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Synthetic paper is made from chemical raw materials such as olefins and some additives. It has soft texture, strong tensile strength, high water resistance, light resistance, cold and heat resistance, resistance to chemical corrosion, no environmental pollution, good air permeability, and is widely used in the printing of high-end artworks, maps, picture albums, high-end books and magazines, etc. 　　Synthetic polymer materials (such as polyethylene, polypropylene, etc.) are made into semi-finished paper sheets by film drawing (pressing or blowing), and then paperized by chemical or physical methods, such as sanding to increase opacity, and using chemicals to treat the surface to obtain liquid repellency. Another type of synthetic paper product can use synthetic pulp, which is made after pulping. Synthetic paper [1] has extremely high tensile strength, extremely high tear strength, good insulation properties, optical properties and excellent wet strength. It is used as insulation material, nautical paper, military map paper, etc. 　　It is also called chemical film paper, polymer paper, plastic paper, etc. [2] Its main raw materials are organic resins such as polyethylene, polypropylene, and polystyrene. The manufacturing method is to first melt, extrude, and form a film of the above resin, and then stretch it along different axes to form a film; then, the film is "paper-like" treated to make it opaque and improve its whiteness, so that synthetic paper is made. This kind of paper has high tensile strength, is not afraid of water, is not moth-eaten, is elastic, can insulate, has stable dimensions, and has a smooth surface, making it suitable for books and printing. It is mostly used to make fishery paper, nautical charts, perforated cards, water-resistant newspapers and magazines, record covers, product labels, outdoor advertising, business cards, etc. Its disadvantage is that it has poor folding resistance and has creases that are not easy to disappear after folding. It is difficult to recycle waste synthetic paper.