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Manufacturing Processes (Moulding (Injection Moulding (HOW IT WORKS
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Manufacturing Processes
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Moulding
Injection Moulding
HOW IT WORKS
Plastic powder is poured into a hopper, then the motor turns a threat which pushes the powder along heat, melting it so it can be molded and cooled into a given shape. The mold opens and the shape is removed
ADVANTAGES Complex shapes can be produced, it is very fast, little waste, little labor cost
DISADVANTAGES There is a high setup cost, and moulds are expensive
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Blow moulding
Used in the manufacture of bottles and containers, objects produced are usually hollow
HOW IT WORKS The plastic is fed into a hopper that stores it, and the plastic is then injection moulded and positioned. Air is forced into the mould, forcing the plastic to the sides, giving the shape.
ADVANTAGES Many types of plastic can be used, less expensive than injection moulding, fast method of producing hollow objects
DISADVANTAGES Limited to hollow objects, moulds can be expensive, Difficult to produce triangular shapes
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Dip moulding
What it is A simple and cheap method of manufacturing shapes where a shape is dipped into a melted plastic
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