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The Spring Festival of 2020 is different from previous years. A sudden new coronavirus pneumonia swept across China at this time of the New Year, disrupting people's lives and work, and the people of the whole country joined the fight against the new epidemic of pneumonia . In this fight against the epidemic, masks for protecting against viruses have become essential items for the people of the country, and masks have become a scarce supply for a while. The processing of masks cannot be separated from the fabrics of masks, and the production of masks fabrics cannot be separated from the spinning and melting production line.
Mask material
At present, the masks for virus protection are basically non-woven fabrics, and the face mask fabric is composed of a spunbond non-woven fabric and a melt-blown non-woven fabric produced using polypropylene (PP) as a raw material.
Fabric composition of masks
It can be seen that medical masks have at least 3 layers, which is what we call the SMS (2 layers S layer and 1 layer M layer) structure. At present, the highest number of layers in China is 5 layers, that is, SMMMS (2 layers S layer and 3 layers). Layer M layer).
The materials of the "S" and "M" layers are:
S stands for Spunbond. Its fiber diameter is relatively thick, about 20 microns (μm). The two S spunbond layers mainly support the entire non-woven fabric structure and do not have much effect on the barrier.
Meltblown layer M (Meltblown) is an important barrier layer. It is a very fine and electrostatic meltblown non-woven fabric with a fiber diameter of about 2 microns (μm). Dust, bacteria, and droplets containing viruses are close to this. After this kind of meltblown non-woven fabric, it will be electrostatically adsorbed on the surface of the meltblown fabric and cannot be penetrated. Since suspended particles such as dust are captured by ultra-fine electrostatic fibers, they are not easy to be detached due to washing, and washing with water will destroy the electrostatic suction capacity, so this mask can only be used once.
Spunmelt Nonwoven Production Technology
The basic process of spinning and spunbonding non-woven fabrics and melt-blown non-woven fabrics includes spinning a polymer (such as PP) into a spinning melt through a screw extruder, and spraying from a spinneret at a certain temperature and pressure. After being cooled, drawn into filaments, the filaments are separated and laid on a netting device, and then consolidated into a non-woven fabric.
There are multiple production processes for spunbond nonwovens and meltblown nonwovens, but the main processes are basically the same.
The spunmelt nonwovens production technology entered China from the 1980s. After more than 30 years of rapid development, a variety of more mature spunmelt nonwovens production processes have been formed. China's spunmelt nonwovens production capacity and output are located in the world. Forefront. The running speed of domestic spunmelt production line has developed from dozens of meters per minute in the early days to the current 600m / min (already put into production), with a spunbond output of 180Kg / m / h and fiber fineness ≤1.6 den; Up to 70Kg / m / h, fiber fineness of 2 ~ 5μm.
The application of spunmelt non-woven fabrics in medical isolation materials can be used in addition to masks, surgical gowns, protective clothing, surgical gowns, surgical drapes, sterilization curtains, patient clothes, sheets, bedspreads, medical equipment covering materials, etc. .
Source: Textile Net
Dongyang Laichi Environmental Protection Technology Co., Ltd. has always been committed to the research, development and production of medical non-woven fabrics, spunbond non-woven fabrics, elastic non-woven fabrics, and non-woven products. The elastic non-woven fabrics produced by the company can be replaced, recycled and reused, so they can no longer worry about health problems.
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