|Spunbond Non-Woven Equipment Production Line Description
The production line adopts the direct melt extrusion spinning method of polymer, and uses the principle of aerodynamics to make the tow move in a certain flow field.Get more news about Smmss Non-woven Non-woven Fabric Production Equipment,you can vist our website!
The process of decelerating by air diffusion, dividing the silk and laying the net, and then consolidating the fiber net into a cloth by means of point bonding.
In spinning, the full-width slit is the drafting device. Due to the long drafting distance, the drafting air pressure is used more efficiently, which can give the tow drafting force and save energy. And the drafter is manufactured in one piece, so it does not require maintenance and repair during use.
In the aspect of splitting and laying the net, the bell-mouth air duct is used to use the diffusion and deceleration of the airflow to make the tow spiral downward in the natural state. Because the fiber is in a messy laying state, the anisotropy of the fiber is guaranteed and directly controlled. The vertical and horizontal strength, uniformity and tensile strength of the finished fabric.
In the production process, since the whole process of spinning, drawing and splitting is in a closed state, it avoids the interference of external wind and reduces In order to meet the environmental requirements, the continuous and stable production process can be maintained. Schematic diagram of production process:
The production process of spunbond non-woven fabric: PP chip → chip conveying device → mixer (mixed with other functional master batches) → screw extruder (screw melting) → melt filter (filter impurities) → metering pump metering (Control the amount of yarn) → Spinning box, spinneret (form a single filament) → Drafting channel (cooling drafting) → Mesh belt (laying net) → Hot-rolling bonding (to fix the fluffy web Knot) → winding → slitting (cutting into specifications required by customers)
Spunbond Non-Woven Equipment Production Line Major Equipment
The metering pump is an external gear pump. When the gears are in meshing operation, the gear meshing and disengagement will increase the volume of the suction chamber and form a negative pressure. The polymer melt is sucked into the pump and fills the valleys of the two gears. The melt is driven by the gear to close to the inner wall of the “8”-shaped hole and is sent to the outlet cavity after rotating for nearly a week. Due to the continuous change of the volume of the outlet cavity, the polymer melt can be discharged smoothly.
The amount of polymer melt output per revolution of the metering pump is called the nominal flow rate of the metering pump, and the ratio of the actual flow rate of the pump to the theoretical flow rate is called the volumetric efficiency of the pump. There are many factors that affect the volumetric efficiency, such as the sealing performance of the pump joint surface, the gap that causes the melt backflow, the speed, the inlet and outlet melt pressure, and the melt viscosity. The total efficiency of a gear metering pump is the product of volumetric efficiency and mechanical efficiency. For gear pumps with higher precision, the total efficiency is usually 0.90 to 0.95.
The important parts of the spinning system are composed of box, melt distribution plate, spinneret, etc. The spinning process can use a single large-scale spinneret, or it can be formed by splicing multiple small-sized plates. Moreover, rectangular plates are more commonly used, followed by circular plates.
The diameter of the spinneret hole should be determined according to the shear rate gradient of the fiber-forming polymer melt flowing in the spinneret hole. Generally, the diameter and length of the spinneret hole are larger, and the spinning is relatively stable, especially for high viscosity melts. The spinning is advantageous.
This process is carried out simultaneously with the deformation of the melt trickle. The temperature of the tow extruded from the spinneret is quite high. Cooling can prevent the adhesion and entanglement between the filaments. With the stretching, the viscous melt stream gradually becomes a stable solid fiber. The spinning process often adopts the form of single-sided side blowing and double-sided side blowing. The cooling medium is clean air-conditioned air. The air volume should ensure the flow mode is a stable laminar flow state, so as to avoid the vibration of the thread and affect the uniformity of the thread. . The cooling process is accompanied by the crystallization process. In the initial stage, the temperature is too high, and the thermal motion of the molecules is too violent. With the decrease of temperature, the speed of homogeneous nucleation gradually increases, the viscosity of the melt increases, the mobility of the chain segment decreases, and the crystal growth speed decreases.