JPH11276137A - Storage of food, storing apparatus and sheet material used therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a storing method by which storage at a controlled freezing point is carried out by using an on-off type cooling device and moisture suitable for the storage is kept, without fear of dew formation or the like, and further to provide a storing apparatus and a sheet material usable therefor. SOLUTION: This method for storing food in a storing vessel 1 in which a properly cooled wind flows, comprises installing a storing part 4 with an atmosphere capable of intercepting the flowing-in of the cooled wind but allowing a moisture component to come and go, and storing the food in the storing part 4. A low air-permeable or air-impermeable sheet 2 having moisture permeability is preferably used as a means for forming the storing part 4. The storing apparatus has the storing vessel 1 having the storing part 4 for storing food, a cooling device 5 for blowing the cooled wind into the storing vessel 1, and the sheet material 2 for parting the storing part 4 with the atmosphere capable of intercepting the flowing-in of the cooled wind but allowing the moisture component to come and go.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a storage method for storing foods such as agricultural products such as fruits and vegetables, marine products such as crabs, and processed foods such as noodles and sweet potatoes. A storage method that allows easy storage,
And a storage device used for carrying out the storage method, and a sheet material used for the storage device.

[0002]

2. Description of the Related Art It has been known that according to so-called ice temperature storage, in which agricultural products such as fruits and vegetables are cooled at a temperature just before freezing, the agricultural products can be stored fresh for more than one year. In addition, according to ice temperature storage, not only can you maintain freshness,
It is also known that the deterioration and growth of microorganisms during storage can be suppressed, and that the umami component and the sweet component become deeper.
From such an excellent point, development of an apparatus for ice temperature storage and a specific storage method has been promoted.

[0003] Here, as a cooling storage, a storage system having a double-wall structure such as a general refrigerator and a brine system for cooling a storage room by circulating a refrigerant through a wall gap is used, and a cool air is used. Some use a ventilation system that cools the air while blowing it into the refrigerator.

In the brine method, since the cooling atmosphere is formed without using the cool air, there is an advantage that the evaporation of the water from the storage object (food) is small, and the inside of the storage can be cooled uniformly and almost uniformly. . On the other hand, ice temperature storage of hydrated foods such as crops and marine products generally requires high humidity of 80% RH or more. However, such high humidity has a problem that dew condensation easily occurs on the inner wall surface of the storage. is there. Condensation in the storage room causes mold, germs and the like to occur, so that the storage room needs to be cleaned frequently.

In the case of the ventilation system, the problem of dew condensation hardly occurs because the storage room is appropriately ventilated. However, since cold air directly hits the storage object (food), the water in the storage object evaporates and becomes easy to dry. Therefore, in the case of long-term storage, it is necessary to humidify the inside of the storage. Further, the method of directly blowing cold air to cool the inside of the refrigerator has a problem in that the temperature inside the refrigerator varies depending on the flow of the cool air, and thus it is difficult to be constant.

[0006] Further, the cooling device used for the ventilation system includes an on-off method in which the power supply to the motor of the cooling device is turned on and off to adjust the blowing time of the cool air to set the storage temperature as an average, and a cooling device for the cooling device. There is a so-called inverter control system in which the frequency of a voltage applied to the motor is changed to change the number of revolutions of the motor to control the amount of air flow to maintain a constant temperature.

Here, ice temperature storage means that a narrow temperature range from 0 ° C. to the freezing point (the temperature at which food begins to freeze) must be maintained so that cells do not freeze and die while maintaining freshness. Specifically, it is necessary to suppress the difference between the maximum or minimum temperature in the refrigerator and the set temperature to about ± 0.5 ° C. In the inverter system, such a delicate temperature setting is possible, but the cooling system of the inverter system is very expensive and is not suitable as a storage for agricultural products provided by general individuals (mainly farmers). On the other hand, in the inexpensive on / off method, since the difference between the upper limit set temperature at which the power is turned on and the lower limit set temperature at which the power is turned off is about 5 ° C., it is difficult to achieve ice temperature storage that needs to maintain a narrow temperature band. .

In view of such circumstances, Japanese Patent Application Laid-Open No. 10-2
No. 8465 discloses a temperature stabilization method that uses a conventional inexpensive on-off type cooling device and does not directly apply cold air to the storage object, and further reduces the difference between the highest temperature and the lowest temperature. A storehouse has been proposed. This storage is
A partition plate composed of heat insulating panels, etc., divides the inside of the storage room into a cooling room cooled by a cooling device and a storage room for storing articles to be stored, and receives temperature information from a temperature sensor disposed in the storage room. At the same time, the flow rate of cold air from the cooling chamber is adjusted.

[0009]

The temperature-stabilized storage disclosed in the above publication prevents cold air from flowing into the storage room, so that the influence of the on-off type cooling device is reduced, and the maximum temperature is reduced. The difference from the minimum temperature can be reduced. However, since the control of the cooling temperature in the storage room is performed by controlling the amount of cool air flowing in from the inlet formed in the partition plate, the problem that the temperature in the storage room varies depending on the place is completely solved. The solution has not been reached. Therefore, strict requirements for temperature changes, such as ice temperature storage, are not yet satisfactory.

In addition, since the saturated steam pressure is low at low temperatures such as ice temperature storage, it is necessary to provide a humidifier in the storage chamber in order to maintain high humidity conditions suitable for storage. However, since the inside of the storage chamber is substantially closed except for the inflow port, a problem of dew condensation on the partition plate occurs when the humidification amount from the humidifier is excessive. To maintain a high humidity atmosphere without dew condensation, it is necessary to precisely control the humidity.

Further, it is difficult to assemble and install the partition plate in the storage, and to clean the partition plate for removing dirt and mold due to dew condensation or the like, a person must enter the storage and wipe it. It was troublesome.

The present invention has been made in view of such a technical background, and an object of the present invention is to store ice temperature by a ventilation system using an on-off type cooling device, and to perform dew condensation or the like. An object of the present invention is to provide a storage method, a storage device, and a sheet material used for the storage method and the storage device, which can secure moisture suitable for storage without worry.

[0013]

According to the present invention, there is provided a method of storing food in a method of storing food in a storage room into which cold air flows, wherein the flow of the cold air is blocked, but the inflow and outflow of moisture are allowed. An atmosphere storage section is formed, and food is stored in the storage section. It is preferable to use a sheet material having low air permeability or non-air permeability and moisture permeability as a means for forming the storage portion.

The sheet material of the present invention is used in the storage method of the present invention, and is characterized by having low air permeability or non-air permeability and moisture permeability. Specifically, the moisture permeability is 20
It is preferably 0 g / m ² / 24h or more. It may be composed of a continuous porous body of a hydrophobic resin having an air permeability of 7 cc / sec · cm ² or less (excluding 0), preferably a porous polytetrafluoroethylene sheet, or a high-density cloth. Is also good. Alternatively, a non-breathable sheet material in which at least one surface of a continuous porous body of a hydrophobic resin is coated with a hydrophilic resin may be used. Also, the sheet material of the present invention, on at least one side of these sheet materials,
A reinforcing cloth may be laminated.

[0015] The storage device of the present invention has a storage having a storage unit for storing food, a cooling device for flowing cool air into the storage, and an inflow of cold air from the cooling device is blocked. And a sheet material defining a storage part of an allowable atmosphere. The storage section is preferably a space defined by the sheet material of the present invention, and may further include a humidifying unit.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of a storage method according to the present invention and a storage device for performing the storage method will be described with reference to FIG.

A storage unit 4 defined by a sheet material 2 is formed in a storage 1 serving as a housing of the storage device, and can store objects such as fruits in the storage unit 4. A cooling device 5 is attached to the ceiling of the storage 1 so that cold air is blown into the portion 3 outside the storage 4 and ventilation is performed. The storage 1 is provided with an entrance / exit door 6, and a portion corresponding to the door 6 of the sheet material 2 is provided with a slit 2 a which can be opened / closed for entrance / exit.

The cooling device 5 is of an on-off type in which an upper limit and a lower limit are set so that the storage temperature becomes an optimum storage temperature on average. I have. Although the cooling device 5 used in the storage device of the present invention does not exclude the device controlled by the inverter, an on / off type is preferably used at a low cost.

The sheet material 2 blocks the inflow of cold air,
The entry and exit of moisture are used to form a permissible space, and a sheet material having low air permeability or non-air permeability and having moisture permeability is used. Specifically, JIS L 109
9 The moisture permeability measured based on the B-2 method is 200 g /
m ² / 24h or more, preferably 500 g / m ² / 24h
Or, more preferably 2000g / m ² / 24h or more, JIS L 1096 A measured air permeability on the basis of the method (air volume) is, 0~7cc / sec · cm ^2, preferably 0~3cc / sec · cm ² is fine. still,
With the air permeability within the above range, the upper limit of the moisture permeability is 200,000 g /
Sheet materials up to about m ² / 24h can be manufactured.

The material of the sheet material 2 is not particularly limited as long as it satisfies the above requirements. Examples of the sheet material having low air permeability include, for example, minute holes communicating between the front and back of the sheet. Continuous porous body; high-density fabrics such as woven fabric, knitted fabric, and nonwoven fabric having a small gap between yarns or fibers. Examples of the non-breathable sheet material include those obtained by coating or impregnating the continuous porous body or the high-density cloth with a hydrophilic resin.

Here, the continuous porous body is a continuous porous body made of a known hydrophobic resin, for example, a polyolefin resin-based porous sheet such as polyethylene or polypropylene; polytetrafluoroethylene (PTFE), tetrafluoroethylene or the like. Examples include fluororesin-based porous sheets such as ethylene / hexafluoropropylene copolymer, polyvinyl fluoride, and polyvinylidene fluoride. Among these, a porous PTFE sheet obtained by extruding PTFE after paste extrusion is preferably used because a sheet material satisfying the above requirements for moisture permeability and air permeability can be easily obtained.

The porous PTFE sheet is, for example, a molded product of a paste obtained by mixing PTFE fine powder with a molding aid, as described in Japanese Patent Publication No. 51-18991, for example, as to its production method and microstructure. After removal of the molding aid, it is obtained by stretching at a high temperature and a high speed and, if necessary, baking. In the case of uniaxial stretching, the nodes (folded crystals) are formed into an island shape thin at right angles to the stretching direction. The fibrils (straight-chain molecular bundles which are obtained by unraveling the folded crystal by stretching) are oriented in the stretching direction so as to connect the nodes. The space between the fibrils or the space defined by the fibrils and the nodes has a fibrous structure having holes. Also,
In the case of biaxial stretching, fibrils spread radially, and the nodes connecting the fibrils are scattered in islands, forming a spider web-like fibrous structure with a large number of spaces defined by fibrils and nodes. . The sheet having such a fibrous structure is a continuous porous body in which pores formed as fibril gaps communicate with each other in the sheet thickness direction.
The porosity and the pore diameter can be adjusted by the stretching ratio at the time of producing the continuous porous body. Therefore, the stretching ratio may be appropriately selected so as to satisfy the above air permeability and moisture permeability. Generally, the average pore size of the porous chamber PTFE sheet is 0.01 to 1
The range may be 0 μm, preferably 0.1 to 1 μm. If the average pore diameter is smaller than 0.01 μm, manufacturing difficulty is involved, and if it exceeds 10 μm, the air permeability becomes too large. The porosity is preferably 50 to 98%, more preferably 60 to 95%. If the porosity is less than 50%, it is difficult to secure the necessary moisture permeability, while if it exceeds 98%, the strength of the film is reduced.

The high-density fabric may be any of a woven fabric, a knitted fabric and a non-woven fabric having a breathability and a moisture permeability satisfying the above requirements, and known fibers such as polyester and nylon may be used as constituent fibers of the fabric. Can be.

When it is desired to make the air permeability almost zero (non-air permeable) as the sheet material 2, the continuous porous body or the high-density cloth coated with a hydrophilic resin may be used. The sheet material coated with the hydrophilic resin is formed by laminating a hydrophilic resin layer on the continuous porous body or the high-density cloth, and in some cases, the pores of the continuous porous body or the inter-gap or fiber of the high-density cloth. Inter-gap (hereinafter, when it is not necessary to distinguish between the inter-fiber gap and the inter-fiber gap,
Impregnated with the hydrophilic resin, the pores communicating with the front and back sides of the continuous porous body, which are the gas passages, are closed by the hydrophilic resin, or the gas passages in the high-density cloth. Is closed by the hydrophilic resin, and thus becomes non-breathable.
On the other hand, with respect to water vapor, due to the nature of the hydrophilic resin, the water vapor can adhere to the surface, and further, by diffusing in the hydrophilic resin, as a result, the water vapor permeates to the opposite side. That is, moisture permeability can be exhibited.

As the hydrophilic resin to be impregnated, a polymer having a hydrophilic group such as a hydroxyl group, a carboxyl group, a sulfone group, an amino group, a cyano group, etc., which has water swelling or water insolubility is used. Specifically, a hydrophilic polymer such as a polyvinyl alcohol resin, a cellulose acetate resin, a cellulose nitrate resin or the like, at least partially crosslinked, a polyamino acid resin, a polyurethane resin, a hydrophilic fluorine-containing resin, a hydrophilic silicone resin, or the like. As an example, a polyurethane resin is particularly preferably used in consideration of workability, moisture permeability, and the like.

Here, as the polyurethane resin, there is a thermosetting resin comprising a urethane prepolymer obtained by reacting a highly hydrophilic polyol with a polyisocyanate compound and a curing agent thereof. In this case, a polyoxyalkylene polyol such as polyethylene glycol is used as the polyol. As the curing agent, a diol or a diamine is used. Further, a moisture-curable hydrophilic polyurethane resin can also be used.

The coating of the hydrophilic resin layer may be performed by applying a hydrophilic resin to at least one surface of the continuous porous body or the high-density cloth, or may be applied to a hydrophilic resin solution by the continuous porous body or the high-density cloth. It may be performed by immersing a high-density cloth. When coating is performed on only one surface, the surface may be the inside of the storage unit 4,
The outer surface may be used. After the filling of the hydrophilic resin, it may be appropriately integrated with the continuous porous body or the high-density cloth by reaction curing and heat fusion. The resin that has entered the pores of the porous body or the gap between the yarns of the high-density fabric serves as an anchor, and thus can be integrated without using an adhesive or the like. However, when the affinity between the continuous porous body or the high-density cloth and the hydrophilic resin is low and integration is difficult, a treatment for increasing the hydrophilicity of the continuous porous body or the high-density cloth may be performed in advance, or bonding may be performed. It may be surface-treated with an agent or the like.

The thickness of the sheet material 2 may be any thickness that satisfies the above requirements for moisture permeability and air permeability, and a thickness that can secure the strength required for handling may be appropriately selected according to the material. Since the sheet material 2 has moisture permeability, there is no occurrence of dirt or mold due to dew condensation or the like, but the sheet material 2 becomes dirty by long-term use. When soiled, it is preferable to have strength enough to withstand multiple washings so that it can be washed and reused.

The sheet material having the above-described structure may be used alone as it is, but a sheet obtained by laminating a reinforcing cloth for improving handleability and strength may be used as the sheet material 2.

The reinforcing cloth is laminated to protect the above-mentioned sheet material (a continuous porous sheet or a sheet in which a high-density cloth is impregnated with a hydrophilic resin). The material is not particularly limited as long as the property is not impaired, and a woven fabric, a knitted fabric, a nonwoven fabric, a net, or the like can be used. Specifically, a woven or knitted fabric such as nylon taffeta or nylon tricot knit is preferably used.

The lamination of the reinforcing cloth may be performed only on one side of the porous sheet or the high-density cloth, or may be laminated on both sides. When laminating only on one side, it may be inside the storage part 4 or outside. When the hydrophilic resin is applied only on one side, the reinforcing fabric may be laminated on the side on which the hydrophilic resin is applied or on the side on which the hydrophilic resin is not applied.

The method of laminating the sheet with the reinforcing cloth may be appropriately selected from laminating or sewing, depending on the material and type of the sheet material. Alternatively, both edges may be stitched or the like so as to overlap each other so as not to be displaced.

The total thickness of the sheet material 2 when the reinforcing cloth is laminated is not particularly limited as long as the sheet material does not impair the moisture permeability and air permeability and the washing property and the handling property are further secured. do not do.

The storage section 4 may be defined by suspending the sheet material 2 configured as described above from the ceiling of the storage 1 or a predetermined shape is defined by the aggregate. The storage section 4 may be defined by enclosing the skeleton with a sheet material, or a space defined by a storage object in which the storage object is directly covered with the sheet material 2. Is also good. When the storage unit 4 is formed as a space having a predetermined shape, a storage shelf or the like for arranging objects to be stored in the storage unit 4 may be appropriately installed. When only the storage target is covered, not only the storage target can be directly covered, but also a storage shelf, a storage box, or the like may be provided to cover the storage target. Such a covering method has an advantage that the storage unit 4 can be formed easily and easily. On the other hand, in the case where the storage section 4 is defined by defining a space having a predetermined shape, it is possible to prevent the sheet material 2 from directly contacting the object to be stored, so that storage in a cooling atmosphere can be more effectively achieved. it can. Further, even when used in combination with an aggregate or the like, by making the aggregate removable or foldable, the storage unit 4 is easily defined, assembled and disassembled as necessary, and food is not stored. When the storage device is not used, such as when the sheet material 2 is folded, the sheet material 2 can be closed without bulkiness, and handling is convenient as when no aggregate is used.

In FIG. 1, reference numeral 10 denotes a humidifier. In the storage of the present invention, it is not essential to provide a humidifier, but it is necessary to maintain a relative humidity of 80% RH or more in ice temperature storage of hydrated crops such as fruits and marine products.
It is preferable to provide for maintaining such high humidity. Although the humidifier 10 is installed in the storage unit 4 in FIG. 1, it may be installed outside the storage unit 4.

In the storage device having the above configuration, the cooling device is set to a predetermined temperature and operated. here,
The predetermined temperature to be set needs to be appropriately selected depending on the type of the material to be stored. In the case of ice temperature storage, the temperature is in the range of 0 ° C. to the freezing temperature (the temperature at which freezing starts), and is a minus temperature just before the freezing. For example, Japanese pear (freezing point is −2.7
℃) -1.0 to -2.0 ℃, lettuce, salad vegetables, tomatoes etc. (all have a freezing point of -1.0 to -1.5 ℃) -0.5 to -1.0 ℃ is there.

When the cooling device 5 is of the on-off type, the energizing voltage is turned on and off so that the average temperature in the storage 1 becomes the set temperature. In the ON state, the cool air blown from the cooling device 5 first cools the outer portion 3 of the sheet material 2,
Cold air is introduced into the storage section 4 in accordance with the air permeability of the sheet material 2 to be cooled. When the air permeability of the sheet material 2 is 0 (in the case of a non-air permeable sheet material), the cool air in the outer portion 3 is conducted by the heat conduction of the sheet material 2 and the inside of the storage section 4 is also cooled. That is, since the sheet material 2 blocks the cool air from flowing into the storage unit 4, only the cool air is introduced into the storage unit 4 through the restricted ventilation of the sheet material 2, or the non-breathable sheet material is not introduced. In the case of 2, a cooling atmosphere is formed in the storage section 4 by heat conduction. This not only helps to prevent evaporation and drying of the water content of the storage object, but also means that there is no convection when blowing cold air from one location, so that the inside of the storage unit 4 can be uniformly cooled. Furthermore, since the temperature in the storage unit 4 does not need to be directly affected by the temperature change due to the turning on and off of the cooling device 5, even if an on / off type cooling device is used, the difference between the set temperature and the maximum temperature or the minimum temperature is small. It is small and can be suppressed to about ± 0.5 ° C. Therefore, if the set temperature of the cooling device is set to the ice temperature of the object to be stored (a temperature in the range from 0 ° C. to the freezing temperature), storage similar to ice temperature storage can be achieved.

Further, since the sheet material 2 has moisture permeability, the humidity in the storage section 4 can be kept constant.
That is, the relative humidity is also important for maintaining the freshness of the stored material, and it is necessary to maintain the relative humidity of the fruit at 85 to 95%. However, as in ice temperature storage, at about -3.0 to 0 ° C,
In order to maintain such high humidity, it is necessary to supply moisture.

Here, as shown in FIG. 1, when a humidifier 10 is provided in the storage unit 4 as a means for supplying moisture, excess moisture in the storage unit 4 is discharged to the outside of the storage room. Then, the air can be exhausted from the exhaust port. Thereby, the humidifier 10
Accordingly, it is possible to prevent dew condensation on the inner wall surface of the storage unit 4, that is, the sheet material 2 without performing high-precision control so as not to cause an excessive humidification state. On the other hand, when the humidifier 10 is disposed outside the storage unit 4, moisture is supplied into the storage unit 4 due to the moisture permeability of the sheet material 2, and the humidity in the storage unit 4 can be maintained. it can. When the humidifier 10 is provided, it is preferable to operate the humidifier 10 while delicately controlling the operation of the humidifier 10 with a humidity sensor.
When the storage device of the present invention is used, even if the humidifier 10 is slightly over-humidified, the excess moisture is balanced by the moisture permeability of the sheet material 2 and dew condensation is caused by the ventilation action of the cooling device 5. Therefore, the requirements for the accuracy of the humidity sensor need not be as strict as in the past. When the humidifier 10 is installed inside or outside the storage unit 4 as described above, the dew condensation occurs due to the moisture permeability of the sheet material 2 unless the moisture inside the storage 1 as a whole exceeds the saturated steam pressure. Can be prevented. Moreover, since the cooling device 5 is of a ventilation type,
There is almost no situation in which the entire storage 1 exceeds the saturated steam pressure.

Further, according to the storage device of the present invention, even when the humidifier such as the humidifier 10 is not provided, a certain amount of moisture is secured by utilizing the moisture of the outside air as follows. can do. That is, when the cooling device 5 having relatively large power with respect to the size of the storage 1 is used, the ON time of the compressor can be shortened and the OFF time can be increased. In this case, since the warm outside air having moisture enters the storage 1 while the compressor is off, the relative humidity increases as the temperature in the storage 1 increases. In this case, via the sheet material 2,
The moisture of the outer part 3 can be pumped into the reservoir 4.

Further, the storage method and storage device of the present invention have the following effects depending on whether or not the sheet material 2 used to define the storage section 4 has air permeability. First, sheet material 2
When a low-permeability sheet material such as a continuous porous body or a high-density cloth is used, oxygen necessary for respiration of food cells is appropriately supplied and generated from stored objects such as vegetables and fruits. It is also possible to exhaust a gas that is not preferable for keeping the freshness of the storage object such as ethylene gas from the inside of the storage unit 4 to the outside of the storage unit 4.

On the other hand, when the sheet material 2 is a nonporous sheet material obtained by coating or impregnating a continuous porous body or a high-density cloth with a hydrophilic resin, external air, particularly oxygen, is stored in the storage section 4. Can be prevented from flowing into
Oxidation of the stored material can be prevented. Therefore, it is suitable for storage of an object to be stored in which oxidation is a problem.

Although the above description has been made mainly with respect to crops which are suitable for storage at ice temperature as the material to be stored, the storage method and storage device of the present invention are not limited to crops, and crabs and the like which can maintain freshness by ice temperature storage. It can also be applied to the storage of seafood and meat. This is because the storage of fish and shellfish and meat can be preserved for a long period of time while maintaining freshness by adjusting the relative humidity and storing them at the optimum ice temperature (the temperature immediately before freezing). Further, the present invention can be applied not only to ice temperature storage but also to storage in which the storage temperature is reduced from 0 ° C. to about refrigeration. Even in this case, if the storage method and storage device of the present invention are used, the temperature,
This is because humidity can be controlled stably, and storage in a cooling atmosphere that maintains necessary moisture can be achieved without worrying about dew condensation or the like. Further, the present invention can be applied to the storage of brown rice, which does not require a high-humidity atmosphere and has a storage temperature of 10 ° C. or more instead of the ice temperature.

[0044]

[Temperature and Humidity Stability] In the storage device shown in FIG. 1, in the storage unit where the storage unit is formed by sheet material (Example) and when the sheet material is not used (Comparative Example) The temperature and humidity stability in the storage was investigated.

The sheet material used in the embodiment has a thickness of 30 μm.
m, porosity 80%, continuous pore P having an average pore diameter of 0.2 μm
A 70-denier nylon plain woven fabric on one side of a TFE sheet and a 20-denier nylon warp knitted fabric on the other side were used. The set temperature of the on-off type cooling device was -1.2 to -1.3 ° C, and the humidifier was operated.

The measurement was performed for two days starting in the evening, and the temperature and humidity were measured every 30 minutes. FIGS. 2 and 3 show graphs showing changes in temperature and humidity in the example and the comparative example, respectively. 2 and 3, the vertical axis represents temperature (° C.) and relative humidity (%), and the horizontal axis represents actual time. Table 1 shows the maximum, minimum, and average values of temperature and humidity throughout the measurement period.

[0047]

[Table 1]

From the comparison between FIG. 2 and FIG. 3, it can be seen that the temperature change and the humidity change are smaller in the storage section defined by the sheet material than in the storage section where the storage section is not defined. Also,
From Table 1, the average values of the temperature and the humidity were almost the same regardless of the presence or absence of the sheet material, but the difference between the maximum value and the minimum value was small in the storage section defined by the sheet material.

Therefore, the sheet material has a function of improving the control levels of temperature and humidity. In the storage device of the present invention in which the storage section is defined by the sheet material, the temperature and humidity can be set as in ice temperature storage. It can be seen that severe storage can be easily provided at a lower cost than before.

[Storability of Food] With respect to the storage devices of the above Examples and Comparative Examples (both without a humidifier), the temperature of the cooling device was set at 2 ° C., and pears were stored. still,
In the examples, the sheet material was defined by using an aggregate to define a storage portion having a predetermined shape and stored therein.

After 60 days, 90 days, 12
After 0 days, the change in weight and the change in appearance of the stored material (pear) were examined. Regarding the weight change, the weight after storage for a predetermined number of days is measured, and the reduction ratio (%) with respect to the weight at the start of storage.
Was examined. Regarding the change in appearance, the surface properties were visually observed. If the surface properties were changed, the internal state was further examined. Table 2 shows the results.

[0052]

[Table 2]

In addition, the yam is stored instead of the pear,
A change in weight and a change in appearance after 0 and 90 days were examined. The cooling conditions were set at 2 ° C. as in the case of pear, and no humidifier was used. Table 3 shows the results.

[0054]

[Table 3]

According to Tables 2 and 3, according to the storage device of the present invention in which the storage room is defined by the sheet material, it is possible to prevent the food from drying, prevent the inside from being deteriorated, and maintain the freshness for a long period of time. We can see that we can do it.

[0056]

According to the storage method and the storage device of the present invention, even if an inexpensive on-off type cooling device is used, a stable cooling atmosphere can be provided with small changes in temperature and humidity. Therefore, a storage method in which temperature and humidity are set strictly, such as ice temperature storage, can be implemented more easily and cheaply than before, and food can be preserved for a long time while maintaining freshness.

According to the storage method and the storage apparatus of the present invention, even when a humidifier is used, excess moisture in the storage section is transmitted to the outside of the storage section through a moisture-permeable sheet material. Since it can be released and further released to the outside of the storage by the ventilating action of the cooling device, there is no worry about condensation or the like, and there is no worry about mold generation even when used for long-term storage. Moreover, since the sheet material defining such an excellent storage portion can be washed when it is soiled, and can be re-defined by appropriately assembling and using, the storage portion is easy and convenient from the viewpoint of maintenance. is there. Therefore, the storage device of the present invention can be purchased individually by a farmer or the like and used for long-term storage of food.

[Brief description of the drawings]

FIG. 1 is a diagram showing one embodiment of a storage according to the present invention.

FIG. 2 is a graph showing a measurement result of temperature and humidity in a storage unit of the storage device according to the embodiment of the present invention.

FIG. 3 is a graph showing measurement results of temperature and humidity in a storage of a storage device according to a comparative example.

[Description of Signs] 1 Storage 2 Sheet material 4 Storage 5 Cooling device 10 Humidifier

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Yoshihiro Chikamori 1-42-5 Akatsutsumi, Setagaya-ku, Tokyo Inside Pangore-Tex Co., Ltd. (72) Emi Yoshioka 1-42-5 Akatsutsumi, Setagaya-ku, Tokyo Ja Inside Pangoretex Co., Ltd. (72) Inventor Satoshi Yamamoto 1-42-5 Akatsutsumi, Setagaya-ku, Tokyo Japan Pangooretex Co., Ltd.

Claims (13)

[Claims] 1. A method of storing food in a storage room into which cold air is appropriately introduced, wherein the storage unit has an atmosphere in which the inflow of the cold air is blocked but the inflow and outflow of moisture are allowed, and the food is stored in the storage unit. A method for storing food, characterized by storing food. 2. A food storage method using a sheet material having low air permeability or non-air permeability and moisture permeability as a means for forming the storage section according to claim 1. 3. A sheet material used in the storage method according to claim 2. 4. A sheet material according to claim 3 moisture permeability is 200g / m ² / 24h or more. 5. The sheet material according to claim 3, wherein the sheet material comprises a continuous porous body of a hydrophobic resin. 6. The sheet material according to claim 5, wherein the continuous porous body is a porous polytetrafluoroethylene sheet. 7. A high-density fabric formed of a high-density cloth.
Sheet material described in. 8. The sheet material according to claim 3, wherein the air permeability is 7 cc / sec · cm ² or less (not including 0). 9. The sheet material according to claim 3, wherein at least one surface of the continuous porous body of the hydrophobic resin is coated with a hydrophilic resin. 10. A sheet material in which a reinforcing fabric is laminated on at least one side of the sheet material according to claim 3. 11. A storage having a storage unit for storing food, a cooling device for flowing cool air into the storage, and an atmosphere in which the flow of cold air from the cooling device is cut off but moisture is allowed to enter and leave. A storage device comprising: a sheet material defining a storage unit. 12. The storage section is a space defined by the sheet material according to any one of claims 3 to 10.
The storage device according to claim 1. 13. The storage device according to claim 11, further comprising a humidifying unit.