JPH07194641A - Disposable portable body warmer and its production method - Google Patents

Abstract

PURPOSE:To provide a disposable portable body warmer without using a porous film, no degradation in thermal properties and productivity occurs even if a conventional nonwoven fabric and sealant type bag is used, which warmer a heat generating composition without deviation of the content in use is sealed into, and its production method. CONSTITUTION:A body warmer is constituted by sealing a heat generating agent containing iron powder, activated carbon, salts, water, etc., and adding water absorption resin 1.0-10% to the total quantity and an excipient 1.0-15% to the total quantity into a bag. On it and its production, among following materials constituting the heat generating composition, (A) iron powder, (B) an excipient, (C) activated carbon, salts, water absorption resin, water, etc., and other composition, (A), (B) and (C) are almost simultaneously mixed and instantly filled in a bag, or immediately after adding (C) to a mixture of (A) and (B), or adding (B) to a mixture of (A) and (C), they are filled in a bag.

Description

Detailed Description of the Invention

[0001]

The present invention relates to iron powder, activated carbon, salts,
The present invention relates to a body warmer, which comprises a heat-generating composition containing water and the like and a water-absorbent resin and an excipient mixed in a storage bag, and a method for producing the body warmer.

[0002]

2. Description of the Related Art An exothermic composition composed of iron powder, activated carbon, salts, water, etc., generates heat simply by contacting with air without requiring ignition. Enclosed and used Cairos are widely used. Conventionally,
In order to retain the water necessary for the oxidation reaction of iron powder, wood powder, silica gel, perlite, vermiculite was used as a water retention agent, but these inorganic or carbon water retention agents have a small water retention capacity, There is a drawback in that the evaporation of water rapidly progresses along with the heat generation and the heat generation duration of the body warmer is shortened after use. To improve this point, recently,
It is common to use a water-absorbent resin which is excellent in water retention and is not sticky as a whole and is advantageous in production.

On the other hand, in order for the used body warmer to exhibit appropriate heat generation performance such as heat generation temperature and heat generation time,
In addition to the composition, composition, and filling amount of the exothermic composition snout, the material of the storage bag is also an important factor. At present, many used Cairos have adopted a method in which a bag material obtained by laminating polyethylene etc. as a sealant on a non-woven fabric is provided with air permeability by punching a needle hole. When used for a long time, the contents often shift to one side during use and the user feels uncomfortable to wear on the body. On the other hand, with the porous film that was recently introduced as a material for a new storage bag, when the oxygen in the bag is consumed due to an exothermic reaction, the pressure inside the bag will be reduced and the contents will not be biased while using the body warmer. Although it has characteristics, it has the problems that the cost is higher than that of the above-mentioned nonwoven fabric sealant, and that it is extremely difficult to control the air permeability by the fine pores.

[0004]

The present invention, even when applied to a conventional non-woven fabric sealant type material without using a porous film, has not only temperature performance and manufacturability but also deviation of contents during use. The purpose of the present invention is to develop a use-in-use body warmer in which a heat-generating composition that does not generate heat is enclosed, and an efficient production method thereof.

[0005]

In order to solve the above problems, the present invention contains iron powder, activated carbon, salts, water and the like, and contains water absorbent resin in an amount of 1.0 to 10 with respect to the total amount.
%, And an exothermic composition containing an excipient in an amount of 1.0 to 15% with respect to the total amount enclosed in a storage bag, and the following exothermic compositions constituting the exothermic composition in the production thereof. Raw material (A) Iron powder (B) Excipient (C) Activated carbon, salts, water-absorbent resin, water, etc. Of the other raw materials for the composition, almost all of the raw materials (A), (B) and (C) are used. After mixing at the same time, immediately fill the storage bag, or (A)
According to the method for producing a single-use warmer, in which (C) is added to the mixture of (B) and (B) or (B) is added to the mixture of (A) and (C), and then the bag is immediately filled. .

The iron powder constituting the exothermic composition of the present invention is a main component involved in the exothermic reaction of oxidation, and includes reduced iron, cast iron and the like, and powdery ones are generally used, but granular, fibrous, etc. You may mix the thing. Activated carbon and salts are necessary as an oxidation reaction accelerator for iron powder, and examples of the salts include sodium chloride, potassium chloride, magnesium chloride and the like.

As the water-absorbent resin, those having a high water-retaining ability and capable of keeping the whole in a free-flowing state are preferable in production. For example, isobutylene-maleic anhydride copolymer, polyvinyl alcohol-acrylate copolymer, starch-acrylate graft copolymer, polyacrylate cross-linked product, acrylate-acrylate copolymer, acrylic Examples thereof include acid salt-acrylamide copolymers and hydrolyzed products of crosslinked polyacrylonitrile, but are not limited thereto. Of course, wood powder as a water retention agent,
A base material such as silica gel, perlite or vermiculite may be used in combination. It should be noted that the content of the water-absorbent resin may exceed 10% in the conventional composition with respect to the total amount of the exothermic composition. Is specified in the range of 1.0 to 10%.

The present invention is characterized in that an excipient is added as a component constituting the exothermic composition. Excipients are used to prevent the use of hand warmers during storage and after use, and to prevent the materials from shifting in the storage bag during the use of hand warmers to prevent unevenness, making the hand warmer thin and It is possible to give flexibility, and it is possible to improve the wearability on the body, clothes, and the like. This effect can also be obtained by using a storage bag made of a porous film material, but this porous film has the drawbacks of high cost and difficulty in controlling the air permeability and stable temperature performance. Therefore, the practical advantage of the present invention is extremely large. As the excipient, starch-based excipients such as pregelatinized starch and dextrin, polysaccharide-based excipients such as sodium alginate and sodium caseinate, cellulose derivative-based excipients such as carboxymethyl cellulose, ethyl cellulose and hydroxypropyl cellulose , Polyvinyl alcohol type, water dispersion emulsion type, etc.
Other materials can be used as long as they meet the purpose of the present invention.

[0009] The excipient is 1.
0 to 15%, preferably 3.0 to 10% is blended.
If it is less than 1.0%, the effect of preventing uneven bias cannot be obtained, and if it exceeds 15%, the temperature performance is affected, which is not preferable.

In the exothermic composition of the present invention, in addition to the above-mentioned components, a weak acid salt of an alkali metal, a weak acid salt of an alkaline earth metal, a hydrogen generation inhibitor such as metasilicate, an extender, zirconium, ceramics, etc. The substance or the like may be added as appropriate.

The present invention also provides an efficient method for producing a body warmer in which such a useful exothermic composition is enclosed in a storage bag. That is, (A) iron powder, (B) excipient, (C) activated carbon, salts, water-absorbent resin, water, etc. of the other raw materials constituting the exothermic composition, among (A), ( After mixing the raw materials of B) and (C) almost at the same time, immediately fill the storage bag, or (A)
It can be manufactured by adding (C) to the mixture of (B) and (B) or by adding (B) to the mixture of (A) and (C) and immediately filling the bag. For example, when (B) comes into contact with the water in (C), a nodule is formed and it is difficult to fill the storage bag, so the three components (A), (B), and (C), or (B) and (C). It is not possible to previously mix the two components of 1) with a mixer. That is, (A),
The three components (B) and (C), or the mixture of (A) and (B) and (C), or the mixture of (A) and (C) and (B) must be efficiently mixed immediately before filling. There is. As means suitable for this purpose, for example, one bag filling amount of (A),
There is a method in which the respective raw materials (B) and (C) are put into one container and then filled in the storage bag while being mixed through an obstacle, but of course, other means can be appropriately adopted.

As the storage bag for enclosing the heat-generating composition of the present invention, a bag material obtained by laminating non-woven fabric or paper with a film of polyethylene, polypropylene or the like as a sealant,
A storage bag with a needle hole and breathability is suitable. Since this product is cheaper than the porous film and has relatively uniform air permeability, it can be used as a body warmer with stable temperature performance. Further, in the case of the conventional exothermic composition, it is necessary to make the needle hole small so that the composition does not leak out, but in this exothermic composition, the contents may leak out due to the effect of the excipient. Since there is no needle hole, the size of the needle hole can be set relatively arbitrarily. It is possible to apply the present heat-generating composition to a storage bag made of a porous film, that is, polyethylene, polypropylene, polyurethanes having fine continuous pores on the surface and inside or plastics obtained by flexibly modifying them. No, but the benefits are small.

The use-use warmer thus obtained is usually further stored in a non-breathable bag and crushed at the time of use, but the use-use warmer of the present invention has excellent temperature performance. , You can get a nice warmth without any bias of the contents in use. Needless to say, auxiliary means for attaching the body warmer to the body or clothing, such as an adhesive tape, may be appropriately loaded.

Next, examples and test examples are shown in order to explain the present invention in more detail, but the present invention is not limited to these.

[0015]

Example 1 Iron powder 20 g, activated carbon 2.5 g, sodium chloride 1.5 g, wood flour 3.5 g, sodium metasilicate 1.0 g, water-absorbent resin (isobutylene-maleic anhydride copolymer system) 1.0 g, A mixture consisting of 10.5 g of water and 10.5 g of water was put into one container, and 3 g of pregelatinized starch was added thereto. While mixing both components through an obstacle such as a screw, the nonwoven fabric-polyethylene material was filled into a storage bag and filled into a bag to obtain a body warmer according to the present invention. This hand warmer has excellent temperature performance, and due to the action of pregelatinized starch as an excipient, it maintained a thin flat plate shape during use and fits comfortably to the body. When all the raw materials of the exothermic composition were put into a Nauta mixer and an attempt was made to mix them, it was impossible to fill them due to agglomeration.

[0016]

[Test Example] In accordance with Example 1, various exothermic compositions were prepared according to the formulations shown in Table 1, and filled in a storage bag in which a nonwoven fabric-polyethylene material was perforated. The productivity of the exothermic composition due to stickiness, etc., temperature performance (maximum temperature, duration of heat generation, etc.), and usability (deviation of contents during use, etc.) are shown in Table 1. The evaluation was based on the following criteria. (1) Manufacturability: ○ (manufacturability is good in the free-flowing state) × (manufacturing is extremely sticky and difficult) △ (between ○ and ×) (2) Temperature performance: ○ (maximum temperature is 55 to 65 ° C, and Exothermic heat of 40 ° C or more lasts for 10 hours or more) × (maximum temperature is 50 ° C or less, or heat generation duration of 40 ° C or more is 8 hours or less) △ (between ○ and ×) (3) Usability: ○ (use There is no unevenness of the snout inside, and it fits the body) × (Contents are offset to one side, causing discomfort in wearing) △ (between ○ and ×)

[0017]

[Table 1]

As a result of the test, the water absorbent resin was 1.0 to 10% of the total amount, and the excipient was 1.0 to 1% of the total amount.
The useable body warmer encapsulating the exothermic composition of the present invention containing 5% was excellent in manufacturability, temperature performance and usability. On the other hand, when the amount of the excipient was 1% or less (Comparative Example 1), the usability was not improved. On the other hand, when it was more than 15% (Comparative Example 2), the productivity and the temperature performance were decreased. Further, there is a mutual relationship between the water-absorbent resin compounding amount and the excipient compounding amount. For example, as in Comparative Example 3 and Comparative Example 4, the combined use outside the specific range failed in performance. .

[0019]

Example 2 First, 3.0 g of activated carbon, 1.5 g of sodium chloride, 4.0 g of vermiculite, 1.0 g of sodium hydrosulfite, water absorbent resin (2.5 g of starch-acrylate graft copolymer, and water). A mixture consisting of 13 g was prepared: 25 g of this mixture, 30 iron powders
g and carboxymethyl cellulose (2.0 g) were put into one container almost at the same time, and a spunbond (non-woven fabric made from Asahi Kasei-polyethylene sealant material) storage bag was immediately filled from this container through a mixing process.
The bag was further stored in a non-breathable plastic film bag and stored at room temperature for 1 year. Then, the plastic film was crushed, the storage bag was taken out, and the bag was put into use. As a result, the temperature performance and usability were satisfactory, and no bias of the contents in use was observed.

[0020]

According to the present invention, even if a conventional non-woven fabric-sealant type storage bag is used without using a porous film, not only temperature performance and manufacturability but also deviation of contents in use can be obtained. It can be used as a body warmer containing a heat-generating composition that does not occur, and also provides an efficient method for producing the body warmer, which is extremely useful.

Claims (2)

[Claims] 1. Iron powder, activated carbon, salts, water, etc. are contained, and the water absorbent resin is 1.0 to 10% of the total amount, and the excipient is 1.0 to 15 of the total amount. % Useable body warmer, characterized in that it contains a heat-generating composition mixed in a storage bag. 2. Iron powder, activated carbon, salts, water, etc. are contained, and the water-absorbent resin is 1.0 to 10% of the total amount, and the excipient is 1.0 to 15 of the total amount. % Of the following raw materials constituting the exothermic composition in the use of a heating bag in which the exothermic composition containing 10% is enclosed in a storage bag: (A) iron powder (B) excipient (C) activated carbon, salts, Of the other raw materials for the composition such as water absorbent resin, water, etc., the raw materials (A), (B), and (C) are mixed almost at the same time and then immediately filled in a storage bag, or (A)
A mixture of (C) is added to the snout of (B) and (B), or (B) is added and mixed to the mixture of (A) and (C), and then the bag is immediately filled. Cairo manufacturing method.