Offset printed newspapers

The conversion of the offset printing process for newspapers to other print systems. 

The primary sources for the mineral oil contamination in secondary fibre-based packaging materials are the coldset inks from newspapers because offset printing is the dominating printing process for this type of graphic paper product in Europe. Offset coldset inks consist of up to 30% of mineral oil as solvent. In general, offset inks are available which are based on mineral oil-reduced or mineral oil-free... 

Finally, the conversion of mineral oil-based offset newspaper inks to mineral oil-free inks is the most promising option. In the sense of ecological actions, it is now the time to work seriously on this conversion which requires for sure further research needs. The developments on mineral oil-free inks stopped about 15 years ago have to be adopted on the new generations of offset printing machines. The deinkability of those inks causes promise to find fast industrial solutions eventually via a first step with mineral oil-reduced offset inks. Nevertheless, the deinkability found to be all right at that time has to be tested again. 

In this context, the question has to be raised about the contribution offset heatset inks make to the mineral oil problem in RCP. The inks themselves can contain a significant mineral oil content even when mineral oil-free inks are available on the market. During the drying process, the majority of the oils evaporate. Nevertheless, in RCP from offset heatset printed magazines, mineral oil constituents will exist even though on a much lower level than in recovered newspapers and despite the... 

Offset Litho 2K-10K 3-10 25 High resolution, high throughput, newspaper/ magazine printing... 

The importance of letterpress printing today is very much reduced by the cold-set offset process, whereby most of the newspapers are printed. Conventional newspapers are uncoated papers, based on recovered and deinked printing papers and/ or mechanical pulps. However, a coated surface of such a newspaper or another base paper made from a relatively cheap furnish opens new applications for the cold-set web-offset process with significant improved print quality and cost-performance (Fig. 7.7). 

---