The matters needing attention in the continuous dyeing of ribbon:
Ribbon primary factor Ribbon primary should pay attention to whether the yarn used is the same batch, because the different batch of yarn contains "oil" situation is not the same, such as blending words will become the color of the process of the factors; second, whether the original billet was treated before, after refining the original color dyeing effect is very good, because the processing of yarn after the"Oil" is cleared off the dye can be directly with the fiber contact dye, no protection.
Dyeing groove (or rolling car, vats, dyeing machine) rollers at both ends of the cylinder pressure size uniformity of the continuous hot-dissolving dyeing machine with pneumatic pressure rolling, the rollers have a cylinder on both sides. When the rolling car runs for a period of time, because of the effect of the water in the compressed air, the pressure at both ends of the cylinder will produce a difference, resulting in uneven liquid ratio of the billet, resulting in the edge of the color difference.
In addition, the rolling mill rolls at both ends of the pressure, resulting in a certain deflection, resulting in the edge of the rolling residual rate is inconsistent, will also cause the left-right color difference.
Dyeing Groove roll pressure size and concentricity, hardness factors in production, want to roll pressure on the left middle-right color difference to the minimum, then ribbon dyeing general roll pressure should be controlled in 0. 2MPa or more. In the production process due to the wear of rolls, the need for regular calibration of the roll repair, otherwise easily due to the roll of different hearts and inconsistent results in the color.
Different hardness of the roll of the rolling residual rate is not the same, too hard may lead to absorption of dye is not sufficient, too soft may lead to too much of the yield of dye to produce a large number of swimming movement of color, how much hardness should be based on the need to decide according to the strip.
The influence of infrared baking temperature on the ribbon after pretreatment and dipping process, the polyester ribbon before entering the color box before the general to go through the infrared (line) pre-bake treatment to prevent the drying process occurs when the dye swimming, to avoid the color of flowers and the negative complexion and other dyeing defects. When the infrared baking temperature is less than 80 ℃, the ribbon positive and negative complexion is large, it is difficult to meet the requirements of customer use. When the infrared baking temperature reaches more than 100 ℃, the positive and negative complexion difference of the Ribbon is greatly improved. This is because the pre-bake to 100 ℃ above, the moisture of the ribbon is basically evaporated, greatly reducing the possibility of the dye swimming move. Considering the practice of dyeing and energy consumption, the temperature control of infrared 100℃-150℃ is more suitable. In general, according to the thickness and the liquid rate of the bloom belt, the higher the liquid rate of the billet, the higher the infrared baking temperature.
In the actual production, can not rely solely on the infra-red temperature to control the dyeing of the positive and negative complexion, especially coffee, dark green, such as sensitive color number, must use the help of anti-swimming agents and other auxiliaries to achieve good dyeing effect.
The effect of fixing temperature of baking oven on hair color baking hair color is an important part of continuous hot dissolving dyeing, and the uniformity of fixing temperature in baking oven plays a key role in controlling the left and middle right chromatic aberration of the ribbon. After the polyester ribbon is baked by infra-red and then into baking oven, it is necessary to ensure the temperature is consistent, otherwise it will produce obvious chromatic aberration. The results show that the temperature difference between left and right of baking oven is more than 2 ℃, and the color of ribbon is obviously changed.
Therefore, the dyeing production must ensure that baking oven temperature uniformity.
The influence of water content on the left middle right chromatic aberration of the ribbon polyester filament in the spinning process will be added to a certain oil agent, so before dyeing to go through the oil treatment. Ribbon dyeing before the general drying, and dryer surface temperature uneven will result in the water content of the gap, serious will cause the ribbon left and right color difference. In the process of dyeing, in order to avoid the difference of moisture content in the blank belt, it is necessary to make sure that the strip is thoroughly dried before dipping, and the drying drum is regularly overhauled.