white spunbond nonwoven fabric
Doubling refers to the entanglement of many fibers during the process from spinning to forming a nonwoven fabric, causing the filament bundles to be consolidated on the nonwoven fabric. superficial phenomenon. In addition to the adhesion and paralleling of the primary filaments due to poor cooling of the quenching wind during spinning, there are three main places where paralleling can be formed: the nozzle tunnel, the spinning device and the net curtain of the web forming machine. This paper briefly introduces the reasons and improvement measures for parallel filaments in the nozzle shaft in the white spunbonded non-woven fabric production line. The narrow slit size of the mainstream outflow section (commonly known as the throat) in the nozzle of the white spunbond nonwoven fabric production line is a key dimension, and the requirements are quite strict, and the general control accuracy is h7. But it is more difficult to maintain this precision in the length of 600mm during processing. Because h7 changes within a certain range, the air flow rate of the mainstream is not equal, the flow rate is inconsistent, and the fluctuation of the flow rate causes uneven static pressure. Originally, all streamlines are required to be vertically downward, but in the tunnel, there is a The horizontal component of the airflow, under the blowing of the horizontal airflow, the fibers may be entangled to form parallel filaments.