With the outbreak of pneumonia caused by the new corona […]
With the outbreak of pneumonia caused by the new coronavirus infection, the demand for medical supplies in various places has surged, and there are mainly two main protective materials that are most needed: one is medical protective clothing, 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 woven, knitted or other weaves, undergo fiber-spinning-weaving, and non-woven fabrics do not need to be spun, hence the name. The non-woven fabric has no warp and weft threads, it is very convenient to cut and sew, and it is light and easy to shape. Non-woven fabrics break through the traditional textile principles, and have the characteristics of short process flow, fast production rate, 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. The types are mainly classified according to the method of consolidation and formation, mainly including spunbond, spunlace, dipping, needle punching, hot rolling, etc., and production The non-woven fabric in the mask is a spunlace non-woven fabric, which sprays high-pressure fine water onto one or more layers of fiber nets to entangle the fibers with each other, so that the fiber nets can be reinforced and have a certain strength.
In terms of environmental protection, the raw material of most non-woven fabrics used is polypropylene, while the raw material of plastic bags is polyethylene. Although the names of the two substances are similar, their chemical structures are far different. The chemical molecular structure of polyethylene is very stable and extremely difficult to decompose, so it takes 300 years for plastic bags to be decomposed; while the chemical structure of polypropylene is not strong, the molecular chain can easily be broken, which can be effectively degraded , And enter the next environmental cycle in a non-toxic form. The scraps of general non-woven fabrics in the processing can also be recycled and re-made into new non-woven fabrics without any harm.