Daša Krapež Tomec, Matthew Schwarzkopf, Rožle Repič, Jure Žigon, Bojan Gospodarič, Mirko Kariž
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引用次数: 0
Abstract
This paper describes the development and characterisation of wood-filled polylactic acid (PLA) composite filaments for application in fused filament fabrication three-dimensional (3D) printing. Four different wood-polymer composite filaments for 3D printing were prepared, and specimens were 3D-printed with the obtained materials. The composite filaments consisted of wood particles (10% or 20% mass ratio) and a PLA polymer matrix. Wood particles were prepared by grinding and sieving non-modified beech wood and thermally modified (TM) (at 200 °C) beech wood. Thermal modification of wood affected particle preparation and smaller particles with lower aspect ratios were obtained. Filaments with TM wood particles were extruded better than with non-modified wood particles, with lower surface roughness and lower porosity. With a higher wood ratio, the surface roughness and porosity of the filament increased. Non-homogenous filaments also affected extrusion in 3D printing and reduced the properties of 3D-printed parts. Parts 3D-printed from filaments with TM particles had better tensile strength than from filaments with non-modified particles, but were lower than from pure PLA filaments. The tensile strength of the injection-moulded specimens was 18–69% higher than that of the 3D-printed specimens, depending on the filament composition. The results indicate some positive effects of thermal modification of wood particles on the properties of filaments and 3D-printed parts. Nevertheless, further optimisation of particle preparation and extrusion parameters is needed to obtain quality filaments with this size of wood particles.
本文介绍了用于熔融长丝制造三维(3D)打印的木质填充聚乳酸(PLA)复合长丝的开发和表征。我们制备了四种不同的用于三维打印的木质聚合物复合长丝,并用获得的材料进行了试样三维打印。复合长丝由木质颗粒(质量比为 10%或 20%)和聚乳酸聚合物基质组成。木质颗粒是通过研磨和筛分非改性榉木和热改性(TM)(200 °C)榉木制备的。木材的热改性会影响颗粒的制备,从而获得长径比更小的颗粒。与未改性的木材颗粒相比,使用热改性(TM)木材颗粒的长丝挤出效果更好,表面粗糙度更低,孔隙率更低。木材比率越高,长丝的表面粗糙度和孔隙率就越高。非均质长丝也会影响三维打印的挤出效果,并降低三维打印部件的性能。用含有 TM 粒子的长丝 3D 打印出的部件的拉伸强度优于未改性粒子的长丝,但低于纯聚乳酸长丝。注塑试样的拉伸强度比 3D 打印试样高 18-69%,具体取决于长丝成分。结果表明,木质颗粒的热改性对长丝和 3D 打印部件的性能有一些积极影响。不过,还需要进一步优化颗粒制备和挤压参数,以获得具有这种尺寸木质颗粒的优质长丝。
期刊介绍:
European Journal of Wood and Wood Products reports on original research and new developments in the field of wood and wood products and their biological, chemical, physical as well as mechanical and technological properties, processes and uses. Subjects range from roundwood to wood based products, composite materials and structural applications, with related jointing techniques. Moreover, it deals with wood as a chemical raw material, source of energy as well as with inter-disciplinary aspects of environmental assessment and international markets.
European Journal of Wood and Wood Products aims at promoting international scientific communication and transfer of new technologies from research into practice.