How to make meltblown nonwoven fabric N95 +

Yancheng Ruize Masterbatch Co., Ltd.

Wang Xiaoyu 15005109233

There are many factors that affect the quality grade of meltblown nonwovens

From raw materials to equipment

Every process is crucial

Even if there are only individual differences

The quality of the finished 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

I will talk to you carefully

1. Melt-blown material

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

2. Higher liquidity.

3. Excellent fiber forming performance, can make fiber elongation higher and wire diameter smaller.

4. Continuous spinning and dripping, better spinnability.

5. Easy to use, more stable processing performance.

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

Second, how to do a good meltblown cloth

1. To make the cloth well, the fibers must be made fine. The melting index rate of raw materials and the aperture of the spinneret are optimized to optimize the spinning process.

2. Match good electret equipment and select excellent electret masterbatch. A good electret masterbatch must have the ability to store charge and permanently generate an electric field.

3. The effective period of the electret of the mask mainly depends on the content of the 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 melt-blown cloth in dry place and avoid contact with outside air humidity. It should be vacuum packed. The moisture in the air and the charge of the meltblown briquettes will be converted into negative ions, and the loss of charge will affect the filtration efficiency.

3. Reasons for the failure of meltblown fabric

1. Spinneret and meltblown equipment

2. Electrostatic electret equipment

3. Long-acting static electret masterbatch

4. Melt blown material or high melt fiber material

5. Professional and experienced tutor

6. On-site management of meltblown production

Fourth, how to choose melt-blown materials

1. Melting finger: polypropylene is thermally degraded by adding peroxide or metallocene hydrogen conditioning, etc. The polypropylene melting finger reaches a suitably high level and can produce nano-scale fibers.

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

3. After the electret masterbatch is added, the melt-blown cloth will produce electrostatic adsorption performance after passing through the electret device to block viruses.

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

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

6. High temperature sterilization and disinfection.

5. Selection of electret masterbatch

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

2. The electret masterbatch does not block the meltblown holes, and the meltblown cloth carries electrical charge. How can the positive charge last for a long time on the meltblown cloth? It can be used for half a year or a year without losing charge. Key indicators of pellets and electret processes.

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

6. Electret process

1. Most of the mainstream applications are the electret treatment of the meltblown cloth by the corona charging method, and the charging voltage, charging time, charging distance and environmental humidity all have an effect on the effect of the electret treatment. Among them, the charging voltage has a significant effect on the electret effect, the charging distance has a medium effect, and the charging time has a small effect. Pay attention when commissioning the machine.

2. The environmental humidity has an impact on the generation and loss of static electricity. The melt-blown cloth enterprise should always monitor the temperature and humidity in the workshop. Add corresponding equipment to keep the temperature and humidity of the workshop within a certain range.

7. Melt-blown materials

1. If melt-blown polypropylene stays at high temperature and high pressure for a long time, it is easy to sinter and carbonize.

2. The temperature must first be determined when the machine is adjusted. Whether the actual temperature of the barrel and the mold on the melt-blown machine is consistent with the set temperature. Generally, the display temperature of the small meltblown equipment and the actual temperature will be very different.

3. For polypropylene with a melt index of 1500, if the temperature is set above 270 ° C, it will be a bit high.

8. Selection of meltblown equipment

1. The configuration must be complete: extruder → screen changer (filter) → metering pump → die head → distribution plate (auxiliary hot air) → spinneret → net forming 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 head, the temperature parameters of the hot air flow temperature, the angle of the die head, the angle of the air knife, the receiving distance of the melt-blown material, and the adsorption parameters under the netting device jointly determine the melt spray The quality of cloth.

Ruize specializes in the production of electret masterbatch

With a rigorous scientific attitude and

Excellent technical strength

Ensure that the meltblown nonwoven fabric reaches N95 + quality

Help the high-quality development of the healthcare industry