Lupescu Deborah, Robert Mathieu, Elkoun Said
Department of Civil Engineering, Université de Sherbrooke, 2500 Boulevard de l'Université, Sherbrooke, QC J1K 2R1, Canada.
Department of Mechanical Engineering, Université de Sherbrooke, 2500 Boulevard de l'Université, Sherbrooke, QC J1K 2R1, Canada.
Materials (Basel). 2025 Aug 14;18(16):3821. doi: 10.3390/ma18163821.
This study investigates the use of a local fiber, specifically milkweed that grows in Quebec, Canada, for nonwoven building applications. Milkweed is a natural fiber with an ultra-lightweight hollow structure that provides excellent acoustic and thermal insulation properties. To provide three-dimensional stability to nonwovens, milkweed fibers were blended with a low-melt fiber composed of a polyethylene terephthalate core and a polyolefin sheath (LM 2.2), and polylactic acid (PLA) fibers. Several nonwovens with different fiber contents were manufactured using an air-laid Spike process. The nonwovens were compared with a commercially available thermal insulation material made of 100% hemp. The thermal conductivity and thermal resistance were measured at different temperatures. The sound absorption coefficient of the nonwovens was determined both using an impedance tube and the Johnson-Champoux-Allard (JCA) acoustic model. The results showed that all nonwovens exhibit thermal conductivity values below 70 mW/m·K at temperatures ranging from -4 °C to 24 °C, which are lower than many materials commonly used in building applications. A sample presented a thermal resistance that is 8%, 10%, and 45% higher than those of rock wool, polyisocyanurate (PIR), and fiberglass, respectively.
本研究探讨了一种当地纤维，特别是生长在加拿大魁北克的马利筋，在非织造建筑应用中的用途。马利筋是一种天然纤维，具有超轻的中空结构，提供优异的隔音和隔热性能。为了赋予非织造布三维稳定性，将马利筋纤维与一种由聚对苯二甲酸乙二酯芯和聚烯烃鞘组成的低熔点纤维（LM 2.2）以及聚乳酸（PLA）纤维进行了混合。使用气流成网Spike工艺制造了几种具有不同纤维含量的非织造布。将这些非织造布与一种市售的由100%大麻制成的隔热材料进行了比较。在不同温度下测量了热导率和热阻。使用阻抗管和约翰逊 - 尚波 - 阿拉德（JCA）声学模型测定了非织造布的吸声系数。结果表明，在 -4°C至24°C的温度范围内，所有非织造布的热导率值均低于70 mW/m·K，低于建筑应用中常用的许多材料。一个样品的热阻分别比岩棉、聚异氰脲酸酯（PIR）和玻璃纤维的热阻高8%、10%和45%。
