Cotton Knit Fabric Dyed with Natural Indigo and UV Protection

Oiytip Pupatana

Abstract


The main objective of this research were to 1) study knit fabric structure, physical propertiesand color values of cotton knit fabric structure undyed (white color) with the cotton knit fabric dyed with natural indigo and 2) compare the effectivenessin UV protection of cotton knit fabric structure undyed (white color) with the cotton knit fabric dyed with natural indigo. Physical properties tested stitch density, fabricthickness, bursting  strength, air permeabilityvalues were measured before and after washing, color values tested L* a* b* C* and h* valuesand  the effectivenessin UV protection of cotton knit fabric structure undyed (white color) with the cotton knit fabric dyed with natural indigo was then measured as follows: ultraviolet protection factor (UPF), percentage of  UVA and UVB transmittance, and percentage of UVA and UVB blockage values were measured before washing, after five washing and 10-hour  light  exposure in  both dry and wet conditions.It wasfound  that  the stitch densityvalues of  the cotton knit fabric dyed with natural indigo were a little greater than those of the cotton knit fabric structure undyed (white color) when measured before washing while their fabricthickness  values  of  the cotton knit fabric dyed with natural indigo were a higher  than those of the cotton knit fabric structure undyed (white color) when measured after washing while their bursting strength values of the cotton knit fabric structure undyed (white color) were a higher than the cotton knit fabric dyed with natural indigo when measured both before and after washing, and air permeability valuesthe cotton knit fabric dyed with natural indigoindigo were a higher than those of the cotton knit fabric structure undyed (white color) when measured both before and after washing.

It was also found that the cotton knit fabric structure undyed (white color) showed unprotect levels of effectiveness in UV protection when tested before and after laundering, light exposure in both dry and wet conditions. While the cotton knit fabric dyed with natural indigo, it was also found that showed very good to excellent levels of effectiveness in UV protection when tested before and after laundering, light exposure in both dry and wet conditions.


Keywords


UV Protection, Dyed with Natural Indigo, Cotton Knit Fabric

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SCIENCE  AND  TECHNOLOGY  RMUTT  JOURNAL
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Faculty of Science and Technology
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