How to achieve N95+ melt-blown non-woven fabric, with our professional manufacturers to understand.
There are many factors affecting the quality grade of melt-blown nonwoven fabrics
From raw materials to equipment
Every process is critical
Even if there are only individual factors
The quality of the final product can also vary greatly
After Razer in-depth research and repeated tests
Melt blown non-woven fabrics up to N95+
The following eight areas must be strictly controlled
Now with everyone careful way
melt-blown material
1.It has low odor,low ash content,high metric and narrow molecular weight distribution.
2.Higher liquidity.
3.excellent fiber performance, can make the fiber elongation is higher,the wire diameter is smaller.
4.continuous silk, drop material, spinnability is better.
5.easy to use, more stable processing performance.
6.It can be used for the production of filter material,oil-absorbing cotton,garment auxiliary material,battery diaphragm and other applications of melt-blown process.
how to do melt-blown cloth
1.The fiber must be fine, the melting rate of raw material and the diameter of spinneret plate are matched,and the spinneret process is optimized,so that the fiber reaches 0.3um.
2.to match good electret equipment and choose good electret masterbatch.A good electret master particle must have the ability to store charge and permanently generate an electric field.
3.The validity period of the mask in electret mainly depends on the content of electret masterbatch.Electret masterbatch is similar to battery, adding ratio will determine its life and adsorption capacity.
4.Dry the meltblown cloth and store it.It cannot be in contact with the humidity of the outside air.Vacuum packing is best.Moisture in the air and charge in the meltblown cloth will be converted to negative ions,and the loss of charge will affect the filtration efficiency.
3.Reasons for substandard melt-blown cloth
1.Spinneret and melt-blown equipment
2.electrostatic electret equipment
3.long-term electrostatic electret master material
4.melt spray material or high melt finger fiber material
5.professional and experienced machine adjustment master
6.Site management of melt-blown production
how to choose melt-blown material
1.melting: polypropylene by adding peroxides thermal degradation or metallocene hydrogen adjustment method,polypropylene melting to reach the appropriate high level,can produce nanoscale fiber.
2. The melting point of particles should be reduced to between 150-170°C.
3. After adding electret master particle, the meltblown cloth will generate electrostatic adsorption performance through the electret device to block the virus.
4.after the modification of polypropylene particles, the fiber ejected by the melt-blown cloth machine at high temperature and high pressure is fine and long.
5.The fluid fiber ejected from the raw material self-melting nozzle is soft, tough and firm.
6.high temperature sterilization.
electret master batch selection
1.electrostatic load time, whether can be long charged up to 1 years or more.
2.electret masterbatch does not plug the meltblown hole, meltblown cloth load charge, how can make the positive charge long-lasting stay on the meltblown cloth, can
After half a year or after a year no charge loss, become the test electret master batch and electret process key index.
3.Long block cycle, long effect electret, PFE exceeds 95.
Electret process treatment
1.The mainstream application is mostly corona charging method for electreting treatment of melt-blown cloth.Charging voltage,charging time,charging distance and environmental humidity all have an impact on the effect of electreting treatment.
The charging voltage has the most obvious effect on electret effect,the charging distance has the medium effect, and the charging time has the least effect.Pay attention when adjusting the machine.
2.The ambient humidity has an impact on the generation and loss of static electricity. The melt-blown cloth enterprise should monitor the temperature and humidity in the workshop at all times.Increase the corresponding equipment to keep the temperature and humidity in the workshop within a certain range.
melt-blown material
1.If meltblown polypropylene stays at high temperature and pressure for a long time,it is easy to sinter and carbonize.
2.When adjusting the machine temperature, first of all,it is necessary to determine whether the actual temperature of the barrel and the mold on the melt-blown machine is consistent with the set temperature.Generally small melt-blown equipment display temperature and actual temperature will be very different.
3.melting refers to 1500 polypropylene,if the temperature is set at more than 270℃,a little high.
Melt blowing equipment selection
1.The configuration should be complete: extruder → screen changer (filter)→ metering pump → die head → distribution plate (auxiliary hot air)→ spinneret → mesh device to form melt-blown cloth.
2.the extruder speed,the parameters of the metering pump, the advantages and defects of the die head,the temperature and velocity parameters of the hot air flow,the Angle of the die head, the Angle of the air blade, the receiving distance of melt-blown material, the adsorption parameters under the net forming device and so on jointly determine the quality of the melt spraying cloth.
The above is the production process of melt-blown nonwoven fabric.We are a professional non-woven fabric manufacturer,Huizhou Jinhaocheng Non-woven Co.,Ltd.I hope this article has been helpful to you.
Post time: Jan-07-2021