Discussion
Which screen aperture shape is best suited to separating on width rather than thickness?
Answer: C
Correct answer: Round perforations
A round hole passes a particle only if both its width and its thickness fit, and since width is the larger of the two it governs - so round perforations sort on width.
A slotted aperture is long in one direction, so a particle can turn edge-on and pass provided its thickness fits, whatever its width or length; slots therefore sort on thickness. Choosing the aperture shape is thus choosing which dimension the separation works on, which is why cleaners carry both types.
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