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What matters should be paid attention to when continuous ribbon dyeing? Hiro will explain it to you.

1. Ribbon original factor ribbon original first of all, we should pay attention to whether the yarn used is the same batch, because different batches of yarn containing "oil" situation is not the same, such as blending will become the color factor in the dyeing process; Secondly, whether the raw billet has been pre-treated or not, the dyeing effect of the raw billet after refining is very good, because after processing, the "oil" on the yarn can be removed and the dye can be directly in contact with the fiber, without protection.

2. Dyeing tank (or rolling car, dyeing tank, dyeing machine) roller cylinder pressure size uniform factor at both ends of the ribbon continuous hot melt dyeing machine rolling car generally adopts pneumatic pressure, roll on both sides of a cylinder. When the rolling car runs for a period of time, due to the role of water in the compressed air, the pressure at both ends of the cylinder will be different, resulting in uneven liquid rate of the blank belt, resulting in the edge color difference. In addition, the roller at both ends of the pressure, produce a certain deflection, resulting in the edge of the rolling residual rate is inconsistent, will also cause left, right color difference.

3. In the production, in order to minimize the influence of roll pressure on the left, middle and right color difference, the general roll pressure should be controlled above 0.2MPa during ribbon dyeing. Due to the wear and tear of rolls in the production process, it is required to calibrate and repair the rolls regularly, otherwise it is easy to lead to the uneven rolling residue due to the different core of the rolls. Different hardness of the roller obtained rolling residual rate is not the same, too hard may lead to insufficient absorption of dye, too soft may lead to rolling residual rate is too large resulting in dye to produce a large number of color, how much hardness should be decided according to the strip.

4. Influence of infrared predrying temperature on webbing Polyester webbing after pretreatment and dipping dyeing process, before entering the hair color box generally through infrared (line) predrying treatment, in order to prevent the occurrence of dye drift phenomenon in the drying process, to avoid color flower and positive and negative color difference such as dye defects. When the infrared predrying temperature is below 80℃, the color difference between the front and back of the ribbon is larger, it is difficult to meet the requirements of customers. When the infrared predrying temperature reaches 100℃ or more, the color difference between the front and the back of the ribbon is greatly improved.

This is because when the pre-drying reaches more than 100℃, the basic evaporation of the ribbon water, greatly reducing the possibility of dye swimming. Considering dyeing production practice and energy consumption, it is more appropriate to control infrared predrying temperature between 100℃ and 150℃. In the production, according to the thickness of the billet and the liquid rate of the billet, the higher the liquid rate of the billet, the higher the infrared predrying temperature. In actual production, it is not only possible to control the positive and negative color difference of webbing dyeing by relying on infrared predrying temperature, especially sensitive color numbers such as coffee and dark green. In order to achieve good dyeing effect, it is necessary to use anti-drift agent and other additives.

5. Effect of baking oven color fixing temperature on hair color Baking hair color is an important part of continuous hot melt dyeing, and the uniformity of baking oven color fixing temperature plays a key role in controlling the color difference between left and right ribbon. After the polyester webbed is pre-baked by infrared ray and then enters the baking oven, it is necessary to ensure that the temperature is consistent, otherwise obvious color difference will occur. The test shows that the temperature difference between the left and right sides of the baking chamber is more than 2℃, and the color of the ribbon changes obviously. Therefore, dyeing production must ensure that the oven temperature is uniform.

6. The influence of moisture content on the color difference between the left, the right and the middle of the ribbon Polyester filament in the spinning process will add a certain amount of oil, so before dyeing should be treated with oil removal. Ribbon dyeing before treatment is generally dried, and the uneven surface temperature of the drying cylinder will cause the blank with water content difference, serious will cause ribbon left and right color difference. In the process of dyeing production, in order to avoid the color difference between left, middle and right due to the different water content of the billet strip, it is necessary to ensure that the billet strip is thoroughly dried before dipping in the dye solution, and the drying cylinder is regularly repaired.

"Hongyang" brand polypropylene high strength yarn products have small color difference, good color fastness, high strength, and are widely used in decorative belts, safety belts, marking lines, etc.The company's main product:  polypropylene high strength yarn , polypropylene filament, polypropylene air change yarn，polyester air change yarn, ribbon.

Taixing Hongyang New Materials Technology Co., Ltd. has consistently adhered to the "excellent quality, customer first, quality service, adhere to the contract," the purpose, with high-quality products, good reputation, selling the country. Wholeheartedly with the domestic business win-win cooperation and common development!