1, letterpress paper
Letterpress paper is the main paper for letterpress printing books and magazines. It is suitable for the text paper of important works, scientific books, academic journals and college teaching materials. Embossed paper can be divided into four grades according to the composition ratio of paper materials: 1, 2, 3 and 4. The quantity of paper represents the quality of paper. The greater the quantity, the worse the quality of paper.
2. Newsprint?
Newsprint, also known as white newspaper, is the main paper of newspapers and books. Suitable for newspapers, periodicals, textbooks, comics and other text papers. Newsprint is characterized by: the paper is light and elastic; Good ink absorption ensures that the ink can be better fixed on the paper.
After calendering, both sides of the paper are smooth and lint-free, so that the printed matter on both sides is clear and full; Have certain mechanical strength; Good opacity; Suitable for high-speed rotary printing.
3. Offset paper
Offset paper has small flexibility, uniform ink absorption, good smoothness, compact and opaque texture, good whiteness and strong water resistance. Conjunctival offset printing ink and good quality lead ink should be selected. The viscosity of ink should not be too high, otherwise there will be powder removal and galling. Also to prevent the back from getting dirty, generally use antifouling agent, dusting or lining paper.
4. Coated paper
Coated paper is also called printed coated paper. The surface of the base paper is coated with a layer of white paint, and the base paper is made of super calendering. It is divided into single-sided paper and double-sided paper, and the paper surface is divided into light splitting and cloth grain. The paper has smooth surface, high whiteness, good ink absorption and ink adhesion. Mainly used for offset printing and gravure printing of fine screen printing products such as advanced picture books, calendars, books and periodicals. The disadvantage is that the powder is easy to stick and fall off after being wet, so it can't be stored for a long time.
5. Written paper
Writing paper is paper used to print book covers. Writing paper is made of pigments such as gray, blue and beige. Specification of plain paper: 690× 960mm, 787×l092.