White cardstock is a kind of solid and thick paper with large quantity. Once upon a time, some people planned to divide paper, cardboard and paperboard on the basis of ration; in the early years, in Shanghai shopping malls, white thick paper with a ration of about 200g / ㎡ (with smooth surface, high stiffness after calendering, also known as thin board) was called weighing paper. In fact, it is also a kind of paper jam. The most common paperboard is not colored. It is often called white paperboard. If the color, according to the color called color card.
White card paper is mainly used for printing business cards, certificates, invitations, covers, calendars and postcards.
White card paper is named “white”, so it requires high 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%. If the whiteness is more than 90%, it will be a little “bright and dazzling”.
White card paper also requires high stiffness, bursting resistance and smoothness (except for white card paper with embossed pattern). The paper surface shall be flat, free of paper defects such as streaks and spots, and free of warping and deformation.
The surface of single copper paper is bright, the coating is even and the ink absorption is fast. It has good printability and is suitable for delicate color printing. For the purpose of fine printing, the surface of the base paper is processed by coating, and the surface of the base paper is calendered by a super calender.
Double copper paper is divided into single-sided and double-sided coated copper plate paper. According to the Japanese paper industry classification standard, the coating capacity of each side is about 10g / ㎡, which is one of the most commonly used paper types in cultural publishing, advertising design, printing and binding, and industry and commerce.
Double offset paper refers to printing paper, also known as offset paper. Books like ours are printed with double offset paper (but the surface of the paper for fashion magazines like Rayleigh is slippery, and the paper coated with glossiness is called double copper paper). Generally, between 60g and 120g, there are also 150g high-weight double offset paper. The paper less than 60g is not called double glue but writing paper, and writing is a relatively poor paper
