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. 2019 Feb 12;9:1801. doi: 10.1038/s41598-019-38557-z

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© The Author(s) 2019

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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(a) A diagram of the device measuring the envelope-core adhesion. (Inset) A photograph of the composite yarn (sample No. 1) at the moment when the envelope was damaged: (1) a spring, (2) the yarn to be tested, (3) a ceramic wire, (4) a tension sensor, (5) the shaft of the winding device. (b) The measuring device at the moment when the nanofibre envelope was detached from the yarn core (sample No. 1). (c) The force values and standard deviation bars at which the nanofibre envelope was detached from the core yarn. Ten measurements were carried out for each of the samples No. 1–6. (d) A SEM microphotograph of knitwear made with a composite nanofibrous yarn indentical to sample No. 4.