1. There are several causes of holes caused in dyeing and finishing:
(1) It is acid The dosage of oxygenated water is too high;
(2) There are too many iron ions in the water quality;
(3) If the holes are regular, there is something wrong with the equipment;
(4) The “temperature + time” parameters are inappropriate;
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(5) Holes appear during bleaching, which in most cases are caused by the reaction between hydrogen peroxide and iron ions;
(6) The purity of hydrogen peroxide and alkali is excessive;
(7) Whether water softeners are added in pre-treatment and dyeing, and whether metal ions in the water may be used The content is too high;
(8) The hydrogen peroxide caused by heavy metal ions decomposes rapidly locally, causing holes.
2. Analysis of the causes of holes caused by hydrogen peroxide bleaching:
(1) Bleaching The front cloth is stained with oil stains of heavy metal ions such as copper and iron; or it comes into contact with copper, iron and other equipment during the bleaching process.
(2) The concentration of hydrogen peroxide is too high, the steaming time after bleaching is too long or superheated steam is used.
(3) If the gray fabric is mercerized before bleaching, due to uneven washing after mercerization, the PH value of the cloth surface will be too high and the alkali content will be excessive in some areas. .
(4) Improper selection of stabilizer or poor stabilizing effect of the stabilizer causes accelerated decomposition of hydrogen peroxide.
Each of the above points may cause holes in the fabric, but heavy metal ions are more harmful.
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