Factors affecting the fineness of flexographic printing products

In recent years, with the application of CDI technology in the flexo printing industry, flexo printing products have shaken off the image of early printing quality and poor precision, and gradually impacted on the middle and high-end markets. Today, many flexo manufacturers can produce beautiful products that are comparable to traditional offset and gravure printing. The scope of application of the product has also been extended from early low-grade packaging bags, carton corrugated paper, etc. to tobacco labels, wine labels, high-fidelity packaging, films, fine corrugated paper, and milk bags. But simply having a digital flexo does not mean having a high-precision flexo quality. Many manufacturers report that even with the use of high-quality digital flexo, product fineness has not achieved the desired results.

The influence of the substrate on product finesse

Coated paper with a basis weight of 90g/m2 or less is transported over long distances and stacked over a long period of time. The water content changes greatly with the surrounding environment. In addition, the length of the paper path of the flexo printer must be dried by a multi-color machine. If it is a thin paper, multiple deformations occur and the deformation direction is inconsistent. This has a great influence on the quality of multi-color overprinting products. Therefore, paper suppliers must strictly control the water content of the paper at the factory, shorten the period of transportation as much as possible, and avoid exposure to light during transit or staying in rainy weather. These measures are prerequisites for fine control of product quality in the printing process.

The effect of ink on product fineness

Fine prints usually meet the following quality requirements:

(1) The ground is smooth and delicate, with neat surroundings and no ghosting.

(2) The outlets are clear, distorted, and structured.

(3) Fine lines and small texts require clear lines, fine text, and no paste.

(4) Multi-color overprinting requires accurate overprinting, no leaks, and no overlapping frames.

Under the premise that the printing pressure has been adjusted in place, the ink properties are adjusted to maintain a stable viscosity and good printability, and the printed matter can meet the above four requirements.

The general ink viscosity of the product used in the field is 45`~60` (Paint 4# cup), and the ink leveling and hiding power of the viscosity range are both. Ink coverage is good, solid level; ink leveling is good, the field is delicate and shiny. The viscosity of the ink used in the cable products is 30`-40`(paint 4# cup). The viscosity range of the ink has good transfer performance, and the dot reproduction performance is strong. The printed product has clear dots and small deformation, and it is not easy to paste. Dirty version. Multi-color overprint products to meet the trapping is not under the premise of trapping parameters to the design of the minimum, a reasonable arrangement of the printing color sequence, to ensure that the latter color printing ink will cover the former color trapped live.

The influence of the printing process on the fineness of the product.

Printing process settings: such as the trapping parameter settings, the printing sequence before and after the arrangement, there is pressure convex, hot foil can not be connected to the post-process set the mark.

Relative to offset printing and gravure printing, the overlay accuracy of the flexographic printing press is poor. If the printed product must be subjected to hot stamping, embossing, and other post-processes, and it cannot be connected to the flexo printer, marking on the plate in advance is a prerequisite for ensuring the accuracy of the subsequent process, and it is also to ensure that the product packaging is fine after molding. The essential. Whether or not the product is printed properly after the package has been formed is an important aspect that reflects the fineness of the product.

In short, the improvement of the fineness of flexographic products has a close relationship with the choice of printing materials, ink adjustment, printing technology and printing operation level, in addition to the direct relationship between printing equipment and printing plate production.

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