The printing methods are different, and the corresponding paper must be selected according to the requirements and characteristics of the use and printing process.
To print an item, you must first clarify what paper is needed to display the effect of the item as best as possible. There are many Chinese printers. They have a professional printing team that can provide customers with a one-stop service from paper selection to printing completion, binding and transportation. The following is a detailed explanation of several classifications of book printing paper by Chinese printer, I hope it will be helpful to you.
Toppan paper is the main paper used when printing books and magazines. It is suitable for the main text of important works, scientific and technological books, academic journals and textbooks of colleges and universities. Letterpress paper can be divided into four levels: No. 1, No. 2, No. 3, and No. 4 according to the different distribution ratios of paper materials. The number of paper represents the quality of the paper. The larger the number, the worse the paper quality.
Letterpress printing paper is mainly used for letterpress printing. The properties of this paper are similar to newsprint, but not exactly the same. The fibrous structure of relief paper is relatively uniform, and the gaps between the fibers are filled with a certain amount of fillers and sizing materials, and have been bleached, which forms the paper has a better adaptability to printing. Although its ink absorption is not as good as newsprint, it has the characteristics of uniform ink absorption; water resistance and paper whiteness are better than newsprint.
Newsprint is also called white newspaper, which is the main paper used in newspapers and books. It is suitable for text papers such as newspapers, periodicals, textbooks, comic strips, etc. The characteristics of newsprint are as follows: the paper is loose and light, has good elasticity, and has good ink absorption performance, which ensures that the ink can be better fixed on the paper. After the paper is calendered, both sides are smooth and lint-free, so that the print on both sides is clear and full; it has a certain mechanical strength; it has good opacity; it is suitable for high-speed rotary printing.
This paper is produced with mechanical wood pulp (or other chemical pulp) as raw materials, and contains a large amount of lignin and other impurities, so it is not suitable for long-term storage. If the storage time is too long, the paper will turn yellow and become brittle, have poor water resistance, and is not suitable for writing. The printing ink or book ink must be used, and the viscosity of the ink should not be too high. The moisture content of the plate must be strictly controlled during lithographic printing.
Offset paper is mainly used when printing higher-level color prints on offset (offset) printing machines or other printing machines, such as color pictorials, picture albums, posters, color printing trademarks, and some advanced book covers, illustrations, etc.
Offset paper is divided into special grade, No. 1, No. 2 and No. 3 according to the ratio of paper pulp. There are single-sided and double-sided, and there are two grades of super calender and ordinary calender.
Offset paper has small elasticity, uniform ink absorption, good smoothness, tight and opaque texture, good whiteness, and strong water resistance. Conjunctival offset printing inks and better quality lead printing inks should be used. The viscosity of the ink should not be too high, otherwise the phenomenon of powder removal and fuzzing will occur. Also to prevent dirt on the back side, generally use anti-dirt agent, dusting or interleaving paper.
Coated paper, also known as coated paper, is made by coating a layer of white slurry on the base paper and calendering it. The paper surface is smooth, the whiteness is high, the paper fiber distribution is uniform, the thickness is uniform, the flexibility is small, there is good elasticity and the surface is smooth, the whiteness is high, the paper fiber distribution is uniform, the thickness is uniform, and the flexibility is It is small, has good elasticity and strong water resistance and tensile properties, and has very good ink absorption and receiving state. Coated paper is mainly used for printing picture albums, covers, postcards, exquisite product samples and color trademarks. The pressure should not be too high when printing on coated paper, and offset printing resin ink and bright ink should be used. To prevent dirt on the back side, add anti-dirty agent, spray powder and other methods. There are two types of coated paper, single-sided and double-sided.
The texture of the painted newspaper is fine white and smooth, and it is used to print pictorial newspapers, atlases and posters, etc.
Written paper, also called book cover paper, is the paper used for printing book covers. Written paper is made of paper with pigments, in gray, blue, beige and other colors.
Embossed paper is specially produced and a kind of cover decoration paper. The surface of the paper has a pattern that is not very obvious. The colors are divided into gray, green, beige and pink, and are generally used to print monochrome covers. The embossed paper is kneeling, and the spine of the book is easy to break when binding. When printing, the paper has a large curvature and it is difficult to feed the paper, which affects the printing efficiency.
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