1. Types:

There are many kinds of paper, which are divided into 17 types (11 types of paper and 6 types of cardboard) by the Ministry of Light Industry of China? Eleven types of paper are-printing paper, writing paper, drawing, drawing paper, electrical insulation paper, cigarette paper, blotting paper, computer paper, photosensitive paper, transfer paper (base paper), industrial technology paper and wrapping paper. ? There are six types of cardboard-binding cardboard, box-making cardboard, insulating cardboard, industrial technology cardboard, building cardboard and shoemaking cardboard.

2. uses:

1. printing paper-among the printing papers, there are papers with different properties and characteristics, such as newsprint, letterpress printing paper, offset printing paper, offset printing coating paper, bible paper, map paper, sea drawings, gravure printing paper, weekly newspaper, pictorial newspaper, whiteboard paper, written paper and so on.

2. Newsprint-mainly used for printing newspapers and letterpress books and periodicals. Its paper is soft, elastic and plastic, and has strong ink absorption performance. The ink can be fixed on the paper quickly, and the paper is pressed successively by a calender. The two sides are smooth and not easy to fluff. The printing on both sides is clear and solid, with certain mechanical strength, and it is suitable for high-speed rotary printing with good opacity. Because the raw materials used are mainly mechanical wood pulp, which contains essential elements and impurities, the paper is not suitable for long-term storage, and it is easy to become yellow and brittle, with strong absorption and poor water resistance, and it is easy to be damaged.

3. relief printing paper-mainly used for printing anthologies, classic works, general books, textbooks, magazines, etc. by relief printing machine. Its characteristics are similar to newsprint, its quality is better than newsprint, its smoothness, water resistance and whiteness are better than newsprint, its ink absorption ability is not as good as newsprint, but its ink absorption is even.

4. Offset printing paper-mainly used for lithographic printing of color pictorial, picture album, poster, color trademark and some advanced publications.

5. Offset paper can be divided into single-sided offset paper and double-sided offset paper, and single-sided bite paper is often used in color posters, cigarette cases, trademarks, etc. Double-sided adhesive paper is used for printing pictures, illustrations, maps, etc. ?

6. Offset paper should be small in elasticity and strong in water resistance, so as to prevent the paper from being deformed and overprinted incorrectly when multicolor overprinting occurs, and it should also be free of napping and powder removal, and the texture should be tight, so as to prevent the phenomenon of napping and powder removal caused by the adhesive tension of ink when printing for many times, so that the imprint has white spots, which will affect the quality of printed products; The ink absorption should not be too high, which can hinder the penetration of the binder in the ink, make the ink dry on the paper to form a film layer, and ensure the gloss of the printed matter; The surface is smooth, ensuring that the imprint is real, and the paper can't have sand and other sundries to prevent the blanket and printing plate from being damaged. ?

7. Offset printing coated paper-also known as coated paper. It is made by coating a layer of inorganic coating on the paper surface of the coating base paper, and then super calendering. The paper has a smooth surface and high whiteness, and is specially used for offset printing monochrome or multicolor art pictures, illustrations, pictorial, picture books, commodity trademarks, product samples, calendars, etc.

The earliest paper existed 2,2 years ago in the early Western Han Dynasty, but it was still rough and not widely used. In 15 AD, Cai Lun in the Eastern Han Dynasty was regarded as the originator of modern papermaking after improvement. ("Cyperus papyrifera" is not the "paper" in the present concept, but a writing medium made by treating the plant Cyperus papyrifera to some extent. The papermaking invented by China broke the original arrangement of plant fibers and made them cross randomly again, so that the finished product can be called "paper". )

Chinese characters were invented in the Yin and Shang Dynasties, and Oracle bones were used as writing materials. In the Spring and Autumn Period, bamboo chips, wood chips and silk were discovered and used as writing materials. However, because silk is too expensive and bamboo pieces are too heavy, paper is produced. One of four great inventions of ancient china? [1]? Papermaking, together with compass, gunpowder and printing, provided the material and technical basis for the prosperity of ancient culture in China. The invention of paper ended the complicated history of ancient bamboo slips and greatly promoted the spread and development of culture.

The paper with maps of the Western Han Dynasty unearthed in Fangmatan, Tianshui, Gansu Province is the earliest pulp paper found in the world.

sheets made of plant fibers are used for writing pictures, printing books and newspapers, packaging, etc. Different from bamboo, bamboo is the "silk" of animal fiber. Paper: the general term for paper. Paper is counted by sheets, so paper is generally divided into: letterpress printing paper, newsprint, offset printing paper, coated paper, book cover paper, bible paper, copying paper, paperboard, etc.