Influence of the Substrate Properties on the Offset Printing ink Colour Matching
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| Title | Influence of the Substrate Properties on the Offset Printing ink Colour Matching |
| Authors | |
| Abstract | The printing industry has been using computerised ink colour matching for a long time. The problem of ink formulation is to match a given standard colour with only three or four inks from a basis of about twelve inks.This is generally achieved by calculations based on the well-known Kubelka-Munk turbid media theory, which gives excellent results in many industrial situations. However, some hypotheses are necessary to apply the Kubelka-Munk model and corrections to the measured reflectance are often required (Saunderson’s correction coefficients, for example).One limitation in the resolution of this method of formulation may arise from the fact that the characterisation of the basic inks is made on one standard substrate, which may differ a lot from the real printing substrate.The aim of this work is precisely to study the contribution of the substrate to the colour matching procedure. The properties of the substrate which intervene in the process are physical properties (thickness, absorbency…) and optical properties (brightness and gloss). Five different papers were chosen to make the characterisations of the basic offset inks. The reflectance measurements were performed with spectrophotometer X-Rite with the D/0° geometry, specular excluded or included, coupled with a coloured matching software (X-Rite Inkmaster). A special emphasis was put on the influence on the calculation of the ink film thickness, estimated for the different substrates, and on the choice of the correction coefficients for the Kubelka-Munk theory. |
| Publisher | Acta Graphica |
| Date | 2003-07-04 |
| Source | Acta Graphica Vol 15, No 2 (2003) |
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