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PLASTICS - BATCH PRODUCTION - MANY MADE
V. Ryan © 2007 - 2009
Materials such as polystyrene, nylon, polypropylene and
polythene can be used in a process called injection moulding. These are
thermoplastics - this means when they are heated and then pressured in a
mould they can be formed into different shapes.
1. Granules of plastic powder (note the plastics listed above) are poured or fed into a hopper which stores it until it is needed.
3. A motor turns a
thread which pushes the granules along the heater section which melts then
into a liquid. The liquid is forced into a mould where it cools into
the shape (in this case a DVD storage unit).
4. The mould then opens and the unit is removed.
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