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AS-Level ­ Graphics ­ Injection
Moulding
Injection moulding is the manufacturing process that I will be focusing on. It is used for producing
parts from both thermoplastic and thermosetting plastic.

Injection moulding works on the plastic being fed into a heated barrel where it is then mixed and
forced into…

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Injection moulding machines consist of a material hopper, an injection ram or screw-type plunger,
and a heating unit. They are also known as presses, they hold the moulds in which the components
are shaped. Presses are rated by tonnage, which expresses the amount of clamping force that the
machine can…

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Injection-compression molding
Insert and outsert molding
Lamellar (microlayer) injection molding
Low-pressure injection molding
Metal injection molding
Microinjection molding
Microcellular molding
Multicomponent injection molding
Multiple live-feed injection molding
Powder injection molding
Push-Pull injection molding
Reaction injection molding
Resin transfer molding
Rheomolding
Structural foam injection molding
Structural reaction injection molding
Thin-wall molding…

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Molding Defects:

Blister - Raised or layered zone on surface of the part
Burn marks - Black or brown burnt areas on the part located at furthest points from gate or where air
is trapped
Flow marks - Directionally "off tone" wavy lines or patterns
Voids - Empty space within…

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