Decoloring

Plastics that have previously been colored by Smart Coloring Technology can be decolorized. The decolorization takes place in an aqueous decolorizing bath at elevated temperature with the addition of dye absorbing systems. The plastic "opens" and releases the dye. The dye is absorbed and removed from the washing water. Plastics can be re-colored due to the remaining additive. Accordingly, it can make sense to decolorize plastic parts as a whole and to dispense with shredding.

step 1

ADD OUR TECHNOLOGY

Suitable combinations of additives and dyes that ensure the absorption and migration-stable storage of the dyes are used to implement the technology into plastics. The additive is added to the plastic in form of a master batch. Depending on your requirements, we use standard master batches or manufacture your individual one based on your own plastic granulates.

step 2

EXTRUDE JUST WHITE OR CLEAR

The additives or master batches are designed in such a way that a perfect extrusion and homogeneous distribution is guaranteed and the intrinsic properties of the plastic matrix remain unchanged.
You only extrude in white or clear. Colour changes, which are associated with high time and material losses, are avoided.

step 3

COLOR OR DIGITAL INPRINTING

The introduction of dyes takes place by immersing the plastics in aqueous dye baths or via water based inkjet under activation. The dye penetrates into the plastic and is trapped there.

step 4

DECOLOR TO CLEAN FLAKES

The dyes can be removed by means of an aqueous decolorising bath under selected conditions. Unintended migration or color bleeding during application is avoided by a special key-locker principle.

Mechanistic Fundamentals of Smart Coloring Technology

As mentioned above, plastics that have previously been colored by Smart Coloring Technology can be decolorized.

The decolorization takes place in an aqueous decolorizing bath at elevated temperature with the addition of dye absorbing systems. The plastic "opens" and releases the dye. The dye is absorbed and removed from the washing water.

Plastics can be re-colored due to the remaining additive. Accordingly, it can make sense to decolorize plastic parts as a whole and to dispense with shredding.

The dyes can be removed by means of an aqueous decolorising bath under suitable conditions for reactivating the plastic.

The contamination of the washing water is avoided by appropriate and easily removable cleaning beads that absorb the resolved dye out of the washing water.

Unintended migration or color bleeding during application may not occur thru the key-locker principle.

      

   

    

Decoloring of colored shreddered caps: The decolorization result mainly depends on the temperature and the duration of the decolorization process. Flakes offer a larger surface area and are easier and more efficient to decolorize than complete parts.