Some questions about printed materials (2)

What is offset paper?

Offset Printing paper, ie, offset printing paper, was originally purchased from Hong Kong Doolin Co. Offset paper is widely used in the printing industry in China, and it is used for offset printing from offset presses. The main use of this paper is to print color pictorials, pictures, illustrations, trademarks, posters, etc., and its quantitative 60 ~ 180g / m  2 kinds, with 60 ~ 150g / m  2 of the most common use. Generally flat paper, specifications 787 × 1092mm and 850 × 1168mm and so on. Divided into A, B, C3 level.
A, B grade offset printing paper is used for advanced color printing; C grade offset printing paper is used for ordinary color printing. Grade A and B offset papers are usually made from 100% bleached softwood pulp or with bamboo pulp, cotton pulp, or ryegrass pulp. Sometimes it is supplemented with about 20% of other bleached pulp, but it cannot be used with groundwood (it will affect the color printing). Grade C offset paper uses 50% bleached wood pulp and can also be blended with a portion of cotton pulp or bamboo pulp. Grass pulp should not exceed 50%, using long fiber free beating, with a filler content of 20 to 30%. Some grade A and B offset papers also have surface sizing to increase paper smoothness and water resistance.