-
E-mail
sales@darllyfiltration.com
-
Phone
15867199277
-
Address
No.1 Beishan North Road, Xindeng Town, Fuyang District, Hangzhou City
Hangzhou Dali Filter Equipment Co., Ltd
Process principle and application of PP polypropylene melt blown filter cartridge
Date: 2025-08-04Read: 8
1、 Process principle
1. Melt blown molding technology: Using polypropylene (PP) particles as raw materials, they are melted into a liquid state at a high temperature of around 260 ℃, extruded through spinning holes, and stretched into ultrafine fibers (with a diameter of 1-5 microns) under the traction of high-speed hot air flow.
2. Fiber stacking structure: Ultra fine fibers are randomly stacked on the receiving device to form a three-dimensional network microporous structure, with natural entanglement between fibers without the need for adhesives.
3. Gradient filtration design: The filter element adopts a layered structure of 'outer sparse and inner dense', with an outer pore size of about 5 microns to intercept large particle impurities, and an inner pore size gradually decreasing to 1 micron, achieving deep graded interception. This significantly improves the pollutant absorption capacity and delays blockage.
2、 Core performance advantages
1. Efficient interception: Physically intercepting suspended solids such as sediment and rust, with a filtration efficiency of over 99%;
2. Chemical stability: resistant to strong acids, strong bases, and organic solvents (pH 1-13), with a temperature tolerance of up to 90-126 ℃;
3. Safe and environmentally friendly: no adhesive, meets food grade standards (FDA), no secondary pollution;
4. Economy: The dirt absorption capacity is more than three times that of ordinary PP cotton, with a lifespan of up to 6-12 months, reducing the frequency of replacement.
3、 Main application areas
1. Water treatment system
Household water purifier: as a pre filter element to intercept large particle impurities and protect the subsequent RO membrane;
Industrial pure water: pre-treatment of ultrapure water in the electronics industry to remove suspended solids and colloids;
Wastewater treatment: oilfield water injection filtration, electroplating solution purification.
2. Food and Medicine
Beverage clarification: filter impurities from fruit juice and beer;
Pharmaceutical process: Pre filtration of liquid medicine and injection bottle washing water.
3. Special industrial scenarios
Air purification: intercepting micron sized particles and aerosols;
Chemical filtration: Purification of highly corrosive organic solvents.
4、 Key innovation points in the process
By adjusting the melt jet velocity and receiving distance, precise control of fiber diameter and pore distribution is achieved to optimize the pore size gradient; At the same time, high-temperature heat sealing technology enhances the structural strength, allowing it to withstand a pressure difference of 0.4MPa without deformation. Compared to traditional PP cotton wrapped filter cartridges, the fiber uniformity, filtration accuracy, and chemical compatibility of melt blown technology are significantly improved.
