PROOFING INKS
UNIVERSA^® 6800

  DIN 16 539 / ISO 2846

Our new generation of process inks for sheet-fed offset printing requires an appropriate set of proofing inks which, when used in flat-bed presses with cooled bed, permit to largely simulate the result of the press run.

The concept presented here consists of three series of highly transparent process inks which are adjusted to identical viscosity and tack. The dot gain corresponding to practical conditions is achieved with different pigmentations. The basic formulation corresponds to the pigmentation of the European scale DIN 16 539 / lSO 2846. The pigmentations of the other two series are each graduated to produce 3 to 5 per cent higher densities in the middle tone. This method brought better results than the adjustment of consistency by the addition of pastes or oils.

However, proofing conditions may change from day to day. This occasionally requires to mix differently pigmented inks. Normally this will not cause any problems. The proofing inks are of course formulated to prevent skinning, even during prolonged breaks. Experience has shown that the addition of 2 to 3 per cent HYDROFIX-S 8061 09 to the damping fluid keeps the plate wet for a longer period and protects against corrosion.

 

Basic formula	UNIVERSA Yellow 41 AA 6800 UNIVERSA Magenta 42 AA 6800 UNIVERSA Cyan 43 AA 6800
Slightly higher dot again	UNIVERSA Yellow 41 AB 6800 UNIVERSA Magenta 42 AB 6800 UNIVERSA Cyan 43 AB 6800
Even higher dot again	UNIVERSA Yellow 41 AC 6800 UNIVERSA Magenta 42 AC 6800 UNIVERSA Cyan 43 AC 6800
For all process inks	UNIVERSA Black 49 A 6001 solvent fast

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