Coloring

The key-locker principle of subsequent coloring of plastic films, parts or general objects bases on the ability of these plastics to firmly store organic and/or inorganic components such as dyes in the plastic matrix. The plastics receive this ability by the addition of corresponding additives. Furthermore, suitable dyes are needed that migrate under certain conditions but do not show any unintentional bleeding. The basis of our technology for the reversible coloring of plastics is therefore a selected additive-dye combination.

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 BY ENCAPSULATION

The introduction of dyes takes place by immersing the plastics in aqueous dye baths under activation. The dye penetrates into the plastic and is trapped there. Color intensity and penetration depth can be adjusted by various parameters.

step 4

DECOLOR TO CLEAN FLAKES

The dyestuffs 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, the key-locker principle of subsequent coloring of plastic films, parts or general objects bases on the ability of these plastics to firmly store organic and/or inorganic components such as dyes in the plastic matrix.

Some plastics can be dyed with our dyestuffs without the necessity of additivation. Here, however, the dyestuffs are not firmly bound to the plastic matrix, so that uncontrolled migration might occur. This makes its use in some applications such as direct food contact impossible.
Our additives prevent unintended migration through the key-locker principle. Nevertheless, we strongly recommend to carry out application-specific tests.

By adding additives to the plastics the basic possibility of coloring as such, sufficient storage capacity for dyestuffs and ways of removing the dyestuffs are created. Accordingly, dyeing is only carried out in that areas where the additive has been added, e.g. in the case of multi-layer laminates only in individual layers.

The addition of additives accelerates the dye migration and ensures efficient processes.

Only the dotted area contains the additive. At the phase boundary to the non-additive area there is a sharp migration barrier for the dye. Selective coloring e.g. of multilayer plastics is simply realized by selective additivation only of the parts to be colored (Body-Skin-Concept).

   

   

    

The cross section of the colored plastics shows the sharp phase boundary between the additive and the non-additive phases.