CN110496662A - A kind of processing method of indica rice with preserved germ and rice with retained germ - Google Patents

Abstract

The invention discloses a processing method for indica rice with germ preservation and rice with germ retention, and relates to the technical field of grain processing. The indica rice germ preservation processing method comprises the following steps: sequentially screen the indica rice, separate the hulled rice and the paddy to form indica brown rice; use an iron roller rice mill to whiten the indica brown rice; After the indica brown rice is purified, the germ rice is obtained; wherein, during the whitening process, the rolling distance is three machines in series and the whitening pressure ratio of the three machines according to the processing sequence is (4.8～5.1): (3～ 2): 1. The indica rice treated by the method of the invention can still retain more germs, not only the germ-retained rice made from indica rice can be obtained, but also the germ retention rate can reach more than 85%. In addition, compared with the existing japonica rice processing method, the method of the invention greatly reduces the energy consumption of the rice mill.

Description

A kind of processing method of indica rice with preserved germ and rice with retained germ

technical field

The invention relates to the technical field of grain processing, in particular to a method for processing indica rice with germ preservation and rice with germ retention.

Background technique

Germ rice, also known as germ rice, refers to polished rice whose germ retention rate can reach more than 80% after milling and processing, and meets the rice grade standard. As the primary and meristematic tissue of rice, the germ is the most physiologically active part of the grain. The germ is rich in essential trace elements such as protein, fat, soluble sugar, multivitamins, calcium and iron, etc. The nutritional components contained in rice germ account for more than 70% of the total nutritional components of rice. With people's pursuit of health and nutrition, in recent years, germ rice has become the first choice of consumers.

Germ retention rate refers to the percentage of germ remaining grains in the rice sample. Japonica rice grains are plump and thick, and the cross-section is similar to a circle. It can withstand greater milling force and has a higher embryo retention rate after refining. Therefore, most of the existing rice germ preservation processing technologies use japonica rice as raw material. However, the taste of Japonica rice is different from that of Indica rice. For consumers who like to eat Indica rice, the existing embryo rice cannot meet their needs. In addition, Japonica rice has a long growth cycle and its grain structure is compact, which leads to energy consumption during milling. Higher, but indica rice has two or more seasons a year and the grain structure is loose. It will be more economical if a method of embryo preservation processing for indica rice can be developed. However, due to the long and narrow grains of indica rice and the flat cross section, the germ retention rate after refining is low, and there is no technology for processing indica rice into germ retention rice.

Contents of the invention

The main purpose of the present invention is to provide a method for processing indica rice with germ preservation and rice with germ retention, aiming to provide a method for preparing rice with germ retention using indica rice as raw material.

In order to achieve the above object, the present invention proposes a processing method for preserving the germ of indica rice, which comprises the following steps:

The indica rice is screened, hulled and paddy separated in sequence to form indica brown rice;

Adopting an iron roller rice mill to whiten the indica brown rice;

Purifying the indica brown rice after the whitening treatment to obtain germ rice;

Wherein, during the whitening treatment, the rolling process is three machines connected in series, and the whitening pressure ratio of the three machines according to the processing sequence is (4.8-5.1):(3-2):1.

Optionally, in the step of sequentially screening indica rice, husking, and paddy separation to form indica brown rice, the moisture content of the indica rice is 14.8-15 wt%, and the germ retention rate is not less than 99%.

Optionally, the steps of screening indica rice, husking, and paddy separation to form indica brown rice include:

Remove weeds, plant roots, dust and light impurities in indica rice;

Remove heavy impurities in indica rice;

Magnetic separation to remove metal impurities;

Use a huller to remove the chaff from the indica rice;

Indica brown rice was obtained by separating rice and husk from hulled indica rice.

Optionally, in the step of using an iron roller rice mill to whiten the indica brown rice,

The rice milling time of each iron roller rice mill is 15-25s.

Optionally, in the step of whitening the indica brown rice with an iron roller rice mill, the rotational speed of the iron roller rice mill is 960-1000 r/min.

Optionally, according to the processing sequence, the rotation speeds of the three machines are 1000r/min, 970r/min, and 960r/min in sequence.

Optionally, in the step of using an iron roller rice mill to whiten the indica brown rice, the process parameters of the iron roller rice mill are: the included angle between the rice gluten and the centerline of the rice mill roller is 2 °～3°, the gap between the whitening chambers is 8.6～9.0mm.

Optionally, the step of purifying the indica brown rice after the whitening treatment to obtain germ rice includes:

The indica brown rice after the whitening treatment is destoned, magnetically separated, and color sorted in sequence to obtain embryo rice.

The present invention also proposes a rice with retained germ, which is prepared by the above-mentioned indica rice germ-preserved processing method.

Optionally, the germ retention rate of the rice with germ retention is not less than 85%.

In the technical solution provided by the present invention, by adopting the method of light milling with three machines connected in series and regulating the whitening pressure, the indica rice treated by the method of the present invention can still retain more germs, and not only can obtain indica rice as raw material The prepared rice with germ remaining has a germ retention rate of more than 85%. In addition, compared with the existing japonica rice processing method, the method of the invention greatly reduces the energy consumption of the rice mill.

Detailed ways

In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below. Apparently, the described embodiments are only some of the embodiments of the present invention, not all of them.

It should be noted that, those without specific conditions indicated in the examples were carried out according to conventional conditions or conditions suggested by the manufacturer. The reagents or instruments used were not indicated by the manufacturer, and they were all conventional products that could be purchased from the market. In addition, the meaning of "and/or" appearing in the whole text includes three parallel schemes, taking "A and/or B" as an example, including scheme A, scheme B, or schemes that both A and B satisfy. In addition, the technical solutions of various embodiments can be combined with each other, but it must be based on the realization of those skilled in the art. When the combination of technical solutions is contradictory or cannot be realized, it should be considered that the combination of technical solutions does not exist , nor within the scope of protection required by the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

Germ retention rate refers to the percentage of germ remaining grains in the rice sample. Japonica rice grains are plump and thick, and the cross-section is similar to a circle. It can withstand greater milling force and has a higher embryo retention rate after refining. Therefore, most of the existing rice germ preservation processing technologies use japonica rice as raw material. However, the taste of Japonica rice is different from that of Indica rice. For consumers who like to eat Indica rice, the existing embryo rice cannot meet their needs. In addition, Japonica rice has a long growth cycle and its grain structure is compact, which leads to energy consumption during milling. Higher, but indica rice has two or more seasons a year and the grain structure is loose. It will be more economical if a method of embryo preservation processing for indica rice can be developed. However, due to the long and narrow grains of indica rice and the flat cross section, the germ retention rate after refining is low, and there is no technology for processing indica rice into germ retention rice.

In view of this, the present invention proposes an indica rice germ preservation processing method, and Fig. 1 is an embodiment of the indica rice germ preservation processing method of the present invention. The method of the present invention adopts the light milling method of three machines connected in series and regulates the whitening pressure, so that the indica rice treated by the method of the present invention can still retain more germs, and not only can obtain the remaining embryos made from indica rice. Rice, and the germ retention rate can reach more than 85%. In addition, compared with the existing japonica rice processing method, the method of the invention greatly reduces the energy consumption of the rice mill.

Referring to Fig. 1, the indica rice germ preservation processing method of the present embodiment comprises the following steps:

Step S10, the indica rice is sequentially screened, hulled, and paddy separated to form indica brown rice.

Wherein, the moisture content of the indica rice is 14.8-15 wt%, and the germ retention rate is not less than 99%.

Indica rice has the effects of nourishing qi, nourishing yin, moistening dryness, nourishing qi and nourishing the heart, nourishing the liver and nourishing the body, benefiting the essence and strengthening the will, harmonizing the five internal organs, promoting blood vessels, improving ears and eyesight, relieving restlessness, quenching thirst and relieving diarrhea. Regular consumption of indica rice can prevent diabetes and beriberi, eliminate oral inflammation and bad breath, stimulate the secretion of gastric juice, help digestion, and promote the absorption of fat. The yield of indica rice is higher, usually two or more seasons a year, and the planting efficiency is better than that of japonica rice, and the economic benefit of using indica rice as a raw material for preparing germ rice is better.

The water content and germ retention rate of indica rice as raw material are important factors affecting the germ preservation processing effect. Indica rice with a water content of 14.8-15% by weight and a germ retention rate of not less than 99% is preferred in this embodiment as a raw material.

During specific implementation, step S10 can be realized through the following steps:

Step S11, removing weeds, plant rhizomes, dust and light impurities in the indica rice;

Step S12, removing heavy impurities in indica rice;

Step S13, magnetic separation to remove metal impurities;

Step S14, using a huller to remove the chaff from the indica rice;

Step S15. Separating rice and paddy from the hulled indica rice to obtain indica brown rice.

The function of steps S11 and S12 is to remove some light or heavy impurities mixed in the raw material of indica rice. During specific implementation, any known impurity removal method can be used, such as vibrating screen, winnowing, etc. The machine winnows the indica rice to remove light impurities such as weeds, plant roots and dust in the indica rice, and then puts the indica rice in a vibrating sieve to remove heavy impurities such as stones and soil clods in the indica rice.

In this embodiment, a magnetic separator is used to adsorb metal impurities in indica rice.

In addition, the indica rice treated in step S14 includes indica brown rice, chaff, and indica rice, etc., which need further paddy separation. Specifically, different weights and particle sizes of several components can be used to separate the paddy by using a paddy separation sieve or gravity paddy Separators and other equipment used for paddy separation remove chaff, collect indica brown rice, and re-send indica rice to the huller to remove chaff.

Step S20, using an iron roller rice mill to whiten the indica brown rice. Wherein, during the whitening treatment, the rolling process is three machines connected in series, and the whitening pressure ratio of the three machines according to the processing sequence is (4.8-5.1):(3-2):1.

Unlike japonica rice, indica rice has a loose grain structure and slender grains, which have limited tolerance to grinding. In this embodiment, three iron roller rice mills connected in series are used to lightly mill the indica brown rice three times, while controlling the whitening pressure during the three light mills. According to the processing sequence, the first light milling, the second light milling During the milling and the third light milling, the corresponding whitening pressure ratios are (4.8-5.1):(3-2):1. In this way, it can be ensured that the germ of the indica rice is well preserved, and the germ retention rate of the obtained rice with retained germ is higher than 85%. In addition, for the conventional processing method of japonica rice with germ preservation, the processing method of the present invention only needs three machines connected in series and the required whitening pressure is relatively low, thereby greatly reducing the energy consumption of the processing process.

Further, in this embodiment, the process parameters of the rice mill are controlled: the rice milling time of each iron roller rice mill is 15-25s; the speed of the iron roller rice mill is 960-1000r/min; The included angle between the ribs and the center line of the rice milling roller is 2°-3°, and the gap between the milling chambers is 8.6-9.0mm.

Furthermore, the rotational speed of each rice mill can also be different. In this embodiment, according to the processing sequence, the first light milling, the second light milling and the third light milling respectively correspond to a rotational speed of 1000r/min. , 970r/min, 960r/min. In this way, the rice milling speed can be adjusted corresponding to the processing degree of indica rice, which can not only avoid energy loss and reduce waste, but also keep the rice embryo more complete and reduce the amount of broken rice.

Step S30, purifying the indica brown rice after the whitening treatment to obtain germ rice.

In this embodiment, the indica brown rice after the whitening treatment is destoned, magnetically separated, and color sorted in sequence to obtain germ rice.

In addition, based on the above-mentioned indica rice germ-preserving processing method, the present invention also proposes a germ-retaining rice, which can be prepared according to the above-mentioned indica rice germ-preserving processing method. Specifically, the indica rice is sequentially screened, hulled, and paddy separated to form indica brown rice; then, the indica brown rice is whitened with an iron roller rice mill, and during the whitening process, the milling process is three machines connected in series. And according to the processing sequence, the whitening pressure ratio of the three machines is (4.8-5.1): (3-2): 1; finally, the indica brown rice after the whitening treatment is purified to obtain the remaining Germ rice.

In this embodiment, the germ retention rate of the rice with germ retention is not less than 85%.

The technical solutions of the present invention will be described in further detail below in conjunction with specific embodiments and accompanying drawings. It should be understood that the following embodiments are only used to explain the present invention and are not intended to limit the present invention.

Example 1

Select the indica rice with a water content of 15wt% and a germ retention rate of not less than 99%; use an exhaust fan to carry out winnowing to remove light impurities such as weeds, plant roots, and dust in the indica rice; then place the indica rice in a vibrating sieve to remove Remove heavy impurities such as stones and soil clods mixed in the indica rice; then use a magnetic separator to remove metal impurities in the indica rice. Use a rice huller to remove the chaff from the screened and removed indica rice, and then send it to the paddy separation equipment for paddy separation to obtain indica brown rice. The separated indica rice is sent to the huller to remove the chaff again.

Use three iron roller rice mills connected in series to do three light mills on indica brown rice, and control the whitening pressure ratios for the first light mill, the second light mill, and the third light mill in accordance with the processing sequence It is 5:3:1; the corresponding speeds are 1000r/min, 970r/min, 960r/min in turn. The rice milling time of each iron roller rice mill is 20s. Among them, the diameter of the rice milling roller of the iron roller rice milling machine used is 90 mm, the length is 300 mm, the angle between the rice milling gluten and the centerline of the rice milling roller is 2°, and the gap between the whitening chambers is 8.6 mm.

The indica brown rice after the whitening treatment is subjected to the second stone removal and the second magnetic separation in sequence, and then sent to the color sorter for color sorting to remove chaff, green grains, yellow grains and overwhite grains , have to leave the finished product of embryonic rice. According to the statistics, the germ retention rate of rice with germ retention is 90%, and the rate of broken rice is less than 6%.

Example 2

Select the indica rice with a water content of 14.87Wt% and a germ retention rate of not less than 99%; air selection is carried out with an exhaust fan to remove light impurities such as weeds, plant roots, and dust in the indica rice; then the indica rice is placed in a vibrating sieve, Remove heavy impurities such as stones and soil clods mixed in the indica rice; then use a magnetic separator to remove metal impurities in the indica rice. Use a rice huller to remove the chaff from the screened and removed indica rice, and then send it to the paddy separation equipment for paddy separation to obtain indica brown rice. The separated indica rice is sent to the huller to remove the chaff again.

Use three iron roller rice mills connected in series to do three light mills on indica brown rice, and control the whitening pressure ratios for the first light mill, the second light mill, and the third light mill in accordance with the processing sequence It is 5.1:2.7:1; the corresponding speeds are 1000r/min, 980r/min, 980r/min in turn. The rice milling time of each iron roller rice mill is 22s. Among them, the diameter of the rice roller of the iron roller rice mill used is 90 mm, the length is 300 mm, the angle between the rice gluten and the center line of the rice roller is 2.3°, and the gap between the whitening chambers is 8.9 mm.

The indica brown rice after the whitening treatment is subjected to the second stone removal and the second magnetic separation in sequence, and then sent to the color sorter for color sorting to remove chaff, green grains, yellow grains and overwhite grains , have to leave the finished product of embryonic rice. According to the statistics, the germ retention rate of rice with germ retention is 86%, and the rate of broken rice is less than 5%.

Example 3

Select the indica rice with a water content of 15wt% and a germ retention rate of not less than 99%; use an exhaust fan to carry out winnowing to remove light impurities such as weeds, plant roots, and dust in the indica rice; then place the indica rice in a vibrating sieve to remove Remove heavy impurities such as stones and soil clods mixed in the indica rice; then use a magnetic separator to remove metal impurities in the indica rice. Use a rice huller to remove the chaff from the screened and removed indica rice, and then send it to the paddy separation equipment for paddy separation to obtain indica brown rice. The separated indica rice is sent to the huller to remove the chaff again.

Use three iron roller rice mills connected in series to do three light mills on indica brown rice, and control the whitening pressure ratios for the first light mill, the second light mill, and the third light mill in accordance with the processing sequence It is 4.8:3:1; the corresponding speeds are 980r/min, 980r/min, 980r/min in turn. The rice milling time of each iron roller rice mill is 20s. Among them, the diameter of the rice roller of the iron roller rice mill used is 90mm, the length is 300mm, the angle between the rice gluten and the center line of the rice roller is 2.5°, and the gap between the whitening chambers is 8.8mm.

The indica brown rice after the whitening treatment is subjected to the second stone removal and the second magnetic separation in sequence, and then sent to the color sorter for color sorting to remove chaff, green grains, yellow grains and overwhite grains , have to leave the finished product of embryonic rice. According to the statistics, the germ retention rate of rice with germ retention is 88%, and the rate of broken rice is less than 5%.

Example 4

Select the indica rice with a moisture content of 14.9Wt% and a germ retention rate of not less than 99%; air selection is carried out with an exhaust fan to remove light impurities such as weeds, plant roots, and dust in the indica rice; then the indica rice is placed in a vibrating sieve, Remove heavy impurities such as stones and soil clods mixed in the indica rice; then use a magnetic separator to remove metal impurities in the indica rice. Use a rice huller to remove the chaff from the screened and removed indica rice, and then send it to the paddy separation equipment for paddy separation to obtain indica brown rice. The separated indica rice is sent to the huller to remove the chaff again.

Use three iron roller rice mills connected in series to do three light mills on indica brown rice, and control the whitening pressure ratios for the first light mill, the second light mill, and the third light mill in accordance with the processing sequence It is 4.9:2:1; the corresponding speeds are 960r/min, 960r/min, 960r/min in turn. The rice milling time of each iron roller rice mill is 25s. Among them, the diameter of the rice milling roller of the iron roller rice milling machine used is 90 mm, the length is 300 mm, the angle between the rice milling gluten and the center line of the rice milling roller is 3°, and the gap between the whitening chambers is 8.6 mm.

The indica brown rice after the whitening treatment is subjected to the second stone removal and the second magnetic separation in sequence, and then sent to the color sorter for color sorting to remove chaff, green grains, yellow grains and overwhite grains , have to leave the finished product of embryonic rice. According to the statistics, the germ retention rate of rice with germ retention is 89%, and the rate of broken rice is less than 5%.

Example 5

Select indica rice with a moisture content of 14.8Wt% and a germ retention rate of not less than 99%; air selection is carried out with a fan to remove light impurities such as weeds, plant rhizomes, and dust in the indica rice; then the indica rice is placed in a vibrating sieve, Remove heavy impurities such as stones and soil clods mixed in the indica rice; then use a magnetic separator to remove metal impurities in the indica rice. Use a rice huller to remove the chaff from the screened and removed indica rice, and then send it to the paddy separation equipment for paddy separation to obtain indica brown rice. The separated indica rice is sent to the huller to remove the chaff again.

Use three iron roller rice mills connected in series to do three light mills on indica brown rice, and control the whitening pressure ratios for the first light mill, the second light mill, and the third light mill in accordance with the processing sequence It is 5:2.5:1; the corresponding speeds are 1000r/min, 1000r/min, 1000r/min in turn. The rice milling time of each iron roller rice mill is 15s. Wherein, the diameter of the rice milling roller of the iron roller rice milling machine used is 90 mm, the length is 300 mm, the angle between the rice milling gluten and the center line of the rice milling roller is 3°, and the gap between the whitening chambers is 9.0 mm.

The indica brown rice after the whitening treatment is subjected to the second stone removal and the second magnetic separation in sequence, and then sent to the color sorter for color sorting to remove chaff, green grains, yellow grains and overwhite grains , have to leave the finished product of embryonic rice. According to the statistics, the germ retention rate of rice with germ retention is 86%, and the rate of broken rice is less than 6%.

The above are only preferred embodiments of the present invention, and are not intended to limit the patent scope of the present invention. For those skilled in the art, the present invention may have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the scope of patent protection of the present invention.

Claims (10)

1. a kind of indica rice preservation processing method, is characterized in that, comprises the following steps: The indica rice is screened, hulled and paddy separated in sequence to form indica brown rice; Adopting an iron roller rice mill to whiten the indica brown rice; Purifying the indica brown rice after the whitening treatment to obtain germ rice; Wherein, during the whitening treatment, the rolling process is three machines connected in series, and the whitening pressure ratio of the three machines according to the processing sequence is (4.8-5.1):(3-2):1. 2. The method for processing germ-preserved indica rice as claimed in claim 1, characterized in that, in the step of forming indica brown rice through screening, husking and paddy separation of indica rice, the water content of the indica rice is 14.8-2. 15wt%, the embryo retention rate is not less than 99%. 3. the indica rice embryo preservation processing method as claimed in claim 1, is characterized in that, described indica rice is successively screened, hulled, and paddy-grain separated, and the step of forming indica brown rice comprises: Remove weeds, plant roots, dust and light impurities in indica rice; Remove heavy impurities in indica rice; Magnetic separation to remove metal impurities; Use a huller to remove the chaff from the indica rice; Indica brown rice was obtained by separating rice and husk from hulled indica rice. 4. the indica rice germ preservation processing method as claimed in claim 1, is characterized in that, in the step of described adopting iron roller rice mill to whitening process of described indica brown rice, The rice milling time of each iron roller rice mill is 15-25s. 5. The indica rice preservation processing method according to claim 1, characterized in that, in the step of using an iron roller rice mill to whiten the indica brown rice, the rotating speed of the iron roller rice mill is 960 ~1000r/min. 6. The method for processing indica rice germ preservation as claimed in claim 5, characterized in that, according to the processing sequence, the rotating speeds of the three machines are 1000r/min, 970r/min, and 960r/min in sequence. 7. the indica rice germ preservation processing method as claimed in claim 1, is characterized in that, in the step of described adopting iron roller rice mill to whiten described indica brown rice, the technological parameter of described iron roller rice mill is : The included angle between the rice gluten and the center line of the rice milling roller is 2°～3°, and the gap between the whitening chambers is 8.6～9.0mm. 8. The method for processing indica rice germ preservation as claimed in claim 1, wherein the step of purifying the indica brown rice after the whitening treatment to obtain embryo rice comprises: The indica brown rice after the whitening treatment is destoned, magnetically separated, and color sorted in sequence to obtain embryo rice. 9. A kind of germ-retaining rice, it is characterized in that, it is obtained by the indica rice germ-preserving processing method as described in any one of claims 1 to 8. 10. The rice with retained germ according to claim 9, characterized in that the germ-retained rate of the rice with retained germ is not less than 85%.