Color difference or horizontal stripes of DTY

（1） Solution

To solve the problems of color absorption, curl shrinkage, and linear density that affect dyeing, it is necessary to start from POY raw materials and carry out full process management. During the production process, it is necessary to ensure the uniformity of linear density, promptly handle leaking components, metering pumps, and strictly separate floating wires. Strengthen management, avoid the production of mixed batches and misaligned threads, and ensure stable melt quality, component cycle, and side blowing cooling conditions; ② The pressure, pressure difference, temperature, and speed in the production process parameters must be kept stable, and strict fluctuation diversion standards must be established Strengthen ingot position management and reduce ingot position differences; ④ Replace expired DTY equipment components such as false twisters, leather rings, rollers, etc. in batches, and maintain consistent processing conditions for all ingot positions; ⑤ During the DTY processing, the threads must be consistent; ⑥ Adopting stricter color judgment standards has been proven in practice that using the gray card standard used in national standards for color judgment is becoming increasingly difficult to meet the increasingly strict dyeing needs of users, often resulting in small color differences. Currently, many manufacturers have adopted a 4.5 level standard and use woven standard samples as a reference to subdivide product colors into deep, medium, and light colors, further improving the dyeing uniformity of products In addition, it can be processed according to the characteristics of the customer's fabric, such as weft knitted fabric, to improve the curl shrinkage rate of DTY. This way, DTY has good elasticity and fullness, and after dyeing and finishing, the fabric can cover up some slight stripes.

Among the above conditions, the consistency of DTY processing conditions is particularly prone to problems. Due to the characteristics of multiple components, multiple ingot positions, and labor-intensive processing, DTY processing has a high proportion of misoperation. According to experimental comparisons, the threading process between the first and second level rollers is the most important. The OY filament completes the stretching and false twisting process between these two components. This segment of threading is the core of threading and must be accurate. Otherwise, any inconsistency in heating, stretching, twisting, or cooling conditions will result in shrinkage differences and fluffiness, which can easily form significant color differences and significant losses. Therefore, it is required that the operator must conduct an inspection and confirmation of this section of the thread after giving birth