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Common Problems and Preventive Measures Before Printing and Dyeing

Common Problems and Preventive Measures Before Printing and Dyeing

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1.the hole
Cause:
(1) there are heavy metal ions in the working fluid.
(2) the fabric is exposed to iron in the process of reaction;
(3) there is rust liquid on the fabric.
(4) remnant iron scraps in water pipes, especially after a period of shutdown.
(5) the stabilizer used is not up to the requirements, or even fails.
(6) the content of metal ions in water quality has exceeded the standard (the standard is iron < 0.2mg/L).
Resolvent:
(1) if it is found before processing that there are embroidered stains on the grey fabric, wash with oxalic acid.
(2) regularly test the water quality. If the metal ions exceed the standard, it is necessary to change the water source.
(3) use excellent mixed (adsorption + complexing) stabilizer.
(4) use chemicals after filtration, put water in the water pipe when driving and dress gauze at the nozzle.

2. strong drop
Cause:
(1) improper proportion of alkali and oxygen consumption;
(2) too high alkali concentration leads to premature decomposition of hydrogen peroxide.
(3) the technology condition is not well controlled, which leads to the loss of equilibrium point for the two kinds of reactions.
(4) the steaming time is long.
(5) use over hot steam while steaming.
(6) failure in processing and too long parking time cause local brittle damage.
(7) stabilizer does not meet the requirements, fails or the dosage is insufficient.
Resolvent:
(1) the central rotation method is used to optimize the process. Reasonable process should be made according to the characteristics of the varieties, the requirements of customers and the quality of raw materials.
(2) strictly grasp the technological conditions, check and correct in time.
(3) if use superheated steam, it should be used after wet use.
(4) if you park too long on the way, you should put your guide belt in time or wash it.
(5) the use of excellent mixed stabilizers.

3. hairy effect is not high (cold dome)
Cause:
(1) the proportion of alkali and oxygen is not good enough, and the technological conditions are not well controlled, resulting in the removal of slurry and impurities.
(2) low liquid volume of alkali rolled strip needs passive coiling
(3) padding liquid when the liquid temperature is higher than that of cloth;
(4) after the cold reactor, the washing temperature is not consistent with the high temperature hot alkali treatment, and the washing is not enough.
Resolvent:
(1) optimize the technology, make reasonable technology; improve the rolling rate, and use the center roller to drive the coil automatically.
(2) impurities such as pulp, pectin and cotton wax must be removed.
(3) the pad fluid temperature must be lower than that of cloth.
(4) after cold reactor, it must be treated by high temperature and alkali treatment and then washed efficiently.

4. harsh handle
Cause:
(1) sodium silicate is used as stabilizer, and silicates on the fabric are not washed.
Resolvent:
(1) after rinsing, use 2 ~ 3g/L soda and lotion to wash at high temperature.
(2) reduce the consumption of sodium silicate and add silicon stabilizer.

5. unequal whiteness and lack of whiteness
Cause:
(1) the proportion of alkali oxygen is not good enough, and the technological conditions are not well controlled, resulting in the two kinds of reactions being out of balance.
(2) the concentration of hydrogen peroxide is too low.
(3) the time of stacking or steam evaporation is insufficient.
(4) using the passive way of beating the coil and using the heating pad after rolling, the temperature is inconsistent before and after, so that the effect is not consistent between the inside and outside of the rolls and the segments.
(5) uneven rolling of liquid and unevenly added liquid.
Resolvent:
(1) optimize the process and make reasonable process.
(2) strictly grasp the technological conditions, check and correct in time.
(3) adjust the concentration of alkali and oxygen in time;
(4) using the center roller's active driving way, if the heating reactor is placed, the temperature must be consistent before and after.
(5) increase the rate of rolling up, reduce the thickness of track box, and maintain the height of the lower water tank of the crawler.

6.wrinkle and transverse crumple
Cause:
(1) improper operation when rolling, especially when starting scrolls.
(2) wrinkles caused by uneven cloth.
(3) the cloth guide roller is not flat, and stained with dirt and thrum.
(4) plasma did not retreat net, when the preheating temperature does not reach the process requirements, processing of cloth guide roller is not flat, stained with dirt, yarn etc.
(5) when preheating, the direct steam pipe will rush towards the cloth surface and the steam will be too large.
(6) the liquid volume is not high, the caterpillar case is too thick, and the water level of the crawler tank is too low.
Resolvent:
(1) improve the operation level.
(2) strengthen equipment maintenance to ensure smoothness of roller and guide roller.
(3) remove the contaminants on the guide roll in time.
(4) strengthen the desizing, ensure the temperature during preheating, and those equipped with direct steam pipes can't rush to the cloth surface and control the steam consumption.
(5) increase the rate of rolling up, reduce the thickness of the caterpillar, and keep the water height of water tank under the caterpillar.
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