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SN/T 3896.7-2020 English PDF

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SN/T 3896.7-2020: (Import and export textiles-fiber quantitative analysis near infrared method - Part 7: Mixture of polyester fiber and polyamide fiber)
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SN/T 3896.7-2020	English	259	Add to Cart	3 days [Need to translate]	(Import and export textiles-fiber quantitative analysis near infrared method - Part 7: Mixture of polyester fiber and polyamide fiber)	Valid	SN/T 3896.7-2020

PDF similar to SN/T 3896.7-2020

Standard similar to SN/T 3896.7-2020

GB/T 16604 GB/T 14464 GB/T 13758 SN/T 3896.8 SN/T 3896.6 SN/T 3896.2

Basic data

Standard ID	SN/T 3896.7-2020 (SN/T3896.7-2020)
Description (Translated English)	(Import and export textiles-fiber quantitative analysis near infrared method - Part 7: Mixture of polyester fiber and polyamide fiber)
Sector / Industry	Commodity Inspection Standard (Recommended)
Classification of Chinese Standard	W52
Classification of International Standard	59.080.30
Word Count Estimation	12,162
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 3896.7-2020: (Import and export textiles-fiber quantitative analysis near infrared method - Part 7: Mixture of polyester fiber and polyamide fiber)

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Quantitative analysis of fiber in textiles for import and export- Near-infrared spectroscopy method- Part 7.Mixture of polyester fiber and polyamide fiber The People's Republic of China Entry-Exit Inspection and Quarantine Industry Standards Near-infrared method for quantitative analysis of import and export textile fibers 2020-08-27 release 2021-03-01 implementation Issued by the General Administration of Customs of the People's Republic of China

Foreword

SN/T 3896 "Near Infrared Method for Quantitative Analysis of Import and Export Textile Fibers" is a series of standards, divided into the following parts. --Part 1.The mixture of polyester fiber and cotton; --Part 2.The mixture of polyester fiber and polyurethane elastic fiber; --Part 3.The mixture of polyamide fiber and polyurethane elastic fiber; --Part 4.The mixture of cotton and polyurethane elastic fiber; --Part 5.Mixture of polyester fiber and viscose fiber; --Part 6.Mixture of polyester fiber and wool fiber; --Part 7.Mixture of polyester fiber and polyamide fiber; --Part 8.Blend of cotton and polyamide fiber. This part is part 7 of SN/T 3896. This part was drafted in accordance with the rules given in GB/T 1.1-2009. This part is proposed and managed by the General Administration of Customs of the People's Republic of China. Drafting organizations of this section. Nanchang Customs of the People's Republic of China, Jiangxi Infrared Spectroscopy Application Engineering Technology Research Center. The main drafters of this section. Gui Jiaxiang, Geng Xiang, Zhou Liping, Rao Min. Near-infrared method for quantitative analysis of import and export textile fibers

1 Scope

This part of SN/T 3896 specifies the method for rapid determination of the fiber content of polyester fiber and polyamide fiber mixture by near infrared spectroscopy. Method, the instrument and equipment requirements, sample and environmental requirements, and determination of the mixture of polyester fiber and polyamide fiber by near-infrared spectroscopy are given. Steps, result processing and measurement report requirements. This part is applicable to the rapid determination of the fiber content of the mixture of polyester fiber and polyamide fiber other than the pile fabric. The content of polyester fiber ranges from 10.0% to 90.0%.

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 2910.1 Textile Quantitative Chemical Analysis Part 1.General Test Rules GB/T 2910.7 Quantitative Chemical Analysis of Textiles Part 7.Mixture of Polyamide Fiber and Certain Other Fibers (Formic Acid Method) FZ/T 01057 (all parts) Textile fiber identification test method

3 Terms and definitions

The following terms and definitions apply to this document. 3.1 Calibration model The mathematical model of the relationship between the near-infrared spectrum of the sample and the corresponding chemical standard value established by the chemometric method, the calibration model Including qualitative models and quantitative models. The qualitative model is based on a large amount of information and data, based on expert experience and existing knowledge, Use the methods of computer and mathematical reasoning to complete the process of automatic identification and evaluation of shapes, patterns, curves, numbers and graphics; quantification The model is a mathematical relationship established between the concentration of a substance (or other physical and chemical properties) and the response value of the analytical instrument. Note. The near-infrared qualitative model of the mixture of polyester fiber and polyamide fiber is the identification model to determine whether the sample contains polyester fiber and polyamide fiber. type. The near-infrared quantitative model of the mixture of polyester fiber and polyamide fiber, that is, the use of near-infrared spectroscopy and stoichiometric methods to establish a model with polyamide fiber The mathematical relationship between the near-infrared spectrum of a mixture of polyester fibers and the fiber content of the sample obtained by the standard method (GB/T 2910.1, GB/T 2910.7). 3.2 Homogeneous sample Refers to a sample with a range of no more than 3% between multiple measurements. 3.3 Monitor samples Uniform samples of the same species used to monitor the stability of the near-infrared analyzer in daily work. Note. This sample is a necessary accessory for a near-infrared instrument equipped with a polyester fiber/polyamide fiber near-infrared analysis model. 3.4 Identification of fiber content The nominal value of the fiber content percentage of the textile to be tested, such as "15% polyester fiber/85% polyamide fiber" and "75% polyester fiber Dimension/25% polyamide fiber".

4 Principle

The near-infrared spectrum of textiles reflects the chemical properties of CH, OH, CO, etc. in textile fiber molecules after textiles absorb near-infrared light. The over-frequency vibration or rotation of the bond reflects the absorption characteristics of the near-infrared light of the textile; the chemometric method is used to establish the relationship between the polyester fiber and the The calibration model between the determination result of the fiber content of the polyamide fiber mixture and its near-infrared spectrum is passed through the calibration model. Type to determine the fiber content of the mixture of polyester fiber and polyamide fiber.

5 Equipment

5.1 Near-infrared spectrometer Fourier transform type near infrared spectrometer or raster scanning type fiber spectrometer. 5.2 Sampling accessories Rapid determination of textile fiber equipped with photosensitive device-near infrared spectroscopy sampling accessory (see appendix A), the quality of the device is (1 500~1 700) g. Note. When using a Fourier transform near-infrared spectrometer for sample measurement, this sampling accessory should be used to determine the thickness of the sample to be tested; use raster scanning It is not necessary to use this sampling accessory when the type fiber optic spectrometer is used for sample measurement.

6 Sample and environmental requirements

6.1 Sample preparation 6.1.1 Sample classification Divided into two types of homogeneous samples and non-homogeneous samples. 6.1.2 Sample preparation For homogeneous samples, several layers can be folded to ensure that the sample surface is flat and can be tested directly. For non-homogeneous samples, first crush the sample to fragments less than 1.5 mm, and then put it in an inorganic material container and press it. To ensure that the surface of the fiber cake is flat, make a sample with a thickness greater than 3 mm and a diameter greater than the diameter of the detection probe. The size of the sample is greater than 20 cm×30 cm, the fiber composition of the sample is evenly distributed, the surface is flat, and there is no non-fibrous impurities. 6.2 Environment Temperature 10 ℃ ~35 ℃, relative humidity 30%~70%.

7 Measurement procedure

7.1 Instrument conditions 1) 7.1.1 Conditions of different types of near-infrared spectrometers Since the measurement result is closely related to the instrument used, and there are many types of near-infrared spectroscopy instruments, it is impossible to give the near-infrared spectroscopy General parameters of spectroscopic instruments. A near-infrared spectrometer that meets the following instrument conditions has been proved to be suitable for the measurement. 7.1.1.1 Fourier transform near infrared spectrometer. a) Light source. tungsten lamp, wavelength range of 1 000nm ~ 2 500nm; b) Signal-to-noise ratio. 10 000.1; c) Resolution. 8 cm-1; d) Interferometer. TeO2 wedge polarization interferometer; e) Ambient temperature. 5 ℃ ~35 ℃, temperature-controlled InGaAs detector; f) Ambient humidity. when the temperature is less than 31 ℃, the relative humidity is less than 80%; g) If the model polyester fiber/polyamide fiber near-infrared analysis model (see B.2.1 in Appendix B) is successfully transferred, it should reach The requirements of Appendix C.2.3; h) The instrument is equipped with special sampling accessories (see Appendix A) and monitoring samples. 7.1.1.2 Raster scanning fiber spectrometer. a) Light source. halogen tungsten lamp, wavelength range of 1 000nm ~ 1 800nm; b) Signal-to-noise ratio. 30 000.1; c) Resolution. 10nm; d) Sampling spot diameter. greater than 30 mm; e) Wavelength accuracy. better than 0.2 nm; f) Wavelength stability. better than 0.02 nm; g) Ambient temperature. 5 ℃ ~35 ℃; h) Ambient humidity. 5%~85% RH; i) Detector. InGaAs sensor with TEC temperature control; j) If the model polyester fiber/polyamide fiber near-infrared analysis model (see B.2.2 in Appendix B) is successfully transferred, it should reach The requirements of Appendix C.2.3; k) The instrument is equipped with monitoring samples. 7.1.2 Instrument preparation 7.1.2.1 Preheating of the instrument. 0.5 h or more. 7.1.2.2 The stability of the instrument is automatically determined. Fourier transform near-infrared spectrometer. linear system, noise system, temperature system and wavelength accuracy system adaptability system Self-check Raster scanning optical fiber spectrometer. dark current noise, spectral capability, absorbance noise, absorbance and wavelength accuracy are automatic Determination. 1) Non-commercial statement. 7.1.1 a) The Fourier transform type near infrared spectrometer is Buqi NIRFlex N-500 near infrared spectrometer, 7.1.1 b) The raster scanning type optical fiber spectrometer is Concentrator SupNIR-1100 portable near-infrared spectrometer. The test instruments listed here are only for reference and do not involve commercial purposes. Standard users are encouraged to try Try to use different manufacturers or different models of instruments. 7.2 Model determination Use the monitoring sample to determine the running status of the model. The results of multiple determinations of the polyester fiber content of the same monitoring sample are extremely poor Not more than 3.0%, and the absolute error between the near-infrared measurement result and the polyester fiber content marked on the monitoring sample is not more than 1.5%, then the polyester The fiber/polyamide fiber quantitative analysis model meets the test requirements. 7.3 Spectral collection Fourier transform near-infrared spectrometer. Fold the sample in half and place it in the detector window, use the sampling accessory (5.2) to press the sample, Realize the complete fit between the sample and the detector, and adjust the thickness of the sample until the sampling accessory does not alarm. Two parallel samples are separately Select 3 different sampling points on the front and back to collect the near-infrared spectrum of the sample. Raster scanning optical fiber spectrometer. Fold the sample twice and place it in the detector window to ensure that the surface of the sample is flat. For the parallel samples, 3 different sampling points were selected on the front and back sides to collect the near-infrared spectra of the samples. 7.4 Determination Select a qualitative model of polyester fiber/polyamide fiber (see B.3 in Appendix B) to sample the spectra of two parallel samples collected Fiber composition judgment, if the average of the 6 predicted values is between 0.5 and 1.5, it can be judged that there is only polyester fiber in the sample And polyamide fiber. Otherwise, perform fiber component test on the sample according to FZ/T 01057 (all parts) to confirm the presence and There are only two components, polyester fiber and polyamide fiber. Use the polyester fiber/polyamide fiber quantitative model (see Appendix B in B.2) to measure the light of 6 different sampling points of two parallel samples. Spectral data is used for prediction, and the predicted value of fiber content at 6 different sampling points is obtained. The average of the 6 predicted values is the near-infrared value of the sample. forecast result. 7.5 Results processing and presentation 7.5.1 Suspected sample 2) The measurement result has a range greater than 3.0% or the absolute error between the final measurement result of the sample to be tested and the fiber content label is greater than 2.0%, should Analyze and eliminate the cause of abnormal measurement results, and then perform a second near-infrared measurement to confirm. If abnormalities still occur, If it is confirmed as a suspected sample, GB/T 2910.1 and GB/T 2910.7 are directly used for confirmatory determination. 7.5.2 Normal sample If the prediction result range is equal to or less than 3.0% and the absolute error between the final measurement result of the sample to be tested and the fiber content label is less than 2.0%, the average value of the measurement results is taken as the measurement result of the fiber content of the sample.

8 Measurement report

The measurement report shall include but not limited to. --The name and number of the calibration model; --The scope of use of the calibration model; --Instrument model; -The name and number of the sample; --Ambient temperature and humidity when the sample is measured; --The result of the sample measurement; 2) The reason for the formation of a suspected sample may come from the following aspects. ①The sample is not included in the scope of application of the calibration model of the instrument; ②The wrong calibration model is used Type; ③The temperature and humidity exceed the specified range of the calibration model. --Using the determination method standard; - When there is a suspected sample, the type of the suspected sample and relevant information about its handling shall be provided; --Measurement personnel and measurement time; -All details that are not specified in this section, or deviate from this section, and may affect the measurement results.

Appendix A

(Normative appendix) Fast determination of textile fiber--principle of sampling accessory by near infrared spectroscopy and schematic diagram of accessory See Figure A.1 and Figure A.2. B.1 Near-infrared spectrometer and technical parameters Fourier transform near-infrared spectrometer, light source is tungsten lamp, detecting...

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