Offset paper: also known as Daolin paper, English is: wood-free printed paper. Offset paper is a type of ordinary paper that we use daily, such as copy paper, homework paper, etc. The commonly used ones are 60g/80g/100g, etc. Offset paper refers to printing paper, also called offset paper. It refers to paper that is coated with glue on both sides of the paper during the papermaking process to improve its surface physical properties. Generally, the basis weight of offset paper is between 60 grams and 120 grams, and there are also high-weight offset papers of 150 grams. Coated paper: Coated paper is also called coated printing paper, and is called pink paper in Hong Kong and other regions. This kind of paper is a coated and processed paper first developed by the British in the mid-19th century. High-grade printing paper is made by mixing white and fine porcelain clay into paint and evenly applying it on the surface of the base paper (coating one side or both sides). Because the process is like a woman applying powder to her face, it is called powder paper. As for the fact that it is called coated paper in mainland China, it is because when this kind of paper was used to print exquisite famous paintings in Europe, the printing plates used were etched copperplates. Therefore, according to the convention of naming by use, the art paper used for copperplate printing is called copperplate (printing) paper. Colleagues in the printing and paper industry in mainland China all refer to Art Paper as coated paper, not pink paper. It is a high-grade printing paper made of base paper coated with white paint. It is mainly used for printing covers and illustrations of high-end books and periodicals, color pictures, various exquisite product advertisements, samples, product packaging, trademarks, etc. Coated paper is flat paper with dimensions of 787×1092mm and 880×1230mm, and the basis weight is 70~250g/square meter. Coated paper can be divided into single-sided coated paper, double-sided coated paper, matte coated paper, and textured coated paper. According to quality, they are divided into three grades: A, B, and C. The main raw materials of coated paper are coated base paper and coating. The requirements for coated base paper are uniform thickness, small stretchability, high strength and good water resistance. The paper surface must not have spots, wrinkles, holes and other paper defects. The coating used for coating is composed of high-quality white pigments (such as kaolin, barium sulfate, etc.), adhesives (such as polyvinyl alcohol, casein, etc.) and auxiliary additives. of. This kind of paint with high fluidity and high solid content is applied thinly and evenly on the base paper through a coater, then dried, rolled into a roll on a paper winding machine, and then sent to a super calender for pressing. Light finishing, final cutting, paper selection, and packaging. Light paper: Light paper is light offset paper. It is a more humane paper type and a new star in paper products. It is of high quality, light weight, low price, does not contain fluorescent whitening agents, has high mechanical pulp content, is environmentally friendly and comfortable. . The original colors used can protect the eyes of readers, especially the elderly and children, so that their eyesight will not be damaged when reading. It is easy for readers to carry and read, and has natural characteristics. Lightweight paper has good texture and bulk, high opacity, good printing adaptability and original restoration after printing, good texture and is light and thick. Books printed with it are about four times lighter than books printed with ordinary paper. One to one third, which is convenient for readers and saves shipping and mail order costs. The transliteration of light paper is called Munkdkal in Sweden. The light paper produced by a local paper company was also named Munkdkal locally. When this kind of paper was first introduced to China, it had the name " Monken" name. Since it is the earliest lightweight offset paper introduced in my country, it is now customary in China to call this type of paper Mengken paper (lightweight paper), and people in the paper industry generally call it "Mengken" directly. In developed countries such as Europe, America and Japan, more than 95% of the books in bookstores are printed on this kind of paper. Lightweight coated paper: Coated paper is a layer of coating (coating color) applied to the base paper to make the paper have good optical properties and printing performance. Its main uses are: printing paper for publications such as magazines and books, and printing paper for trademarks, packaging, catalogs, etc. The ratio of the two is about 1:3. Coated paper can be divided into: coated paper, coated paper, lightweight coated paper. In addition, there are also special coated papers such as thermal coated paper.

There are also some differences in the classification of this type of coated paper in countries around the world. The base paper generally uses Dowling paper, and coated paper containing groundwood pulp or deinked pulp base paper is also used. Except for special purposes, it is mostly used for advertising posters and magazine inside pages. Therefore, even under the same reproduction conditions, the result will be different. The colors will also be very different. Therefore, in order to improve the printing quality, it is necessary to first understand the impact of the paper on the color reproduction, and then make appropriate adjustments on the photographic color separation or printing machine to make the printing quality meet the needs. Writing paper: It is a kind of cultural paper that is widely consumed. It is suitable for forms, exercise books, account books, record books, etc., and is used for writing. It is divided into five grades: special number, No. 1, No. 2, No. 3 and No. 4. , the basis weight is 45g/m2 to 80g/m2. Quality requirements: white color, smooth on both sides, tight texture, and no water smearing when writing. Weight: 45, 50, 60, 70, 80 g/m2. Flat paper specifications: 427×569 mm, 596×834 mm, 635×lll8 mm, 834×ll72 mm, 787×l092 mm. Web specifications: 787 mm, 1092 mm. White cardboard is a thick paper that is strong, thick, and has a large weight. In the past, some people planned to use the quantitative basis of white cardboard to divide it into: paper, cardboard and cardboard. In the early years, white thick paper with a quantitative value of about 200g/m2 (smooth surface, calendered, and high stiffness) was used in the Shanghai market. Also known as thin cardboard), also known as heavy paper. In fact, it is also a kind of jam. The most common cardboard is not colored and is commonly called white cardboard. If it is colored, it is called color cardboard according to its color. The main use of white cardboard is to print business cards, certificates, invitations, covers, monthly calendars and postal postcards, etc. Single copper paper has a bright surface, even coating, fast ink absorption and good printability, and is suitable for delicate color printing. For the purpose of fine printing, the surface of the base paper is coated with paint and calendered by a super calender. Double-coated paper is divided into single-sided and double-sided coated paper. According to the Japanese paper industry classification standard, the coating amount on each side is about 10g/m2 or more. It is currently most commonly used in cultural publishing, advertising design, printing and binding, and industrial and commercial circles. One of the paper types. Offset paper refers to printing paper, also called offset paper. Our books are printed on offset paper (but the paper used in Ruili and other fashion magazines has a smooth surface, and the coated and glossy paper is called double offset paper. Paper), generally between 60 grams and 120 grams, there are also high-weight double-adhesive papers of 150 grams. Anything less than 60 grams is not called double-adhesive paper but writing paper, and it is a relatively poor paper type for writing. Double-copper Paper: Copy paper: Currently, the levels of office paper can be divided into three levels. First-class paper is used for corporate external documents, second-class paper is used for large quantities of external copy documents, and third-class paper is generally used for internal use of enterprises and does not require too high text. Insights on general paper: It has AKD neutral sizing agent and is non-corrosive. The raw materials of first-class paper are all 100 pure wood pulp, which does not produce paper powder and has a soft hand feel. No matter how it is used, it will not wear out the parts and components of the copier. Print head. In terms of static electricity, the first-grade paper has also undergone electrostatic treatment, so there will be no phenomenon of multiple sheets of paper being fed. Computer printing paper paper specifications refer to the fact that after the paper is made, it is trimmed and trimmed to a certain size. In the past, the size of the paper was expressed by how many "opens" (such as 8 open or 16 open, etc.). Now I adopt international standards, which stipulate that A0, A1, A2, B1, B2, etc. are used to express the format specifications of the paper. The standard stipulates that the proportional relationship between the width of the paper (represented by X) and the length (represented by Y) is X:Y=1:n. According to the basic area of ??the paper format, the format specifications are divided into A series, B series and C series. The format size of A0 is 841mm×1189mm, the format area is 1 square meter; the format size of B0 is 1000mm×1414mm, the format The area is 2.5 square meters; the format size of C0 is 917mm×1279mm, and the format area is 2.25 square meters; the format specifications of copy paper only use A series and B series.

If A0 paper is cut into two equal lengths, it will become A1 size. If A1 paper is cut in half along the length direction, it will become A2 size. Then it will be cut into A8 size. B8 paper will also be cut into B8 size in the same way. Specification. The format sizes of A0~A8 and B0~B8 are listed in the table below. Among them, 7 format specifications, including A3, A4, A5, A6 and B4, B5 and B6, are commonly used specifications for copy paper. For example, "A4" paper is to fold the A-type basic size paper 4 times, so the area of ??an A4 paper is one-fourth of 2 to the power of 2 of the basic paper area, that is, 1/16. The rest can be deduced in this way. There is also a type of K-type paper, which is what we often call open-type paper. K-type paper is only available in China. Nowadays, A-type paper is generally used. Regardless of type A or type B, its classification is the same. For example, A5 is twice the size of A6, A4 is twice the size of A5, A3 is twice the size of A4, B4 is twice the size of B5, B3 is twice the size of B4, and K-type classification is to divide a large 1K paper into two pieces as 2K, divide the 2K paper into half as 4K, divide the 4K paper into half as 8K, divide 8K into half as 16K, and divide 16K into Half would be 32K etc. The format size specified by the state is an international standard series, which has been incorporated into the national industry standard GB/T 1999 and will be implemented nationwide. The current format sizes of books and periodicals are mainly A series specifications, which are as follows: A4 (16k) 297mm × 210mm; A5 (32k) 210mm × 148mm; A6 (64k) 144mm × 105mm; A3 (8k) 420mm × 297mm; Note : Among them, A3 (8k) size has not been determined yet, but it is commonly used.