Simulation Analysis of the Bed of Needling Machine Producing High Gram Weight Nonwovens

The needle punctures non-woven fabrics up and down reciprocating when the needling machine producing high gram weight nonwovens is working. The bending deformation of the supporting bed, an important part, will be caused by impact loads such as penetration force. Based on the basic principle of mechanical vibration, the vibration bending and mode shapes of the supporting were analyzed by field measurement and finite element simulation. The results showed that the deflection of the bed was affected by the penetration force under certain working conditions. But the influence value was small and the downward bending deflection was within the allowable range. The needling process would not cause resonance of the machine since its first four natural frequencies in Z direction were much larger than the working frequencies. The engineering significance of the study is to ensure that the needle punching machine meets the requirements of strength and stiffness, and realizes the function of producing high gram weight nonwovens.