1. Kraft paper: used as packaging material. High strength. It is usually yellowish brown. Semi-bleached or fully bleached kraft pulp is light brown, cream or white. Quantitative 80 ~ 120g/m2. The fracture length is generally over 6000 meters. High tear strength, breaking work and dynamic strength. Most of them are roll papers, but there are also flat papers. Kraft softwood pulp was used as raw material to make pulp and paper in fourdrinier machine. It can be used as cement bag paper, envelope paper, adhesive paper, asphalt paper, cable protection paper, insulating paper, etc.
Cellophane: a film made of natural fibers such as cotton pulp and wood pulp by gluing. It is transparent, non-toxic and tasteless. Because air, oil, bacteria and water do not easily penetrate cellophane, it can be used as food packaging.
Newsprint: also known as white newspaper, it is the main paper for newspapers and books. Suitable for newspapers, periodicals, textbooks, comics and other text papers. Newsprint is characterized by: the paper is light and elastic; Good ink absorption 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 printed matter on both sides is clear and full; Have certain mechanical strength; Good opacity; Suitable for high-speed rotary printing.
4. Sulfuric acid paper: also known as plate-making transfer paper sulfate, it is mainly used in printing and plate-making industries, and has the characteristics of pure paper, high strength, good transparency, no deformation, sun resistance, high temperature resistance and aging resistance. Widely used in manual drawing, pen/inkjet CAD plotter, engineering electrostatic copying, laser printing, art printing, document recording and so on. There are 63gA4, 63gA3, 73gA4, 73gA3, 83gA4, 83gA3, 90gA4, 90gA3 and other specifications.
5. Coated paper: printed coated paper. The surface of the base paper is coated with a layer of white paint, and the base paper is made of super calendering. It is divided into single-sided paper and double-sided paper, and the paper surface is divided into light splitting and cloth grain. The paper has smooth surface, high whiteness, good ink absorption and ink adhesion. It is mainly used for offset printing and gravure printing of fine screen printing, such as illustrations in advanced picture books, calendars and books. The disadvantage is that the powder is easy to stick and fall off after being wet, so it can't be stored for a long time.