These articles have been prepared for pressroom staff to provide them with a useful aid in their daily work with both flying paster and zero speed splicer technologies. A general guide cannot take into account the specificity of all products, and therefore we recommend that it is used in addition to information from your suppliers, particularly the manufacturers of equipment whose safety, operating and maintenance procedures must take preference over the contents of this guide. Some papers are produced to specifically suit either the gravure or offset production process. For example, a gravure grade printed offset will have less strength, and often exhibits surface piling and difficulties with dampening-ink interaction. Minimum moisture content for printing is around 3 percent, from this point on, paper will cause high static electricity with possible interference to press electrical equipment, missed splices and difficulties with the folder and off-line finishing.
All grades can contain a percentage of recycled fiber.
This does not significantly affect the physical or optical properties of these papers, except that they may be more dense and heavier for a given roll diameter. All grades are manufactured to conform to customer requirements of cost, print quality and runability. Optical properties are generally defined by brightness, shade and opacity. Most web offset papers are a blend of two types of pulp to provide a paper with a balance of properties and value. Mechanical pulp provides good opacity but has low brightness and relatively weaker fiber strength.