![]() Only Indigo dyeing requires multiple dye applications for a dark shade.Indigo dyeing is unique and because of the complex chemical reactions should be correctly viewed a a form of chemical engineering. ![]() Mercerizing is normally conducted at low temperatures, but hot Mercerizing can be employed for a more abraded appearance after garment laundering.Mercerized yarns are more ring-dyed and dye more darkly than non-Mercerized.Concentrations of sodium hydroxide more than 18% are not a solution, but a gel and are difficult to remove.If sodium hydroxide is on the yarn as it enters the Indigo tanks, the yarn color will change.When using strong sodium hydroxide it is important to remove all of it.Mercerizing is the use of strong sodium hydroxide (18-30%) to swell surface fibers. Hot causticizing improves colorfastness.Cold causticizing of cotton yarn results infaster Indigo dye fading from laundryabrasion, darker Indigo color with the same % of Indigo and unique washdowns.Causticizing generally refers to using sodium hydroxide at below Mercerizing concentrations (the bottom is normally dyed with sulfur blackĬotton fibers contain impurities like waxes, pectins and minerals that will interfere with Indigo dyeing and result in streaks.-Sodium hydroxide at low concentrations (85 C) in order to remove impurities and melt natural cotton waxes. sulfur bottoms were dyed using a combination of blue and black dyes Originally to produce a dark shade on denim using less Indigo for lower costs.Causticizing or Mercerizing Pre- Treatment : Sulphur Bottoming Pre-treatment is conducted in the 1st tank. Here are given some important dyeing processes related to indigo dyeing – specially on Rope Dyeing. ![]() This is a very technical description – read on if you are technically oriented.
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