GB/T 3292-1997 Test method for unevenness of yarn in textiles - Capacitance method
Some standard content:
JCS_59.080.01
National Standard of the People's Republic of China
GB/T3292—1997
Textiles Testing method for unevenness of texlilestrands-Usiog capacitance testing 1997-09-15 Issued
National Technical Supervision Bureau
1998-07-01 Implemented
GB:T3292
This standard is a revision of GR5292-S2 electric yarn uniformity tester method for testing yarn uniformity using American Standard for Testing and Materials ASTMT1425-89. During the revision process, the working procedures and methods of different types of yarn uniformity testers used in China were considered. This standard continues the important technical content of the previous version of 2001, and has made new additions and revisions to the name of the standard, the arrangement of the key points and the expression of the results. From the date of entry into force, this standard replaces B3292-82. Appendix A of this standard is the standard appendix of the standard. Appendix B is the standard of the standard. This standard is proposed by the General Association and is under the jurisdiction of the Standardization Research Institute of the China Textile Industry Association. The supervisory unit of this standard is the National Textile Quality Supervision and Inspection Center. 1 Scope National Standard of the People's Republic of China Textiles-Testing method for unevenness of yarns-Capacitance method Textiles-Testing method for unevenness of yarns-Capacitance method ryulpeentGHT3292--1997
Generation (3292-82
The standard specifies the method of testing the flatness of short fiber strips of 4Tex~-0kcex by capacitive recording. The standard is applicable to the testing of the flatness of pure or blended short fiber yarns made of various spinning materials (cotton, wool, linen, chemical fiber, silk, etc.).
This standard is not applicable to the testing of the flatness of chemical fiber filaments and natural silk. 2 Reference standards
The following standards contain the provisions: The provisions of this standard are constituted by the use in this standard. When this standard is published, the versions shown are valid. All standards will be subscribed to use Parties using this standard should explore the possibility of using the latest versions of the following standards. GR6529-6 Standard for the adjustment and testing of textiles GB8170-87 Numerical rules for testing fibers
3 Definitions
This standard adopts the following definitions.
3.1 Strand
A fiber strip with a diameter much greater than its diameter and arranged in an orderly manner. It includes yarn, yarn, spun yarn, yarn, rope, etc. 3.2 Unevenness
The degree of unevenness in the thickness (cross-section, diameter, pile density, etc.) of a yarn in the length direction. This standard specifically applies the degree of unevenness in density. 3.3 Strand
The degree of unevenness in the thickness (cross-section, diameter, pile density, etc.) of a yarn in the length direction. This standard specifically applies the degree of unevenness in density. Coefficient of variation Cycoefficien:ofvariatianunerennessThe percentage of the standard deviation of the yarn roughness within the total test length to the mean yarn roughness. 3.4 Segment length is the basic unit of measurement for unevenness of the test strip. Segment length can be expressed as the length of the cut when the test strip is uneven. 3.5 The maximum length within the test strip is the total length of the test strip unevenness, 3.6 The mean coefficient of unevenness of the test strip is the cumulative coefficient of unevenness. 3.7DRdeviationrate The percentage of the total average of the absolute value of the linear density of each point in the length and the average linear density in the length to the average linear density in the total test length. 3.8Normal test ormltesr GA/3292-1997 The test state when the length of the segment of the yarn being tested is equal to the length of the electrode plate used to measure the yarn. 3.9Inert test The test state when the segment of the yarn being tested is not suppressed, the length of the electrode plate is equivalently extended by the bleeder, and the length of the segment of the yarn being tested can be selected and set within a certain range. 4 Principle
The electric test strip utilizes the self-piercing detection principle to test the dryness of the external environment. Its detector is a flat air tester composed of two parallel electrodes. When the same dielectric continuously passes through the capacitor, the rate of change of capacitance is linearly related to the rate of change of conductivity. Therefore, when the yarn passes through the electrode of the device continuously at a certain speed, the change of capacitance is converted into the change of capacitance. The electrical signal input by the detector can provide various results indicating the dryness characteristics of the yarn after circuit operation processing. 5 Weight
Various types of electric test strips are composed of at least the following parts. 5.1 The yarn on the rack and package can be unwound under the fixed tension knife, and the yarn can be lengthened or wound. 5.2 The detector includes an adjustable tensioner, an electro-permeation type yarn drawing device and a multi-pulling device that stretches the yarn at a certain speed through the test mother rack. 5.3 The controller controls the test process, completes the processing of the yarn under the test number, and obtains the scientific test analysis results for display or printing (coefficient of variation of yarn unevenness, number of multiple bottoms, harmonic diagram, uneven curvature diagram, etc.). 6 Sampling quantity and number of tests
6.7 According to the type of yarn image in each spinning process and the needs of test analysis, at least the following number of samples shall be randomly selected for testing. Sample: one piece of simple yarn or one piece of fine yarn, four coupons, take two each from the front and rear spindles of the roving frame,
6.2 Each merchant shall test it once, 6.3 The sampling quantity and test distribution may be regulated according to the needs. 7 Atmospheric properties
7.1 The test conditions shall be in accordance with the second grade standard of the temperate standard atmosphere in CB6529, that is, the main temperature is (20 ± 21 ° C, the relative humidity is 65 ± % and the sample is balanced for 2 hours. For large and tight sample rolls, if more than one test is required, the sample should be balanced for 4 hours. During the conditioning and testing process, the standard atmosphere should be kept constant until the test is completed. 7.2 The test mixture should be humidified in a hygroscopic state. If necessary, it can be pre-conditioned in accordance with GB5529. 7.3 Process 1 If the test room does not have the above conditions, the test can be carried out under the following temperature and humidity conditions after the sample reaches equilibrium. The average temperature during the test is 18-28°C, and the average relative intensity step is 50%-75%. At the same time, it should be ensured that the temperature change does not exceed 3°C within the above range, and the relative change does not exceed 0.5/min; the relative sensitivity change does not exceed 3% within the above range, and the relative sensitivity change rate does not exceed 0.25/in. Before the test, the instrument should be placed in the above stable environment for at least 5b. The acceptance and arbitration tests of protective products should be carried out in accordance with 1.1 and 7.2. 8. Setting the number of test coupons
8.1 Selection of CV or U value
Recommended value table system: as shown in the ticket The dryness of the raw material cannot be expressed by a value, but can also be expressed by a value. GB/T32921997
Note that when the strip is not taken, the V value can also be converted by the following formula 1-258.2. The selection of
The strip dryness does not include the numerical step. The length of the small segment is not related to the sampling length. Different instruments have different L value ranges. Generally, the minimum value in the range is selected, that is, the positive strip test particle is selected. At this time, L is equal to the electrical length of the wet disk.
Selection 1 should consider making the actual strip dryness value as close as possible to the total strip dryness. The strip dryness measured by sampling 250m of various strips is actually close to the strip dryness. When the total unevenness is greater than 250m, the strip length is not much higher than the specified value. When it is necessary to analyze the logarithmic width, filter function or other strip unevenness, the length should be appropriately increased. If it is necessary to analyze the periodic strip unevenness of a longer segment in the spectrum, it is recommended to select a sampling length of at least 2000m
L, which can be selected according to the needs of test analysis. The general maximum sampling length is shown in Appendix A (standard test length). 83 Material test time and strip unwinding speed selection
-Standard root sand system bearing capacity and test analysis needs to select test time and unwinding speed, see age B (standard test amount), the use of unwinding speed is as follows:
strip length: 2i m/mir.Or hu m/nini
Coarse style: 50m/min or 100m/min
Fine style. 20Um/min or 400m/min
Attention should be paid when selecting the washing speed:
A) Select the speed that makes the yarn not produce long expansion, h) When it is necessary to use the non-light line graph to analyze the non-hook, the speed ratio should be set as small as possible to facilitate the analysis of short periodic fluctuations in the curve graph.
8.4 Selection of detection range
To ensure the accuracy of the test results, the detection range should be selected according to the following regulations: Coarse yarn: ±25% or ±12.5% (when the measured coefficient of variation is less than 2.5%, use ±12.5); fine yarn: ±5% or ±25% (when the measured coefficient of variation is less than 5%, use ±25%); 8.5 Average adjustment
For instruments equipped with yarn average density indicating meters, the average value should be adjusted manually or automatically before testing, and it should be ensured that under the "test condition", when the initial range is ±10%, the meter indication does not exceed %. When testing, if the actual line needs to be used to contact the sample, and It is recommended to take the slow test as the standard for the average linear density change of each package in a month. B.6 Selection of yarn wave sensitivity range
Generally, it is selected as follows:
Fine part: -50%
Coarse part: →50%:
Cotton knots and fuzz): +25 (airflow: -2), or selected according to the regulations in the product standard or gear specification. 8.7 Selection of tension
The tension applied to the yarn strip should ensure that the movement of the yarn strip is smooth and the vibration is as small as possible. 9 Procedure
9.1 According to the method of the yarn dryness meter, regularly determine the dryness meter: 9.2 Select the number of each test according to the requirements of the test 3, 9.3 Adjust the polarizer without sample pregnancy point, that is, before each test, remove the yarn strip from the test volume. At the same time, pay attention to not It is necessary to take the concave sample from the package in advance,
GB/3292-1997
9.4 Perform the operation according to the specified procedures in the instruction manual of the instrument. 10 Representation and calculation of results
10.1 The test results of yarn dryness and non-hook mainly include the following indicators: V> value, yarn gum number, non-hook curve, bend diagram, sub-mean coefficient AF value, deviation rate DR value, variation length curve, etc. 10.2. The construction adopts the following conventional test result representation methods: Method 1. CV(), yarn defect number.
Method 2: force inspection, kilometer yarn number, non-hook curve diagram, spectrum diagram, 10.3 When testing a batch of test yarns, the C() value, the average number of kilometers of yarn number and the standard deviation (or variation coefficient) can be calculated: 10.4 Test results can be expressed according to Test according to the method specified in G88170, keep the number of dry sands as integers, and keep two decimal places for the rest. 11 Test report
Explain that the test is carried out according to this specification, and report the following: a) Sample material, size and quantity, if necessary, source of sample: h) Test environment conditions (temperature, humidity)
Instrument model:
Necessary test parameters such as yarn length, sampling length, etc.) CV() value, kappa number, average V() value of the sample, flat groove dry number, if necessary, calculate its standard deviation (or coefficient of variation)
Door light curve, port curve, variable length curve, etc. When reporting the curve, the drawing speed or yarn-drawing speed ratio must also be reported:
Other indicators that the user considers necessary!
h) Any details higher than this standard:
Maoxincheng Line
Ground temperature m/mir
Net temperature
25C --2 000
10K~000
43-25G
CB/T 3292~-1997
Appendix to pump A
Appendix to the standard
Recommended sampling length L, m)
Weak drive collection
Sectional specification test
50~:00
Appendix B
Part I test total
(Standard Model Appendix)
Determination time and speed friction consultation change
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