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Discharge agent for pigment discharges. Reducing agent for direct printing with pigment dyes.


AI DISCHARGE Liquid has excellent stability both in the print pastes themselves and in the dried prints before steaming.

AI DISCHARGE Liquid is stable to alkali but very sensitive to acids. The latter destroy the product.

At temperatures above 120 8C AI DISCHARGE Liquid decomposes with evolution of gases BUT DOES NOT RELEASE FORMALDEHYDE.

The above figures are approximate. Tolerances are given in the product specification.


24 months


AI DISCHARGE Liquid can be kept in the original sealed containers at temperatures between 10 8C and 30 8C for at least 24 months. Once containers have been opened, the contents should be used up quickly. Containers should be closed tightly after use.


1. Pigment discharges

AI DISCHARGE Liquid is an environmentally friendly, zinc-free reducing agent and is ideal as a discharge agent in solvent-free pigment discharge printing on discharge grounds dyed with reactive or direct dyes.

AI DISCHARGE Liquid is used in this case together with synthetic thickeners. It is well-known that in discharge printing the life of the rotary printing cylinder can be considerably shorter than in the corresponding direct printing methods.

This also applies to pigment discharge printing as opposed to direct pigment printing. Even in solvent-free pigment discharge printing, in rare cases there can be increased abrasion of the printing cylinders. This abrasion can result in a reduced service life of the printing cylinders.

Any streaks appearing in the printed articles can be removed by oxidation treatment in washing off the prints. Although these streaks occur only sporadically, thorough preliminary trials should always be carried out.

Guideline recipe stock discharge paste for cotton (high quality requirements, simple recipe formulation)

Viscosity: approx. 50 dPa?s (measured with Viscotester VT 02 made by Haake Mess-Technik GmbH u. Co., Karlsruhe).

The required amount of  AI DISCHARGE Liquid is governed by the substrate and ground shade and must be determined in each case by preliminary trials. The products are stirred into the water with a high-speed stirrer in the sequence given. Homogenized for 8-10 minutes. The pH of the pastes should be 8.

2. colored discharges.

The  pigments are best added to stock paste containing reducing agents just before printing is commenced.

3. White discharges.

After printing, the fabric is dried. The discharge action of  AI DISCHARGE Liquid declines noticeably at temperatures above 120 8C. The temperature on the fabric should therefore not exceed 110 8C.

The fabric is then steamed (6-10 minutes at 102 8C with saturated steam,air-free) and cured (5 minutes at 150 8C with hot air).

Finally the prints are rinsed in cold water, treated at 40-60 8C with 2 ml/peroxide, then soaped at 30-C  rinsed again in cold water and dried. Fabric printed with AI DISCHARGE Liquid and then thoroughly dried should be left no longer than 2 days before being steamed.

The printed and dried fabric must be protected from moisture because this in combination with accumulated heat causes decomposition of the reducing agent, thus adversely affecting the discharge effect.

Steaming with saturated steam in an air-free steamer is necessary for the reductive destruction of the ground dyes, and curing with hot air is crucial to achieving a good fastness level.

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