Products used in pharmaceutical industry and other industries
PP melt blown filter element is a tubular filter element made of non-toxic and odorless polypropylene particles through heating, melting, wire spraying, traction and receiving.If the raw material is mainly polypropylene.It can be called PP melt blown filter element.It is not only used for water purification in large quantities, but also has outstanding chemical compatibility, suitable for filtering strong acids, strong bases and organic solvents.It has strong pollution receiving capacity, long service life and low cost.
Sterilization: withstand 126 ° C for 30 minutes online steam sterilization.
Endotoxin: the content of endotoxin in the water extract of the filter column is lower than 0.5EU/ml after lAL test
Performance characteristics
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(1) Filtration efficiency and precision, uniform pore density of filter element, and filtration efficiency of more than 99%.
(2) The filter resistance is small, the filter flow is large, the amount of dirt is large, and the service life is long. The fiber diameter and gap of this product can be adjusted during the production process. The inner layer of the filter element is small and the outer layer is large, which increases the flow and the amount of dirt. The filter element is not easy to block, and extends the service life.
(3) High self cleanliness, no pollution to water quality, acid and alkali resistance, organic solvents, corrosion.
(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 filter efficiency will not decrease when the temperature exceeds 90 ℃.
(5) This product has extremely high hydrophilicity after treatment and modification of polypropylene, and can absorb ten times the weight of water, so it can be used for oil-water separation.
manufacturing process
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The structure of PP melt blown filter element is a gradual diameter tightening structure with coarse outer fiber, fine inner fiber, loose outer layer and compact inner layer.The unique gradient deep filtration has formed a three-dimensional slag filtering effect, which is characterized by high porosity, high retention rate, large sewage holding capacity, large flow rate and low pressure drop.
Melt blown process is a kind of polymer extrusion nonwovens process, which originated in the early 1950s. In order to collect radioactive particles from nuclear tests, the U.S. Navy Laboratory began to develop filter materials with ultra-fine filtration effect, and published research results in 1954.Melt blown technology in China originated in the late 1950s and early 1960s, and the equipment studied is intermittent.By the late 1960s and early 1970s, the number of batch meltblown equipment in China had reached more than 200.The continuous production line was introduced from the United States and Germany from about 92-94.So far, it is estimated that there are still more than 300 intermittent meltblown equipment in operation nationwide.
Theoretically, all thermoplastic (high-temperature melting, low-temperature solidification) polymer chip raw materials can be used for the manufacturing process of melt blown filter element.Polypropylene is one of the most widely used chip materials for melt blown process. In addition, the common polymer chip materials for melt blown process include polyester, polyamide, polyethyleneteflon、polystyrene, PBT, EMA, EVA, etc.The polymerization degree of olefin polymer raw materials (such as polypropylene) is high, so the melt blowing can be smooth when the heating temperature is 100 ℃ higher than its melting point, while the melt blowing can be carried out when the heating temperature of polyester is slightly higher than its melting point.Olefin raw materials generally do not need drying.
The structural features of PP melt blown filter element areFiber finenessIt is relatively small, usually less than 10 μ m, and the fineness of most fibers is between 1~4 μ m.
matters needing attention
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1. Filter element shall be selected according to the accuracy of the filtering liquid and the impurities contained in it. Viscous liquid can be filtered in two stages, and the primary filtration can be used to reduce the resistance and extend the service life of the filter element (generally 3-4 times).
2. Install the filter element correctly. If the filtered water is polluted, carefully check whether the filter element is skewed, and whether the two ends are aligned and pressed tightly.
3. When the pressure difference reaches 0.2MPa, the filter element shall be cleaned or replaced.
application area
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Pharmaceutical industry: prefiltration of various injections, liquid medicines and injection bottle washing water, prefiltration of large infusion, and various antibiotics and traditional Chinese medicine injections.
Food industry: filtration of alcohol, beverage and drinking water.
Electronic industry: prefiltration of pure water and ultrapure water.
Petroleum and chemical industry: filtration of various organic solvents, acids and alkalis, and oilfield water injection filtration.
