Single Covered Yarn For Knitting Leggings

Supply Ability

Supply Ability     40000 Kilogram/Kilograms per Month

Packaging & Delivery

Packaging Details   66cm*33.5cm*42.5cm

Lead Time:

Continuous pad dyeing has become the most popular and efficient ribbon dyeing process. So, ribbon dyeing should pay attention to what matters?

Ribbon continuous dyeing should pay attention to the main matters are:

First of all, pay attention to whether the yarn used is the same batch, because the "oil" of different batches of yarn 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, the dyeing effect of the refined raw billet is very good, because after the treatment, the "oil" on the yarn is removed and the dye can be directly dyed with the fiber, without protection.

2. Dyeing tank (or rolling car, dyeing tank, dyeing machine) rollers at both ends of the cylinder pressure uniform factor the rolling car of the ribbon continuous hot melt dyeing machine generally adopts pneumatic pressure, and there is a cylinder on each side of the roll. 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 color difference in the side. In addition, the rollers of the rolling car are pressurized at both ends, resulting in a certain deflection, resulting in inconsistent rolling residual rate in the side, and also causing left-middle right color difference.

3. In the production, in order to minimize the impact 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 of the rolls in the production process, it is required to calibrate and repair the rolls regularly, otherwise it is easy to lead to the color of the roll due to the inconsistency of the rolling balance. Different hardness of the roller obtained by the rolling rate is not the same, too hard may lead to insufficient absorption of dye, too soft may lead to the rolling rate is too large resulting in dye to produce a large number of color, how much hardness should be determined according to the strip.

4. The influence of infrared pre-drying temperature on the ribbon After the pre-treatment and dipping dyeing process, the polyester ribbon is generally treated by infrared (line) pre-drying before entering the hair color box to prevent dye migration in the drying process and avoid dye defects such as color flower and front and back color difference. When the infrared predrying temperature is lower than 80 ° C, the color difference between the front and back of the ribbon is large, and it is difficult to meet the requirements of customers. When the infrared predrying temperature reaches more than 100℃, the color difference between the front and back of the ribbon is greatly improved. This is because when the pre-drying reaches more than 100 ° C, the water of the webbing is basically evaporated, which greatly reduces the possibility of dye migration. Considering the dyeing production practice and energy consumption, it is more appropriate to control the infrared pre-drying temperature at 100℃-150℃. The production is generally based on the thickness of the billet variety and the liquid rate, the higher the liquid rate of the billet, the higher the infrared predrying temperature. In actual production, we can not only rely on infrared pre-baking temperature to control the color difference between the front and back of the ribbon dyeing, especially the sensitive color number such as coffee and dark green, and must use the anti-moving agent and other additives to achieve a good dyeing effect.

5. The influence 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 left, middle and right color difference of the ribbon. After the polyester ribbon is pre-baked by infrared ray and then enters the baking oven, it is necessary to ensure that the temperature is consistent, otherwise it will produce obvious color difference. The experiment shows that the temperature difference between the left and right side of the oven 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 left and right of the ribbon Polyester filament will add a certain oil agent in the spinning process, so it must be degreased before dyeing. Ribbon dyeing before treatment is generally dried, and the uneven surface temperature of the drying cylinder will cause the difference in moisture content of the billet, serious will cause the left, middle and right color difference of the ribbon. In the process of dyeing production, in order to avoid the color difference between left and right due to the different moisture content of the strip, it is necessary to ensure that the strip is thoroughly dried before dipping the dye, and the drying cylinder is regularly repaired.

7. Other factors that produce color difference In terms of production management, the main factors that affect the left, middle and right color difference of polyester ribbon dyeing are as follows.

(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 loom and dyeing machine, the blank strips produced by different looms are dyed in the same dyeing machine, and even different batches of webbing are dyed in the same dyeing machine. In order to minimize the impact of strip quality difference on dyeing color difference, it is required that weaving and dyeing must coordinate and coordinate the production plan, and do a good job in the inventory management of strip, and try to achieve "first-in-first-out".

(2) The machine management oven should be repaired and maintained regularly to ensure the normal operation of the heating equipment (such as the heating pipe, the burner, etc.), the 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. It is very important to adjust the strip tension of the dyeing machine, and the strip tension should be basically consistent before entering the dyeing tank, so as to ensure the consistency of its liquid carrying rate and thus ensure the consistency of color. It is also important to control the tension exerted by the dyeing machine on the webbing. Because the ribbon dyeing machine generally uses frequency conversion control to adjust the tension of the entire dyeing machine, it is necessary to ensure that the frequency conversion control signal of each process point is normal, and the faulty device should be repaired in time.

(3) The compatibility of dyestuffs with dyes has a greater impact on the color difference between the front and back of the ribbon. When different formulations produce the same color number, the front and back color difference of the ribbon is large. Generally, disperse dyes with the same or similar sublimation fastness and type (S, SE, E type) are selected for compatibility, and the dyeing effect is better. In addition, the auxiliary use of anti-swimming agent, penetrant and levelling agent also has a certain effect on the control of dyeing color difference, but it needs to be used rationally.

In summary, we need to pay attention to the following points:

(1) Roll pressure, uniformity of baking oven color fixing temperature, infrared predrying temperature, moisture content, mass concentration of anti-swimming agent and other factors will affect the color difference of continuous hot melt dyeing of polyester webbing. Generally, the roll pressure is 0.2MPa, the temperature difference between the left and the right of the baking oven is not more than 2℃, the infrared pre-baking temperature is 100℃, and the mass concentration of the anti-swimming agent is not more than 15 g/L; After pre-treatment, the strip should be fully dried to effectively control the color difference of the ribbon dyeing.

(2) Strip quality, machine management and dye formula also have an important impact on the control of dyeing color difference. In the process of hot melt dyeing of polyester ribbon, it is necessary to control the consistency of the quality of the strip, do the maintenance and repair of the machine in time, and use dyes and auxiliaries reasonably to obtain good dyeing effect.

Problems related to color
1. About color difference

Made samples and customer samples

Material and batch number: Reflective light

Differences in organizational form, degree of density

Dyeing process differences: methods, dyes

Dyed bulk and confirmed samples

Horizontal color difference between strips

Longitudinal color difference between each strip

Machine and its condition difference

Color difference between batches dyed