As the most important part of product image, the requirement for label "face value" is getting higher and higher. In the days of waiting for the sunshine, the demand for environmental protection of labels is also increasing. The use of environmental flexo printing to consume high-value labels is an important direction for future label development. In all flexographic applications, the quality requirements of label printing are far higher than those of other flexographic applications. The choice of plate is different under different printing requirements.
Different printing materials and plate selection
With regard to hanging plate printing with paper as the main printing material, customers may not be most concerned about the dot parts of the printed products, but have a high demand for the field. Therefore, plates with medium or low hardness and good ink transfer rate will be more widely used by such users.
For thin film label printing, the sudden change of high light and the reproduction of precise dots are more concerned, so the printing plate with high hardness and high resolution, which can carry precise dots, is often welcomed by printing enterprises.
Different Ink and Printing Plate Choice
For different products, in addition to the commonly used UV ink, the use of ink in food and pharmaceutical printing areas is also gradually expanding. Different flexographic plates may have different printing performance under different ink systems due to their different printing characteristics.
Therefore, when considering flexography, printing enterprises should first fully understand the conditions of customers and themselves, and then only when they encounter problems can they see the substance and deal with it easily. At the same time, in response to these needs, flexographic plate suppliers have actively developed a number of flexographic plates for different printing needs. According to the different materials and manufacturing methods of these plates, they can be divided into solid photosensitive resin solvent plate, water-washed plate, heat-sensitive plate, rubber direct engraving plate and so on.
Selection of Flexographic Materials Based on Different Properties of Plates
First of all, the printing quality of plate material is our most concerned, including the carrying capacity of high-light dots (plate resolution), the recovery performance of fine lines, the reproduction ability of anti-white words and lines, dot expansion level, the restoration of middle tone, the transfer ability of field ink, and the printing table with field screen. Now and other elements. The resolution of the printing plate will directly affect the reproduction of high-precision images. For example, in recent years, more high-definition flexo printing technologies have been implemented. It is necessary to select the minimum dots which can stabilize the printing plate to less than 12 microns in order to meet the printing needs of high-end labels such as daily chemicals. Of course, the plate-making process itself is also more demanding. Accurate control.
Secondly, the comprehensive printing suitability of printing plate in the printing process also needs to be considered, touching on the compatibility of printing plate with rough surface material, compatibility with different UV ink and water ink, the level of durability of printing plate and the stability of repeated use will greatly affect the smooth stop of consumption. For example, in label printing, many printing factories have presented a phenomenon, printing plate in the early start of the printing machine showed the problem of poor ink transfer, and after 1000-2000m printing, the printing effect gradually normal. Apart from other elements in the printing environment, for printing plates, this phenomenon is often associated with poor washing and drying.
When the solvent of plate washing is unbalanced, that is, the proportion of each component of the solvent of plate washing is imbalanced, the solvent of plate washing has a great impact on the appearance performance of plate, forming a plate that is not ink-friendly and the transfer of ink is poor. Of course, if the plate washing equipment can not remove the residual solvent of plate appearance, while drying is not sufficient, 1. This will lead to the problem. But if we can choose a kind of printing plate which is insensitive to the change of solvent and can be quickly dried, this kind of problem will be solved.
After a brief analysis of the above plate-making technology and plate evaluation methods, I hope it will help label users to select suitable products according to the characteristics of enterprise equipment and products through objective, scientific and fair evaluation methods, and achieve double failures in technology and efficiency.