What are the characteristics of paper?

Characteristics and uses of printing paper

Reward points: 0 - Solution time: 2008-3-14 11:38

Asker: 5015642 - Level 2 There are different printing methods for the best answers, and the corresponding paper must be selected according to the requirements and characteristics of the use and printing process. The following is an introduction to some commonly used paper specifications in publishing, for your reference:

1. Letterpress paper

Toppan paper is the main paper used when printing books and magazines. It is suitable for text paper of important works, scientific and technological books, academic journals, college and technical secondary school textbooks, etc. Letterpress paper can be divided into four grades: No. 1, No. 2, No. 3 and No. 4 according to the different composition ratios of paper materials. The number of the 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. This paper has properties similar to, but not identical to, newsprint. The fiber structure of letterpress paper is relatively uniform, and the gaps between the fibers are filled with a certain amount of fillers and gums, and have also been bleached, which makes this paper better adaptable to printing. Although its ink absorption is not as good as newsprint, it has the characteristics of uniform ink absorption; its water resistance and paper whiteness are better than newsprint.

Letterpress paper has characteristics such as uniform texture, lint-free, slightly elastic, opaque, slightly water-resistant, and certain mechanical strength.

Weight: (49-60) ±2g/m2

Flat paper specifications: 787×1092, 850×1168, 880×1230; there are also some special sizes of paper

Roll paper specifications: width 787, 1092, 1575

Length about 6000m-8000m

2. Newsprint

Newsprint is also called white Newspaper is the main paper used for newspapers, periodicals and books. Suitable for text paper such as newspapers, periodicals, textbooks, comic books, etc. The characteristics of newsprint are: the paper is light and has good elasticity; it has good ink absorption performance, which 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 imprints on both sides are clearer and fuller; it has a certain mechanical strength; it has good opacity; it is suitable for high-speed web printing.

This kind of paper is produced from mechanical wood pulp (or other chemical pulp) and contains a large amount of lignin and other impurities, so it is not suitable for long-term storage. If stored for too long, the paper will turn yellow and become brittle, with poor water resistance, making it unsuitable for writing. Newspaper ink or book ink must be used. The viscosity of the ink should not be too high. The moisture content of the page must be strictly controlled during offset printing.

Weight: (49-52) ±2g/m2

Flat paper specifications: 787×1092, 850×1168, 880×1230

Roll paper Specifications: width 787, 1092, 1575; length about 6000m-8000m

3. Offset paper

Offset paper is mainly used for offset (offset) printing machines or other printing machines to print higher-end colors Used for printed matter, such as color pictorials, albums, posters, color printed trademarks and some high-end book covers, illustrations, etc.

Offset paper is divided into special size, No. 1, No. 2, and No. 3 according to the pulp ratio. It is divided into single-sided and double-sided, and there are two grades: super calendering and ordinary calendering.

Offset paper has small elasticity, uniform ink absorption, good smoothness, tight and opaque texture, good whiteness, and strong water resistance. Conjunctival offset printing ink and better quality lead printing ink should be used. . The viscosity of the ink should not be too high, otherwise powder removal and fuzzing will occur. To prevent dirt from sticking to the back, anti-fouling agents, powder spraying or lining paper are generally used.

Weight: 50, 60, 70, 80, 90, 100, 120, 150, 180 (g/m2)

Flat paper specifications: 787×1092, 850×1168, 880×1230

Roll paper specifications: width 787, 1092, 850

4. Coated paper

Coated paper is also called coated paper. This kind of paper It is made by coating a layer of white slurry on the base paper and calendering it. The surface of the paper is smooth, the whiteness is high, the paper fibers are evenly distributed, the thickness is consistent, and the elasticity is small. It has good elasticity and strong surface smoothness, the whiteness is high, the paper fibers are evenly distributed, the thickness is consistent, and the elasticity is small. It is small, has good elasticity, strong water resistance and tensile properties, and has very good absorption and reception of ink. Coated paper is mainly used for printing albums, covers, postcards, exquisite product samples and color trademarks. The pressure should not be too high when printing on coated paper, and offset resin-based inks and glossy inks should be used. To prevent stains from sticking to the back, methods such as adding anti-stain agents and powder spraying can be used. There are two types of coated paper: single-sided and double-sided.

Weight: 70, 80, 100, 105, 115, 120, 128, 150, 157, 180, 200, 210, 240, 250 (g/m2)

Among them: There are many imported paper specifications of 105, 115, 128, 157 (g/m2)

Flat paper specifications: 648×853, 787×970, 787×1092 (currently there is no roll paper in China). 889×1194 is the specification of imported coated paper

5. Pictorial newspaper

The texture of pictorial newspaper is fine, white and smooth, and is used for printing pictorials, albums and posters.

Weight: 65, 90, 120 (g/m2)

Flat paper specifications: 690×960, 787×1092

6. Written paper

Writing paper, also called book cover paper, is the paper used to print book covers. Pigments are added during the papermaking process, and come in gray, blue, beige and other colors.

Weight: 80, 100, 120 (g/m2)

Flat paper specifications: 690×690, 787×1092

7. Embossed paper

Embossed paper is specially produced and used as a cover decoration paper. The surface of the paper has a pattern that is not very obvious. The colors are gray, green, beige and pink, and are generally used to print single-color covers. The embossed paper is soft and the spine is easy to break when binding. When printing, the paper has a large curvature, which makes paper feeding difficult and affects printing efficiency.

Weight: 120-40g/m2

Flat paper specifications: 787×1092

Another classification method:

Super double Coated paper

The paper surface has higher gloss and better smoothness than ordinary coated paper. The paper surface is white and delicate, the printing color is bright, and the gradation and contrast are excellent. It is suitable for high-end color printing. Suitable for high-end books, catalogs, calendars, posters, and covers.

Snow-coated paper

Double-sided special powder processing, the paper is soft and elegant, with a matte effect, visually refreshing and comfortable, non-reflective, high opacity, and printing color saturation It has good brightness and excellent texture. Suitable for antique paintings, albums, calendars, magazines, books, special issues, catalogs, posters, etc.

Double-sided coated paper

The paper is smooth and white on both sides, with good gloss and high opacity. After color printing, the pattern effect is bright and the color gradation is good, suitable for color printing . Suitable for general books, catalogs, calendars, posters, covers, etc.

Single-sided coated paper

One side is coated and the other side is glued. Therefore, one side of the paper is bright, smooth and evenly absorbs ink. It is suitable for single-sided color printing and can be printed on the back. Gluing and other processing. Suitable for labels, posters, and release paper.

Special grade ivory Dowling

The paper color is ivory with soft and soft effect, non-reflective and non-glaring, with high opacity and smooth paper surface, suitable for reading books.

Journal paper

The paper is soft in color, smooth and delicate, non-reflective and non-glaring, suitable for high-end books and picture albums.

Bai Daolin

The paper is white in color, has good thickness, is produced with neutral glue, and can be stored for hundreds of years without discoloration. Suitable for books, notebooks, product manuals, letters, note papers, calendars, etc.

All wood Dowling paper

The slurry is mainly made of long fibers. The paper has strong tear resistance, excellent stiffness and high smoothness. It is the best grade of Dowling paper. Use paper. Suitable for magazine inserts (transfer slips), books, product brochures, postcards, envelopes, and desk calendars.

Magazine paper (high white magazine)

The paper is light and thin, has a glossy surface, and the paper color is high white. Therefore, the printing effect is better than the general yellowish paper color. Outstanding printing contrast and vivid colors, it is the best thin-pound high-grade paper in China. Suitable for magazines, DMs, books, weekly magazines, color instructions, and mail-order color promotional materials.

Snow-white Daolin paper

The paper is coated with a small amount, the color is as white as snow, the paper is smooth and delicate, non-reflective and non-glaring, suitable for high-end books and picture albums.

Special grade special white Dowling

The paper has high whiteness, smooth and delicate paper, and sharp contrast in printed products.