As an important part of product image, the requirement of "appearance level" of labels is getting higher and higher. In the sunny days, the demand for environmental protection of labels is getting higher and higher. Using environmental flexo printing to produce labels with high appearance level is an important direction for the future development of labels. In all flexographic printing applications, label printing requires higher quality than other flexographic printing applications. The choice of plate for different printing requirements.
Selection of printing materials and plates
For paper as the main printer of label printing, customers may be the least concerned about the dot part of printing, and the site requirements are very high. 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 gradual change of mirror light and the replication of fine dots are more concerned, so the printing plate with high hardness, high resolution and the ability to carry fine dots is often welcomed by printing enterprises.
Selection of Ink and Printing Plate
For different products, besides the extensive use of UV ink, the application of ink in food and pharmaceutical printing is also gradually expanding. Different flexographic plates may have different printing performance in different ink systems due to different printing characteristics.
Therefore, when considering flexographic printing enterprises, first of all, we should fully understand the situation of customers and ourselves, and then when we encounter problems, we should see the essence and deal with them easily. At the same time, in order to meet these needs, flexographic vendors are also actively developing different printing requirements of flexographic plates. According to the different materials and production methods of these plates, they can be divided into solid photosensitive resin solvent version, wash version, hot version, rubber engraving board, etc.
Choose different flexographic materials according to different properties of sheet metal
Firstly, we pay more attention to the quality of printed boards, including the bearing capacity of mirror branches (resolution boards), reducing the performance of small text lines, reproducing the ability of white text and lines, expanding the network, gradually reducing the ink transfer capacity, field and printing performance of the network and other factors. For example, in recent years, in order to promote high-definition flexographic printing technology, the smallest branch must be selected to stabilize at 12 micron plate, which can meet the needs of Japan, such as high-end label printing, plate-making process itself, and of course, a more precise control is also needed.
Secondly, the suitability of printing must be considered comprehensively in the printing process, which involves the compatibility of printing plate and rough surface materials, the compatibility of different UV ink and ink, the durability of printing plate and the stability of reuse, which will greatly affect the smooth production. For example, in label printing, a phenomenon has appeared in many printing factories. Ink transfer was not good at the beginning of printing press start-up, but the printing effect gradually returned to normal after 1000m ~ 2000m printing. Regardless of other factors in the printing environment, this phenomenon is often associated with poor washing and drying.
When the washing solvent is unbalanced, the proportion of solvents in your version components and the surface properties of the solvent washboard have a great impact, resulting in no ink on the board and deterioration of the ink. Of course, if the remaining equipment can not wash the solvent to remove the material surface, the problem will also be caused under the condition of insufficient drying. But if we can choose a solvent which is insensitive to change and can quickly dry the plate, this problem will be solved.
Through the above brief analysis of plate making technology and plate material evaluation methods, I hope to help label users select appropriate products according to the characteristics of enterprise equipment and product objectives, scientific and fair evaluation methods, in order to achieve a double harvest in technology and efficiency.