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Offset ink formulations are based on the following constituents:
Principal functions
Siccative vegetable oils (soya, linseed, wood, rape)
20 – 40%
Vegetable oils are used for solubilising the resins, wetting and coating the pigment and influence the drying.
Petroleum (aliphatic, paraffinic, etc.) or vegetable based diluents
3 – 40%
Diluents are firstly used for solubilising the resins and then to obtain the rheological properties of the final ink.
Modified rosin or oil based resins
30 – 35%
Essential constituents of varnishes (resins + oils) that determine the required rheological, setting, tack, etc. properties of the ink.
Organic or mineral pigments
10 – 20%
Colouring materials chosen as a function of the required applications and fastnesses.
Additives: fillers, waxes, drying agents, etc
1 – 8%
These products determine or influence specific properties such as rheology, abrasion resistance, drying, etc.
Typical offset ink formulation
Vegetable oil based inks
The varnishes and diluents used in the formulation of these inks are exclusively vegetable based and renewable. However, the fillers, pigments and drying agents are mineral based. For this reason, no ink is 100% vegetable.
These inks provide numerous advantages for the printer:
• Better transfer, giving more intense, glossier colours and reduced ink consumption.
• Better ink / water stability, enabling high speed printing (up to 18000 sheets/hour) and reduced waste.
• Better environmental management: reduction of VOCs (Volatile Organic Compounds), easier recycling of printed materials, etc.
However, they have a strong odour and cannot be used for printing foodstuff packaging because they can have an adverse effect on the organoleptic pro- perties of the packaged goods.
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