1： Skein dyeing
The skein dyeing refers to the process of transforming staple fiber yarn or filament yarn into skein yarn with frames connected together on a spinning frame, and then dyeing it by dip dyeing in various types of dyeing machines. As there have been many monographs on skein dyeing before, this book will not repeat them.
2： Cheese dyeing
The staple fiber yarn or filament is wound on the bobbin full of holes (the winding density is required to be appropriate and uniform, generally referred to as "loose bobbin"), and then it is sleeved on the dyeing column (also referred to as yarn bamboo, spindle bar, insertion bar, etc.
3： Axial impregnation
According to the requirements of the color phase and quantity of colored fabric warp yarns, the original yarn is wound on a perforated coil on a loose warping machine to form a loose warp (which can be regarded as a large package), and then it is installed on the yarn carrier of the dyeing machine and put into the warp dyeing machine. With the help of a pump, the dye solution can penetrate and circulate between the warp yarns or fibers to achieve dip dyeing, so as to obtain uniform color warp yarns. This method is called warp dyeing.
4： Warp pad dyeing
Warp roller pad dyeing is mainly used in the production and processing of colored warp and white weft denim. It is to introduce a certain number of dilute shafts into each dyeing tank, and realize the dyeing of indigo (or vulcanized, reduced, direct, paint) dyes after repeated multiple soaking, rolling and aeration oxidation. After pre drying and sizing, we can get uniform color warp yarn, which can be directly used for weaving. The dyeing troughs of the warp beam pad dyeing can be multiple (sheet machine) or one (ring machine). This equipment used together with sizing is called sheet dyeing sizing machine.
5： Yarn bundle pad dyeing
(Ball warp dyeing) This is also a special dyeing method for denim warp yarn. The dyeing process is to first bundle 400-500 original yarns into balls, and then repeatedly soak, roll and air oxidize several bundles (such as 12 bundles, 18 bundles, 24 bundles and 36 bundles) of yarns in multiple dyeing troughs to achieve indigo dye dyeing, and then divide warp and sizing. Acrylic tow can also be pad dyed.
6： Special Dyeing Method of Yarn
Like fabric, yarn also has partial dyeing, such as knot printing, section dyeing, tie dyeing, printing, discharge dyeing, gradient dyeing, etc. 1. According to the design requirements, print one bar (such as 0.5~1cm) of color on the spread yarn every set distance, which can be the same color, but most of them are five colors. It must be noted that the spacing must be irregular and unequal, or "turtle back" or "landscape painting" will appear on the cloth. 2. In stage dyeing, several dyes are simultaneously dripped on different parts of the spread skein, and then fixed and cleaned after vacuum suction or rolling. Compared with the printing section, the color segment is longer, the white yarn spacing is smaller, and even the adjacent two colors will appear "color blocking" on the yarn. Segmental dyed yarn is widely used in knitted fabrics. 3. Tie dyeing: Tie the part of the twisted yarn with ropes (or wrapped with plastic film), and then dye it. As a result, the tightened part is left blank, and some parts of the binding part bleed from deep to light, while the unbound part is evenly colored, so the product has a special flavor. 4. Printing (warp printing) This method is generally used to produce warp printed woven fabrics. The pattern is printed on the warp (not on the weft), and the product style is hazy, like flowers but not flowers. In the process of warp printing, false weaving can be carried out first (the knitting method is printing before warping, and the weaving method is warping false weaving printing), or printing can be carried out directly on the warp, for example, synthetic fiber warp can be printed on the transfer printing machine. 5. Gradual dyeing (colorful silk): Dip different parts of the twisted yarn (silk) in the dye solution for different times to make each frame of yarn show gradual colors from light to deep without obvious boundaries, such as Chinese traditional embroidery colorful silk thread. In addition, there are half dyeing, spray point dyeing, single yarn continuous dip dyeing, etc.
