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Wicking rate between 30% and 70% of maximum absorption capacity (Q2). 

Wicking rate between 30% and 70% of maximum absorption capacity (Q2). 

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Perceived moisture in shirt fabrics was determined using psychophysical methods and objectively measured moisture absorption behaviours. Four shirt fabrics were assessed: cotton; regular polyester; high-performance polyester; ahigh-performance polyester/polypropylene blend. After a screening test, six of 10 female subjects participated inthe determ...

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... absorption behaviour of the test fabrics was characterised ( Figure 4). Cotton absorbed water faster than the other fabrics at the moment of initial contact, but the rate slowed as the test progressed; the total absorbent capacity (i.e. the total water amount absorbed by the sample of cotton was the lowest. By contrast, the H. PET/PP fabric showed the slowest initial absorption rate, but the largest total absorbent capacity (V). The specific absorbent capacity ( C ) of the fabrics was also significantly different ( p 5 0.001, Figure 5); the H. PET/PP fabric had the highest absorbent capacity, while cotton had the lowest. The absorbent capacities of two 100% PET fabrics were between that of H. PET/PP and cotton; the H. PET fabric showed a slightly better absorbent capacity than regular PET ( p 5 0.05). Generally, in the demand wettability test, total absorbent capacity (V) is related to the apparent density (the weight per unit volume of a material including voids, g/cm 3 ). Cotton fabric had the highest apparent density, followed by the regular PET, H. PET and H. PET/PP fabric. The correlation coefficient between apparent density and absorbent capacity was 7 0.88. Because the thickness of the test fabrics in this study was controlled within a range (SD 0.017 mm), absorbent capacity was closely related to weight; the correlation coefficient between fabric weight and absorbent capacity was 7 0.85. Cotton had the highest initial absorption rate (Q 1 ), and the H. PET/PP fabric, the lowest (Figure 6), but the difference was not statistically significant. The initial absorption rate is closely related to the wetting time, which is determined by the hydrophilicity and topographical surface properties of the fabric (Yoo and Barker 2004). The slow initial absorption rate of H. PET/PP is due to the hydrophobic surface properties of the polypropylene fibres on the skin side of the fabric. The absorption rates between 30 and 70% of maximum absorption capacity (wicking rate, Q 2 ) were fastest for the two PET fabrics ( p 5 0.001, Figure 7). These wicking rates were a result of water in the intra/inter fibre pores; the driving force of the wicking absorption was capillary action rather ...

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