White cardboard
White cardboard is a kind of thick paper that is firm, thick, and has a larger basis weight. In the past, some people planned to divide the basis of quantitative basis: paper, cardboard and cardboard; in the early years, in Shanghai shopping malls, the weight of white and thick paper was about 200g/m2 (the surface is smooth, calendered, and the stiffness is high. Some people call it thin cardboard. ), call weighing heavy paper. In fact, it is also a kind of paper jam. The most common cardboard is not colored, and it is called white cardboard. If it is colored, it is called color jam.
The main purpose of white cardboard is to print business cards, certificates, invitations, covers, month calendars, and postal postcards.
White cardboard has the surname "White", so it has high requirements for whiteness. The whiteness of grade A is not less than 92%, grade B is not less than 87%, and grade C is not less than 82%. The whiteness is over 90%, which is a bit "bright and dazzling".
White cardboard is also required to have high stiffness, bursting resistance and smoothness (except for white cardboard with embossed patterns), the paper surface is flat, no streaks, spots and other paper defects, and no warpage The phenomenon of deformation occurs.
Coated paper
Single copper paper has bright surface, uniform coating, fast ink absorption and good printing adaptability, suitable for delicate color printing. For the purpose of fine printing, the surface of the base paper is coated with a coating process and is calendered by a super calender for ordinary coated paper.
Single copper is called single powder in the Pearl River Delta and Hong Kong. One side is coated smoothly, and the other side is rougher, but it can also be printed in single color or not very fine colors.
Coated paper is also divided into double copper and single copper, double copper is available from 80 to 400gsm, and single copper is 170 to 400gsm. If it is called coated paper directly, it usually refers to double copper.
Double-coated paper is divided into single-sided and double-sided coated coated paper. According to the Japanese paper industry classification standard, its coating amount per side is about 10g/m2 or more. It is currently the most commonly used in cultural publishing, advertising design, printing and binding, and industrial and commercial industries. One of the paper types.