1. The raw material factor of ribbon the raw material of ribbon should first pay attention to whether the yarn used is from the same batch, because the "oil" of different batches of yarn is not the same, such as blending will become the factor of color in the dyeing process; Secondly, whether the raw material has been pre-treated or not, the dyeing and coloring effect of the raw material after refining treatment is very good, because after treatment, the "oil" on the yarn is removed and the dye can be directly dyed with the fiber, without protection.
2. Dyeing groove (also known as rolling car, dyeing cylinder, dyeing machine) the pressure size of the cylinders at both ends of the roll uniform factor The rolling car of continuous hot melt dyeing machine generally adopts pneumatic pressure, there is a cylinder on each side of the roll. When the rolling car runs for a period of time, due to the action of moisture in the compressed air, the pressure at both ends of the cylinder will be different, resulting in uneven liquid rate of the blank belt, and color difference in the edge. In addition, the roller pressure at both ends of the rolling car, produce a certain deflection, resulting in the edge of the rolling surplus rate is not consistent, will also cause left and right color difference.
3. In production, in order to minimize the impact of roller pressure on left, middle and right color difference, the general roller pressure should be controlled at more than 0.2 mpa when the ribbon is dyed. In the production process, due to the wear of the roll, it is required to calibrate and repair the roll regularly, otherwise it is easy to appear the inconsistency of the roll due to the different center of the roll. Roller with different hardness has different residual, too hard may lead to insufficient absorption of dye, too soft may lead to too large residual resulting in a large amount of dye swim and color, how much hardness should be determined according to the strip.
4. The influence of infrared pre-drying temperature on the ribbon polyester ribbon after pre-treatment and dip rolling dyeing process, before entering the color box generally after infrared (line) pre-drying treatment, in order to prevent the occurrence of dye swimming phenomenon in the drying process, avoid color flowers and positive and negative color difference and other defects. When the infrared pre-drying temperature is lower than 80℃, ribbon positive and negative color difference is large, it is difficult to meet customer requirements. When the infrared pre-drying temperature reaches more than 100℃, the positive and negative color difference of the ribbon is greatly improved. This is because the pre-drying reached more than 100℃, the moisture of the ribbon basically evaporated, greatly reducing the possibility of dye swimming. Considering dyeing production practice and energy consumption, it is more appropriate to control infrared pre-drying temperature between 100℃ and 150℃. The production is generally based on the thickness of the green belt and the liquid rate, the higher the liquid rate of the green belt, the higher the infrared pre-drying temperature. In actual production, we can not only rely on infrared pre-drying temperature to control the color difference between the positive and negative side of the ribbon dyeing, especially for coffee, dark green and other sensitive colors, we must use anti-swimming agent and other additives to achieve good dyeing effect.
5. Effect of baking oven fixing temperature on hair color Baking hair color is an important part of continuous thermal solution dyeing, the uniformity of baking oven fixing temperature plays a key role in controlling the left, middle and right color difference of ribbon. After the polyester ribbon is pre-baked by infrared ray and then entered into baking oven, the temperature must be consistent, otherwise it will produce obvious color difference. The experiment shows that the color of ribbon changes obviously when the temperature difference between right and left of baking oven is more than 2℃. Therefore, dyeing production must ensure that the baking oven temperature is uniform.
The influence of moisture content on the left, middle and right color difference of the ribbon Polyester filament in the spinning process will be added to a certain oil, so before dyeing to be treated with degrease. Webbing Slings Factory dyeing pretreatment is generally dried, and the uneven surface temperature of the drying cylinder will cause the difference in the moisture content of the green belt, and serious will cause the color difference between the left, middle and right of the ribbon. In the process of dyeing, in order to avoid the left, middle and right color difference caused by the different moisture content of the green belt, it is necessary to ensure that the green belt is thoroughly dried before dipping and rolling the dye solution, and the drying cylinder is regularly repaired.
7. Other factors producing color difference In terms of production management, there are mainly the following aspects that affect the left, middle and right color difference of polyester ribbon dyeing.
(1) Many differences in fabric structure, warp and weft density, warping tension and thickness will cause dyeing color difference. Due to the difference in production efficiency between looms and dyeing machines, the green ribbons produced by different looms are dyed in the same dyeing machine, and even the different batches of ribbons are dyed in the same dyeing machine. In order to minimize the influence of the quality difference of the green ribbon on the color difference of dyeing, it is required that weaving and dyeing must coordinate and coordinate the production plan, at the same time, do a good job in the inventory management of the green ribbon, and try to achieve "first in, first out".
(2) Machine management Baking oven should be repaired and maintained regularly to ensure the normal operation of heating equipment (such as heating tubes, combustion machines, etc.), normal temperature rise and temperature control. In the actual production process, it is necessary to keep the air duct in the box unblocked and the filter screen clean. The feeding device of dyeing machine is very important to adjust the tension of green ribbon. The tension of green ribbon should be basically the same before entering the dyeing tank, so as to ensure the consistency of liquid rate and color consistency. It is also important to control the tension that the dyeing machine exerts on the ribbon. Because the ribbon dyeing machine generally adopts frequency conversion control to adjust the tension of the whole dyeing machine, it is necessary to ensure the normal frequency conversion control signal of each process point, and to repair the failure device in time.
(3) The compatibility selection of dyeing materials with dyes has a great influence on the color difference between Webbing Slings Factory. Different formula production of the same color number, ribbon positive and negative color difference is larger. Generally, disperse dyes with the same or similar sublimation fastness and type (S, SE, E) are selected for compatibility, and the dyeing effect is better. In addition, the auxiliary use of anti-swimming agent, osmotic agent and levelling agent also plays a certain role in the control of dyeing color difference, but it should be used reasonably.
In summary, we need to pay attention to the following factors: (1) roll pressure, uniformity of color fixing temperature in baking oven, infrared pre-drying temperature, moisture content, mass concentration of anti-swimming agent and other factors will affect the color difference of continuous thermal solution dyeing of polyester ribbon. Generally, the roller pressure is 0.2 mpa, the temperature difference between left and right of baking oven is no more than 2℃, the infrared pre-drying temperature is 100℃, and the mass concentration of anti-swimming agent is no more than 15 g/L. The green belt should be fully dried after pre-treatment to effectively control the color difference of Webbing Slings Factory dyeing. (2) The quality of green belt, the management of machine and the formula of dyeing chemicals also have an important influence on the control of dyeing color difference. In the process of polyester ribbon hot melt dyeing, the consistency of ribbon quality should be controlled systematically, the maintenance and repair of the machine should be done timely, and the dye and auxiliary agent should be used rationally to obtain good dyeing effect
Post time: Jun-08-2022