Medical Non woven has - a core component of surgical/N95 Mask filter media

25-07-2022

The masks have always been mentioned as an effective tool against environmental threats. They are considered protective equipment to preserve the respiratory system against the non-desirable air droplets and aerosols such as viral or pollution particles. The aerosols can be pollution existence in the air, or the infectious airborne viruses initiated from the sneezing, and coughing of the infected people. The filtration efficiency of the different masks against these aerosols is not the same, as the particles have different sizes, shapes, and properties.

Surgical masks are basic products and are relatively cheap (when they are not in short supply). However, their production involves several types of inputs and the assembly of different parts in a relatively sophisticated process. The filtering property of masks is a function of a multi-layered structure made of non-woven fabric. The most commonly used material is polypropylene, a polymer derived from petroleum oil. Polypropylene is “melt-blown” to obtain fibers of a small diameter in a random pattern that can trap small particles. The fibers are electrically charged so that particles are attracted while the air passes through (electret treatment).

Different layers of non-woven fabric and textile are then assembled through ultrasonic welding. The minimum is three layers: an inner layer in contact with the mouth that can absorb moisture (generally white), a filter layer made of melt-blown electret non-woven material (as described above), and an outer layer protecting against liquid splashes (blue, to be distinguished from the inner layer). Cotton or other types of fabric can be used for the inner and outer layers (but they can also be made with non-woven fabrics).

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