In this persistence battle against “new crown pneumonia epidemic”, the protective supplies used by the majority of medical workers and the people, such as those who have a protective clothing, protective clothing, mainly use spunbond and meltblown nonwoven fabric. Post-processing production.
What is a nonwoven material?
According to the national standard GB / T 5709-1997, nonwoven material, commonly known as non-woven fabric, which is a sheet-shaped flakes made from each other by rubbing or randomly arranged by friction, bonding or bonding or combination of these methods. Nets or fluffs (excluding paper, machine fabrics, tufted fabrics, seamless fabrics with sewing yarns and wet strain felt products). The fibers used may be natural fibers or chemical fibers; can be short fibers, filaments or fibers formed on the spot. In order to distinguish the wet nonwoven material and paper, it is also specified that the fibers having a long diameter greater than 300 in its fiber component account for more than 50%, or the long diameter is more than 300, which only accounts for only 30% of the total quality. However, its density is less than 0.4 g / cm3, which belongs to the nonwoven material, which is reversed as paper.
“Heart Layer” melting cloth of the mask
Most masks are mainly composed of three-layer nonwoven fabric, and the inner layer and outer layer are all spunbond (s), “heart layer” is a meltblown nonwoven fabric (M), which is a key core material for blocked protection. . Spinning composite nonwoven fabric also has varieties such as SMS, SMMS, SSMMS.
Non-woven material characteristics
1. Materials between traditional textiles, plastics, leather and four flexible materials of paper. Different processing techniques determine the performance of nonwoven materials, and some nonwoven materials like traditional textiles, such as hydrobi-woven materials; some like paper, such as dry paper nonwoven materials; there are still like leather, such as nonwoven materials Base PU leather and so on.
2, the appearance of nonwoven materials, structural diversity. Nonwoven materials used in raw materials, process technology, determine the appearance and structural diversity of nonwoven materials. On the structure, most nonwoven materials are mainly in the fibrous structure, and there is a single-layer thin web geometric structure that is two-dimensionally arranged, and the fiber is arranged in three-dimensional arrangement, and some of the fibers are wrapped around. The formed fiber grid structure, the structure between the fibers and the fibers, in the interstitial point, and some are fixed by chemical adhesives to fix fiber grid structures, and some of the fibers The geometric structure formed by the aggregate; from the view, the nonwoven material has a cloth, a mesh, a felt, a paper shape, and the like.
3, diversity of nonwoven material properties. Due to the diversity of raw materials, the diversity of processing technologies will inevitably produce diversity of nonwoven material properties. Some materials are flexible, some are very hard; some materials are very strong, and some are very weak; some materials are very relaxed, but some are very fluffy; some materials are very thick, and It is fine. Therefore, the performance of the material can be designed according to the use of the nonwoven material, thereby selecting the corresponding process techniques and raw materials.
Classification of nonwoven materials
The types of nonwoven materials can be scored in the network, reinforcement or use. According to the network, it can be divided into dry-based network (mechanical combing, airflow network), wet surface (circular mesh method, oblique network method) and polymer spinning network (spunbond, meltblowing method , Membrane cracking, electrostatic method). According to the reinforcement method, it can be divided into mechanical reinforcement (needle, water spitral, suture), thermal bonding (hot rolling, hot air, ultrasonic adhesion) and chemical bond (impregnation, spray, foam, printing) , Solvent, etc.). According to the purpose, it can be divided into medical sanitary materials, filtration materials, geotextile materials, vehicle materials, construction materials, electrical electronics industry materials, packaging materials, agricultural materials and household decorative materials, etc., are applied to all aspects of our daily lives.
Post time: Dec-06-2021