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. 2021 Aug 27;13(17):2877. doi: 10.3390/polym13172877

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© 2021 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).

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(a) Intense flash; (b) Wear observed in different sonotrodes used in UPMIM machines [102]; (c) A nodal point sonotrode (left) and a conventional one (right); (d) Nodal point ultrasonic micro-injection-molding configuration [130].