This standard specifies the test method for determining the tensile elastic deformation and plastic deformation of knitted fabrics by the constant elongation and constant force method. This standard is applicable to all kinds of knitted fabrics. FZ/T 70006-2004 Test method for tensile elastic recovery rate of knitted fabrics FZ/T70006-2004 Standard download decompression password: www.bzxz.net

TC 55. 00. 01
Textile Industry Standard of the People's Republic of China
F77T700062004
Generation Fz99
Test method for elastic recovery of knitted fabrics in tension 2004-07-03 Issued
Implementation by National Development and Reform Commission of the People's Republic of China on 2004-11-01
z/73006—2004
This standard revise the test method for elastic recovery of knitted fabrics in tension, and this standard is F2r 7o0c6:399.
This standard is different from the original first-class standard atmosphere, which was changed from the second-class standard atmosphere to the second-class standard atmosphere, and set the requirements for the test path. The definition of terms is added;
… The standard specifies the specified force value, and the decision of repeated application is based on the original policy.
The revision of this standard, except for requirement B, is the current standard. This standard is proposed by China Textile Industry Association and exported by the Textile Branch of the National Standardization Technical Committee of Textiles. The unit promoting this standard is: China Knitwear Product Quality Supervision and Inspection Center. Xiaobiao Yafeng University, Gu Shidian, Zhang Lihui: The previous versions of this standard are as follows: Zw)11.FZ/6—_.
1 Standard
Test method for tensile elastic recovery of knitted fabrics FZ/T70006—2004
This standard specifies the test method for controlled elastic deformation and plastic deformation of knitted fabrics using a certain force and a certain length of opening: Standard promotes ten kinds of fabrics
2 Normative referenced documents
The clauses in the following text are referred to as the clauses of the standard through the technical standard. The hole is the same as the referenced document of the period, and all subsequent revisions do not include new versions for error tolerance. The following versions must not be seen: the number of references does not include new versions of these documents. The new versions of these documents are used for the same standard. The G2 standard is used for standard and certification. The following terms and definitions are placed in the technical standard. Elastic deformation refers to the deformation that can be recovered when the material is subjected to a large external force. For knitted fabrics, the elastic deformation is expressed by the recovery rate. 3.2 Plastic deformation refers to the deformation that cannot be recovered after the external force is removed under the specified conditions. The plastic deformation rate is used. 3.3
Constant elongation
Material tensile stress The constant elongation produced by the material under the actual control of the standard: 4 Principle
Use special instruments to pull the test specimens to change their uniformity, select the minimum value of the load, calculate the deformation of the typical parts and the deformation of the plastic parts,
5 Instruments and tools
5.1 The test instrument shall meet the following requirements (CRE type test method): 5.1.1 Clamping speed: 100mm1nm
5.1.2 The variable speed constant H fire 133mm.n, the speed is =01mm/min, the accuracy is 2 flow. 5.t, the value is large enough to set the difference does not exceed %. The maximum length does not exceed -. 5.1.4 Only the seat can be changed and the setting is warm and tight:
5.1.5 The light holding process of the special sample should prevent the sample from being pressed in the jaws when the sample is stretched. 5.1.6 Only the positive force is available to ensure the dynamic energy,
FZ/T 70006-2094
5.2 Shear, proof ruler (accurate to 1 cm), 5.1 The standard atmosphere for humidity adjustment and testing shall be the secondary atmosphere specified in BS52, 6.2 The product shall be placed in the humidifying atmosphere for moisture balance. Normally, the blended textile is low. Emulsified chemical fiber fabrics and test pieces are as follows: 7.1 The sample collar end is cut at 1.5: 7.2 The sample should be cut at more than 10 places on the edge of the cloth. The surface should be flat and there should be no color-affected test results. 7.3 The test period is required to be regular and daily. Each test sample is cut into 3 pieces in vertical and horizontal directions. The effective size of the test sample is 100mm. 7.4 The sample arrangement is in accordance with the force method given in the attached A. Generally, the B method (flat) is adopted. 8.1 Adjust the distance between the two optical devices and check that the jaws are accurately aligned and parallel to ensure that the force applied does not produce angular pressure deviation. 8.2 Determination of tensile force and elongation 8.2.1 Determination of elongation Put the two flat surfaces of the sample into the purple wheel holder, start the false device, apply a low tension of 1, and then stretch them to the effective elongation value (see Appendix B). The actual elongation value is 3 m, and the static automatic operation is set to record the tensile force value. The test result is expressed as the average short time G:T? Approximate to a decimal. 8.2.2 Determination of the elongation at constant force
Fix the two ends of the sample length evenly in the optical tester, start the positioner, apply a pre-tension of V, and when the set elongation is reached, the instrument automatically records the elongation. The test results are expressed as the average of the selected test data, and the standard B/T81 is corrected to one decimal place. Determined as the rate of elongation (1) -
Wuzhong:
The length after tension of the sample is the original length) (meter) 1: - tensile length, the unit is meter (mm
.3 Determination of tensile elastic elongation rate and plastic deformation rate 8.3.1 Determination of elastic elongation (rate) and plastic deformation rate 8.3.1.1 Determination of elastic elongation (rate) and plastic deformation rate 8.3.1.1 Determination of elongation (rate) ) Determination of elasticity and functional deformation rate during single tensile test -1)
Place the test length force to the selected length and fix it in the holding end. The dynamic instrument shall be implemented with a preset 1V rotation. When the product is pulled to a predetermined length, add 3m of tension. The test length shall be recorded during the dynamic test. The test results are expressed as the half mean of the final test data. Then BTR:70 is revised to the minimum effective point. 8.3.1.2 Determination of elasticity and functional deformation rate during single tensile test according to 8.1.1. The operation of 1.1 shall be repeated several times (see appendix). The last test length test result shall be recorded in the blank of 3 test data. 8.3.2 Determination of elastic recovery rate and plastic deformation under constant force tension 8.3.2.1 Determination of elastic recovery rate and plastic deformation rate under constant force tension Place both ends of the specimen in the length direction in a flat annealing device and start the exchanger to apply a pre-tension of 1 degree. When the pre-tension is reached, return to the starting point at a speed of 2. Stop for 3 minutes and record the change in length of the specimen. The test result is expressed as the average value of the test number of the three specimens tested. According to the standard of C3/T171, the value after the small increment is 1. 8.3.2.2 Determination of elastic recovery rate and plastic deformation rate under constant force tension 3.2.1 Select as the strength, the length of the crown after the number of times reached B), automatically record the length of the last sample, the test results are shown in the block certificate + the average value of the test number. According to H/70, the effective calculation is rounded to the decimal point. See formula (2) and formula 5)
tensile resilience rate
tensile deformation rate
[the length of the sample after the pre-tensioning (original length), the unit is millimeter (mm) L.
after the impact test and the pre-tensioning sample length (including the plastic deformation, the unit is millimeter [-1) after the tension (fixed length half or fixed force value) the total length of the sample changes, the unit is millimeter (mr:), t.
8.L stress relaxation determination
according to 3.2.1. The degree of injury is monitored by B. The tensile force is automatically recorded over time and expressed as the average value of the data from three samples. The stress relaxation rate is rounded to the nearest decimal place and is shown in formula (4):
1-T×100%
The stress relaxation rate is the force value when the sample is measured for a certain period of time, in Newton (N); the tensile force value is the value after a predetermined time, in Newton (N). The test report of the test shall include the following information:
standard number;
sample name and specification:
sample type, state, quantity,
test method adopted:
test equipment type:
test parameters of each test item (such as fixed length, fixed force, number of repeated extension tests and reduction time);
test direction:
test date:
any details of the test method.
F7/T 70006—2004
1.1 Method A
Step-shaped cutting methodwww.bzxz.net
1/1G Need to study
I——straight..
The direction,
Method B—Parallel loading method
1/1
Vertical direction!
Appendix 4
(Normative Appendix)
Sample cutting example
Figure A.1 Sample cutting example of the method
Figure A.2 Sample before parallel loading
Appendix B
(Normative Appendix)
Fixed length (rate), fixed force, reverse straight stretching times and relaxation stop timeF7/T 70006—20C4
B.1 Fixed elongation rate According to different varieties, the coil knitting direction or the core direction can be selected as 0%, U, and the tensile value of the core% can be selected. B.2 Fixed force According to different varieties, the coil knitting direction or the cross direction can be selected as 1N3iN, etc., and the number of repeated elongation (fixed elongation or fixed force is a table according to different varieties, the longitudinal direction or the cross direction can be selected as 1mi, 2mi, etc., and the number of repeated elongation can be selected as 3 times.
H.4 Relaxation time (fixed elongation or fixed force> According to different varieties, the longitudinal direction or the cross direction can be selected as 1mi, 2mi, etc.
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