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Analysis of three different nonwoven meltblown processes

  • Author:Junqian Nonwoven
  • Source:Junqian Nonwoven
  • Release on :2019-03-21
https://www.nonwovenproductsupplier.com/products/NON-WOVEN-FABRIC.htmIn nonwovens, meltblowing techniques areused to extrude fibers directly from the polymer to form a web. The thermoplastic fiber polymer is extruded through a die comprising closely packedspindles. While the polymer is turbulent at high temperatures, room temperatureair permeates into the venting hot air stream so that the melt flow can becooled and solidified to form fibers. The venting air then blows the fiberstoward the collection device where they contact the location to bond themselvesto form a web.

Fibers produced by a meltblowing processtypically have low or no molecular orientation. Factors affecting the finalproperties of the meltblown fibers(PP Melt Blown Non Woven Slipper) and web include: temperature, melt extrusionflow, nozzle hole geometry, gas flow rate and temperature, spray receivingdistance DCD, and the like. Changing any of the parameters can change the properties of the fiber, such as cross-sectional shape, diameter, structure,and fiber mesh structure.

The fibers are formed by three different forces: air resistance near the die, air resistance near the collection device,and fiber elongation due to entanglement, although most of the draft occursnear the die.

There are three meltblowing(PP Meltblown Fabric Company) processes, the most common of which is the use of high velocity gas streams to produce fibers between 2 and 5 microns in diameter. This process is now commercially available. Ultra-high velocity gas streams can produce super-flow fine fibers with a diameter of less than 1 micron. Although this method can also producefibers as small as 0.1 microns in diameter, it is still under development. Lowvelocity gas streams typically produce 1 denier and larger diameter fibers. Thesplit cross-sectional fiber morphology can be provided to aid in the sub-micronfiber diameter achieved by the flux injection process, but the fiber diametersso far have been successful ranging from 1 to 2 microns.

PP Melt Blown Non Woven Supplier, PP Meltblown Fabrıcs Company, Polypropylene Meltblown Fabrics FactoryPP Melt Blown Non Woven Supplier, PP Meltblown Fabrıcs Company, Polypropylene Meltblown Fabrics Factory

The fine fibers produced by the conventional melt-blown technology can form a soft fabric with excellent hidingpower and opacity. In view of fineness and a large amount of fibers, the bond strength of the melt-injected web can be greatly enhanced by fiberentanglement. Further, the melt blown web is characterized by a high specific surface area per unit weight and a very fine porosity.

However, the spraying process has some disadvantages. Only low viscosity materials can be spun into a molten spray webto avoid excessive expansion of the polymer at the exit of the spinneret. It isestimated that more than 90% of the meltblown nonwoven fabric(Ploypropylene Meltblown Fabric Factory) is made from polypropylene at a flow rate (MFR) of from 1000 to 1500 g / 10 minutes. Theinability to use different polymers also limits many applications of melt-jetnetworks.

Another disadvantage is that meltblown fibers have low mechanical properties, primarily due to their low molecularorientation or lack of molecular orientation, and generally the use of lowmolecular weight polymers.

As with electrospun nanofibers, meltblownfibers typically require a support structure and are typically composite. Thisallows FPNS to optimize its filtering performance to meet the needs of itscustomers, which of course also allows FPNS to increase in cost and increase inmanufacturing complexity.