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The effect of disperse dyeing?

Views: 2     Author: Site Editor     Publish Time: 2021-07-27      Origin: Site


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The thermal migration of disperse dyes is not the redistribution of dyes in the two phases of fiber and surface solvent under dry heat conditions, but its inherent physical characteristics, which also cause the color fastness and shade variation of polyester-containing fabrics to decrease during dry heat treatment after dyeing. 

Key factors: through analysis of dyeing temperature, heat treatment temperature and time, dye sublimation, surface active agent and finishing agent, dyeing method and the influence of heat setting on dye thermal migration, try to use pre-dyeing high temperature preset type, 130℃ The following non-contact hot-air drying and low-temperature soft drying process, as well as low-temperature slow-speed resin finishing process and other countermeasures, in order to control the thermal migration of dyes to a minimum.

Polyester fabrics (pure polyester fabrics or polyester-cotton, polyester-viscose and other interwoven or blended fabrics) are dyed with disperse dyes (especially dyed with darker colors by high-temperature and high-pressure methods), and then subjected to dry heat treatment above 130℃

For example, after dyeing, heat stenter setting, resin baking, etc., the following three aspects usually have different degrees of changes, such as dyeing fastness (soaping, friction, sun exposure) is significantly reduced, and generally medium and dark colors are reduced by 0.5 ~1.5; the color of the cloth surface changes to different degrees; the pollution of the cotton and viscose components of polyester-cotton, polyester-viscose and other interwoven or blended fabrics will increase significantly.

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