JPH03123514A - Safe container with heating function - Google Patents

Abstract

PURPOSE:To prevent ignition of heat generating agent due to moisture or water absorption inside a heat generating agent housing part by arranging a layer of hydrate inflating agent on the heat generating room opening side of a heat generating agent layer. CONSTITUTION:In the innermost part of a heat generating agent housing, a layer of self-burning heat generating agent 1 is housed. On the opening side surface of the heat generating agent 1 layer, a hydrate inflating layer 5 is arranged, and on the further opening side, a heat insulative layer 2 is arranged. On the end surface of the heat insulative layer 2, a lid 4 is provided. The lid 4 has a hole to let a certain length of fuse 3 to pass through so that it can form an ignition head 3a of a size suitable for ignition. The fuse 3 extends just before the end surface of the hydrate inflating layer 5, and a space 10 is also provided for letting pass ignition spark produced from the tip end of the fuse. Thus a fire passage for ignition spark is formed. If water enters through a gap around the ignition head 3a of the fuse 3 or from an upper lid 8 side, or through pin holes in the wall of a heating room, or if moisture in the atmosphere is absorbed, the heat insulative layer 2 absorbs moisture or water. At this time, the hydrate inflating layer 5 inflates to close the space 10 which is to work as a fire passage, interrupt the contact between the spark from a fire source arriving at the tip end of the fuse 3 and the heat generating agent 1, whereby the ignition of the heat generating agent 1 can safely be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a container with a heating function that safely heats liquid food or drink sealed within the container using a self-combusting exothermic agent.

<Prior art and its problems> Containers with a heating function are well known, which are equipped with a heating section that generates heat through a chemical reaction of a heat generating agent in the container to heat liquid food while it is sealed inside the container. .

For example, Japanese Unexamined Patent Publication No. 63-152572 describes a container for storing a heated object, a metal exothermic agent storage part protruding toward the inside of the container, and a heat generating agent storage part that is stored in the exothermic agent storage part. There is a heat generating container having a heat insulating layer provided adjacent to a self-combusting heat generating agent, and a means for igniting the heat generating agent.

In this known example, the exothermic agent can be ignited by igniting a combustion wire (fuse) made of a bundle of fibers impregnated with a natural combustible agent using a torch or lighter flame, and by electrically igniting the exothermic agent using a heater. is listed.

<Problems to be solved by the invention> Generally, in a container with a heating function that uses a self-combusting exothermic agent,
The temperature inside the exothermic agent storage chamber is extremely high when the exothermic agent generates heat by combustion. Therefore, if the exothermic agent and the heat insulating material placed adjacent to it contain moisture due to moisture absorption or water infiltration, the moisture will decompose due to the high temperature during combustion, liberating hydrogen gas, and emitting it into the atmosphere. become. The amount of hydrogen gas generated increases in proportion to the amount of water contained.

Therefore, if excessive moisture is present in the vicinity of the exothermic agent due to moisture absorption or water intrusion from outside the heating container, hydrogen gas will be generated, sometimes ignited, and become secondary in the atmosphere when this exothermic container is used. It cannot be said that flames will not occur that may cause burns to the user or cause a fire.

<Means for Solving the Problems> The present invention provides a safe container with a heating function that has a structure that prevents the exothermic agent from being ignited even if excessive moisture enters the exothermic agent storage portion of the container with a heating function from the outside. That is.

As a result of repeated studies to solve the above-mentioned problems, the present inventors have discovered that the flame or spark generated by the ignition means and the igniter of the fuse or the ignition agent and exothermic agent provided at the tip of the fuse or the tip of this wire. By providing a layer of hydration expansion agent near the top space provided for ignition and combustion during the heating function, if moisture or water absorption occurs in the heating agent storage area of the container with a heating function, it will prevent the ignition of the heating agent. We have now developed a safe container with a heating function that can prevent any danger from occurring.

The present invention relates to a self-combustion exothermic agent, a container with a heating function having a heating chamber having a built-in fuse for igniting the exothermic agent, and an opening of the exothermic chamber of a exothermic agent layer disposed within the exothermic chamber. A heat-generating device in which a layer of hydration-swellable material is disposed on the side of the hydration-swelling material so that volumetric expansion of the layer of hydration-swelling material covers the igniter of the fuse or delays the closing of the flame guide at the tip of the fuse. It is a safe container with a heating function and has a structure that prevents the chemical from igniting.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to the drawings.

FIG. 1 shows a preferred embodiment of the present invention, and FIG.
The figure shows a longitudinal sectional view, and FIG. 1(B) shows a plan view. The liquid food/drink 9 is in the form of a cylindrical can, and the side wall 6 is made of a malleable metal such as aluminum, paper, or plastic. Bottom lid 11 with top lid 8 and exothermic agent storage chamber 20
A malleable metal is used. The bottom M11 and the side wall 6 may be made of different materials or may be made of the same material.

- As an example, the side wall 6, the top lid 8, and the bottom lid 11 including the exothermic agent storage part may all be made of aluminum, and the top lid 8 may have a pull-top structure that allows it to be easily opened by hand. This is the bottom seal for the heat generating agent storage chamber.

A layer of self-combustible exothermic agent 1 is stored in the innermost part of the exothermic agent storage chamber. Since the exothermic agent 1 has self-combustion properties, it can cause an exothermic reaction without substantially generating gas even in a sealed state as long as an ignition device is available, and is made of a mixture of an oxygen supply agent and a combustible agent. Oxygen-supplying agents include metal oxyacids, metal oxides such as potassium permanganate, trilead tetroxide, barium peroxide, bromate, copper oxide,
Perchlorates, etc. are listed. Examples of the combustible agent include powders of metals or metal alloys such as iron, silicon, silicon iron, aluminum, magnesium, zinc, and copper. A hydration expansion layer 5 made of a material that absorbs water and expands in volume is disposed on the end face of the heating agent layer on the opening side, and a heat insulating layer 2 is further disposed on the opening side. The material for the heat insulating layer is preferably one with excellent heat insulating properties, and an inorganic foam layer such as perlite, vermicular, orite, or an inorganic inert layer such as silica sand or alumina is used to prevent the combustion of the exothermic agent. It has the function of thermally confining. If the hydration expansion layer is made of a nonflammable inorganic material and has thermal insulation properties, the insulation N
5 can be replaced by a hydration expansion layer. M4 is provided on the end face of the heat insulating material layer on the end face of the hydration expansion layer 5 on the side of the opening of the exothermic agent storage chamber to prevent collapse of the core layer. This lid is made of metal, plastic, paper, etc., and has a hole that exposes a predetermined length of the fuse 3, and the tip of the fuse is long enough to be easily ignited by the flame of a match, lighter, etc. It is formed.

The fuse 3 passes through the center of the heat insulation N2, and its tip extends to a point in front of the end surface of the hydrated expansion material layer 5. A space 10 is provided at the position of the hydration expansion layer where the tip of the fuse faces, through which the ignition spark generated from the tip of the fuse passes, forming a spark path for the ignition spark. In this way, the exothermic agent 1 is ignited via the ignition head 3a of the fuse 3 exposed from M4 of the heat insulating layer. The fuse 3 is easily ignited by flame or spark, and a preferred example is a self-combustion type in which carbon fiber or metal fiber is impregnated with a mixture of metal or metal alloy powder and an oxygen supply agent. It can be used as a fuse. For example, good results can be obtained by impregnating and adhering a mixture of silicon iron powder and trilead tetroxide powder at a weight ratio of 3 to carbon fibers with nitrified cotton.

Magnesium or
A strong enough spark to ignite the exothermic agent can also be obtained by partially applying an ignition agent mixed with a portion of combustible powder such as aluminum.

Thus, in the case of a heating container having the ignition structure shown in FIG. 1, when the igniter 3a of the fuse 3 is directly ignited by the flame of a match, a lighter, etc., the fuse 3 propagates through combustion, and the heating agent side of the fuse is ignited. A spark is emitted at the terminal portion 3b of the heater, and the spark passes through the fire path in the space 10 to ignite the exothermic agent 1.

Since the heat generated from the exothermic agent 1 is insulated by the heat insulating layer 2, there is almost no heat conduction toward the lid 4 of the heat insulating layer, and the liquid food 9 is effectively heated.

If water enters from the gap between the ignition of the fuse or from the top lid side, or absorbs moisture from the atmosphere, or enters from a pinhole in the heating chamber wall and the insulation layer absorbs moisture,
Moisture or water absorption occurs in the hydration expansion layer, which expands the volume of the hydration expansion material layer, closing the space 10 that serves as a fire path, and the spark from the fire source reaching the tip bundle of the fuse 3 and the exothermic agent. contact with the heat generating agent is cut off, and ignition of the exothermic agent is prevented. The thickness of the hydration-swellable layer and the spacing 10 are determined by the swellability of the hydration-swellable material used. As one indicator, it is preferable to design based on the expandability of the hydration-expanding material so that when approximately 0.2 g or more of water is brought into the exothermic agent, the space 10 is filled by expansion.

For the hydration expansion layer 5, quicklime in powder form or formed into a certain shape, super absorbent polymers such as powder, cotton or sheet polyacrylamide, polyacrylate, organic flocculants, etc. are used. . These hydration swelling agents may be either inorganic or organic as long as they expand with water, but inorganic ones are preferred. This layer can simply be a layer of hydrated swellable material layered, or it can simply be pressure molded or overmolded to a shape using a breathable, non-combustible material. . Regarding the effective usage amount of the hydration expansion layer, the flame generated by the ignition means,
The layer must be in sufficient quantity to avoid direct contact between the spark and the fuse, ignition agent, and exothermic agent. In the case of quicklime, a single volume of 3 ml or more is used, and in the case of super absorbent polymers or organic flocculants, 0.2 g or more is used, but the predetermined amount varies depending on the structure of the heating container.

Regarding the quality of quicklime, it is preferable that it has high hydration expansion, relatively high purity, and apparent specific gravity of 1.0 or more, but good effects can also be obtained by appropriately mixing it with other heat insulating materials. be able to. In the case of a heating container having an ignition structure as shown in Fig. 1, it is preferable that it is molded into a fixed shape, but in the case of a heating container having an ignition structure as shown in Fig. 2 (described later), it may be of an irregular shape. do not have. but,
Organic zero hydration swelling layers are less preferred in the structure of the embodiment of FIG.

The embodiment shown in FIG. 2 is an example of a container with a heat generating function that ignites the igniter 3a of the fuse 3 with a lighter type igniter to ignite the exothermic agent 1.The embodiment shown in FIG. When the hydration expansion layer 5 absorbs excessive moisture or water from the outside of the heating container, a space is created between the fuse 3 and the igniter 3a exposed from the hydration expansion layer 5 due to the hydration expansion effect of the hydration expansion agent layer. It is configured to cover the ignition type 3a of the fuse,
It has a structure that prevents the exothermic agent from igniting. In this example, the fuse 3 is buried in the layer of the exothermic agent 1, penetrates the heat insulating layer 2 and further the hydration expansion agent layer 5, and is installed so that the remaining end 3b protrudes slightly near the upper end surface of the hydration expansion layer. has been done. The projecting remaining end 3a of the fuse is ignited by a spark generated by friction between the rotating file of the lighter-type spark generator 15 and the flint, and serves as the ignition member 3a of the fuse. Thus, the fuse 3 is ignited at 3a and self-combustion progresses along its longitudinal direction until reaching the vicinity of the end face of the layer of exothermic agent 1, where the exothermic agent is ignited and the liquid sealed in the can is heated by the self-combustion.

M4 is provided in an annular shape on the upper end surface of the hydration expansion layer 5, leaving the area around the projecting remaining end 3a of the squib.

This lid can be formed of a heat insulating material, and the area of the annular space is set so that when the hydration expansion material absorbs moisture, it expands to fill the igniter 3a of the fuse and easily forms a bulge 16. It is preferable to do so. It goes without saying that the igniter 3a of the fuse should be placed so that it can easily be hit by the spark of the lighter-type spark generator. The lighter-type spark generator 15 includes a hole in which a flint is inserted into a frame 14 and is elastically supported by a spring, and a rotor is pivotally supported so that it rotates in contact with the tip of the flint, and generates heat. It is fixed to the entrance of the chamber by suitable means such as fitting. The opening of the exothermic agent storage chamber is closed with a seal 12 on the surface of the bottom cover. As is clear from the embodiments described above, when moisture accidentally enters the exothermic agent storage chamber from the outside etc., the hydration expansion layer absorbs and expands the moisture to fill the igniter 3a of the fuse. It functions in such a way that it does not form and ignite. Although FIG. 2 has shown an example of ignition using a lighter-type ignition device, the fuse may be ignited using an ignition means such as a matchstick or the like.

<Example> Hereinafter, the present invention will be explained in more detail with reference to Examples.

Example 1 In a container having the structure shown in FIG. 1, the side wall 6, the bottom lid 11 equipped with a heat-generating storage section, and the top lid 8 were made of aluminum,
The outer diameter of the side wall was 65 mm and the length was 90 mm. The inner diameter of the exothermic agent storage chamber was 40 mm and the length was 50 mm. The container was filled with 180 cc of Japanese sake. As the exothermic agent, a self-combusting exothermic agent was used, which was a mixture of 10 g of potassium permanganate (200 mesh bath) and 15 g of iron powder (200 mesh bath). Layer 5 has 20 pieces of pressure-molded cylindrical material.
g A hole with a diameter of 6 mm is made in the center of the quicklime to create a fire road space 1.
0 was used. The fuse 3 is made by mixing a fine-diameter carbon fiber bundle with a nitrified cotton solvent solution and a mixture of silicon iron with an average particle size of 30μ and trilead tetroxide with an average particle size of 3μ in a weight ratio of 3nia. A diameter of 2 mm impregnated with water was used. In addition, the M4 insulation layer has a diameter of 4 mm in the center.
A ring-shaped tin plate with a hole was used, and a 3 mm long fuse was drawn out from the hole to serve as an igniter 3a. Inject 5 milliliters of water in the direction of the exothermic agent along the fuse through the gap between the fuse and the fuse, and after 15 minutes and 24 hours, ignite the igniter on the lid side of the heat insulating layer of the fuse with a pine flame. I tried.

As a result, in both cases, as a result of the hydration of the quicklime, the hydration expansion of the quicklime was closed in the fireway space IO, and no heat generation was generated due to combustion of the exothermic agent.

Example 2 In a container having the structure shown in FIG. 2, the side wall 6, the bottom lid 11 equipped with a heat generating storage part, and the upper M8 are made of aluminum,
The outer diameter of the side wall was 65 mm and the length was 901nI11. The inner diameter of the exothermic agent storage chamber was 40 mm and the length was 45 mm. The inside of the container was filled with 180 cc of Japanese sake. As exothermic agent 1, a self-combustion exothermic agent was used, which was a mixture of 10 g of potassium permanganate (200 mesh bath) and 15 g of iron powder (200 mesh bath). For the heat insulating layer 2, 100 mesh pass of silica sand was used, and for the hydration expansion layer 5, 10 ml of powdered quicklime of 14 to 250 mesh was formed on the heat insulating layer 2, and its upper surface was placed on the inner seal 13. The inner seal 13 has a diameter of 39 m.
I+1 circular aluminum foil, a vinyl chloride sheet of the same size, a polyethylene sheet of the same size, a breathable nonwoven fabric of the same size, a filter paper of the same size, etc., with a hole of 4 mm in diameter in the center were used. The fuse 3 is made by impregnating a micro-diameter carbon fiber bundle with a mixture of a mixture of silicon iron with an average particle size of 30 μm and trilead tetroxide with an average particle size of 3 μm in a weight ratio of 3 nia, and a nitrified cotton solution. A wire with a diameter of about 2 mm, with its tip 3
mm is protruded from the center hole of the inner seal 13 and the ignition member 3a is inserted.
was formed. M4 has a diameter of about 39mm and a diameter of 1 in the center.
Holes of 0mm, 15mm, and 20mm were drilled.
A tin plate with a thickness of 3 mm was used. Fuse and inner sticker 1
Inject 3 milliliters of water along the fuse toward the exothermic agent through the gap between the hole in the center of No. 3, and immediately after that,
A lighter-type spark generator was installed as shown in the figure. After 15 minutes, an attempt was made to ignite the igniter 3a using a lighter-type spark generator from the lid-side tip of the heat insulating layer of each fuse. At that time, the height of the bulge 16 of the hydrated expansion layer of quicklime (height from the top surface of the lid 4) was measured. The results are shown in Table 1. In each example, the igniter 3a was covered with a bulge and could not be ignited by the spark of the lighter, and the exothermic composition could not be ignited.

Embodiment 3 In a container having the structure shown in FIG. 2, 0.2 g of a fibrous sheet-like superabsorbent polymer was used as the inner seal 13 and the hydration expansion layer, and 3 The same evaluation as in Example 2 was conducted for cases in which ml and 5 ml of water were poured. All other conditions were the same as in Example 2. The results are shown in Table 2. Because of the swelling of the hydration expansion layer, no spark came into contact with the igniter of the fuse, and no combustion of the exothermic composition occurred.

Table 2 (Note) *mark indicates the amount of water injected.

Example 4 In a container having the structure shown in FIG. 2, the side wall 6, the bottom M11 equipped with a heat generating storage part, and the top M8 are made of aluminum,
The outer diameter of the side wall was 65 mm and the length was 90 mm. The inner diameter of the exothermic agent storage chamber was 40 mm and the length was 45 mm. The inside of the container with a heat generating function was filled with 180 cc of Japanese sake.

As the exothermic agent 1, a mixture of 200 mesh bath of potassium permanganate IOg and 200 mesh bath of iron powder 15 g is used, for the heat insulating layer 2, 100 mesh bath of silica sand is used, and for the hydration expansion layer 5, from 14 mesh 250
10ml of Metsuyu powdered quicklime is added to the insulation layer 2 and the inner seal 1
It was placed between 3.

For the inner seal 13, a circular aluminum foil with a diameter of 39 mm and an air-permeable nonwoven fabric of the same size were used, and a hole with a diameter of 5 mm was made in the center. The fuse 3 is made by impregnating a micro-diameter carbon fiber bundle with a mixture of silicon iron with an average particle size of 30 μm and trilead tetroxide with an average particle size of 3 μm in a weight ratio of 3 nia with nitrified cotton. A 3 mm long protrusion from the central hole of the inner seal 13 was used as an ignition device. As the lid 4 of the heat insulating layer, a tin plate with a thickness of 0.3 mm and with holes of 15 mm and 20 mm in diameter in the center, respectively, was used. A lighter-type spark generator as shown in FIG. 2 was attached thereon, and ignition was performed using the lighter-type spark generator after 14 days in an atmosphere of 100% relative humidity without the bottom seal 12. In addition, the height of the hydration expansion bulge 16 of the quicklime due to moisture absorption at that time was measured. The results are shown in Table 3. In both cases, the ignition head could not be ignited.

Practical conditions *, Normal temperature = 25°C1 Humidity: 100% or less.

*, Humidity control period = 14 days Third Table of Effects> The heating function container of the present invention has a self-combustion type heat generating agent built into the heat generating chamber and a heat insulating layer 2 that absorbs moisture from the air from outside and absorbs water. When the intrusion of the exothermic agent occurs, the ignition head or ignition path of the fuse can be covered and closed late due to the volumetric expansion of the hydration-swellable substance, which can prevent the exothermic agent from igniting, making it easier to use. It is a safe container with a heating function.

Therefore, the heating function container of the present invention can be said to be a safe heating function container suitable for heating liquid food and drink.

[Brief explanation of the drawing]

FIG. 1 shows one embodiment of the present invention, and FIG. 1(A) is a longitudinal cross-sectional view, and FIG. 1(B) is a plan view. FIG. 2 shows another embodiment of the present invention.
) is a longitudinal sectional view, and FIG. 2(B) is a plan view. 1. exothermic agent, 2. Heat insulation layer, 3. Fuse, 4. Insulating layer lid, 5. Hydrated swelling agent layer, 6. side wall, 7. Pulling metal fitting for opening, 8. Upper lid, 9. Liquid food and drink, 10. Humanitarian space, 11.
Bottom lid, 12. Bottom seal, 13, middle seal, 14. Lighter type spark generator fixed lid, 15. Lighter type spark generator, 20° exothermic acid chamber wall

Claims (1)

[Claims] A self-combustion exothermic agent, a container with a heating function having a heat generating chamber having a built-in fuse for igniting the exothermic agent, wherein water is placed on the opening side of the exothermic chamber of the exothermic layer disposed in the exothermic chamber. Non-ignition of exothermic agent in which a layer of hydration-swellable material is disposed so as to cover the ignition head of the fuse or to block the ignition path at the tip of the fuse due to the volumetric expansion of the layer of hydration-swellable material. Container with safe heating function