Non-woven fabric processing technology-melt blowing method

Melt-blown non-woven fabric is a high-speed hot air (310~374℃) or other means (such as centrifugal force, electrostatic force, etc.) extruded from the extruder to make the polymer melt extremely It is stretched to form very fine short fibers, which are agglomerated on a perforated drum or cord to form a web, and finally made by self-bonding or thermal bonding.

The basic principle is that the melt is made of The extruder is extruded into the spinneret hole in the special spinneret through the gear pump, and the upper and lower hot air flows are ejected at high speed through the air jet slots above and below the spinneret hole, so the melt extruded from the spinneret hole is fine. The silk is sprayed and stretched by this high-speed hot air flow. At the same time, the cooling air flow at room temperature is brought into the hot air flow on both sides of the spinneret to cool the fibers and form a superfine fiber web on the condensing net device. Hot-rolled or direct-guided winding device to make melt-blown non-woven fabrics.

The requirement of melt-blown raw materials is that the melt flow rate (MFR) of the raw materials must be high. Polypropylene is the most widely used A raw material, and polypropylene has a low MFR, so the temperature of the extruder must be raised, and at the same time, polypropylene with a higher MFR has also been studied. At present, in addition to the widely used polypropylene, polyester, Polyamide, polyethylene, polyurethane, ethylene copolymer and some thermoplastic elastomer 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 melt-blown non-woven fabrics are: filter materials, medical materials, sanitary products, oil-absorbing materials, clothing materials, wipes, hot-melt adhesive materials, electronic special materials (batteries, battery separators, etc.), Special fibers, etc. From the perspective of the market size of these uses: 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 For special fibers, the amount is less.

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