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What are the methods of nonwovens?
- Apr 22, 2017 -

Spunbonded is one of the main methods for the production of nonwoven materials, also known as the method of spinning into the net, the extrusion of polymer.

The principle of the method is to use the chemical fiber spinning method, the polymer spinning, drafting, overlay network, and finally by acupuncture, spunlace, hot rolling or self bonding and other methods to strengthen the formation of non-woven materials.

At present, the melt spinning is the main method, solvent spinning is less, and the wet spinning is less. Spunbond process principle of polymer slicing, slice drying, melting and extruding, spinning, cooling, and drafting, wire, lapping, reinforcement, edge cutting and winding of spunbonded process generally use a single screw extrusion machine, mainly composed of screw sleeve, transmission system, feeding device, heating and cooling device. The average number of spinneret holes must be greater than 1000 /m. The increase of the number of holes is beneficial to the uniformity of the net and the increase of the yield. The arrangement of spinneret holes is determined by the quench device and the direction of air flow. The angle between the holes and the direction of the air flow depends on the shape of the fiber cross section. The melt is extruded from the spinneret hole through the spinneret plate, and undergoes the rheological process of the flow, the micro hole flow, the outflow, the deformation and the stability. The research of spunbonded nonwovens is the development and industrialization of DuPont and Freudenberg in the United States and Europe since the end of 50s. Then in the end of the 60s, the countries all over the world began to produce spunbonded nonwovens, Japan began to start in 70s, the Asia Pacific region in the middle of the 80s to start with the introduction of technology production. Because of the shortcomings of melt injection system, the production speed is lower than that of the spunbonded method, the strength of the fiber is poor, the abrasion resistance is not good, the production efficiency is low, and the production cost is high. Therefore, Exxon's use of spunbond and meltblown basic characteristics of different traditions, combining with the nonwoven spunbond nonwoven technology, the development of spunbond and meltblown composite production technology, a set of production equipment to the production of spunbond meltblown nonwoven fabric products, continuous filament and spunbond meltblown nonwoven fabric with an integrated structure make full use of the advantages and characteristics of two kinds of nonwoven technology, make the product aspect to evenly strength, appearance and hand function to achieve the ideal degree, good resistance, heat preservation, liquid filtration and moisture conductivity formed than traditional nonwoven spunbond nonwovens is more popular on the market.

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