How Is The Reactive Printing Process?

In the textile industry, the printing process is also a very important skill. Reactive printing can generally be divided into two types of printing: conventional all-material printing (one-phase method) and two-phase printing.

Conventional all-material printing refers to the process of putting all dyes, alkalis and auxiliaries into the printing paste together, while two-phase printing involves putting only dyes and auxiliaries into the printing paste (as one phase) and putting alkalis into the color fixation process (as the other phase), so that the reactive dyes are fixed onto the fiber through the contact of the two phases.

Conventional direct printing is widely used, not only for all reactive dyes, can also be applied to the common printing with other dyes, such as La live process (La Pieda dyes and reactive dyes together printing), ice live process (ice dyes and reactive dyes together printing). 

So today I will briefly introduce you two different printing processes:One-phase Print-Dry-Steam and One-phase Print-Dry-Thermofix.

One-phase Print-Dry-Steam process

white cloth 一 printing 一 drying 一 steaming 一 washing off 一 drying

Printing Recipe ( %)

1）Steaming requirements

Cotton cloth ( 102-105°C ) 5-10'

Viscose cloth ( 102-105C ) 7'

2）Washing process

Cold rinsing 一Hot washing70-90°C 一 Soaping95-100° 一Hot washing 一 Cold washing

Vaporization is the process of color fixation. The reaction speed of reactive dyes and fibers accelerates with the increase of temperature, high temperature treatment at a certain humidity is conducive to the full diffusion and penetration of dyes, so that the dyes and fibers fully combined.

The time of vaporization depends on the reactivity of the dyes, for slow reacting dyes, the vaporization time can be extended to 8 to 10min.

One-phase Print-Dry-Thermofix process

white cloth 一  printing一 drying一  baking一 washing off 一 drying

When KN type reactive dyestuff is in steam process, the formation of fibers and dyestuff covalent bonding is easy to hydrolyze, steam method of color fixation rate is lower than the baking method. So we can use Print-Dry-Thermofix instead of Print-Dry-Steam to fix the color of reactive dyestuff printing, and this method is suitable for KN type dyestuff. But in the baking process, generally do not add urea, or the dyestuff will occur with its addition reaction at 140 ℃ or more, reducing the rate of color fixation.

Keywords:Reactive Printing,one-phase method,Print-Dry-Steam, Print-Dry-Thermofix, reactive dyestuff, alkalism, auxiliaries

Recommend product: disperse printing thickener, reactive printing thickener, pigment printing thickener

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