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Examination Question - Injection / Blow Moulding |
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V. Ryan © 2005 - 2009 | ||
The manufacture of a plastic bottle is shown below.
Each stage is described in detail. Study each stage and then attempt the
question paper. (PDF FILE -
CLICK HERE FOR QUESTION PAPER) |
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1. Granules of plastic powder (polystyrene, nylon, polypropylene and polythene) are poured or fed into a hopper which stores it until it is needed. |
2. The heater is turned on. This warms up and melts the granular plastic. A motor turns a screw thread which pushes the granules along the heater section causing it to change to a liquid. |
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3. The liquid plastic is forced into a mould by pressure. |
4. Pressurised air is ‘blown’ into the mould. This forces the liquid plastic against the sides of the mould. In this example it forms the shape of a plastic bottle. |
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5. The plastic is allowed to cool and the mould is ‘split’ and the plastic bottle removed. The entire process is repeated hundreds or thousands of times. |
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2a. Forming Plastics through Blow / Injection Moulding - Flow Chart Complete the following flow chart or draw a new version. |
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PDF FILE - CLICK HERE FOR PRINTABLE WORKSHEET | ||
Click here for specimen answer to flow chart question. | ||
3a. Explain why recycling is
important 3b. Draw a suitable recycling logo. |
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