Do you know anything about PP melt blown filter elements? The high-efficiency filter of the fresh air purification machine adopts a composite high-efficiency HEPA filter material (H12) made of ultra-fine glass fiber and PP melt blown filter material, which is suitable for particle sizes less than 0.3 μ The filtration efficiency of suspended particulate matter in m is ≥ 99.97%. Below, we will explain in detail what PP melt blown filter element is.


PP melt blown filter element is made of non-toxic and odorless polypropylene particles, which are heated, melted, sprayed, pulled, and formed. If the raw material is mainly polypropylene. It can be called PP melt blown filter element. Not only is it widely used in water purification, but it is also being used in the air purification industry. And it also has outstanding chemical compatibility, suitable for filtering strong acids, bases, and organic solvents. Strong pollution capacity, long service life, and low cost.



Working parameters



Filtering accuracy: 1µ m、3µ m、5µ m、10µ m、20µ m、30µ m、60µ m


Sterilization: Resistance to 126 ° C, online steam sterilization for 30 minutes.


Endotoxin: After lAL testing, the water extract of the filter column showed an endotoxin content below 0.5EU/ml



Performance characteristics



(1) Filtering efficiency and precision, uniform pore size density of the filter element, with a filtering efficiency of over 99%.


(2) Low filtration resistance, high filtration flow rate, high contaminant capacity, and long service life. During the production process, the fiber diameter and gap of this product can be adjusted. The inner layer of the filter element is small and the outer layer is large, which increases the flow rate and contaminant capacity. The filter element is not easily blocked and extends its service life.


(3) High self cleanliness, pollution-free, acid, alkali, and organic solvent resistant, corrosion resistant


(4) High strength, the filter element will not deform when the water pressure difference between the inlet and outlet of the filter exceeds 0.4Mpa, and the filtration efficiency will not decrease when the temperature exceeds 90 ℃.


(5) After treatment and modification of polypropylene, this product has extremely high hydrophilicity and can absorb ten times the weight of water, making it suitable for oil-water separation.



manufacturing process



The structure of PP melt blown filter element is a gradually increasing diameter structure with coarse outer fiber, fine inner fiber, loose outer layer, and tight inner layer. The unique gradient deep filtration has formed a three-dimensional filtration effect, characterized by high porosity, high retention rate, large pollutant capacity, large flow rate, and low pressure drop.


Melt blown process is a type of polymer extrusion nonwoven process that originated in the early 1950s. In order to collect radioactive particles generated during nuclear testing, the US Navy Laboratory began developing filter materials with ultra-fine filtration effects. The research results were published in 1954. The melt blown technology in China originated in the late 1950s and early 1960s, and the equipment studied was intermittent. By the late 1960s and early 1970s, the number of intermittent meltblown equipment in China had reached over 200. Between approximately 92 and 94, continuous production lines were introduced from the United States and Germany. So far, it is estimated that there are still over 300 intermittent meltblown equipment in operation nationwide.


In theory, any thermoplastic (high-temperature melting, low-temperature curing) polymer chip raw material can be used for the production process of melt blown filter cartridges. Polypropylene is the most commonly used slicing material in melt blown processes. In addition, the commonly used polymer slicing materials in melt blown processes include polyester, polyamide, polyethylene, polytetrafluoroethylene, polystyrene, PBT, EMA, EVA, etc. Olefin polymer raw materials (such as polypropylene) have a high degree of polymerization, so the heating temperature above its melting point of 100 ℃ can smoothly melt and spray, while polyester can melt and spray when the heating temperature is slightly higher than its melting point. Olefin raw materials generally do not require drying.


The structural feature of PP melt blown filter element is that the fiber fineness is relatively small, usually less than 10 microns, with most fiber fineness ranging from 1 to 4 microns.



application area



Air purification industry: air filtration.


Pharmaceutical industry: prefiltration of various injections, liquid medicines and injection bottle washing water, prefiltration of large infusion, various antibiotic and traditional Chinese medicine injections.


Food industry: filtration of alcohol, beverages, and drinking water.


Electronic industry: Pre filtration of pure and ultrapure water.


Petroleum and chemical industries: filtration of various organic solvents, acids, and alkalis, as well as filtration of oilfield water injection.