With the outbreak of pneumonia caused by new coronaviruses, the demand for medical supplies has surged everywhere, and there are two main protective materials that are most in need: one is medical protective clothing and the other is medical masks, and their main production The raw material is non-woven fabric.
Non-woven fabrics are also called non-woven fabrics and non-woven fabrics. Traditional fabrics, whether they are woven or knitted, or other weaving methods, go through fiber-spinning-weaving, and non-woven fabrics do not require spinning, hence the name. The non-woven fabric has no warp and weft, so it is very convenient to cut and sew, and it is light and easy to set. Non-woven fabric breaks through the traditional textile principle, and has the characteristics of short process flow, fast production rate, high output, low cost, wide use, and many sources of raw materials.
The main process of non-woven fabrics is fiber web-consolidation-post-treatment. The types are mainly classified according to the method of consolidation web, mainly including spunbond, spunlace, dipping, needle punching, hot rolling, etc. The non-woven fabric in the mask is a spunlace non-woven fabric, which sprays a high-pressure micro-water stream onto one or more layers of fiber webs to entangle the fibers together, so that the fiber web can be strengthened and has a certain strength.
In terms of environmental protection, the raw material used for most non-woven fabrics is polypropylene, and the raw material for plastic bags is polyethylene. Although the two substances have similar names, they are far from each other in chemical structure. The chemical molecular structure of polyethylene is quite stable and extremely difficult to degrade, so the plastic bag takes 300 years to decompose; and the chemical structure of polypropylene is not strong, and the molecular chain can be easily broken, which can be effectively degraded And, in the non-toxic form, it enters the next environmental cycle. In general, the scraps of non-woven fabrics during processing can also be recycled to produce new non-woven fabrics without any harm.
