The use and characteristics of paper

According to the purpose of paper, it can be divided into wrapping paper, printing paper, industrial paper, office paper, cultural paper, household paper and special paper.

1. printing paper-among printing paper, there are papers with different properties and characteristics, such as newsprint, letterpress printing paper, offset printing paper, bible paper, map paper, ocean map paper, gravure paper, weekly newspaper, pictorial paper, whiteboard paper, writing paper, etc.

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. Ink can be quickly fixed on paper. After the paper is pressed by the calender, both sides of the paper are smooth, not easy to fluff, and the printing on both sides is relatively clear and solid.

It has certain mechanical strength, can be suitable for high-speed rotary printing, and has good opacity. Because the raw materials used are mainly mechanical wood pulp, which contains essential elements and impurities for human body, the paper is not suitable for long-term storage, easy to turn yellow and brittle, with strong water absorption, poor water resistance and easy to be damaged.

3. Printing paper-mainly used for printing anthologies, classic works, general books, textbooks, magazines, etc. Through a 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, and its ink absorption ability is not as good as newsprint, but its ink absorption is uniform.

4. Offset printing paper-mainly used for lithographic 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 adhesive paper. Single-sided biting paper is often used in color posters, cigarette cases, trademarks and so on. Double-sided tape is used to print pictures, illustrations, maps, etc. ?

6, offset coated paper-also known as coated paper. It is made by coating a layer of inorganic coating on the paper coated with 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, trade marks, product samples, calendars, etc.

Extended data:

The raw materials for papermaking are mainly plant fibers. In addition to cellulose, hemicellulose and lignin, there are other components with less content, such as resin and ash. In addition, there are auxiliary ingredients such as sodium sulfate.

Besides plant fiber, different fillers need to be added according to different paper materials. For example, copper-based antibacterial paper is made by compounding copper ions on the first monomer acrylonitrile of polyacrylonitrile (commonly known as acrylic fiber) to make a modified acrylic composite fiber, and then adding the modified acrylic fiber to plant fibers to match with various papers to make antibacterial paper. ?

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