Department of Production Engineering, KTH Royal Institute of Technology, 10044, Stockholm, Sweden.
Department of Machine Design, KTH Royal Institute of Technology, 10044, Stockholm, Sweden.
Sci Rep. 2022 May 9;12(1):7566. doi: 10.1038/s41598-022-11629-3.
The COVID-19 pandemic makes protective visors important for protecting people in close contacts. However, the production of visors cannot be increased greatly in a short time, especially at the beginning of the pandemic. The 3D printing community contributed largely in fabricating the visor frames using the rapid and adaptive manufacturing ability. While there are many open source designs of face visors for affordable 3D printers, all these designs fabricate mono-sized frames without considering diverse users' dimensions. Here, a new method of visor post-processing technology enabled by closed loop controlled 4D printing is proposed. The new process can further deform the printed visor to any customized size for a more comfortable user experience. FEM analysis of the customized visor also shows consistent wearing experience in different circumstances compared with the old visor design. The fabrication precision and time cost of the method is studied experimentally. A case study regarding the reducing, reusing and recycling (3R) of customized visors in classrooms is proposed to enable the customized visors manufactured in a more sustainable way.
新冠疫情大流行使得防护面罩对于保护密切接触者变得尤为重要。然而，面罩的产量在短时间内无法大幅增加，尤其是在疫情初期。3D 打印社区利用快速和适应性强的制造能力，在制造面罩框架方面做出了巨大贡献。虽然有许多适用于经济实惠的 3D 打印机的开源面罩设计，但所有这些设计都制造出单一尺寸的框架，而没有考虑到不同用户的尺寸。在这里，提出了一种新的基于闭环控制 4D 打印的面罩后处理技术方法。该新工艺可以进一步将打印好的面罩变形为任何定制尺寸，以获得更舒适的用户体验。定制面罩的有限元分析也表明，与旧的面罩设计相比，在不同情况下具有一致的佩戴体验。该方法的制造精度和时间成本通过实验进行了研究。还提出了在课堂中对定制面罩进行减少、再利用和再循环（3R）的案例研究，以实现更可持续的定制面罩制造方式。
