How to test the fatigue resistance and heating life of PET Braided Sleeve

Let's first understand the bending resistance and heating wire of the PET Braided Sleeve device, and what is the numerical comparison after repeated stretching and bending fatigue tests! Since the Cable Sleeve pipe needs to be wrapped with 4 fine carbon fiber heat conducting wires during extrusion, and then the Cable Sleeve pipe material repels other materials, so the PET braided sleeve and the heat conducting wire are not bonded to each other. Forcibly wrapped and extruded will cause the inner hole to loosen and the value will change. big!

1. ≤200 times of bending and stretching: Pet Braided Sleeve device and heat conduction value have no significant change, can be kept within the normal value range of 10KΩ, and there will be no obvious change in resistance value. The product can be used normally, and the plugs at both ends are still maintained. It can bear 5KG and has traction strength.
2. ≤1000 times of bending and stretching: the resistance value can still be guaranteed to have no obvious fluctuation within the range of 10KΩ. At this time, when the skin of the PET Braided Sleeve device is cut, it can be found that there will be looseness between the heat conduction wire and the braided network tube package, and pull it hard You can pull the heat conduction wire slightly, and observe that the hole diameter between the heat conduction wire and the Cable Sleeve becomes larger, because the PET Braided Sleeve device is bending, and various heat conduction threads become loose, not the change in the diameter of the Cable Sleeve pipe! This moment has had some influence to PET Braided Sleeve device, but does not affect its use.
3. ≤10,000 times of bending, bending and stretching: During the continuous high-strength bending process, 4 thermal conductive wires will appear loose, and in severe cases, they will break.
Test method: When the current is connected to the test, the resistance value exceeds the standard and can reach 30Ω~70Ω. If it is floating at 20~30Ω, then it means that one of the heat conduction wires is broken and loose, which will cause the resistance value to change, and so on, the greater the resistance value, the more the number of broken or loose thermal conductive wires in the PET Braided Sleeve device! The sudden decrease in the heating life makes it unusable, and it also increases the chance of loosening of the heat conduction wire as a braided process in high-strength fatigue work.
Solution: After production, use the method of adding vulcanization twice to make the vulcanization of the Cable Sleeve more complete and shrink smaller, so that the thermal conductive wire has extra space in the Cable Sleeve wrapping to cope with the fatigue test, and at most it will not That is, straightening the thermal wire will not directly break or loosen it.
The advantage of secondary vulcanization is that it can tightly wrap the heat conduction wire in the PET Braided Sleeve device and shrink at the same time. At this time, it is necessary to reserve more heat conduction wire during the extrusion process. What does it mean? For example, if your product is 1.2 meters long, and the middle heating pipe is 1.18 meters long, then the heat conduction wire should be a little longer than the Cable Sleeve pipe, because the heat conduction wire has no stretchability, and the test is to bend and stretch In the test, because the Cable Sleeve has the characteristics of stretchability and the heat conduction wire does not, after being bent, the heat conduction wire can only rely on the hardness of the product itself to resist the force caused by bending, so long-term use will lead to damage in the PET Braided Sleeve device. The thermal conductive wire can't withstand a large tensile force for a long time, and it will break or become loose! If you reserve enough length of thermal wire, you can use the length of the product itself in the bending test to deal with the bending radius length caused by bending, so that you don`t have to bear the force of bending and stretching, and the heating life can also be extended. Get adequate guarantees.