Online prediction of the filtration performance of polypropylene melt blown nonwovens by blue‐colored glow

Zhang, Haifeng; Liu, Jinxin; Zhang, Xing; Huang, Chen; Jin, Xiangyu

doi:10.1002/app.45948

Cited by 19 publications

(16 citation statements)

References 19 publications

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“…Helical structures, which are found in many natural systems such as plant tendrils and fine wool, have been of great interest due to the unique spring‐like constructions, arousing the exploration of preparing biomimetic materials by researchers. It has been known that due to their excellent properties attributed to the small diameter of the fibers, micro/nanofibrous materials have found applications in broad areas in recent years . It is therefore expected that designing materials by coupling helical structures with micro/nanofibers may open a promising market in a broad range of areas.…”

Section: Introductionmentioning

confidence: 99%

Fabrication of helical microfibers from melt blown polymer blends

Huang

Meng

et al. 2018

J Polym Sci B Polym Phys

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Helical fibers in micro/nanoscale resembling plant tendrils have been of increasing interest due to their unique characteristics. Fabrication of helical microfibers from polymer blends using melt blowing technique is reported in this study. An elastomeric and a stiff polymer are chosen as the raw materials, and a designed swirl-die melt-blowing device is used to prepare the microfibrous nonwovens. Focusing on the interfacial interaction between the polymer components induced by the polymer structure and intrinsic properties, airflow field characteristics, and processing parameters, we explore the effects of various parameters on helical fiber formation.Differential scanning calorimeter is employed to examine the rigidity of polymer chains, and the three-dimensional airflow field simulation is carried out to reveal the airflow field characteristics. This work can provide a promising technique for producing stretchable microfibrous materials which have potential applications in field such as filtration materials and oil sorbents.

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Section: Introductionmentioning

confidence: 99%

Fabrication of helical microfibers from melt blown polymer blends

Huang

Meng

et al. 2018

J Polym Sci B Polym Phys

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“…These results imply that the aging resistance and long-term stability of the filtration efficiency were enhanced by the cyclic charging technology; the decay of the surface voltage further confirmed this inference ( Figure 8 e). We confirmed that the filtration efficiency would reach a stable value when the charging time exceeded the threshold value because the traps were saturated with the increase in charging time [ 29 ]. We set the charging time to 40 s and excluded the possibility that the improvement in the filtration efficiency was due to the indirect increase in charging time.…”

Section: Resultsmentioning

confidence: 54%

Design of Polypropylene Electret Melt Blown Nonwovens with Superior Filtration Efficiency Stability through Thermally Stimulated Charging

et al. 2020

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Electret filters are widely used in particulate matter filtration due to their filtration efficiency that can be greatly improved by electrostatic forces without sacrificing the air resistance. However, the attenuation of the filtration efficiency remains a challenge. In this study, we report a novel strategy for producing an electret melt blown filter with superior filtration efficiency stability through a thermally stimulated charging method. The proposed approach optimizes the crystal structure and therefore results in the increased production probability of the charge traps. In addition, the re-trapping phenomenon caused by the thermal stimulation during the charging process can greatly increase the proportion of deep charge to shallow charge and improve the charge stability. A superior electret melt blown filtration material with a high filtration efficiency of 99.65%, low pressure drop of 120 Pa, and satisfactory filtration efficiency stability was produced after three cyclic charging times. The excellent filtration performance indicated that the developed material is a good air filtration candidate component for personal protection applications.

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“…The corona charge process makes the charged ions deposited on the electret material to form surface charges [31] and trapped inside the material to form space charges [32,33]. The space charge in melt-blown PP electret air purification material mainly comes from the capture of interface traps [34].…”

Section: Relationship Between the Filtration Performance And The Heatmentioning

confidence: 99%

The Effect of Temperature and Humidity on the Filtration Performance of Electret Melt-Blown Nonwovens

Liu

Dai

et al. 2020

Materials

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Electret melt-blown nonwovens are widely used for air purification due to their low pressure drop and high filtration efficiency. However, the charge stability could be affected by the ambient temperature and humidity, reducing the filtration efficiency, resulting in the electret melt blown filter not providing effective protection. Herein, we used corona charge to prepare electret melt-blown nonwovens and systematically studied the effects of different temperature and humidity on the structure, morphology, filtration performance, and surface potential within 24 h. The effect of treatment temperature and humidity on pressure drop was minimal because the fiber morphology and web structure of melt-blown nonwovens were not damaged. When the treatment temperature was lower than 70 °C, the effect on the filtration efficiency of the sample was small, but when the temperature increased to 90 or 110 °C, the filtration efficiency decreased significantly with the increase of the treatment time, and the surface potential also declined similarly. In conclusion, high temperatures will lead to charge escape and reduce the electrostatic adsorption effect. Furthermore, at the same temperature, increasing relative humidity can accelerate the charge release and make the filtration efficiency drop more. After the sample was treated at 110 °C and 90% relative humidity for 24 h, the filtration efficiency decreased from 95.49% to 38.16% at a flow rate of 14.16 cm s−1, and the surface potential dropped to the lowest value of −1.01 kV. This result shows that all links of electret melt-blown filter material from raw material to final use should be avoided in high temperature and high humidity conditions to ensure the protection effect.

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Online prediction of the filtration performance of polypropylene melt blown nonwovens by blue‐colored glow

Cited by 19 publications

References 19 publications

Fabrication of helical microfibers from melt blown polymer blends

Fabrication of helical microfibers from melt blown polymer blends

Design of Polypropylene Electret Melt Blown Nonwovens with Superior Filtration Efficiency Stability through Thermally Stimulated Charging

The Effect of Temperature and Humidity on the Filtration Performance of Electret Melt-Blown Nonwovens

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