Discussion
Arrange the stages of making a moulded plastic article in order.
1. melt and shape it in a moulding machine
2. polymerise the monomer to resin
3. cool the article and trim it
4. compound the resin with additives
Answer: B
Compounding must follow polymerisation and precede moulding, since the additives have to be distributed through the melt. Cooling sets the shape and is the last step in the cycle. Cycle time is dominated by the cooling stage.
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