| Résumé : |
The author looks at coating options, pilot runs and quality control in printing and converting applications.
Coating is defined, for the purposes of this article, as any material in liquid form consisting mainly of a mixture of resins, pigments and diluents formulated for application onto flexible substrates. These will include printing inks, varnishes, adhesives, either water or solvent based, as well as radiation curable surface coatings.
All the processes discussed in this paper can be carried out on the Rotary Koater.
In printing, converting, packaging and other application areas the number of different coating mixes available number several thousand, with each mix specifically formulated to provide various performance properties or to visually enhance the finished product. The substrates onto which the coating, whether ink, lacquer or silicone for release papers is to be applied are varied and can include different paper grades, boards, films, foils, etc. A wide range of coating systems are used together with specially developed equipment for pilot runs, product testing and feasibility studies.
The following short description's, outline some of the main methods available but consideration must be given to both the advantages and disadvantages offered by each. These include capital investment, ease of use, process speed, coating quality and future requirements. |
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Making choices in POLYMERS PAINT COLOUR JOURNAL - PPCJ, Vol. 192, N° 4457 (10/2002)
