The Leather Folding Tester is used to test the flexural resistance of leather under continuous bending. This instrument is internationally used to evaluate the flexural resistance of various light leathers and their surface finishes. It can also measure the tendency of cracking in creases caused by walking. The flexing mechanism of the flexing tester is different from that of the shoe upper deflection tester, but the two complement each other.
Working Principle and Core Components
The leather flexure tester simulates the bending conditions experienced by leather products in actual use, applying periodic flexural forces to the sample to observe and record deformation, cracks, or fractures under specific conditions. Its core components include:
Drive System: Provides stable power to ensure sample movement along a predetermined trajectory.
Clamping Device: Secures the sample to ensure consistent and accurate testing. This requires a balance of stability and flexibility. Some devices utilize a clamp assembly system with dual clamps and cylindrical blocks. The clamping force is adjusted via handle bolts, creating an elliptical arc-shaped test path to minimize specimen damage.
Control System: Responsible for setting test parameters, monitoring the test process, and processing data. It supports automated management, including setting test parameters, starting, pausing/resuming, and ending tests.
Data Acquisition System: Records and processes various test data in real time, such as the number of flexures, flexure angle, and stress changes, providing a scientific basis for subsequent analysis.
Operation Instructions
1. Rotate the lever of the bend tester mechanism to the left-hand limit, releasing the cylinder reservoir. 2. Place the desired cylinder into the slot. Insert the test piece vertically between the cylinder and the pressure roller, and push it between the lower clamping device. 3. The clamping unit is adjustable; the clamping device should not be completely locked. 4. Pull the black knob to slide the inserted test piece over the guide roller and the clamping unit until it is aligned with the axis. 5. Then, fully tighten the black knob to secure the clamping unit and test plate in this position. 6. Turn the screw on the bending lever to apply pressure to the test piece, with the axis positioned downward. Rotate the bending lever until it reaches the right-hand limit of the instrument. This movement will cause the test piece to bend around the selected axis. 7. The bending test on the bend tester should be performed in a smooth motion, taking 1-2 seconds.
Maintenance
1. Clean dust from the radiator regularly to maintain ventilation.
2. Keep the machine clean at all times. Wipe the machine with a cotton cloth before and after each test to keep it clean. Also use cotton to wipe away any water droplets in the machine to prevent rust on the steel plates and fixtures inside the machine during extended periods of non-use.
3. Regularly spray the machine's metal surfaces with disposable anti-rust oil.
4. Regularly relubricate the machine's transmission components.
5. Clean the condenser and evaporator in the refrigeration unit regularly to ensure the life of the compressor.
6. Check the motor and reducer for proper operation.
7. Check all switches to ensure the counter is functioning properly.
8. Turn on the fan before starting the compressor; otherwise, the compressor will not start.
9. Avoid frequent startup and shutdown of the compressor to maintain its life. If startup is required, wait three minutes or longer between startups.
10. Do not allow paper or other debris to get stuck in the radiator.
