Detailed introduction of screw extruder for meltblown non-woven fabric process control guidance

The extrusion capacity and extrusion speed of the screw extruder The extrusion capacity and extrusion speed of the screw extruder directly affect the spinning speed and spinning volume of the nozzle. On the premise that other process conditions remain unchanged, with the increase of the screw speed, the extrusion volume and the extrusion speed are correspondingly increased, and the more thin streams are ejected from the nozzle, and the formed fiber diameter is smaller. Under the same gram weight, there are more fibers per unit area, and the chance of bonding to each other increases. After the fiber web is reinforced, the bonding and knitting between fibers are stronger. However, when the extrusion speed reaches a peak, it tends to decrease. The reason may be the insufficient drafting rate of the meltblown process itself, which leads to a decrease in the number of bonded fibers on the cloth surface and the appearance of doubling. As the extrusion volume and extrusion speed of the screw extruder increase during production, the vertical and horizontal strength, tear strength, elongation at break and bending stiffness of the product increase accordingly. Temperature control in each zone of the screw extruder The screw extruder is the key to forming a uniform melt. According to the state of the slices in each area of u200bu200bthe extruder, the temperature setting is very important, which directly affects the smoothness of the spinning process and the physical and mechanical properties of the product. If the temperature is too low, the rheological properties are not good, and the viscosity is too large, which will block the spinneret and cause injection filaments and increase the surface defects; if the temperature is too high, there will be greater thermal oxygen degradation, which will affect the uniformity of the web. Table 9-2 shows the temperature settings of each zone of the screw extruder for different products. The article is organized from: Non-woven official website