Yarn dyeing process is same as fabric dyeing process. i means to say that, pretreatment step is same in both process (yarn/fabric). but dyeing process is different.
Helo, reders welcome to “chemwhite.com” today i m going to explain about yarn dyeing process and yarn dyeing process flow chart.
What is yarn dyeing?
Yarn dyeing is also a part of textile dyeing.yarn dyeing is carried out before converting yarn into fabric.
Dye solutions is easy to absorbed the fiber in the core of the yarn.
in this process, first yarn is dyed then it make fabric with the help of weaving process.
Yarn dyed materials is used for making fabric with different designs, such as checks design, striped types design.
this types of design is windly use for shirt production.
Read More – Different types of dyes – Uses of dyes, eco friendly dyes & FAQ?
Yarn Dyeing Process;
Yarn dyeing process or fabric dyeing process both are same. in both case pretreatment is required.
Yarn dyeing process is same as a fabric dyeing process. In case of fabric or yarn dyeing, in both case pretreatment is required before dyeing.
In same way, pretreatment is required before yarn dyeing or fabric dyeing.
Therefore, Pretreatment is required in both cases Yarn or fabric. In case of process of yarn dyeing, first off all scouring is done.
Then bleaching is done for improving whiteness or softness. then yarn will be dyed. after this, yarn is ready for dyeing. so, yarn is shifted in dyeing department.
but pretreatment of yarn or fabric is same but yern dyeing or fabric dyeing is different. yarn dyeing is carried out with package form. but fabric dyeing is not done with package form.
In many textile industry, yarn dyeing is done with package form. this method is properly follow in many textile process house, especially for yarn dyeing.
this is one of the most important methods for textile yarn dyeing. after yarn dyeing processing, dyed yarn are always used for woven fabric, making sweaters and more.
After, yarn dyed materials is going to finishing department then finishing is done.
This method is easy to understand with following chart.
Yarn dyeing process flow chart
You can understand with the help of following steps. such as,
Some important steps are required before yarn dyeing:
Scouring is a very important steps before bleaching and dyeing.
the main function of yarn scouring process this is removing the natural fats, waxes, soil or other natural impurities from the surface of yarn.
this is the very necessary steps for yarn dyeing.
In this methods, caustic is used as a chemical for Scouring of yarn.
Temperature should be 100°C degree and time should be 40 mint.
This is the simple or unique methods for scouring.
After scouring, neutralisation with acid at 50°C for 20 mint.
this method is properly given high wet ability for bleaching process and dyeing process also.
In yarn dyeing process , scouring is very helpful for bleaching or dyeing. .
Scouring is very useful steps for bleaching and dyeing.
You know that, this process is done before bleaching.
After complete scouring, sample is dry and again sample is ready for bleaching so, sample going in bleaching department for purpose of bleaching. bleaching is also very important steps for process of yarn dyeing.
this process is given more brightness for yarn.
This process is very helpful for yarn dyeing.
This is the second steps of process of yarn dyeing.
All steps is very important role for yarn dyeing.
In this methods, after scouring nuterlization is done with the help of acid.
then make a proper solutions for bleaching.
In this methods, Peroxide (bleaching agent) is used for bleaching.
It is also work as a bleaching agent.
Temp will be 60°C and time will be 30 mint for bleaching.
After bleaching, unwanted chemicals will be drain.
then sample is ready for dyeing.
This is the third steps of yarn dyeing.
In this steps dyeing is done according to selected sample.
Sample is selected after bleaching for dyeing. dyeing is done according to selected or approved sample.
then prepared to the recipe for dyeing of approved sample.
Dyeing is done according to recipe.
This way yarn dyeing is done for approved sample.
In this method, different parameters is required such as, PH , temp , time or more or different parameters is properly maintained during dyeing.
After dyeing, if dyed yarn is totally match with selected sample or approved sample then it take out from the dye bath. and then drain.
Yarn dyeing techniques/ Methods
First of all, add salt in dyeing bath and maintain temp 60°C for 20 mint, PH – 6.
then add colour at 60°C for 20 mint.
then add soda ash in dye bath at 60°C for 30 mint.
then dyeing is done at 60°C for 60 mint.
Depend upon requirement ( dark shade, medium or light shade)
Dark shade , medium shade , light shade is totally depand upon time duration.
If dyeing is done at 60°C for 60 mint then its given dark shade because dye is Pantrate more on to the yarn during dyeing.
This is the reason its gives dark shade.
If dyeing is done at 60°C for 40 mint then its gives medium shade.
all parameters is necessary to maintain during dyeing.
This way dyeing is completed for approved sample.
4. Hydro-extractor system
This is the fourth steps process.
Hydro-extractor system is also important for complete removel of water from surface of dyed yarn.
In this methods water is easily removed from the surface of yarn.
this method will help in complete removal of of water with the surface of dyed yarn.
then dyed sample is ready for dry.
Dryer machine is used for complete dry of dyed yarn.
Drier machine is applied for remove remaining water from the dyed yarn.
This way dyed yarn will completely dry.
After dry of the dyed sample, finishing materials is apply on to the dyed yarns.
after the finished dyed yarn, dyed yarn is passed for checking department.
In this department dyed yarn are checked by quality officer.
After the passing from quality.
it is ready for delivery.
This is the complete process of yarn dyeing.
And yarn dyeing process flow chart.
Frequently asked questions
1. What is top dyeing?
The top dyeing process is also part of textile dyeing. but top dyeing is done before making yarn or fibers spun. in this process, it is not allowed lose fibers, or short fibers for dyeing.
In other words, first remove the all lose fibers or short fibers from wool materials then it is allowed for dyeing. it is allowed only long fibers of wool for dyeing.
2. What are the textile dyeing techniques?
1. Top dyeing
2. Yarn dyeing
3. Warp beam dyeing
4. Yarn package dyeing
5. Fabric dyeing
6. Garment dyeing
7. Stock dyeing
8. Direct garment or fabric dyeing
9. Stock dyeing
10. Skein dyeing
11. Fibre dyeing.
3. Why scouring is very important steps for yarn dyeing?
Ans – because yarn having natural fats, waxes, and other impurities. This is not proper for bleaching and dyeing. if scouring is not done before bleaching, increase chances of uneven dyeing. thats why, this process is very necessary for yarn dyeing.
4. What is the function of scouring for textile yarn?
the main function of scouring for textile yarn is, to remove soil, fats, wax, vagitable impurities, oils, and natural impurities. and making it a perfectly clean. this process is very helpful for bleaching and dyeing. it gives more chances of even bleaching and dyeing.