Processing Mechanism of Spunbonded Nonwovens

First, pour the slice into the trough, then into the hopper, and finally slice into the screw extruder. The extruder sleeve is heated in sections, and the chips are squeezed and melted in the extruder and then enter the continuous pre-filter and then enter the spinning box. The melt enters the spinning head through the metering pump. Depending on the accurate metering of the metering pump, the melt is quantitatively fed into the spinneret and sprayed through the orifice to form a continuous stream of melt, ie, nascent fibers. The nascent fibers are then subjected to monomer absorption, cold air cooling, and air drafting to form filaments. The filament bundle is reciprocally oscillated by the pendulum roller and the suction of the positive and negative pressure airflow is evenly laid on the meshing curtain to form a fiber web, which is fed into the hot rolling mill by the conveying curtain and thermally bonded by the hot rolling mill to form a spinning Viscous nonwoven fabric . In the production of spunbonding, the stretching and web forming process is the core of the spunbonded nonwoven technology, which can reflect the level of spunbond technology. Air drafting is a distinguishing feature of spunbonded nonwoven technology from chemical fibers. In the drawing tunnel of the spunbonding device, since the airflow speed is much larger than the speed of the yarn extruded from the spinning hole, the frictional resistance of the yarn to the airflow is the main force acting on the yarn, and the yarn is in the airflow. Under the action of friction, the acceleration movement is carried out, and the maximum speed is reached at the slit, so the stretching of the yarn is completed between the spinneret and the slit, and the yarn is finished under the action of the airflow. Stretched into fiber.

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