This standard specifies the method for determining the tear strength of fabrics by the trapezoidal method. This standard is applicable to all kinds of woven fabrics and nonwoven fabrics. GB/T 3917.3-1997 Tear properties of textile fabrics Part 3: Determination of tear strength of trapezoidal test specimens GB/T3917.3-1997 Standard download decompression password: www.bzxz.net

ICs59.080-30
National Standard of the People's Republic of China
GB/T 3917.3—1997
cqISo9073-4:1989
Textiles
Tear properties of fabrics
Part 3.Determination of tear force oftrapezoidal sbaped test Speclmens1997-06-09 Issued
1997-12-01 ImplementationwwW.bzxz.Net
National Technical Supervision Bureau Issued
G1/3917.3-1597
This standard is equivalent to 1509073-4:1989 to modify the national standard GB3919~-83. Compared with the original G3918-83, the modified ones are as follows! 1. The tensile speed is 7mm/min. GB3918·83 uses 2mm/mm2. The test size uses the value in 1309073-4! 3. The results are expressed as the average value of a series of effective load peaks. When the instrument is not in use, the test station can be used for the maximum allowable bursting strength. The standard has been implemented since 3918-53. The tearing strength of fine textiles and paper products consists of three parts: Part 1: Determination of the bursting strength of tongue-shaped specimens by impact hammer method; Part 2: Determination of the bursting strength of tongue-shaped specimens; Part 1: Determination of the two-dimensional strength of tongue-shaped specimens. This standard was proposed by the Science and Technology Development Department of China Textile Federation. This standard is the Standardization Research Institute of China Textile Federation. The drafting unit of this standard is Shanghai Textile Science Research Institute. The main drafters of this standard are Mai Jiajun, Chen Jie, and Wu Lan. fR/T3917.3—1997
ISO Foreword
TSO (International Organization for Standardization) is an international alliance of national standard creation bodies (ISO) member groups. The work of formulating international standards is completed through 1S (1 Technical Committee Order). Each member group has the right to attend the committee established for the project if it is interested in a certain item: governmental and non-governmental international organizations related to ISO can also participate in the project work. ISO maintains overall cooperation with the International Electrotechnical Commission (IEC) in all electrotechnical standards. International standard drafts are adopted by technical committees and become national standards before being published by the ISO Council. The communication of standards requires approval. 13 The International Standard 1S0973-4.1989 was prepared by 1S0/TC38 Technical Committee for Textiles. IS>5C73 covers the following parts: Test methods for nonwoven fabrics: Part 1: Determination of thickness Part 2: Determination of elongation under controlled tensile strength Part 3: Determination of tear resistance. Part 4: Determination of tear resistance. Part 1: National Standard of the People's Republic of China Textiles Tear properties of fabrics Part 3: Determination of tear strength of shaped specimens Textites-Tear The standard specifies the method for determining the tactile strength of fabrics. The standard is applicable to various fabrics and non-woven fabrics. The reference standard is GB/T 3917. 3-:1997
eq159073-4:1969
Generation #GE3918-83
The provisions contained in the following standards constitute the provisions of this standard through reference in this standard. When this standard is published, the versions shown are valid. All standard groups will be subscribed. The parties who use this standard should explore the possibility of using the latest versions of the following standards. GB6329-8G Standard atmosphere for adjusting and testing products GBB170·87 Numerical interpretation rules
3 Principle
In the test form, use the two trapezoids on the test instrument carefully. Record the non-parallel progress, add continuous increasing force to the sample, make the tear thick sample width square grip, full determine the average maximum tear force, unit is Newton. 4 Equipment
4.t Strength testing machine: use constant continuous extension type (CRE> or constant rate of extension type (CRT), with some automatic recording of force. 4.2 The degree of error should be enough to select the degree of the whole sample. 4.3 Sample: see Figure 1.
National Technology Supervision and Administration Commission approved on June 9, 1997, implemented on December 1, 1997
5 Sampling
CB/T3917.3-1997
Figure 1 Trapezoidal sample cabinet
Place the sample according to the product technical conditions or the relevant parties. 6.1 Unless otherwise specified, five specimens are cut in the warp direction (intended direction) and the screen direction (screen direction). The specimens shall not be taken from the selected products. Unit: mm 6.2 Cut the specimens to a size of about 50 mm × 2301 mm, and use a template to make a cut on each specimen. 6.3 According to the standard atmosphere specified in GB6529, the preheating, crystal adjustment and test are carried out. The standard large machine with two wrinkles is used for the rescue test. . Test steps
7.1 Set the distance between the two chains to (25±1>rm, the thermal extension speed to 1(/min, select the appropriate load range, and the recovery breaking strength falls within the range of 11%~90% of the full scale.
7.2 Take the trapezoidal shape with non-parallel sides and hold the specimen lightly. The cut is located in the middle of the two iron staggered edges, keep the edges taut, and the long edges are in a folded state. .3 Start the instrument. If there is an automatic recorder, record the magnetic strength in Newton (N). If not Calculate the average of a series of peaks in the warp (longitudinal) and weft (lateral) directions for each sample on the recording paper, and then calculate the average and variation coefficient of the results of the five samples in the warp (lateral) and transverse (lateral) directions. Then use an electronic recorder to obtain the average tear strength of each test row. The average will give the maximum tear strength. In conclusion, if there is no need for electronic records, the strength of each sample can be read directly. In the absence of test results, the average value of the peak values ​​shall be used. The test report shall include the following contents: a) Product name and organizational specifications + CB/T3917.3-1997 b) Test results in the warp (simulated direction) and weft (error direction) (see Chapter 8) 1) Type of frame, quantity and clamping speed: d) Details of deviations from this standard
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