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1.The public moisture regain of ordinary polyester is very low, only 0.4, that is, one kilogram of dry polyester can only absorb 4 grams of water when it reaches the moisture absorption and dehumidification equilibrium under a standard environment (relative humidity of 65%, dry bulb temperature of 26 degrees Celsius). It absorbs and discharges the body surface, and the clothing is attached to the body, creating a feeling of suffocation. The official moisture regain of cotton is about 8.5, which is much higher than polyester, so cotton has better moisture absorption and air permeability than ordinary polyester.
2.But now there are a lot of functional polyester fibers, some of them use hollow structure, special-shaped cross-section, etc. to form capillary effect to drain the water and produce a cool feeling. This type of fiber is Coolmax, coolplus, Porel and other fibers, which are widely used in sportswear. And outdoor clothing. Among them, the fibers with special-shaped cross-sections are no longer cylindrical, but flat, with grooves on the outer surface. This type of fiber has developed from the earliest four grooves to the current six grooves, and the moisture transmission performance is improved. Some are graft-modified fibers, grafting some water-absorbing groups onto polyester fiber molecules, so that the water absorption of the modified polyester fiber is greatly improved. The fibers in this area include super-imitation cotton (super-imitation cotton is actually A modified polyester), some chemical fiber factories make super-imitation cotton with a regular moisture regain of 5% to 6%, so as to achieve the effect of moisture absorption and breathability. The breathability of this type of polyester is better than that of cotton.