JPH03148469A - Method for storage of vegetables, fruit, and the like, and cold-storage container therefor - Google Patents

Abstract

PURPOSE:To keep precooled vegetables, fruit, etc. satisfactorily fresh by a method wherein vegetables, fruit, or the like to be precooled contained in a container and covered with a lid is precooled for a short time by vacuum precooling so as to shut off a flow of air between the inside of the container and the outside. CONSTITUTION:Containers 1, each containing vegetables, fruit, or the like to be precooled and closed by a lid 2 fitted on from the outside, are laid in tiers, without blocking up outer openings 9 in each, in a vacuum chamber. The pressure inside the vacuum chamber is reduced so that the air inside the container is forced out of it through inner openings 8, U-shaped groove 7, and the outer openings 9; part of the moisture contained in the object for precooling is evaporated, thus loss of the latent heat of the evaporation effecting precooling. By restoring the pressure inside the vacuum chamber an inflow of air is made to occur from the outside into the container through the outer openings 9, the U-shaped groove 7, and the inner openings 8. After rise of the pressure inside the container to almost the same level as outside, air does not flow easily, since the air inside the container has a higher density than the air outside it because of lower temperature inside the container than outside. Moreover, since film-frictional resistance develops when air flows on a thin layer of air attaching to the surfaces of the U-shaped grooves 7, the flow of air between the inside of the container and the outside is shut off.

Description

Detailed Description of the Invention (Industrial Field of Application) The present invention is a method for storing cold objects such as vegetables and fruits in a cold container consisting of a container body and a lid made of foamed synthetic resin, and keeping the lid closed. By reducing the pressure inside the vacuum chamber, it is possible to forcefully exhaust the inside of the container, and after pre-cooling, by restoring the pressure inside the vacuum chamber, the inside of the container can also be returned to atmospheric pressure.Vegetables, fruits, etc. This paper relates to a storage method for storage and a cold storage container used for the storage method.

[Conventional technology]

As a cold storage container used in the conventional vacuum precooling method, the 7th
As shown in the figure, the container is made of a container body A made of foamed synthetic resin and a lid B which is also made of foamed synthetic resin and is fitted onto the container body A in an airtight manner. Some have a through hole C for ventilation with a diameter of about 10 mm. Then, store cold objects such as vegetables and fruits in the container main body A of such a cold storage container, close the lid, and place it in a vacuum chamber. The air inside the container is forcibly exhausted through the through hole C to evaporate some of the moisture held in the object and remove the latent heat of vaporization, thereby pre-cooling the object inside the container. .

In addition, the present applicant has developed a cold storage container that is a major improvement over such general technology and is used in the vacuum precooling method, in which an opening with an orifice effect is provided near the joint between the container body and the lid. It has already been disclosed as No. 616.

[Problem to be solved by the invention]

However, in the former type of cold storage container, once the pressure inside the vacuum chamber is restored and the inside of the container is returned to atmospheric pressure,
Since the vent hole is large in diameter, air can freely flow inside and outside the container through the hole, causing the temperature of the pre-cooled material to gradually approach the outside temperature, which may impair the pre-cooling effect. However, there is a problem in that oxygen is supplied to the pre-chilled cold food, making it impossible to maintain the freshness of the pre-cooled cold food for a long time.

Therefore, after pre-cooling, this ventilation through-hole is sealed from the outside with tape or the like to block the flow of air inside and outside the container, but this process takes a considerable amount of time and is troublesome.

In addition, the latter method does not require sealing the opening of the container, resulting in a significant reduction in the amount of work, and is attracting much attention from an industrial perspective. However, due to its structure, it tends to require a lot of trial and error in selecting the orifice shape, and there are also problems in that it is difficult to increase the substantial distance of the orifice as a ventilation communication section. The inventor is
Furthermore, it is a high-performance product that can bring the inside of the container to the desired reduced pressure state in a short time, and after pre-cooling, can effectively utilize the fitting means provided at the joint between the container body and the lid to block the flow of air inside and outside the container. The present invention was developed with the aim of research that would improve the reliability of freshness preservation by providing a cold storage container that would improve long-distance and long-distance transportation, as well as long-term storage.

In view of the problems of the prior art, the present invention provides vegetables,
Store cold items such as fruits in a container and keep the lid closed.
This cold material can be precooled in a short time using the vacuum precooling method.
Moreover, after pre-cooling of the frozen food, the free flow of air inside and outside the container can be virtually blocked without sealing the communication parts inside and outside the container, making it possible to maintain the freshness of the cold food. The purpose of this paper is to provide methods for storing vegetables, fruits, etc. that can be stored, and also to provide cold containers that can be used in such storage methods.

Also, when closing a highly airtight cold storage container, the air trapped inside the container is temporarily compressed and the internal pressure of the container increases, but if the container is highly airtight, there is no way for the pressurized air to escape. As a result, the lid that is supposed to be closed may partially open or be difficult to close, making it difficult to efficiently close the lid. This is especially a big problem when trying to automate using machines. The present invention also aims to provide a cold storage container that can easily close the lid even in such cases, but can maximize its heat insulation performance without affecting the airtightness after closing the lid. It is.

[Means for Solving the Problems] In order to solve these problems, claim 1 of the present invention is to store cold objects such as vegetables and fruits inside a cold storage container consisting of a container body and a lid made of foamed synthetic resin. By storing the container in a vacuum chamber with the lid closed and reducing the pressure in the vacuum chamber, when the lid of the required length provided at the appropriate location of the container is closed, the container is The air inside is forcibly evacuated against the viscous resistance and membrane friction resistance that occur when the air flows through the ventilation passage, and the cooled object is precooled.
After that, the pressure inside the vacuum chamber is restored to return the inside of the container to atmospheric pressure, and after the container is taken out from the vacuum chamber, the viscous resistance of the ventilation communication part and the film friction resistance effectively prevent the inflow of outside air into the container. The main point is how to store vegetables, fruits, etc. by blocking the In addition, in claim 2, in claim 1, the cross-sectional area and/or length of the ventilation communication section is set such that when there is no pressure difference between the inside and outside of the container, air flows freely due to viscous resistance and membrane friction resistance. An example is shown in which it is formed to such an extent that it is substantially blocked. ″, in claim 3,
An example of a cold storage container used for storing vegetables, fruits, etc. is a container made of a foamed synthetic resin container body and a lid, and one of the joints between the container body and the lid has a fitting means. On the other hand, the other fitting means is provided with the other fitting means to be fitted into one of the fitting means, and when the container is closed, a ventilation communication part is formed between the one fitting means and the other to communicate with the inside and outside. A recessed groove of a required length extending in the length direction of the fitting means is provided on one and/or the other joint surface side of the fitting means, and furthermore, one end of this recessed groove is provided with a groove facing into the container. A cold storage container was constructed with an opening on the inner side and an opening on the outside facing the outside of the container at the other end. In claim 4, in claim 3, the concave groove is provided with the corner of the container sandwiched therebetween, and in claim 5, in claim 3 and claim 4, the concave groove is It has been exemplified that the area and/or length are formed to such an extent that free flow of air is substantially blocked by viscous resistance and film frictional resistance when there is no pressure difference between the inside and outside of the container.

[For production]

Then, by storing cold objects such as vegetables and fruits in such a cold container, closing the container, and placing the container as it is in a vacuum chamber, the pressure inside the vacuum chamber is reduced to remove the air inside the container. By forcibly exhausting the liquid to the outside through the ventilation communication part, a part of the moisture held in the cold object is evaporated, and the latent heat of vaporization is taken away, thereby pre-cooling the object.

In the process of reducing the pressure inside the container with the lid closed,
The inside of the container resists the film frictional resistance that occurs between the viscous resistance that occurs when air flows through the ventilation passage and the air layer that is thinly attached to the wall that forms the ventilation passage and does not flow. Forced exhaust is performed. After pre-cooling, when the pressure inside the vacuum chamber is restored, air outside the container flows into the container through the ventilation communication section, contrary to the above. and,
After the pressure inside and outside the container becomes almost the same, the container is filled with air, and the air inside the container has a high density because it is low in temperature, and the air outside has a low density because it is high in temperature. In addition to the viscous resistance of the ventilation passage and the film friction resistance, the flow of outside air into the container is virtually blocked, and the cold objects are not affected by the outside temperature. This prevents the risk that the precooling effect will be impaired due to the cooling effect, or that the freshness of the precooled cold food cannot be maintained for a long time due to the temperature increase due to respiration due to the supply of new oxygen to the cold food.

〔Example〕

The details of the method for storing vegetables, fruits, etc. according to the present invention will be further explained based on the cold storage container used therein.

FIGS. 1 and 2 show a first embodiment of such a cold storage container. In the figure, reference numeral 1 denotes a box-shaped container body made of foamed synthetic resin with an open top, and numeral 2 denotes a lid body also made of foamed synthetic resin that airtightly closes the upper opening of the container body 1. This cold container has a lid body 2 for a container body 1.
A fitting means is provided at the joint between the two so as to close and hang the two in an airtight state. In the illustrated first embodiment, a protruding strip 4 is provided along the inner surface of the upper surface of the side wall 3 of the container body l over the entire side wall 3, and a protruding strip 4 is fitted to the outer periphery of the lower surface of the lid body 2. The same grooved line 5 is provided over the entire outer periphery of the lower surface. When the container is closed, the grooved line 5 on the lid body 2 side is aligned with the raised line 4 on the side of the container body l.
At this time, the diagonal corners of the lid body 2 are placed between them so that a ventilation communication part 6 that communicates between the inside and outside is formed between the convex line 4 and the concave line 5. A groove 7 is provided between the outer surface and the bottom of the groove 5, and furthermore, this groove 7 is
A fan-shaped recess is formed on the inner surface of the grooved strip 5 at one end located on the inner surface side of the grooved strip 5, and an inner surface opening 8 is formed to face the inside of the container.
At the other end of the concave strip 5 located on the outer surface side, a fan-shaped recess is formed on the lower surface of the outer periphery of the lid body 2, and an outer surface side opening 9 is formed to face the outside of the container.
are provided for each. The cross-sectional area and/or length of this groove 7 is such that when the container is closed and there is no pressure difference between the inside and outside of the container, free flow of air is substantially blocked due to viscous resistance and membrane friction resistance. It is formed to the extent that Here, the boundary film frictional resistance is based on the boundary film theory that states that a thin layer of air that adheres to a certain surface cannot be removed even if the surrounding area is in a complete vacuum. This is the resistance created between air trying to flow around the outside.

Next, FIG. 3 shows a second embodiment of the cold storage container.

In this second embodiment, a groove 7 is provided from the upper surface to the outer surface between the corners of the protruding strip 4 provided on the side of the container body l, and the inner surface of the upper surface of the protruding strip 4 is communicated with the groove 7. As in the first embodiment, an outer side opening 9 is formed in a fan-shaped recess on the upper surface of the side wall 3 of the side opening 8 and the protruding strip 4, so that when the lid of this container is closed, the inside and outside of the container are communicated. A ventilation communication section 6 is provided.

Furthermore, FIG. 4 shows a third embodiment of the cold storage container.

In this third embodiment, a convex strip 4 on the upper side wall 3 of the container body l is used.
A groove 7 is provided from the upper surface of the protrusion 4 to the outer surface thereof in the length direction, and an inner surface opening 8 is formed on the upper surface of the protrusion 4 and an outer surface is formed on the upper surface of the side wall 3 of the protrusion 4. Side entrance 9
is the same (as in the first embodiment, formed in a fan-shaped recess,
A ventilation communication section 6 is provided.

In these cold containers, a recessed groove 7 extending in the length direction of the fitting means is provided on the joint surface side of the fitting means at a proper place provided at the joint part of the container body lζ lid body 2, and one end of this recessed groove 7 is provided. An opening 8 on the inner side facing into the container from the other end and an opening 9 on the outer side facing outside the container from the other end are formed to provide a ventilation communication part 6 that communicates between the inside and outside when the container is closed. . For this reason, the container body l is filled with cold objects such as vegetables and fruits, and the lid body 2 is fitted onto the container body l to close it, and at least the outer opening 9 is closed in the vacuum chamber. When the vacuum chamber is depressurized to, for example, about 5i+mHg, the air inside the container flows from the inner surface port 8 through the groove 7 to the outer surface port. By forcing air out of the container from 9 and evaporating some of the moisture held in the cooled objects stored in the container and removing the latent heat of vaporization, it is possible to pre-cool it to about 2 to 5 degrees Celsius. be. After this pre-cooling operation, the vacuum chamber ♀
When the pressure inside the chamber is restored, air outside the container flows from the outer opening 9 through the groove 7 and into the container from the inner opening 8. After the pressure inside and outside the container becomes almost the same, the container is filled with air, and the air inside the container has a high density due to its low temperature, while the air outside has a low density due to its high temperature. In addition to becoming difficult to flow,
Due to the film friction resistance that occurs between the viscous resistance that occurs when air flows through this groove 7 and the air layer that is thinly attached to the wall surface of the groove 7 and does not flow, the free flow of air inside and outside the container is reduced. The flow is essentially cut off.

Regardless of the illustrated embodiment, the protruding strips 4 and concave strips 5, which serve as one and the other of the fitting means, are not provided over the entire outer circumference of the container, but are provided only at the four corners with corner portions in between, or It can also be provided on a pair of sides. In addition, various shapes can be considered for the inner side opening 8 and the outer side opening 9 other than the fan-shaped recess shown in the figure, but the cross-sectional shape effectively generates viscous resistance and film frictional resistance. If the shape is formed into a slit shape, for example, the air inside the container can be easily deaerated when forcibly evacuated (and when the pressure difference between the inside and outside of the container no longer exists, the flow of air can be substantially blocked). Furthermore, the groove 7 can be provided across both the one and the other of the fitting means, that is, both the protrusion 4 and the groove 5.

Next, FIG. 8 shows the results of an experiment comparing the cold storage performance of the container with other arbitrary containers after precooling the cold objects stored in the container using the vacuum precooling method. Regarding the results of this experiment,
The vertical axis represents temperature (°C), and the horizontal axis represents time. and,
■ indicates the outside temperature change value, ■ is the cardboard box, ■ is the seventh
Figure 5 (a) shows a cold storage container consisting of a container body A made of foamed synthetic resin and a lid B, which is shown in the figure, and the lid B has four through holes C for ventilation with a diameter of 10++ ug+. As shown, the concave groove 7 radius a is 5If111. The height is 4 mm, the length b from the bent part to the end of the groove 7 is 30 mm, the radius C of the inner opening 8 and the outer opening 9 is 2 mm, and the height is 2111.
1, the length is 4 as shown in Figure 5 (b).
A cold insulating container that is an example of the present invention, in which four ventilation communication portions 6 are provided between the corners of the container main body 1 side or the two lids of the cold insulating container molded to 40 am, width 320 mm, and height 185 mm. , ■ is the concave groove 7 radius d as shown in Figure 6 (a).
■, height is 3m, length e is 60mm, inner side opening 8
In addition, the radius f of the outer surface side opening 9 is set to 20M, and the height is set to 2mm, so that the length is 440mm as shown in Fig. 6 (b).
, A cold insulating container which is also an example of the present invention, in which four ventilation communication portions 6 are provided at positions other than the corner portions of the container body l side or the two lids of the cold insulating container molded to have a diameter of 320 mm and a height of 185 mm; The figure shows the case where a cooled object is stored in a container body made of foamed synthetic resin and pre-cooled, and then a lid made of foamed synthetic resin is fitted on the outside and the lid is closed. 2 kg of spinach was stored and pre-cooled. As a result, as can be seen from the comparative experimental data in Figure 8, after pre-cooling the anion-chilled object to point 0 using the vacuum pre-cooling method, the cold storage performance of the anion-chilled object was as follows. Compared with case (2), it was found that the cold storage containers (2) and (2) according to the present invention have almost the same cold insulation effect as the completely sealed cold container shown in (3).This is due to the length of the groove 7, Due to the convergence and height, viscous resistance and film frictional resistance occur in the air passing through this groove 7, and compared to the case where a large diameter hole such as a conventional ventilation hole is provided, the air passing through the groove 7 is Because the flow of air inside and outside the container is blocked,
This is thought to be because the cool temperature inside the container can be maintained without being affected by the outside temperature. The maintained temperature was almost the same as that of a completely sealed cold container. In addition, in order to increase the viscous resistance and film frictional resistance, the groove 7 can be bent as shown in FIGS. Consideration may be given to reducing the size or increasing the length. The effect of this groove 7 can be effectively exhibited by increasing the diameter of the groove, reducing the cross-sectional area, or shortening the length, so it is necessary to take these requirements into consideration. The number of grooves, as well as the cross-sectional area and length of the grooves may be set appropriately.

Next, FIG. 9, FIG. 1O, and FIG. 1I show other embodiments of the cold storage container. In this cold storage container, a protruding strip 4 is provided along the inner surface of the side wall 31 of the container body l over the entire side wall 3, and a concave strip that fits into the protruding strip 4 is provided on the outer periphery of the lower surface of the lid body 2. 5 is similarly provided over the entire outer periphery of the lower surface. When the container is closed, the concave strips 5 of the two lids are fitted into the convex strips 4 on the side of the container body l, but at this time there are no grooves between the convex strips 4 and the concave strips 5. The size relationship and/or positional relationship between the protrusions 4 and the grooves 5 is determined so that a gap IO as shown in FIG. 11 is formed on the upper surface side of the protrusions 4 and on the outer surface side of the protrusions 4.

In the figure, reference numeral 11 denotes an interior convex portion that is installed in the upper part of the opening of the container body 1 along the inner surface of the side wall 3 of the container body 1 provided below the lid 2. By providing this interior convex portion 11, when the container is closed, a gap IO is formed over the entire outer periphery of the container. Next, 8
．． 9 is a container similar to the cold storage container according to the present invention, which is connected to the gap IO and has diagonal corner portions of the container sandwiched therebetween, and is also displaced in position and formed into a fan-shaped recess. There is an inner opening facing inward and an outer opening facing outside the container. Here, the cross-sectional area and/or length of this gap IO is determined by the viscous resistance that occurs between the air trying to pass through it, and the thin adhesion to the upper and outer surfaces of the protruding strip 4 and the bottom and inner surfaces of the grooved strip 5. If there is no pressure difference between the inner surface opening 8 and the outer opening 9, the air will flow due to film frictional resistance that occurs between the air layer that does not flow and the air that passes through this layer. is formed to such an extent that it is substantially blocked. Then, when cold objects such as vegetables and fruits are stored in the container body l and the lid body 2 is fitted on the outside and the lid is closed,
There is a gap IO between the convex line 4 inside the container body and the concave line 5 on the two lids.
is formed over the entire outer periphery of the container, and in addition, as shown in FIG.
As shown in FIG. 1θ and FIG. 11, the inner surface side port 8 and the outer surface side port 9, which are provided at the same corner and displaced in position, communicate with this gap IO.

That is, in this cold storage container, the ventilation communication portion 6 is formed from the gap IO, the inner surface side opening 8, and the outer surface side opening 9.

Next, FIGS. 12 and 13 show still another embodiment of the cold storage container. The cold storage container shown in FIG. 12 has a ventilation communication section 6 that communicates between the inside and outside of the container, which is composed of a container body I and a lid body 2 made of foamed synthetic resin, in a stepped section of the bottom plate 12 on the outer periphery of the container body L. Attach a pipe material 15 of a required length to the mounting port 14 with one end thereof facing into the container from the mounting port 14 that is drilled into the container from the outside of the container. It was erected. And pipe material 15
The cross-sectional area and/or length of the inner surface of the container are set to such an extent that free air flow is substantially blocked by viscous resistance and membrane friction resistance when there is no pressure difference between the inside and outside of the container. There is. In addition, the cold storage container shown in FIG. 13 has an opening 16 of a required length that communicates with the inside and outside of the container made of a foamed synthetic resin container body 1 and a lid 2 at appropriate locations to provide a ventilation communication section 6. It was established. The cross-sectional area and/or length of this opening 16 is also formed to such an extent that free flow of air is substantially blocked by viscous resistance and membrane friction resistance when there is no pressure difference between the inside and outside of the container. .

Here, the concave groove 7 or the gap IO, the inner surface side opening 8, the outer surface side opening 9, the pipe material 15, and the opening! It is also possible to form a cold storage container by appropriately combining two or more of 6.

Next, FIG. 19 shows the results of a comparative experiment on the cold storage performance of various containers after precooling the cooled objects stored in the containers by the vacuum precooling method.

Regarding the experimental results, the vertical axis represents temperature (° C.) and the horizontal axis represents time (hr). ■' is an A flute with a surface layer of 220 kraft, a middle core of SCP 125, and a back layer of kraft 250, as shown in Figure 14.The internal dimensions are 405 mm in length, 295 a+m in radius, 135 mm in height, and convergence on both sides. FGIla+, a cardboard box with a handle hole of height 30++ua, ■' is a 55x polystyrene molded product shown in Fig. 15, all of which have a wall thickness of 20mm, and the inner dimensions are length 405mm, radius 295mm, and height. A refrigerated container that can be closed completely airtight, consisting of a 135 mm container body and a lid.■' is the same as this refrigerated container, but the bottom plate has a diameter 6
A cold storage container with four through holes for ventilation of mm, ■' is ■
As shown in Fig. 16 (a), use the same cold storage container as shown in Figure 16 (a), with the width g of groove 7 being 5 mm, the height being 5 am, and the length h from the bent part to the end of groove 7 being 100 mm. The inner opening 8 and the outer opening 9 have a radius i of 2 mm and a height of 2 mm, respectively, and as shown in FIG. A cold insulating container is an example of the present invention in which four ventilating communication parts 6 are provided between the two. , the length j from the bent part to the end of the groove 7 is 100
The radius k on the opening side of the inner surface opening 8 and the outer surface opening 9 is 30 mm, the height l is 3 am, the radius m on the bent side and the connecting side of the groove 7 is 15 mm, and the heights n, p.
In one example of the present invention, four ventilation communication portions 6 are provided with a diameter of 2 mm each, and four ventilation communication portions 6 are provided between the corners of the container body l side or the two lids, as shown in FIG. 16(b). A certain cold container, ■
' is the same as the cold storage container in ■', and as shown in Fig. 12, pipe materials 15 with an outer diameter of 6 mn + 1 inner diameter of 5 am and a length of 120 mm are erected from the outside of the four corners of the bottom plate 12 of the container body 1. A cold storage container provided with a ventilation communication part 6,■
' is the same as the cold storage container shown in ■' in Figure 18 (a) and (b).
As shown in (c), the radius of the protrusions 4 inside the container body is set to lOm.
As n+, there is a gap of 2mm+ between the upper surface side and the outer surface side of this convex portion 9! 0 is formed, and the inner opening 8
The radius r is 30, and the height S is 2 mm.

In addition, a case where a cold storage container is used in which the outer opening 9 has a radius t of 20 mm and a height U at two intervals, and is formed in the positional relationship shown in (a) and provided with a ventilation communication part 6. are shown respectively. Then, add 3 Chinese vegetables to each container.
kg was stored and precooled. As a result, the comparative experimental data shown in FIG.
It can be seen that the container of ``■''■'', which is provided with a ventilating communication portion inserted inside and outside so that the viscous resistance and film frictional resistance are effectively exhibited, is significantly superior. Here,■′
The container burst during pre-cooling, making it impossible to measure experimental data.

〔Effect of the invention〕

In the method for storing vegetables, fruits, etc. according to the present invention as described above, when the container is made of a container body made of foamed synthetic resin and a lid body, when the lid is closed at a proper place, a vent is provided that communicates with the inside and outside for a required length. Since it uses a cold storage container in which a communication part is formed,
It is possible to store cold objects such as vegetables and fruits inside and perform pre-cooling operations and return operations to atmospheric pressure with the lid closed, improving the efficiency of pre-cooling operations in the vacuum pre-cooling method using a vacuum chamber. be able to. In addition, after the pressure difference between the inside and outside of the container disappears after pre-cooling, the container is filled with air and the air inside the container has a high density due to its low temperature.
Because the temperature of the outside air is high, the density of the air is low and it becomes difficult to flow.In addition, the viscous resistance of the ventilation passage and the frictional resistance of the membrane prevent the free flow of air inside and outside the container. It can be virtually shut off, and the temperature rise of the cold object can be kept to a minimum.Furthermore, since new oxygen is not supplied to the cold object, there is no temperature rise due to respiration, and for this reason, the pre-cooled cold object can be The freshness of the food can be maintained for a long time.Also,
Since there is no need to seal the opening of the ventilation communication section facing outside the container after pre-cooling, the work time can be omitted. In addition, surface tension prevents moisture within the container from leaking out of the container, thereby preventing wetting the area around the container. Moreover, when closing a highly airtight container, the ventilation passage becomes a mere ventilation path, and it also allows pressurized air to escape when the lid is closed, making it suitable for automatic lid closing using a machine. be.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view showing a first embodiment of a cold storage container used for storing vegetables, fruits, etc. according to the present invention, and FIG.
FIG. 3 is a perspective view showing a part of the second embodiment of the cold storage container; FIG. 4 is a perspective view of a part of the third example of the cold storage container; FIG. Figures (A), (B), Figure 6 (
(a) and (b) are explanatory diagrams showing the cold storage container according to the present invention used in comparative experiments, Figure 7 is a perspective view showing a conventional cold storage container, and Figure 3 is a comparison of cold storage performance after precooling by vacuum precooling method. Graph showing experimental data, FIG. 9 is a perspective view showing another aspect of the cold storage container, FIG. 10 is a perspective view showing the main parts thereof, FIG. Figure 13 is a vertical cross-sectional view showing the main parts of still another embodiment of the cold storage container, Figure 14 is a perspective view of a cardboard box used in the comparative experiment, and Figure 15 is a cardboard box made of foamed synthetic resin used in the comparative experiment. 16(a) and 16(b) are perspective views of a cold insulating container;
Figure 0 is an explanatory diagram showing the main parts of the cold insulating container according to the present invention, which is also used in the comparative experiment, and Figures 18 (a), (b), and (c) are plan views showing other aspects of the cold insulating container used in the comparative experiment, respectively. .

A front view, a vertical cross-sectional view of main parts, and FIG. 19 are graphs showing comparative experimental data on cold storage performance after precooling by vacuum precooling method.

■=Container body, -2: Lid, 3: Side wall, 4: Convex strip, 5: Concave strip, 6: Ventilation communication part, Anni concave groove,
8: Inner side opening, 9: Outer side opening, lO
: Gap, ll: Interior convex portion, 12: Bottom plate, 13: Stepped portion, I4: Mounting port, 15: Pipe material 16: Opening.

Figure 2 7〈～( Figure 1 Noid, ! /I\ Figure 4 Figure 3 Figure 6 (stomach) Figure 5 Hit 11 Figure 8 °to.

9:00 1 area 1 harvest ■ Frequency O vl Network Figure 7 No I\( Figure 10 Figure 9 Figure 13 Figure 12111 Figure 11 Figure 16 (A) 1 h'' 111 Figure 14 , /\, 152, 2/'＼,,, Fig. 18 (a) Heavy quality) 2nd person l No. 17
Ill

Claims (1)

[Claims] 1) A cold storage container consisting of a container body and a lid made of foamed synthetic resin contains cold objects such as vegetables and fruits, and is stored in a vacuum chamber with the lid closed. By reducing the pressure inside the vacuum chamber, when the lid of the required length provided at the appropriate location of the container is closed, the air inside the container is caused to flow through the ventilation communication section that communicates with the inside and outside. The object is pre-cooled by forced evacuation against viscous resistance and membrane friction resistance, and then the inside of the vacuum chamber is restored to atmospheric pressure, and after being removed from the vacuum chamber, the object is vented. Vegetables that substantially block the inflow of outside air into the container due to the viscous resistance and membrane friction resistance of the communication part,
How to store fruits, etc. 2) The cross-sectional area and/or length of the ventilation communication section is formed to such an extent that free air flow is substantially blocked by viscous resistance and membrane friction resistance when there is no pressure difference between the inside and outside of the container. A method for storing vegetables, fruits, etc. according to claim 1. 3) A container consisting of a container body and a lid made of foamed synthetic resin, where one of the joints between the container body and the lid has one fitting means, and the other one has one fitting means. One and/or the other of the fitting means is provided, and one and/or the other of the fitting means is provided so that when the container is closed, a ventilation communication portion communicating between the inside and outside is formed between one of the fitting means and the other. A recessed groove of a required length extending in the longitudinal direction of this fitting means is provided on the joint surface side of the fitting means, and furthermore, one end of this recessed groove has an inner surface opening facing into the container and the other end an outer surface facing outside the container. A cold storage container with side openings. 4) The cold storage container according to claim 3, wherein the groove is provided with a corner of the container in between. 5) A patent in which the cross-sectional area and/or length of the groove is formed to such an extent that when there is no pressure difference between the inside and outside of the container, free flow of air is substantially blocked due to viscous resistance and film frictional resistance. A cold insulating container according to claim 3 or 4.