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The water dispenser shown has a detachable water bottle made from the thermoplastic Polyethylene terephthalate (PET), which can be replaced when empty - Leaving Cert Engineering - Question c - 2021
Question c
The water dispenser shown has a detachable water bottle made from the thermoplastic Polyethylene terephthalate (PET), which can be replaced when empty. (i) Describe... show full transcript
Worked Solution & Example Answer:The water dispenser shown has a detachable water bottle made from the thermoplastic Polyethylene terephthalate (PET), which can be replaced when empty - Leaving Cert Engineering - Question c - 2021
Step 1
Describe, with the aid of a diagram, a suitable polymer manufacturing process to make the water bottle.
Answer
The suitable polymer manufacturing process for creating the water bottle is blow moulding. This involves several steps:
- Parison Creation: An extruded plastic parison is formed and is clamped into the blow moulder.
- Air Injection: Air is blown into the heated chamber where the parison is located.
- Moulding: The pliable plastic takes the shape of the mould due to the air pressure.
- Product Removal: Once moulded, the finished bottle is removed from the mould.
Step 2
Identify and describe two polymer additives which may be used during the manufacturing of the water bottle.
Answer
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Stabilisers: These additives are incorporated to prolong the useful life of the polymer by protecting it from thermal and light-assisted oxidation. This ensures that the water bottle maintains its structural integrity and appearance over time.
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Plasticisers: These additives make the polymer more flexible, easier to mould, and non-toxic. They enhance the usability and comfort of handling the water bottle, contributing to its overall performance.