Pp material, also known as polypropylene (pp), is a kind of plastic, a thermoplastic, a non-toxic, odorless, tasteless milky white high crystalline polymer with a density of only 0. 90-0. 91g/cm3, which is widely used in household products such as pots, barrels, films and woven bags. Pp materials are light in weight, good in toughness and chemical resistance, but lack in rigidity, poor in weather resistance, long in service time, easy to age, fragile and deform. Pp polypropylene can also be used as meltblown material, which is used as raw material for making mask sanitary products such as non-woven fabrics. Pp polypropylene melt-blown material is particularly stable to water, and the water absorption rate in water is only 0. 01%. Pp polypropylene is a kind of thermoplastic material with high melt index and excellent fluidity.
It is a kind of plastic extrusion device to use melt index meter and pp melt index meter, also known as melt flow rate meter. The thermoplastic measured by mvr method is placed in the material barrel of the instrument at the specified temperature, so that the measured object reaches the melting state, and is extruded through the small hole of the standard die under the specified load. The volume flow rate mnr(cm3/10 min), which converts the extrudate into a standard die every 10 minutes, is less than 10 min, which is used to characterize the physical characteristics of the test object such as fluidity and viscosity in the molten state.