1. There are several reasons for holes in dyeing and finishing:
(1) The dosage of acid oxygen water is too high;
(2) There are many iron ions in the water;
(3) If the holes are regular, there is a problem with the equipment;
(4) The "temperature + time" parameter is improper;
(5) Holes appear in bleaching, most of which are caused by the reaction of hydrogen peroxide and iron ions;
(6) The purity of hydrogen peroxide and alkali is excessive;
(7) Whether water softener is added in pretreatment and dyeing, and the metal ion content in the water may be too high;
(8) The local rapid decomposition of hydrogen peroxide caused by heavy metal ions causes holes.
2. Analysis of the causes of holes caused by hydrogen peroxide bleaching:
(1) Oil stains with heavy metal ions such as copper and iron on the cloth before bleaching; or contact with copper, iron and other equipment during the bleaching process.
(2) The concentration of hydrogen peroxide is too high, and the steaming time after bleaching is too long or superheated steam is used.
(3) If the grey cloth is mercerized before bleaching, the PH value of the cloth surface is too high and the alkali content is locally too much due to the uneven washing after mercerizing.
(4) Improper selection of stabilizer or poor stabilization effect of stabilizer, resulting in accelerated decomposition of hydrogen peroxide.
The above points may cause holes in the cloth surface, but heavy metal ions are more harmful.
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