Flexo printing is the best way to print corrugated boxes, which has reached consensus at home and abroad. The flexible printing corrugated box has the following advantages:
â— Flexo printing can print both the field version and the screen version
Foreign countries tend to use E-corrugated cardboard with white-faced paper (coated white cardboard or 80g / m2 single-sided coated paper and offset paper) to print high-end corrugated cardboard boxes with 100 lines / in. Below 80 lines / in, 40-60 lines / in is commonly used. Printing the screen version on the kraft paper is generally not a three-color printing, and the number of screen lines should not exceed 60 lines / in.
â— Flexible version is flexible
The flexographic version is soft and flexible, and can compensate for the thickness error and the uneven surface of the corrugated cardboard during the printing process by its own compression deformation, so that the ink layer is more uniform, thereby improving the printing quality.
â— Flexible printing is light pressure printing
Corrugated cardboard has uneven corrugation during the printing process. The corrugated cardboard is under high pressure, and the corrugated cardboard is under low pressure. Sometimes, the corrugated cardboard is out of contact and the ink cannot be printed. Neither offset printing nor gravure printing can overcome this defect, resulting in serious corrugated marks. The flexo printing is light pressure printing, the plate can be in good contact with the corrugated cardboard after compression deformation, and the high corrugated position will not produce serious marks or even collapse due to excessive pressure.
â— Flexible printing can use water-based ink
Flexographic printing uses a metal anilox roller ink transfer system, which can use water-based ink. The corrugated cardboard is printed with water-based ink. The printing plate only needs to lightly touch the corrugated cardboard, and the water-based ink will be almost completely absorbed.
â— Simple structure of flexo printing machine
The area of ​​the corrugated cardboard box is large, and the length of the cardboard can reach 2-3m. If offset printing is used, the equipment is huge, and the operation and maintenance are difficult. The structure of the flexo printing machine is simple. The four rollers are made into a color group. After the diameter of the roller is increased, the mechanical performance and stability can be improved. It is convenient to install, adjust and clean.
â— Able to form a linkage production line with other processing equipment
Due to its simple structure, flexographic printing presses can be produced in conjunction with other processes. At present, most corrugated cardboard printing machines are combined with creasing machines and slotting machines for online production. It is combined with creasing, slotting, die cutting, gumming, The box making and counting device together form a printing production line, which can directly print corrugated boxes once and form.
Modern corrugated box flexo printing mainly has two production processes: post-printing and pre-printing. Post-printing is to produce corrugated cardboard, and then print on it with a single-sheet cardboard flexo printing machine. After slotting, die-cutting and other post-processes can be completed online with printing. Pre-printing is to use a rotary flexo printing machine to print face paper before corrugated board production, and then send the printed face paper to the tile line to produce color-faced corrugated board, and then convey to the next process to form the box. Among them, pre-printing is the most widely used process in corrugated flexo printing today.
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