JP3461814B2 - White rice quality judgment method - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for determining the quality of white rice, and more particularly to estimating the boiling rate of cooked rice in white rice.

[0002]

2. Description of the Related Art The hardness of cooked rice varies depending on the consumer, and cooked rice with a solid grain (hard cooked rice) or soft cooked rice is preferred. One of the factors cooking the rice may turn soft, in the immersion step of performing at the time of cooking, but before water immersion is not cause cracks, when submergence rice causing barrel cracking (water immersion split grains) There is existence. When rice is cooked, the water-immersed split grains will collapse and become sticky and soft cooked rice. Therefore, conventionally, there has been known a quality evaluation method for polished rice, in which the mixing rate of the water-immersed split grains contained in the polished rice is calculated to estimate the boiling rate of cooked rice. In this evaluation method, 100 grains (about 2 grams) of the polished rice sample were put in a water-immersed dish, and after about 20 minutes, the split barrel grains (immersed split grain) were visually counted to obtain the polished rice sample. determine the mixing ratio of water immersion split grains contained in 100 grains of, is that to estimate the percentage collapse boiled rice by the mixing rate.

[0003]

However, there was not a sufficient correlation between the mixing ratio of the water-dipping split grains and the boiling collapse ratio of cooked rice. As shown in the distribution graph of FIG. 4, this correlation shows that there is a difference in the boiling rate of cooked rice even when the mixing rate of the water-immersed split grains is at the same level. Therefore, the accuracy of estimating the collapse rate of cooked rice was not sufficient. In view of this problem, the present invention provides a method for determining quality of white rice that improves the accuracy of estimating the collapse rate of cooked rice.

[0004]

In order to solve the above-mentioned problems, the present invention immerses a predetermined amount of sample white rice for a predetermined time,
The number of barrel split grains (divided in water) produced by the immersion and the number of barrel split grains (preliminary grain in water) produced by applying a load to the sample white rice excluding the water split grains Based on
This is a method of judging the quality of white rice by estimating the rate of boiled rice in white rice. More specifically, based on the total number of the water-divided grains and the water-divided preliminary grains, the mixing ratio contained in the sample white rice of the total number is obtained, and the cooked rice in white rice is calculated based on the mixing ratio. Estimate the collapse rate of.

[0005] white rice samples after immersion water, in addition to the trunk split grains caused by water immersion (water Hitawari grains), but not a body cracks after immersion water, the body split grains by applying a load grain ( It has been found that when the rice is cooked like the above-mentioned water-immersion barrel split granules, the granules are boiled down. The present invention, in addition to the number of water- divided split particles (mixing rate),
By considering the number (mixing rate) of the preliminary immersion grains, it is possible to improve the accuracy of estimating the collapse of cooked rice. Further, in order to prevent the generation of water-dipping split grains and water-dipping preliminary grains, it is possible to change the rice-polishing conditions of the rice-polishing machine, etc., based on the estimation result of the boiling rate of cooked rice.

The load applied to the sample white rice is
It said sample rice may Ru is changed according to water temperature to immerse water. The sample white rice has a higher water absorption amount and a lower hardness as the temperature of water in which the sample white rice is soaked is higher. Therefore, the higher the immersion water temperature is, the lower the load is, so that the load conditions applied to the sample white rice can be the same. Therefore, the boiling rate of cooked rice can be accurately estimated even if the immersion water temperature is different.

Further, a load bar having a core rod that abuts against the sample white rice to apply a load, a load detection means connected to the core rod, and an informing means for notifying a user of the detected load value is used to apply the load to the sample white rice. When a predetermined load is applied, the work of applying the load is easy. Further, if the load meter is configured in a pen shape, the work of applying a load becomes easier.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION A preferred embodiment of the method for judging quality of polished rice according to the present invention will be described. First, rice (hereinafter, referred to as "sample particle") that is not barrel cracks visually approximately 2 grams (about 100 grains), placed in a sample pan filled with water is soaked for 20 minutes. Then, from the sample grains that have been immersed for 20 minutes, the number of grains that have undergone barrel cracking is visually counted to obtain the number of water-immersion split grains. After that, the sample grains excluding the water-immersed split grains are placed in another sample dish, and a predetermined load is applied to all the sample grains using a load meter 1 described later. The load applied to each sample grain is
It is determined by the temperature of the water in which the sample particles are immersed. Table 1 shows the relationship between the immersion water temperature and the load.

[Table 1]

As shown in Table 1 above, for example, the water temperature is 1
When the temperature was 7 ° C, the load was 144 g, and when the immersion water temperature was 20 ° C, the load was 135 g.
Gram When the sample grain is washed rice (washed white rice) or soaked rice (for example, white rice soaked for 1 hour or more), the sample is sampled according to the load value set corresponding to the water temperature shown in Table 1. Load the grain. Table 1
As is clear from the above, the load when the sample grains are soaked rice is that the soaked rice has water penetrated into the inside of the white rice due to long-term immersion in water, and the hardness of the white rice is reduced, so The value is lower than the load applied to. Also,
In all of the white rice, washed rice, and soaked rice, the higher the soaking water temperature, the lower the load value. This is because the higher the water temperature, the larger the amount of water absorbed by the white rice, and the decrease in hardness of the white rice due to the increase in the amount of water absorbed is taken into consideration. In this way, the load value to be applied to the sample grains is changed in consideration of the hardness of the polished rice which is in inverse proportion to the water absorption amount of the polished rice, so that the sample grains can be loaded under the same conditions, and as a result, Preliminary grains for water immersion can be accurately determined.

When a predetermined load is applied to all the sample grains in accordance with the above Table 1, the split grains and crushed grains generated by the load are visually counted and used as the number of preliminary water immersion grains. In addition, the count of the water-divided split particles and the count of the water-divided preliminary particles,
Since the amount of water absorbed into the inside of the white rice changes with the passage of time, it is preferable to perform it within 10 minutes after the completion of the immersion of the sample grains.

The “water-immersion split particles” and the “water-immersion preliminary particles” thus counted are summed to obtain the mixing ratio contained in the sample particles. Then, based on this mixing ratio, the ratio of boiled cooked rice at the time of cooked rice is estimated. In estimating the boiled-cooked rice, the ratio data of boiled-cooked rice corresponding to the total number of "water-soaked grains" and "water-soaked preliminary grains" was previously obtained by experiment, and based on this data Estimate the proportion of cooked rice. FIG. 1 is a distribution graph of the experimental data. In this FIG. 1, the horizontal axis shows the mixing ratio contained in the sample grains of “water-immersed grain” and “water-immersed preliminary grain”, and the vertical axis shows the percentage of cooked cooked rice. As you can see from this figure,
It can be seen that when the mixing ratio of “water-immersed split granules” and “water-immersed preliminary granules” increases, the proportion of cooked rice that has collapsed also increases.

Next, referring to FIG. 2, the load cell 1 will be described.
An example will be described. The load meter 1 has a pen-shaped outer shape, and has a core rod 3 at one end of a pen-shaped main body 2 for applying a load by abutting against white rice. The main body 2 includes a load detecting means (load cell) 4 connected to the core rod 3, a calculation unit 5 connected to the load cell 4 to calculate a load value based on a signal from the load cell 4, and a load value. A display unit 6 as a notification unit for displaying and a power supply unit 8 using, for example, a lithium battery are provided. Thus constituted use of load meter 1, the hand grasps the body part 2, the abut the tip of the core rod 3 to the sample particle, while watching the display unit 6, a predetermined load load to be applied to the sample particle Hold the sample particles until the value is reached and use. In addition, the load meter 1 may be configured separately from the main body 2 in a state where the calculation unit 5 and the display unit 6 are connected to the load cell 4 in the main body 2 by the cable 7 (see FIG. 3). . As described above, since the load meter 1 is formed in a pen shape, it is easy to use and the work of applying a load can be easily performed.

In addition to the display unit 6 for displaying the load value, or instead of the display unit 6, the notifying unit may be provided with a load setting unit to emit a sound when the predetermined load value is reached. Of course, this does not require the user to apply a load while always looking at the display unit 6, and the work of applying a load can be further facilitated.

In the above description, the quality-determined rice grains are expressed as white rice, but the present invention also includes crushed rice and non-washed rice as quality-determined rice grains.

[0015]

EFFECTS OF THE INVENTION According to the present invention, the proportion of cooked rice to be boiled down in white rice can be estimated by immersing a predetermined amount of sample white rice for a predetermined period of time, A predetermined load is applied to the sample grains excluding the water-immersed grain, and it is performed based on the number of barrel-shaped grains (water-immersion preliminary grains) generated by this load. It is also possible to consider a water-dipping preliminary grain that becomes cooked rice. Therefore, it is possible to improve the accuracy of estimating the collapse rate of cooked rice, and thus the accuracy of the quality judgment of white rice.
Improving the accuracy of the quality judgment of white rice in this way is extremely effective for quality control of white rice in a rice mill.

[Brief description of drawings]

FIG. 1 is a distribution graph showing the correlation between the mixing ratio of water-divided grains and preliminarily water-divided grains and the ratio of cooked cooked rice.

FIG. 2 is a plan view showing the configuration of a load cell.

FIG. 3 is a plan view showing a modified example of the load cell.

FIG. 4 is a distribution graph showing a correlation between a mixing ratio of water-dipping split grains and a ratio of boiled-cooked rice.

[Explanation of symbols]

1 load cell 2 body 3 core rod 4 Load detection means (load cell) 5 computing section 6 Display (informing means) 7 cable 8 power supply

Front page continuation (72) Inventor Shiro Tajima Hiroshima Prefecture Higashi-Hiroshima City 2-30 Saijo Nishihonmachi Satake Co., Ltd. (72) Inventor Kiyo Shibuya 2-18-2 Minami Aoyama Minato-ku, Tokyo Takenaka Twin Building A Building 3rd floor, ITOCHU Rice Co., Ltd. (58) Fields surveyed (Int.Cl. ⁷ , DB name) G01N 33/10 A23L 1/10

Claims (5)

(57) [Claims] 1. A predetermined amount of sample white rice is soaked for a predetermined time, and the number of barrel grains produced by the immersion and a weight of the sample polished rice excluding the barrel grains are applied, and A method for judging quality of polished rice, which comprises estimating the collapse rate of cooked rice in polished rice based on the number. 2. Based on the total number of the crushed grains produced by water immersion and the number of crushed grains produced under a load, the mixture contained in the sample white rice in the total number. The method for determining quality of polished rice according to claim 1, wherein the proportion is calculated and the proportion of boiled rice in the polished rice is estimated based on the proportion. 3. The method for judging quality of polished rice according to claim 1 , wherein the load applied to the sample polished rice is lowered as the temperature of water for immersing the sample polished rice is higher . 4. The load is applied to the sample white rice by using a load bar having a core rod that abuts against the sample white rice to apply a load, a load detection means connected to the core rod, and an informing means for informing a user of the detected load value. Multiply by claim 1.
The method for determining quality of white rice according to claim 3. 5. The rice quality evaluation method according to 請 Motomeko 4 you, characterized in that the shape of the load meter and a pen shape.