A Sustainable Approach In Additive Manufacturing With Recycled ABS
Tandukar, Alisha (2020)
Lataukset:
2020
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Julkaisun pysyvä osoite on
https://urn.fi/URN:NBN:fi:amk-2020112624644
https://urn.fi/URN:NBN:fi:amk-2020112624644
Tiivistelmä
The objective of this thesis is to test suitability of recycled ABS in 3D printing and to find the effects of recycling on the mechanical properties of plastic filaments. It is well known fact that recycling usually effects on mechanical properties of material (Elina Iunolainen, 2017). To study the effect of recycling, various mechanical properties like tensile strength, young’s modulus and melt flow index are compared between virgin ABS samples and recycled ABS samples. Some fresh samples are first printed using virgin ABS filament. Another set of samples are prepared using recycled ABS. The recycling is done by using an extruder and shredder for at least 3 cycles. The extruded filament is then used to print recycled samples.
During extrusion of ABS samples, it was clear that there are high chances of contamination of plastic filaments with other impurities and moisture. Moreover, the extruded filament was very rough and had varying diameters. The extrusion temperature and extrusion speed were raised to obtain filament with smooth surface. The filament was dried at 80℃ for 20 mins to remove the moisture.
Tensile test showed that the Young’s modulus value for virgin ABS sample and recycled ABS sample are nearly equal i.e. 1.94 MPa and 1.88 MPa respectively. It is also seen that the stress and strain at yield value for virgin ABS sample and recycled ABS sample are nearly equal. But, virgin ABS sample undergo very long plastic deformation and absorbs large amount of energy before breaking than recycled ABS sample. Recycled ABS samples are strong and can handle same amount of stress as virgin ABS samples but cannot handle larger torsion or flexing.
The result of melt flow index test showed that virgin ABS has better flow properties than recycled ABS but the difference was fairly low even after third cycle.
During extrusion of ABS samples, it was clear that there are high chances of contamination of plastic filaments with other impurities and moisture. Moreover, the extruded filament was very rough and had varying diameters. The extrusion temperature and extrusion speed were raised to obtain filament with smooth surface. The filament was dried at 80℃ for 20 mins to remove the moisture.
Tensile test showed that the Young’s modulus value for virgin ABS sample and recycled ABS sample are nearly equal i.e. 1.94 MPa and 1.88 MPa respectively. It is also seen that the stress and strain at yield value for virgin ABS sample and recycled ABS sample are nearly equal. But, virgin ABS sample undergo very long plastic deformation and absorbs large amount of energy before breaking than recycled ABS sample. Recycled ABS samples are strong and can handle same amount of stress as virgin ABS samples but cannot handle larger torsion or flexing.
The result of melt flow index test showed that virgin ABS has better flow properties than recycled ABS but the difference was fairly low even after third cycle.