What types of dyeing processes are there?

Polyester-cotton knitted fabrics not only have the advantages of cotton fibers being skin-friendly, soft and comfortable to wear, but also have the advantages of polyester fibers being firm, maintaining shape, and being easy to wash. Favored by consumers. The traditional dyeing of polyester-cotton knitted fabrics mostly adopts the two-bath and two-step method. At present, there are the following processes:

The first process is to remove all kinds of impurities and polyester spinning oil on the cotton fiber by prior treatment (bleaching and degreasing), then dye polyester with disperse dyes, reduce washing, and then dye cotton with reactive dyes and soap. The production quality is relatively stable, but there are problems such as long production process, large water consumption and high energy consumption.

In the second process, first disperse dyes are dyed and washed, then scouring (bleaching cotton to remove oil), and then reactive dyes dyeing cotton and soaping, which can save the reduction washing process.

In the third process, the pretreatment and dyeing are carried out in the same bath, and then cotton and soaping are applied, which reduces the pretreatment process.

The fourth process uses high-fastness disperse dyes and reactive dyes for one-bath two-step dyeing, eliminating the need for reduction cleaning after polyester dyeing.

The fifth process uses electrolyte-resistant disperse dyes or disperse dye microcapsules and neutral reactive dyes for one-bath and one-step dyeing, which shortens the process time, increases output, saves water and electricity, reduces steam consumption, and reduces overall dyeing costs.

In today's increasingly stringent environmental protection requirements, the sewage discharge quota is getting tighter and tighter, and the energy saving and emission reduction of various printing and dyeing plants has become the most urgent need to reduce dyeing costs. Cost of production. Zhejiang Jinguang Industrial Co., Ltd. takes "energy saving, emission reduction, and cost reduction" as the starting point, and the alkali-free reactive dye EMF independently developed and mass-produced has been applied in large-scale production and achieved obvious economic and social benefits. This series of dyes has the following characteristics:

(1) The dyeing process does not need to add alkali to fix the color, and only needs to add a small amount of yuanming powder when dyeing under neutral conditions;

(2) No pickling and soaping are required after dyeing;

(3) Shorten the dyeing process time by 2.5 to 3 hours;

(4) Excellent compatibility and levelness, and extremely high lifting power;

(5) The indicators of dyeing products meet the requirements of traditional reactive dyes for saline-alkali dyeing.

Using disperse dyes ACE and reactive dyes EMF, we have developed a one-bath and one-step dyeing process for polyester/cotton blended fabrics with disperse/reactive dyes, which has been applied to the large-scale production of many printing and dyeing enterprises in Zhejiang and Jiangsu, and has achieved obvious economic benefits and social benefit.