Non-woven fabric processing technology-melt blown method

Meltblown non-woven fabrics are extruded polymer melt extruded by high-speed hot air (310~374℃) or other means (such as centrifugal force, electrostatic force, etc.) to make the polymer extremely stretched. The very fine short fibers are formed, which are agglomerated to a porous drum or screen to form a web, and finally made by self-bonding or thermal bonding reinforcement.


The basic principle is that the melt is extruded from the extruder through the gear pump into the spinneret holes in the special spinneret, and the upper and lower hot air streams are ejected at high speed through the jet grooves above and below the spinneret. The melt filaments extruded from the spinneret are sprayed and stretched by this high-speed hot airflow. At the same time, the room temperature cooling airflow is brought into the two sides of the spinneret to cool the fibers and form on the condensing device. The ultra-fine fiber web can be made into a melt-blown non-woven fabric by hot rolling or direct guiding to the winding device.


The requirement of meltblown raw materials is that the melt flow rate (MFR) of the raw materials must be high. Polypropylene is the most used raw material, and the MFR of polypropylene is low, so the temperature of the extruder must be increased At the same time, polypropylene with higher MFR has also been developed. At present, in addition to the widely used polypropylene, polyester, polyamide, polyethylene, polyurethane, ethylene copolymers and some thermoplastic elastomers The raw materials have also been used in the production of meltblown nonwovens to develop and manufacture products that meet different performance requirements.


At present, the main uses of meltblown non-woven fabrics are: filter materials, medical materials, sanitary products, oil-absorbing materials, clothing materials, wipes, hot-melt adhesive materials, electronic special materials (battery, battery compartment, etc.) , Special fiber, etc. From the perspective of the market size of these applications: filter materials are the most widely used, followed by medical and sanitary materials, oil-absorbing materials, clothing materials, wipes, etc. are ranked third, while hot-melt adhesive materials, electronic special materials and special fibers are in the third place. Less usage.