JP4570968B2 - Temperature control medium - Google Patents

Description

  The present invention is a liquid at room temperature, which can easily confirm the temperature history of whether or not the article was once exposed to an atmosphere of refrigeration temperature and then exposed to an atmosphere of higher temperature, and The present invention relates to a temperature control medium using an emulsified liquid that solidifies when cooled to a predetermined temperature.

  In recent years, as the number of packages delivered in a frozen or refrigerated state further increases, delivery means such as courier services for transporting these packages while maintaining a predetermined temperature to a delivery destination have become widespread. When delivering a package using such delivery means, for example, when loading a package from a refrigeration / refrigeration facility at the collection source to a delivery vehicle, or when reloading a package between delivery vehicles, take the package from the delivery vehicle and deliver it to the delivery destination. When carrying out such operations, luggage that must be kept frozen or refrigerated may be exposed to high-temperature or room-temperature atmospheres such as direct sunlight.

  In addition, it is required that the package be kept frozen or refrigerated even after it has been delivered to the delivery destination while being kept frozen or refrigerated. If the contents of the baggage are foods or pharmaceuticals, if they are not kept in a frozen or refrigerated state, they may be altered or a variety of germs may be propagated, which may impair the quality. In extreme cases, food poisoning and medical accidents can occur if food and pharmaceuticals are not kept frozen or refrigerated. What requires such strict temperature control includes, for example, various chemicals used in the chemical field and the photographic field in addition to foods and pharmaceuticals.

Conventionally, the following method has been proposed as a method for simply confirming whether or not the temperature management as described above is normally performed.
For example, Patent Document 1 discloses an emulsion (emulsion) in which one or more of C7-15 higher alcohols in which a fat-soluble dye is dissolved are dispersed in a nonionic surfactant and water. In addition, an indicator for storage temperature management is disclosed which is filled in a sealed container. Under normal temperature conditions, the storage temperature management indicator has an opaque milky color because the color tone of the dye of the emulsion is suppressed in appearance. On the other hand, when this storage temperature control indicator is exposed to a temperature below the temperature at which the emulsion is frozen, all the components of the emulsion are once solidified, but when the emulsion is melted again, coarsened emulsion particles float. Then, an oil droplet or an oil layer having a dark color tone floats to the upper layer, and is separated into an aqueous layer and an oil droplet or an oil layer. Therefore, it is possible to call attention at the time of use that the article in the package including the storage temperature management indicator in which such a change is recognized may be deteriorated.

  Patent Document 2 selects only an O / W type emulsion layer obtained by emulsifying an oily substance that is liquid at room temperature and melts when the storage management temperature is exceeded with a nonionic surfactant and water, and the above oily substance only. A storage temperature control indicator is disclosed in which an oil-soluble pigment that diffuses and transmits oil is provided on the surface opposite to the emulsion layer, and an opaque layer that diffuses and transmits oil-based substances in a sealed container. In this storage temperature control indicator, when the O / W emulsion layer is frozen at below freezing and then thawed, it is phase-separated into water and an oily substance, and only this oily substance diffuses and permeates the barrier. Then, the oil-soluble dye provided on the barrier is dissolved, and further, the opaque layer on the oil-soluble dye is diffused and transmitted to develop or color. Thereby, it can be easily detected with the naked eye that there is an abnormality in an article requiring strict temperature control.

The conventional method described above has the following problems.
For one thing, since nonionic surfactants known to be environmental hormones are used, when the above storage temperature control indicator is used on foods or pharmaceuticals, its safety is reduced. It is difficult to secure. For example, if the sealed container filled with the above-mentioned emulsion is broken unconsciously, the emulsion may adhere to the skin, food, medicine, and the like. When the emulsified liquid adheres to the skin, the nonionic surfactant may be absorbed into the body from the skin and may be harmful to health. In addition, when the emulsified liquid adheres to food or medicine, the food or medicine is accidentally swallowed, and as a result, the nonionic surfactant may be absorbed into the body and harm the health.

  Further, the conventional temperature management indicator has a problem that the period of storage at room temperature is as short as several days to about 6 months, and it cannot be stably stored at room temperature for a long time.

In addition, these temperature management indicators indicate that there has been an abnormality in temperature management after that, on condition that the temperature reaches a preset temperature (hereinafter referred to as “starting temperature”) at which the emulsion liquid coagulates. It is to be notified that the state of the emulsion has changed, but in order to determine whether the emulsion has reached the starting temperature or less, it must be judged by experience by pressing the emulsion with a finger and touching it. It was impossible for anyone to confirm easily without relying on experience. Therefore, the baggage stored and moved without reaching below the starting temperature will not change the state of the emulsified liquid even if there is an abnormality in the temperature control thereafter. If it was maintained and the state of the emulsified liquid had not changed, it was considered that it was stored and moved while maintaining an appropriate temperature.
JP 57-37227 A Japanese Patent Laid-Open No. 5-149797

  The present invention has been made in view of the above circumstances, is safe to eat, can be stably stored at room temperature for a long period of time, and can be operated at a predetermined temperature as well as temperature control is possible. It is an object of the present invention to provide a temperature management medium that can easily confirm whether or not a state is reached and can reliably perform management at an appropriate temperature.

  In order to solve the above-described problems, the present invention includes at least an emulsion liquid that is liquid at room temperature and solidifies when cooled to a predetermined temperature, and an inclusion material made of a sheet body in which the emulsion is sealed and the periphery is sealed. A temperature management medium comprising a region A in which a temperature indicating ink whose color tone reversibly changes at the predetermined temperature is provided on a part of at least one surface of the inner packaging material. I will provide a.

Here, the emulsion that is liquid at room temperature and coagulates when cooled to a predetermined temperature is, for example, a material that melts and phase-separates when heated, and consists of a lipid mixture containing water, fats and oils, and phospholipids. Say things.
The temperature indicating ink is an ink whose color tone reversibly changes at a predetermined temperature. For example, it is colorless at normal temperature, and when it reaches a predetermined temperature, it visually develops a color such as blue, or blue at normal temperature. It is colored and means a color that cannot be visually observed when it reaches a predetermined temperature. Furthermore, the color tone may change in two or more stages according to the temperature.

  According to such a configuration, the temperature management medium is liquid at room temperature and reversibly has a color tone at a predetermined temperature on a part of at least one surface of the embedding material filled with the emulsion that solidifies when cooled to the predetermined temperature. Since the region A is provided with the temperature-indicating ink that changes, the temperature control medium is attached to the outside of the article requiring temperature management or the box housing the article, and cooled to a predetermined temperature. When the temperature is cooled down, the region A where the temperature indicating ink is provided is colored or decolored, and it is visually informed that the temperature is below a predetermined temperature. Therefore, if the temperature at which the color tone of the temperature indicating ink changes and the temperature at which the coagulation of the emulsified liquid is set to be the same as the temperature required for storage, the color change of the temperature indicating ink can be visually confirmed. It can be easily determined that the liquid has reached the starting temperature and is operating, and is managed at an appropriate storage temperature.

  The reversible change in color tone makes it difficult to check the state of the emulsified liquid before use if the temperature indicating ink is colored at room temperature, so it is colorless at room temperature and confirms the state of the emulsified liquid before use. It is more desirable to be able to confirm that the emulsified liquid reaches the starting temperature by operating in a visible color such as blue when it reaches a predetermined temperature.

Further, since at least a part of the inner packaging material has transparency, the state of the emulsified liquid showing the temperature history stored in the inner packaging material can be easily visually confirmed from the outside.
In addition, the emulsion is solidified below a predetermined temperature, melted by raising the temperature again to a temperature exceeding the predetermined temperature, phase-separated, once once phase-separated, it will not return to the original emulsion again. By optically identifying the phase-separated state, it is possible to determine whether or not the baggage provided with the temperature control medium using the emulsified liquid has been exposed to a higher temperature than set. Moreover, even if the emulsion of a temperature control medium is stored for 1 year or more at room temperature, it can maintain a stable dispersion state (emulsion form) without phase separation. In addition, because it is composed of a lipid mixture containing water, fats and phospholipids that does not adversely affect the human body, the emulsified liquid adheres to the skin, food, and medicines unconsciously. Even if it enters the body, it does not harm health.

The lipid mixture is preferably composed mainly of lecithin and lysolecithin. According to such a configuration, since the emulsion contains the surfactant lecithin and lysolecithin, it can be stably stored at room temperature for 1 year or longer.
Moreover, it is preferable that the said fats and oils are edible fats and oils which have triacylglycerol as a main component and solidify around the said predetermined temperature. According to such a configuration, the emulsified liquid is solidified at a predetermined temperature or lower, melted by raising the temperature of the emulsified liquid again to a temperature exceeding the predetermined temperature, phase-separated, and once the phase-separated, once again the original emulsified liquid I will not return.

  In the temperature management medium having the above configuration, it is preferable that the region A is provided with a region B in which the emulsified liquid is visible through the inner packaging material without providing the temperature indicating ink. This area B can be a character or mark. According to such a configuration, when the temperature indicating ink is colored at room temperature, it is possible to visually confirm the state of the emulsion from region B, so the state of the emulsion before use can be confirmed, Further, when the temperature indicating ink is colorless and transparent at room temperature, even if the temperature indicating ink is colored and the area A is visualized, the emulsified liquid is not completely hidden by the area A and cannot be confirmed. Since it is possible to visually confirm this state, it can be determined without overlooking that there was an abnormality in temperature management from the state of the emulsion. Therefore, highly accurate temperature management can be performed.

The temperature management medium of the present invention is a liquid at room temperature and contains an emulsified liquid that exhibits a temperature history by solidifying when cooled to a predetermined temperature in the inner packaging material, and is placed on a part of at least one surface of the inner packaging material. The temperature management medium is provided with the region A in which the temperature indicating ink whose color tone changes reversibly at a predetermined temperature is provided so that the color tone of the region A in which the temperature indicating ink is provided changes. Anyone can easily confirm that the temperature has reached the predetermined temperature visually without relying on experience.
Therefore, the temperature management medium of the present invention can increase the certainty of starting the temperature management medium. Moreover, it can utilize by installing in the exterior of the box which stores the articles which require temperature management. Furthermore, the temperature management medium can be installed outside the box, so that the temperature history of the items in the box can be easily confirmed without opening the box, and the reliability of the items can be maintained without breaking the product form. Can do. Moreover, since at least a part of the inner packaging material has transparency, the state of the emulsified liquid showing the temperature history of the object to be measured can be easily confirmed even from the outside of the box.

In addition, the temperature management medium of the present invention is configured to include the region B in which the temperature of the emulsified liquid is visible through the inner packaging material without providing the temperature indicating ink in the region A where the temperature indicating ink is provided. When the emulsion is phase-separated due to abnormal temperature control, even if the temperature indicating ink develops and the area A is visualized by cooling down, the phase-separated emulsion can be completely hidden by the area A. By confirming the state of the emulsified liquid from the region B, it is possible to perform highly accurate temperature management without overlooking that there is an abnormality in temperature management.
Therefore, according to the temperature management medium of the present invention, it is possible to easily manage the temperature of a package delivered by a home delivery service or the like.

Hereinafter, a temperature management medium embodying the present invention will be described in detail.
FIG. 1 is a schematic cross-sectional view showing an embodiment of a temperature control medium according to the present invention, in which a temperature-indicating ink that is visualized at a predetermined temperature is provided on one surface of an inner packaging material containing an emulsified liquid. Represents a state equipped with.
In FIG. 1, reference numeral 1 denotes a temperature control medium, 2 denotes an inner packaging material, 3 denotes an emulsified liquid, 4 denotes a temperature ink, A denotes a region where the temperature ink is provided, and B denotes a region where no temperature ink is provided.

The temperature management medium 1 of this embodiment includes a region A in which the temperature indicating ink 4 that is visualized at a predetermined temperature is provided on one surface of the inner packaging material 2 containing the emulsified liquid 3, and in the region A, The temperature indicating ink 4 is not provided, and the emulsified liquid 2 is provided with a region B that is visible through the inner packaging material 2.
The inner packaging material 2 is configured by using, for example, a sheet body, and is configured in a bag shape by folding one sheet body or overlapping two sheet bodies and sealing the periphery thereof. Moreover, at least a part of the inner packaging material 2 has transparency, and the state of the emulsified liquid 3 filled therein can be visually observed from the outside.
The sheet body is preferably made of a synthetic resin such as nylon or polyethylene and can be heat-welded. Specifically, a GL film which is a transparent vapor deposition barrier film manufactured by Toppan Printing Co., Ltd. can be used. The sheet body may be formed by laminating a plurality of films. The sheet body in the present embodiment has a double structure in which a film made of polyethylene resin for heat welding is laminated on the inner surface of a film made of nylon resin.

The emulsified liquid 3 is liquid at normal temperature and solidifies when cooled to a predetermined temperature, and is configured by filling the inner packaging material 2 such as a bag.
In this embodiment, the temperature indicating ink 4 is colorless at normal temperature, and is visualized by developing a visible color at a predetermined temperature. The predetermined temperature at this time refers to the same temperature as the temperature at which coagulation of the emulsion 3 is started.

In addition, the inner packaging material 2 has an adhesive portion on the surface opposite to the surface provided with the region A provided with the temperature indicating ink 4 so that it can be attached to the outside of the box housing the object to be measured. It is desirable to have
The box refers to a transportable container such as cardboard or polystyrene foam. Therefore, in this embodiment, it has the structure which sticks and fixes to the exterior of a box via the adhesion part provided in the outer surface of the inner packaging material 2. In FIG. Thereby, the state of starting temperature and the state of the emulsion 3 can be easily confirmed from the outside, without opening a box. The temperature measurement object is accommodated inside the box having such a configuration, and is delivered or stored in a frozen or refrigerated state.

Next, the emulsion 3 will be described in detail.
Emulsion 3 is an emulsion composed of a lipid mixture containing water, fats and oils and phospholipids. In this emulsified liquid 3, either water or fats and oils form a dispersion medium (continuous phase) and the other forms a dispersed phase (discontinuous phase), and a lipid mixture containing phospholipid functions as a surfactant. One of water and fat is dispersed in the other in the form of fine particles. In addition, when the dispersion medium (continuous phase) is water and the dispersed phase (discontinuous phase) is oil or fat, the emulsified liquid 3 is an oil-in-water (Oil in Water type: O / W type) emulsion, When the dispersion medium (continuous phase) is fat and oil and the disperse phase (discontinuous phase) is water, a water-in-oil type (water in oil type: W / O type) emulsion is formed.

  In the emulsion 3, the ratio of water to fat (water: oil) is appropriately adjusted according to the target operating temperature of the temperature control medium 1 (temperature at which the emulsion 3 solidifies), but 5:95 ( wt: wt) to 95: 5 (wt: wt) is desirable, 10:90 (wt: wt) to 60:40 (wt: wt) is preferable, and 15:85 (wt: wt) to 30:70 (wt) : Wt) is particularly preferred.

  The water constituting the emulsified liquid 3 is not particularly limited, and any water can be used, but ion exchange water or distilled water is preferably used in consideration of the influence on lecithin and lysolecithin.

As fats and oils, the melting point is 0 ° C. or higher or 0 ° C. or lower, and the emulsion 3 is constituted with water using a surfactant near room temperature (about 23 ° C.). Examples thereof include those that are phase-separated from water by being heated to a temperature exceeding a predetermined temperature after being exposed to 0 ° C. to room temperature or lower. Examples of such fats and oils include edible fats and oils mainly composed of fats and oils such as triacylglycerol (TAG), diacylglycerol (DAG), and monoacylglycerol (MAG). In the emulsified liquid 3, one or more selected from these fats and oils are appropriately used depending on the target operating temperature of the temperature control medium 1 (temperature at which the emulsified liquid 3 is solidified). Further, either an oil or fat having a melting point of 0 ° C. or higher and an oil or fat having a melting point of 0 ° C. or lower are mixed at an appropriate ratio, or an oil or fat having a melting point of 0 ° C. or higher or an oil or fat having a melting point of 0 ° C. or lower is used. By appropriately using one of them, the operating temperature range of the temperature management medium 1 can be controlled to a desired temperature range.
In the present invention, the predetermined temperature refers to a temperature in the range of −60 ° C. or higher and + 20 ° C. or lower.

  Moreover, as a lipid mixture containing a phospholipid, what has a lecithin and a lysolecithin as a main component is mentioned.

  In the emulsion 3, the lecithin functions as a surfactant for dispersing either one of water and fat into the other in the form of fine particles. Examples of lecithin include soybean lecithin represented by the following general formula (1), egg yolk lecithin containing egg yolk phospholipid represented by the following general formulas (5) to (8), and fish-derived lecithin. .

In the above general formula (1), R ₁ and R ₂ are composed of saturated and unsaturated hydrocarbons. B represents a base.
For example, when B is a base represented by the following formula (2), soybean lecithin represented by the above general formula (1) is phosphatidylcholine, and B is a base represented by the following formula (3). The soy lecithin represented by the above general formula (1) is phosphatidylethanolamine, and when B is a base represented by the following formula (4), the soy lecithin represented by the above general formula (1) Is phosphatidylinositol, and when B is a hydrogen atom, soybean lecithin represented by the general formula (1) is phosphatidic acid.

  As shown in the above formula (1), soybean lecithin has two fatty acid groups and one base. Soy lecithin is a natural emulsifier that has various properties such as antioxidant, mold release, dispersion, foaming / defoaming, water retention, protein / starch binding, and chocolate viscosity reduction. Yes. In addition, soybean lecithin is obtained by filtering soybean crude oil from which soybean is extracted, adding about 2% warm water and stirring, and drying the product separated from the oil layer in the form of a gum. Furthermore, soybean lecithin is inexpensive and can be supplied in large quantities and can be obtained in various states depending on the degree of purification. Therefore, the type can be selected depending on the use conditions.

  In egg yolk lecithin, egg yolk of chicken egg is composed of 48% moisture, 16% protein, and 33% lipid, and the component contained in 30% of this lipid is phospholipid. Egg yolk lipid is composed of 65% neutral fat, 30% phospholipid, and 4% cholesterol. Egg yolk phospholipids are 70-80% of phosphatidylcholine of the above formula (5), 10-15% of phosphatidylethanolamine of the above formula (6), and sphingomyelin of the above formula (7) (7). (Sphingomyelin) 1 to 3%, and lysophosphatidylcholine (Lysophosphatidylcholine) 1 to 2% of the above formula (8).

  Like lecithin as described above, lysolecithin functions as a surfactant for dispersing either water or edible fats and oils in the emulsion 3 in the form of fine particles. As lysolecithin, the soybean lecithin represented by the above general formula (1), the lecithin represented by the above general formulas (5) to (8), and the like are lysed to obtain a structure in which one fatty acid is taken from lecithin. The eggplant is listed. Here, lysification refers to elimination of the fatty acid at the second position of the glycerin group possessed by lecithin using the enzyme Phospholipase A2.

  Lysolecithin is a natural emulsifier and has various properties such as antioxidation, mold release, dispersion, foaming / defoaming, water retention, protein / starch binding, and chocolate viscosity reduction. ing.

  In the emulsified liquid 3, the blending amount of the lipid mixture containing phospholipid is preferably 0.1 parts by mass or more and 40 parts by mass or less, and more preferably 1 part by mass or more and 20 parts by mass or less with respect to 100 parts by mass of the fats and oils. .

  When the blending amount of the lipid mixture containing phospholipid is less than 0.1 parts by mass with respect to 100 parts by mass of the fat and oil, it is difficult to emulsify. On the other hand, when the blending amount of the lipid mixture containing phospholipid exceeds 40 parts by mass with respect to 100 parts by mass of the oil and fat, the oil and fat and the phospholipid are difficult to disperse in water and are not emulsified well.

  The blending ratio of lecithin and lysolecithin is appropriately adjusted according to the target operating temperature of the temperature control medium 1 (temperature at which the emulsion 3 is solidified), but is 20:80 (wt: wt) to 80: 20 (wt: wt) is preferable, and 70:30 (wt: wt) to 30:70 (wt: wt) is more preferable.

  Moreover, in order to adjust the freezing point to a desired temperature range, you may mix | blend saccharides and water-soluble polymer with the emulsion 3. The freezing point of the emulsified liquid 3 can be adjusted to a desired temperature range by changing the type and blending amount of saccharides and water-soluble polymers.

  Examples of the saccharide include monosaccharides such as fructose, glucose, galactose, and mannose, disaccharides such as maltose, sucrose, lactose, and cellobiose, oligosaccharides such as stachyose and raffinose, pectin, galactan, starch, amylose, bululan, and arabian. Examples include polysaccharides such as gum, hyaluronic acid, sodium chondroitin sulfate, and carboxymethulquitin. Among these, monosaccharides and disaccharides whose molecular weight is known from the meaning of freezing point adjustment are desirable.

  Examples of the water-soluble polymer include sodium alginate, cellulose derivatives (eg, methyl cellulose, carboxymethyl cellulose, hydroxyethyl cellulose, hydroxypropyl cellulose, etc.), gelatin, polyacrylic acid samide, polyoxyethylene oxide, polyoxypropylene oxide, polyvinyl alcohol. , Carboxyvinyl polymer, polyvinylpyrrolidone, polyvinylpyrrolidone-vinyl acetate copolymer, vinyl acetate-crotonic acid copolymer, sodium polyacrylate, isobutene-maleic anhydride copolymer, vinyl methyl ether-maleic anhydride copolymer , Maleic anhydride, polyacrylamide, polyvinyl ether and the like. Since the water-soluble polymer tends to be highly viscous and difficult to emulsify as the degree of polymerization increases, it is preferable to use a water-soluble polymer having a weight average molecular weight of 100,000 or less.

  In addition, the inner packaging material 2 has a portion (space) for containing the emulsion 3 and is made of a material that can optically confirm the phase separation of the emulsion 3. And harmless material. Examples of ingredients that are harmless to eat include pullulan, wafer, gum, and candy. Examples of the form include a tubular shape, a plate shape, a film shape, and a spherical shape. If only phase separation is to be confirmed, the inner packaging material 2 may be made of a transparent material only in the vicinity of the boundary between the water phase and the oil phase obtained by phase separation of the emulsified liquid 3, and the other material may be made of an opaque material. .

  In addition, a gas such as air is enclosed in the inner packaging material 2 so that the volume of the liquid contained in the inner packaging material 2 is not affected by the phase separation of the emulsified liquid 3. You can keep it.

  The temperature management medium 1 of this embodiment uses phase separation of the emulsified liquid 3 in the inner packaging material 2. That is, in the temperature control medium 1, the emulsion 3 is a stable and uniform white liquid near room temperature (about 23 ° C.), and the emulsion 3 solidifies at a predetermined temperature or lower, for example, 0 ° C. to room temperature or lower. The emulsion 3 is phase-separated by raising the temperature again to a temperature exceeding the predetermined temperature (temperature exceeding the melting point of the oil, fat, lecithin and lysolecithin constituting the emulsion 3), and a transparent aqueous phase and an opaque oil phase Phase separation, and once the phase separation is carried out, it does not return to the original emulsion again (irreversible). By identifying the phase-separated state optically, for example, visually or with a sensor, it is possible to determine whether or not the package equipped with the temperature management medium 1 has been exposed to a higher temperature than set. Moreover, since the phase separation of the emulsified liquid 3 is irreversible, it is impossible to hide that the temperature management medium 1 has been exposed to an environment of a predetermined temperature or higher unless it is removed from the package. Therefore, according to the temperature management medium 1, the temperature management of a package delivered by a courier can be easily performed.

  Also, as a technology that utilizes the properties of the aqueous phase that becomes transparent after phase separation, when confirming the aqueous phase visually or with a sensor, an identification symbol or character is placed on the other side of the aqueous phase and the information on the ground is displayed. It is also possible to accurately and quantitatively confirm whether or not phase separation has occurred by reading or identifying the reflected light by providing a mirror surface.

In the temperature control medium 1 of this embodiment, the emulsion 3 contains the surfactants lecithin and lysolecithin, and the lecithin functions as a lipophilic surfactant, and the lysolecithin functions as a hydrophilic surfactant and is emulsified. When lysolecithin is formed, finer particles are formed, and the surfactants are arranged without gaps at the interface, so that it can be stably stored at room temperature for 1 year or more. That is, since the temperature control medium 1 can be stably maintained in a dispersed state (emulsion form) without phase separation of the emulsified liquid 3 even when stored at room temperature for one year or more, it is produced in large quantities in advance. An appropriate number can be used as necessary.
Moreover, even if it exposes the emulsion 3 to 35-40 degreeC atmosphere for 3 months, and performs a thermal acceleration test, a change is not seen. Moreover, even if the emulsion 3 is exposed to an atmosphere of about 23 ° C. for 6 months, it is stable without change.

  Moreover, since the emulsion 3 is composed of a lipid mixture containing water, fats and oils and phospholipids that does not adversely affect the human body, the emulsion 3 adheres to the skin, food, and medicine without being conscious of it, As a result, even if the emulsion enters the body, it does not harm health. Therefore, the temperature management medium 1 has extremely high safety because there is no possibility of an accident even if it is used by being attached to the outside of a box that contains food or medicine. Therefore, the present invention provides a temperature management medium that can be used in a wide range of fields including a field that has been difficult to use in the past, and that does not necessarily require packaging, so that the cost can be reduced.

  Moreover, the emulsion 3 can be made into the form of a high-viscosity thing by selecting suitably the combination of fats and oils and the lipid mixture containing a phospholipid. If it does in this way, the handling is easy, without the emulsion liquid 3 spilling darkly, and the freedom degree at the time of using the temperature management medium 1 will improve.

Next, an example of the manufacturing method of the emulsion 3 of this embodiment is demonstrated.
First, lysolecithin is dissolved in water to prepare an aqueous solution of lysolecithin.
Subsequently, lecithin is melt | dissolved in fats and oils, and fats and oils mixed liquid is adjusted. In addition, when using 2 or more types of fats and oils, after mixing these previously, a lecithin is melt | dissolved in this oil-fat mixture.
Next, the oil / fat mixture is gradually added to the aqueous solution of lysolecithin while stirring, and either water or oil / fat is dispersed in the form of fine particles in the other to obtain an emulsion 3.
And after filling the emulsified liquid 3 in the inner packaging material 2, the inner packaging material 2 was sealed, and the temperature indicating ink 4 visualized at a predetermined temperature was provided on a part of at least one surface of the inner packaging material 2. The temperature management medium 1 is obtained by providing the region A. At this time, a gas such as air may be enclosed in a portion of the encapsulating material 2 that is not filled with the emulsion 3.

Moreover, an example of the manufacturing method of the inner packaging material 2 is demonstrated based on FIG.
First, the sheet body 20 is pulled out from the sheet roll 21 (see FIG. 3A). Next, the sheet body 20 is folded and doubled so that the side edge portions 20a of the sheet body 20 are brought together (see FIG. 3B). Next, the side edge portions 20a of the overlapped sheet body 20 are heat-welded to form a side alignment portion 21A, and the sheet body 20 is referred to as a tubular body (hereinafter referred to as “tubular sheet body 20”). (See FIG. 3C). Thereafter, the lower end portion of the cylindrical sheet body 20 is thermally welded to form a bottom portion (not shown), and then the cylindrical sheet body 20 is filled with the emulsified liquid 3 and further divided at regular intervals. Then, the barrel portion of the cylindrical sheet body 20 is heat-welded in a direction orthogonal to the side mating portion 21A to form a segmented mating portion 21B (see FIG. 3D). And the cylindrical sheet | seat body 20 is cut | disconnected by the division part 21B, and it is set as the inner packaging material 2 (refer FIG.3 (e)).

  When the temperature management medium 1 is accommodated in the box 10 to which the temperature management medium 1 configured as described above is attached to the outside, first, the temperature management medium 1 has a room temperature (about 23 ° C. as shown in FIG. 4). ) It can be visually confirmed that the emulsified liquid 3 is a stable and uniform white liquid in the vicinity. Next, when this is cooled and the temperature control medium 1 reaches a starting temperature that is a preset temperature at which the emulsion liquid starts to solidify, only the region A in which the temperature indicating ink 4 is provided, as shown in FIG. It develops color and it can be visually confirmed that it is used at an appropriate temperature. When the temperature of the temperature controlled object rises during storage (transportation) and the temperature of the emulsified liquid 3 is again raised to a temperature exceeding the predetermined temperature (melting point of fat and oil in which lecithin and lysolecithin are dissolved), FIG. As shown, the colored ink 4 was decolored, the emulsion 3 was phase-separated and separated into a transparent aqueous phase 31 and an opaque oil phase 32, and the temperature control was abnormal. It can be confirmed visually. After that, when it is cooled again and reaches the starting temperature, as shown in FIG. 7, the region A provided with the temperature indicating ink 4 recolors. Since the temperature does not return, it can be visually confirmed from the region B where the temperature indicating ink 4 is not provided that the improper re-cooling has been performed after the abnormality in the temperature management.

In the above embodiment, the temperature indicating ink is colorless at room temperature, and when the temperature reaches a predetermined temperature, the color indicating the color such as blue is visible, but the temperature indicating ink of the present invention has a reversible color tone at the predetermined temperature. However, the present invention is not limited to this, and may be a color such as blue at room temperature, and may be discolored so as not to be visible when reaching a predetermined temperature.
Further, in the above embodiment, since the color is visibly visible at the starting temperature, for the purpose of easily confirming the state of the emulsified liquid at the starting temperature, the temperature increasing ink is not provided in the region A, and the inner packaging material The emulsion B is provided with a region B through which the emulsion can be visually observed through 2. However, it is colored such as blue at normal temperature, and when it reaches a predetermined temperature, it is discolored so that it cannot be visually observed. If it can be confirmed easily, the region B in which the temperature indicating ink is not provided in the region A may not be provided. Of course, it is colorless at room temperature, and even if it reaches a predetermined temperature and develops a visible color such as blue, it is not necessarily a region as long as the state of the emulsion can be confirmed by some means at the starting temperature. It is not necessary to provide a region B in which temperature indicating ink is not provided in A.

  EXAMPLES Hereinafter, although an Example demonstrates this invention further more concretely, this invention is not limited to a following example.

Example 1
First, in a bag-like soft packaging material made of a two-layer sheet laminated with a transparent film of polyethylene and nylon, a 4 ° C. start-up type emulsified liquid whose temperature at which coagulation is started is set to 4 ° C. is filled. By sealing the periphery using a sealer, an inner packaging material having a thickness of 20 mm × 20 mm and a thickness of 2 mm was produced. Next, a temperature control medium is applied by applying temperature-indicating ink which is colorless at normal temperature and visibly develops color at 4 ° C. on one side of the inner packaging material so as not to disturb the confirmation of the emulsified liquid filled therein. A was produced.
And this temperature control medium A was put in the refrigerator set to 4 degreeC, and it confirmed that it reached | attained the starting temperature which is the preset temperature from which coagulation | solidification of an emulsion liquid is started. The results are shown in Table 1. In addition, when this temperature control medium A is left in the refrigerator as it is for one day, it is taken out and checked for abnormality in temperature control when it is returned to room temperature of 22 ° C., and when it is again put in the refrigerator and cooled to 4 ° C. Each illegal recooling check was performed. The results are also shown in Table 1.

(Comparative Example 1)
Further, as Comparative Example 1, the same 4 ° C. start-up type emulsion as in Example 1 was filled into a bag-like soft packaging material composed of a two-layer sheet laminated with a transparent film of polyethylene and nylon, and its surroundings. Was sealed using an impulse sealer to prepare a temperature control medium B of 20 mm × 20 mm and a thickness of 2 mm.
And like Example 1, this temperature management medium B was put in the refrigerator set to 4 degreeC, and it was confirmed that it reached | attained the preset starting temperature. The results are shown in Table 1.

(Comparative Example 2)
In addition, as Comparative Example 2, the same 4 ° C. start-up type emulsion as in Example 1 was filled into a hard container made of a two-layer sheet obtained by laminating a transparent film of vinyl chloride and polyethylene, and the mouth portion was filled By sealing, a temperature management medium C of 20 mm × 20 mm × 2 mm was produced.
And like Example 1, this temperature control medium C was put in the refrigerator set to 4 degreeC, and it was confirmed that it reached the preset starting temperature. The results are shown in Table 1.

(Comparative Example 3)
Moreover, as Comparative Example 3, by sealing the periphery using an impulse sealer without putting anything in the bag-like soft packaging material composed of a two-layer sheet laminated with a transparent film of polyethylene and nylon, A temperature management medium D having a thickness of 20 mm × 20 mm and a thickness of 2 mm was produced.
And like Example 1, this temperature control medium D was put in the refrigerator set to 4 degreeC, and it confirmed that it reached | attained to the preset starting temperature. The results are shown in Table 1. In addition, when this temperature control medium D is left in the refrigerator as it is for one day, it is taken out and checked for abnormalities in temperature control when it is returned to room temperature of 22 ° C., and when it is again put in the refrigerator and cooled to 4 ° C. Each illegal recooling check was performed. The results are also shown in Table 1.

  From the results shown in Table 1, in the temperature management medium A of the present invention of Example 1, the temperature indicating ink is colored because the temperature indicating ink region is provided on the flexible inner packaging material filled with the emulsion. As a result, it was confirmed that the starting temperature was reached visually. In addition, when the temperature control medium A was returned to room temperature, the temperature indicating ink that was visibly colored was decolored, and it was confirmed that there was an abnormality in temperature control due to the phase separation of the emulsion. Furthermore, when the temperature control medium A is cooled to the starting temperature, it can be confirmed that the temperature indicating ink has reached the starting temperature by coloring again, but the emulsion does not return to its original state with phase separation. It was possible to confirm illegal re-cooling after abnormal temperature management.

  On the other hand, in the temperature control medium B of Comparative Example 1, the temperature indicating ink area is not provided so as to overlap the flexible inner packaging material filled with the emulsified liquid, so it can be confirmed that the starting temperature has been reached by visual observation. There wasn't. For this reason, it was determined whether the starting temperature was reached by pushing the inner packaging material by hand and the hardness of the emulsified liquid was felt, and it was considered that the starting temperature was reached because it felt somewhat harder than normal temperature, but the accuracy was very poor. It was a thing. Therefore, it can be seen that by providing the temperature indicating ink region, it can be easily confirmed with high accuracy whether or not the temperature control medium has reached the starting temperature.

  Further, in the temperature control medium C of Comparative Example 2, the temperature indicating ink region was not provided so as to overlap the hard container filled with the emulsified liquid, and thus it was not possible to confirm that the starting temperature had been reached visually. . For this reason, the hard container was pushed by hand and an attempt was made to determine whether or not the starting temperature was reached by the hardness of the emulsion, but the hard container was hard and the hardness of the emulsion could not be confirmed. Therefore, by providing the temperature indicating ink area, it can be seen that the temperature control medium has reached the starting temperature with high accuracy and can be easily visually confirmed, and the emulsified liquid is more tactile when filled in a flexible packaging material. You can also see that.

  Further, in the temperature control medium D of Comparative Example 3, although the temperature indicating ink region is provided on the flexible inner packaging material, the temperature indicating ink is colored because the embedding liquid is not filled in the inner packaging material. It was possible to confirm that the start-up temperature was reached by visual inspection, but it was not possible to confirm that there was an abnormality in the temperature management or an unauthorized re-cooling after there was an abnormality in the temperature management. . Therefore, there was an abnormality in the temperature control due to the change in the state of the emulsified liquid, not only by providing the temperature indicating ink area, but also by providing the temperature ink area over the flexible packaging material filled with the emulsified liquid. It can also be seen that unauthorized re-cooling after abnormality in temperature management can be confirmed.

  Thereby, the temperature management medium A in Example 1 of this invention can show a highly accurate temperature history, and it turns out that it is effective for the temperature management of the package accompanying the preservation | save and movement which kept the frozen / refrigerated state. . In addition, it can be easily understood that the temperature management medium A of Example 1 is being used at an appropriate temperature, so that it can be surely performed more effectively.

  The temperature management medium of the present invention can be used for new forms that are used with foods and medicines in addition to the conventional use forms that are attached to the surface of luggage, so the status of temperature management of foods and medicines can be grasped. Can also be used to do.

It is a schematic sectional drawing which shows one Embodiment of the temperature management medium which concerns on this invention. 1 is a schematic plan view showing an embodiment of a temperature management medium according to the present invention. It is the schematic explaining sequentially the manufacturing method of the inner packaging material in the temperature control medium based on this invention. It is the schematic which shows the state before a temperature management medium reaches starting temperature in the box which attached the temperature management medium which concerns on this invention. It is the schematic which shows a state when a temperature management medium reaches starting temperature in the box which attached the temperature management medium which concerns on this invention. It is the schematic which shows the state after an emulsion changes in the box which attached the temperature control medium which concerns on this invention. It is the schematic which shows a state when starting temperature is reached again, after an emulsion changes in the box which attached the temperature control medium which concerns on this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Temperature control medium, 2 ... Inner packaging material, 3 ... Emulsified liquid, 4 ... Thermal ink, 10 ... Box body, 20 ... Sheet body, 31 ... Water phase, 32 ... Oil phase.

Claims (2)

An emulsion that is liquid at room temperature and solidifies when cooled to a predetermined temperature;
An enveloping material comprising a sheet body in which the emulsified liquid is sealed and the periphery is sealed;
A temperature management medium comprising at least
A temperature management medium comprising a region A in which temperature indicating ink whose color tone reversibly changes at the predetermined temperature is provided on a part of at least one surface of the inner packaging material. 2. The temperature management medium according to claim 1, wherein the region A is provided with a region B in which the emulsified liquid is visible through the inner packaging material without providing the temperature indicating ink.

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