Neumag's new technology for making non-woven fabrics

A drafting groove and spinning line length The drafting groove used by Neumag's spunbonding equipment has two characteristics, namely an ultrasonic nozzle and a smaller groove length. The equipment has large stretching capacity and high production efficiency. The spinning length is determined by the spacing of the spinnerets [5 ～ 6], the length of the drafting groove can be adjusted by individually reducing the height of the platform; the forming distance can be adjusted by moving the top platform and the bottom platform, and the most suitable spinning is selected according to different products The length of the yarn to maintain the spinning speed. The difference between this technology and the conventional spunbond technology is that the length of the spinning thread is short and can be adjusted; a narrow short-groove drafting device is used to draw the fiber from the narrow groove and the drag generated when the airflow interacts with the fiber. The distance between the slot and the netted conveyor belt can be adjusted flexibly. Neumag's spunbonding equipment can meet the needs of spinning different raw materials, and the linear density of monofilament can be as thin as 0.78dtex. The cooling zone of this model is very short, using positive pressure. Due to the short spinning distance, small air resistance, large inertia, the spinning speed can be accelerated, PET spinning speed can reach 8000m / min, PP spinning speed can reach 6000m / Min, stretching is driven by air flow instead of relying on the viscous friction between the air flow and the tow.
Two Nonoval new technology Neumag spunbond technology is currently the company's Nonoval spunbond nonwovens latest technology, product strength can reach the level of Spunbond non-woven fabric, and the linear density was comparable to the melt-blown nonwovens The fiber diameter is 0.7 ～ 4μm. This process uses cold air to stretch the melt extruded from the spinneret.The cold air enters from both sides of the nozzle and the melt is stretched and split.The key to the technology is that the stretching air flow is introduced into a first contraction and then Diffused nozzle (Laval nozzle). When the melt just enters the nozzle, the surface is rapidly solidified by the cooling and stretching of the cold air, and the inner layer of the fiber is still liquid; when the airflow reaches the throat of the nozzle, its speed reaches subsonic speed, the air diffuses rapidly, and the pressure of the airflow is sharp It descends and reaches a vacuum state, which causes a strong pressure difference between the inner layer and the surface layer of the fiber, and finally splits into many fibers like an explosion.
In Newmarg's Nonoval technology, the speed of the melt and the air flow are simultaneously increased in the Laval nozzle, using cold air drawing, the filament is thinned or attenuated causing splitting, low energy consumption, high output, filament diameter and melt blown The process is equivalent.