a) (i) Name any two of the plastic manufacturing processes shown at A, B and C - Leaving Cert Engineering - Question Question 1 - 2021
Question Question 1
a) (i) Name any two of the plastic manufacturing processes shown at A, B and C.
(ii) Describe, with the aid of a diagram, any one of the manufacturing processes nam... show full transcript
Worked Solution & Example Answer:a) (i) Name any two of the plastic manufacturing processes shown at A, B and C - Leaving Cert Engineering - Question Question 1 - 2021
Step 1
a) (i) Name any two of the plastic manufacturing processes shown at A, B and C.
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Answer
The two plastic manufacturing processes are:
Vacuum forming
Injection moulding
Step 2
a) (ii) Describe, with the aid of a diagram, any one of the manufacturing processes named by you at Q1(a)(i) above.
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Answer
Vacuum Forming
Vacuum forming is a process where a thermoplastic sheet is clamped in a frame and heated until it becomes pliable. It is then lifted into the plastic mould where vacuum pressure is applied to ensure the plastic sheet conforms to the shape of the mould. Excess material is trimmed away after cooling.
Step 3
b) (i) Name the type of plastic which softens when heated.
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Answer
Thermoplastics are types of plastics that soften when heated.
Step 4
b) (ii) Explain the term elastic memory.
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Answer
Elastic memory refers to the ability of a plastic to return to its original shape after being deformed. This means when the plastic is heated again, it will revert to its prior form, similar to smart materials.
Step 5
b) (iii) Name the type of plastic which remains hard after being heated.
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Answer
Thermosetting plastics are types of plastics that remain hard after being heated.
Step 6
c) Select any two of the household items shown below and name a plastic material which is suitable to produce each:
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Answer
Basin - Polypropylene (PP)
Shampoo bottle - Polyvinylchloride (PVC)
Step 7
d) State two safety precautions to be observed when using an adhesive to bond acrylic.
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Answer
Always work in a well-ventilated area.
Wear protective goggles/gloves to protect from adhesive sticking to the skin.
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