I often see on clothes, bags, sheets, etc. a few % of polyester in the cotton cloth label. What does this mean and why do they do it? Are they weaving one out of every few strands out of polyester? Or is the fiber itself made of a few % polyester in composition? And what does it do for the cloth?
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Because poly is spun in long threads it allows for shorter cotton fibers to be used. 100% cotton threads need long fibers to make a strong, thin thread or you end up with lots of pilling (pilling is all those short ends that stick out getting rolled up together from friction). So it’s a cost effective measure, as well as reducing wrinkles and shrinkage that 100% cotton fabrics are prone to, as others have said.
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