What are the factors that affect the quality of meltblown cloth?

As the best barrier layer for masks, meltblown cloth is an extremely fine material, and the inside is made up of many crisscross microfibers stacked in random directions. Take PP as an example. The higher the MFI, the finer the filaments drawn during meltblown processing and the better the filtration performance.

2. Hot air velocity(Non Woven Meltblown Fabric Wholesale)

Under the conditions of the same temperature, screw speed and receiving distance (DCD), the faster the hot air speed, the smaller the fiber diameter, the softer the hand of the non-woven fabric, and the more fiber entanglement, resulting in a denser and smoother fiber web. Strength increases.

3. Hot air jet angle(Medical Meltblown Filter Vendor)

The hot air jet angle (see Figure 5a) mainly affects the stretching effect and fiber shape. The smaller the angle will promote the formation of parallel fiber bundles, resulting in poor uniformity of the non-woven fabric. If the angle tends to 90°, a highly dispersed and turbulent airflow will be generated, which is beneficial to the random distribution of fibers on the condensed mesh curtain, and the final meltblown fabric has good anisotropic properties.

4. Receiving distance (DCD)(PP Melt Blown Non Woven Factory)

Too long a receiving distance will cause the longitudinal and transverse strength and bending strength to decrease, the non-woven fabric feels fluffy, and will cause the filtration efficiency and filtration resistance to decrease in the meltblown process.

5. Screw extrusion speed

In the case of constant temperature, the screw extrusion rate should be kept within a certain range:

Before a certain critical point, the faster the extrusion speed, the higher the quantitative and the greater the strength of the melt-blown cloth; when the critical value is exceeded, the strength of the melt-blown cloth decreases, especially when MFI>1000, which may be Because the extrusion rate is too high, the wire strands are not sufficiently drafted and the threads are severely combined, so that the bonding fibers on the cloth surface are reduced, and the strength of the melt blown cloth is reduced.