Eom Ran-I, Lee Hyojeong, Lee Yejin
Research Institute of Human Ecology, Chungnam National University, Yuseong, Daejeon 34134, Korea.
Dept. of Fashion Design & Merchandising, Kongju National University, Gongju, Chungcheongnam-do 32588, Korea.
Polymers (Basel). 2019 Sep 2;11(9):1438. doi: 10.3390/polym11091438.
Novel materials have been recently developed for coping with various environmental factors. Generally, to improve the thermal comfort to humans in cold environments, securing an air layer is important. Therefore, this study analyzed the thermal properties of 3D spacer technical materials, 3D printed using thermoplastic polyurethane, according to the structural changes. Four 3D spacer technical material structures were designed with varying pore size and thickness. These samples were moved into a cold climate chamber (temperature 5 ± 1 °C, relative humidity (60 ± 5)%, wind velocity 0.2 m/s) and placed on a heating plate set to 30 °C. The surface and internal temperatures were measured after 0, 10, 20, and 30 min and then 10 min after turning off the heating plate. When heat was continuously supplied, the 3D spacer technical material with large pores and a thick air layer showed superior insulation among the materials. However, when no heat was supplied, the air gap thickness dominantly affected thermal insulation, regardless of the pore size. Hence, increasing the air gap is more beneficial than increasing the pore size. Notably, we found that the air gap can increase insulation efficiency, which is of importance to the new concept of 3D printing an interlining.
最近开发了新型材料来应对各种环境因素。一般来说，为了提高寒冷环境中人类的热舒适性，确保空气层很重要。因此，本研究根据结构变化分析了使用热塑性聚氨酯3D打印的三维间隔织物材料的热性能。设计了四种具有不同孔径和厚度的三维间隔织物材料结构。将这些样品移入寒冷气候室（温度5±1°C，相对湿度（60±5）%，风速0.2 m/s），并放置在设置为30°C的加热板上。在0、10、20和30分钟后以及关闭加热板10分钟后测量表面和内部温度。当持续供热时，具有大孔隙和厚空气层的三维间隔织物材料在这些材料中表现出优异的隔热性能。然而，当不供热时，无论孔径大小，气隙厚度对隔热起主要作用。因此，增加气隙比增加孔径更有益。值得注意的是，我们发现气隙可以提高隔热效率，这对三维打印衬里的新概念很重要。
