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Polylactic acid (PLA) filament, as shown, is a thermoplastic bioplastic extensively used as a feedstock material in 3-D printing - Leaving Cert Engineering - Question a - 2021
Question a
Polylactic acid (PLA) filament, as shown, is a thermoplastic bioplastic extensively used as a feedstock material in 3-D printing. (i) Explain the term bioplastic. ... show full transcript
Worked Solution & Example Answer:Polylactic acid (PLA) filament, as shown, is a thermoplastic bioplastic extensively used as a feedstock material in 3-D printing - Leaving Cert Engineering - Question a - 2021
Step 1
Explain the term bioplastic.
Answer
Bioplastics are plastic materials produced from renewable biomass sources, such as vegetable fats and oils, corn starch, woodchips, sawdust, and recycled food waste. Unlike conventional plastics derived from fossil fuels, bioplastics can be created from agricultural by-products and waste. Furthermore, bioplastics are biodegradable, meaning they can decompose naturally, thus addressing environmental concerns related to plastic waste.
Step 2
Name and explain a suitable polymer manufacturing process used to produce the polylactic acid (PLA) filament.
Answer
A suitable manufacturing process for producing PLA filament is extrusion. In this process:
- Granulated thermoplastic polymer is fed into a barrel from a hopper.
- The screw mechanism moves the polymer forward while heaters melt it into a liquid state.
- As the polymer is heated and continues to rotate, it is forced through a die, producing a continuous strand of extruded PLA filament, which can then be cooled and solidified.
Step 3
Give two reasons for the use of polylactic acid (PLA) in 3-D printing.
Answer
- Aesthetic Quality: PLA is ideal for 3-D printing where aesthetics are important, as it has a pleasing finish.
- Ease of Use: Due to its low warping tendency and compatibility with fine details, PLA is easier to print compared to other materials, making it suitable for intricate designs. Moreover, PLA is cost-effective and biodegradable, making it an environmentally friendly choice.