Discussion
Which of the following is a discontinuous polymer processing operation?
Answer: D
The discontinuous operation is thermoforming.
Thermoforming works cycle by cycle: a heated sheet is clamped, drawn onto a mould by vacuum or pressure, cooled and trimmed, and then the next sheet is loaded. Each part is made in a separate cycle, as in moulding.
Calendering, extrusion and film blowing are continuous: material is fed and product emerges without interruption as a sheet, a profile or a film tube.
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