SN/T 3896.8-2020 English PDFUS$239.00 · In stock
Delivery: <= 3 days. True-PDF full-copy in English will be manually translated and delivered via email. SN/T 3896.8-2020: (Import and export textiles-quantitative analysis of fibers-near infrared method - Part 8: Mixture of cotton and polyamide) Status: Valid
Basic dataStandard ID: SN/T 3896.8-2020 (SN/T3896.8-2020)Description (Translated English): (Import and export textiles-quantitative analysis of fibers-near infrared method - Part 8: Mixture of cotton and polyamide) Sector / Industry: Commodity Inspection Standard (Recommended) Classification of Chinese Standard: W04 Classification of International Standard: 59.080.01 Word Count Estimation: 11,193 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 3896.8-2020: (Import and export textiles-quantitative analysis of fibers-near infrared method - Part 8: Mixture of cotton and polyamide)---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. The People's Republic of China Entry-Exit Inspection and Quarantine Industry Standards 2020-08-27 release 2021-03-01 implementation Issued by the General Administration of Customs of the People's Republic of China Import and Export Textile Fiber Quantitative Analysis Near Infrared Method Part 8.Mixture of Cotton and Polyamide ForewordThe SN/T 3896 "Near Infrared Method for Quantitative Analysis of Import and Export Textile Fibers" includes 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 polyamide fiber; --Part 7.Mixture of polyester fiber and polyamide fiber; --Part 8.Mixture of cotton and polyamide fiber; This part is part 8 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. Zhongshan Customs, Nanchang Customs, Guangzhou Customs and Ganzhou Customs. The main drafters of this section. Wang Jingli, Gui Jiaxiang, Zhao Zhenyu, Zhang Xiaoli, Rao Min. Near-infrared method for quantitative analysis of import and export textile fibers Part 8.Blend of cotton and polyamide1 ScopeThis part of SN/T 3896 stipulates the principle, equipment, equipment, and equipment for the rapid determination of fiber content in cotton and polyamide mixtures by near infrared spectroscopy. Sample and environmental requirements, measurement procedures, result processing, test reports. This part is applicable to the rapid measurement of fiber content in cotton and polyamide fiber blended fabrics other than coated fabrics and pigment printing fabrics. It is determined that the cotton content of the sample is between 0% and 100%.2 Normative referencesThe 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 method3 Terms and definitionsThe 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 cotton and polyamide fiber is the identification model to determine whether the sample contains cotton and polyamide fiber. Cotton and polyamide The near-infrared quantitative model of the mixture of amine fiber, that is, the establishment of the near-infrared spectrum of the mixture of cotton and polyamide fiber using chemometric methods The mathematical relationship between the sample fiber content obtained by the standard method (GB/T 2910.1, GB/T 2910.7). 3.2 Homogeneous sample The sample of any organization structure composed of a blending ratio (except for the core-spun yarn) or the difference between multiple measured values at different points on the front and back No more than 3% of the samples, the others are non-homogeneous samples. 3.3 Monitor samples Homogeneous samples of the same species used to monitor the stability of the daily work of the near-infrared spectrometer. Note. This sample is an essential accessory for a near-infrared spectrometer equipped with a cotton/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 "35% cotton/65% polyamide fiber", "75% cotton/25% polyamide fiber".4 PrincipleThe 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 cotton and polyamide The standard method of measuring the fiber content of the fiber mixture and the calibration model between the near-infrared spectroscopy, so that through the calibration model, the measurement Test the fiber content of the blend of cotton and polyamide fiber.5 Equipment5.1 Near-infrared spectrometer. Fourier transform type near-infrared spectrometer or raster scanning type optical fiber spectrometer. 5.2 Sampling accessories. rapid determination of textile fibers equipped with photosensitive devices-near infrared spectroscopy sampling accessories (see appendix A), the device Set the mass to (1 500~1 700) g. Note. When using a Fourier transform near-infrared spectrometer for sample measurement, in order to determine the thickness of the sample to be tested, this sampling accessory should be used; This sampling accessory is not required when measuring samples with a tracing type optical fiber spectrometer.6 Sample and environmental requirements6.1 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 surface of the sample 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 a container of inorganic material 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. 6.2 Environment The temperature is 10 ℃~35 ℃, and the relative humidity is 30%~70%.7 Measurement procedure7.1 Instrument conditions 1)a 7.1.1 Conditions of different types of near-infrared spectrometers Since the test results are closely related to the instruments used, and there are many types of near-infrared spectrometers, it is impossible to give near-infrared light. 1) Non-commercial statement. 7.1.1.1 Fourier transform type near infrared spectrometer is Buqi NIRFlex N-500 near infrared spectrometer, 7.1.1.2 raster scan type The optical fiber spectrometer is a concentrated SupNIR-1100 portable near-infrared spectrometer. The test instruments listed here are only for reference and do not involve For commercial purposes, standard users are encouraged to try different manufacturers or different models of instruments. The general parameters of the spectrometer. A near-infrared spectrometer that meets the following instrument conditions has been proven to be suitable for testing. 7.1.1.1 Fourier transform near infrared spectrometer 7.1.1.1.1 Light source. tungsten lamp, wave number range 4 000 cm-1~10 000 cm-1. 7.1.1.1.2 Signal-to-noise ratio. 10 000.1. 7.1.1.1.3 Resolution. 8 cm-1. 7.1.1.1.4 Interferometer. TeO2 wedge polarization interferometer. 7.1.1.1.5 Detector. InGaAs sensor with temperature control. 7.1.1.1.6 If the model cotton/polyamide fiber near-infrared analysis model (see Appendix B.2.1) is successfully transferred, it needs to reach Appendix C.2.3 Requirements. 7.1.1.1.7 The instrument is equipped with special sampling accessories (see Appendix A) and monitoring samples. 7.1.1.2 Raster scanning fiber spectrometer 7.1.1.2.1 Light source. halogen tungsten lamp, wavelength range of 1000 nm to 1 800 nm. 7.1.1.2.2 Signal-to-noise ratio. 30 000.1. 7.1.1.2.3 Resolution. 10 nm. 7.1.1.2.4 Sampling spot diameter. greater than 30 mm. 7.1.1.2.5 Wavelength accuracy. better than 0.2 nm. 7.1.1.2.6 Wavelength stability. better than 0.02 nm. 7.1.1.2.7 Detector. InGaAs sensor with TEC temperature control. 7.1.1.2.8 If the model cotton/polyamide fiber near-infrared analysis model (see Appendix B.2.2) is successfully transferred, it needs to reach Appendix C.2.3 Requirements. 7.1.1.2.9 The instrument is equipped with monitoring samples. 7.1.2 Instrument preparation 7.1.2.1 Instrument warm-up More than 0.5 h. 7.1.2.2 Automatic test of instrument stability 7.1.2.2.1 Fourier transform near-infrared spectrometer. linear system, noise system, temperature system and wavelength accuracy system adaptability system Self-check. 7.1.2.2.2 Grating scanning optical fiber spectrometer. dark current noise, spectral capability, absorbance noise, absorbance and wavelength accuracy are automatic test. 7.2 Model monitoring Use the monitoring sample to determine the quantitative model, and the range of the multiple determination results of the cotton content of the same monitoring sample is not more than 3.0%, And the absolute error between the near-infrared measurement result and the cotton content marked on the monitoring sample is not more than 1.5%, then the cotton/polyamide fiber is quantitatively analyzed The model meets the test requirements. 7.3 Spectral collection 7.3.1 Fourier transform near infrared spectrometer Place the sample (6.1.2) in the detector window, and use the sampling accessory (5.2) to press the sample to achieve complete separation between the sample and the detector. Lamination, two parallel samples are selected at 3 different sampling points, and the near-infrared spectrum of the sample and the spectrum of the front and back of the fabric sample are collected All must be collected. When testing heterogeneous samples, attention should be paid to compacting the fiber fragments and keeping the optical path consistent with the testing of homogeneous samples. 7.3.2 Raster Scanning Optical Fiber Spectrometer Place the sample (6.1.2) in the detector window to ensure that the surface of the sample is flat and does not leak light. Two parallel samples are selected separately 3 different sampling points, the near-infrared spectrum of the collected sample, the spectrum of the front and back of the fabric sample must be collected, when testing heterogeneous samples Attention should be paid to compacting the fiber fragments and keeping the optical path consistent with the homogenized sample test. 7.4 Determination Select a cotton/polyamide fiber qualitative model (see Appendix B, B.3) to perform sample fiber formation on the spectra of two parallel samples collected If the average of the 6 predicted values is between 0.5 and 1.5, it can be judged that there are only cotton fibers and polyamides in the sample fiber. Otherwise, test the fiber composition of the sample according to FZ/T 01057, and confirm that there is only cotton fiber and polyamide in the sample Two components of fiber. Use the cotton/polyamide fiber quantitative model (see B.2) to carry out the spectral data of six different sampling points of two parallel samples Prediction, the predicted values of fiber content at 6 different sampling points are obtained, and the average of the 6 predicted values is the near-infrared prediction result of the sample. 7.4 Calculation of results Take the average fiber content of the sample as the test result. If one fiber content is the result of the spectrum test, the other fiber content The result is 100 minus the spectral detection result, and one decimal place is retained. Note. If the calibration model used is established and the reference value of the calibration set sample is the result of the public moisture regain, the model test result is the result of the public moisture regain. If the reference value of the calibration set sample is the dry quality result, the model test result is the dry quality result.8 Test reportThe test report should 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 during sample test; --The result of the sample measurement; --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; --Testers and test 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 Figure A.1 Rapid determination of textile fiber-schematic diagram of sampling accessory by near infrared spectroscopy Figure A.2 Rapid determination of textile fibers-schematic diagram of sampling accessories for near infrared spectroscopyAppendix B(Informative appendix) Cotton/polyamide fiber calibration model parameters B.1 Near-infrared spectrometer and technical parameters Fourier transform near-infrared spectrometer, light source is tungsten lamp, detector is Peltier cooled indium gallium arsenide detector, scanning range is (4 000~10 000) cm-1, the resolution is 8 cm-1, the number of scans is 32 times, the signal-to-noise ratio is 10 000.1, and the wavelength is accurate ±0.2 cm-1; Raster scanning optical fiber spectrometer, the spectral range (1 000~1 800) nm, the detector is an indium gallium arsenide detector, and the wavelength accuracy is ±0.2 nm, wavelength repeatability is ≤0.05 nm, resolution is 2 nm, scanning times is 10 times, with optical fiber. B.2 Quantitative model B.2.1 Quantitative model of Fourier transform near infrared spectrometer The near-infrared quantitative model of cotton/polyamide fiber is established by partial least square method. The specific parameters of the model are shown in Table B.1. table... ......Tips & Frequently Asked Questions:Question 1: How long will the true-PDF of SN/T 3896.8-2020_English be delivered?Answer: Upon your order, we will start to translate SN/T 3896.8-2020_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 3896.8-2020_English with my colleagues?Answer: Yes. The purchased PDF of SN/T 3896.8-2020_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. 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