problem when used as a binder. Further, water glass needs to be added in an amount of 5% by weight or more in order to obtain a high-strength molded product, which reduces the flammability of the ignition line and is not preferable for use as a binder.

In addition, a molding binder other than a cellulose derivative cannot be said to be a preferable molding binder because it may have a slight offensive odor when it is burned. As a method for producing a molded article of the ignition agent of the present invention, for example, an oxidizing agent and a reducing agent are put into a liquid of a water-soluble cellulose derivative binder, and these are uniformly dispersed to prepare a self-combustion type ignition agent stock solution, and this solution There is a method of passing an inorganic fiber bundle such as glass fiber, carbon fiber, metal fiber, etc. through it and then drying it to form a linear ignition line.

The above-mentioned linear igniting agent, that is, the heating element composed of the ignition wire 6 and the self-combustion type heating agent 4 formed is disposed inside the inner cylinder 3 in the heating element housing chamber 2 and the heating element A heat insulating agent 5 is arranged in the entire circumferential surface space, and an encapsulating agent 7 is placed on the opening side thereof.
And a cover paper 11 is laid, and a lid 8 to which a lighter-type spark generator 9 is fixed is fitted and mounted on the opening side, and a liquid food / beverage 10 is stored in the food / beverage storage portion and sealed to generate heat. It becomes an attached food container.

[0016]

The present invention will be described with reference to examples. That is,
A method of producing an ignition line using various binders, a method of producing a food container with a heat generating function, an ignitability of the food container after absorbing moisture, an ignitability of the food container after immersion in water, and the like will be described.

[0017]

Example 1 Ignition wire manufacturing method: 14 g of lead tin manufactured by Lead-shi Chemical Co., Ltd. having a 200 mesh pass average particle size of 3 μm and silicon iron manufactured by Yakushima Electric Works Ltd. having a 200 mesh pass average particle size of 30 μm 6 g was weighed and mixed. Next, 10 g of a 1% by weight aqueous solution of methyl cellulose manufactured by Matsumoto Yushi-Seiyaku Co., Ltd. was weighed in a container. A mixture of red lead and silicon iron is put in this aqueous solution and uniformly dispersed, and carbon fiber (trade name: Hikerboron AT-400-12000) manufactured by Shin-Asahi Kasei Carbon Fiber Co., Ltd. is passed through the solution and taken out. The ignition line was obtained by evaporating the water.

Manufacturing method of food container with heat generating function: Particle size is 70 μm as a heat insulating agent from the inside in an aluminum inner cylinder.
30 g of a mixture consisting of 5% by weight of the following copper oxide powder and 95% by weight of silica sand having a particle size of 150 μm or less is filled, and a copper oxide powder 37 having a particle size of 70 μm or less is located at the opening side position.
27 g of a self-burning exothermic agent consisting of a mixture of 30% by weight of silicon iron powder having a particle size of 70 μm or less and 33% by weight of iron powder having a particle size of 150 μm or less is filled in an aluminum foil, and the outer diameter is 32 mm. A cylindrical shape of which is laid with an ignition line so as to stand in the center thereof, and is filled with 25 g of the heat insulating agent so as to cover the entire peripheral surface space adjacent to the exothermic agent, Further, 20 ml of vermiculite as an encapsulant is filled in the opening side, pressure is applied from the upper part at a pressure of 10 Kg / cm ² , and an encapsulating paper is laid on the opening side, and a lighter-type spark generation device is further provided in the opening part. Set the lid to fix the container, and fit it into the recess on the inner surface of the heating element storage chamber of the container body, as shown in Fig. 1, inject 180 ml of sake into the food and drink storage unit, and seal the food and drink. Lid Set, and the product sample was sealed using a seamed machine.

Ignition property of product sample after moisture absorption: After the product sample was left in an environment of a temperature of 30 ° C. and a relative temperature of 93% for 8 hours,
The thermo-hygrostat was turned off and left for 16 hours. This is set as one cycle, and after repeating 7 cycles, the rotor attached to the lighter-type spark generator is rotated, and the spark ignites the ignition line protruding about 2 mm outside the lid, and the exothermic agent is generated by the combustion propagation of the ignition line. Can be burned 10
It was possible to safely raise the temperature of sake at 50 ° C to 50 ° C. In addition, no irritating odor was observed when smelling at the time of ignition.

Ignition property of a product sample after immersion in water: After immersing the product sample in water for 5 seconds without a lighter-type spark generator attached to the product sample, the product sample was taken out and allowed to stand indoors for 3 days, and then a lighter-type spark Although the generator was attached and fixed and the rotor was rotated, the ignition line did not ignite.

[0021]

Example 2 Manufacturing method of ignition line: As in Example 1, 14 g of red lead and 6 g of silicon iron were weighed and mixed. Next, 20 g of a 3 wt% aqueous solution of medium viscosity type carboxymethyl cellulose manufactured by Dai-ichi Kogyo Seiyaku Co., Ltd. was weighed in a container. A mixture of red lead and silicon iron was put into this solution and uniformly dispersed, the same carbon fiber as in Example 1 was passed through the solution, taken out, and water was evaporated to obtain an ignition line.

Manufacturing method of food container with heat generating function: A product sample was obtained by the same manufacturing method as in Example 1 except that the above ignition line was used. Ignition property after moisture absorption of a product sample: After absorbing moisture under the same conditions as in Example 1 and repeating 7 cycles, the rotor attached to the lighter-type spark generator was rotated as in Example 1, so that the ignition line was ignited. Combustion of exothermic agent by combustion propagation of ignition line,
It was possible to generate heat and safely raise 10 ° C sake to 51 ° C. Also, when I smelled at ignition,
No pungent odor was observed.

Ignition property of product sample after immersion in water: Example 1
Same as above, after soaking in water for 5 seconds without a lighter-type spark generator attached to the product sample, remove the product sample and let it stand in the room for 3 days, then attach and fix the lighter-type spark generator to fix the rotor. It was rotated, but the ignition line did not ignite.

[0024]

[Example 3] Manufacturing method of ignition line: As in Example 1, 14 g of red lead and 6 g of silicon iron were weighed and mixed. Next, 10 g of a 2% by weight aqueous solution of medium-viscosity hydroxypropylmethylcellulose manufactured by Matsumoto Yushi-Seiyaku Co., Ltd. was weighed in a container. A mixture of red lead and silicon iron was put into this solution and uniformly dispersed, and the same carbon fiber as in Example 1 was passed through the solution and taken out.
The ignition line was obtained by evaporating the water.

Manufacturing method of food container with heat generating function: A product sample was obtained by the same manufacturing method as in Example 1 except that the above ignition line was used. Ignition property of a product sample after absorbing moisture: After absorbing moisture under the same conditions as in Example 1 and repeating 7 cycles, the rotor attached to the lighter-type spark generator was rotated to ignite the ignition line as in Example 1. It was possible to safely raise the temperature of sake at 10 ° C. to 50 ° C. by causing the exothermic agent to burn and generate heat by the propagation of combustion. In addition, no irritating odor was observed when smelling at the time of ignition.

Ignition Properties of Product Samples after Immersion in Water: Example 1
Same as above, after soaking in water for 5 seconds without a lighter-type spark generator attached to the product sample, remove the product sample and let it stand in the room for 3 days, then attach and fix the lighter-type spark generator to fix the rotor. It was rotated, but the ignition line did not ignite.

[0027]

[Comparative Example 1] Manufacturing method of ignition line: As in Example 1, 14 g of red lead and 6 g of silicon iron were weighed and mixed. Next, 10% of a 4% by weight acetone solution of 60 seconds nitrification cotton manufactured by Asahi Kasei Kogyo Co., Ltd. was placed in a container.
g was weighed. A mixture of red lead and silicon iron was put into this solution and uniformly dispersed, the same carbon fiber as in Example 1 was passed through the solution, taken out, and water was evaporated to obtain an ignition line.

Manufacturing method of food container with heat generating function: A product sample was obtained by the same manufacturing method as in Example 1 except that the above ignition line was used. Ignition property of a product sample after absorbing moisture: After absorbing moisture under the same conditions as in Example 1 and repeating 7 cycles, the rotor attached to the lighter-type spark generator was rotated to ignite the ignition line as in Example 1. It was possible to safely raise the temperature of sake at 10 ° C. to 50 ° C. by causing the exothermic agent to burn and generate heat by the propagation of combustion. However, an irritating odor was recognized when the odor was smelled at the time of ignition.

Ignition property of product sample after immersion in water: Example 1
Same as above, after dipping in water for 5 seconds without the lighter spark generator attached to the product sample, remove the product sample and let it stand in the room for 3 days, then attach the lighter spark generator and fix it When it was rotated, the ignition line ignited and heat generation started, so the lighter spark generator attached to the product sample was placed on the table with the side facing downward, and when the product sample was lifted 10 minutes after ignition, water droplets appeared on the table. It was attached, and the generation of water vapor was recognized.

[0030]

[Comparative Example 2] Manufacturing method of ignition line: As in Example 1, 14 g of red lead and 6 g of silicon iron were weighed and mixed. Next, 10 g of a 5 wt% aqueous solution of water glass manufactured by Katayama Chemical Co., Ltd. was weighed in a container. A mixture of red lead and silicon iron powder was put into this solution, uniformly dispersed, the same carbon fiber as in Example 1 was passed through the solution, taken out, and water was evaporated to obtain an ignition line.

Bending strength was measured using this ignition line. As a result, an ignition line having a length of 10 cm was placed horizontally between the bases, and 1 cm at each end of the ignition line was fixed at the midpoint of the ignition line. 1
It was found that when a weight of 00 g was attached to both ends of a cotton thread and hung across the weight, the ignition line was broken and a part of the ignition agent was peeled off, resulting in a problem in moldability. Therefore, the ignitability of the food container with a heat generating function after moisture absorption and the ignitability after immersion in water were not confirmed.

According to the bending strength measuring method described above, Examples 1 to
When the bending strength of the ignition line was measured also for No. 3 and Comparative Example 1, the ignition lines obtained in Examples 1 to 3 and the ignition line obtained in Comparative Example 1 were not broken, and the ignition agent was peeled off. Was not recognized.

[0033]

EFFECTS OF THE INVENTION The food container with a heat generating function of the present invention normally ignites and generates heat under the humidity that can normally occur, but when excessive moisture enters the heating element storage chamber, the ignition agent composition is Dispersion or collapse of shape can suppress exothermic reaction,
This has the effect of ensuring the safety of consumers against burns. Further, since the water-soluble cellulose derivative used for the molding binder of the ignition agent of the present invention does not contain a nitrogen component, it also has an effect of suppressing the generation of NOx gas during combustion of the ignition agent.

[Brief description of drawings]

FIG. 1 is a view showing an embodiment of a food container with a heat generating function of the present invention.

[Explanation of symbols]

 1 Food container body with heat generation function 2 Heating element storage chamber 3 Inner cylinder 4 Molded self-combustion type heat generating agent 5 Insulating agent 6 Ignition line 7 Encapsulating agent 8 Lid 9 Spark generator 10 Liquid food and drink 11 Encapsulating paper

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[Procedure amendment]

[Submission date] November 16, 1993

[Procedure Amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0010

[Correction method] Change

[Correction content]

The present invention will be described in detail below. FIG. 1 is a view showing the overall structure of a food container with a heat generating function of the present invention.
Reference numeral 1 is a food container body with a heat generating function, and a metal container such as aluminum or iron is used as a material. 10 the liquid food or drink, 2 heating elements retract and chamber, 3 is an inner cylinder, the material is aluminum, a metal such as iron is used. This inner cylinder 3 has a heat insulating agent 5
Self-combustion type exothermic agent 4 and encapsulant 7 molded with aluminum foil
A member made of metal is further arranged, one end of which is in contact with the molded self-combustion type exothermic agent 4, and the other end of which penetrates the heat insulating agent 5, the encapsulating agent 7 and the flame-retardant encapsulating paper 11 and is made of metal. An ignition line 6 exposed through a hole provided in the lid 8 is attached. As will be described later, this ignition line is obtained by dipping a linear material such as carbon fiber in a water-soluble binder solution of an ignition agent composed of an oxidizing agent and a reducing agent and drying. A spark generator 9 is supported on the outside of the metallic lid 8 at a position facing the ignition line 6 exposed through the hole. By applying a spark from the spark generation device 9 to the ignition line 6, ignition is possible. That is, the ignition wire 6 is ignited by the spark generation device 9 and the exothermic reaction of the exothermic agent does not occur unless the exothermic agent 4 is burned.

[Procedure Amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0012

[Correction method] Change

[Correction content]

The binder for forming the self-combustion type ignition agent must be a water-soluble cellulose derivative, and examples thereof include methyl cellulose, carboxymethyl cellulose, hydroxypropyl methyl cellulose and the like. From the viewpoint of the degree of substitution of the cellulose derivative and the solubility in water, for example, in the case of methyl cellulose, the number of the three hydroxyl groups in each glucose group constituting the cellulose that is substituted with a methoxy group, that is, the degree of substitution is 1.3. Since those having a substitution degree of 1.6 to 1.9 are easily dissolved in water, those having a substitution degree of 1.6 to 1.9 have the highest solubility in water and are particularly preferable. Further, when it is used as an aqueous solution having an addition amount of 1% by weight to 5 % by weight , a high-strength molded product can be obtained.

[Procedure 3]

[Document name to be amended] Statement

[Correction target item name] 0019

[Correction method] Change

[Correction content]

The product moisture after ignition of the sample: temperature 30 ° C. The product sample was of stripping 8 hours relative humidity 93% environment,
The thermo-hygrostat was turned off and left for 16 hours. This is set as one cycle, and after repeating 7 cycles, the rotor attached to the lighter-type spark generator is rotated, and the spark ignites the ignition line protruding about 2 mm outside the lid, and the exothermic agent is generated by the combustion propagation of the ignition line. Can be burned 10
It was possible to safely raise the temperature of sake at 50 ° C to 50 ° C. In addition, no irritating odor was observed when smelling at the time of ignition.

[Procedure amendment 4]

[Document name to be amended] Statement

[Name of item to be corrected] 0029

[Correction method] Change

[Correction content]

Ignition property of product sample after immersion in water: Example 1
When Similarly, after 5 seconds immersion product samples supplied lighters spark generating device is not shaped state in water, after 3 days allowed to stand indoors removed the product sample, and fixed by attaching a lighter type spark generator rotor When I turned, the ignition line ignited and heat generation started, so I placed it on the table with the lighter spark generator attached to the product sample facing downward, and after 10 minutes from ignition, when I lifted the product sample, water droplets fell on the table. Was adhered, and the generation of water vapor was recognized.

[Procedure Amendment 5]

[Document name to be amended] Statement

[Name of item to be corrected] 0032

[Correction method] Change

[Correction content]

According to the bending strength measuring method described above, Examples 1 to
Also in Example 3 and Comparative Example 1, when the breaking strength of the ignition line was measured, the ignition lines obtained in Examples 1 to 3 and the ignition line obtained in Comparative Example 1 were not broken, and the ignition agent was used. No peeling was observed.

[Procedure correction 6]

[Document name to be amended] Statement

[Correction target item name] 0033

[Correction method] Change

[Correction content]

[0033]

EFFECTS OF THE INVENTION The food container with a heat generating function of the present invention normally ignites and generates heat under the humidity that can normally occur, but when excessive moisture enters the heating element storage chamber, the ignition agent composition is Dispersion or collapse of shape can suppress exothermic reaction,
This has the effect of ensuring the safety of consumers against burns. Further, since the water-soluble cellulose derivative used in the binder for forming the ignition agent of the present invention does not contain a nitrogen component, it also has an effect of suppressing generation of NOx gas when the ignition agent is burned.

Claims (1)

[Claims] 1. A self-combustion type exothermic agent, a self-combustion type ignition agent,
A heat-generating food container including a spark generating device, characterized in that the self-combusting igniter is molded with a binder made of a water-soluble cellulose derivative.