Discussion
Match the following:
| P. Plastic egg container | 1. Injection moulding |
| Q. Water tank | 2. Extrusion |
| R. Chair | 3. Rotational moulding |
| S. Cable | 4. Thermoforming |
Answer: D
The match is P-4; Q-3; R-1; S-2.
- A plastic egg container is a thin shaped sheet, made by thermoforming: a heated sheet is drawn over a mould.
- A water tank is large, hollow and seamless, made by rotational moulding, where powder is tumbled in a heated rotating mould.
- A chair is a solid, detailed, rigid part, made by injection moulding.
- A cable sheath is a continuous profile, applied by extrusion (crosshead extrusion over the wire).
The other options give water tanks to injection moulding, which cannot make such large hollow vessels, or cables to a batch process.
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