Using PETG/rPET Blends in Fused Particle Fabrication: Analysis of Feasibility and Mechanical Behaviour

IF 1 Q3 ENGINEERING, MULTIDISCIPLINARY
Pelayo Fernández, Raúl Marqués, Natalia Beltrán, Blas Puerto, David Blanco
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Abstract

Additive Manufacturing (AM) production of plastic parts has experienced a continuous increase during the past decades. Simultaneously, advanced societies have become deeply concerned about the use of plastics and their impact on natural environments. As a result, there is a growing interest in recycled plastic as a feedstock material in additive manufacturing machines. However, the commercialization of recycled plastic filament introduces additional production and distribution steps. An alternative approach would avoid these steps by mixing recycled particles (obtained from local waste) with brand-new particles and using the resultant blend with Fused Particle Fabrication (FPF) machines, but some alimentary plastics, like Polyethylene Terephthalate (PET) have printability issues that hamper their direct use in AM. Present work analyses the feasibility of extruding blends composed of Polyethylene Terephthalate Glycol (PETG) spherical pellets and recycled Polyethylene Terephthalate (rPET) flakes so that local prosumers could give a second use to their own wasted water bottles. Additionally, tensile, and flexural specimens were analyzed for combinations of different rPET particle sizes and PETG/rPET blends (100%PETG, 30%rPET/70%PETG, 50%rPET/50%PETG, and 70%rPET/30%PETG). The experimental program included relaxation tests from which the relaxation modulus, E(t), was obtained. The results showed that the addition of PETG combined with a modification that insufflates pressurized air into the pellets inlet would permit to print blends up to a 70% rPET. It has also been found that an increase in the percentage of rPET causes a slight increase in the relaxation modulus of the test specimen. Finally, the viscoelasticity ratio remains nearly constant among the different blends whereas particle size has been found to have an influence on the results.
PETG/rPET共混物在熔融颗粒制造中的应用:可行性和力学行为分析
在过去的几十年里,塑料零件的增材制造(AM)生产经历了持续的增长。与此同时,发达社会已经开始深切关注塑料的使用及其对自然环境的影响。因此,人们对再生塑料作为增材制造机器的原料越来越感兴趣。然而,再生塑料长丝的商业化引入了额外的生产和分销步骤。另一种方法可以通过将回收颗粒(从当地废物中获得)与全新颗粒混合并使用熔融颗粒制造(FPF)机器混合来避免这些步骤,但是一些食用塑料,如聚对苯二甲酸乙二醇酯(PET)具有可打印性问题,阻碍了它们在AM中的直接使用。目前的工作分析了由聚对苯二甲酸乙二醇酯(PETG)球形颗粒和再生聚对苯二甲酸乙二醇酯(rPET)薄片组成的挤出混合物的可行性,这样当地的产消者就可以对自己的废弃水瓶进行第二次利用。此外,还分析了不同rPET粒径和PETG/rPET共混物(100%PETG、30%rPET/70%PETG、50%rPET/50%PETG和70%rPET/30%PETG)组合的拉伸和弯曲样品。实验程序包括松弛试验,从中得到松弛模量E(t)。结果表明,PETG的加入与向颗粒入口注入加压空气的改性相结合,将允许打印高达70% rPET的混合物。还发现,rPET百分比的增加导致试样的松弛模量略有增加。最后,不同共混物的粘弹性比几乎保持不变,而粒径对结果有影响。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Advances in Science and Technology-Research Journal
Advances in Science and Technology-Research Journal ENGINEERING, MULTIDISCIPLINARY-
CiteScore
1.60
自引率
27.30%
发文量
152
审稿时长
8 weeks
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