This standard specifies the determination method of grain strength and stretch height of leather. This standard is applicable to all types of leather. QB/T 2712-2005 Physical and mechanical tests for leather Determination of grain strength and stretch height: Spherical cracking test QB/T2712-2005 Standard download decompression password: www.bzxz.net

ICS 59.140
Classification number, Y45
Ticket number: 15764-2005
Light Industry Standard of the People's Republic of China
QB/T2712—2005
Replaces QB/T3812.71999
Physical and mechanical tests
Deterinination of distension and strength of grain-Ball burst test(ISO 3379: 1976. Lcather--Delcrmination of distension and stre1igth ofgrain-Ballbursttest,MOD)
2005-03-19 Issued
National Development and Reform Commission of the People's Republic of China Implemented on September 1, 2005
QB/T2712-2005
Wood standard ruler for QB3R12.71999 Determination of single grain strength and secondary development height Period burst test 3 Revision of the design. This standard adopts 1S03379:1976. Determination of grain strength and extension height - Spherical aggregation test (Lcathr Thetemination of dispersion of nong tof grain - Rallbruret test), which is based on the International Union of Chemical Engineers and Chemical Engineers (IULTCS) standard HIP9: According to my country's actual situation, this standard has made the following technical modifications when adopting T503379:1976: In addition, the explicit "Note" in the standard letter: In the "Normative reference documents", the original referenced standards are included as references to relevant Chinese standards, and necessary reference standards are added - According to my country's standards: The 5 sample part has been corrected and divided into 5.1, 5.2, and 5.3 for easy use. - The requirements for calculation results have been added in "Expression of results". The following editorial changes have been made to facilitate the use of this standard: the prefix of TSO standard "this international standard" has been deleted, and the prefix "this standard" has been changed to "this standard". The decimal point "" has been replaced by the decimal point "". Compared with QB/T3812.7-1999, the main changes of this standard are as follows: - "Normative reference documents" has been added, and "Preparation of sampling and test rods" has been added. This standard is proposed by China Automobile Industry Federation. This standard is issued by the National Standardization Technical Committee of Automobile Industry (SAC/TC252). The drafter of this standard is: Li Guo.
" Semi-standard" was first issued in October 1984 as the original national standard GB/4689.7-1984, and was converted into the light industry standard QB3812.7-1999 in April 1999. The date of implementation of this standard is as follows: This standard replaces the original light industry standard QBT3812.7-1999 issued by the national light industry at the same time. Pre-test for the determination of grain and texture of leather 3.
1 Scope
Leather physical and mechanical tests
Determination of grain strength and extension height: Ball cracking test This standard specifies the method for determining the grain strength and extension height of leather: This standard is applicable to various types of leather (light leather) 2 Normative references
QB/T2712—2005
The following clauses become clauses of this standard through the use of this standard: For all references with a date of note, all subsequent amendments (excluding errors) or revisions are not applicable to this standard. However, the parties to this standard are encouraged to use the latest versions of these documents. For all references with a date of note, the latest versions are applicable to this standard. QB/T2706-2005 Chemical, physical, mechanical and color test material collection (ISO2418: 2002, MOD) QB/T2707-2005 Preparation and adjustment of physical and mechanical test specimens (ISO2419: 2002M0) 3 Principle
"A steel sample is loaded on the central part of the flesh of a deformable sample, and the sample is fixed with a fixture. The stopping force and extension height are recorded when the grain cracks and cracks occur respectively. 4 Installation The clamping device shall only include the following components (see Figure 1, Figure 2 and Figure 7.2): 4.1 First, circle the periphery of the shaped specimen so that the middle part of the specimen can move. When the middle part of the specimen is stretched, the part of the specimen clamped by the fixture shall remain stationary to ensure that the clamped part of the specimen will not move during the test. The part to be worked and the moving part shall have a clear boundary. The active part of the specimen accounts for 25.0mm. 4.2 Second, circle the periphery of the shaped specimen so that the middle part of the specimen can move. When the middle part of the specimen is stretched, the part of the specimen clamped by the fixture shall remain stationary to ensure that the clamped part of the specimen will not move during the test. The part to be worked and the moving part shall have a clear boundary. The active part of the specimen accounts for 25.0mm. The rod of the ball, which cannot rotate, acts on the center of the sample surface, and the force is measured by the measuring device. The relative movement of the ball and the clamp produces a speed of <12±2) mm/n. The diameter of the ball is 6.25m. When the sample cracks and breaks, the error of the measured value does not exceed 3%. 4.3 The device for measuring the height of the sample, all the instruments are calibrated, accurate to 0.1mm, and the error within the range does not exceed 0.05mm. The height of the test piece can be measured by comparing the optical tool with the pot ball. Calculate the distance moved: the direction of the steel ball moving is perpendicular to the surface of the sample being tested. When the steel ball touches the inner surface of the sample, the displayed value of the force is zero, which is used as the starting point of the relative movement of the steel ball. The reduction in the buoyancy of the sample due to the force of the steel ball can be ignored. QB/T2712-2005
Moon cut surface of the sample placed
±0.025mpm
Figure 2 Dimensions of the K part on the fixture
5 Sampling and test preparation
5. 1. The sample is tested in accordance with the specification of QB/T2706-2005. 5.2. The sound control of the sample is carried out in accordance with the specification of Figure 3 of Q277-2005. 5.3. The air conditioning of the sample is carried out in accordance with the specification of QB2*07-2005. 6.1. The Wuxiang leveling and evenly evening fire person is guided by the teaching instrument after the air conditioning sound is changed, the grain mountain is upward, the meat mountain can be spherical, 6.2. mm/e stretching speed or the like stretching, note that the high number of grains and cracks produced by the observation of the surface production cattle decay pulse recording method using the different products 71), the development of the original parts, if the enterprise sent to the beat instrument can withstand the value of the broadcast before the board, the flash force value of the business waste.
7 Notes
7 The city of the machine should be calibrated regularly, the sample center period oil meter record each other point surface line no difference, you should not be effective part of the cost of control
12 winter 1 Figure 2 only and the product crack other parts of the currency method. Figure 3 is the details of the collection of this document. The basic requirements of the instrument have been donated in Chapters 4 and 5. The most important part of the product is the top of the selection. 7.3 If the reading decreases during the test, this is because the grain has been broken as soon as possible. The reading of the zero value should be verified by the person who has signed the minimum value. This error can be accepted, but it cannot be used for service readings. Obviously, it is better to take the reading as the source.
8 Representation of results
8.1 If the sample is cracked, the value of the maximum value of the grain crack H should be calculated. QB/T2712—2005
B.2 If the sample is not broken, the average extension height and the extension degree of the maximum force applied should be recorded, and it should be stated that the sample has no source carbon.
Note: If several specimens are tested at the same time, the overall report of each specimen (not the average) shall be included in the test report.
The test report should include the following contents:
This standard, bZxz.net
Sample name, number, type:
Detailed information on the sample, sampling conditions if inconsistent with Q/T2706-2005: Test conditions (standard air: 20/65% or 23/50%): Test results (crack height, test strength) If the sample is not whole-grain wood, the test results should be described in detail, as well as the differences between the actual operation and the wood standard.
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