Coloration, Tensile Strength, Bending Resistance and Waterproof of Fabrics Dyed with Persimmon Tannin Juice

Abstract

  The mechanism of coloration, tensile strength, bending resistance and waterproof of the fabrics dyed with persimmon tannin juice were investigated through colorimetry, spectroscopic method, tensile testing, canti-lever testing and spray testing. The test cloths woven of cotton, flax, silk, rayon, nylon and polyester were irradiated ultraviolet rays or heated after dipping into persimmon tannin juice. All of the test pieces were dyed with persimmon tannin juice and the greater the water absorption property of the fiber was, the deeper the test cloth was dyed. The cloths dyed under irradiating ultraviolet rays showed thinner color, higher reddish color and more yellowish color than the ones heated. It was inferred that such coloration of dyeing with persimmon tannin juice resulted from the change of the characters of the pigments and tannin of persimmon due to ultraviolet rays and heat. The tensile strength, bending resistance and waterproof property of the cotton cloth dyed with persimmon tannin juice were stronger, harder and greater than the ones before dyeing. It was considered that the tensile strength, bending resistance and waterproof of the fabrics dyed with persimmon tannin juice depended on the film of slightly soluble phlobaphene formed from tannin of persimmon. investigated