Dorian paper is offset paper. Offset paper, formerly known as "Dowling Paper", is mainly used for printing high-grade color printed matter by lithographic (offset) printing machines or other printing machines, and is suitable for printing monochrome or multicolor book covers, text, inserts, pictorial, maps, posters, color trademarks and various packaging materials.
Dowling paper is divided into special number, 1 number, No.2 and No.3 according to the proportion of pulp, which has high strength and printability. There are single-sided and double-sided, and there are two grades of super calendering and ordinary calendering. Offset printing is a kind of advanced printing paper for books and periodicals, which requires high contrast, expansion rate and surface strength, and its acidity and alkalinity should be close to neutral or weakly alkaline, so as not to affect the printing paper.