Package Dyeing Guide To Communicating Value

 

Package dyeing is a most commonly form of yarn dyeing. This is a method of wrapping the yarn around a perforated dye vessel. So it is suitable for dyeing cotton yarn as well as polyester yarn, wool yarn, etc.

​Raw Material

At present, the varieties of package yarn dyeing are as follows:
Pure polyester filament and staple fibers such as 42S/3, 50S/3, 60S/3 and 80/3 are dyed with disperse dyes, which have high production efficiency and good quality.
Polyester cotton stick yarns, such as 45S, 28S single yarns, 42S/2 strands, are also very effective in package dyeing. Most of them are dispersed and reduced two-bath dyeing, which is used in yarn-dyed industry.
Polyester viscose blended yarns, mostly medium long fiber, 32S, 32S/2 specifications. However, due to the large swelling of the adhesive fiber part, if it can be shaped, the effect of package dyeing is better.
Cotton package dyeing requires higher requirements for soft and winding than polyester/cotton blended yarn, because pure cotton needs to be boiled, which will shrink and deform the package yarn, so only a few varieties of pure cotton adopt package dyeing.

Package dyeing process

Process

​Package yarn → filling yarn → cylinder feeding → pre-treatment → dyeing → post-treatment → cylinder unloading → drying → unloading yarn→ knitting

Discussion of technical conditions

  • Before dyeing, different pretreatment processes are selected according to the raw materials of the treated simple yarn, which not only helps to maintain the unique properties of pure cotton, polyester and polyester cotton yarns, but also improves the dyeing quality, shortens the process flow, reduces the raw materials and energy consumption, and improves labor productivity.
  • Dyes and auxiliaries must be dissolved and filtered into the machine and dyed according to the requirements of the process curve.
  • With additional air pressure, we stipulate that it is greater than 5×104Pa, which is conducive to uniform penetration and circulation of the dye solution. At the same time, a cycle from inside to outside and from outside to inside can be completed under the condition of feasible operation, so as to ensure the consistency of dyeing of each layer of cheese yarn.
  • Post-treatment: due to the particularity of the finishing of bobbin, we reformed the post-treatment process, that is, when the simple yarn is washed after dyeing and washing, we applied pressure to prolong the soft treatment time and improved the technological formula. After treatment, the package yarn felt hard and the hair defects on the surface were significantly improved, which met our quality requirements.
  • Drying, drying process also directly affect the quality of yarn quality. The drying time is too long, the temperature is too high and the color yarn is dry and hard, the time is too short, the inner and outer layers should be dry and wet, affecting the quality of the color yarn.

This article is reprinted from https://fyitester.com/. You can come here for structure, advantages and dis advantages of package dyeing.

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