What is the new technology of cheese dyeing?
Guide: In this course, we will introduce the application of new technology for cheese dyeing, including the winding technology and dyeing technology.
In 1882, the Germans invented the first cheese dyeing machine;
After 1960, my country's former Ministry of Textile Industry introduced foreign cheese dyeing machines, but failed to apply successfully. The cheese dyeing machines were transformed into hank dyeing machines by the Chinese;
Around 1970, cheese polyester dyeing began to be applied gradually, but it was rarely used for dyeing cotton yarn;
After 1990, cheese dyeing was applied to various fibers, and cheese dyeing began to develop rapidly in China.
Today, when reactive dyes are widely used, in the field of cellulose fiber dyeing, Vat (Shihlin) dyes still have an indispensable place. Reactive dyes have poor fastness to chlorine and sunlight, and cannot meet the requirements of high sunlight and chlorine bleaching resistance fabrics. Vat dyes can just solve these two fastness problems.
Shihlin dyes are called never fade dyes. Before the invention and application of reactive dyes, indanthrene was the most commonly used dye in dyeing factories.
The oxygen bleaching resistance of vat dyes can be applied to colored fabrics, and special low-cost colored fabrics made of Shilin colored yarns and raw yarns can be developed.
(1) The traditional vat dyeing generally uses the dry vat method, while the cheese dyeing uses the suspension method more;
(2) Dispersants and leveling agents with excellent performance are indispensable for cheese dyeing;
(3) In terms of equipment selection, the full-filled cheese dyeing machine is more suitable for vat dyeing than the air cushion dyeing machine;
(4)The loose tube size and density of the cheese, the internal and external circulation settings of the dyeing machine, and the washing process settings. Vat dye dyeing has more stringent requirements than reactive dye dyeing;
(5) Different from traditional vat dyeing process curve setting;
(6) Dye fineness requirements, ultra-fine powder and liquid dyes are more suitable for cheese dyeing.
(1)The chromatogram is not complete with reactive dyes;
(2)The dark wet rubbing fastness is relatively poor;
(3)Higher requirements for workers' operation.
Another shortcoming of reactive dyes used in cellulose fiber dyeing is the lack of fluorescent colors. The only fluorescent dye in reactive dyes is Remazol FL fluorescent yellow launched by DyStar in 2002. Other chromatographic reactive fluorescent dyes have not been available until now.
The fluorescent color spectrum of the coating is relatively complete, which can meet the requirements of different fluorescent colors. Therefore, the cheese dyeing of fluorescent paint is gradually being applied and popularized.
(1). The general dyeing process is: pretreatment - modifier modification - adhesive + paint dyeing - soften
(2). The performance of the modifier determines the excellent leveling property;
(3). The higher the amount of binder used, the higher the color fastness of the coating, and the choice of binder also affects the final feel of the yarn;
(4). The fineness of the paint is also one of the factors that affect the excellent dyeing;
(5). The density and size of the package yarn also need to be set according to the thickness of the yarn count;
(6). Reasonable drying temperature and method are helpful for the fixation of paint and adhesive.
(1). Rubbing fastness is worse than reactive dyeing;
(2). It is not easy to repair it if there is color irregularity;
(3). The paint dyeing equipment needs to be cleaned regularly.
Optimizing the dyeing bobbin to ensure that the dye liquor flows evenly in the entire dyeing bobbin is the only way to ensure the supply of dyes and auxiliaries. It is also necessary to ensure that the cheese structure cannot be modified.
The modification will not only cause problems for subsequent processing, but will also cause uneven dye flow during dyeing. Channel flow will be formed between the bobbin and the bobbin, and the dye will flow.
When the resistance is small, the dye liquor will flow to the soft bobbins more, and the hard bobbins will be less, resulting in uneven dyeing inside the bobbins.
Common winding bobbins include conical, cylindrical and compressible cylindrical tubes
The flow rate of the upper and lower edges of the conical tube is different, and the dye solution at the edge of the tube is very easy to leak, which affects the control of the layer difference and the cylinder difference.
The flow of dye solution is symmetrical to the center line of the bobbin, but the leakage of the two bobbin yarn spacers is the same as that of the cone. The advantage is that under the same conditions, a higher yarn capacity can be obtained, which is about 30% higher than that of a tapered tube.
The compressible tube can obtain the ideal liquid flow and ensure the layer difference. At the same time, compression increases the yarn capacity by 15% and reduces costs. However, the equipment performance requirements are high.