Printing paper specifically refers to paper for printing, including paper and cardboard. The definition of paper and board can be expressed as: "a thin layer of material with a certain strength and printability, based on the processed plant fibers as the main component, fibers intertwined with each other and hydrogen bonds." The paper is generally single-layered, with a weight of 30 to 250 grams per square meter; the cardboard is multi-layered and has a thickness of more than 0.5 mm. More than 250 grams per square meter. The quality and performance of printed paper for different applications vary widely. The narrow sense of printing paper specifically refers to newsprint, relief paper, offset paper, painting newspapers, coated paper, dictionary paper, cover paper, stamp paper, and bond paper. Cardboard, yellow cardboard, hemp paper, etc., is actually a bound paper version.
Newsprint, commonly known as white paper, is a thin layer fabric made of more than 80% mechanically ground wood pulp mixed with other wood pulp. It is characterized by loose and porous, with a certain mechanical strength, good absorption, can make the ink penetrate in a very short period of time, and will not be dirty when folded. It is used to print newspapers, periodicals and general books on high-speed rotary machines. According to the technical standards issued by Ministry of Light Industry GB 1910-80, the basis weight of newsprint is 51 g/m2, and the length of web break (strength index) is between 2000 and 2700 meters. Smoothness is from 25 to 40 seconds, and whiteness is 45%. 50%. The width of reel newsprint is 1572mm, 1562mm, 787mm, and 781mm. The size of planographic paper is 787mm and 1092mm. Newsprint printing adaptability, opaque, but the whiteness is low, the surface smoothness is different, when printing the picture should use a coarser mesh, after the eyes are easy to yellow crisp, not long-term preservation.
Letterpress (printing) paper A type of paper that is suitable for letterpress printing of the texts of various books, sports articles, and magazines. According to the QB24-72 technical standard, the letterpress printing paper should be made from bleached chemical wood pulp, mechanical wood pulp, chemical pulp, and other grass pulps, and be filled with 10% to 20% of fillers, with a basis weight of 52 g/sq. Meters and 60/sqm, with two types of web and flat paper, with a length of not less than 2200 meters in longitudinal direction, smoothness from 30 seconds to 150 seconds, whiteness ≥ 60%, sizing degree not less than 0.25 mm, opacity Not less than 88%. Toppan printing paper is a widely used book paper. It is slightly smoother than newsprint and has a longer shelf life. However, it is prone to linting up, and is not suitable for printing books and journals using offset printing. This kind of paper is easy to smoke.
Offset printing paper, formerly known as "Dowlin paper," is a type of paper used for offset printing. It is suitable for printing monochrome or multi-colored book covers, texts, inserts, pictorials, maps, posters, color labels, and various packaging items. According to the specification (QB25-80), Offset printing paper is divided into No. 1, No. 1 and No. 2, the basis weight is from 70 g/m2 to 150 g/m2, and the smoothness is from 30 seconds to 100 seconds. Not less than 77%, length of long-cut web is not less than 2800 meters in length, horizontal-to-vertical average value of lithographic paper is not less than 2000 meters, sizing degree is not less than 0.5mm, stretchability is not more than +2.5% in transverse direction after soaking, and folding endurance 3 to 7 times. The proportion of pulp, bleached chemical pulp should account for more than 50%, and other broken pulp, bamboo pulp or other grass pulp, to ensure that it has a higher strength and printability. Offset printing paper is a relatively high-grade book printing paper. It has high requirements for whiteness, flexibility and surface strength, and the pH (acidity) should be close to neutral or weakly alkaline, so as not to affect the printing paper. Quantitative 40 g/m2 to 80 g/m2, other properties similar to double-sided offset printing paper. In recent years, it has also succeeded in trial production of low-quantitative offset newsprint paper and offset book paper for use in offset newspapers and books.
Coated paper, also known as coated paper, is a layer of high-grade printing paper that is coated with a layer of white paint formulated with calcium carbonate, kaolin, or the like and an adhesive on a base paper, and then dried by calendering. Due to its fine whiteness, high smoothness and gloss, and moderate oil absorption, it is suitable for copperplate printing or offset printing, printing color or monochrome pictorials, pictures, calendars, maps and books, as well as packaging and printing paper. It is divided into single-side coating and double-side coating. Two of them are divided into No. 1, No. 2, No. 3 and No. 3, with a basis weight of 80 g/m2 to 250 g/m2 and a smoothness of 600 seconds. To 1500 seconds, the whiteness is not lower than 80%, the coating PH value is not less than 7, and the coating amount is 10 g/m2 to 35 g/m2. Coated paper requires a higher coating strength, can not afford powder, can be suitable for 60 lines / cm or more fine mesh printing. (To be continued)
Newsprint, commonly known as white paper, is a thin layer fabric made of more than 80% mechanically ground wood pulp mixed with other wood pulp. It is characterized by loose and porous, with a certain mechanical strength, good absorption, can make the ink penetrate in a very short period of time, and will not be dirty when folded. It is used to print newspapers, periodicals and general books on high-speed rotary machines. According to the technical standards issued by Ministry of Light Industry GB 1910-80, the basis weight of newsprint is 51 g/m2, and the length of web break (strength index) is between 2000 and 2700 meters. Smoothness is from 25 to 40 seconds, and whiteness is 45%. 50%. The width of reel newsprint is 1572mm, 1562mm, 787mm, and 781mm. The size of planographic paper is 787mm and 1092mm. Newsprint printing adaptability, opaque, but the whiteness is low, the surface smoothness is different, when printing the picture should use a coarser mesh, after the eyes are easy to yellow crisp, not long-term preservation.
Letterpress (printing) paper A type of paper that is suitable for letterpress printing of the texts of various books, sports articles, and magazines. According to the QB24-72 technical standard, the letterpress printing paper should be made from bleached chemical wood pulp, mechanical wood pulp, chemical pulp, and other grass pulps, and be filled with 10% to 20% of fillers, with a basis weight of 52 g/sq. Meters and 60/sqm, with two types of web and flat paper, with a length of not less than 2200 meters in longitudinal direction, smoothness from 30 seconds to 150 seconds, whiteness ≥ 60%, sizing degree not less than 0.25 mm, opacity Not less than 88%. Toppan printing paper is a widely used book paper. It is slightly smoother than newsprint and has a longer shelf life. However, it is prone to linting up, and is not suitable for printing books and journals using offset printing. This kind of paper is easy to smoke.
Offset printing paper, formerly known as "Dowlin paper," is a type of paper used for offset printing. It is suitable for printing monochrome or multi-colored book covers, texts, inserts, pictorials, maps, posters, color labels, and various packaging items. According to the specification (QB25-80), Offset printing paper is divided into No. 1, No. 1 and No. 2, the basis weight is from 70 g/m2 to 150 g/m2, and the smoothness is from 30 seconds to 100 seconds. Not less than 77%, length of long-cut web is not less than 2800 meters in length, horizontal-to-vertical average value of lithographic paper is not less than 2000 meters, sizing degree is not less than 0.5mm, stretchability is not more than +2.5% in transverse direction after soaking, and folding endurance 3 to 7 times. The proportion of pulp, bleached chemical pulp should account for more than 50%, and other broken pulp, bamboo pulp or other grass pulp, to ensure that it has a higher strength and printability. Offset printing paper is a relatively high-grade book printing paper. It has high requirements for whiteness, flexibility and surface strength, and the pH (acidity) should be close to neutral or weakly alkaline, so as not to affect the printing paper. Quantitative 40 g/m2 to 80 g/m2, other properties similar to double-sided offset printing paper. In recent years, it has also succeeded in trial production of low-quantitative offset newsprint paper and offset book paper for use in offset newspapers and books.
Coated paper, also known as coated paper, is a layer of high-grade printing paper that is coated with a layer of white paint formulated with calcium carbonate, kaolin, or the like and an adhesive on a base paper, and then dried by calendering. Due to its fine whiteness, high smoothness and gloss, and moderate oil absorption, it is suitable for copperplate printing or offset printing, printing color or monochrome pictorials, pictures, calendars, maps and books, as well as packaging and printing paper. It is divided into single-side coating and double-side coating. Two of them are divided into No. 1, No. 2, No. 3 and No. 3, with a basis weight of 80 g/m2 to 250 g/m2 and a smoothness of 600 seconds. To 1500 seconds, the whiteness is not lower than 80%, the coating PH value is not less than 7, and the coating amount is 10 g/m2 to 35 g/m2. Coated paper requires a higher coating strength, can not afford powder, can be suitable for 60 lines / cm or more fine mesh printing. (To be continued)
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