JPH09308443A - Preservation of rice - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for storing and preserving rice at a low cost for a long period without deteriorating the taste of the rice over a long period. SOLUTION: This method for preserving rice comprises charging the rice into a bag-like inner container 1 comprising a polyethylene sheet and having an opened hole at the upper part, receiving the inner container in an outer container 4 comprising a polypropylene sheet to form a double container 6, closing the hole of the inner container, adjusting the atmosphere in the inner container to a prescribed humidity through a valve connected to the inner container, closing the valve and subsequently storing the double container in an ice storage room at a temperature of 0-5 deg.C.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention can store brown rice and milled rice for a long period of time in a warehouse or rice store of a rice wholesaler without deteriorating their taste, and at the same time, meet the needs of energy saving and low running cost from a small amount to a large amount. It relates to a method of storing rice that can be stored properly.

[0002]

2. Description of the Related Art Conventionally, it has been possible to store only vegetables in an ice room and to store rice in a paper bag or hemp bag system on a trial basis. However, when the humidity in the ice room storage is 90 to 98%, the humidity is high. The brown rice increased in water content and promoted the growth of mold. For this reason, old rice was not liked by consumers because it had a bad taste and was not clean.

Conventional long-term storage has been carried out at a low temperature of about 15 ° C., but at this temperature, there is no insecticidal effect against harmful insects such as elephant worms, and at normal temperature, the harmful insects come to life and the taste deteriorates. It had become old rice.

[0004]

Therefore, if the storage at ultra-low temperature of 0 to 5 ° C. or the storage by gas filling is performed, the generation of harmful insects can be prevented and the taste of fresh rice can be maintained without spoiling the taste. However, it is necessary to use electric power for such storage, and there are many problems in terms of energy saving, environmental protection, and running cost.

The present invention has been made in order to solve such problems, and it is possible to maintain rice having the same excellent taste as fresh rice at any time without impairing the taste of rice for a long period of time. It is an object of the present invention to provide a method of storing rice at low cost for a long period of time.

[0006]

In order to achieve such an object, the present invention uses a polyethylene sheet having holes for taking rice in and out, instead of a paper bag and a hemp bag which have been conventionally used. Use, seal the hole with heat seal, waterproof fastener or clip,
One valve was provided on each of the left and right sides of the hole to enable dehumidification and humidification, and at the same time, gas was sealed to seal the gas. When rice is put in the hole and the quantity is determined, put a hygrometer in the hole to seal the hole, and dehumidify and humidify from one valve to maintain the optimum humidity. When this work is completed,
Lift the double container and place it directly on the floor in the ice room, or put it in a steel container and stack it for storage. It is also possible to attach an outer container suitable for the size of the steel container to the inside of the steel container and put the inner container in the outer container to accommodate rice in the inner container. The "rice" in the present invention includes both brown rice and polished rice.

[0007]

Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 shows an internal container 1 used in the storage method of the present invention. The inner container 1 is a bag-shaped container formed of a polyethylene sheet, and has a hole 2 at the top. This internal container 1 has, for example, a length of 720 to 1
000mm, width 580-800mm, height 850-12
It has a size of 00 mm. Two valves 3 for adjusting the humidity inside the container and for enclosing gas are connected to the side of the hole 2.

As shown in FIG. 2, the outer container 4 has substantially the same volume as the inner container 1 or a slightly larger volume.
It is made of polypropylene sheet. External container 4
A handle 5 for carrying is formed on the upper part of the.
By housing the inner container 1 in the outer container 4, a double container 6 as shown in FIG. 3 is constructed.

The valve 3 connected to the inner container 1 is shown enlarged in FIG. Insert the cylindrical member 7 from the inside of the inner container 1 into the opening formed in the polyethylene sheet of the inner container 1,
One end of a polyethylene pipe 8 is fitted to the outer peripheral portion of the cylindrical member 7 outside the inner container 1, and these are joined with an adhesive. Further, the outer peripheral portion of the polyethylene pipe 8 is tightened with the stopper joint 9 shown in FIG.
And the cylindrical member 7 are fixed. On the other hand, the other end of the polyethylene pipe 8 has a cylindrical female stopper 1 as shown in FIG.
0 is fitted and joined with an adhesive, and the other end of the polyethylene pipe 8 and the female stopper 10 are fixed by tightening the outer peripheral portion of the polyethylene pipe 8 with another stopper joint 9. A female screw is formed on the inner peripheral portion of the front end of the female stopper 10, and a male screw of a male stopper 11 as shown in FIG. 6 is screwed therein.

The male stopper 11 is provided with a packing P. The male stopper 11 is screwed onto the female stopper 10 to seal the valve 3, and the male stopper 11 is removed from the female stopper 10 to allow the valve 3 to be closed. be opened. The polyethylene pipe 8 has a diameter of 15 to 25 mm, and its length is, for example, 460 to 600 depending on the size of the inner container 1.
It is an appropriate value of about mm.

Rice is stored in such a double container 6. That is, the inner container 1 is housed in the outer container 4 to form a double container 6 as shown in FIG. 3, and rice is put into the inner container 1 through the hole 2. When a fixed amount of rice is stored, a hygrometer is inserted therein and the hole 2 is sealed.

The sealing of the hole 2 is necessary for long-term storage.
It is advisable to heat and weld the polyethylene sheet forming the peripheral portion of the hole 2 by a heat seal method with a commercially available heat sealer. In the case of long-term or medium-term storage, a waterproof fastener 12 as shown in FIG. 8 can be attached to the hole 2 in advance and sealed with the waterproof fastener 12. As shown in FIG. 9, the waterproof fastener 12 has a special rubber 15 located under the fastener portion 14 attached to the polyethylene sheet 13 to prevent the permeation and entry of moisture inside and outside the inner container 1. Has become. Alternatively, a clip stopper 16 as shown in FIG. 10 can be attached to the hole 2. A clip core 18 is attached to the edge of one polyethylene sheet 17, and a clip cap 20 is attached to the edge of the other polyethylene sheet 19. By fitting the clip cap 20 on the outer peripheral portion of the clip core 18, as shown in FIG. 11, both polyethylene sheets 17 and 19 are joined. This clip stop 1
Also in 6, the permeation and intrusion of moisture inside and outside the inner container 1 are prevented. By using the waterproof fastener 12 and the clip stopper 16, the hole 2 can be easily opened and closed.

After the hole 2 of the inner container 1 is sealed as described above, the humidity inside the inner container 1 is adjusted to the optimum humidity by opening and closing the pair of valves 3 connected to the inner container 1. Furthermore, if necessary, nitrogen gas, carbon dioxide gas, or a mixed gas thereof and a deoxidizing material are sealed from the valve 3 into the inner container 1. By enclosing such a gas, it is possible to effectively prevent the generation of harmful insects such as nerdy worms and unagainshi insects attached to brown rice and the like, bacteria, molds and the like. At this time, a pair of valves 3 can be effectively used, for example, one valve 3 can be used for humidity adjustment, and the other valve 3 can be used to fill the gas. Further, it is preferable that the gas is enclosed so that the polyethylene sheet does not swell and the inside of the inner container 1 is kept at normal pressure.

When the humidity adjustment and the gas charging are completed in this way, the valve 3 is closed and the temperature of the double container 6 is kept at 0 to 5 ° C.
Carry it into the ice room store and start ultra-low temperature storage. Thereby, the humidity can be maintained as it is.

The double container 6 can be placed on the floor in an ice storage room, but when the double container 6 is stacked and stored on the floor, the double container 6 is a steel container 21 as shown in FIG.
It is housed inside and the steel containers 21 are piled up. This ensures that the whole of the stacked double containers 6 reaches a low temperature, and when the double containers 6 are pushed, the double containers 6 are damaged or the gas enclosed inside leaks to the outside. This is to prevent The steel container 21 has a length of 1700 mm and a width of 1100 m, for example.
m and height 1400 mm.

The inside of the steel container 21 is shown in FIG.
3, an outer container 22 made of a polypropylene sheet that fits the size of the steel container 21 is attached, and an inner container 23 made of a polyethylene sheet as shown in FIG.
It is also possible to store rice in the inner container 23. Also in this case, the humidity adjustment by the valve and the gas filling are similarly performed.

Even if the double container is taken out of the ice room from the state of ultra-low temperature storage, the rice contained therein will not condense and the humidity will maintain the optimum humidity set at the beginning even if the temperature becomes the same as the outside. Does not spoil the taste of rice. However, since the taste decreases as the temperature rises, it is desirable to refill the rice as soon as possible after carrying it out and store it again at ultra-low temperature.

In this invention, since the inner container 1 or 23 made of a polyethylene sheet is used, the permeability of gas such as water vapor is small, and rice can be stored for a long period of time without spoiling the taste. . In addition, since the ice storage is performed without using the electric power, it is possible to save the energy at a low cost while being excellent in energy saving.

[Brief description of drawings]

FIG. 1 shows an internal container used in a method for storing rice according to an embodiment of the present invention, (A) is a plan view,
(B) is a perspective view.

FIG. 2 shows an external container used in the method for storing rice according to the embodiment, (A) is a plan view and (B) is a perspective view.

FIG. 3 is a perspective view showing a double container in which an inner container is housed in an outer container.

FIG. 4 is a cross-sectional view showing a polyethylene pipe and a valve connected to an inner container.

5A and 5B show a female stopper used for a valve, FIG. 5A is a sectional view, and FIG. 5B is a plan view.

FIG. 6 shows a male stopper used for a valve, (A) is a cross-sectional view, and (B) is a plan view.

FIG. 7 is a plan view showing a stopper joint.

FIG. 8 is a plan view showing a waterproof fastener.

FIG. 9 is a cross-sectional view showing a state in which the waterproof fastener is closed.

FIG. 10 is a perspective view showing a clip stopper.

FIG. 11 is a cross-sectional view showing a clip stopper.

FIG. 12 is a perspective view showing a steel container used in a storage method according to another embodiment.

FIG. 13 is a perspective view showing an external container used in a storage method according to another embodiment.

14A and 14B show an internal container used in a storage method according to another embodiment, FIG. 14A being a plan view and FIG. 14B being a perspective view.

[Explanation of symbols] 1,23 Inner container 2 holes 3 Valve 4,22 Outer container 5 Handle 6 Double container 7 Cylindrical member 8 Polyethylene pipe 9 Stopper joint 10 Female stopper 11 Male stopper 12 Waterproof fastener 13,17,19 Polyethylene sheet 18 clip core 20 clip cap 21 steel container P packing

Claims (6)

[Claims] 1. An inner container of a double container comprising a bag-shaped inner container made of a polyethylene sheet and having a hole opened at the top, and an outer container made of a polypropylene sheet for accommodating the inner container, through the hole. Put rice, seal the hole in the inner container, dehumidify and humidify the inside of the inner container with a valve connected to the inner container to a predetermined humidity, and then close the valve. A method for preserving rice, characterized by storing it in a storage. 2. The method according to claim 1, wherein nitrogen gas, carbon dioxide gas, or a mixed gas thereof and a deoxidizing material are enclosed in the inner container through a valve connected to the inner container. 3. The method according to claim 1, wherein the hole of the inner container is sealed by a heat sealing method, a waterproof fastener, or a clip method. 4. The method according to claim 1, wherein a humidity meter is placed in the inner container to measure the humidity. 5. The method according to claim 1, wherein the double container is housed inside a steel container, and the steel container is stored side by side and stacked in an ice compartment storage. 6. An outer container suitable for the size of a steel container is attached to the inside of the steel container, and the inner container is placed in the outer container to accommodate rice in the inner container. 5. The method according to any one of 4 to 4.