Cause Analysis Thermal migration of polyester dyed with disperse dyes is the key to the above problems. Thermal migration is a common property of disperse dyes. It refers to the effect of dry heat or hot and humid air during the finishing of high temperature setting. The migration of the dyes on the fiber surface is caused by the migration of the fiber capillaries from the inside of the fiber to the fiber surface. The presence of additives and their surfactants, including residuals on the surface of the fabric, aggravate their production, due to this thermal migration mainly with dyes. The structure itself is related, and the disperse dyes with different structures have different sizes of thermal mobility, and they are also different from each other. Therefore, in the post-finishing high-temperature setting, especially when using silicone oil and antistatic, it contains a certain amount of The surface active agent, and when the uneven absorption of these additives on the cloth surface includes the unevenness of the pH of the cloth surface, the above-mentioned so-called color flower, discoloration, and drop in fastness such as friction, washing, staining and the like are produced. The problem is that this phenomenon often manifests as one or more types of co-existence, which brings insurmountable hidden dangers and harms to the dyeing quality. 1. The first choice is to select disperse dyes with small thermal mobility and similarity. Because these dyes have a larger molecular structure and a higher affinity with polyester fibers, it is difficult to migrate from the inside of the fiber to the surface. For example, Longsheng's LXF type, BASF's XF type, DyStar's Grand XK/XF/SF type, and Anerox's MS series all have good thermal migration fastness. 2. Selection of fight-colour dyes Use the same model or high-temperature dye as far as possible, because different types of dyes have different heat migration ratios, sublimation fastness is not one, high-temperature sublimation fastness is high, although the heat transfer of dyes is strong The degree of consistency is not consistent with the sublimation fastness, but the high temperature type dyes have less sublimation of the dye under the higher temperature setting, and the stability of the corresponding color light is also good. 3. The finishing process adopts a gentler process. The darker the color is, the more the dye migrates. The higher the temperature, the greater the impact on the migration. Under the condition of ensuring the setting effect, 150°C or lower can be selected depending on the variety. The temperature thus avoids or reduces dye migration. 4. Select the softener after finishing. Use hydrophilic silicone oil or self-emulsifying block silicone oil that does not contain emulsifier as much as possible. The silicone oil has good stability, discoloration and yellowing, and can play a role in dye migration. Good preventive effect. 5. Strengthen the reduction and cleaning after dyeing, especially the dark color, the floating color must be fully cleaned to ensure its own fastness, and try to use acidic cleaning, if using alkaline powder technology, it must be neutral, because part Dyes are more sensitive to PH, and some will become blue after the high temperature finishing at PH>6, and some of this discoloration is irreversible and even impossible to repair. SHAOXING SKYRISE TEXTILE CO.,LTD , https://www.eurofashiontextile.com
In short, through the above measures and with a reasonable pre-treatment, dyeing process, I believe that a series of quality issues such as color, color change and fastness after finishing finishing will surely be able to control within the scope of our requirements.
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Often encountered in the production of polyester-based or polyester-containing textile dyeing the cloth rear cylinder, and then the normal shade match but there shade or color change occurs locally generated i.e. plaque, and flower color fastness drops stripe phenomenon after the finishing step Those who suffer from such problems can still be repaired through renewed repairs. Even though the severe ones are repaired, it is difficult to meet the requirements. This will bring about certain impacts and losses on the normal production, delivery, quality and efficiency of the factory. The following is a brief explanation of the causes and prevention measures for their reference.