How is the heart layer meltblown cloth of the mask produced?

What are nonwoven materials?

According to the national standard GB/T 5709-1997, non-woven materials, commonly known as non-woven fabrics, refer to sheets and fibers made of oriented or randomly arranged fibers combined with each other through friction, cohesion or bonding or a combination of these methods. Netting or batting (excluding paper, woven fabrics, tufted fabrics, stitchbonded fabrics with stitched yarns and wet milled felts). The fibers used can be natural fibers or chemical fibers; they can be short fibers, filaments or fibrous objects formed on the spot. In order to distinguish wet-laid nonwoven materials from paper, it is also stipulated that fibers with an aspect ratio greater than 300 account for more than 50% of the total mass, or fibers with an aspect ratio greater than 300 only account for more than 30% of the total mass. However, those whose density is less than 0.4g/cm3 belong to non-woven materials, otherwise they are paper.

The "heart layer" meltblown cloth of the mask

Most masks are mainly composed of three layers of nonwoven fabric, the inner and outer layers are mostly spunbond fabric (S), and the "heart layer" is meltblown nonwoven fabric (M), which is the key core material for the mask to achieve the barrier protection function . There are also SMS, SMMS, SSMMS and other varieties of spunmelt composite nonwovens.

Characteristics of nonwoven materials

1. Materials between the four flexible materials of traditional textiles, plastics, leather and paper. Different processing technologies determine the performance of nonwoven materials. Some nonwoven materials are like traditional textiles, such as spunlace nonwoven materials; some are like paper, such as dry paper nonwoven materials; and some are like leather, such as nonwoven materials. Base PU leather etc.

2. The appearance and structure of non-woven materials are diverse. The diversity of raw materials and processing technology used in nonwoven materials determines the diversity of appearance and structure of nonwoven materials. From a structural point of view, most non-woven materials are mainly fiber-network structures. There are single-layer thin mesh geometric structures in which fibers are arranged in two dimensions, and network geometric structures in which fibers are arranged in three dimensions. Some fibers are entangled with fibers. The formed fiber grid structure, some are the structure where the fibers are bonded at the junction points, some are the fiber grid structures that fix the fiber junction points with chemical adhesives, and some are fiber grid structures. The geometric structure formed by the aggregate; from the appearance point of view, non-woven materials are cloth-like, mesh-like, felt-like, paper-like, etc.

3. Diversity of properties of nonwoven materials. Due to the diversity of raw material selection and processing technology, the performance of non-woven materials is bound to be diverse. Some materials are very flexible and some are very hard; some materials are very strong and some are weak; some materials are dense and some are very fluffy; But very thin. Therefore, the performance of the material can be designed according to the use of the nonwoven material, and then the corresponding process technology and raw materials can be selected and determined.

Classification of nonwoven materials

The types of nonwoven materials can be divided according to the method of web formation, reinforcement method or use. According to the web forming method, it can be divided into dry-laid web (mechanical carded web, air-laid web), wet-laid web (rotary web method, inclined web method) and polymer spun web (spun-bonded method, melt-blown method) , film splitting method, electrostatic method). According to the reinforcement method, it can be divided into mechanical reinforcement (needle punching method, spunlace method, stitching method), thermal bonding (hot rolling method, hot air method, ultrasonic bonding method) and chemical bonding (dipping, spraying, foam, printing , solvents, etc.). According to the use, it can be divided into medical and sanitary materials, filter materials, geosynthetic materials, automotive materials, construction materials, electrical and electronic industry materials, packaging materials, agricultural materials and home decoration materials, etc., which are used in all aspects of our daily life.