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Samples of water-logged needle-punched mats of hollow and solid polyester (polyethylene terephthalate) fibres and their blends are centrifuged and the amount of water retained was measured to evaluate the relative water retention in hollow and solid fibres. Different weight fractions of hollow fibres, nominally 0, 25, 50, 75 and 100%, were used and the effects of weight fraction of hollow fibres on the water retentions were determined. Theoretical analysis is presented to show that the ratio of water retention in hollow fibre to that of solid cylindrical fibres with equal linear density is proportional to , and for equal outside radius, it is proportional to , where k is the ratio of inside radius to outside radius of tubular fibres. With the increase of hollow fibres-weight fractions in the blends, water retention values increase according to the simple rule of mixtures.
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Rad et al. (2013) studied this question.
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