Factors of the original webbing sling material The original webbing material must firstly pay attention to whether the yarns used are of the same batch, because the "oil" contained in different batches of yarn is different, such as blending, it will become a factor of the color in the dyeing process; secondly, the original material Whether pre-treatment has been carried out, the refining treatment of the original blank dyeing effect is very good, because the "oil" on the yarn after the treatment is removed, the dye can be directly contacted with the fiber and dyed without protection.
Dyeing tank or pad, dye vat, dyeing machine.The pressure of cylinders at both ends of the roll is uniform. The roll of continuous hot melt dyeing machine for webbing generally adopts pneumatic pressure, and there is a cylinder on each side of the roll.

When the rolling mill runs for a period of time, due to the action of the moisture in the compressed air, the pressure at both ends of the cylinder will be different, resulting in uneven liquid rate of the blank strip and color difference in the edge. In addition, the two ends of the roll of the rolling car are pressurized, which produces a certain degree of deflection, resulting in inconsistent rolling margin between the sides, and also causing color difference between the left and the right.The pressure, concentricity and hardness of the dyeing tank rolls are in production. If you want to minimize the impact of the roll pressure on the left, center, and right color difference, the roll pressure should generally be controlled above 0.2MPa during ribbon dyeing. In the production process, due to the wear of the rolls, the rolls are required to be calibrated and repaired regularly, otherwise it is easy to cause inconsistent rolls due to misalignment of the rolls and lead to inconsistencies.

Rolls with different hardness have different rolling margins. Too hard may result in insufficient dye absorption, and too soft may result in too large rolling margins and cause a large amount of dye migration to produce patterns. The hardness of the rolls is determined by the strip.The influence of infrared pre-drying temperature on the webbing. After the pre-treatment and padding dyeing solution process, the polyester webbing generally undergoes infrared line pre drying before entering the hair color box to prevent dye swimming during the drying process. Shift phenomenon, to avoid dyeing defects such as color blur and front and back chromatic aberration. When the infrared pre-baking temperature is lower than 80℃, the color difference between the front and back of the webbing is relatively large, and it is difficult to meet the customer's requirements.

When the infrared pre-baking temperature reaches above 100℃, the chromatic aberration phenomenon of the front and back sides of the webbing is greatly improved. This is because when the pre-baking reaches above 100℃, the moisture of the webbing is basically evaporated, which greatly reduces the possibility of dye migration. Considering dyeing production practice and energy consumption, it is more appropriate to control the infrared pre-baking temperature at 100℃-150℃. The production is generally determined according to the thickness and liquid rate of the blank belt variety. The higher the liquid rate of the blank belt, the higher the infrared pre-baking temperature. In actual production, you can't just rely on the infrared pre-bake temperature to control the color difference between the front and back of the ribbon dyeing, especially for sensitive color numbers such as coffee and dark green. It must be used in conjunction with anti-migration agents to achieve good dyeing results.