Knowledge of meltblown PP materials
The real melt-blown material can be degraded. The general 2040 on the market is just ordinary PP material. The real PP melt-blown material is modified. For small machines (modified extruders) currently on the market, high flow is used. Sexual melt-blown materials are unstable. The larger the machine, the better the effect of using high-melt melt-blown PP materials. The quality problems of small machines account for a large part of the reasons. For regular melt-blown cloth, it is necessary to use 1500 melt-finger special melt-blown material, add electret masterbatch and electret process to further improve the filtration efficiency.
High melt refers to melt blown grade pp material
The raw material of the S layer (spunbond cloth) for the production of masks is mainly high melt index PP with a melt index of 35 to 40, while the M layer (melt blown cloth) is a melt blown with a higher melt index (1500) Grade PP. The production of PP of these two types of high melting fingers is inseparable from a key raw material is an organic peroxide degrading agent.
Ordinary PP generally has a low melt index and poor fluidity in the molten state, which limits its application in certain fields. Modification of polypropylene by adding organic peroxides can improve the melt index of PP, reduce its molecular weight, and narrow the molecular weight distribution of PP, so that it has better fluidity and higher spinning rate. Therefore, PP modified by organic peroxide degradation can be widely used in the field of thin-wall injection and non-woven fabrics