Abstract: For the dyeing and finishing production prone to flaws were summarized in terms of color and classification system, and one by one to carry out the analysis of various reasons with other impacts, and discusses the corresponding preventive issues, "a success" 'foundation of technology and management, as well as " The positive significance of the idea of ​​"prevention from oversight".
Dyeing and finishing of textiles, dyeing and finishing more Ins and Outs of the overall result of factors, so in actual production in large, often encounter this kind of quality problems, which are particularly frequent and color-related, and may Column One is the color difference problem.
1 Classification of color difference
The color difference is the following:
a. Sampling color difference (large and small sample differences);
b. Batch color difference, is divided into batch color difference, the same batch of cylinder difference, the same cylinder of the difference;
C. Other chromatic aberrations include front and back chromatic aberration, left and right chromatic aberration, and discoloration chromatic aberration (after-treatment, after-finishing color change).
1.1 Color difference
At present, the dyeing and finishing process basically needs to be carried out according to the color specified by the customer, and the requirements for the level of the shade color are very high, and some customers are nearly harsh. Stake color difference, that is, the difference in color between a sample and a large sample, is also a problem that must be addressed and must be addressed in the first step of production. It can be seen that the more consistent the method of dyeing the sample with respect to the large machine, the smaller the loft color difference will be. However, the reality is that there isn't much that the two can be highly consistent. Usually they can only reach a certain degree of similarity, and there are even large gaps between the similarities of some dyeing types (such as junk dyeing). Therefore, the success of the small-scale test cannot be equated with the fact that large-scale production will succeed. Especially when new products, new materials, new technology development or trial, a small laboratory test method procedures, and may not be able to copy a large workshop test can sometimes possible distance between the two is still very great. For this purpose, in addition to matching and appropriate small prototype advanced facilities and other ancillary equipment, when the conditions, for a first intermediate web (or bobbin th I-2) The sample test, and then the next big test, will no doubt be more useful and safe. Due to the effect of the pilot test on the large aircraft, it is much closer than the small test.
It is always the goal pursued by the technology to set a standard once, and it is of fundamental significance to set a standard to prevent the cylinder difference. This problem can not be separated both advanced laboratory test equipment and facilities, and also involves the level of technology and technology management, no doubt, is one of the key technology printing and dyeing enterprises, and today is widely respected "staining "One success " requires that it is a prerequisite . The traditional "after adjustment", the transition to "pre-master and control", is setting out to solve a quasi-premise. At the same time , mastering the before and after evolution of the color in the entire production process and its laws, a large number of detailed and basic work is essential.
1.2 Batch color difference
1.2.1 Color difference between batches
Batch color difference includes the color difference between different production batches , and the color difference with batch nature in the same batch . The bulk of the color difference has been a chronic problem on the production Jie color, surface involved is relatively broad, and its prevention overcome, should be a systematic project.
Factors leading to the batch of color, are summarized in the following four aspects:
a. Different sources of fiber raw materials, as well as different batches, batch numbers, there are differences in the absorption rate of dyes;
b . Dyestuffs , additives , chemical raw materials from different places of production , as well as different batches , batch numbers , the content of their active ingredients are different;
c . The planning and scheduling with rows of cylinders and cylinder rationality (different types of dyeing machines there are differences in the color shade, with cylinders, improper scheduling of batch difference, the difference also has an associated cylinder);
d . Normative on the implementation of process conditions (determined by the level of quality and management staff), this is not just in the dyeing phase, pre-treatment, finishing and other production processes also included.
If there is a problem in the above 4 points, it will affect the production of batch color differences. If the technology and management of enterprises have less short, it is likely to be complicated by multiple factors appear to make finding the real reason, adding to the complexity and difficulty.
1.2.2 The same batch of cylinder difference
Cylinder difference is another difficult problem in batch dyeing . First, before preparing for the rational part of the hair with a white base cylinder is a prerequisite, and the largest source of influence, it is the quality of the workshop group first line operators, namely whether the operation execution process did provisions, and its operation The unity of individuals, machines, and flights is highly unified.
Dyes, said metering requires accurate, it is clear and simple truth. However, dyes warehouse in practice, but they can easily go wrong, it needs together with the review, review and other procedures and systems to fully guarantee. And even equipped with modern automatic Weighing dosing system, we can not absolutely guarantee foolproof, system failure or human error of control after a long work, nor also completely impossible, if the neglect of maintenance and inspection and maintenance Management , especially in the continuous production line , once the volume of events will be very large .
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