The flexibility of fiber refers to the bending ability and recovery ability of fiber under the action of external force, which is one of the important physical properties of fiber. In the textile industry, flexibility is an important factor affecting spinning, weaving, finishing and wearing comfort. Therefore, testing the flexibility of fibers is very important for the textile industry. This article will introduce the main equipment for flexibility testing.
The main flexibility testing equipment is the bending test machine. The bending testing machine can measure the bending performance of fibers under different strain conditions, including indicators such as bending stiffness, bending recovery and bending modulus. The following are several common bending testing machines:
1. Suspension bending test machine
The suspension bending tester is mainly used to measure the flexibility of long fibers. The device suspends the sample from a hook and then applies a weight that causes the sample to bend under gravity. During the test, the bending angle and bending recovery rate of the sample under different loads can be measured.
2. Bending Stiffness Tester
A bending stiffness tester can be used to measure the flexibility of short fibers. The device clamps the sample between two parallel grips and then applies a bending load. During the test, the bending stiffness and bending modulus of the sample under different loads can be measured.
3. Bending recovery testing machine
The flex recovery tester measures the ability of fibers to recover after bending. This device fixes the sample in a fixture and then applies a bending load. During the test, indicators such as the recovery angle and recovery time of the sample after bending can be measured.
The bending fatigue testing machine can be used to measure the performance change of fibers after multiple bending. The device clamps the sample between two parallel grips and then applies a bending load. During the test, indicators such as the bending angle and bending recovery rate of the sample after multiple bendings can be measured. The device can simulate the stress state of fibers during wearing and washing to better understand the changes in fiber properties.
In conclusion, the bending test machine is the main equipment for testing the flexibility of fibers, and the flexibility of fibers can be evaluated by measuring the bending properties of fibers under different strain conditions. Choosing the right equipment needs to consider factors such as fiber type, length, and indicators to be tested.