Discussion
Injection moulding is suited to thermoplastics because the material can be
Answer: A
Correct answer: melted, forced into a cold mould and solidified
The cycle suits a thermoplastic exactly: the granules are melted in the barrel, injected under pressure into a cooled mould, allowed to solidify and ejected, and the process repeats every few seconds. Nothing is changed chemically, so scrap and sprues can be reground and used again. A thermoset requires a heated mould and a cure time instead, which is why it is compression or transfer moulded.
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