About dyeing curves: We often see many dyeing curves in printing and dyeing factories. Today we will talk about what do these dyeing curves represent? In fact, it contains various reasons related to the dyeing curve (including segmented absorption sampling of dyeing machine cloth and dye).
▼Illustration of dyeing curve
1 The dyeing curve planning is divided into four blocks
①Basic time:
Do not reduce the time. For example: constant temperature time, such as cotton dark color 60℃ 135℃×10 minutes, 140℃×5 minutes, nylon dark color, 97℃×60 minutes, 105℃×40 minutes, etc.
●After the temperature is determined, the cloth will not run very quickly Fast and allows for reduction
●Basic time: The approximate time can be calculated from the book, but my ideas still need to be tested.
●We can use another term “necessary time” or “fixed time” to refer to this period of time.
②Key time (period):
This section is most likely to cause “color flowers““Key temperature range“ will vary depending on cloth length/cloth speed/dye /Auxiliary, the time can be reduced or extended. For example: Polyester E-Type80-110℃ Polyester SF-Type100-125℃
●This interval will be reduced (or extended) due to the fast cloth speed
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③ Cooling period:
Be careful through the fiber glass transition point “ to prevent fabric creases “ but it is related to the fabric length/fabric speed/for example polyester glass transition point 120-80℃ polyester first The secondary glass transition point is 80℃. The second glass transition point of polyester is 120℃. The second glass transition point is 70℃
●After the temperature zone is determined, the cloth can run very fast. Reduction (or extension)
●The synthetic fiber glass conversion point can be found in the fiber table, so you don’t have to worry about trying it
④Remaining periods:
Deduct the time other than the above ①②③
●After the time period is determined, the rest may be reduced depending on the heating or cooling speed of the dyeing machine.
2 How to measure the “critical period “And “Basic constant temperature time“
We can analyze it from the data provided by large-scale dye companies, or from the classification of dyes, but what we use Dyes are not all dyes from a single manufacturer. There may be several dye companies or dye companies that are not very large. They may not necessarily provide data. Even if they can provide data, the parameters of each company are different. Therefore, in many cases, we are bound to You have to find it yourself. This testing method can be obtained from the laboratory. We call this method the step sampling method (StepDyeing).
3 Step sampling method (StepDyeing) cup-dividing method
Disperse dyes : Glycerin color tester or infrared color tester : the most commonly used and plain texture (the type of cloth with the least impact on color judgment)
(1) When combining three dyes (the combination you want to test), for example, the light three primary colors are approximated to gray Y-0.1%R-0.1%B-0.1% (the dark three primary colors are approximated to brown Y-1.5%R-1.02 %B-1.0% and other combinations by analogy)
(2) A single dye (you can also test a single dye 0.5 % or 1.5% (% of the usual range) 5 (g) (or 10g) 24 pieces (or more) in total: 12 pieces for dyeing absorption and 12 pieces for residual liquid absorption : According to the factory’s regular liquor ratio of 1:8-25 : A total of 12+1=13 cups (an extra cup should be prepared) Prepare each cup of dye liquor
a. Prepare 13 cups at a time and mix them in a bucket (of course additives must be added, and the pH value must be controlled correctly. Sodium acetate 0.6g/l is required. Add…)
b. Calculate the liquid volume according to the bath ratio, and use a balance to weigh one cup of the dye solution before adding Weigh the next cup for a total of 12 cups (discard the last 13th cup of dye solution)
●Note: The weighing process Stir the dye liquid to be weighed at any time to prevent dye precipitation and obtain a liquid with uneven concentration :
25 ℃ (room temperature) × 15 minutes Constant temperature > Room temperature 25℃-130℃ Warming up 1.0℃/minute > 130℃ × 60 minutes > Cooling ① 70℃ ② 80℃ ③ 90℃ ④ 100℃ ⑤ 110℃ ⑥ 115℃ ⑦ 120℃ ⑧ 130℃ ⑨ 130℃ ×20 minutes ⑩ 130℃ × 30 minutes ⑾ 130℃ × 45 minutes ⑿ 130℃ × 60 minutes 115℃ Because the second glass transition point of 110-120℃ lasts for a special period, the sampling is dense.
★As soon as the temperature reaches the temperature, take out the cylinder cup and do a quick cooling at the same time > Take the color sample (we call it the absorption color sample )
★Discard the residual liquid and put it into a new white cloth. Its purpose is to absorb the remaining dye. , the method is: after the 12 cups of residual liquid cloth have been put in properly> put it into the color tester and dye it again at 130℃×60 minutes> take 12 color samples (we call them residual liquid color samples)
★In the process from 25-60℃, the temperature should be slowly raised at 1℃/minute to make the temperature in the real cup consistent with the real temperature.
4 “Key Period” and “Basic Constant Temperature Time“
Judgment: “Critical Period “ and “Basic Constant Temperature Time “ use absorption color samples and residual��Color sample cross comparison
●When the residual liquid color sample becomes stable and no longer absorbed, it means that the dye has absorbed enough and there is no need to extend the constant temperature. The “basic constant temperature time” “ can be obtained; (usually we will add 5-10 minutes for safety)
●The period of time when 70% of the dye is absorbed by visual inspection of the absorption color sample (or using a computer spectrometer) is called the “critical time (period) “ Of course it is Deduct the first 15% and the last 15%
●The above should be used to obtain the “
of the respective dyes. span>Critical time (period) “ If the “absorption color sample and residual liquid color sample” of a group of dyes after testing are consistent in each level of hue, [or called the critical time (period) it can Consistency] This is called “Compatibility“Good
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