Abstract
In melt blowing, high-velocity air impinges upon a polymer stream and attenuates it into micro-fibrous materials. The structure of the melt-blown die controls the airflow field and determines the process of fiber formation. This work focused on exploring the air swirling diffusion in a particular swirl-die melt blowing. The air swirling diffusion was analyzed by measuring the lateral velocity (vr), and the lateral twisting velocity (vs) by using single- and dual-wire probe hot-wire anemometer. Results showed that the vr had a diffusion boundary, while the distribution of the vs located out of the diffusion boundary of vr. The fiber paths in the swirl-die melt blowing, which was captured by high-speed camera, showed that the cone angle of the fiber path was consistent with the cone angle of vr-diffusion boundary. However, most of the twisting velocity (vs) located out of the region of fiber path, resulting in that the fiber helical motion was initiated just at a critical z-position, rather than in the region further away from the die. This work shows that energy-wasting of vs exists during swirl-die melt blowing, and a more optimized structure of this kind of die should be found.
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Acknowledgement
This research was supported by the National Natural Science Foundation of China (No. 11702113), China Postdoctoral Science Foundation (no. 2019M652075), the Open Project Program of Key Laboratory of Yarn Materials Forming and Composite Processing Technology, Zhejiang Province, Jiaxing University (No. MTC2020-15), and National Innovation Project for College Students (No. 201910354030).
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Zhu, B., Xie, S., Han, W. et al. Swirling Diffused Air Flow and Its Effect on Helical Fiber Motion in Swirl-Die Melt Blowing. Fibers Polym 22, 1594–1600 (2021). https://doi.org/10.1007/s12221-021-0809-0
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DOI: https://doi.org/10.1007/s12221-021-0809-0