Dyeing of cheese yarn is to wind the yarn on a bobbin with holes, and then load many bobbins into the dyeing vat. The basic operation flow of the cheese dyeing machine is: loose tube – cage loading – dyeing – drying – rewinding.
Differences in large and small samples of cotton cheese dyeing
Reactive cotton cheese dyeing is generally used In dye dyeing, there are many factors that affect the difference in the size of the cheese dyed yarn. For example, the performance of the dye directly affects the difference in the size of the sample. The winding process is closely related to the dyeing quality. The quality of the winding will also affect the quality of the dyeing. If it is bad, it is easy to have color difference between the inner and outer layers. The quality of the stainless steel core will also affect the dyeing effect. Due to the influence of these factors, the differences between large and small samples of cheese dyeing include inconsistent color depth and inconsistent shades; large samples are prone to flowery yarn phenomena, and even color differences between the inner and outer layers.
Differences in dyeing samples of pure cotton cheese
1 , Types of differences between large and small samples of cheese dyeing
A. The color and light are consistent but the shades are inconsistent
The large sample may be darker than the small sample Or light means that the color of the large sample and the small sample are the same, but the large sample is sometimes much darker than the small sample, but more often the large sample is lighter than the small sample. If the dyeing bath ratio of the large and small samples is different, the bath ratio of the small sample is larger and the bath ratio of the large sample is smaller. Then the color of the large sample will be darker than the small sample, otherwise the large sample will become lighter; the yarn cooking time will also affect the difference in depth between the large and small samples. If the time is short, the yarn will not be cooked thoroughly, and the color of the large sample will be lighter. On the contrary, if the time is too long, the color of the large sample will be lighter. , the yarn is cooked and the large sample is darker. Generally, yarn is boiled for 30 minutes; different dyeing times and temperatures for large and small samples will also affect the color depth.
B. Inconsistency of color and light
There is not much difference in the depth between the large sample and the small sample, but the color and light are very different. Big deviation. This has a lot to do with the choice of color-matching dyes. If the dye selected for the sample is unreasonable and has poor compatibility, it may not have much impact on the color imitation of the sample, but it will be clearly reflected when the large sample is produced. ; The process operation specifications of large-scale personnel will cause differences in color and light; different yarn counts and batches will also cause huge differences in size and color.
Dyeing of cheese yarn is to wind the yarn on a bobbin with holes, and then load many bobbins into the dyeing vat. The basic operation flow of the cheese dyeing machine is: loosening the tube – loading the cage – dyeing – drying – reversing the tube. Pure cotton cheese dyeing generally uses reactive dyes. There are many factors that affect the difference in size of cheese dyeing, such as the performance of the dye directly to the difference in size, the winding process is closely related to the dyeing quality, and the winding quality is good or bad. It will also affect the quality of dyeing, and color difference between the inner and outer layers will easily occur. The quality of the stainless steel core will also affect the dyeing effect. Due to the influence of these factors, the differences between large and small samples of cheese dyeing include inconsistent color depth and inconsistent shades; large samples are prone to flowery yarn phenomena, and even color differences between the inner and outer layers.
Types of differences in cheese dyeing samples
1. The color and light are consistent but the shades are inconsistent
Big Compared with the small sample, the sample is darker or lighter, which means that the color and light of the large sample and the small sample are the same, but the large sample is sometimes much darker than the small sample, but more often the large sample is lighter than the small sample. If the dyeing bath ratio of the large and small samples is different, the bath ratio of the small sample is larger and the bath ratio of the large sample is smaller. Then the color of the large sample will be darker than the small sample, otherwise the large sample will become lighter; the yarn cooking time will also affect the difference in depth between the large and small samples. If the time is short, the yarn will not be cooked thoroughly, and the color of the large sample will be lighter. On the contrary, if the time is too long, the color of the large sample will be lighter. , the yarn is cooked and the large sample is darker. Generally, yarn is boiled for 30 minutes; different dyeing times and temperatures for large and small samples will also affect the color depth.
2. Inconsistency in color and light
There is not much difference in the depth between the large sample and the small sample, but the color and light are very different. Big deviation. This has a lot to do with the choice of color-matching dyes. If the dye selected for the sample is unreasonable and has poor compatibility, it may not have much impact on the color imitation of the sample, but it will be clearly reflected when the large sample is produced. ; The process operation specifications of large-scale personnel will cause differences in color and light; different yarn counts and batches will also cause huge differences in size and color.
3. Flowers are easy to appear on large samples
There are no obvious flowers when dyeing small samples, but flowers will appear after dyeing large samples. There is color difference between the inner and outer layers; color difference between the two ends of the tube and the middle. The loose fibers must be caged evenly and tightly. Differences in tightness and uniformity will cause floral yarns to appear on the cylinder, and color differences will appear between the bobbin and the bobbin; the winding density of the rewinding package may be loose or tight, resulting in color differences between the inner and outer layers. This requires standardizing the operations of large-scale production personnel.
Factors affecting the difference in sample sizes for cheese dyeing
1. Skills of the operators on the vat Proficiency
If the technical level of the operator on the tank is insufficient, it will increase the possibility of color difference in the sample. Control the temperature, neither too high nor too low; control the time; the length of time should be reasonable and consistent with the sample process; the influence of boiled yarn quality, the boiled yarn must be transparent and even, and the wool effect must reach 8-10cm/30min , otherwise it will cause the dyeing color of the cheese yarn and the difference between the inner and outer layers, which will affect the one-time sample rate. After boiling the yarn, it should be pickled and neutralized to neutrality, and then use deoxidizing enzyme to remove the residue.��is serious. The length of synthetic fibers will shrink in hot water, which will also increase the density of the package. Some elastic yarns (such as spandex wrapped yarn) will also shrink violently in hot and humid conditions. All of these will destroy the original evenly wound bobbin. On the one hand, the density will become larger, and on the other hand, it will become uneven. As mentioned above, an increase in the package density will increase the filtration resistance, resulting in a smaller dye liquor flow, and aggravating the inner, middle and outer color differences.
8. The influence of bobbin diameter and its penetration rate
All data and a lot of practice show that the bobbin diameter has great influence It is conducive to leveling dyeing. High penetration rate is conducive to leveling dyeing. This is because:
(1) The diameter of the bobbin is large and the winding yarn layer is thin: the same winding amount, the diameter of the bobbin is large, and the The gauze layer is thin, this is an obvious fact. The yarn layer is thin, the filtration resistance of the dye liquor penetration cycle is small, and the flow rate is large, so the inner-middle-outer color difference is small. In addition, the thinner the yarn layer, the smaller the difference in winding diameter of the inner and outer yarns, the smaller the difference in streamline density, and the smaller the color difference between the inner and outer layers. The thinner the yarn layer, the shorter the time for the dye solution to penetrate, the smaller the dye degree difference along the process, and the smaller the inner-middle-outer color difference.
(2) The bobbin has high penetration rate and low resistance: the bobbin is full of holes, and the dye solution can only be redistributed to the inner layer of the yarn through these holes. For the dye liquor, these holes form local resistance and are part of the system resistance. The penetration rate is large and the resistance is small. On the contrary, the resistance is large and the flow rate is reduced, which will lead to inner-middle-exterior color difference.
9. The influence of dye properties and dyeing process
Whether it is the properties of the dye itself or the dyeing process parameters The settings will affect the dyeing rate (especially the initial dyeing rate) and the dye migration rate. When the dyeing rate is too fast and the dye migration rate is low, uneven dyeing will occur, that is, inner-middle-outer color difference.
10. Effects of improper use of softener after dyeing
Generally, the yarn will become astringent and hairy after dyeing, resulting in This process is difficult to carry out, especially for dark colors. For this reason, many manufacturers have added an “oiling” process, which is usually treated with smoothing surfactants, and some are treated with silicone. However, silicone will produce a “deepening” effect due to its low refractive index. If the “oiling” is uneven, that is, the deepening is uneven, it will also cause inner-middle-outer color difference.
11. Impact of water quality
When the package is dyed, the yarn on the package acts like a filter material. During the entire dyeing process, pre-treatment, dyeing, soaping, and cleaning fluids are penetrated and filtered thousands of times. When the water quality is poor, the impurity content is too high, there is rust and dirt in the pipeline equipment, or during pre-treatment, cellulose symbiotic organisms are in the pre-treatment liquid. Due to uneven dispersion, some impurities are deposited on the yarn, causing the inner layer to turn yellow. (Also available in yellowish brown). Rust (Fe2+, Fe3+) can be removed by treatment with oxalic acid and acetic acid. Therefore, soft water should be used for tube dyeing, and equipment pipes must be flushed.
12. The winding density of the bobbin is uneven
When the bobbin is wound, the radial density distribution is uneven and the inner layer is too Loose, so that the axial flow of the dye liquor increases, causing the inside to be deep and the outside to be shallow. </p
