1. Offset printing process The offset printing process has multi-color, multi-functional web and flat paper models. The former has a higher production speed and is suitable for printing pre-printed cartons with large production batches and relatively fixed product structures. Surface printing Afterwards, it can be directly laminated and bonded with the corrugated cardboard on the corrugated production line. The latter has a printing speed of up to 10,000 sheets per hour, which is suitable for printing medium and small batches of carton products. The printing specifications of facial paper can be flexible and changeable. The flat paper model can also directly print fine corrugated cardboard, and its overprint accuracy is higher than the former, and the quality is relatively stable. The thin ink layer of the offset printing process is more suitable for overprinting or overprinting of fine line plates and multi-color anilox plates. It has high dot resolution, rich layout layers, clear gradation boundaries, soft tones, and good printing reproduction. The production advantages of convenient and fast plate making, easy plate loading and proofreading operation and low plate making cost are widely used in the printing of color pre-printed carton surface paper.
2. The flexographic printing process The flexographic printing process can also be divided into web and flat paper multi-color printing machines. Among them, flat paper printing machines have pre-printed models for printing surface paper, and direct printing on corrugated cardboard. A unit that can complete slitting, creasing, and slotting online. The flexographic printing process is compatible with the advantages of letterpress, offset and gravure printing processes. Because the printing plate is flexible, the printing pressure is much lighter than other processes. It has lighter printing pressure, thick printing ink, clear imprints, and printing plate resistance. The main feature of high rate. This process can print cardboard with good surface gloss and rough surface; it can print non-absorbent materials and cardboard with strong absorption; it can print both thin paper and thick paper; both It is suitable for printing fine mesh plates and line plates, and also suitable for printing line plates or solid plates with spot colors. Flexographic printing plates are divided into rubber plates and resin plates. The main materials of rubber plates are natural rubber and synthetic rubber. Its plate making has three types: hand engraving, laser engraving and casting plate making. When using a rubber plate, pay attention to its printability. For example, considering the ink affinity, ink transfer, coverage and reproducibility of the rubber, use water-based ink for printing, and use natural rubber plate material than synthetic rubber plate Good material.
3. Gravure printing process The gravure printing process is also divided into web and flat paper printers. There are also multiple models of color sets and functions. This printing process has the characteristics of higher printing plate durability and faster printing speed. Because the gravure ink layer is thicker, the printing ink color is full and full of three-dimensional effect, the layout is rich in printing layers, the texture is strong, and the printing ink color dries quickly, so it is more suitable for large area and thick ink printing products. The gravure printing process is not only suitable for printing solid, spot-color line plates, but also fine anilox plates. Compared with offset printing, flexo printing or silk screen printing, this process is not easy to produce printing color difference, and the quality of carton printing products is stable And excellent. Since the gravure printing plate is made of steel roller material through electroplating, electric engraving and other processing processes, its plate making process is more complicated, the plate making materials and costs are also expensive, and the plate changing operation is also more troublesome, so it is especially suitable for batches Larger pre-printed carton packaging and printing production can better reduce production costs.
