Polypropylene is widely used in melt blown processes because it has the following advantages.

1. The viscosity of polymers can be controlled through the use of oxidants or peroxides in the extrusion process, mechanical shear action by the extruder, or control of working temperature for thermal degradation, in order to achieve the goal of regulating melt viscosity.
2. The molecular weight distribution can be controlled. The melt blown non-woven fabric process requires a relatively narrow molecular weight distribution in order to produce uniform ultrafine fibers. By utilizing new catalytic technologies, such as metallocene catalysts, polymers with extremely high melting fingers and narrow molecular weight distribution can be produced
3. A higher melting point is sufficient for most product uses, and polypropylene has a wider melting range of propylene. Scope, therefore, is very advantageous for the commonly used thermal bonding process in non-woven fabric technology.
4. Beneficial for making ultrafine fibers. If the viscosity of polypropylene melt is low and the molecular weight distribution is narrow, it can be made into very fine fibers using the same energy consumption and under the same drawing conditions in the melt blown process. Therefore, the common fiber diameter of polypropylene melt blown non-woven fabrics is 2-5um or even finer.

Due to the use of high-pressure hot air stretching in the melt blown process, it is required to use polymers with higher melt index, which is beneficial for increasing production and reducing energy consumption. At present, the most commonly used polypropylene chips have a melt index of 400-1200g/10min and a narrow molecular weight distribution to produce the required linear density ultrafine fibers.

The polypropylene chips used in melt blown production and processing should have a high and uniform melt index, narrow molecular weight distribution, good melt blown processing characteristics, and more uniform and stable chip quality to ensure the process stability of melt blown nonwoven materials.