Views: 1 Author: Site Editor Publish Time: 2024-01-31 Origin: Site
In jet flow machine dyeing, the fabric operation mode is that the dyed fabric enters the nozzle through the guide roller, and the hydraulic pressure generated by the circulation pump is used to send the fabric into the cloth conveying duct, and then is sent into the cylinder from the tail of the machine, and slowly flows toward the fabric with the dye liquor. It moves forward, reaches the machine head, and then enters the nozzle through the guide roller, thus forming an annular circulation.
After the fabric enters the cylinder from the tail, it has five characteristics during the process of being immersed in the dye solution:
(1) The fabric is basically in a rope bundle state;
(2) About 2/3 to 3/4 of the fabric is immersed in the liquid, and 1/3 to 1/4 of the fabric is floating on the liquid surface (especially light fabrics with small weight or fabrics with poor hydrophilicity);
(3) The stacking state of the fabrics in the cylinder remains basically unchanged and is relatively static;
(4) The fabrics are squeezed against each other and stacked closely (especially when the fabrics are equipped with a large amount of cylinders);
(5) The fabric remains statically stacked in the cylinder for a long time (domestic locomotives are slower, and when each tube is equipped with a cylinder of 700-800m, it usually takes 3-4 minutes to cycle once, especially when dyeing some delicate fabrics. When using fabrics, such as nylon on the front, nylon/cotton twill, nylon/cotton Zhigon, etc.). Sometimes in order to avoid scratches, the vehicle speed is often deliberately slowed down, so the stacking time will be longer.
Production practice shows that the above characteristics are one of the reasons why jet overflow dyeing easily produces uneven color. The reason is obvious, because when the fabrics are immersed in the dye solution in the cylinder, the fabrics are in the shape of ropes, squeezing each other, in close contact, and stacked relatively still for a long time. In addition, some of the fabrics are exposed above the liquid level. The following problems are bound to arise: on the surface of the outer layer of fabric, the flow and renewal speed of the dye liquor is fast, while on the surface of the inner layer of fabric, the flow and renewal speed of the dye liquor is much slower.
Since there is an objective difference in the exchange and update speed of the dye liquor on the inner and outer layers of the fabric, the concentration of the dye liquor inside the fabric is always lower than that of the main circulating dye liquor. Therefore, when the dye used has a fast dyeing rate or the feeding operation is improper, it is easy to cause The dye is unevenly distributed and the color blooms.
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