Digital Elmendorf Tearing Tester Principle and Maintenance Essentials

The digital Elmendorf tearing instrument is mainly used for the determination of the tear strength of various woven fabrics (Elmendorf method) for the detection of textile, woven fabrics, nonwovens, coated fabric impact tear strength, Can also be used for silk, cotton, all kinds of paper, cardboard and single and multi-layer corrugated board resistance to breaking strength test.
digital fabric elmendorf tearing strength tester Tearing mechanism In this paper, we discuss the tear breaking process of the fabric by the single-slit method [2], which is discussed along the weft tearing of the fabric and the warp fracture. In the single seam method tear, the formation of a ripple at the force of the triangle. When the weft of the force in the sample is gradually separated up and down, the warp yarns that are not directly stressed begin to slide relative to the wefts of the force and move closer together to form an approximate triangular area. At the bottom of the tearing mouth, the warp yarns in the triangular forces bear the tensile force, in which the first warp of the triangular bottom is the largest force, and the other warp threads are weakened by a certain load level. The sliding is limited due to the frictional resistance between the yarns. In the sliding, the yarn tension increases rapidly, deformation elongation also increased dramatically. When the first warp yarns forming the triangular bottom of the force are deformed to the elongation at break, the warp yarns are broken and the mechanical state of the second warp is immediately converted to the state before the first warp is broken. One by one to break continuously, forming a knife-like fracture surface.
Falling-pendulum fabric tearing strength elmendorf tester Maintenance Note:1. Each time you start and start a new set of tests, press the reset button to restart the instrument, otherwise the data is not processed correctly. The same time as2. When the instrument is reset and the zero key is pressed, it contains the function of automatically clearing (peeling) the force sensor. Please note that there is no additional force attached to the gripper in addition to its own weight when starting the instrument. , Peeled not allowed, will lead to the test is not accurate. The same time as3. Instrument input setting parameters, should be carried out before the start of a group of tests, otherwise, will lead to data processing error. The same time as4. The instrument has been calibrated before the strong test, non-professional inspection and maintenance personnel, shall not be arbitrarily calibrated, otherwise the instrument will force inaccurate. The same time as5. Wait for the test and calibration display state, the force sensor can be cleared, after pressing the zero button, wait 2 seconds before the start of the test. The same time as6. In the instrument automatic control program, with a test value to determine the program, the obvious wrong test data. (Including the sensor zero drift after the measured value and the impact of strong force) will be automatically deleted processing; Please note that if the instrument automatically delete the current number of test values, it is generally clear the value has been offset, should be cleared Key to re-clear and then continue testing. The same time as7. The maximum allowable setting of the machine and the number of samples, are limited to 255 times, while the number of samples × ≤ ≤ 500, the computer automatically determine whether the memory overflow and the LCD screen text prompt. The same time as8. If you want to print the test curve, you should print after the end of the current test, that is, only print the current test curve, such as the test for the group after the last test, then press the print curve, get on. The same time as9. Note that the force on the clamp should be less than the full scale value of the instrument, avoid the impact of the grip on the grip, or easy to damage the load cell.10. Do the instrument clean, maintenance work, timely on the screw, guide rod plus lubricating oil. The same time as11. Regularly perform the verification of the instrument to ensure the accuracy of the instrument measurements. The same time as12. Non-professional maintenance, the test staff shall not dismantle the instrument, after each demolition must be measured performance test, so as to avoid the phenomenon of instrument misalignment. The same time as13. If there is a sudden failure in the run-time emergency stop, to be restarted.

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