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For any one of the plastic components shown below: (i) Name the process used to manufacture the component; (ii) Describe, with the aid of a diagram, the manufacturing process named in 5(a)(i) - Leaving Cert Engineering - Question 5 - 2010
Question 5
For any one of the plastic components shown below: (i) Name the process used to manufacture the component; (ii) Describe, with the aid of a diagram, the manufactur... show full transcript
Worked Solution & Example Answer:For any one of the plastic components shown below: (i) Name the process used to manufacture the component; (ii) Describe, with the aid of a diagram, the manufacturing process named in 5(a)(i) - Leaving Cert Engineering - Question 5 - 2010
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For any one of the plastic components shown below: (ii) Describe, with the aid of a diagram, the manufacturing process named in 5(a)(i).
Answer
Injection Molding is a process where thermoplastic is heated until it is soft enough to be injected into a mold. The thermoplastic is forced through an injection nozzle using a plunger. Once in the mold, it hardens rapidly, resulting in the desired shape. The diagram illustrating this process typically shows the injection nozzle, the heated thermoplastic, and the mold cavity. After cooling, the molded part is ejected from the mold. This method is advantageous for producing a large number of identical components quickly.
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State two safety precautions to be observed when filing acrylic sheet.
Answer
- Ensure the acrylic sheet is secured in a vice and does not project high above the clamping jaws to prevent accidental slips.
- Be careful not to exert too much pressure when cross filing to avoid cracking the acrylic material.
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Describe any three of the following terms associated with plastic technology: (i) Thermosetting plastic,
Answer
Thermosetting plastics are polymers that undergo a permanent change when heated, establishing strong cross-links between their molecular chains. They become rigid and cannot be remolded once they have set.
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Describe any three of the following terms associated with plastic technology: (ii) Elastic memory,
Answer
Elastic memory describes the property of certain thermoplastics to return to their original shape after being deformed when heated. This characteristic is particularly useful in applications where flexibility and shape retention are essential.
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Describe any three of the following terms associated with plastic technology: (iv) Former.
Answer
A former is a tool used in the manufacturing process which helps to retain the shape of a thermoplastic as it cools. It is crucial in processes like bending or shaping materials, ensuring they maintain the desired form until fully set.
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