Commonly used printing processes for carton products include offset printing, relief printing (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 in a comprehensive manner, and the appropriate process should be selected for printing production. The printing quality of the product.
1. Offset printing process
The offset printing process has multi-color group, multi-function roll paper 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. Corrugated cardboard on the production line is directly mounted and bonded. The latter has a printing speed of up to about 10,000 sheets per hour. It is suitable for printing carton products produced in medium and small batches. The printing specifications of facial paper can be flexible. The flat paper machine can also print fine corrugated cardboard directly, its overprint accuracy is higher than the former, and the quality is relatively stable. The offset printing ink layer is thin, which is more suitable for the printing of fine line plates and multi-color screen printing plates for overprinting or overprinting. It has high dot resolution, rich layout layers, clear tone boundaries, soft colors, and good printing reproduction. The production of plate is easy and fast, the operation of plate installation and proofreading is easy and the production cost is relatively low. It is widely used in the printing of color preprinted carton face paper.
2. Gravure process
The gravure printing process is also divided into web and flat paper printing machines. There are also various models of color groups and functions. This printing process has the characteristics of high printing plate durability and fast printing speed. Because the gravure ink layer is thick, the printing ink color is full and full of three-dimensional sense, the layout of the printing layer is rich, the texture is strong, and the printing ink color dries faster, so it is more suitable for large area and thick ink printing products. The gravure printing process can be suitable for printing solid, spot color line plates, and fine screen printing plates. Compared with offset printing, flexo printing, or silk printing, this process is the least likely to produce printing chromatic aberration. The quality of the printed products of the carton is The most stable and the best. Because the gravure plate is made of steel roller materials through electroplating, electro-engraving and other processing processes, the plate-making process is more complicated, the plate-making materials and costs are also more expensive, and the plate-changing operation is also more troublesome, so it is particularly suitable for batch Larger preprinted carton printing production can better reduce production costs.
3. Flexible printing process
The flexographic printing process is also divided into web and flat paper multi-color printing machines. Among them, flat paper printing machines have pre-printing models for printing face paper, and direct printing on corrugated cardboard, and can be completed online. Indented, slotted unit. The flexographic printing process is compatible with the advantages of letterpress, lithographic and gravure printing processes. Because the printing plate is flexible, the printing pressure is much lighter than other processes, with lighter printing pressure, thick printing ink color, clear imprint, and printing plate resistance to printing The main feature of high rate. This process can print both cardboard with good surface gloss and cardboard with rough surface; both non-absorbent materials and cardboard with strong absorption; both thin and thick paper; It is suitable for printing fine screen version and line version, but also suitable for printing line or field version of spot color. Flexographic printing plate materials are divided into rubber plates and resin plates. The main materials of rubber plates are natural rubber and synthetic rubber. There are three types of plate-making: manual engraving, laser engraving and casting. When using the rubber plate, we should pay attention to its printing suitability, such as considering the ink affinity, ink transferability, coverage and reproducibility of the rubber, use water-based ink printing, use natural rubber plate material than synthetic rubber The material is better.
Butyl rubber plate is more suitable for the use of solvent-based ink. When using nitrile rubber plates, solvent-based inks should be avoided as much as possible to prevent the plates from being corroded and damaged by solvents. The rubber plate also has the disadvantage of being easily deformed and cracked, so it is not suitable for printing fine products. The photosensitive resin plate-making process is very simple. Its plate-making speed is much faster than that of hand-carved and cast rubber plates. The plate-setting operation is convenient, the printing plate has good ink transfer performance, and the printing quality is relatively stable. The plate has better tolerance, can reproduce finer levels of high-gloss dots, and can reproduce more than 2% of dots and print 150-line textured plates. The expansion rate of the solid resin plate is much smaller than that of the rubber plate and liquid resin plate, so it is more suitable for the production of multi-color overprinted anilox plates and line plates. However, the price of the solid resin plate is relatively high, and the production cost is relatively high. Therefore, it is more suitable for printing bulk packaging products.
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