introduction
Production often encountered in polyester or polyester fabric dyeing the cylinder after the cloth, shade normal and then by the next process finishing after the emergence of color does not match or produce color or local patchy, strip color flowers and decreased fastness and so on , Such problems can be repaired by the re-repair can be repaired, although the re-repair is also difficult to reach the requirements of the normal production to the factory, delivery, quality and efficiency have brought some impact and loss. The following reasons for its production and preventive measures for a brief exposition, for reference.

Cause Analysis of Color Fastness Difference of Polyester Fabric after Forming

Polyester color fastness requirements of high customers, dyeing factory in the actual production process, after high temperature and high pressure dyeing, through the reduction cleaning, and then after high temperature stereotypes, or fail to achieve the desired color fastness.

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The reason is:

Thermal transfer of polyester after dyeing by disperse dyes is the key to the above problems, thermal transfer is a kind of disperse dyestuff common performance.

Refers to the role of dry heat or hot and humid air in the post-finishing high-temperature stereotypes part of the dye through the fiber capillary from the fiber to the fiber surface migration, resulting in the dye on the fiber surface accumulation and redistribution of additives and their presence, including surfactants Remnants of the fabric will exacerbate its production.

Because of this heat transfer is mainly related to the structure of the dye itself, and different structures of the heat transfer of the size of the dye is not a difference between each other is also large, so in the post-finishing high-temperature stereotypes, especially in the use of silicone oil, Antistatic because it contains a certain amount of surfactant, and when these additives in the cloth on the uneven absorption of PH uneven surface, including the cloth, it will produce the so-called color flowers, color, fastness decreased as friction , Washing, stain and a series of problems, this phenomenon is often manifested as one or several co-exist, so as to bring difficult to overcome the dyeing quality of the hidden dangers and hazards.

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How to deal with?

1. First of all to choose a small heat transfer and similar disperse dyes, because the molecular structure of these dyes larger, with the affinity of polyester fibers are also larger, it is difficult to migrate from the fiber to the surface.
Such as xx company's LXF type, xx's XF type, xx's big love Nick Division XF / SF type and xx of the MS series and so have good heat transfer fastness.

2. The choice of fight color dyes try to use the same type or high temperature dyes, different types of dyes due to the different proportion of heat transfer, sublimation fastness is not a high-temperature sublimation fastness, although the dye heat transfer prison The degree of sublimation and the degree of sublimation is not consistent, but the high-temperature dyes at higher temperature dyes sublimation less stereotypes, the corresponding shade of light stability is also good.

3. After finishing the use of more moderate process, the deeper the color of the migration of the more dyes, the higher the temperature, the greater the impact on migration, in the case of stereotypes to ensure the case depending on the species can choose 150 �� or lower , Thereby avoiding or reducing the migration of the dye.

4. After finishing the softener to be selected, as far as possible without emulsifier hydrophilic silicone oil or self-emulsifying block silicone oil, and the stability of such silicone oil, color change, yellowing low, the dye migration can play a more Good preventive effect.

5. To strengthen the reduction of cleaning after dyeing, especially dark, the floating color must be cleaned to ensure their own fastness, and try to use acid cleaning, if the use of alkaline insurance powder technology, it must be in, and part Dye PH sensitive, and some in the PH> 6 after finishing by high temperature will become blue or purple, and some of this color is irreversible, or even not repair.

National Star summary

As long as the production process through the above-mentioned measures and with a reasonable pre-treatment, dyeing process, I believe after finishing the color, color change and fastness decline and a series of quality problems will certainly be able to control our request within the scope.

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