1. Through the production of materials and technology classification, there is usually newsprint, is the newspaper, it is made of reed, coated paper, is made of tree poles, the two-piece tape, is also made of tree poles, compared with the bond, waterproof performance is better, because it needs to be double-sided sizing; Kraft paper, is the use of pine rods, the root of the production, more rough, the process is simpler; there is cardboard, generally more than 200 grams of papers, are called cardboard, cardboard, the higher the number of grams, the higher the price, generally add 10% to 15%.
2. According to the paper's grams of classification, the weight of the paper refers to the weight of the paper per square meter. There are 28 grams, 52 grams, 64 grams, 80 grams, 105 grams, 128 grams, 157 grams, 200 grams, 250 grams, 300 grams and so on, these are the national standard paper gram.
General printed form, stationery, forms with 28 grams of paper; Printed newspaper is generally 52 grams of newsprint, there is a light coated paper, generally 64 grams, it's less mineral, anti-wrinkle, tensile and so on coated. Coated paper, also known as heavy coating, its anti-wrinkle, tensile performance is better.
3. According to the classification of paper, there are domestic standards and international standards. Domestic standards are generally 787*1092 mm paper, that is, we commonly used 8K, 16K paper; International standard is 889*1194 mm, generous paper, that is, A4, A3.