Offset printing using different paper grades, which differ from one another in use, weight, quality and other parameters. There are many parameters that determine the characteristics of the paper:. Optical, physical, mechanical, chemical and other customers and designers are primarily interested in settings such as brightness, opacity, density and texture. And options such as mechanical strength, drying shrinkage, porosity, strength of character cover electrified more concerned printers and technologists. Let’s look at some of these options. Paper weight – determines the weight of a sheet of paper in the city with an area of 1 m². In offset printing is most commonly used types of securities with a density of between 60 and 300 g / m².
The density of newsprint – 45-60 g / m²; Xerox – 80 g / m²; Paper cards – 200-250 g / m²; for brochures and leaflets – 100-170 g / m²; calendars and posters – 135 to 200 g / m².
Glossy (the characteristic is opaque). Glossy image is more saturated colors and is recommended for printing color images. But on the other hand, it is not recommended for printing large quantities of small text on glossy paper – because of high contrast and brightness will quickly tired eyes.
White – the ability to reflect light paper. It is expressed by the reflectance (the ratio of reflected light intensity of incident). White paper ranged from 60 to 98%. The biggest contrast between the elements of the print and background, the better the printed image is perceived.
Openness – ability to paper to transmit light without distraction. In most cases, such characteristics of the paper considered a disadvantage because the printing on the back of the paper is visible. Types of securities, most often used in the printing industry
Glossy paper – the most popular type of paper in the printing industry (especially advertising). It has a surface which is coated with a special adhesive, which hides the fiber. It is smooth, uniform pressure and a very high degree of whiteness.
Covered – this book has a special polymer film of different colors on the surface. It is characterized by high reflectivity. It is used to create business cards, covers and folders.
With relief – in the production of this book uses a special process for the surface treatment with the use of models for relief. There are many variations of this model Surface: frost, ivory linen, cold, etc.
Adhesives – paper and the back of the adhesive layer which is covered with easily removable protective paper. There is a huge variety of colors, and coated and uncoated paper, transparent and metallized. The most common adhesive paper used as a label on the containers of plastic and glass, labels on the body of a variety of devices, advertising in public transport.
Carbonless – it lets you copy original paper by writing pen or typewriter, without the use of indigo. For such documents with paper of different colors, and each of the next sheet by using a different color. It is important that the correct location and order of priority of such plates.
Cardboard – is characterized by rigidity, thickness and weight.
Special grades of paper – Paper with microscopic inclusions (tengris, flannel) and special surface structure (cashmere). It is used to create special artistic effects.