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SYSTEMS PREPARATION QUESTIONS 2007 - 10 |
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The toy train shown below has been manufactured using a plastic called HDPE High Density Polyethylene. The coupling rod is of great importance as it is linked to both of the main wheels |
The manufacturing process is called injection moulding. In the space below draw a labelled sketch showing this process. Add explanatory notes. |
NOTES |
ANSWER |
NOTES |
1. Granules of plastic powder (note the plastics listed
above) are poured or fed into a hopper which stores it until it is needed. 2. A heater heats up the tube and when it reaches a high temperature a screw thread starts turning. 3. A motor turns a thread which pushes the granules along the heater section which melts then into a liquid. 4. The liquid is forced into a mould where it cools into the shape (in this case a coupling). 5. The mould then opens and the coupling is removed. |
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