Corrugated board is made into corrugated box by die cutting, indentation, nailing box or pasting box. Corrugated box is one of the most widely used packaging products, and its consumption has always ranked first among all kinds of packaging products. Comprise a calcium plastic corrugated box. For more than half a century, corrugated boxes have gradually replaced wooden boxes and other transport packaging containers and become the main force of transport packaging because of their superior performance and good processability. In addition to protecting commodities and facilitating storage and transportation, it also plays the role of beautifying commodities and publicizing commodities. Corrugated box is a green product, which is beneficial to environmental protection and loading and unloading transportation. 1856, Edward Healy and Edward Allen, two brothers from England, invented corrugated paper as the lining of hats to breathe and absorb sweat. 187 1 year, AlbertJones, an American, invented single-sided corrugated board for packaging glass lampshades and similar fragile articles, and obtained the first patent in the United States. By the end of 19, the United States began to study the use of corrugated cardboard to make packaging and transportation boxes. 1920 double corrugated cardboard came out and its use expanded rapidly. During World War I, corrugated boxes only accounted for 20% of transport packaging. However, during World War II, corrugated boxes accounted for 80% of transport packaging. Corrugated box has become the most widely used packaging container in modern commerce and trade, and it is also one of the most important packaging forms adopted by all countries in the world today. Printing methods in printing and packaging industry mainly include offset printing (ink color printing) and letterpress printing (carton ink printing). Among them, carton water-based printing has higher strength, lower cost, higher production efficiency (faster delivery) and the overall printing effect is close to color printing, so it is widely used in product transportation and packaging. The main production processes of corrugated boxes include automatic corrugated board production line, printing process, post-treatment and molding process; The printing work has basically realized one-time automatic operation of printing, slotting, die cutting, box pasting and packaging. Second, the principle of water-based printing Water-based printing belongs to additive printing. The color manuscript is made into a negative image by electronic color separation, and then printed by a printing machine. The ink is transferred from the anilox roller of the printing machine to the printing plate, and then from the printing plate to the corrugated board. Through color registration and color superposition, the front image is obtained, so as to copy the original sample box and reproduce the quality of the original. Principle of four primary colors: red, yellow, blue, black (strictly speaking, three primary colors: red, yellow and blue) and intermediate color: two primary colors plus: red+yellow = orange (orange red, orange yellow); Red+blue = purple (cherry red, eggplant purple); Blue+yellow = green (dark green, light green). 3. Pre-press technology (traditional plate making) processes the color manuscript into monochrome through electronic color separation and then makes it into film (negative film); Back exposure: exposing the back of the printing plate with ultraviolet rays to form a printing plate base; Main exposure: remove the protective film on the front of the plate, put a negative picture on it, cover it with a vacuum film, and after vacuumizing, perform main exposure with ultraviolet light to transfer the contents of the negative picture to the printing plate; Plate washing: Wash the plate with liquid medicine in the plate washing machine to wash off the unexposed resin on the printing plate to form a concave-convex printing plate. Drying: debonding: irradiating with ultraviolet light source; After exposure: hardness adjustment. Four. Classification of printing materials-base paper The national standard for corrugated base paper is divided into four types: A, B, C and D. Class D corrugated paper is basically eliminated by the market, and few manufacturers buy and use it. Vermicelli kraft paper (American card, Russian card). Features: long fiber, heavy sizing, high physical strength and rough cardboard; Pure wood pulp or a small amount of OCC. Abbreviation: imported cattle card. Imitation cowhide cardboard. Features: the surface is hung with 15-25% wood pulp, and the rest is OCC；; Fiber is shorter and its strength is worse than kraft paper. The surface of the paper is smooth, and it is treated with different degrees of sizing (water absorption ranging from 30 to 55g/m2) and surface dyeing. Abbreviation: Domestic Cattle Card. White cardboard. White cowhide, surface bleached wood pulp, and the rest are natural or dyed wood pulp. (Russia, Sweden, Finland); Whiteboard paper (the surface is bleached wood pulp, and the rest is deinked or non-deinked waste paper); Coated white paper (white characters on white background, white characters on gray background,-). Recycled paper they are all OCC, but they are different from corrugated paper. AOCC vermicelli, surface 1 1# and dyed). In the market, it is generally called C-grade box board paper, and some are called T-paper. Basic properties of carton base paper. Physical indicators: ration, moisture content, compactness, bursting strength (bursting index), ring pressure strength (ring pressure index), positive/negative water absorption and folding endurance. Appearance indicators: smoothness, color difference and whiteness. Specific base paper standards: GB 13023 (national standard for corrugated paper) and GB 13024 (national standard for boxboard paper). Relevant projects refer to the latest industry trends or standards. Basic production technology of papermaking Traditional papermaking technology: raw materials: wood or grass fiber. Modern papermaking technology: raw materials: commercial wood pulp and waste paper.