Color Difference of Cone Dyeing Machine

 

cone dyeing machine

A cone dyeing machine is also called a package dyeing machine, a bobbin yarn dyeing machine or a cheese dyeing machine. When we introduced package dyeing before, we mentioned that there was a major flaw when dyeing with a cone dyeing machine. That is, the color difference between the inside and outside of the cheese is relatively large.

In this article, we will analyze the causes and prevention methods of the color difference between the inner and outer layers of the cheese yarn.

Manifestations of color difference

There are two cases of color difference of cone dyeing.
  • The middle yarn and inner yarn have different shades of color.
  • The different shades of color between inner yarn and outer yarn

Discrimination method

Generally speaking, there are two ways to judge the color difference of the cone dyeing:
  1. Visually assess the degree of color difference between the inner and outer layers.
  2. Use a small knitting machine to knit the yarn into tubular fabric. That is, use inner, middle and outer yarns to knit together into a tubular fabric to see if the fabric has dyeing defects such as cross paths.

​Causes and prevention methods of color difference of cone dyeing machine

Water quality

​The water quality requirements for cone dyeing are:
  • Chlorine content<0.05mg/L.
  • Water hardness <25mg/L.
  • The chromaticityof water <3 degrees.
  • Iron content ≤ 0.1mg/L.

Pump

When dyeing with a cone dyeing machine, the dye liquor needs to penetrate into the inner layer of the cheese by the head of the pump, and achieve a balance through the reciprocating circulation inside and outside. Therefore, the pump must have enough head and flow, and the head and flow of the pump can be adjusted by the dye liquor bypass valve.

Dye

When dyeing polyester-cotton blended yarn and cotton yarn, the choice of dyestuff is the most important factor affecting the color difference between the inside and outside of the cheese. Due to the particularity of cone dyeing, the dyes used are required to have good permeability, excellent migration and dyeing fastness.

The design of dyeing process

The dyeing process of polyester-cotton blended yarn (two-bath method) is:
Grey yarn → pre-shrinking (steaming) → winding → pre-treatment → dyeing and polyester → cleaning (reduction cleaning) → cotton dyeing → post-treatment → drying → yarn rewinding → weaving
Dyeing process of cotton yarn:
Grey yarn → winding → pre-treatment → cotton dyeing → post-treatment → drying → weaving
To learn more, please click here. This content is provided by fyitester.com.


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