Study On Lithographic Offset Printability Of Coated Fine Papers

The quality of coated fine papers is largely determined by printability of the papers. Establishing relationships between printability and properties of the paper will help paper mills to produce better quality papers.11commercial high-gloss coated fine papers produced by major China papermakers were collected and analyzed for their fiber compositions and printability properties. We find that environmentally friendly high yield pulps (HYP) are being increasingly used in the manufacturing of coated fine papers although they are traditionally mainly made of chemical pulps. It was found when HYP content was lower than15%, the addition of HYP to base papers had little or no effect on printability properties of the papers. However. HYP-containing (especially at high HYP addition level) coated paper may loss brightness stability under prolonged UV radiation.We have these11coated papers printed. We found that paper surface characteristic, such as paper gloss, print gloss (lab), paper smoothness and K&N value play an important role on color reproduction in the aspects of print gloss, relative contrast value and so on. However, these properties have no effect on solid density which was determined only by the amount of ink transferred. In addition, the HYP content have no effect on print visual sense if the paper has good brightness stability, otherwise, the print quality will be affected a lot. So inhibiting HYP yellowing is essential.