Paper classification introduction
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Paper is widely used, including industrial paper, packaging paper, household paper, and cultural paper. In the cultural paper, there are writing paper, art painting paper and printing paper. Printing paper is generally divided into five types: newsprint, letterpress paper, offset paper, coated paper and specialty paper.
Newsprint. Also known as the white newspaper. The texture is soft, the ink absorption is strong, and the tensile strength is certain, but the water resistance is poor, and it is easy to yellow and become brittle. Mainly print newspapers and periodicals.
Letter paper. It is a special paper for letterpress printing. Uniform texture, white color, slightly water resistant, not easy to yellow and brittle. Mainly printing books and magazines.
Offset paper. It is a higher grade printing paper. The texture is tight, the paper surface is smooth, the opacity and whiteness are high, and the water resistance is strong, which is suitable for lithography. Mainly print books and covers, magazine inserts, pictorials, trademarks and cellars.
Coated paper. Also known as coated paper, it is a high-grade printing paper that is coated with a layer of white paint on the surface of the base paper and then calendered or supercalendered (the base paper is non-coated paper such as offset paper or letterpress paper). High surface smoothness, white color and strong water resistance. Suitable for printing higher-level albums, book inserts, calendars, greeting cards, etc. In recent years, Yuanguang coated paper has been widely used in printing. Matte coated paper refers to coated paper with low gloss and smooth surface. The albums and magazines printed with it often give people an elegant feeling. Long-term reading, without the stimulation of high light, the eyes will not feel tired, the most suitable Printing prints with ornamental value.
Special paper. Refers to paper that has certain special features and is suitable for special use. Some of them are made by processing a chemical agent into a slurry, and some are made by secondary processing of a base paper.
The appearance of special papers is significantly different from the appearance of commonly used coated papers and offset papers. Most papers have stripes or patterns on the surface, some have high paper smoothness, some have excellent transparency, and some have a paper surface. The change in color. Usually used to print business cards, invitations, beautiful greeting cards, restaurants, hotel menus, etc. Its prints are characterized by strong, luxurious and sophisticated products.
In recent years, with the rapid development of the chemical industry, the amount of synthetic paper used in printing has been increasing. Synthetic paper is a paper made from a synthetic polymer material as a main raw material, which imparts printing properties to paper by processing, and is used for printing. It has the characteristics of light weight, folding resistance, wear resistance and moisture resistance. The manufacture of synthetic paper, which does not require natural fibers and is environmentally friendly, is a printing paper with a promising future.