The commonly used printing processes for carton products mainly include offset printing, embossing (flexo printing) and gravure printing. Each of these three printing forms has its own advantages. Therefore, according to the actual situation of the factory and the characteristics of the product, the pros and cons should be weighed comprehensively, and the appropriate process can be selected for printing production. Only in this way can printing production costs be reduced and printing production efficiency improved. The printing quality of the product.　　

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 can be suitable for printing pre-printed cartons with larger production batches and relatively fixed product structures. After facial paper printing, it can be combined with corrugated The corrugated cardboard on the production line is directly laminated and glued. The latter's printing speed can reach about 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 screen plates. It has high dot resolution, rich layout layers, clear gradation boundaries, soft colors, 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. Gravure printing process 　　

The gravure printing process is also divided into roll paper and flat paper printing machines, and 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 thick, the printing ink is full and full of three-dimensional effect, the layout is rich in printing layers, the texture is strong, and the printing ink drying speed is faster, so it is more suitable for large area and thick ink printing products. The gravure printing process is not only suitable for printing solid and spot color line plates, but also for printing fine anilox plates. Compared with offset printing, flexo printing or silk screen printing, this process is the least likely to produce printing color difference. The quality of the printed products of cartons is The most stable and best. 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 troublesome, so it is especially suitable for batches Larger pre-printed carton printing production can better reduce production costs.　　

3. Flexographic printing process 　　

The flexographic printing process can also be divided into web and flat paper multi-color printing presses. Among them, the flat paper printing machine has a pre-printed model for printing surface paper, as well as direct printing on corrugated cardboard, and can complete slitting and cutting online. Indentation and slotting unit. 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 cardboard with rough surface; it can print non-absorbent materials and cardboard with strong absorption; it can print both thin paper and thick paper; 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, covering power and reproducibility of the rubber, use water-based ink for printing, and use natural rubber plate material than synthetic rubber plate Good material.　　 Butyl rubber plate is more suitable for solvent-based inks.

When using nitrile rubber plates, try to avoid using solvent-based inks to prevent the printing plate from being damaged by solvent corrosion. Rubber plates are also easy to deform and crack, so they are not suitable for printing fine products. The photosensitive resin plate-making process is very simple, its plate-making speed is much faster than manual engraving and casting rubber plate, the plate loading operation is convenient, the printing plate has good ink transfer performance, and the printing quality is relatively stable. The plate has good latitude, can reproduce finer high-gloss dot levels, can reproduce more than 2% dots and print a 150-line mesh plate.

The expansion ratio of the solid resin plate is much smaller than that of the rubber plate and liquid resin plate, so it is more suitable for making multi-color overprint anilox and line plates. However, the price of the solid resin plate is relatively expensive, and the production cost is relatively high. Therefore, it is more suitable for printing bulk packaging products.