1.Spunbonded nonwovens
Spunbond nonwoven material is used as protective material. Its strength and comfort performance meet the requirements, but its barrier performance is relatively weak. Aiming at this problem, fine denier spunbond technology has become a hot research topic. Freudenberg (Ke Debao), Germany, first invented two component spunbond spunlore technology, using a hollow orange petal spinning component. After extruding the melt flow from a spinneret hole, a filament was laid on a net curtain through a cooling blow and a air draft, and a high pressure Spunlaced technique was used to open fiber and solid net. Compared with ordinary spunbonded or spunlaced nonwoven materials, it can be used for medical protection materials.
2.SMS composite technology
In view of the bad effect of the spunbonded nonwovens and the low strength of the melted nonwovens, some people use the strength and wear resistance of the spunbonded fabric as the surface layer, and the SMS composite nonwovens have been prepared by using the barrier properties of the melt spout as the core layer. In view of the problem that most of the SMS composite protective materials are using PP as raw material and the protection performance of various radioactive materials is poor, Liu Xing and others of Tianjin University of Technology cooperated with a department of Navy, using barium sulfate on SMS materials to prevent the penetration of radioactive materials, so it can be used to protect medical personnel from unnecessary The interference of radioactive substances, causing lesions, has played a better role in isolation and protection. The coating material can also be made into a slow release microcapsule shape for coating. When the external force is applied, the microcapsules will burst, and the protection performance will be enhanced.
3.Flashing Nonwovens Technology
Compared with SMS, the flash evaporation technology is formed by the solution spinning method and the solvent is volatile organic solvent. It is difficult to recover the solvent, and the high concentration in the air can easily cause the explosion accident. In addition, the spinning speed control of the fiber is very difficult in the process of production. At present, the technology is monopolized by the DuPont (DuPont) Company of the United States. Its protective clothing made from the Tyvek product of the flash process combines protection, durability and comfort, which protects workers from small to micron particles, but has relatively high cost.
