PLA melt-blown fiber is to melt PLA slices through a screw extruder, spray them into fibers through a spinneret hole, and under the injection of high-speed hot air, it is strongly stretched to form extremely fine particles. short fibre. These short fibers are adsorbed on the web-forming curtain, and the fibers are condensed into a web and adhered to each other to form a melt-blown non-woven fabric, which is then packaged into rolls.
PLA meltblown fiber has both the advantages of PLA and the advantages of the meltblown process. As an environmentally friendly material, PLA has the characteristics of renewable, biodegradable, biocompatible, low carbon emission and low energy consumption. PLA, a linear thermoplastic biodegradable aliphatic polyester, uses starch extracted from some annual plants such as corn, wheat, and cassava as the initial raw material, so its source is renewable. PLA products will be completely decomposed into CO2 and H2O within 30 days under the action of microorganisms, water, acid and alkali in soil or water after they are discarded, and then become the starting material of starch under the action of solar photosynthesis, which will not harm the environment. Produce pollution, so it is a completely natural circulation type of biodegradable material. The current synthesis process of PLA basically uses L-lactic acid as the monomer, and L-lactic acid is a normal sugar metabolite in the human body, so PLA fiber has excellent biocompatibility in the human body. Compared to other petrochemical plastics, PLA can reduce CO2 emissions and energy consumption. 3.4 kg of CO2 is released per kg of PLA slices. At the same time, PLA meltblown nonwovens have the advantages of short process, simple process and low cost because of the meltblown process, which is why PLA is applied in the meltblown process.
It is not necessary to pay attention to the shelf life of the melt-blown cloth when storing the melt-blown cloth. Because the melt-blown cloth has electrostatic adsorption, it needs to be moisture-proof during the preservation process, and when the melt-blown cloth is produced, it should be sealed and stored in time, and the production of masks should also be sealed and packaged. These are the three necessary requirements for preserving meltblown cloth.
Therefore, to save the meltblown cloth, pay attention to the following steps:
The first step: the shelf life of meltblown cloth. Because the main component of meltblown cloth is polypropylene, this component will degrade naturally over time.
Step 2: Meltblown cloth has electrostatic adsorption, there is static electricity in it, and it needs to be moisture-proof. If the static electricity is gone, it becomes an ordinary non-woven fabric, and the filtration efficiency of bacteria and viruses is not even 35%.
Step 3: Meltblown cloth mainly relies on electrostatic adsorption to absorb viruses in the air, etc., and electrostatic adsorption needs to be dried. Generally, meltblown cloth should be sealed and stored in time after production, and masks should also be sealed and stored.
