HOME   Cart(8)   Quotation   About-Us Policy PDFs Standard-List
www.ChineseStandard.net Database: 189759 (19 Oct 2025)

SN/T 5233-2020 English PDF

US$219.00 · In stock
Delivery: <= 3 days. True-PDF full-copy in English will be manually translated and delivered via email.
SN/T 5233-2020: (Import and export textile raw materials, determination of moisture regain of raw cotton, near infrared spectroscopy)
Status: Valid
Standard IDContents [version]USDSTEP2[PDF] delivered inStandard Title (Description)StatusPDF
SN/T 5233-2020English219 Add to Cart 3 days [Need to translate] (Import and export textile raw materials, determination of moisture regain of raw cotton, near infrared spectroscopy) Valid SN/T 5233-2020

PDF similar to SN/T 5233-2020


Standard similar to SN/T 5233-2020

GB/T 6097   FZ/T 10007   FZ/T 01085   SN/T 5616.1   SN/T 5430   SN/T 5050.1   

Basic data

Standard ID SN/T 5233-2020 (SN/T5233-2020)
Description (Translated English) (Import and export textile raw materials, determination of moisture regain of raw cotton, near infrared spectroscopy)
Sector / Industry Commodity Inspection Standard (Recommended)
Classification of Chinese Standard W10
Classification of International Standard 59.060.10
Word Count Estimation 10,188
Date of Issue 2020-08-27
Date of Implementation 2021-03-01
Regulation (derived from) General Administration of Customs Announcement No. 98 [2020]
Issuing agency(ies) General Administration of Customs

SN/T 5233-2020: (Import and export textile raw materials, determination of moisture regain of raw cotton, near infrared spectroscopy)


---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
Import and export textile material-Test of moisture regain of raw cotton-Near-infrared spectroscopy method The People's Republic of China Entry-Exit Inspection and Quarantine Industry Standards Near infrared spectroscopy 2020-08-27 release 2021-03-01 implementation Issued by the General Administration of Customs of the People's Republic of China

Foreword

This standard was drafted in accordance with the rules given in GB/T 1.1-2009. This standard was proposed and managed by the General Administration of Customs of the People's Republic of China. Drafting organization of this standard. Nanjing Customs of People's Republic of China. The main drafters of this standard. Wu Lina, Cao Xizhong, Wu Mengbi, Dong Shaowei, Jiang Yanna, Zhou Yuhang, Tao Jing. Determination of the moisture regain of raw cotton for import and export textile raw materials Near infrared spectroscopy

1 Scope

This standard specifies the test method for rapid determination of moisture regain of raw cotton by near infrared spectroscopy. This standard applies to raw cotton with a moisture regain in the range of 6% to 15% after the seed cotton is processed by a sawtooth gin or a top roller gin.

2 Normative references

The following documents are indispensable for the application of this document. For dated reference documents, only the dated version applies to this article Pieces. For undated reference documents, the latest version (including all amendments) is applicable to this document. GB/T 6102.1 Test method for moisture regain of raw cotton Oven method SN/T 3702.2 Sampling method for quality conformity evaluation of import and export textiles Part 2.Textile raw materials

3 Terms and definitions

The following terms and definitions apply to this document. 3.1 Quantitative model A mathematical model of the relationship between the near-infrared spectrum of the sample and the concentration of the corresponding substance established by the method of chemometrics. 3.2 Monitor samples A uniform and stable sample of the same variety used to monitor the stability of the daily work of the near-infrared analyzer.

4 Principle

In the near-infrared region, water molecules have a very characteristic combined frequency absorption band, and near-infrared spectroscopy can be used to determine the water content in a substance. Using the chemometric method, establish a mathematical model between the oven method test results of the raw cotton moisture regain and its near-infrared spectrum, that is, the quantitative model type. Through the quantitative model, quickly determine the moisture regain of raw cotton.

5 Equipment and materials

5.1 Near-infrared spectrometer Fourier transform type near infrared spectrometer or raster scanning type fiber spectrometer. Note. Fourier transform near infrared spectroscopy needs to be equipped with a sample rotating device and a sampling bottle. The sampling bottle is made of quartz. 5.2 Monitoring samples The monitoring sample of Fourier transform infrared spectroscopy is a raw cotton sample with a known moisture regain value, sealed in the same specification and material as the sampling bottle Can be used for monitoring; the monitoring sample of the raster scanning fiber spectrometer is a raw cotton sample with a known moisture regain value, sealed in quartz In a flat-bottomed container made of material, the bottom area of the container should be larger than the sampling spot, which can be used for monitoring.

6 Measurement procedure

6.1 Fourier transform near infrared spectroscopy 6.1.1 Instrument conditions Because the test results are closely related to the instruments used, and there are many types of near-infrared spectroscopy instruments, it is impossible to give near-infrared spectroscopy. General parameters of spectrometers. Near-infrared spectrometers that meet the following instrument conditions have been proven to be suitable for testing. a) Light source. halogen tungsten lamp, wavelength range of 4 000 cm-1~10 000 cm-1; b) Signal-to-noise ratio. 10 000.1; c) Resolution. 8 cm-1; d) Detector. InGaAs sensor with temperature control; e) If the near-infrared analysis model of the moisture regain of raw cotton is successfully transmitted, it should meet the requirements of A.2.3 in Appendix A, see B.2.1 in Appendix B. 6.1.2 Instrument preparation As follows. a) Preheating of the instrument. more than 0.5 h; b) Instrument stability automatic test. linear system, noise system, temperature system and wavelength accuracy system adaptability system self-test. 6.1.3 Extraction of samples Sampling shall be carried out according to the sampling method for moisture regain inspection specified in SN/T 3702.2.The sampling volume is not less than 50 g. 6.1.4 Model monitoring Use the monitoring sample to determine the NIR spectroscopy analysis model, and the maximum deviation of the multiple measurement results of the same monitoring sample is not big It is less than 1.0%, and the absolute error between the near-infrared measurement result and the moisture regain content of the raw cotton marked on the monitoring sample is not more than 0.5%. 6.1.5 Determination In order to avoid errors caused by uneven samples, three samples of raw cotton were collected on the front side, the back side, and the inner layer. Raw cotton Place the sample in the sampling bottle, compress the sample with a metal accessory with a flat surface, place the sampling bottle on the rotating device, and take the flat surface that rotates once. The average spectrum is used as the spectrum data for one measurement. Take care to avoid weeds and foreign fibers when sampling. Take the average value of the spectrum of 3 parts and calculate the result according to the quantitative model of raw cotton moisture regain (see Appendix B, B.2.1). each Each sample is tested twice. 6.2 Raster scanning optical fiber spectroscopy 6.2.1 Instrument conditions Because the test results are closely related to the instruments used, and there are many types of near-infrared spectroscopy instruments, it is impossible to give near-infrared spectroscopy. General parameters of spectrometers. Near-infrared spectrometers that meet the following instrument conditions have been proven to be suitable for testing. a) Light source. halogen tungsten lamp, wavelength range of 1 000 nm to 1 800 nm; b) Signal-to-noise ratio. 30 000.1; c) Resolution. 10 nm; d) Wavelength accuracy. better than 0.2 nm; e) Wavelength stability. better than 0.02 nm; f) InGaAs sensor with temperature control; f) If the near-infrared analysis model of the moisture regain of raw cotton is successfully transmitted, it should meet the requirements of A.2.3 in Appendix A, see B.2.2 in Appendix B. 6.2.2 Instrument preparation As follows. a) Preheating of the instrument. more than 0.5 h; b) Automatic test of instrument stability. automatic test of dark current noise, spectral capability, absorbance noise, absorbance and wavelength accuracy. 6.2.3 Extraction of samples Sampling shall be carried out according to the sampling method for moisture regain inspection specified in SN/T 3702.2.The sampling volume is not less than 50 g. 6.2.4 Model monitoring Use the monitoring sample to determine the NIR spectroscopy analysis model, and the maximum deviation of the multiple measurement results of the same monitoring sample is not big It is less than 1.0%, and the absolute error between the near-infrared measurement result and the moisture regain content of the raw cotton marked on the monitoring sample is not more than 0.5%. 6.2.5 Determination After the raw cotton sample is combed and leveled, it is placed tightly in the detector window of the near-infrared spectrometer. Ensure that the surface of the sample to be tested is flat during testing And does not leak light. In order to ensure the tightness of the sample, an inorganic substance, such as a steel plate, can be placed on the back of the sample. The window of the device fits tightly and flatly together. Take care to avoid weeds and foreign fibers when sampling. In order to avoid errors caused by uneven samples, the spectrum data of three different parts of the front, back, and inner layer are collected separately. Take 3 The average value of the spectrum of the part is calculated according to the quantitative model of the moisture regain of raw cotton (see B.2.2 in Appendix B). Each sample test 2 times.

7 Processing and presentation of results

7.1 Normal sample The absolute difference between the two prediction results obtained under repeatability conditions does not exceed 0.5%, and the two prediction results of the sample to be tested are within If it is between 6% and 15%, the average value of the two measurement results shall be taken as the moisture content of the sample. The calculation result retains 2 significant digits. 7.2 Abnormal samples The absolute difference between the two prediction results obtained under repeatability conditions exceeds 0.5%, or the two prediction results of the sample to be tested are less than 6% Or more than 15%, the cause of the abnormal measurement result should be analyzed and eliminated, and the near-infrared measurement should be performed again to confirm, such as If the abnormal situation still occurs, it is confirmed as an abnormal sample, and the sample shall be directly confirmed and determined by the method of GB/T 6102.1.

8 Test report

The test report should include (but not limited to). -The name and number of the quantitative model; --The applicable moisture regain range of the quantitative model; --Instrument model; -The name and number of the sample; --Ambient temperature and relative humidity during sample test; --The result of the sample measurement; --Using the determination method standard; --Testers and test time; - When an abnormal sample occurs, relevant information on the type and handling of the abnormal sample should be provided; --All the details that are not specified in this standard, or considered to be non-mandatory, and that may affect the measurement results.

Appendix A

(Normative appendix) Quantitative model and delivery requirements A.1 Accuracy and precision of the model A.1.1 Accuracy Verify that the absolute difference between the measured value of the raw cotton moisture regain of the sample set and the reference value is not more than 1.0%, and the statistical analysis results are not significant Sexual differences. Use GB/T 6102.1 to obtain the reference value of raw cotton moisture regain. A.1.2 Repeatability In the same laboratory, the same operator uses the same instrument and equipment, according to the same test method, on the same sample under test. Test independently, and the absolute difference between the two measurement results obtained is not more than 0.5%. A.1.3 Reproducibility In different laboratories, different operators use different equipment, according to the same test method, for the same sample, two unique The absolute difference between the measurement results is not more than 1.0%. A.2 Delivery and evaluation of the model A.2.1 Quantitative model transfer samples Select multiple uniform raw cotton products as the calibration model to transfer samples (usually 10 to 20), and use the near-infrared model to transfer the model Submit samples for prediction, and the measurement results meet the requirements of A.4. A.2.2 Quantitative model delivery By controlling the manufacturing precision to maintain consistency between different near-infrared spectroscopy instruments, or by mathematical methods to adjust the spectrum or calibration model The process of correcting, so that the calibration model established on the near-infrared host can be effectively used on the near-infrared sub-machine, is called the calibration model. Type delivery. Note. The near-infrared spectroscopy instrument used to build the model is called the host, and the other near-infrared spectroscopy instruments to be transferred are called slaves. A.2.3 Evaluation of quantitative model delivery The accuracy and precision of the qualitative model on the transferred NIR sub-machine should meet the following requirements. a) Accuracy. The standard deviation between the measured value of the raw cotton moisture regain on the near-infrared sub-machine and the reference value is not more than 1.0%, statistical analysis There is no significant difference in the results; b) Repeatability. In the same laboratory, the same operator uses the same near-infrared sub-machine, according to the test method specified in this standard, Test the same sample twice independently, and the absolute difference between the two moisture regain measurement results obtained is not more than 0.5%; c) Reproducibility. In different laboratories, different operators use the near-infrared sub-machine and the host according to the same test method to compare...

Tips & Frequently Asked Questions:

Question 1: How long will the true-PDF of SN/T 5233-2020_English be delivered?

Answer: Upon your order, we will start to translate SN/T 5233-2020_English as soon as possible, and keep you informed of the progress. The lead time is typically 1 ~ 3 working days. The lengthier the document the longer the lead time.

Question 2: Can I share the purchased PDF of SN/T 5233-2020_English with my colleagues?

Answer: Yes. The purchased PDF of SN/T 5233-2020_English will be deemed to be sold to your employer/organization who actually pays for it, including your colleagues and your employer's intranet.

Question 3: Does the price include tax/VAT?

Answer: Yes. Our tax invoice, downloaded/delivered in 9 seconds, includes all tax/VAT and complies with 100+ countries' tax regulations (tax exempted in 100+ countries) -- See Avoidance of Double Taxation Agreements (DTAs): List of DTAs signed between Singapore and 100+ countries

Question 4: Do you accept my currency other than USD?

Answer: Yes. If you need your currency to be printed on the invoice, please write an email to [email protected]. In 2 working-hours, we will create a special link for you to pay in any currencies. Otherwise, follow the normal steps: Add to Cart -- Checkout -- Select your currency to pay.