Newsprint

Newsprint is a paper, which is characterized by a short lifetime ( 10 to 50 years, with good storage even longer) and poor weather resistance is characterized ( a property that is not particularly respected in books ). In contrast, it is comparatively inexpensive and has good printing properties such as a high degree of true color. It is also very light, easily foldable and manageable. It is (at least to a large extent ) is made of recycled waste paper. The newsprint used today for more than 100 years already served as the basis for daily and weekly newspapers, but not for magazines, in their paper other requirements are provided.

The environment is marred by discarded newsprint, but little affected, since it rots in appropriate conditions after a few months.

The reason why newsprint is yellowed with time at ( sun) light exposure and oxygen supply that it does not consist of pure cellulose, but also lignin is still included. The yellowing is an intense smell of vanillin, a degradation product of lignin developed. The yellowing effect can be reduced by the bleaching of lignin -containing pulp, for example, with sodium dithionite. In almost all other commercially available papers this is chemically removed, but this would be for newspapers to the detriment of the reader. Because the lignin gives not only the fiber composite in the tree, the toughness, but also the fiber composite in the paper. Due to the small thickness of a paper newspaper and the relatively large area, a wood-free paper would it just hang limp at the corners and everywhere bend (similar to Bible paper ). Lignin increases the opacity low so - the printing of the paper backing showing through, woodfree paper, however, is translucent - in reflected light.

The Voith PM 1 - set at the company Rhein Papier in Hürth - presented in 2003 with 1,912 m / min (corresponding to a movement of the web with its 115 km / h) a world speed record in the production of newsprint on.