Many varieties of paper, according to the classification inconsistent thickness and weight of paper into paper and paperboard. There are no strict distinction between the two boundaries. Weight 200g per square meter generally following the principle known as NCR paper, cardboard called over. Cardboard accounting for about 40 to 50 percent of paper production, mainly for carbonless paper packaging manufacturers, such as cardboard, packaging cardboard. Paper and cardboard were generally statistically internationally. ① quantitative physical performance: weight per square meter, in g / m, said. As quantitative cultures printing paper is generally 32 ~ 80g / m, quantitative cardboard is generally 200 ~ 400g / m. ② thickness: measurements between two plates, the price applied NCR 100kPa pressure, direct measurement of the thickness, in mm. ③ tightness: indicates the degree of tightness of the sheet structure, the weight per cubic centimeter of the paper in g / c represents?. The same quantity of paper NCR, large paper thickness on the loose. ④ porosity and permeability: Fair paper contains 70% porosity. The air permeability of the paper based on a certain area at a certain degree of vacuum, the amount of air per minute through the air or through a certain amount of time, respectively, ml / min or s / 100ml expressed. ⑤ expansion rate: After soaking paper or at various temperatures after humidification or dehumidification, the relative change the paper size to the size of the increase or decrease of the percentage of the original sample sizes represented. Offset paper for expansion rate higher. ⑥ strength: Paper by external force to achieve some specific values ??reflected in the failure point. There are tensile strength and elongation at break, bursting strength, folding, tearing and stiffness. The strength of the index is particularly important for wrapping paper. ⑦ ignition point: usually 130 ~ 255.5 ℃. NCR price, NCR, Jinzhou provided by Xinxiang City Paper Co., Jinzhou new material. Xinxiang City, Jinzhou New Materials Co. (www.hnjinzhou.com) strong, credible, in Xinxiang paper and paper processing industry has accumulated a large number of loyal customers. The company better work attitude and constantly improving innovative ideas will lead Jinzhou Paper and you hand into the brilliant, for a better future!