chapter  4
Paper-Recycling System
Pages 18

There are various property requirements of papers and fibers, depending on the characteristics of the actual product the paper or board is used for. Basically, there are two general product groups for which paper and board are used: graphic products, such as newspapers, books, advertisements, and copies; and paper and board products, induding packaging papers and boards, household and sanitary papers, and construction papers. _

Inside these two groups there are various subgroups with specific property requirements, such as brightness, strength, grammage (area weight), thickness, and moisture re-formation. For large newspapers, for instance, it is essential to have paper with minimum thickness yet with maximum printing properties.