| 摘要 |
PURPOSE:To enable to efficiently remove stains from a fiber product for the bleaching thereof in spite of a continuous washing style washing machine having an interior stirring efficiency by treating the stains attached to the fiber product with an alkali solution containing a chlorinated isocyanuric acid in an amount of above a specific amount by the use of a continuous style industrial washing machine. CONSTITUTION:When a stained web is subjected to a stain-removing treatment using an aqueous solution containing a bleaching agent, the web is washed with a continuous style industrial washing machine using an aqueous solution containing chlorinated isocyanuric acid in an amount of >=50ppm as a residual chlorine concentration and adjusted to a pH of 8-12 with a metal salt such as an alkali metal hydroxide, alkali metal phosphate or alkali metal silicate as the bleaching agent, thereby permitting to extremely efficiently remove the stains from the web without the deterioration of the fiber web by the continuous style industrial washing machine having a physical stirring efficiency interior to conventional batch style washing machines and having an interior washing effect. The chlorinated isocyanuric acid is preferably dichloroisocyanuric acid salt and its hydrate, trichloroisocyanuric acid, etc. |
