A method for processing polished rice with low broken rice rate

Abstract

The invention discloses a method for processing polished rice with low broken rice rate, comprising the following steps: crushing rice grains into rice flour with 110-130 meshes, adding water to the rice flour through a sprayer, stirring while spraying, and mixing evenly to obtain water-containing rice flour with a water content of 7.5%-9%; weighing brown rice to be processed and water-containing rice flour according to a mass ratio of (10-25):1, and mixing the brown rice to be processed with the water-containing rice flour evenly to obtain a rice flour mixture; sending the rice flour mixture into a rice milling machine for milling, removing the water-containing rice flour and broken rice in the rice flour mixture, and obtaining polished rice. The invention makes full use of the buffering effect of the water-absorbing starch in the water-containing rice flour, reduces the mechanical loss caused by mechanical friction, thereby reducing the broken rice rate and improving the polished rice rate. At the same time, there is no need for post-processing processes such as drying and dehydration, simplifies the polished rice processing process, reduces interference from adverse factors such as heating, and ensures processing quality.

Description

Technical Field

[0001] The invention relates to the technical field of rice processing, in particular to a method for processing polished rice with low broken rice rate. Background Art

[0002] Polished rice refers to the brown rice that has been husked by a rice husker and then ground by an experimental rice mill into rice with a processing accuracy of national standard Grade 3, with a length of three quarters or more of the average length of a complete rice grain. Polished rice rate refers to the mass fraction of polished rice in the clean rice sample. Rice with a high polished rice rate has a high rice yield during processing, a low broken rice content, neat rice grains, and a high utilization rate of the edible part.

[0003] At present, the factors that affect the polished rice rate include internal factors such as the moisture content and starch content of the rice, as well as external factors such as mechanical loss caused by mechanical friction during processing. The current technology mainly controls the moisture content of the rice by mixing it with water, thereby reducing the broken rice rate. However, this method requires controlling the moisture content of the polished rice after processing and may require post-processing such as drying, otherwise it is easy to cause the rice grains to deteriorate, and the drying process may cause the rice starch to gelatinize, affecting the quality of the rice. Summary of the invention

[0004] The invention provides a polished rice processing method with low broken rice rate, so as to solve the technical problems that the current polished rice processing technology is complicated and the processing quality is unstable.

[0005] In order to solve the above technical problems, in a first aspect, the present invention provides a method for processing polished rice with a low broken rice rate, comprising the following steps:

[0006] Step 1, grinding rice grains into 110-130 mesh rice flour, adding water to the rice flour through a sprayer, stirring while spraying, and mixing evenly to obtain water-containing rice flour with a water content of 7.5% to 9%;

[0007] Step 2, weighing the brown rice to be processed and the water-containing rice flour in a mass ratio of (10-25):1, and uniformly mixing the brown rice to be processed and the water-containing rice flour to obtain a rice flour mixture;

[0008] Step 3: After the rice flour mixture is sent to a rice mill for grinding, the water-containing rice flour and broken rice in the rice flour mixture are removed to obtain polished rice.

[0009] In some embodiments, in step 1, the rice grains include at least one of commercially available broken rice and broken rice removed during the previous processing.

[0010] In some embodiments, in step 1, the rice flour is 120 mesh rice flour.

[0011] In some embodiments, the moisture content of the hydrous rice flour is 8%.

[0012] In some embodiments, in step 2, the mass ratio between the brown rice to be processed and the water-containing rice flour is (35-40):2.

[0013] In some embodiments, in step three, the rice flour mixture is milled twice by a rice milling machine, and the rotation speed of the rice milling machine is 500 rpm to 800 rpm.

[0014] In some embodiments, in step three, the water-containing rice flour in the rice flour mixture is removed by a vibrating screen, and the broken rice is removed by a broken rice separator.

[0015] In some embodiments, the polished rice is japonica rice, indica rice or glutinous rice.

[0016] In a second aspect, the present invention further provides a use of polished rice prepared by the polished rice processing method with low broken rice rate as described in the first aspect in rice products, wherein the rice products include rice, rice noodles, rice flour, rice porridge or rice cakes.

[0017] Compared with the prior art, the present invention has at least the following beneficial effects:

[0018] The invention crushes broken rice into rice flour, mixes it with water to form wet rice flour, mixes the wet rice flour with brown rice to be processed, and then grinds it with a rice mill to fully utilize the buffering effect of the water-absorbing starch in the wet rice flour, reduce the mechanical loss caused by mechanical friction, thereby reducing the broken rice rate and improving the polished rice rate. At the same time, the invention only needs to sift out the rice flour in the rice flour mixture without post-processing processes such as drying and dehydration, simplifies the polished rice processing process, reduces interference from adverse factors such as heating, and ensures processing quality.

[0019] The broken rice removed during the previous processing is used as the raw material for rice noodles to ensure that the quality of the rice noodles is similar to that of the brown rice to be processed, avoiding the adverse effects of low-quality broken rice on the quality of polished rice, thereby further ensuring the quality of polished rice processing.

[0020] The rice flour mixture is milled by multiple light milling processes to reduce mechanical loss and increase the rice polishing rate. DETAILED DESCRIPTION

[0021] In order to make the above-mentioned purpose, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below. In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present invention, so the present invention is not limited by the specific embodiments disclosed below.

[0022] As used herein, the term "prepared from" is synonymous with "comprising." As used herein, the terms "comprising," "including," "having," "containing," or any other variation thereof, are intended to cover a non-exclusive inclusion. For example, a composition, process, method, article, or apparatus that comprises the listed elements is not necessarily limited to only those elements but may include other elements not expressly listed or inherent to such composition, process, method, article, or apparatus.

[0023] When amount, concentration or other value or parameter is expressed as range, preferred range or a series of upper preferred value and lower preferred value limit range, this should be understood as specifically disclosing all ranges formed by any pairing of any range upper limit or preferred value and any range lower limit or preferred value, regardless of whether the range is disclosed separately. For example, when disclosing range "1 to 5", described range should be interpreted as including range "1 to 4", "1 to 3", "1 to 2", "1 to 2 and 4 to 5", "1 to 3 and 5" etc. When numerical range is described in this article, unless otherwise stated, the range is intended to include its end value and all integers and fractions within the range.

[0024] In addition, the indefinite articles "a" and "an" before the elements or components of the present invention have no restrictions on the quantity requirements (i.e. the number of occurrences) of the elements or components. Therefore, "a" or "an" should be interpreted as including one or at least one, and the elements or components in the singular form also include the plural form, unless the number is obviously intended to be in the singular form.

[0025] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0026] Example 1

[0027] A method for processing polished rice with low broken rice rate comprises the following steps:

[0028] Step 1, taking the broken rice removed during the last processing, crushing the broken rice into 110 mesh rice flour, then adding water to the rice flour through a sprayer, stirring while spraying, mixing evenly, to obtain the water-containing rice flour with a water content of 7.5%;

[0029] Step 2: husking japonica rice into brown rice by a rice husker, weighing the brown rice to be processed and the water-containing rice flour in a mass ratio of 10:1, and uniformly mixing the brown rice to be processed and the water-containing rice flour to obtain a rice flour mixture;

[0030] Step three, after grinding the rice flour mixture twice by a rice milling machine, removing the water-containing rice flour in the rice flour mixture by a vibrating screen, and removing the broken rice by a broken rice separator to obtain polished rice, wherein the rotation speed of the rice milling machine is 500 rpm.

[0031] Example 2

[0032] A method for processing polished rice with low broken rice rate comprises the following steps:

[0033] Step 1, taking the broken rice removed during the last processing, crushing the broken rice into 120 mesh rice flour, then adding water to the rice flour through a sprayer, stirring while spraying, mixing evenly, to obtain the water-containing rice flour with a water content of 8%;

[0034] Step 2: husking japonica rice into brown rice by a rice husker, weighing the brown rice to be processed and the water-containing rice flour in a mass ratio of 35:2, and uniformly mixing the brown rice to be processed and the water-containing rice flour to obtain a rice flour mixture;

[0035] Step three, after grinding the rice flour mixture twice by a rice milling machine, removing the water-containing rice flour in the rice flour mixture by a vibrating screen, and removing the broken rice by a broken rice separator to obtain polished rice, wherein the rotation speed of the rice milling machine is 650 rpm.

[0036] Example 3

[0037] A method for processing polished rice with low broken rice rate comprises the following steps:

[0038] Step 1, taking the broken rice removed during the last processing, crushing the broken rice into 120 mesh rice flour, then adding water to the rice flour through a sprayer, stirring while spraying, mixing evenly, to obtain the water-containing rice flour with a water content of 8%;

[0039] Step 2: husking japonica rice into brown rice by a rice husker, weighing the brown rice to be processed and the water-containing rice flour in a mass ratio of 40:2, and uniformly mixing the brown rice to be processed and the water-containing rice flour to obtain a rice flour mixture;

[0040] Step three, after grinding the rice flour mixture twice by a rice milling machine, removing the water-containing rice flour in the rice flour mixture by a vibrating screen, and removing the broken rice by a broken rice separator to obtain polished rice, wherein the rotation speed of the rice milling machine is 650 rpm.

[0041] Example 4

[0042] A method for processing polished rice with low broken rice rate comprises the following steps:

[0043] Step 1, taking the broken rice removed during the last processing, crushing the broken rice into 130 mesh rice flour, then adding water to the rice flour through a sprayer, stirring while spraying, mixing evenly, to obtain the water-containing rice flour with a water content of 9%;

[0044] Step 2: husking japonica rice into brown rice by a rice husker, weighing the brown rice to be processed and the water-containing rice flour in a mass ratio of 25:1, and uniformly mixing the brown rice to be processed and the water-containing rice flour to obtain a rice flour mixture;

[0045] Step three, after grinding the rice flour mixture twice by a rice milling machine, removing the water-containing rice flour in the rice flour mixture by a vibrating screen, and removing the broken rice by a broken rice separator to obtain polished rice, wherein the rotation speed of the rice milling machine is 800 rpm.

[0046] Comparative Example 1

[0047] The difference from Example 2 is that in Comparative Example 1, no water-containing rice flour is added, and the brown rice to be processed is directly ground, and the rest is the same as in Example 2.

[0048] Comparative Example 2

[0049] The difference from Example 2 is that Comparative Example 2 adopts the processing technology of the background technology, mixing the japonica rice with water until the water content of the rice is 14%, then husking the japonica rice into brown rice, and directly grinding the brown rice, and the rest is the same as Example 2.

[0050] Comparative Example 3

[0051] The difference from Example 2 is that the rice flour of Comparative Example 3 is not added with water, but the rice flour after the rice grains are crushed is directly mixed with the brown rice to be processed, and the rest is the same as Example 2.

[0052] Comparative Example 4

[0053] The difference with Example 2 is that the water content of the water-containing rice flour of Comparative Example 4 is 15%, and other is with Example 2.

[0054] Comparative Example 5

[0055] The difference with embodiment 2 is that the water content of the moisture rice flour of comparative example 5 is 2%, and other is with embodiment 2.

[0056] Comparative Example 6

[0057] The difference from Example 2 is that in Comparative Example 6, the mass ratio of the brown rice to be processed to the water-containing rice flour is 1:1, and the rest is the same as in Example 2.

[0058] Comparative Example 7

[0059] The difference from Example 2 is that in Comparative Example 7, the mass ratio of the brown rice to be processed to the water-containing rice flour is 50:1, and the rest is the same as in Example 2.

[0060] The bran content of the polished rice cortex of Examples 1 to 4 and Comparative Examples 1 to 7 was observed, the polished rice rates of Examples 1 to 4 and Comparative Examples 1 to 7 were measured according to GB / T 21719-2008, and the broken rice rates of Examples 1 to 4 and Comparative Examples 1 to 7 were measured according to GB / T 5503-2009. The measurement results are shown in Table 1.

[0061] Table 1 Determination results of polished rice rate and broken rice rate

[0062] Sample Rice mass / kg Polished rice weight / kg Broken rice weight / kg Rice polishing rate / % Broken rice rate / % Example 1 50.01 31.62 1.57 63.23 4.97 Example 2 50.00 33.23 1.66 66.46 5.00 Example 3 50.02 32.85 1.67 65.67 5.08 Example 4 50.01 31.21 1.63 62.41 5.22 Comparative Example 1 50.00 27.34 7.36 54.68 26.92 Comparative Example 2 50.00 31.58 2.42 63.16 7.66 Comparative Example 3 50.01 28.54 5.96 57.07 20.88 Comparative Example 4 50.00 32.28 0.43 64.56 1.33 Comparative Example 5 50.01 29.32 4.58 58.63 15.62 Comparative Example 6 50.02 33.15 0.72 66.27 2.17 Comparative Example 7 50.00 27.74 6.26 55.18 22.69

[0063] As can be seen from Table 1, the polished rice rates of Examples 1 to 4 all reached more than 62.41%, and the broken rice rate was less than 5.22%, which was slightly better than the broken rice rate of the conventional processing technology of Comparative Example 2. It was observed that the polished rice cortex of Examples 1 to 4 had no bran powder, and achieved a low broken rice rate and excellent bran removal effect; compared with Comparative Examples 1, 3, 5 and 7, Examples 1 to 4 can significantly improve the polished rice rate and reduce the broken rice rate. Although Comparative Examples 4 and Comparative Example 6 have very low broken rice rates, it was observed that there was a large amount of bran powder in the polished rice cortex that was not removed, and the bran removal effect was poor, and the polished rice processing requirements could not be met.

[0064] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0065] The specific embodiments described above further illustrate the purpose, technical solutions and beneficial effects of the present invention. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the scope of protection of the present invention. It is particularly pointed out that for those skilled in the art, any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the scope of protection of the present invention.

Claims

1. A method for processing polished rice with low broken rice rate, characterized in that: The following steps are involved: Step 1, grinding the rice grains into 110-130 mesh rice flour, then adding water to the rice flour through a sprayer, stirring while spraying, and mixing evenly to obtain water-containing rice flour with a water content of 7.5%-9%; Step 2, weighing the brown rice to be processed and the water-containing rice flour in a mass ratio of (10-25):1, and uniformly mixing the brown rice to be processed and the water-containing rice flour to obtain a rice flour mixture; Step 3: After the rice flour mixture is sent to a rice mill for grinding, the water-containing rice flour and broken rice in the rice flour mixture are removed to obtain polished rice.

2. The method for processing polished rice with low broken rice rate as claimed in claim 1, wherein: In the step 1, the rice grains include at least one of commercially available broken rice and broken rice removed during the previous processing.

3. The method for processing polished rice with low broken rice rate as claimed in claim 1, characterized in that: In the step 1, the rice noodles are 120 mesh rice noodles.

4. The method for processing polished rice with low broken rice rate as claimed in claim 1, characterized in that: The water content of the water-containing rice flour is 8%.

5. The method for processing polished rice with low broken rice rate as claimed in claim 1, characterized in that: In the step 2, the mass ratio of the brown rice to be processed to the water-containing rice flour is (35-40):

2.

6. The method for processing polished rice with low broken rice rate as claimed in claim 1, characterized in that: In the step three, the rice flour mixture is milled twice by a rice milling machine, and the rotation speed of the rice milling machine is 500 rpm to 800 rpm.

7. The method for processing polished rice with low broken rice rate as claimed in claim 1, characterized in that: In the step three, the water-containing rice flour in the rice flour mixture is removed by a vibrating screen, and the broken rice is removed by a broken rice separator.

8. The method for processing polished rice with low broken rice rate as claimed in claim 1, characterized in that: The polished rice is polished japonica rice, indica rice or glutinous rice.

9. Use of polished rice prepared by the polished rice processing method with low broken rice rate according to any one of claims 1 to 8 in rice products, characterized in that: The rice products include rice, rice noodles, rice flour, rice porridge or rice cakes.