Path:
Home >
SN/T >
Page29 > SN/T 5239-2020
Price & Delivery
US$199.00 · In stock · Download in 9 secondsSN/T 5239-2020: (Import and export textiles, quantitative fiber analysis, microprojector method, kapok/cotton blended products)
Delivery: 9 seconds. True-PDF full-copy in English & invoice will be downloaded + auto-delivered via email. See
step-by-step procedureStatus: Valid
| Std ID | Version | USD | Buy | Deliver [PDF] in | Title (Description) |
| SN/T 5239-2020 | English | 199 |
Add to Cart
|
3 days [Need to translate]
|
(Import and export textiles, quantitative fiber analysis, microprojector method, kapok/cotton blended products)
|
Click to Preview a similar PDF
Basic data
| Standard ID | SN/T 5239-2020 (SN/T5239-2020) |
| Description (Translated English) | (Import and export textiles, quantitative fiber analysis, microprojector method, kapok/cotton blended products) |
| Sector / Industry | Commodity Inspection Standard (Recommended) |
| Classification of Chinese Standard | W04 |
| Classification of International Standard | 59.080.01 |
| Word Count Estimation | 9,994 |
| 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 5239-2020: (Import and export textiles, quantitative fiber analysis, microprojector method, kapok/cotton blended products)
---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.
Textile for Import and Export-Quantitative analysis by projection microscope
Method- Mixtures of kapok and cotton
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
Foreword
This standard was drafted in accordance with the rules given in GB/T 1.1-2009.
Please note that some of the contents of this document may involve patents. Publication of this document
The agency is not responsible for identifying these patents.
This standard was proposed and managed by the General Administration of Customs of the People's Republic of China.
Drafting organizations of this standard. Guangzhou Customs of the People's Republic of China, Jiangmen Customs of the People's Republic of China.
The main drafters of this standard. Lan Lili, Lu Hanping, Jiang Xiaoliang, Xie Fei, Chen Qiong, Xie Maozhong, Huang Haimin, Zhang Xiaoli.
Quantitative analysis of import and export textile fibers
Microprojector method kapok/cotton blended products
1 Scope
This standard specifies test methods for the quantitative analysis of kapok and cotton blended products by using a microscope projector or a digital image analyzer.
This standard applies to the quantitative analysis of kapok and cotton blended products.
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 8170 Numerical rounding rules and the expression and determination of limit values
FZ/T 01057.3 Textile fiber identification test method Part 3.Microscopic method
3 Principle
This method uses a micro-projector or digital image analyzer to distinguish and count a certain number of fibers, and a micro-projector or digital image analyzer
The font image analyzer measures the diameter of the fiber and calculates the mass percentage of various fibers.
4 Reagents
Unless otherwise specified, all reagents are chemically pure.
4.1 Distilled water or deionized water.
4.2 Anhydrous glycerin or liquid paraffin.
5 Apparatus and equipment
5.1 Micro projector; magnification 500 times and above.
5.2 Digital image analyzer.
5.3 Fiber slicer.
5.4 Slide, cover glass, watch glass.
5.5 Oven. It can keep the temperature at 105 ℃ ± 3 ℃.
5.6 Wedge ruler. printed with 500 times magnification scale.
6 Sample steps
6.1 Qualitative analysis of the test
The cotton fiber shall be implemented in accordance with FZ/T 01057.3, and the kapok fiber morphological characteristics are shown in Appendix A.
6.2 Sampling
6.2.1 Yarn
At least 10 bobbins or 5 bobbins (skeins) are randomly selected from laboratory samples to form a sample, and then from each bobbin
Or take a 15 cm length of yarn sample from the tube (skein) yarn and combine it into a bunch.
6.2.2 Fabric
At least one piece of 10 cm×10 cm fabric is randomly selected from the laboratory samples and disassembled into yarns (the samples with sizing need to be pre-processed first)
After processing, disassemble into yarn), 10 cm long section, a total of 30 sections are randomly taken out and combined into one bundle. Woven fabrics are used as warp and weft fibers
When the dimension content is different, the disassembled warp and weft should be dried and weighed in an oven (5.5) respectively, and the fiber weight of each component of the warp and weft should be measured separately
Percentage content, and then calculate the mass percentage content of each component fiber in the entire fabric. The sample should be cut more than 10 cm away from the edge of the sample cloth, and the cloth is required
The surface is flat, and there must be no defects that affect the test results.
6.3 Pretreatment
The fabrics that should be pretreated shall be pretreated in accordance with the provisions of GB/T 2910.1.
6.4 Preparation of fiber longitudinal glass slide
Use the fiber slicer (5.3) to cut the above sample (6.2) evenly to cut off the 0.2 mm~0.36 mm long fiber bundle, and move it to the surface glass
In the dish, add a certain amount of anhydrous glycerin (4.2) or liquid paraffin (4.2) and mix well to form a dense suspension. Use a straw to draw
Put a small amount of the evenly mixed suspension on the glass slide, spread it out evenly, cover the cover glass to fix the sample, take care not to let the fibers flow out
Cover the outside of the cover glass to avoid fiber loss, otherwise the glass slide needs to be re-prepared.
6.5 Counting the number of fibers
Use a microscope projector (5.1) to observe the fibers. The slides prepared according to 6.4 are placed on the stage of the microscope projector.
Observe the various types of fibers that enter the field of view through the eyepieces, and identify their types according to the morphological and structural characteristics of the fibers (see Appendix A). From approaching
Start counting at the top or bottom corner of the field of view. When the slide moves slowly across the field of view in the horizontal direction, recognition and counting pass the target
Mirror all fibers in the center of the reticle. After each stroke across the field of view, move the slide vertically 1 mm~2 mm and then
Slowly move across the field of view in the horizontal direction, identify and count the fibers, and repeat this procedure until all the slides have been read.
The total count should be more than 1,000.If the number of pieces on the slide is more than 1,000, it can’t be interrupted.
The count within the range is completed; if there are less than 1,000 slides in the entire range, another slide must be made to make the total number of fibers reach
More than 1,000 roots. Each batch of samples counts two groups of more than 1,000 fibers, and calculates the converted number of each fiber in the two groups of fibers (refer to
See appendix B), the difference between the converted number of each fiber in the two tests is not more than 10.
6.6 Determination of fiber diameter
6.6.1 Calibrate the fiber projector
Make it magnify up to 500 times on the projection plane, and then place the glass slide prepared according to 6.4 on the stage to make the measurement
The fibers are all within the projection circle. Adjust the fine adjustment of the projector so that the edge of the fiber image is projected onto the wedge ruler (5.6) like a thin line.
Measure the projected width in the middle of the fiber length as the diameter. Avoid measuring those fibers whose measuring points are at the intersection of two fibers and those whose measuring points are shorter than 150
For μm fibers, more than.200 fibers must be measured for each type of fiber. Calculate the average diameter of each fiber after the measurement, the unit is μm
Logo.
The projection of cotton fiber will have uneven thickness. If the average value of the fiber segment cannot be automatically measured, it must be within one twisting cycle of the cotton fiber.
Take the average value of the projection width at three points as the result of the diameter of this fiber. The three points are the widest, narrowest and two
At the midpoint of the distance.
When the kapok fiber is twisted and deformed, the width of the parallel straight section of the fiber should be taken as the fiber diameter.
6.6.2 Digital image analyzer (5.2)
The same applies to this method, and the test is carried out in accordance with the instrument manual when using.
7 Calculation
Measure the average diameter of the fiber according to 6.6, and use the fiber density (see Appendix C) to calculate the mass percentage of each fiber, see formula (1)~
8 Test results
The test results are expressed as the average of the two tests. If the difference between the results of the two tests is greater than 2%, the third test should be carried out.
The test results are expressed as the average of three tests.
The test result shall be rounded to one decimal place according to GB/T 8170.
9 Test report
Should include but not limited to.
a) Number of this standard;
b) Sample number, name and specification;
c) Use instrument model;
d) Test date and test personnel;
e) The mass percentage content of each component fiber in the sample;
f) Some details that deviate from the standard.
Appendix A
(Informative appendix)
Morphological characteristics of cotton and kapok fibers
The morphological characteristics of cotton fibers are shown in Table A.1, and the pictures are shown in FZ/T 01053.3; the morphological characteristics of kapok fibers are shown in Table A.1, and the pictures are shown in Figure A.1.
And Figure A.2.
Appendix B
(Informative appendix)
B.1 The converted number of roots is to use a counter to directly record the number of each fiber and then convert it into the number of each fiber in 1,000 fibers.
The calculation of the converted root number is shown in formulas (B.1) and (B.2).
B.2 When calculating kapok and cotton fibers, you must be able to count the number of individual fibers when you find bundled fibers (that is, fibers that are not completely dispersed).
Otherwise, it is considered that the production has failed.
Appendix C
...
