Screen printing

Printing process, screen printing

The technology associated with the screen printing process opens up a wide spectrum of application possibilities ranging from classic textile printing to high end applications. One example is the in-mold process, which is used for coating mobile telephones, among other applications.

In contrast to offset, gravure and flexo printing, not only flat substrates can be printed, but also three dimensional objects (e.g. glass, plastic or metal packaging). The selection of metallic pigments is organized by the desired optical effect and the ink technology (solvent-based, water-based, UV curable). Longer drying times permit the use of higher boiling solvents, so that pastes in white spirits, mineral oil, glycols, etc. can also be used. The fineness of the metal pigments used should correlate to the mesh size of the sieve - the d50 size value should not exceed one-third of the sieve mesh size. For larger special effects such as sparkle effect the mesh size must be adjusted according to the pigment size.

Based on the technological requirements and the wide variety of applications, SCHLENK provides the entire metal pigment product range (aluminium and gold bronze, leafing and non-leafing) in powder, paste and granule form. DECOMET® pigments in the 4000 and 5000 series can produce effects that are similar to those achieved with foil when the right process is used.

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Methoxy propanol (PM) aluminium paste

Special solvent pastes designed for use with specific formulations are available for use in gravure, flexo and screen printing inks. Selection is based on the printing process and drying speed requirements, as well as on the substrate limitations.

D 50 value [µm] Solid content Solvent Application
PM/990 17 65 Methoxypropanol
PM/1190 13 65 Methoxypropanol
PM/1380 10 65 Methoxypropanol
PM/2140 13 65 Methoxypropanol

PP aluminium powders

PP aluminium powders are brilliant leafing aluminium powders for gravure, flexo and screen printing applications.

For improved processing safety, pastes that contain solvents or water-based pastes are also available.

D 50 value [µm] Solid content Application
PP/980 17 100
PP/1180 13 100
PP/1380 10 100
PP/780 20 100

Alucar®

Similar product form to the Alumet paste but with a narrower particle size distribution. This achieves more brilliant effects (with less coverage).

D 50 value [µm] Solid content Solvent Application
Alucar 2600 24 65 +/- 2 white spirit / aromatics
Alucar 2900 11 65 +/- 2 white spirit / aromatics

Alumet®

Standard non-leafing, cornflake-type aluminium pastes containing white spirit/aromatics.

D 50 value [µm] Solid content Solvent Application
Alumet 1500 22 65 white spirit / aromatics
Alumet 1700 18 65 white spirit / aromatics

Alushine®

Fine silver dollar pigment for high quality silver printing inks.

D 50 value [µm] Solid content Solvent Application
Alushine 7600 13 70 +/- 2 white spirit / aromatics

Alustar®

Very thin, fine, silver dollar pigment with the highest metallic brilliance. They are ideal for coloring with organic pigments and dyes and offer a combination of very good coverage and printability.

D 50 value [µm] Solid content Solvent Application
Alustar 8500 15 60 +/- 2 white spirit / aromatics

Aquador®

The Aquador® series includes stabilized water-based pastes in a fineness range of 5–50 µm. They are successfully used in water-based gravure, flexo and screen printing inks.

Colors: Rich gold, rich pale gold and pale gold (other colors by request) Form of delivery: Water pastes

D 50 value [µm] Solid content Solvent Application
Aquador 2210 50 70 water
Aquador 2250 35 70 water
Aquador 2580 20 70 water
Aquador 3050 11.5 70 water
Aquador 4160 5 70 water
Aquador 4220 9 70 water
Aquador 4310 10 70 water

Aquamet®

Stabilized, non-leafing aluminium water pastes with various particle morphology (both "cornflakes" and "silver dollars") for water-based gravure, flexo and screen printing inks.

D 50 value [µm] Solid content Solvent Application
Aquamet NPW/1700 18 60 water
Aquamet NPW/2900 11 60 water
Aquamet NPW/8500 15 65 water
Aquamet NPW/3200 56 60 water
Aquamet NPW/3400 34 60 water
Aquamet NPW/2600 24 60 water

Aquasilber®

Stabilized, leafing aluminium water pastes for water-based gravure, flexo and screen printing inks with gassing stability.

D 50 value [µm] Solid content Solvent Application
Aquasilber LPW/980 17 65 water
Aquasilber LPW/1180 13 65 water
Aquasilber LPW/1380 10 65 water
Aquasilber LPW/2140 13 65 water

Constant®

Inorganic coated gold bronze pigments that have a significantly higher resistance to temperature and chemicals than the basic pigments in the Luminor® series. They are primarily used in screen printing inks with aggressive formulation components and for high resistance requirements.

Colors: Rich gold, rich pale gold and pale gold (other colors by request) Form of delivery: Powders

D 50 value [µm] Solid content Application
Constant 2210/N 50 100
Constant 2250/N 35 100

Decomet®

Decomet® is the product name for vacuum metalized pigments (VMPs) by SCHLENK. The manufacturing process makes these pigments extremely thin, and in appearance they are extremely smooth and highly reflective when being applied on foils.

Decomet pigments can be used in sheetfed offset, gravure, flexo and screen printing inks. They can achieve effects similar to those produced with metalized substrates and foils, and because they are non-leafing, the effects can also be tinted with color pigments. Special compositions for water-based and UV curable inks complete the range of this highly attractive product range.

D 50 value [µm] Solid content Solvent Application
Decomet 2010/10 12-15 10 methoxy propanol
Decomet 3010/10 11-14 10 methoxy propanol
Decomet 4010/10 11-14 10 methoxy propanol
Decomet 4033/10 11-14 10 butyl glycol
Decomet 4077/10 11-14 10 3-Methoxy-3-methyl-butylglykol (MMB)
Decomet 1050/10 12-15 10 water
Decomet UV 2798/20 12 20 TMPEOTA + stabilizer
Decomet 5277/10 7 10 methoxymethyl butanol

Grandal® W

Grandal® W are aluminium granules for water borne systems based on non-leafing aluminium pigments.

D 50 value [µm] Solid content Solvent Application
Grandal W/170 6 80 urea-aldehyde resin
Grandal W/8500 15 80 urea-aldehyde resin
Grandal W/2900 11 80 urea-aldehyde resin
Grandal W/9600 13 80 urea-aldehyde resin
Grandal W/9800 8.5 80 urea-aldehyde resin
Grandal W/8500 15 80 water
Grandal W/9600 13 80 water
Grandal W/9800 8.5 80 water

Grandal®

Grandal® products are aluminium pellets offered by SCHLENK and typically consist of approx. 95% pigment and 5% binder. They allow dust-free processing, are easy to dose and disperse, and can be used in a variety of formulations because unlike pastes they do not contain specific solvents.

Both leafing and non-leafing aluminium pigments are available in this delivery form, along with Grandal W versions for water-based printing inks and in the Grandal 170 for energy curable systems.

D 50 value [µm] Solid content Solvent Application
Grandal 140 13 95 urea-aldehyde resin
Grandal 170 6 95 urea-aldehyde resin
Grandal 1800 14 95 urea-aldehyde resin
Grandal 2140 13 95 urea-aldehyde resin
Grandal 2900 11 95 urea-aldehyde resin
Grandal 6900 15 95 urea-aldehyde resin
Grandal 7600 13 80 urea-aldehyde resin
Grandal 8500 15 80 urea-aldehyde resin
Grandal 9600 14 80 urea-aldehyde resin
Grandal 9800-2G/80 8.5 80 carrier resin
Grandal 7950/95 6 95 urea aldehyde resin

Grandor®

The Grandor® types are pigment preparations in pellet form consisting of approx. 95% pigment and 5% binder for solvent based gravure, flexo and screen printing inks. The Grandor W series (with a water soluble carrier resin) are available for water-based systems.

Colors: Rich gold, rich pale gold and pale gold (other colors by request) Form of delivery: Dust-free pellets that are easy to dose.

D 50 value [µm] Solid content Solvent Application
Grandor 4220 9 95 urea-aldehyde resin
Grandor 4270 4 95 urea-aldehyde resin
Grandor 4320 9 95 urea-aldehyde resin
Grandor 4330 8 95 urea-aldehyde resin
Grandor 4350 6 95 urea-aldehyde resin
Grandor 4360 5 95 urea-aldehyde resin
Grandor 426 n.l. 9 95 urea-aldehyde resin

Luminor®

The relatively coarse types in the Luminor® series (d50 from 20 – 50 µm) are primarily used in the screen printing process and, due to their particle sizes, they produce highly brilliant metallic effects.

Form of delivery: Powder and water-based Aquador compositions in paste form (conventional solvents by request).

D 50 value [µm] Solid content Application
Luminor 2210 50 100
Luminor 2250 35 100
Luminor 2550 35 100
Luminor 2580 20 100

Metaface®

Metaface® aluminium powders that provide high brilliance, good coverage and excellent printability. They are available as powders, water-based pastes or UV pastes.

D 50 value [µm] Solid content Solvent Application
Metaface 2140 13 100 -
Metaface UV-TE/2140 13 65 Oligodiacrylat

Multiprint®

The pigments in the Multiprint® series are in a fineness range from 4 to 10 µm and correspond with the optical requirements, the desired coverage and the process parameters on the printing machine.

Colors: Rich gold, rich pale gold and pale gold (other colors by request) Form of delivery: Powder, pastes in ethyl acetate (or other solvents), as water-based Aquador® pastes, as UV pastes and as Grandor® granules for solvent based printing inks and Grandor® W for water-based printing inks. Use in gravure and flexo printing inks and in screen printing.

D 50 value [µm] Solid content Application
Multiprint 4117 9.5 100
Multiprint 4120 8 100

Reflex®

Particularly coarse pigments with a particle size (d50) of > 50 µm that produce highly brilliant effects in a bronzing process.

Colors: Rich gold, rich pale gold and pale gold (other colors by request). Form of delivery: Powders

D 50 value [µm] Application
Reflex 1130 42
Reflex 1140 42
Reflex 1150 42
Reflex 1540 50
Reflex 1711 65

UV

VOC-free paste forms in oligoacrylates are available for use in UV curable offset, gravure, flexo and screen printing inks. These can be found under the ""UV"" product designation.

Colors: Rich gold, rich pale gold and pale gold (other colors by request) Form of delivery: Pastes

D 50 value [µm] Solid content Solvent Application
UV/4160 5 80 Oligodiacrylat
UV/4360 5 80 Oligodiacrylat

Zenexo®

Zenexo® UTP Colored Aluminium Effect Pigment in powder form. First available pigment with a D50 value of 21µm. Effect Pigments can be used in solvent, waterborne and UV coatings and printing ink systems. Zenexo® provides outstanding coloristic features, i.e. hiding power, color intensity, flop and gloss. Application areas: Powder Coatings, Industrial Coatings, Plastics and Screen Printing

D 50 value [µm] Solid content Application
Zenexo GoldenShine 21 YY 21 100

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