Modified PP Resin For Melt-blown Nonwovens

# We sell plastic raw material # Modified PP Resin for Melt-blown Nonwovens

The main melt viscosity control methods are:

• Use of oxidizers or peroxidizers

• Relying on the mechanical shearing action of the screw extruder

• Controlled working temperature for thermal degradation

For polypropylene with low MFI, all three methods are usually used simultaneously to control the melt viscosity for meltblown formation of ultrafine fibers.

The meltblown process requires polypropylene with a narrow molecular weight distribution in order to process out-of-fine fibers. New catalytic technologies allow polymer producers to produce polypropylene feedstocks with high MFI and narrow MWD, and the three aforementioned degradation measures can further reduce the molecular weight distribution.

Modified PP Resin for Melt-blown Nonwovens has a wide melt temperature range, which is more favorable for the thermal bonding process commonly used in nonwoven processes. For conventional applications, the heat resistance of polypropylene is sufficient.

Compared to other polymeric raw materials, meltblown polypropylene melt with a low viscosity and narrow molecular weight distribution results in finer fibers with the same energy consumption and the same drafting conditions. The fineness of polypropylene meltblown nonwoven fibers is typically 2 to 5 μm. The narrow molecular weight distribution reduces the elasticity of the melt, so the melt filaments extruded from the spinneret holes of the meltblown die head can be made finer by hot air flow drafting.

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