According to the causes caused by spinning, weaving and printing and dyeing processes, there are the following categories:
1. Rungs can be divided into three major categories
(1) Thread-related rungs;
(2) Weaving (knitting and weaving) rungs;
(3) Printing and dyeing reasons.
2. According to the characteristics of the rungs, they can be divided into:
(1) One-place rungs ;
( 2) Multiple rungs;
(3) Regular rungs;
(4) Color difference rungs etc. (gray cloth color difference rungs and dyeing color difference rungs).
3. Difficulty of rung analysis:
1. Many of the yarn causes of rungs are in spinning It can’t be found when the yarn is made, and it won’t be discovered until 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. Currently, there are no advanced detection instruments to analyze and determine the causes of rungs;
5. There is no professional testing agency to make authoritative professional analysis of the rungs;
6. About 70% of the reasons are due to the fibers in the spinning ingredients. Differences in intrinsic quality indicators are caused by poor control.
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 matching Batch receiving: 1. Improper control of performance differences of raw materials in receiving batches; 2. Improper control of batch proportions;
(3) Mixing uniformity of raw materials: 1. Mixing uniformity of raw materials Poor control; 2. The yarn and fabric cannot be seen at all, and rungs appear after dyeing;
(4) Production management and warehouse management;
(5) The weight deviation and weight CV of 100 meters are too large;
(6) The yarn evenness CV is too large;
(7) Twist and twist CV;
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(8) More hairiness and larger hairiness CV value;
(9) Long thick and long detailed yarn defects;
(10) Mechanical reasons: The weight deviation and weight CV are too large toward 100 meters, the evenness CV is too large, and the twistAnd twist CV, hairiness, thick and long detailed yarn defects, cloth surface color difference caused by mixing ratio are all easier to analyze. Only the cotton blending is difficult to analyze because the area caused by cotton blending is large and the regularity is not strong.
5. There are two types of rungs caused by cotton distribution:
1. The performance of the batch of raw materials Improper control;
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 and causes horizontal bars, which requires fiber reduction method for inspection. , the second one is that the regularity is not obvious.
6. How to look at the rungs:
Methods adopted: tiling method, transparent method Light method, facing light method, backlight method, tilt method.
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