Usually in the production process of the dyeing factory, the dyeing process starts from the cloth input to the cloth output. It basically goes through four stages, one of the important links is the dyeing process, which in the south is called the dyeing process. So, where do these process curves come from?
The dyeing curve planning is divided into four sections
1. Basic time:
Do not reduce it. For example: constant temperature time, such as cotton dark color 60℃ × 60 minutes, 80℃ × 60 minutes, etc. polyester dark color Color: 130℃ o:p>
●That is, after the temperature is determined, it will not be reduced due to the fast cloth speed
●Basic time: The approximate time can be calculated from The book has deduced it, 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.
2. Critical time (period):
This period is the most It is easy to cause “color bloom” and the “critical temperature range” can be shortened or extended due to cloth length/cloth speed/dye/auxiliaries. For example: Polyester E-Type80-110℃Polyester SF-Type100-125℃●This range will Reduced (or extended) due to fast cloth speed
3. Cooling period:
Be careful to “prevent fabric creases” by fiber glass transition point but it is related to fabric length/fabric speed/for example polyester glass transition point 120-80℃ polyester first glass transition point 80℃ polyester second time The glass transition point is 120℃ and the nylon glass transition point is 70℃
●After the temperature area is determined, it can be reduced (or extended) due to the fast cloth speed
●The conversion point of synthetic fiber glass can be found in the fiber table, so you don’t have to worry about trying it
4. The rest of the time period:
Deduct the time other than the above ①②③ ● after the time period is determined, the rest may be reduced according to the heating or cooling speed of the dyeing machine.
How to measure the critical period and basic constant temperature time
We can Analyze the data provided by large-scale dye companies, or analyze the classification of dyes. However, not all the dyes we use are dyes from a single manufacturer. They may be several or not very large dye companies. They may not necessarily provide data. Although it is available, the parameters of each manufacturer are different, so in many cases we must find it ourselves. This testing method can be obtained from the laboratory. We call this method the step sampling method (StepDyeing). .
Segmented sampling 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% other combinations and so on)
(2) A single dye (you can also test a single dye 0.5% or 1.5% according to the % of the regular 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 1:8-25< Number of dye liquors to brew: 12+1=13 cups in total (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 0.6g/l sodium acetate with correct pH value must be added‥‥)
b. Calculate the liquid volume based on the liquor ratio. Use a balance to weigh one cup of dye solution and then weigh the next cup for a total of 12 cups (the last 13th cup of dye solution is discarded)
●Note: During 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℃ Heating up 1.0℃/min＞130℃×60 minutes＞Cooling ①70℃②80℃③90℃④100℃⑤110℃⑥115℃⑦120℃⑧130℃⑨130℃×20 minutes⑩130℃×30 minutes 130℃
★As soon as the temperature reaches the temperature, take out the jar 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 then put it into a new white cloth. Its purpose is to absorb the remaining dye. The method is: after 12 cups of residual liquid 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 real The temperature inside the cup is consistent with the real temperature.
Key periods and basic constant temperature time
Judgment: Cross-compare the “critical period” and “basic constant temperature time” with the absorption color sample and the residual liquid color sample
●When the residual liquid color sample becomes stable and no longer At the time of absorption, the dye is fully absorbed 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)
●FromCollect the color sample and observe it with the naked eye (or use a computer spectrometer) to absorb 70% of the dye. The period found is called the “critical time (period)”, of course, the first 15% and the last 15% are deducted
●The “critical time (period)” of the respective dyes should be obtained separately for the above. If the “absorption color sample and residual liquid color sample” of a group of dyes after testing are the same for each level of hue, Consistent, [or called critical time (period) it can be consistent] This is called “compatibility” and good. </p
