PLA Meltblown Filter for Mask

The melt-blown cloth of the mask is made of polypropylene. The melt-blown cloth is made of a polypropylene material called high-melt finger fiber. It is an ultra-fine electrostatic fiber cloth that can effectively use static electricity to absorb virus dust, fly. This is also an important reason why masks can filter viruses.

Medical masks generally adopt a multi-layer structure, referred to as SMS structure: a single-layer spunbond layer (S) on both sides, a single-layer or multi-layer melt-blown layer (M) in the middle, the best material for the melt-blown layer It is meltblown cloth. The main material that brings the virus filtering effect to the mask is the M layer in the middle-meltblown non-woven fabric.

In fact, these three layers are all non-woven fabrics, and the raw materials are polypropylene, but the production process is different. Among them, the fiber diameter of the spunbond layer on the inner and outer sides is relatively thick, about 20 microns; the fiber diameter of the meltblown layer in the middle is only 2 microns, which is made of a polypropylene material called high-melt finger fiber. It is fragile and cannot be washed with water or sprayed with alcohol. Even if it is wet and then dried, it will destroy the fibers and cause loopholes. The virus will also pass through the loopholes, and the mask will lose its protective ability.

Polylactic acid meltblown fiber: 

Under the epidemic, wearing masks has become the new normal, while traditional PP masks are not degradable, which brings huge pollution problems, while polylactic acid non-woven fabrics and meltblown cloths can make fully degradable masks. In view of the shortcomings of low strength and poor toughness of polylactic acid, reactive montmorillonite is added to polylactic acid, and the reactive montmorillonite is reacted with the end groups on the broken molecular chain of polylactic acid to prepare modified polylactic acid. It can achieve the purpose of effectively improving its shortcomings. The modified polylactic acid shows better comprehensive properties, the impact modulus is improved, the elongation at break is improved, the strength is improved, the thermal stability is also improved, and it can be completely degraded under natural conditions, which is harmless to the environment and safe. Environmentally friendly, at the same time, it has good mechanical properties, good hydrophilicity and adhesion, and is very suitable for the production and processing of masks.