Ring dyeing
From Wikipedia, the free encyclopedia
Ring dyeing is a type of dyeing fault in which dyes are partially diffused to the interior of fibre.[1] Most dyes are stained on to the fibre surface that form layer of dyes on to fibre surface. Thus around the fibre a ring-like appearance of the dye can be viewed cross-sectionally. This ring-like dye layer opposes further dye diffusion. This problem leads to poor wash fastness and rubbing fastness of dyed fabric, as well as other staining-related fastness properties.
The dye particles are not penetrated uniformly throughout the fibre structure due to several reasons, like poor pre-treatment of yarn before dyeing, channeling of dye liquor circulation due to faulty loading of carriers with yarn wound packages, high density of packages (especially in cheese/cone dyeing), and many more.
Ring dyeing can happen by accident, but sometimes it is a desired effect sought out by dyers. One example of this is blue jeans (dyed with indigo) that are intentionally dyed so that the blue color will fade more quickly.[2][3]
