JP4726072B2 - Canned rice grains - Google Patents

Description

  The present invention relates to a method for canning rice grains such as polished white rice (including non-washed rice washed white rice) and brown rice, and in particular, a thin can body such as a seamless can body for a two-piece can. The present invention relates to a method for canning rice cereal for filling and sealing rice cereal with respect to the provided can body.

  A seamless can body (the body of a two-piece can) with a thin body portion of 0.15 mm or less, which is integrally formed by drawing and ironing from an aluminum alloy or steel metal plate, and is a can of beverages It has been widely used in the field in the past, but when manufacturing canned goods with a can body having such a thin body part, in order to reinforce the can body that has a thin wall thickness and is easy to dent, It is necessary to increase the internal pressure of the can, so it is not necessary for sparkling beverages such as beer and carbonated beverages, but for non-foamable beverages, liquid nitrogen is added to the container headspace when filling the contents. Conventionally, it has been generally carried out.

Meanwhile, rice, wheat, when the storage of grains such as beans, but the CO ₂ gas storage method has been conventionally applied as a way to inactive biological activity, save such CO ₂ gas by law, in particular, white rice, as optimal for rice such as brown rice, the patent documents described below, when the storage of cereals by pressure-resistant container such as a drum, the vessel was CO ₂ gas atmosphere in filling-sealing cereals, that allowed to absorb CO ₂ gas beforehand cereals, with less CO ₂ gas absorption cereals after sealing, to reduce the pressure change in the container, that Each of the technologies is disclosed.

In addition, in rice cereals such as white rice and brown rice, the fat of raw rice and the fat contained in the attached rice cake are oxidized during storage, but the taste of cooked rice deteriorates due to the formation of fatty acids. According to the CO ₂ gas storage method disclosed in the patent document, the oxidation of raw rice fat is prevented by the CO ₂ gas, so that the taste of cooked rice does not deteriorate.
Japanese Examined Patent Publication No. 61-20255 Japanese Patent Publication No. 63-2565

However, when stored rice grains by CO ₂ gas storage method, the conventional CO ₂ gas storage method as described above, the use of the pressure-resistant container such as a drum as a storage container, such pressure vessel Since it is cumbersome to manufacture and heavy, it can be manufactured in large quantities in a short time and can be manufactured in a lightweight can body, that is, the bottom and body are integrally formed by drawing and ironing from an aluminum alloy or steel metal plate. The use of a seamless can body having a thin body of 15 mm or less as a storage container for rice grains has been studied.

When manufacturing canned rice grains such as polished white rice and brown rice using a can body having a thin body of 0.15 mm or less, air in the can is filled and sealed in the process of filling and sealing. It is necessary to add liquid nitrogen, dry ice, or the like to the head space in the can in order to replace it with a CO ₂ gas atmosphere and to increase the internal pressure in the canned container. However, if very low temperature liquid nitrogen or dry ice or the like is added in a state filled with raw rice such as polished white rice or brown rice, the raw rice that has come into contact with liquid nitrogen or dry ice may be broken at low temperatures. .

  The present invention is intended to solve the above problems, specifically, when producing canned rice cereals by a can whose body has been thinned by drawing, ironing, etc. An object of the present invention is to make it possible to maintain a can internal pressure of a can filled with and sealed with rice cereals (raw rice) without adding liquid nitrogen or dry ice.

In order to solve the above-described problems, the present invention preliminarily stores CO in a state where the air in the can is replaced with CO ² gas with respect to a can body whose body is thinned by drawing and ironing processing. ^{As a} method for canning rice cereals in which rice gas that has absorbed ² gas is filled with CO ² gas and then sealed,
First, the relative tank for storing the internal air is replaced with CO ² gas, blowing of CO ² gas from the bottom side, and, by introducing the rice from its upper, to seal the tank,
In the stirring and deaeration process, in a state where the tank is filled with CO ² gas and pressurized, the tank is rotated a predetermined number of times and then depressurized to the atmospheric pressure. After replacing the air between the rice grains with CO ² gas,
In the gas absorption process, the tank that has been depressurized in the previous process is filled with CO ² gas and pressurized, and the tank is rotated, and the internal pressure of the tank is checked at regular intervals to replenish the CO ² gas. In the state where the internal pressure of the tank is kept constant, the tank is rotated for a predetermined time so that the rice in the tank absorbs CO ² gas, and then the internal pressure of the tank is reduced to atmospheric pressure.
In filling and sealing process, with a CO ² gas atmosphere for the can body in which the inside of the vessel was replaced with CO ² gas, while flowing CO ² gas in the can, together with the CO ² gas flows from the filling nozzle of the tank bottom After filling the can with rice, the can body was covered with a can lid and sealed by double wrapping , so that the internal pressure of the can increased to atmospheric pressure plus 0.02 MPa or more even after 4 days of canning It is characterized by.

According to the method for canning rice cereals of the present invention as described above, the rice cereal in which the body has been thinned by drawing, ironing processing, etc., and the CO ² gas is absorbed in advance in the can When the can is filled and sealed with CO ² gas replaced with CO ² gas to make a can, the can can be filled without adding liquid nitrogen or dry ice to the head space in the can. Even after 4 days of production, the can internal pressure of the can can be maintained at atmospheric pressure plus 0.02 MPa or more.

  As a result, without using a pressure vessel such as a drum can, the container cost can be reduced and the rice milled by using a container made of a can whose thickness has been reduced by drawing and ironing processing etc. Rice grains such as white rice and brown rice (raw rice) can be canned in good condition without being broken by low temperature such as liquid nitrogen or dry ice, and the fat of raw rice can be oxidized Can be stored well.

When canned rice cereals are produced with cans whose body has been thinned by drawing and ironing, etc., rice cereals (raw rice) are filled and sealed without adding liquid nitrogen, dry ice, etc. As specifically shown in the examples below as the best mode, the purpose of enabling the can internal pressure to be maintained above a certain level,
First, the relative tank for storing the internal air is replaced with CO ² gas, blowing of CO ² gas from the bottom side, and, by introducing the rice from its upper, to seal the tank,
In the stirring and deaeration process, in a state where the tank is filled with CO ² gas and pressurized, the tank is rotated a predetermined number of times and then depressurized to the atmospheric pressure. After replacing the air between the rice grains with CO ² gas,
In the gas absorption process, the tank that has been depressurized in the previous process is filled with CO ² gas and pressurized, and the tank is rotated, and the internal pressure of the tank is checked at regular intervals to replenish the CO ² gas. In the state where the internal pressure of the tank is kept constant, the tank is rotated for a predetermined time so that the rice in the tank absorbs CO ² gas, and then the internal pressure of the tank is reduced to atmospheric pressure.
In filling and sealing process, with a CO ² gas atmosphere for the can body in which the inside of the vessel was replaced with CO ² gas, while flowing CO ² gas in the can, together with the CO ² gas flows from the filling nozzle of the tank bottom After filling the can with rice, the can body is covered with a can lid and sealed by double wrapping so that the can has an internal pressure of atmospheric pressure plus 0.02 MPa or more even after 4 days of canning , That's what happened.

  Regarding one embodiment of the method for canning rice grains of the present invention, first, an example of a specific apparatus for carrying out the method of this embodiment will be described. As shown in FIGS. 1 and 2, polished white rice ( In the apparatus 1 for canning raw rice such as unpolished rice washed with white rice) or brown rice, a pressurizable tank 3 for temporarily storing the rice is provided at the upper end of the machine frame. It is rotatably mounted so as to surround the horizontal shaft 5 and is installed so as to be rotationally driven by a gear transmission motor 4 (output 0.1 kw / h) disposed on the side of the horizontal shaft 5. Yes.

In the opposite side of the motor 4 side, CO ₂ on the side of the horizontal shaft 5, the check valve with a pipe 6 for supplying the CO ₂ gas into the tank 3 are piping, fed from a pipe 6 The gas is introduced into the tank 3 through the internal space of the tubular horizontal shaft 5.

  A lid 7 that can seal the tank 3 in an airtight state is detachably provided on the ceiling side of the tank 3, and a pressure release valve 8 that reduces the pressure in the tank 3 to atmospheric pressure is provided in the lid 7. And a safety valve 9 that is released when the pressure in the storage tank 3 reaches 1 MPa.

A hopper portion 10 is provided on the bottom side of the tank 3, and an open / close valve 11 that is manually opened and closed by a handle is provided at the lower end of the hopper portion 10. A bifurcated channel is formed by a main channel extending downward and a horizontal channel extending laterally. A check valve 12 that is opened only when CO ₂ gas is introduced is provided in the lateral flow path of the on-off valve 11, and a filling nozzle 13 is provided at the lower end of the main flow path of the on-off valve 11 with appropriate means such as a crimper. It is attached so that it can be detached.

  The tip of the filling nozzle 13 enters the inside of the transparent box 14, and the box 14 made of a synthetic resin plate such as an acrylic plate is radially cut into a flexible plate material on one side wall thereof. As a result, an openable / closable hole 15 is formed for inserting a hand into the box 14, and the front wall of the box 14 is a door that can be opened and closed by a hinge.

In addition, the openable / closable hole 15 of the box 14 may be made to improve airtightness as a glove port to which a rubber glove is attached instead. When a glove port is adopted, an appropriate place on the wall of the box 14 is provided. It is necessary to provide a small hole for discharging air or CO ₂ gas.

Inside the box 14, a measuring device 16 for measuring the weight of the rice filled in the can 2 is installed, and on the side wall opposite to the openable / closable hole 15 of the box 14, the box 14 A gas supply pipe 17 for introducing CO ₂ gas is installed through a hole formed in the wall. The distal end of the gas supply pipe 17 is made of a material such as nylon, which is deformable and flexible and can be deformed.

  The method for canning rice cereals of the present embodiment, which is performed using the apparatus 1 as described above, will be described in detail below.

First, as shown in FIG. 3, the lid 7 is removed from the tank 3 of the apparatus 1, a separate hopper 18 is attached, the filling nozzle 13 is removed, and a tube 19 whose tip is covered with a screen is attached. 19, CO ₂ gas is allowed to flow into the tank 3 in which the on-off valve 11 is opened at a flow rate of about 10 ml / min for about 10 minutes, and the air in the tank 3 is replaced with CO ₂ gas.

When the air in the tank 3 is replaced by CO ₂ gas, while continuing the supply of CO ₂ gas through the tube 19, since the charged from the hopper 18 Rice (raw rice white rice and brown rice) in tank 3 As shown in FIG. 4, the lid 7 is attached and the on-off valve 11 is closed to stop the supply of CO ₂ gas (remove the tube 19), thereby completing the rice charging process.

Next, CO ² gas is supplied into the tank 3 from the pipe 6 through the inside of the horizontal shaft 5, and the tank 3 is driven by driving the motor 4 while the internal pressure of the tank 3 is increased to atmospheric pressure plus 0.04 MPa. Rotate (2 or 3 rotations) to dilute the air between the rice grains with CO ² gas, and then open the pressure release valve 8 to depressurize the inside of the tank 3 to atmospheric pressure. (Air diluted with CO ² gas) is discharged to the outside.

In this way, the tank 3 is pressurized with CO ₂ gas, stirred, and then stirred and degassed so that air diluted with CO ₂ gas is discharged out of the tank 3 1 to 3 times. The air is completely exhausted from the tank 3 and replaced with CO ₂ gas, thereby completing the stirring deaeration process.

Next, after filling the tank 3 with CO ² gas supplied from the pipe 6 and increasing the internal pressure of the tank 3 to atmospheric pressure plus 0.1 MPa, the supply of CO ² gas into the tank 3 is performed. By stopping and driving the motor 4, the internal pressure of the tank 3 is confirmed about every 30 minutes while rotating the tank 3 at a rotational speed of about 1.5 times / minute. When the internal pressure of the tank 3 is reduced to atmospheric pressure plus 0.1 MPa or less, CO ² gas is replenished from the pipe 6 so that the internal pressure of the tank 3 is always maintained at atmospheric pressure plus 0.1 MPa. Rotate the tank 3 for about 3 hours to make the rice fully absorb CO ² gas.

In this way, when the tank 3 is rotated while maintaining the internal pressure of the tank 3 constantly at atmospheric pressure plus 0.1 MPa for about 3 hours, the rotation of the tank 3 is stopped and the pressure release valve 8 is opened to open the tank 3. The gas absorption step of allowing the rice to absorb CO ² gas is completed by reducing the internal pressure of the gas to atmospheric pressure. And as shown in FIG. 5, the filling nozzle 13 is attached to the lower end of the on-off valve 11 (main flow path) of the tank 3 to introduce CO ² gas into the check valve 12 of the on-off valve 11 (lateral flow path). After the gas supply pipe 20 is attached, the process proceeds to the rice filling / sealing process.

In the rice filling / sealing process, a can body in which the bottom portion and the body portion are integrally formed by drawing and ironing and the body portion is thinned (0.15 mm or less) is placed in the box 14 of the apparatus (box 14). The door is closed and the door is closed), and then into the box 14 through the gas supply pipe 17 and the gas supply pipe 20 through the filling nozzle 13 at a flow rate of about 5 ml / min. CO ₂ gas is introduced.

Then, when the inside of the box 14 is filled with CO ₂ gas, the can body 2 is lifted as shown in FIG. the insertion into the can body 2, by holding the state for about 10 seconds, the CO ₂ gas supplied through the filling nozzle 13 from the gas supply pipe 20 is replaced with a reliable CO ₂ gas inside the can body 2 .

When the CO ₂ gas replacement in the can body 2 is thus completed, the can body 2 is placed on the measuring instrument 16 and the tip of the gas supply pipe 17 is placed inside the can body 2 as shown in FIG. In the state where the gas is supplied, the on-off valve 11 (main flow path) is opened while supplying CO ₂ gas from each of the gas supply pipe 17 and the gas supply pipe 20 at a flow rate of about 5 m1 / min. Is filled into the can body 2 and when the measuring instrument 16 shows a predetermined weight (for example, when a can body having a content of 590 ml is used, about 450 g (about 3 go) is filled) By closing the on-off valve 11 (main flow path), the rice filling process is completed.

Then, when a predetermined amount of rice is filled in the can 2, as shown in FIG. 8, while supplying CO ₂ gas from each of the gas supply pipe 17 and the gas supply pipe 20 at a flow rate of about 5 m1 / min, A full-opening can lid 21 for sealing the can body 2 is manually put into the box 14 from the openable / closable hole 15 and placed on the can body 2, and after about 10 seconds, the can body 2 The gas supply pipe 17 is pulled out from the inside, and the can lid 21 is completely covered with the can body 2. Then, the can body 2 with the can lid 21 completely covered is opened by opening the door (front wall) of the box 14. The can sealing process is completed by taking out from the box 14 and immediately immediately double-tightening the can lid 21 onto the can body 2 with a tightening machine.

According to the method for canning rice cereals of the present embodiment as described above, immediately after production of canned food, canned food having a can internal pressure of atmospheric pressure plus 0.03 MPa or more can be produced. Even after the day, the can has an internal pressure of atmospheric pressure plus 0.02 MPa or more. Even after that, the CO ² gas is hardly absorbed by the rice, and the internal pressure in the can replaced with the CO ² gas is kept constant. Because it can be maintained, even when using a can body in which the bottom part and the body part are integrally formed by drawing and ironing and the body part is thinned (0.15 mm or less), The can body will not be recessed during transportation or sales.

In addition, when filling rice (raw rice), liquid nitrogen, dry ice, etc. are not added, so that the rice does not break at low temperatures due to liquid nitrogen, dry ice, etc. _{Since the} gas is substituted with _two gases and the CO ₂ gas is sufficiently absorbed by the rice, the rice can be stored in a good state without oxidizing the fat of the rice.

  As mentioned above, although one Example of the canning method of the rice cereal of this invention was described, this invention is not limited only to the above specific Examples, For example, between a tank and a filling nozzle. The opening / closing of the opening / closing valve is not limited to manual opening / closing, and may be controlled by electrical control. Handling of the can body in the box is not limited to being held and moved by hand, but mechanically. The can body may be moved, and the can lid for sealing the can body is not limited to a full-open can lid, but may be other can lids, etc. Needless to say.

The front view which shows an example of the apparatus for enforcing the method of this invention. The side view of the apparatus shown in FIG. The apparatus shown in FIG. 1, a front view showing a state of the device in the step of introducing the rice into the tank while replacing the inside of the tank to the CO ₂ gas. The apparatus shown in FIG. 1, the stirring deaeration step of stirring the tank to discharge the air between the grains of rice, and a front view showing a state of the apparatus in the gas absorption step for absorbing the CO ₂ gas in the US. The front view which shows the state of the apparatus before transfering to a filling and sealing process after a gas absorption process is completed about the apparatus shown in FIG. The apparatus shown in FIG. 1, partial cross-sectional front view showing a state of replacing the can body in the CO ₂ gas before filling the rice. The partial cross section front view which shows the state which has filled the rice about the apparatus shown in FIG. The partial cross-sectional front view which shows the state which mounted the can lid | cover on the can body about the apparatus shown in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Apparatus 2 Can body 3 Tank 4 Motor 5 Horizontal axis 6 Pipe 7 Lid body 8 Pressure release valve 9 Safety valve 10 Hopper part 11 Opening valve 12 Check valve 13 Filling nozzle 14 Box 15 Opening and closing hole 16 Metering device 17 Gas supply pipe 18 Hopper 19 Tube 20 Gas supply pipe 21 Can lid

Claims (1)

Filling relative drawing and ironing can body barrel portion is thinned by such a state that the air in the reactor was replaced with CO ² gas, rice cereal imbibed with previously CO ² gas, the CO ² gas As a method of canning rice cereals that are then sealed,
First, the relative tank for storing the internal air is replaced with CO ² gas, blowing of CO ² gas from the bottom side, and, by introducing the rice from its upper, to seal the tank,
In the stirring and deaeration process, in a state where the tank is filled with CO ² gas and pressurized, the tank is rotated a predetermined number of times and then depressurized to the atmospheric pressure. After replacing the air between the rice grains with CO ² gas,
In the gas absorption process, the tank that has been depressurized in the previous process is filled with CO ² gas and pressurized, and the tank is rotated, and the internal pressure of the tank is checked at regular intervals to replenish the CO ² gas. In the state where the internal pressure of the tank is kept constant, the tank is rotated for a predetermined time so that the rice in the tank absorbs CO ² gas, and then the internal pressure of the tank is reduced to atmospheric pressure.
In filling and sealing process, with a CO ² gas atmosphere for the can body in which the inside of the vessel was replaced with CO ² gas, while flowing CO ² gas in the can, together with the CO ² gas flows from the filling nozzle of the tank bottom After filling the can with rice, the can body was covered with a can lid and sealed by double wrapping , so that the internal pressure of the can increased to atmospheric pressure plus 0.02 MPa or more even after 4 days of canning A method for canning rice cereals.

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