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GB/T 3917.2-2009 (GB/T3917.2-2009)

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GB/T 3917.2-2009: PDF in English (GBT 3917.2-2009)

GB/T 3917.2-2009
Textile - Tear properties of fabrics - Part 2. Determination of tear force of trouser-shaped test specimens (Single tear method)
ICS 59.080.30
W04
National Standards of People's Republic of China
GB/T 3917.2-2009/ISO 13937-2.2000
Replace GB/T 3917.2-1997
Textile fabric tearing performance
Part 2. Pants sample (single seam)
Determination of tear strength
(ISO 13937-2.2000, IDT)
Released on.2009-03-19
2010-01-01 implementation
General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China
China National Standardization Administration issued
Foreword
GB/T 3917 "Tattoo Performance of Textile Fabrics" includes the following five parts.
--- Part 1. Determination of the tearing strength of the impact pendulum method;
---Part 2. Determination of the tear strength of the pants sample (single seam);
---Part 3. Determination of tear strength of trapezoidal specimens;
--- Part 4. Determination of tear strength of tongue specimens (double seams);
--- Part 5. Determination of tear strength of wing specimens (single seams).
This part is the second part of GB/T 3917.
This section uses the translation method equivalent to ISO 13937-2.2000 "Textile fabric tearing performance Part 2. Pants sample (single
Sewing) Determination of tear strength (English version).
This section is equivalent to ISO 13937-2.2004, which has the following differences compared to ISO 13937-2.2004.
--- Removed the preface to international standards;
--- Removed the note in Chapter 1;
--- The normative reference documents replaced the corresponding international standards by Chinese standards;
--- Added Figure B. 1 and Figure C. 1 picture title.
This part replaces GB/T 3917.2-1997 "Tearing properties of textile fabrics - Part 2. Determination of tear strength of tongue-shaped specimens"
Single tongue method. The main differences between this part and GB/T 3917.2-1997 single tongue method are.
--- Increased the scope of inapplicability;
--- Normative references increase the standard for instrument debugging;
--- Added a note of 3.2 to supplement the test of the effective clamping line;
--- Added a note of 3.3;
--- Added a note of 3.4 to illustrate the method of selecting the effective peak;
--- Added the specific standard for instrument commissioning in 6.1 General;
---The width of the clamp is modified from at least 50mm to 75mm;
---Added a wide sample with a width of.200mm and its operation method;
--- Increased the ratio of the paper feed rate of the recording paper in 9.4 to the elongation rate of the instrument is 2.1;
--- Edited changes to 10.1.1, and deleted note 2;
--- Increased the calculation of the maximum peak average of 6 samples per sample;
--- Appendix C adds an approximate calculation method for peak selection.
Appendix D of this section is a normative appendix. Appendix A, Appendix B, and Appendix C are informative annexes.
This part was proposed by the China Textile Industry Association.
This part is under the jurisdiction of the Basic Standards Branch of the National Textile Standardization Technical Committee (SAC/TC209/SC1).
This section is mainly drafted by. Suzhou Fiber Inspection Institute, China Textile Standard (Beijing) Inspection and Certification Center Co., Ltd.
The main drafters of this section. Hang Zhiwei, Wang Ning, Wang Huan, Wang Haijuan, and Jing Jing.
The previous versions of the standards replaced by this section are.
---GB/T 3917-1983, GB/T 3917.2-1997.
GB/T 3917.2-2009/ISO 13937-2.2000
Textile fabric tearing performance
Part 2. Determination of tear strength of pants-shaped specimens (single seams)
1 range
This part of GB/T 3917 specifies a method for determining the tear strength of a fabric using a single slit pant sample method. In the direction of tearing strength
The force required to tear the fabric from the initial single slit slit to the specified length is measured.
This section is mainly applicable to woven fabrics, and can also be applied to fabrics made by other technical methods, such as non-woven fabrics.
This section does not apply to knitted fabrics, woven elastic fabrics, and sparse fabrics that have the potential to cause tear transfer and have higher anisotropy.
Fabric.
This section specifies the use of a constant velocity elongation (CRE) tester.
2 Normative references
The terms in the following documents become the provisions of this part by reference to this part of GB/T 3917. Quotations with dated
And all subsequent amendments (not including errata content) or revisions do not apply to this section, however, it is encouraged to
The parties to the discussion use the latest version of these documents. For undated references, the latest edition applies to this section.
GB/T 6529 Standard atmosphere for textile conditioning and testing (GB/T 6529-2008, ISO 139.2005, MOD)
GB/T 16825.1 Inspection of static single-axis testing machines - Part 1 . Examination and calibration of force measuring systems for tension and/or pressure testing machines
Standard (GB/T 16825.1-2008, ISO 7500-1..2004, IDT)
GB/T 19022 Measurement management system measurement process and measurement equipment requirements (GB/T 19022-2003, ISO 10012.
2003, IDT)
3 Terms and definitions
The following terms and definitions apply to this part of GB/T 3917.
3.1
Throughout the test, one clamp was fixed and the other clamp was used as a tensile tester for constant speed motion.
3.2
The distance between the two effective clamping lines on the test device.
Note. The effective clamping line of the chuck can be measured by simultaneously clamping the sample specimen and the carbon paper to which the pre-tension is applied.
3.3
The force required to expand the initial incision on the specimen under specified conditions.
Note. The warp yarn is torn off, which is called “warp tear strength”, and the weft yarn is torn off, which is called “weft tear strength”.
3.4
On the force-elongation curve, the slope corresponds to the corresponding strong value at the negative point.
Note. The value of the rise and fall forces at both ends of the peak used for the calculation is at least 10% of the previous peak drop value or the next peak rise value.
3.5
The distance from which the incision extends from the beginning of the application to the termination.
GB/T 3917.2-2009/ISO 13937-2.2000
3.6
The cut length is cut from the center of the short side of the rectangular sample to form a two-legged fabric tear test specimen for clamping. (See Figure 1
And Figure 2)
4 Principle
The legs of the trousers are gripped so that the sample slit line is in line between the upper and lower clamps. Actuate the instrument to apply tension to the direction of the incision.
Record the tear strength up to the specified length and measure the peak on the curve according to the automatic drawing device or by electronic device
Calculate the tear strength.
5 sampling
Sampling according to product standards or according to relevant agreements.
In the absence of the above requirements, Appendix A gives an example of a suitable sampling.
Appendix B is an example of cutting a sample from a sample. Be careful to avoid wrinkles, hem, and areas of fabric that are not representative.
6 instruments
6.1 Measurement of the tester
Should be carried out according to GB/T 19022.
6.2 Constant Velocity Elongation (CRE) Tester
The constant velocity elongation tester shall meet the following technical requirements.
a) The stretching speed can be controlled within the range of (100 ± 10) mm/min;
b) The length of the gauge can be set to (100 ± 1) mm;
c) able to record the tear strength during the tearing process;
d) Under the conditions of use, the instrument shall be in accordance with the accuracy requirements of GB/T 16825.1, displayed or recorded at any point within the scope of use of the instrument.
The maximum tear strength error shall not exceed ±1%, and the displayed or recorded fixture spacing error shall not exceed ±1mm;
e) If the strength and elongation records are obtained through data acquisition chips and software, the frequency of data acquisition should be at least 8 times/s.
If a secondary tensile tester is used, it should be noted in the report.
6.3 clamping device
The center point of the two fixtures of the instrument shall be in the stretching line, the end line of the fixture shall be at right angles to the stretching line, and the clamping surfaces shall be in the same plane.
The fixture shall be capable of holding the specimen without slipping it or cutting or damaging the specimen.
The effective width of the fixture is preferably 75 mm, but should not be less than the width of the test specimen.
6.4 Cutting device
Preferably, the device used is a cutter or a template that can cut the sample as shown in FIG.
7 humidity control and test atmosphere
Pre-conditioning, humidity control and test atmosphere are carried out according to GB/T 6529.
8 Preparation of samples
8.1 General
Two samples were taken from each sample, one for the warp direction and the other for the weft direction.
Note. Samples outside the woven fabric are given names with corresponding names, such as portrait and landscape.
Each set of specimens should have at least 5 specimens or more by agreement. According to Chapter 5 and Appendix B, every two samples cannot contain
GB/T 3917.2-2009/ISO 13937-2.2000
Yarn in the same length or width direction. It is not possible to sample within 150 mm from the edge of the cloth.
8.2 Sample size
The sample (see Figure 1) is a rectangular strip with a length of (200 ± 2) mm and a width of (50 ± 1) mm. Each specimen should be cut from the center of the width direction.
It is a (100 ± 1) mm slit parallel to the length direction. The end of the tear is marked at the uncut end (25 ± 1) mm of the strip in the strip.
The unit is mm
1---Tear end point;
2---Incision.
Figure 1 pants sample size
According to the agreement of the parties concerned, it is possible to test with a wide sample of.200 mm width. When a narrow sample is not suitable (see 9.4) or measured
Wide-width specimens are recommended for the tear strength of special tear-resistant fabrics, and the use of wide-width specimens for the determination of tear strength is described in Appendix D.
method.
8.3 Sample cutting
For the woven fabric, each sample is cut parallel to the warp or weft direction of the fabric as a long side. The long side of the sample parallel to the warp sample is "weft"
To "Tear the specimen, the specimen with the long side of the specimen parallel to the weft direction is a "warp" tear specimen (see 3.3 and Appendix B).
9 steps
9.1 Gauge length setting
The gauge length of the tensile tester was set to 100 mm.
9.2 Stretch rate setting
The tensile rate of the tensile tester was set to 100 mm/min.
9.3 Installation sample
Each leg of the sample is clamped into a fixture, the cutting line is aligned with the center line of the clamp, and the uncut end of the sample is free.
State, the clamping state of the entire sample is shown in Figure 2. Care is taken to ensure that each leg is fixed in the fixture so that the tear is started parallel to the slit and
In the direction in which the tearing force is applied. The test does not require pre-tensioning.
GB/T 3917.2-2009/ISO 13937-2.2000
1---fixture.
Figure 2 clamping of the sample
9.4 Operation
The instrument was started and the sample was continuously torn to the end mark of the sample at a tensile rate of 100 mm/min.
Record the tear strength (N). If you want to get the tear path of the sample, record each test with a recorder or an electronic recording device (6.2).
The tear length and tear curve in the direction of each fabric.
If it is from the peak of high-density fabric, it should be taken by hand. The ratio of the paper feed rate to the stretch rate of the recording paper should be set to 2.1.
Observe whether the tearing is in the direction of the applied force and whether there is a yarn slipping from the fabric rather than being torn. Meet the following
The test of the piece is an effective test.
a) the yarn does not slip from the fabric;
b) the specimen has not slipped from the fixture;
c) The tear is complete and the tear is made along the direction of the force applied.
Test results that do not meet the above conditions should be excluded.
If the test results of 3 or more of the 5 samples are rejected, the method is considered to be unsuitable for the sample.
If the agreement increases the number of samples, it is best to double the number of samples, and should also report the test results.
When a narrow specimen is not suitable or the tear strength of a special tear resistant fabric is measured, the use of wide specimens to measure tearing is described in Appendix D.
Breaking the powerful method.
Note. If both narrow and wide specimens do not meet the test requirements, other methods such as double gap tongue test or wing test may be considered.
Sample method.
10 Calculation and representation of results
Specify two calculation methods. manual calculation and electronic calculation. The two methods may not get the same calculation results, different methods
The test results obtained are not comparable.
10.1 Manually calculate the tear strength from the strength-elongation curve recorded on the recording paper
An example of calculation is given in Appendix C.
10.1.1 Divide the peak curve from the first peak to the end of the final peak into four regions (see Appendix C). The first area is gone
Use, the remaining three regions each region select and mark the two highest peaks and two lowest peaks. The value of the lift force at both ends of the peak used for the calculation and
The drop force value is at least 10% of the previous peak drop value or the next peak rise value.
10.1.2 Calculate the arithmetic mean of the 12 peaks of each sample based on the peak value of 10.1.1, in Newtons (N).
Note. Manual calculations can only take a limited number of peaks to calculate time to save time. It is recommended to calculate all peaks electronically.
GB/T 3917.2-2009/ISO 13937-2.2000
10.1.3 Calculate the total arithmetic mean of the tear strength of the sample in the same direction based on the arithmetic mean of the peak values of each sample (see 10.1.2).
Newton (N) stated that two significant figures were retained.
10.1.4 If necessary, calculate the coefficient of variation to the nearest 0.1%; and calculate the 95% confidence interval (N) from the sample mean, retaining two
The effect number, the average value is calculated according to 10.1.2.
10.1.5 If necessary, calculate the average of the six largest peaks per sample, in Newtons (N).
10.1.6 Record the maximum and minimum peaks (very poor) of each sample, if needed.
10.2 Calculation by electronic device
An example of calculation is given in Appendix C.
10.2.1 Divide the first peak and the last peak into four regions (see Appendix C), round off the first region and record the remaining three
All peaks within a region. The rising force value and the falling force value at both ends of the peak used for the calculation are at least the previous peak falling value or the next peak
10% of the rise.
10.2.2 Calculate the arithmetic mean of the tear strength of the specimen in all the peaks recorded in 10.2.1, in Newtons (N).
10.2.3 Calculate the total arithmetic mean of the tear strength of all samples in the same direction, using the average of each sample (see 10.2.2).
Dun (N) said that two significant figures are reserved.
10.2.4 If necessary, calculate the coefficient of variation to the nearest 0.1%; and calculate the 95% confidence interval (N) from the sample mean, leaving two
Effectiveness figures, the average is calculated according to 10.2.2.
11 test report
The test report should include the following.
11.1 General Information
a) the numbering and test date of this part of GB/T 3917;
b) sample specifications, if necessary, the sampling procedure;
c) the number of samples, the number of test results and the reasons for rejection;
d) abnormal tearing;
e) the average value calculated manually (see 10.1) or electronic device (see 10.2);
f) Any deviation from the details of this section, especially when using wide specimens.
11.2 Test results
a) The total average of the tearing strength in the warp and weft directions, in Newtons (N). If only three or four specimens are normally torn
The test results of each sample shall be separately indicated;
b) give the coefficient of variation (%) if needed;
c) If necessary, give a 95% confidence interval in Newtons (N);
d) When calculating manually (see 10.1), the average value of the maximum peak value of each sample (see 10.1.5) can be given as needed, in Newtons.
(N);
e) When calculating manually (see 10.1), the minimum and maximum peaks of each sample (see 10.1.6) can be given as needed, in Newtons
(N).
GB/T 3917.2-2009/ISO 13937-2.2000
Appendix A
(informative appendix)
Recommended sampling procedure
A. 1 Batch sample (number of samples taken from one shipment or batch of goods)
As shown in Table A. Take the appropriate amount of samples randomly from one shipment or one shipment. Should ensure that there are no damage marks or shipments in the sample
Destructive damage during the transfer.
Table A. 1 batch sample
Minimum number of samples for one shipment or batch of goods
≤3 1
4~10 2
11~30 3
31~75 4
≥76 5
A. 2 Number of laboratory samples
From each batch of samples, a full-length fabric with a length of at least 1 m is randomly cut at least 3 m from the end of the sample as a laboratory.
Samples should be guaranteed to have no wrinkles or visible defects.
GB/T 3917.2-2009/ISO 13937-2.2000
Appendix B
(informative appendix)
Cutting sample samples from laboratory samples
The unit is mm
1---cloth edge;
2---"weft" tearing specimen;
3---"warp direction" tearing specimen;
4---warp direction.
Figure B. 1 Cut a sample from a laboratory sample
GB/T 3917.2-2009/ISO 13937-2.2000
Appendix C
(informative appendix)
Tear strength calculation example
1---Tear strength;
2--- tear direction (record length);
3---the intermediate peak approximate range;
4---to go to the area;
5---first area;
6---the second area;
7---3rd area;
8---Tear end point.
Figure C. 1 tear strength calculation example
Approximate calculation of peak values (see 3.4)
In order to simplify the manual calculation, it is recommended to approximate the peak strength change value based on the peak value of the intermediate height of the sample tear curve. use
1/10 of the intermediate height peak, that is, about ±10% to determine whether a peak is suitable for calculation, the peak rise and fall stages
The strong value needs to reach 1/10 of the intermediate height peak, which is about ±10%.
E.g.
Intermediate height peak 85N ~ 90N (approximate)
10% of this value 8.5N~9N
The peak value that can be used to calculate the rise and fall of the peak value >8N
GB/T 3917.2-2009/ISO 13937-2.2000
Appendix D
(normative appendix)
Wide pants
D. 1 General
a) According to the requirements of 9.4, the yarn is slipped from the fabric rather than being torn when it is torn, the tear is not complete or the tear is not along the force
The direction of the sample shall be rejected. If the test results of three or more of the five samples are rejected,
This method is considered to be unsuitable for this sample. In this case it is recommended to use a wide panty sample (see Figure D.1) for testing.
b) for the determination of the tear strength of certain special tear resistant fabrics, such as loose fabrics, crack resistant fabrics and for technical applications
The rayon tear-resistant fabric (coating or airbag), the above mentioned standards are not applicable. Recommended in this case
A wide panty sample (see Figure D.1) was tested. Other width ranges can also be selected depending on the agreement of the party concerned.
The unit is mm
1---Tear end point;
2---Incision.
Figure D. 1 wide pants sample
D. 2 procedures
Each leg for gripping is folded inwardly from the outside and directed inwardly so that the nip width of each leg is half the width of the kerf
(See Figure D.2).
All other test conditions are consistent with the provisions of this section, but the clamp width is at least half the width of the specimen.
The calculation of all peaks for special tear resistant fabrics should be consistent with 10.2. Specially designed tear-resistant fabrics may form a different
Often the tear trajectory, which is usually the property of these fabrics. It is recommended to record according to the relevant agreement, which contains the tear trajectory of the specimen.
GB/T 3917.2-2009/ISO 13937-2.2000
1---folded edge.
Figure D. 2 sample clamping diagram
GB/T 3917.2-2009/ISO 13937-2.2000
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