In this study, the effect of layer thickness on the physicomechanical properties of the wood fiber–polylactic acid composite (WPC) part obtained by fused filament fabrication (FFF) was investigated. The results showed that most of the characteristics of the FFF-printed WPC part significantly depended on the printing layer thickness. As the layer thickness increased, the density of the printed WPC part decreased significantly, while the dimensional stability of the water-immersed WPC part decreased. In addition, specific tensile properties increased and the other specific mechanical properties (flexural, compressive, and shear properties) decreased with increasing layer thickness. Furthermore, scanning electronic microscopy micrographs illustrated that the number of voids and defects was more often observed on the surface of the WPC part printed with higher layer thickness. Therefore, these results indicated that the different layer thicknesses in FFF manufacturing have a substantial impact on the dimensional stability and specific mechanical properties of the FFF-printed WPC part.

中文翻译：

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熔丝法打印出不同层厚的单向绿色木纤维/聚乳酸复合材料部件的特性

在这项研究中，研究了层厚度对通过熔丝制造 (FFF) 获得的木纤维-聚乳酸复合材料 (WPC) 部件的物理机械性能的影响。结果表明，FFF 打印的 WPC 部件的大部分特性在很大程度上取决于打印层厚度。随着层厚的增加，印刷WPC部件的密度显着降低，而水浸WPC部件的尺寸稳定性下降。此外，随着层厚度的增加，特定的拉伸性能增加，而其他特定的机械性能（弯曲、压缩和剪切性能）降低。此外，扫描电子显微镜显微照片表明，在印刷层厚较高的 WPC 部件表面上观察到的空隙和缺陷数量更多。因此，这些结果表明，FFF 制造中的不同层厚度对 FFF 打印的 WPC 零件的尺寸稳定性和特定机械性能具有重大影响。