Colorimeter on the process of dyeing color, color bar, color flower control
Abstract: In the process of dyeing (medium dark color), the color difference in the edge and the chromatic aberration in front and back, the color bar and the streak are easy to appear. This is a difficult point to improve the product quality and the production efficiency of the color mat. Through a large number of production practices and a reasonable production process, Additives to solve the above difficulties can effectively improve product quality, and energy saving.
I. Preface: With the substantial increase in the export of Chinese apparel fabrics and the intensified commercial competition, the customers' requirements on the color, color, color and fastness of fabric for export are very strict nowadays. Therefore, the accuracy and stability of the color of the dyed fabric are improved. Out of the fabric fullness, uniform, consistent color, consistent dimensional stability of the product quality is an important factor to meet customer requirements, but also to win customers based on the market undefeated key, so I want to pass a large number of production practices, how to prevent staining In the process, color bar color flower talk about experience.
Second, the impact of semi-finished products,
In the process of producing dyed cloth, the performance of the semi-finished products is very important for the color consistency, color stability and color difference adjustment of the color fabric. The semi-finished products are required to be uniform, the concepts of whiteness and gross efficiency are vague, and the quality is not easily noticeable. Semi- A slight change, when the color can be reflected in the color. In the production of some large volume of the invoice, even if the same species, may also be due to the origin of the procurement of gray fabric, sizing and sizing different, different quality cotton, with different cotton, and different production processes, so that semi-finished products of different qualities in the production In the process to check the roundabout, the timely determination of bleaching process, the same process, to take a large number of sample production, the gap between the timely adjustment of prescriptions to avoid changes in the production before and after the color head, resulting in repairs and consumption increase, as Reduce due to semi-finished products on the dyeing rate of dyeing, bleaching should develop a reasonable process. For the same variety of cloth, especially the single-return, scheduled machine, mature production technology, improve the original single-recapitulation.
Third, the impact of dyeing process
1. Dyes, additives, the choice of the impact of color
One. The use of Shihlin dye dyeing, as a result of individual dyes in the dye tank slow rate of deposition, and deposition, resulting in chromatic aberration before and after, leaving the shade, and gradually uptake rate of the dye color is slowly rising, resulting in chromatic aberration, such as the production of olive green Shihlin yellow, in order to stabilize the shade, we take Shihlin olive green or grass green instead of yellow, in addition to prevent the yellow material deposition, but also can be added to the dye dispersant, so that material tank, trough more uniform dye does not occur Accumulation, can effectively improve color, and reduce costs.
Bay reactive dyes, reactive dyes because of the higher reactivity, and the larger the gap between the dye performance, continuous pad dyeing, shade difficult to control, easy to produce before and after the color difference, so the dye should be used in the production of the same or close compatibility dyes, Compatibility of dyes refers to spell color when using a group of dyes in the fiber diffusion speed and dye affinity of the fiber size difference. The difference is small, indicating compatibility is good, otherwise the compatibility is poor. Affinity is expressed as the rate of dye transfer from the dye to the cotton fiber.
Affinity determination generally use two methods,
(A) Measured hair value, the dye solution in the dye rate of rise and height, the height of the inconsistency, the highest affinity lowest.
(B) filter paper Halo method, the dye droplets in the medium speed filter paper to observe the proliferation of dye in the above, the penetration of diffusion in the outer ring affinity low.
Low dye affinity, good diffusion, low direct, slow dye uptake, easy to produce migration, resulting in poor color fastness, fastness than the value of the RF high. The use of dye affinity is too low, when drying swim shift, fabric color is not full, poor color fastness,
Dye with high affinity, poor diffusibility, high direct, fast dyeing speed, easy to test the color is not allowed, the formation of color before and after the color is not conducive to shade control, the ratio of the RF low, affinity dye is too high, The impact of surface changes is not conducive to the continuous production of shade control, production instability. Therefore, the choice of active material, not only to take into account the dye compatibility, but also the choice of moderate affinity Rf value of 0.6 ~ 0.8 for the best. Rf = hydrogen dye / H water ≤ 1 Generally, the ratio of dye to water ascended in medium-speed filter paper within 5 minutes after the dye concentration of 10 g / L at room temperature was measured by the filter paper ascending method.
Corner of the choice of additives on the edge of color, and the impact of streaks
Adding appropriate additives, can effectively improve the color and strip caused by the fabric, equipment and other reasons, but sometimes add some additives, can only solve the problems on the one hand, and can not solve many problems such as color bars, At this point, re-use of dyes based on the use of better additives to produce customer satisfaction products, for example, we add in the production of anti-migration agent, which can improve due to wind room, drying temperature uneven Dye migration, is conducive to the adjustment of color, but it can not effectively improve the fabric defects, cotton miscellaneous, nep, dead cotton, woven strips and other defects, the fabric looks very uneven, not full, so the quality of the fabric Weakness, we use the leveling agent, the effect is better, but the use of leveler and the emergence of a problem is poor color adjustment than the use of anti-migration agent, in the same conditions, the edge of the color difference, for example, production T / C gray, adding anti-migration agent, color is better, but the cloth is not good, we try leveling agent, the cloth is good, but the color difference is sometimes poorly adjusted, which we can choose according to the gray dispersion Two kinds of gray or dispersion formulation, so that color control to achieve 4.5
2. Base technology on the color, strip, the impact of color
Due to the different RF values, dyes have different affinity to fiber because of high affinity, high dye uptake rate and low affinity, which leads to the difference of the dye components in the dyeing solution when the dyes are mixed together, Resulting in head and tail color, when constantly added to the tank after the dye solution, dye tank dye components will gradually reach a dynamic equilibrium, then gradually stabilize the color head, which is caused by the trial color is not allowed, and the beginning of the car head The main reason for instability, the shades of light, the longer the time to reach equilibrium, the deeper the color to reach the balance of the shorter, the rolling capacity should be small and easy, so that the dye in a relatively short period of time to achieve balance, which will help shade stable , In order to compensate for the beginning of car color, we can use, dilute or add lake method to solve the problem, such as the production of light blue, light color, with the staining, the light shades more shallow, the red light, we can begin Driving trough dilute, so the end of the color difference, and in the production of deep blue, the use of color in the lake, to solve the color before and after, we produce the bottom equipment is divided into three parts, infrared, , Dryer, three parts, infrared effect is good, dye migration to small, good color, the amount of drying room to moderate, the temperature is too high can cause streaks, the temperature is too low to increase the drying load, and the first in the 60 - 70 ℃ is good, the second in the 90-100 ℃ is conducive to leveling.
Dryer is an auxiliary equipment, but can not directly dry the fabric, so direct contact with the fabric will cause dye migration serious, not only the formation of yin and yang, but also cause the illusion of color, is not conducive to the rolling adjustment of color, Dried up, can not be too hot. For example, the production of Brilliant Blue or gray, the color light sensitive, due to the drying temperature is too high, the drying cylinder temperature is not the same side, the middle temperature is high, the dye hair, and the low temperature on both sides, no hair, the formation of visual artifacts, In the middle of hair color, deep blue green light, while the edge of red light, if the wrong view, the middle of the deep and pressure, shallow pressure on both sides of the knife, the color more and more heavy, which not only requires the file car workers, experience accumulation, but also Some knowledge of the dye performance, for example, in the production by the blue, the drying part of the hair color, when the end of the adjustment of color depth of about the same time, continuous machine color 2-3 level, when the end of the adjustment of the left and right shade close to see Go up to the middle of the deep, continuous machine color 4-5 level, so in order to avoid uneven hair color drying, difficult to adjust the color difference, fall cloth should be dry-based, fall cloth can not be too hot.
3. Baking machine color, color flowers
Most of the existing domestic equipment is the old equipment of the 1980s. Due to the uneven air volume of the circulating fan equipment and the large volume of the cabinet, the difference between the temperature in the cabinet and the ambient temperature is large, so that the temperature difference in the middle of the cabinet is larger, which is the main reason for the color difference , So you can adjust the tuyere air flow, azimuth to improve edge color, the other can adjust the bottom rolling pressure to make up for the curing temperature difference caused by the edge, the production process to adjust the temperature to be consistent and stable, to prevent the appearance of color.
4. Color soap cook on the impact of color
Restore the steam temperature in the production of the temperature should be above 100 ℃, and the pressure is uniform, or the effect of reducing the effect of bar, through the cabinet installed ü type pressure gauge, steam pressure control the same cabinet, intuitive and accurate, but also to prevent the material In normal production, the trough and liquid seal trough should be based on different fabrics, different shades of different colors, adding the right amount of Lake to prevent the car at the beginning, and the normal production of dye concentration in the tank changes, because in the production of padding fabric to the dye, continue to be re-shedding solution into the liquid sealing liquid, and then from the liquid seal again Dye to the fabric, and only shedding material re-dyed fabric to the same amount of dye, the trough in order to achieve a dynamic balance, when the vehicle speed, temperature and steam pressure changes, the balance will have fluctuations caused Before and after the color.
Production of washing, overflow, and the size of the spray on the stability of shade also has a very important influence, especially reactive dyes, due to poor fastness, the size of the water also affects the water seal, the alkaline environment, and dye content , So that continuous color light changes
Soap boiling effect, the purpose of soap cooking, one is to remove the floating color on the fiber, the second is to make the state of the dye dyed on the fibers more stable, good color fastness, after soaping, the color fastness increased, The color will change, while the other soaping conditions on the impact of certain colors is very large, the production of these colors must pay special attention to the same conditions of soap cooking.
For example, the production of blue, dark blue, blue and other series of blue, because the blue material does not soap better fastness dye, so the choice of good fastness dye production on the color head stability is very important. Therefore, changes in soap cooking conditions, the impact of these colors is very large, as well as the production of lotus purple, after a number of prescriptions compared to use the test color change the smallest normal shade, prescription color swatch during the production process is still volatile, after several Explore and summarize the law of production changes can effectively solve the production of color head changes, in short, is to keep the process consistent production.
The following summary Lin lotus in the production process impact
First, first of all, the impact of speed, the faster the speed, the greater the red, the slower the speed, the greater the blue light
; B baking temperature, T: 195 ℃ color, color shade ideal, stable, the higher the temperature, the greater the blue light, the lower the temperature the greater the red
Corner continuous shower overflow colored hair shallow, blue light
Shower overflow overflow, dark hair, red big
d. Soap cooking, washing grid temperature, the maximum shade, the temperature at 90 ℃, the soap cook small head, color light stability, the temperature is lower than 80 ℃, the next machine deep and blue, soap cook big head, twice Sohu after cooking big red
When the temperature is higher than 96 ℃ continuous under the machine color head light red and red, soap cook small, secondary soap cook the same head,
That is, solid material, the same approach, concentration, temperature, alkali content determination to be consistent
5. finishing process on the color, color flower
First, finishing auxiliaries to use a small change of color additives, because the greater the change in the production of the greater the impact of conditions, the production process is not stable, will affect the consistency before and after the shade, and the edge color,
Bay finishing equipment is a new car, with drying room, parking, and speed instability, the color head changes, and sometimes also affect the edge of the color difference, widen the tide is inconsistent, resulting in color, pre-drying left and right after the dry tide inconsistencies also caused by the edge In color,
Corner selection of additives can not increase the fabric defects,
Adding pulp will increase pendants, a good slurry additives, will improve this phenomenon
A good softener can improve the streaking of stained cloth so that the cloth is full and the gloss is better.
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