Lightweight composite coil springs are still limited in their practical applications by costs of raw materials, resin impregnation and eco-environmental factors. Here, we fabricated a natural bamboo coil springs (BCS) via a facile hydrothermal-molding-fixing (HMF) treatment using moso (Phyllostachys edulis) bamboo slivers (BS). The BCS was superior to plant fiber-reinforced composite springs in terms of mechanical properties, dimensional designability and costs. The BCS basically inherited the cell structure and mechanical properties from natural BS, showing massive shrinkages of parenchymal cells and the occasional inter-fiber cells cracks, as well as the partial removal of lignin and hemicellulose after HMF treatment. Moreover, the BCS showed a stiffness retention rate of 86.3% after undergoing 8000 large-deformation compression cycles, demonstrating its high structural stability. The structure-function-compositions relationships of bamboo cells will help the design and manufacturing of curved bamboo furniture and structural bamboo coil springs for cushions application.

轻质复合螺旋弹簧在实际应用中仍然受到原材料成本、树脂浸渍和生态环境因素的限制。在这里，我们使用 moso ( Phyllostachys edulis ) 通过简便的水热成型固定 (HMF) 处理制造了天然竹螺旋弹簧 (BCS)) 竹条 (BS)。BCS 在机械性能、尺寸可设计性和成本方面优于植物纤维增强复合弹簧。BCS基本继承了天然BS的细胞结构和力学性能，实质细胞大量收缩，纤维间偶有破裂，HMF处理后木质素和半纤维素部分去除。此外，BCS 在经历 8000 次大变形压缩循环后，刚度保持率为 86.3%，表明其具有较高的结构稳定性。竹细胞的结构-功能-组成关系将有助于弯曲竹家具和用于坐垫应用的结构竹螺旋弹簧的设计和制造。