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    The dyeing process is the center of controlling color difference
    Publisher：Jiangyin Haishibo Technology Co., LTD Release time：2025-02-13 13:32:29 Clicks：124 Close

    Jiangyin Heshibo Technology printing and dyeing equipment manufacturers share relevant knowledge today: the dyeing process is the center of the control of color difference: color difference, as the name suggests, is the difference of color. Printing and dyeing products will only be exposed to the problem of poor excellence through dyeing, it can be said that the dyeing process is the base of color difference, but also the center of color difference control. Therefore, we must concentrate on adhering to a careful and meticulous style, using scientific and reasonable methods to defend the base and control the center.
    ① Material preparation:
    A color, regardless of batch size, first requires the same batch, color light, the same concentration of dye. Otherwise, the formula should be readjusted when dyeing, and the sample should be put into production again.
    ② Weighing material:
    Due to the error of the weighing material caused by the color difference in the batch, it is the most unworthy of the printing and dyeing factory to make a low-level mistake, the reliable method is: the color separation weighing material, a special person review, and strictly implement the provisions of the use of the weighing machine in accordance with the size of the dye amount. To achieve heap accuracy.
    ③ Opening:
    The opening bucket capacity is best in 800-l000 liters each, each pad dyeing machine supporting three (live injection baking method can only open 300-500 liters per barrel), such as the use of active steam solidification method and Shilin dry reduction method, vulcanization and paint dyeing, when the batch of large colors, can open 2-3 barrels of dye liquid connected at the same time. This can reduce the color difference caused by the error of the dye or operation. In addition, after the barrel of dye is opened, the filter paper can be used to spot check and analyze the change of its diffusion degree and color light depth, as the final check before the dye dyeing.
    ④ Sample:
    The sample cloth of the pad dyeing sample is generally controlled about 20 meters each time, which can achieve the effect of both accuracy and no waste. The process and technical conditions of the sample (including pressure, speed, temperature, concentration) must be the same as that of normal production. In this way, the sample is accurate and the color difference will be reduced. When sampling, in addition to the adjustment of color, it should also be adjusted together with the left, middle and right color difference to the ideal level, so that the purpose of color accuracy and good edge color can be achieved when it is officially put into production.

    ⑤ Pre-drying:
    Whether it is infrared pre-drying or transverse roller pre-drying oven, the heating temperature of the fabric surface should be kept uniform, otherwise the dye will cause color difference with the swimming of water. In particular, whether the wind power of the pre-oven is evenly distributed should be formulated to strengthen the inspection system to prevent mistakes. In addition, conditional enterprises can install an online moisture meter in the pre-drying machine to check whether the dry humidity of the fabric pre-drying machine is consistent to prevent the color difference between the front and back caused by uneven drying and wet.
    ⑥ Steam box:
    The speed, temperature and concentration of the reduction steamer must be consistent. In particular, active vapor-solid liquid and caustic soda can not be separated from the reducing solution, practice has proved that color light is very sensitive to the concentration of caustic soda in the vapor-solid or reducing solution. In order to reduce the impact of caustic soda concentration error, the amount of caustic soda required for each color can be prepared once and used after titration accurately.
    The control of the temperature and pressure of the steam box can be specified to control the pressure and temperature meter monitoring of the steam entering the steam box. In addition, the steam box pressure U-tube can be installed on the wall of the steam box, and there is a specified control point for the level of the U-tube (that is, the pressure level of the steam box). Because the reaction of the U-tube is faster and more sensitive than that of the temperature meter and the pressure gauge, the temperature and pressure in the steam box can be controlled more accurately with the U-tube, and the color light before and after is more consistent.
    ⑦ Monitoring:
    With the continuous development of science and technology, monitoring instruments for edge color and LOT color are also increasingly developed. For example, the uniform rolling car is equipped with a computer, the automatic control of the left, right and middle rolling liquid rate, the measurement of online color difference and portable color meter, temperature automatic control, PH automatic control, etc. Conditional enterprises, gradually add some advanced and practical scientific and technological instruments, no doubt to reduce color difference is of great help. At present, the dyeing of most enterprises still depends on the strict check of employees and careful inspection to control. Each box of cloth should be cut sample to sample at least three times to check the change of color difference before and after. The dyeing machine should cut the cloth strip (generally 20cm wide), and then use the sewing machine to connect the left, middle and right sides together to check the edge color. Take measures to solve problems in time.
    ⑧ After finishing:
    After finishing of printing and dyeing fabrics, the color difference will be affected by the after-finishing additives. This must be paid attention to and prevented. Specific measures can be taken as follows; When pad dyeing the sample, according to the requirements of the variety after finishing, such as soft, sizing, waterproof, anti-fouling, coating, resin, etc., before cutting the sample, according to the requirements of the finishing before color matching. In this way, the defects of color accuracy and color light change of the machine after pad dyeing can be avoided. Therefore, the selection and formulation of finishing additives should be formulated by the matting supervisor. After dyeing, finishing the machine products also need to cut samples for color matching (color samples provided by the dyeing supervisor), and check the change of left, middle and right color difference of each box of cloth to achieve the purpose of preventing micro-gradually.
    ⑨ Inspection:
    The operation procedure of finished product inspection is: test → color separation → packaging. The inspection paper is mainly to check the appearance defects of the cloth and distinguish A and B cloth. Each volume is required to cut the first two 10cm cloth samples (one to the customer, one to keep the factory for reference). Color separation to designate a special person responsible, mainly according to the cloth strip color sample to distinguish a LOT of color and check the edge color. Only qualified products can be released.
    The packaging should be packed and stacked according to the LOT colors after the color separation, and the color labels in Chinese and English should be clearly distinguished, which is conducive to the color separation and cutting of the garment factory. Jiangyin Hisibo Technology Co., LTD www.haishibo.com
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