Discussion
Chainless mercerising differs from chain mercerising in that
Answer: B
Correct answer: tension is applied by rollers
Chain mercerising grips the selvedges on a stenter chain and holds the fabric to width; chainless mercerising applies the tension through a series of driven rollers instead. The chainless machine is simpler and faster and avoids selvedge damage, but it can hold the *length* under tension rather better than the width, so it suits some constructions and not others.
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