Knowledge of non-woven fabrics in masks

Why the raw materials are insufficient? The price of masks has changed several times. How much do you know about non-woven fabrics and fabrics? Detailed description of the non-woven fabric function of medical masks. Because non-woven fabrics are called non-woven fabrics, the benchmark for non-woven fabrics is mostly non-woven fabrics. With the outbreak of the novel coronavirus pneumonia, medical protective clothing and medical masks have entered people's field of vision. Their main production material is non-woven fabrics. Non-woven fabrics are also called non-woven fabrics. Non-woven fabrics have the characteristics of short process flow, fast production speed, high output, low cost, wide use, and multiple sources of raw materials. The main process of non-woven fabrics is fiber formation-consolidation-post-treatment, and the types are mainly classified according to the method of netting. Mainly include thread sticking, spunlace, dipping, acupuncture, hot calendering and so on. The non-woven fabric in the mask is a spunlace non-woven fabric, which can spray a layer of high-pressure micro-water jets or multiple layers of fiber nets to bond the fibers and solidify the fiber nets. Has a certain strength. The raw material of the non-woven fabric is polypropylene, and the raw material of the plastic bag is polyethylene. The names of the two substances are similar, but the chemical structure is different. The chemical molecular structure of polyethylene is quite stable. Because it is difficult to decompose, plastic bags will be decomposed for a long time. The chemical structure of polypropylene is easily damaged, is effectively decomposed, and enters the next environmental cycle in a non-toxic form. Generally speaking, non-woven fabrics can recycle the end materials in processing to make new non-woven fabrics. There is no harm in cloth. The filtering effect of the mask non-woven fabric is good, and the air permeability is slightly poor. The surface and back of the mask non-woven fabric are generally non-woven materials, with filter paper in the middle, which gives its filtering effect to a level. Non-woven fabric has the characteristics of moisture-proof, breathable, flexible, light weight, non-combustible, easy to decompose, non-toxic and non-irritating, rich in color, low price, and recyclable. For example, polypropylene) pellets are used as raw materials, which are melted at high temperature, spinning, laying, and hot-pressing.