Best Gold Pearlescent Pigment Solutions


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Place: Shanghai, China

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Jiangsu Pritty Pearlescent Pigment
Fumin Road 399
223800 Suqian, China

 


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sales@prittypigments.com

+86   21 6405 8221

+86 150 2681 0392

 

 

 

Solutions for Printing

The majority applications with pearlescent pigment in the printing industry are packages, publications, home decorations, clothes, ceramic products and home appliances. However, to achieve a satisfactory final pearl effect, one must adjust the ink, machinery, and other related inputs accordingly.

Flexography printing, offset printing, gravure printing and screen-printing are the most widely used printing methods worldwide. Each method has unique advantages and special applications.

Compared to traditional pigments, the components and structure of pearl pigments are quite different:

 

Pritty Iridesium®  for Printing Industry

Large particle size. 5 - 25 µm

 

Difficult  to transfer pearl pigments to the substrate

Ideal for offset printing 0.02 - 0.08 µm and carbon black size 0.2 - 0.7 µm

Thin platelet structure Not easy to transfer pearl pigments during the printing process
Low and medium speed usage to transfer pearl pigments during the printing process. High speed is not allowed
Pearlescent pigment surfaces consist of many grooves Give a high surface performance

* Test conducted by Atlas South Florida Miami, USA.

 

Pearlescent pigments how to use in Printing Industry

  • Pre-wetting: For solvent ink systems, we recommend pre-wetting pearlescent pigments with a solvent (such as ethyl alcohol, thinner or just water) in the ink system. Leave the pearlescent pigments in the solvent for a few hours to absorb as much solvent as possible before mixing pearlescent pigments into ink system. This will achieve a better dispersion and stop pearlescent pigments from clogging the scraper.

  • Dispersion: pearlescent pigments are easy to disperse. In low viscosity ink systems, low speed stirring is enough. We do not recommend using three-roller mill, high-speed disperse or grinding machine to avoid damage to pearlescent pigments and potentially losing the pearl effect. We suggest to adding pearlescent pigments to the ink system at the last manufacturing step to minimize damage to its structure. During the mixing process, se a fixed low speed and shorter time is recommended.

  • Transparent ink media: transparency of the ink is the key factor for pearl effect ink. Always use transparent ink or binder; otherwise it will significantly affect the final pearl effect.

  • Pigment distribution: when the pearlescent pigments are distributed better and more even in the ink, a greater pearl effect can be achieved: The pearlescent flakes must parallel to the substrate surface to obtain a wonderful optimal pearl effect.

  • Ph Value: When pearlescent pigments are used in the waterborne alkaline ink system, alkaline additives (like NH4OH) should be used to adjust the PH of pearlescent pigments surface. If one is using an alkaline thixotropic agent to adjust the ink viscosity, and the PH of the pearlescent pigments surface is lower than 7, it is necessary to adjust the PH of the pearlescent pigments surface to avoid pigments massing together or adverse changes on the ink viscosity.

  • Dosage: The normal pearl pigment loading quantity of the finished ink should be 15 - 25% (this proportion needs to be adjusted according to the printing method and desired final result).

  • For Pritty Interference pearlescent pigments do not mix two or more colours together, otherwise the pearl effect will be diminished or lost.

  • Mesh size: Because pearlescent pigment particle sizes are bigger than conventional pigments, one must be careful about the mesh of the cylinder. When using 5 - 25 µm pearlescent pigments (average particle size 12 µm), the appropriate mesh should be 75 - 100 lins/cm; when using 10 - 60 µm (average particle size 25 µm), the ideal mesh should be 60 lines/cm or less. For solvent ink, 50 µm mesh is recommended, but in this case the ink film will become very thick, therefore the drying temperature must be adjusted.

  • Manufacturing speed: after the ink is transferred from cylinder to paper, make sure the ink has enough time on the paper so the pearlescent pigments pallets and the substrate surface are completely parallel to achieve the best pear effect

  • Substrate surface: To achieve the best pearl effect while using Pritty pearl pigments, the substrate should have a flat and smooth surface