What are the rung problems that occur after dyeing?

According to the causes caused by spinning, weaving and printing and dyeing processing, there are the following categories:

1. Rungs can be divided into three categories

(1) Line reason type rungs;

(2) Weaving (knitting and weaving) reasons for horizontal rails;

(3) Printing and dyeing reasons rungs.

2. According to the characteristics of the rungs, they can be divided into:

(1) A sexual rung;

(2) Multiple sexual rungs;

(3) Regular rungs;

(4) Color difference rungs, etc. (gray fabric color difference rungs and dyeing color difference rungs).

3. Difficulty of rung analysis:

1. Many of the yarn causes that cause rungs cannot be found during spinning or after the yarn is made. It is also difficult to find on knitting and looms, and some can even be found after going to the dyeing factory;

2. There are many forms and changes of rungs;

3. The causes of rungs span a wide range;

4. At present, there are no advanced detection instruments to analyze and determine the reasons for the horizontal rails;

5. There is no professional testing agency to make authoritative and professional analysis of the rungs;

6. About 70% of it is caused by poor control of differences in intrinsic quality indicators of fibers in spinning ingredients.

4. The causes of yarns causing weaving, printing and dyeing rungs are summarized in the following ten aspects:

(1) Spinning raw materials: pure cotton raw materials, chemical fiber raw materials, colored spinning raw materials;

(2) Cotton batching: 1. Improper control of performance differences of raw materials in batches; 2. Improper control of batch ratios;

(3) Mixing uniformity of raw materials: 1. Poor mixing uniformity of raw materials; 2. Yarn and fabric cannot be seen at all, and horizontal bars appear after dyeing;

(4) Production management and warehouse management;

(5) The 100-meter weight deviation and weight CV are too large;

(6) The yarn dryness CV is too large;

　(7) Twist and twist CV;

(8) There is a lot of hairiness and a large hairiness CV value;

(9) Long thick and long detailed yarn defects;

(10) Mechanical reasons: The weight deviation and weight CV are too large to 100 meters, the evenness CV is too large, the twist and twist CV, excessive hairiness, thick and long detailed yarn defects, and the cloth surface color difference caused by the mixing ratio are relatively large. It is easy to analyze, but the analysis is difficult only because of the cotton distribution, because the area caused by the cotton distribution is large and the regularity is not strong.

5. There are two types of rungs caused by cotton distribution:

1. Improper performance control of the batch of raw materials;

2. Improper control of the proportion of raw materials for batches.

No matter which type, the yarns are mixed when receiving the batch. The first type is regular, resulting in rungs, which requires fiber reduction method for inspection. The second type is the regularity is not obvious.

6. How to read the rungs:

Methods adopted: tiling method, light transmission method, facing light method, backlighting method, and tilting method.