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Study on the Relationship Between Structure Parameters and Filtration Performance of Polypropylene Meltblown Nonwovens

Xiao Yuanxiang, Sakib Nazmus, Yue Zhonghua, Wang Yan, Cheng Si, You Jianmin, Militky Jiri, Venkataraman Mohanapriya, Zhu Guocheng

Autex Research Journal

2020

Vol. 20, no. 4

366--371

In this study, polypropylene meltblown nonwoven fabrics with different structure parameters such as fiber diameter, pore size, and areal density were prepared by the industrial production line. The morphology of meltblown nonwoven fibers was evaluated by using scanning electron microscope, and the diameter of fibers was analyzed by using image-pro plus software from at least 200 measurements. The pore size of nonwoven fabric was characterized by a CFP-1500AE type pore size analyzer. The filtration efficiency and pressure drop were evaluated by TSI8130 automatic filter. The results showed that the pressure drop of nonwoven fabrics decreased with the increase in pore size; the filtration efficiency and the pressure drop had a positive correlation with the areal density. However, when the areal density is in the range of 27–29 g/m2, both filtration efficiency and pressure drop decreased with the increase of areal density; when the areal density was kept constant, the filtration efficiency decreased as the pore size decreased; when the pore size of the meltblown nonwoven fabric is less than 17 μm, the filtration efficiency increased as the pore diameter decreased; when the pore diameter of the nonwoven fabric is larger than 17 μm. In a wide range, the pressure drop decreased as the fiber diameter decreased.

Experimental and Numerical Simulation Study of an Air drawing Model of Polyethylene Terephthalate (PET) Polymer and Model of Air Jet Flow Field in the Spunbonding Nonwoven Process

Bo Z

Fibres & Textiles in Eastern Europe

2014

Vol. 22, no. 1 (103)

89--96

An air drawing model of polyethylene terephthalate (PET) polymer and one of the air jet flow field in the spunbonding process are established. The air jet flow field model is solved and simulated by means of the finite difference method. Numerical simulation computation results of the distributions of air velocity match quite well with the experimental data. The air drawing model of the polymer is solved with the help of distributions of air velocity measured by Particle Image Velocimetry. The model’s predictions of filament fiber diameters, crystallinities and birefringences coincide well with the experimental data. Therefore it can be concluded that a higher initial air temperature can yield finer filament fiber diameter, and a higher initial air velocity can produce a finer fiber diameter as well. The experimental results show that the agreement between the results and experimental data is much better, which verifies the reliability of these models. Also they reveal great prospects for this work in the field of the computer assisted design (CAD) of the spunbonding process.

Opracowano model przepływu powietrza nadmuchiwanego przy wytwarzaniu włóknin spunbonded z PET. Model pola przepływowego powietrza wydmuchiwanego z dyszy został rozwiązany i zasymulowany za pomocą metody skończonych różnic. Wyniki numerycznej symulacji rozkładu prędkości powietrza zgadzają się z wynikami eksperymentalnymi mierzonymi za pomocą analizy obrazu cząstek. Przewidziane w wyniku analizy modelu średnice włókien, krystaliczność i dwójłomność zgadzają się z wynikami doświadczalnymi. Dlatego można wnioskować, że wyższa temperatura początkowa może prowadzić do cieńszych włókien, podobnie jak wyższa prędkość początkowa. Jak wynika z przeprowadzonej analizy, sposób rozwiązania tego zagadnienia może być pomocny przy projektowaniu procesu otrzymywania włóknin w systemie spunbonded.