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<p>Polylactic acid (PLA) has biodegradability, commendable heat resistance, luster, and excellent processability. However, the presence of numerous ester bonds, low strength, and slow crystallization in PLA limits its applications. This paper attempts to investigate the molecular structure and crystallization behavior of PLA and then optimize the conditions for melt-spinning monofilament to improve mechanical properties. A comprehensive examination of PLA was conducted from multiple perspectives. It was determined that the presence of low molecular weight and a narrow molecular weight distribution provided favorable conditions for the crystallization process. Special attention was also paid to controlling the spinning temperature and draw ratio under low-temperature and high-stretch conditions. By managing the spinning process, the production of metastable phases within 100% spun PLA fibers promoting their transition to a more tightly packed metastable state. These findings indicate that the PLA 6100D fiber has the greater breaking strength than PLA 6201D fiber. The maximum breaking strength of PLA 6100D fiber is 3.36&#xa0;cN/dtex due to its <i>α</i>' and <i>α</i> crystals coexist. Higher crystallinity and larger crystallite size, typically resulting from higher spinning temperatures or lower draw ratios, are associated with reduced breaking strength due to crystal coarsening and relaxation of orientation. Furthermore, the utilization of PLA 6100D fibers enables the production of tea bags application that exhibit exceptional mechanical properties, thermal stability, barrier properties, and permeability, so broadening the range of 100% PLA monofilament applications.</p>

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Optimized Production of 100% PLA Melt-Spun Monofilament for Fabric Type Tea Bag Application

  • 期刊论文

  • 发表日期：

    2026年3月3日

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  • Chi Deng,
  • Wei Li,
  • Jianyong Feng

摘要

Polylactic acid (PLA) has biodegradability, commendable heat resistance, luster, and excellent processability. However, the presence of numerous ester bonds, low strength, and slow crystallization in PLA limits its applications. This paper attempts to investigate the molecular structure and crystallization behavior of PLA and then optimize the conditions for melt-spinning monofilament to improve mechanical properties. A comprehensive examination of PLA was conducted from multiple perspectives. It was determined that the presence of low molecular weight and a narrow molecular weight distribution provided favorable conditions for the crystallization process. Special attention was also paid to controlling the spinning temperature and draw ratio under low-temperature and high-stretch conditions. By managing the spinning process, the production of metastable phases within 100% spun PLA fibers promoting their transition to a more tightly packed metastable state. These findings indicate that the PLA 6100D fiber has the greater breaking strength than PLA 6201D fiber. The maximum breaking strength of PLA 6100D fiber is 3.36 cN/dtex due to its α' and α crystals coexist. Higher crystallinity and larger crystallite size, typically resulting from higher spinning temperatures or lower draw ratios, are associated with reduced breaking strength due to crystal coarsening and relaxation of orientation. Furthermore, the utilization of PLA 6100D fibers enables the production of tea bags application that exhibit exceptional mechanical properties, thermal stability, barrier properties, and permeability, so broadening the range of 100% PLA monofilament applications.