Wearing a mask properly will help prevent the spread of bacteria in the air and minimize the chance of getting respiratory infections. However, the ability to prevent bacteria depends a lot on the type of mask and the materials that make it. Nonwoven fabric was born as a perfect choice in the textile industry.
What is the nonwoven fabric?
Nonwoven is a fabric-like material made of short (short) and long (continuous long) metallic fibers, bonded together by chemical, mechanical, thermal, or solvent treatment. This term is used in the textile manufacturing industry to refer to fabrics, such as felt, nonwoven or non-knitted.
Raw materials for the manufacture of nonwovens are fibers, natural, man-made, and synthetic fibers. Polypropylene, polystyrene, polycarbonate, polyethylene, polyester, etc. fibers are suitable for the production of non-woven films of medical masks.
Depending on the different production technology, nonwoven fabrics are mainly divided into categories:
- Spunbond nonwoven fabric (S / SS / SSS)
- Fusing fabric and spunbond woven fabric (SMS / SMMS).
What is SSS, SMS, SMMS?
Spunbond (S) – molten spinning or Meltblown (M) – blow-blow technology is commonly applied by manufacturers in the technology of spinning directly from plastic particles to form a fiber film.
To achieve economic efficiency, it is common to produce 3-ply (SMS) or 5-ply blended fabrics (SSMMS), etc., which are nonwovens formed from the arrangement of the fiber backing. The outer layer is the Spunbond membrane and the inner layer is the Melt blown film. The more layers of fabric, the greater the ability to prevent antibacterial.
SS nonwoven fabric (spunbond + spunbond) is made from the double-spun beam technique, which is softer and more tougher than PP, often used as the outermost layer of medical masks.
Spunbond Meltblown Spunbond, commonly known as SMS is a tri-laminate nonwoven fabric. It is made up of a top layer of polypropylene spunbond. It is a layer between fused polypropylene, and a bottom layer of polypropylene spunbond, which has very good water resistance. This is the reason why manufacturers often choose to use SMS materials in the manufacture of masks.
Conventional grades of medical masks
- The outer layer is usually a spunbond no-woven fabric, which is waterproof, prevents large particles, bacteria.
- The second layer is a meltblown nonwoven fabric that prevents small particles, bacteria or viruses from less than 1 µm or larger. The effectiveness of preventing bacteria or viruses is usually determined by this class.
- The innermost layer is usually a spundbond fiber membrane, direct contact with the user’s face requires careful treatment to create comfort for the user.
In addition, with some 4.5-layer specialized masks, there is an additional layer of meltblown filter or thin cotton cloth to increase the ability to prevent the invasion of bacteria in the environment.
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