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What is the name, specification and purpose of the paper material of the commonly used packaging?

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1. Relief paper
relief paper is the main paper for relief printing books and magazines. Letterpress paper can be divided into four grades: No. 1, No. 2, No. 3 and No. 4 according to the different composition of paper materials. The number of paper represents the quality of paper. The larger the number, the worse the paper. Relief printing paper is mainly used for relief printing machines. The characteristics of this paper are similar to those of newsprint, but not exactly the same. Because the ratio of pulp and the beating of pulp are better than newsprint, the fiber structure of letterpress paper is relatively uniform, and the gap between fibers is filled with a certain amount of filler and glue, and bleached, which forms the adaptability of this paper to printing. Slightly different from newsprint, its ink absorption is not as good as newsprint, but it has the characteristics of uniform ink absorption; The water resistance and whiteness of paper are better than newsprint. Letterpress paper has the characteristics of uniform texture, no fuzzing, slight elasticity, opacity, slight water resistance and certain mechanical strength
weight: 49 ~ 60) ± 2G /m2
specification of flat paper: 787 × L092 mm, 850 × Ll68mm, 880xl230mm; And some special size paper
specifications of web paper: width 787mm, 1092mm, 1575mm, length about 60m ~ 80oo M
2. Newsprint
newsprint, also known as white newspaper, is the main paper for newspapers and books. News paper: soft and elastic; Good ink absorption performance, which ensures that the ink is fixed on the paper quickly; After calendering, both sides of the paper are smooth and lint free, so that the prints on both sides are clear and full; Have certain mechanical strength; Good opacity; Suitable for high-speed rotary printing. This paper is produced from mechanical wood pulp (or other chemical pulp) and contains a lot of lignin and other impurities. Not suitable for long-term storage. If the storage time is too long, the paper will turn yellow and brittle, the water resistance is poor, and it is not suitable for writing. Newspaper printing ink or book printing ink must be used. The ink viscosity should not be too high. The moisture of the layout must be strictly controlled during lithography
weight: 49 ~ 52) ± 2G /m2
flat paper specification: 787 × 1092 mm, 850x ll68 mm, 880 x l230 mm
Web size: 787mm, 1092mm and 1575mm wide; The length is about 6000 ~ 8000 meters

3. Offset paper offset paper is mainly used for lithographic (offset) printing machines or other printing machines to print higher-grade color printing materials, such as color pictorial, picture album, posters, color printing trademarks and some high-grade books, as well as book covers, illustrations, etc. Offset paper is divided into special size, No. 1 and No. 2 according to the proportion of paper slurry. There are single-sided and double-sided, super calendering and ordinary calendering
offset paper has small flexibility, uniform absorption of ink, good smoothness, compact texture, opaque, good whiteness and strong water resistance. Conjunctival offset printing ink and lead printing ink with good quality shall be selected. The viscosity of the ink should not be too high, otherwise there will be de dusting and roughening. Also prevent the back from sticking dirty. Generally, anti dirty agent, powder spraying or lining paper are used
weight: 50, 60, 70, 80, 90100120150180g /m2
flat paper specification: 787 × L092 mm; eight hundred and fifty × 1168 mm
Web size: 787mm, 1092mm, 850mm

4. Coated paper
coated paper is also known as printing coating paper. This paper is coated with a layer of white slurry on the base paper and pressed. Made of light The surface of the paper is smooth, the whiteness is high, the paper fiber is evenly distributed, the thickness is consistent, the elasticity is small, the elasticity is good, the water resistance and tensile properties are strong, and the absorption and receiving state of the ink are very good. Coated paper is mainly used for printing picture albums, covers, postcards, exquisite product samples and color trademarks. When printing on coated paper, the pressure should not be too large. Offset resin ink and bright ink should be selected. To prevent the back from sticking dirty, add anti dirty agent, powder spraying and other methods can be used
weight: 70, 80100120150180200210.240250g/m2
flat paper specification: 648 × 953 mm, 787 × 970 mm, 787 × 1092mm

5. Pictorial paper. The texture of pictorial paper is thin, white and smooth. It is used for printing pictorial, picture books and posters
weight: 65?? 91 and 12 g /m2
flat paper specification: 787 × L092 mm


6. Writing paper, also known as book cover paper, is the paper used to print the cover of books. When making paper, book paper is added with pigments, which are gray, blue, beige and other colors
weight: 120g /m2
flat paper specification: 690 × 960mm, 787 × L092 mm

7. Embossed paper embossed paper is a kind of decorative paper specially produced. The surface of the paper has a pattern that is not very obvious. The color is divided into gray, green, beige and pink. It is generally used to print monochrome cover. Embossed paper is brittle and the spine is easy to break when binding. When printing, the paper bending is large, and it is difficult to feed paper, which affects the printing efficiency
weight: 150 ~ 180 g /m2
flat paper specification: 787 × L092 mm, 850 × Ll68 mm

8. Dictionary paper dictionary paper is a kind of high-grade thin paper for books and periodicals. The paper is thin, strong and folding resistant. The paper surface is white and fine, the texture is tight and smooth, slightly transparent, and has certain water resistance. It is mainly used for printing dictionaries, classic books and other books with more pages and easy to carry. Dictionary paper has high requirements for the pressure and ink color in the printing process, so special attention must be paid to the art when printing
weight: 30 ~ 40g /m2
flat paper specification: 787 × L092 mm

9. The paper is thin and soft, light yellow and hairless. Water resistance and good ink absorption. Woolen edged paper should only be printed on one side, mainly for ancient books

10. Writing paper writing paper is the paper for ink writing. The paper is required not to swim when writing. Writing paper is mainly used to print exercise books, diaries, forms and account books. Writing paper is divided into special size, No. 1, No. 2, No. 3 and No. 4
weight: 45, 50, 60, 70, 80 g /m2
flat paper specification: 427 × 569 mm, 596 × 834 mm, 635 × Lll8 mm, 834 × Ll72mm, 787 × L092 mm
Web size: 787mm, 1092mm

11. Typing paper typing paper is a thin sheet of paper. The paper is thin and flexible. It is required not to punch holes when typing and will not be scratched by the nib when copying with a hard pencil. It is mainly used for printing documents, forms and multiple duplicate vouchers. It is used as interleaving paper and printing and packaging paper in books. Typing paper has white, yellow, red, blue, green and other colors
weight: 20 ~ 25g /m2
flat paper specification: 787 × L092 mm, 560 × 870 mm, 686 × 864 mm, 559 × 864 mm

12. Postal paper postal paper is used for printing all kinds of carbon copies and printing and packaging paper in printing
weight: 25 ~ 28g /m2
flat paper specification: 787 × L092 mm

13. Cowpea paper cowpea paper is thin and tough, which is suitable for printing multi copy copy books; It is used to protect art works and play an aesthetic role in book binding
weight: 17 ~ 20g /m2
flat paper specification: 787 × L092 mm

14。 Self printing paper white printing paper has small flexibility, toughness and is not easy to break when folded. It is mainly used for printing packaging boxes and commodity packaging paper. In book binding, medium diameter paper (ridge strip) or cover of
spine and hardcover books for wireless binding. There are super grade and ordinary, single-sided and double-sided. According to the bottom layer, there are two kinds of gray background and white background
weight: 220240.250280300350400g/m2
flat paper specification: 787 × 787 mm, 787 × 1092 mm, 1092 × 1092 mm

15. Kraft paper kraft paper has high tensile force, including single light, double light, stripe, no grain, etc. It is mainly used for wrapping paper, envelopes, paper bags and printing machine drum lining.

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