Printing and Press Papers

Printing and press papers are divided into the following four subgroups  

Coated printing papers (wood-containing and wood-free). 

Newsprint represents an important subgroup. It consists primarily of a mixture of primary and secondary fibers (0-100%). The primary fibers include groundwood and small amounts of chemical pulp, which are used to increase strength. The main field of application is newspaper production. Other uses are, e.g., paperbacks, calculating-machine roUs, and interleafing paper. 

Newsprint has a basis weight of 40-49 (in certain cases up to 54) g m . It is machine-finished or supercalendered. Standard newsprint should have an ISO brightness of 57-60%. 

Improved newsprint has a high filler content and is calendered to obtain a more closed surface. It is used, e. g., for book and offset printing. The ISO brightness is about 10 units higher than the mean brightness of standard newsprint [14], 

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Paper and Board Grades and Their Properties n. 2.1.1 Printing and Press Papers [13]... 

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