The development of paper has also undergone a tortuous process. After inventing paper in 105 AD, papermaking was spread from Henan to other regions where the economy and culture developed. Cai Lun was sealed to Longting Hou in Yang County, Shaanxi Province. Papermaking was spread to the Hanzhong area and gradually spread to Sichuan. According to the folk legend of Caiyang in the hometown of Cai Lun, Cai Lun also taught papermaking to his hometown. At the end of the Eastern Han Dynasty, Shandong's papermaking industry was relatively developed. It left Zuo Bo, a papermaking expert in Donglai County (now Jing County). After papermaking was promoted throughout the country in the second century AD, paper became a powerful contender for harmony and simplicity. From the third to fourth centuries, paper has basically replaced Dai and Jane as the only writing materials in our country, which has effectively promoted the spread and development of China's scientific culture. During the Wei, Jin and Southern and Northern Dynasties from the third to the sixth centuries, papermaking in our country continued to innovate. In terms of raw materials, in addition to the original hemp and cockroaches, it has been extended to use mulberry and cane paper. In terms of equipment, the papermaking technology of the Western Han Dynasty has been inherited, and more curtains and curtains have been used. With an active bamboo screen placed on the frame, thousands of wet papers can be removed and the work efficiency improved. In the processing and manufacturing technology, the lye cooking and boiling are enhanced, the quality of the paper is improved, and colored paper, coated paper, filler paper, and other processed papers appear.

Printing common paper classification


1, letterpress printing paper: referred to as letterpress paper, product packaging in the form of reel and lithographic points. Relief paper is weighed from 50 grams to 80 grams per square meter. The article number is divided into special number, number one and number two. No.1 and No.1 letterpress paper are used for printing advanced books, and No.2 letterpress paper is mainly used for printing general books, textbooks, and periodicals.

2, newsprint: also known as white newspapers, packaging forms are also reel and lithographic points. The ration of newsprint is about 51 grams, which is mainly used for printing newspapers and periodicals.

3, offset printing paper: referred to as offset paper, quantitative 60-180 grams, with double-sided offset paper and single-sided offset paper. One of the 70-120 grams of double-sided offset paper is the most widely used. Double, single-sided offset paper product number has a special number, number one, two three. No.1 and No.1 double-sided offset paper are used for printing advanced color offset printing products; No. 2 double-sided offset printing paper is used for printing general color prints; single-sided offset paper is mainly used for printing posters and New Year pictures.

4, copper plate paper: copper plate paper coating a layer of coating liquid on the original paper, made by super calendering. Quantitative 90-250 grams, double-sided copper plate and single-sided coated paper. There are three types of product number: No.1, No.2 and No.2. Extra thickness coated paper is used to print 150 grams of exquisite products with Internet lines; No. 1 coated paper is used for printing products with 120-150 network cables; No. 2 coated paper can be used for products with 120-gram or less of network cables. Coated paper is not resistant to folding and it is extremely difficult to recover once creases appear.

5, book paper: quantitative 80-120 grams, mainly for books and magazines for cover use. The cover paper is available in a variety of colors to suit the needs of printing various covers.

6, dictionary paper: divided into two, two, quantitative 25-50 grams, mainly for printing dictionaries, manuals use. Dictionary paper is hygroscopic and wrinkles when slightly dampened.

7, copy paper: copy is a English transliteration, meaning that copy. Copy paper is mainly used for printing multiple orders, suitable for copying and typing. Because the copy paper is translucent, in the printing of books and books, the main text is used to protect the pages of the portrait page.

8. Board paper: paper with a basis weight of 250 g/m2 is called board paper or cardboard. There are many types of board paper, and board paper used in book printing is mainly used for making cover pressboards for hardcover bookcases and envelope pressboards for making hardcover books and book covers. The paperboard is lithographic paper. The thickness of the cover pressboard is generally divided into 1 (mm), 1.5 (mm) and 2 (mm). There are six types of envelope pressboards: 1 (millimeter), 1.2 (millimeter), 1.4 (millimeter), 2 (millimeter), 2.5 (millimeter), and 3 (millimeter). Cardboard is also used to make paper boxes.

Letterpress paper


Letterpress paper is the main paper used in the use of letterpress books and magazines. Applicable to important works, science and technology books, academic journals, textbooks for colleges and universities and other texts. Letterpress paper can be divided into four grades of No. 1, No. 2, No. 3, and No. 4 according to the distribution ratio of paper materials. The paper number represents the degree of paper quality. The larger the number, the worse the paper quality. Toppan printing paper is mainly used for relief printing. The properties of this paper are similar to those of newsprint, but they are not exactly the same. Because the proportion of pulp and the pulp solution are better than newsprint, the fibrous tissue of the letterpress paper is relatively uniform. At the same time, the voids between the fibers are filled with a certain amount of filler and rubber, and after bleaching, this results in the formation of This paper has a good adaptability to printing. Slightly different from newsprint, its ink absorption is not as good as newsprint, but it has the characteristics of uniform ink absorption; water resistance and paper whiteness are better than newsprint. Relief paper has a uniform texture, lint-free, slightly elastic, opaque, slightly water-resistant and has a certain degree of mechanical strength.

Weight: (49 ~ 60) ± 2g/m2

Flat paper specifications: 787 × 1092, 850 × 1168, 880 × 1230; there are some special size paper.

Web specifications: width 787,1092,1575; length about 6000 ~ 8000m

Newsprint


Newsprint, also known as white paper, is the main paper for newspapers and magazines; it is suitable for newspapers, periodicals, textbooks, and comic books. The characteristics of newsprint are: Paper is light and light, and it is full of good elasticity; The ink-absorbing performance is good, this ensures that the ink can be fixed on the paper surface more; After the paper is smoothed, both sides are smooth, no lint, so that both sides The print is relatively clear and full; it has a certain mechanical strength; opacity is good; suitable for high-speed web press printing.

This kind of paper is produced from mechanical pulp (or other chemical pulp) as a raw material, contains a lot of lignin and other magazines, and should not be stored for a long time. If the storage time is too long, the paper will become yellow and brittle, and the water resistance is poor, so writing is not appropriate. Must use printed ink or book ink, the ink viscosity should not be too high, the lithography must strictly control the layout of moisture.

Weight: (49 ~ 52) ± 2g/m2

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

Web Specifications: Width 787, 1092, 1575: Length 6,000 ~ 8000m

Offset paper

Offset paper is mainly used for lithographic (offset) printing presses or other printing machines for printing higher-level color prints, such as color pictorials, photo albums, posters, color printing logos, and some advanced book covers and illustrations.

Offset paper according to the score of the pulp material for the special number, No. 1 and No. 2 three, with a single-sided and two-sided points, there are two kinds of super calendering and ordinary calendering.

The offset paper has small stretchability, uniform ink absorption, good smoothness, close opaque texture, good whiteness, and strong water resistance. Conjunctival offset printing inks and good quality printing inks should be used. The viscosity of the ink should not be too high, otherwise there will be powdering, pulling phenomenon. Also to prevent dirt on the back, generally using anti-dirty agent, dusting or insert liner.

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

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

Web Specifications: Width 787, 1092, 850:

Coated paper

Coated paper, also known as coated paper, is coated with a white paste on a base paper and is calendered. The surface of the paper is smooth, the whiteness is high, the paper fiber is distributed evenly, the thickness is the same, the stretchability is small, there is better elasticity and strong water resistance and tensile performance, and the ink absorption and reception state is very good. Coated paper is mainly used to print pictures, covers, postcards, exquisite product samples, and color trademarks. Coated paper printing pressure should not be too large, to use offset printing ink and light ink. To prevent the back of the dirty, you can use anti-dirty agent, dusting and other methods. Coated paper has two types of single and double sided.

Weight: 70,80,100,105,115,120,128,150,157,180,200,210,240,250 (g/m2) Of which: 105,115,128,157 (g/m2) imported paper More specifications

Flat paper specifications: 648×953, 787×970, 787×1092 (currently there is no web in China). 889 × 1194 imported copper paper specifications.

Other paper

Painting newspaper

The texture of the painting is fine and smooth, and it is used for printing pictorials, atlases, and posters.

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

Tablet size: 787×1092

Written paper

Written paper, also known as book paper, is the paper used for printing book covers. Written paper is pigmented in paper, with gray, blue, beige and other colors.

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

Tablet size: 690×960,787×1092

Embossed paper

Pressure paper is a type of cover decorative paper specially produced. The surface of the paper has a pattern that is not very noticeable. The color is gray, green, beige and pink, and is generally used to print monochrome covers. Embossed paper is brittle and the spine breaks easily when binding. The curvature of the paper during printing is large, and it is difficult to feed the paper, which affects the printing efficiency.

Weight: 120~40 g/m2

Tablet size: 787×1092

Dictionary paper

Dictionary paper is a kind of advanced thin-type publication paper. It is thin, strong and durable, with fine white paper, tight and smooth texture, slightly transparent, and a certain degree of water resistance. It is mainly used for printing dictionaries, dictionaries, manuals, classic books, and books with more page numbers and portability. Dictionary paper has high requirements on the pressure and ink in the printing process, so the printing process must pay special attention to it.

Weight: 25 ~ 40g/m2

Tablet size: 787×1092

Burr paper

The burr paper is thin and soft, pale yellow, has no water resistance, and has good ink absorption. The raw paper should only be printed on one side, mainly for ancient books.

Writing paper

Writing paper is a paper for writing ink, and paper is required to be written. Writing paper is mainly used to print exercise books, diaries, forms and books. Writing paper is divided into No. 1, No. 2, No. 3 and No. 4.

Weight: 45,50,60,70,80 (g/m2)

Flat paper specifications: 427×569,596×834,635×1118,834×1172,787×1092

Web specifications: 787,1092

Typing paper

Typing paper is thin-sheet type paper, thin and flexible, and requires no holes when typing, and will not be scratched by a pen tip when rewritten with a hard pen. Mainly used for printing documents, forms, and multi-copy certificates. Used as a slip sheet and printing and packaging paper in books. Typing paper has white, yellow, red, blue, green and other colors.

Weight: 24 ~ 30 g/m2

Flat paper specifications: 787×1092,560×870,686×864,559×864

Postage paper

Postage paper is used to print all kinds of copybooks and printing and packaging papers in printing.

Weight: 25 to 28 (g/m2)

Tablet size: 787×1092

Copy paper

Copy paper is thin and flexible, suitable for printing multiple copies of the book; used in book binding for the protection of art works and play an aesthetic role.

Weight: 17 to 20 (g/m2)

Tablet size: 787×1092

White paper

White paper is small in stretchability and toughness, and it is not easy to break when folded. It is mainly used for printing packaging boxes and decorative paper for goods. In bookbinding, binding materials such as paper (ridges) in both sealed and hardcover books for hardbound books.

There are two types of white paper, paper white and plain white. According to the bottom of the classification of gray and white two.

Weight 220,240,250,280,300,350,400 (g/m2)

Flat paper specifications: 787 × 787, 787 × 1092, 1092 × 1092

Kraft paper

Kraft paper has high tensile force, such as single light, double light, stripes, and no grain. Mainly used for packaging paper, envelopes, paper bags, etc.

Flat paper specifications: 787 × 1092, 850 × 1168, 787 × 1190, 857 × 1120 (China Packaging Network integration)

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