DRK111 Foldability Tester, the instrument adopts photoelectric control technology to make the folding chuck return automatically after each experiment, which is convenient for the next operation. The instrument has powerful data processing functions: it can not only convert the number of double folds of a single sample and the corresponding logarithmic value, but also count the experimental data of multiple samples in the same group, and can count the maximum The minimum value, average value and coefficient of variation, these data are stored in the microcomputer, and can be displayed through the digital tube. In addition, the instrument also has a printing function. It is an optical-electromechanical integrated structure, which can automatically count the number of double-folds of the tested sample. Main Purpose: It is a special instrument for measuring the folding fatigue strength of paper, cardboard and other sheet materials (copper foil in the electronics industry, etc.) with a thickness of less than 1mm. It is mainly used in carton factories, quality inspection institutes and paper-making inspection departments of universities and colleges to test the folding endurance of paper and cardboard. Technical Standard: GB/T 2679.5 "Determination of Folding Resistance of Paper and Board (MIT Folding Tester Method)" GB/T 457-2008 "Determination of Folding Endurance of Paper and Cardboard" ISO 5626 "Paper-Determination of Folding Resistance" Technical Parameter: 1. Measuring range: 0～99999 times 2. Folding angle: 135±2° 3. Folding speed: 175±10 times/min 4. The width of the folding head is: 19±1mm, and the folding radius: 0.38±0.02mm. 5. Spring tension: 4.91～14.72N, every time 9.81N tension is applied, the spring compression is at least 17mm. 6. The distance between the fold opening is: 0.25, 0.50, 0.75, 1.00mm. 7. Print output: modular integrated thermal printer 8. Upper clamping thickness range: (0.1~2.30)mm 9. Upper clamping width range: (0.1~16.0)mm 10. Upper clamping force area: 7.8X6.60mm/51.48mm² 11. Upper clamping force torque: 19.95:5.76-Wid9.85mm 12. Parallel positioning height of the sample: 16.0mm 13. Lower folding chuck: The tension change caused by eccentric rotation is not more than 0.343N. 14. The width of the lower folding head is: 15±0.01mm (0.1-20.0mm) 15. Lower clamping force torque: 11.9:4.18-Wid6.71mm 16. Folding radius 0.38±0.01mm 17. Reproducibility: 10% (WHEN 30T), 8% (WHEN 3000T) 18. The length of the sample is 140mm 19. Chuck distance: 9.5mm Instrument calibration: 1. Calibration of the tension spring: put the weight on the plate and observe whether the indicator value of the pointer is equal to the weight, check three points: 4.9, 9.8, 14.7N, three times per point, if there is a deviation, move the pointer position , Make it reach the next value, if the deviation is small, it can be adjusted with a fine adjustment screw. 2.Verification of the change of the tension indication: press the tension bar, make the pointer point at the position of 9.8N, clamp a high-strength sample between the upper and lower chuck, turn on the machine and fold it for 100 times and then stop it. Slowly turn the knob by hand to make the folding head fold back and forth once, and observe that the change in the indicator value of the pointer cannot exceed 0.34N. 3.Test the friction of the tension rod: put the weight on the weight plate, first gently hold the tension rod by hand, then slowly lower it to the balance position, read F1 on the scale, and then pull the tension rod down , And then slowly relax it to return to the equilibrium position. The position reading indicates F2, and the friction force of the tension rod shall not exceed 0.25N. The calculation formula is as follows: F = (F1 － F2) /2 <0.25N Maintenance: 1. Wipe the arc of the folding head with a soft lint-free fabric to keep the instrument clean. 2. When not in use for a long time, please remove the power plug from the power socket. Note: Due to technological progress, the information will be changed without notice. The product is subject to the actual product in the later period.