In the process of fully supplying mask raw materials, we found that some customers often encountered problems when producing melt-blown cloth, which seriously affected production capacity. Especially when the price of melt-blown cloth increased, the losses were huge. Today I will talk about the defect mechanism and countermeasures in the production of melt-blown cloth. I hope it will be helpful to everyone.
In fact, the production of meltblown cloth is not complicated. The problems are nothing more than temperature, air pressure, mold, material, It is caused by factors such as rotation speed, so it is necessary to continuously run in and debug the equipment and process to achieve the best effect of the product. Let’s talk about seven common defects of melt-blown cloth:
01 Crystal Point
Generation mechanism:
a. The air speed is too small or the melt The viscosity is too high, and some of the melt filaments are not fully drawn;
b. The melt viscosity is too small, and when the air speed is high, the spinneret holes hold the melt Weakened, the melt leaves the spinneret before being drawn into fibers.
Solutions:
a. Heating or cooling according to the melt index of the material;
b. Adjust the screw speed;
c. Select the appropriate die head and spinneret hole melt finger material.
02 Feixu
Generation mechanism : The raw material and the corresponding spinning temperature are not well matched, which is caused by the higher temperature.
Solutions:
a. If it is full-width flying catkins, the screw spinning temperature and hot air temperature can be adjusted;
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b. If it is a regional fly lining, the die temperature in the corresponding area can be adjusted.
03 The cloth is brittle and hard
Production mechanism: The melt is not sprayed into fibers or multiple fibers stick together, causing the melt-blown cloth to be brittle and hard.
Solutions:
a. Adjust the hot air pressure;
b , adjust the die temperature;
c. Reduce the feeding amount;
d. Adjust the distance between the roller or curtain and the spinneret. distance.
04 Blocking the hole
Generation mechanism : Generally, hole blocking is mainly caused by adding too much electret masterbatch, too many inorganic components, impurities in the melt-blown material, and no filter.
Solutions:
a. Reduce the amount of electret masterbatch added;
b. Add a filter;
c. Use clean raw materials;
d. Replace the filter in a timely manner.
05 Uneven spinning
Mechanism: The resistance or air flow of each spin hole is different, resulting in a different spin amount in each hole.
Solutions:
a. Use precision die heads and spinnerets with consistent pressure in each spinneret;
b. Replace the filter in time;
c. Clean the spinneret regularly;
d. Reduce the amount of electret masterbatch added.
06 Stomata
Generation mechanism: The moisture content of the material is too high, causing water vapor to splash during the spinning process and produce pores.
Solution: Dry the material.
07 Low filtering efficiency
Generate Mechanism:
a. The sprayed fibers are thicker and have large gaps;
b. No electret masterbatch or added Not enough;
c. No corona treatment or insufficient treatment.
Solutions:
a. Increase the temperature;
b. Adjust the receiving distance of the cloth;
c. Reduce the feeding amount;
d. Increase the atmospheric pressure;
f. Increase the electret masterbatch content;
e. Corona treatment. </p
