the application of mineral science imerprint 07k · a lower amount of ink is required on the print...
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ImerPrint™ 07K For optimised print performance of lithographic inks
T H E A P P L I C A T I O N O F M I N E R A L S C I E N C E
A T T R I B U T E S
- High print density and ink mileage
- Increases ink viscosity and reduces
misting on printing plates
- Provides stable ink-fount solution behaviour
and good water uptake without kaolin washout
- Allows up to 20wt% addition
level into printing ink formulations
IMERPRINT™ 07K
ImerPrint™ 07K
ImerPrint™ 07K is a fine kaolin, specifically designed to be used in offset inks andto optimise formulation cost withoutcompromising print quality.
Recommended addition levels vary between 5 - 20wt%
depending on colour and ink type (coldset or heatset).
Typical wt.% Blackoffset
Coloured coldset
Colouredheatset
Pigment 17-20 10-15 10-15
Resin / Varnish 3-18 10-20 35-50
Kaolin 5-10 10-20 5-10
Oil 50-65 ~50 30-40
Other additives 1-8 1-8 1-8
Magenta heatset genericformulation wt.%
Control - No kaolin
5%kaolin
10%kaolin
10%kaolin
Pigment 15 15 15 15
ImerPrint™ 07K 0 5 10 -
Standard kaolin - - - 10
Uroset 7150E 36 42 48 48
Webvar 1100E 40 27.5 15 15
Distillate 9 10.5 12 12
Print density at 1.2gsm ink loading on roller
1.47 (0.04) 1.50 (0.03) 1.51 (0.03) 1.48 (0.02)
% Tappi 75° print gloss at 1.5 print density on coated paper
81 80 74 76
% water / fount uptake 41 58 60 57
Turbidity of ink-fount emulsion (20 min mix)
0.05 0.3 0.4 1.2
Typical values: ImerPrint™ 07K
Mean psd d50 (µm) 0.7
Mass % >53µm 0.01
Surface area (BET m2/g) 15
Hegman dispersion (µm) 60
Oil absorption (g/100g) 46
Brightness (ISO R457) 80
G U I D E F O R M U L A T I O N S :
H E A T S E T I N K F O R M U L A T I O N E X A M P L E & P R I N T P E R F O R M A N C E
ImerPrint™ 07K is a hydrous kaolin with a natural pH around 5, making it inert/neutral in the presence of fountain solution.
Due to its hydrophilic character and fine platey structure, ImerPrint™ 07K allows good emulsification of the ink with
fountain solution on the printing press. When pigmented inks containing kaolin are in contact with fount solution, a good
and stable water uptake around 50% is obtained. The advantage of ImerPrint™ 07K compared to standard kaolins is that
it does not cause kaolin washout into the fount solution. This has been achieved by carefully controlling the kaolin feed,
chemistry and process route.
ImerPrint™ 07K is processed to a required fine particle size with a controlled top-cut (low amount of coarse particles).
It disperses well in ink varnishes, resulting in low Hegman values (less than 5–10µm) after bead milling.
The shape and mineralogy of ImerPrint™ 07K is particularly beneficial for imparting some gel structure or strength
to the ink. Such increase in viscosity significantly reduces misting on the printing press.
The use of ImerPrint™ 07K in lithographic inks gives good print performance and colour strength at high kaolin addition levels.
When a given amount of ink is applied on print rollers, high print density is maintained with increasing kaolin levels up to 20wt%
in coldset formulations.
In heatset, print gloss and density are maintained up to about 10wt% kaolin addition. For offset inks containing ImerPrint™ 07K,
a lower amount of ink is required on the print rollers to give acceptable print density compared to an ink containing a blocky
mineral extender. ImerPrint™ 07K therefore improves ink mileage and provides good pigment efficiency. ImerPrint™ 07K structure
also reduces ink penetration into paper fibres, resulting in better ink holdout onto the paper surface and reduced strike-through.
IMERPRINT™ 07K
ImerPrint™ 07K
ImerPrint™ 07K is a fine kaolin, specifically designed to be used in offset inks andto optimise formulation cost withoutcompromising print quality.
Recommended addition levels vary between 5 - 20wt%
depending on colour and ink type (coldset or heatset).
Typical wt.% Blackoffset
Coloured coldset
Colouredheatset
Pigment 17-20 10-15 10-15
Resin / Varnish 3-18 10-20 35-50
Kaolin 5-10 10-20 5-10
Oil 50-65 ~50 30-40
Other additives 1-8 1-8 1-8
Magenta heatset genericformulation wt.%
Control - No kaolin
5%kaolin
10%kaolin
10%kaolin
Pigment 15 15 15 15
ImerPrint™ 07K 0 5 10 -
Standard kaolin - - - 10
Uroset 7150E 36 42 48 48
Webvar 1100E 40 27.5 15 15
Distillate 9 10.5 12 12
Print density at 1.2gsm ink loading on roller
1.47 (0.04) 1.50 (0.03) 1.51 (0.03) 1.48 (0.02)
% Tappi 75° print gloss at 1.5 print density on coated paper
81 80 74 76
% water / fount uptake 41 58 60 57
Turbidity of ink-fount emulsion (20 min mix)
0.05 0.3 0.4 1.2
Typical values: ImerPrint™ 07K
Mean psd d50 (µm) 0.7
Mass % >53µm 0.01
Surface area (BET m2/g) 15
Hegman dispersion (µm) 60
Oil absorption (g/100g) 46
Brightness (ISO R457) 80
G U I D E F O R M U L A T I O N S :
H E A T S E T I N K F O R M U L A T I O N E X A M P L E & P R I N T P E R F O R M A N C E
ImerPrint™ 07K is a hydrous kaolin with a natural pH around 5, making it inert/neutral in the presence of fountain solution.
Due to its hydrophilic character and fine platey structure, ImerPrint™ 07K allows good emulsification of the ink with
fountain solution on the printing press. When pigmented inks containing kaolin are in contact with fount solution, a good
and stable water uptake around 50% is obtained. The advantage of ImerPrint™ 07K compared to standard kaolins is that
it does not cause kaolin washout into the fount solution. This has been achieved by carefully controlling the kaolin feed,
chemistry and process route.
ImerPrint™ 07K is processed to a required fine particle size with a controlled top-cut (low amount of coarse particles).
It disperses well in ink varnishes, resulting in low Hegman values (less than 5–10µm) after bead milling.
The shape and mineralogy of ImerPrint™ 07K is particularly beneficial for imparting some gel structure or strength
to the ink. Such increase in viscosity significantly reduces misting on the printing press.
The use of ImerPrint™ 07K in lithographic inks gives good print performance and colour strength at high kaolin addition levels.
When a given amount of ink is applied on print rollers, high print density is maintained with increasing kaolin levels up to 20wt%
in coldset formulations.
In heatset, print gloss and density are maintained up to about 10wt% kaolin addition. For offset inks containing ImerPrint™ 07K,
a lower amount of ink is required on the print rollers to give acceptable print density compared to an ink containing a blocky
mineral extender. ImerPrint™ 07K therefore improves ink mileage and provides good pigment efficiency. ImerPrint™ 07K structure
also reduces ink penetration into paper fibres, resulting in better ink holdout onto the paper surface and reduced strike-through.
ImerPrint™ 07K
Overall, ImerPrint™ 07K offers a combination of reduced ink misting, improved lithotronic behaviour
and good printability, allowing higher addition level into printing inks formulation and delivering
a more effective cost-performance solution.
Optical cross-section image of a coldset ink
containing ImerPrint™ 07K printed on newsprint
SEM tilted image of printed ink surface
showing alignment of kaolin plates
F O R M O R E I N F O R M A T I O N
t: +44 (0)1726 818000 f: +44 (0)1726 811200 [email protected] imerys-kaolin.com
UKP_I001 - FIRST EDITION - 03/17
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wt% ImerPrint™ 07K in ink Ink amount on rollers g/m2
0 5 10 15 20 0 1.5 2 2.5 3
Yellow coldset ImerPrint™ 07KMagenta heatset Blocky extender