Dr. Petry / News / PERISTAL MC liq.: Acid Reductive Clearing of Polyester in a LEAN Process

PERISTAL MC liq.: Acid Reductive Clearing of Polyester in a LEAN Process

With PERISTAL MC liq. you save time, water, energy and chemicals during reductive clearing after polyester dyeing The treatment of PES goods in a LEAN process with PERISTAL MC liq. is carried out in the acid pH range. In contrast to conventional alkaline reductive post-treatments, the fabric does not have to be neutralized in the end.

Reductive Clearing after Disperse Dyeing

In order to achieve good color fastness on dyed textiles made of polyester, triacetate or their blends, the fabric must be reductively cleared after dyeing. Especially dark shades require thorough cleaning. The post-treatment removes excessive, non-fixed disperse dyestuff.

Conventional reductive clearing (r/c) is carried out after an intermediate rinsing step in the alkaline pH range with hydrosulfite (sodium dithionite, Na₂S₂O₄) and caustic soda (NaOH). After the reductive treatment, the goods must be thoroughly rinsed and neutralized. The salts resulting from the neutralization process further pollute the wastewater.

LEAN Process: Clearing in the Dyeing Liquor with PERISTAL MC liq.

An acid clearing after disperse dyeing with PERISTAL MC liq. can be carried out in the cooling acid dyeing liquor. This means that no intermediate rinsing is necessary. The reducing agent is added at 70 to 80 °C and the dyed textile goods get reductively cleaned. If necessary, before adding PERISTAL MC liq. to the exhausted dyeing liquor the pH is adjusted to 3.5 to 4.5 with acetic acid.

Reductive clearing with PERISTAL MC liq. is a modern LEAN process. Compared to the conventional scouring process with hydrosulfite and caustic soda, the post-treatment with PERISTAL MC liq. offers a significant savings potential in water, energy, time and chemicals. Like our other LEAN processes , the LEAN process with PERISTAL MC liq. offers many advantages over traditional methods.

What does LEAN stand for?

Our streamlined lean processes are characterized by:

Less time
Economical processes
Advanced chemistry
New technologies

Advantages of r/c with PERISTAL MC liq.

We recommend the use of PERISTAL MC liq., our liquid, highly effective reducing agent, for the use in the cooling acid dye bath. r/c with PERISTAL MC liq. after disperse dyeing offers the following advantages:

easy handling, no dealing with powdery hydrosulfite needed
automatic dosing possible since the product can be pumped
no neutralization necessary after r/c
significant savings in time, energy, water and chemicals

We recommend the use of PERISTAL MC liq., - High-Efficient Reduction Agent

We recommend the use of PERISTAL MC liq., is a highly effective reduction agent, which is applied for the clearing of dyeings with disperse dyes in the acidic pH range.

Please Contact Us.

Do you need support in optimizing processes in your dyeing or finishing plant? Please feel free to contact our textile chemistry specialists by e-mail or use our online form to get in touch with us.