Needling is a kind of mechanical reinforcement method, which began to be used in felt production. As early as 1870, a British company made a prototype of needling machine. However, it was not until the 1940s that bywater made a significant improvement on the old acupuncture machine that it laid the foundation for the development of modern acupuncture technology. In 1957, James hunter company made a further improvement on the balance mechanism of the eccentric wheel of the spindle drive of the needle machine, so that the sprint speed reached 800 times / min. With the continuous application of new technology and new materials, the performance of modern acupuncture machine has been greatly improved. The speed and width of the machine can reach 3000 times / min and 16m respectively.
The basic principle of needling method is: repeatedly needling the fluffy web with a needle with triangular cross section (or other shape) and a hook on the edge. When thousands of needles are inserted into the web 1, the hook on the needle 2 will carry some fibers on the surface of the web with the needle through the web. At the same time, due to the effect of friction, the web will be compressed. When the needle enters a certain depth, it rises again. At this time, because the barb is clockwise, the fiber leaves the barb and stays in the fiber net in a nearly vertical state, just like many fiber East "pins" nail the fiber net, so that the compressed fiber net will not return to its original state, which makes the needle punched non-woven fabric with a certain thickness and strength.
