How does meltblown non-woven fabric achieve N95+

There are many factors that affect the quality of meltblown non-woven fabrics


From raw materials to equipment


Every process is crucial


Even if there are only individual differences


The quality of the final product may also vary greatly


After Rize's in-depth research and repeated testing


Meltblown non-woven fabric reaches N95+


The following eight aspects must be strictly controlled





Now I'm going to talk to you in detail


One, melt blown material


1. It has low odor, low ash, high isotacticity and narrow molecular weight distribution.


2. Higher liquidity.


3. Excellent fiber-forming properties, which can make the fiber elongation higher and the wire diameter smaller.


4. Continuous silk, dripping, better spinnability.


5. Easy to use, more stable processing performance.


6. It can be used in the production of melt-blown technology for filtering materials, oil-absorbing cotton, clothing accessories, battery diaphragms and other applications.


Two, how to make melt blown cloth


1. To make the cloth, the fiber must be made thin. The raw material melting rate and the diameter of the spinneret are matched, and the spinning process is optimized, and the fiber reaches 0.3um.


2. It is necessary to match good electret equipment and select good electret masterbatch. A good electret masterbatch must have the ability to store charges and permanently generate an electric field.


3. The effective period of mask electret mainly depends on the added content of electret masterbatch. The electret masterbatch is similar to a battery, and the addition ratio will determine its service life and adsorption capacity.


4. Store the finished meltblown cloth in a dry place, and it should not be in contact with the humidity of the outside air. Vacuum packaging is best. The moisture in the air and the charge of the melt-blown cloth will be converted into negative ions, and the loss of charge will affect the filtration efficiency.


Three. Reasons for the non-compliance of melt blown cloth


1. Spinneret and melt blown equipment


2. Electrostatic electret equipment


3. Long-lasting electrostatic electret masterbatch


4. Melt blown material or high melt finger fiber material


5. Professional and experienced tuning master


6. Meltblown production site management


Fourth, how to choose melt blown material


1. Melt finger: The polypropylene melt finger reaches a suitable higher level through the addition of peroxide thermal degradation or metallocene hydrogen adjustment method, and nano-level fibers can be produced.


2. The melting point of particles should be reduced to between 150-170°C.


3. After adding the electret masterbatch, the meltblown cloth will have electrostatic adsorption performance through the electret device to block the virus.


4. After the polypropylene particles are modified, the fibers sprayed out by the melt-blown cloth machine at high temperature and high pressure are thin and long.


5. The fluid fiber sprayed from the melt nozzle of the raw material is flexible, tough and firm.


6. High temperature sterilization and disinfection.


Five, electret masterbatch selection


1. Whether the electrostatic load time can be charged for a long time for 1 year or more.


2. The electret masterbatch does not block the melt blown hole, and the melt blown cloth is loaded with electric charge. How to make the positive charge stay on the melt blown cloth for a long time can be a test without losing charge after half a year or a year. The key indicators of electret masterbatch and electret process.


3. Long blocking period, long-term electret, PFE exceeds 95.


VI. Electret process treatment


1. Most mainstream applications are the corona charging method for electret treatment of meltblown cloth. The charging voltage, charging time, charging distance and environmental humidity all have an impact on the effect of electret treatment. Among them, the charging voltage has the most obvious influence on the electret effect, the charging distance has a medium influence, and the charging time has the least influence. Attention should be paid when debugging the machine.


2. The environmental humidity has an impact on the generation and loss of static electricity. Meltblown cloth enterprises should always monitor the temperature and humidity in the workshop. Increase the corresponding equipment to keep the temperature and humidity of the workshop within a certain range.


Seven, melt blown material


1. Melt-blown polypropylene is easy to be sintered and carbonized if it stays at high temperature and high pressure for a long time.


2. When adjusting the machine, the temperature must first be determined, whether the actual temperature of the barrel and mold of the melt blown machine is consistent with the set temperature. Generally, the displayed temperature of small melt blown equipment and the actual temperature will be very different.


3. If the melting point of polypropylene is 1500, if the temperature is set above 270℃, it is a bit high.


8. Meltblown equipment selection


1. The configuration should be complete: extruder→screen changer (filter)→metering pump→die head→distribution plate (auxiliary hot air)→spinning plate→netting device to form melt blown cloth.


2. The speed of the extruder, the parameters of the metering pump, the advantages and disadvantages of the die, the temperature and speed parameters of the hot air flow, the angle of the die, the angle of the air knife, the receiving distance of the meltblown material, the adsorption parameters under the netting device, etc. Determine the quality of melt spray cloth.