LS/T 6116-2017 Classification and determination of rice grain types LS/T6116-2017 |tt||Standard compression package decompression password: www.bzxz.net
This standard specifies the terms and definitions, classification, determination rules and inspection methods for the classification and inspection methods of rice grain types. ? This standard applies to rice, brown rice and glutinous rice.

ICS67.060
Grain Industry Standard of the People's Republic of China
LS/T 6116—2017
Classification and judgement of rice in grain
shape2017-06-14 release
State Grain Administration
2017-06-14 implementation
Grain of the People's Republic of China
Industry standard
Rice grain shape classification
LS/T6116-2017
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This standard was drafted in accordance with the rules given in GB/T1.1-2009 LS/T6116-2017
This standard replaces LS/T6116-2016 "Classification and Determination of Rice Grain Type". Compared with LS/T6116-2016, the main changes of this standard are as follows:
1. The scope of the standard and normative reference documents have been modified; the judgment rules have been modified.
This standard refers to the classification method of rice grain types in CODEX STAN 1981995. This standard is proposed by the State Administration of Grain.
This standard is under the jurisdiction of the National Technical Committee for Grain and Oil Standardization (SAC/TC270). The main drafting units of this standard are: Standard Quality Center of the State Administration of Grain, Liaoning Grain and Oil Inspection and Monitoring Institute, Beijing Dongfu Jiuheng Instrument Technology Co., Ltd., Hubei Grain and Oil Food Quality Monitoring Station, Heilongjiang Grain and Oil Hygiene Inspection and Monitoring Station, Fujian Grain and Oil Quality Monitoring Institute, Jiangxi Grain and Oil Quality Supervision and Inspection Center, Anhui Grain and Oil Product Quality Supervision and Inspection Station. The main drafters of this standard are: Xu Guangchao, Wei Lili, Zhu Zhiguang, Cui Guohua, Yu Suping, Yang Dongping, Xiong Ning, Liu Li, Song Xiujuan, Huang Jianli, Mo Ni, Hu Bin, Yu Wei, Min Guochun, Qiao Lina. The previous versions of the standards replaced by this standard are: LS/T6116—2016.
1 Scope
Classification and determination of rice grain types
LS/T6116-—2017
This standard specifies the terms and definitions, classification, determination rules and inspection methods for the classification and inspection methods of rice grain types. This standard applies to rice, brown rice and glutinous rice. Normative references
The following documents are indispensable for the application of this document. For all dated references, only the dated versions apply to this document. For all undated references, the latest versions (including all amendments) apply to this document. GB1354 Rice
GB5491 Grain and oil inspection sampling and subsampling method 5 Grain and oil inspection inspection method for grain type
GB/T24535
Terms and definitions
The following terms and definitions apply to this document. 3.1
Husked rice
The product after rice is husked.
Milled rice: white rice
The general term for the finished grain obtained by husking and milling rice. 3.3
Long grain rice
Rice that meets the requirements of long grain rice in Table 1 generally corresponds to the grain type of glazed rice and glazed polished rice in GB1354. 3.4
medium to short grain rice
Medium to short grain rice
Rice that meets the requirements of medium to short grain rice in Table 1 generally corresponds to the grain types of stalked rice and stalked glutinous rice in GB1354. 3.5
the kernel length
The maximum distance between the two ends of a complete and undamaged rice grain, expressed as the average grain length of 6g to 10g samples. 3.6
the kernel width
The maximum distance between the dorsal and ventral sides of a complete and undamaged rice grain, expressed as the average grain width of 6g to 10g samples. 3.7
kernellength/widthratio
The ratio of the length to width of a complete and undamaged rice kernel, expressed as the average value of the kernel length/width ratio of 6g to 10g samplesLS/T6116—2017
4 Classification
Rice is divided into long-grain rice and medium-short-grain rice according to its kernel length and length-width ratio. The two different grain types of rice should comply with the requirements of Table 1. After brown rice is ground into rice of grade 3 according to the processing accuracy of GB1354, the grain type classification should comply with the requirements of Table 1. Table 1 Grain type classification requirements wwW.bzxz.Net
Long grain rice
Medium and short grain rice
Test method
Grain length/mm
Grain length and length-to-width ratio shall be determined according to the method specified in Appendix A 6
Judgment rules
Long grain rice
If one of the grain length and length-to-width ratio meets the requirements of Table 1 "Long grain rice", it shall be determined as long grain rice. Medium and short grain rice
If both the grain length and length-to-width ratio meet the requirements of Table 1 "Medium and short grain", it shall be determined as medium and short grain rice. 2
Length-to-width ratio
A.1 Image analysis method
Instruments and equipment
Appendix A
(Normative Appendix)
Determination of grain length and length-to-width ratio of rice and brown rice LS/T6116—20 17
A.1.1.1 Broken rice sorter: It has the function of separating intact rice from broken rice. The sample amount is 10g~20gA.1.1.2 Vernier caliper: The accuracy is 0.02mm. A.1.1.3 Rice appearance quality tester: It has the function of image acquisition and analysis, and can automatically calculate the grain length, grain width and average length-to-width ratio of rice. The measurement error of the average length of the grain type does not exceed 0.1mm. The error detection method is as follows: Randomly select 10 intact rice grains, put them into the rice appearance quality tester, and use the instrument to measure the average length of the rice grains once, and repeat the measurement twice; then use a vernier caliper to measure the length of the same rice grains one by one, calculate the average length of the 10 rice grains, and repeat the measurement twice.
Calculate the average of the two instrument test results and the average of the two vernier caliper test results as the test results of the instrument and the vernier caliper respectively
Calculate the difference between the instrument and vernier caliper measurement results. 2 Working principle
Place the sample to be tested on the image acquisition device. The instrument automatically collects the sample appearance image and converts it into recognizable image data. The image analysis system performs data processing and judgment analysis to calculate the average grain length and average aspect ratio of the sample. A.1.3 Determination steps
A.1.3.1 Sample the rice according to GB5491 to obtain about 10g of sample, manually pick out impurities, and use a broken rice sorter to separate the intact and undamaged rice to ensure that its mass is not less than 6g; if it is a brown rice sample, first use an experimental rice mill to process it into a sample that meets the requirements. After the third-grade rice in accordance with GB1354 is obtained, the above method is followed.
A.1.3.2 Start the rice appearance quality detector according to the instrument manual and put it in the measuring state. A.1.3.3 Place the sample to be tested (A.1.3.1) in the image acquisition device and operate according to the instrument manual. The image analysis system automatically analyzes and determines the image information of the sample and calculates the average grain length (L) and average aspect ratio (D) of the whole batch of samples. A.1.3.4 Enter the grain shape analysis interface to check whether the judgment of intact and undamaged rice is wrong. If necessary, the manual judgment function can be used on the software interface to assist in selecting grains that do not meet the requirements of intact and undamaged rice, and recalculate and confirm that the grain shape detection results of intact and undamaged rice are correct. The sample is tested in pairs at the same time.
Result representation
A.1.4.1 Average grain length
Calculation is shown in formula (A.1):
...(A.1)
Where:
L-average grain length of the sample, in millimeters (mm); LS/T6116-2017
length of a single rice grain, in millimeters (mm); the number of intact and undamaged rice grains actually detected. The measurement result is retained to one decimal place. If the double test results meet the repeatability requirements, the average value of the double test results is calculated to express the measurement result.
Average length-to-width ratio
Calculation is shown in formula (A.2):
Where:
Average length-to-width ratio of the sample;
length of a single rice grain, in millimeters (mm); width of a single rice grain, in millimeters (mm); the number of intact and undamaged rice grains actually detected. 1 small
...(A.2)
The measurement result is retained to one decimal place. If the double test results meet the repeatability requirements, the average value of the double test results is calculated to express the measurement result.
Repeatability
The allowable error of double test results shall not exceed 0.1mm. A.2 Manual measurement method
A.2.1 Sample division
Perform according to A.1.3.1.
A.2.2 Determination
Perform according to the manual measurement method of GB/T24535. A.2.3 Result calculation
Perform according to A.1.4.
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Book number: 155066: 2-31864
LS/T6116-2017
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