Corrugated Boxes Of Kraft Paper Quality Control in The Production Process Of CDI Direct Platemaking Technology

Corrugated Boxes Of Kraft Paper Quality control in the production process of CDI direct platemaking technology

In recent years, with the improvement of environmental awareness, flexographic printing is known and familiar to more and more people. At the same time, the flexible version of laser digital direct imaging technology has gradually become a hot topic. At present, the more popular use of CDI(Cyrel Digital lmager) in the industry, this direct plate making technology, the quality control of each process in the entire production process is worthy of our common discussion.

Compared with traditional flexo printing, from the perspective of prepress processing technology, the prepress processing personnel who use CDI plate making process have very different priorities to consider. The advantage of the digital version (CDI printing plate) over the traditional printing plate is that on the same thickness of the printing plate, for the same thickness of the line, the same network percentage, the slope Angle of the CDI printing plate support base is about ten degrees larger than the traditional version. This result is reflected in the printing, making the CDI version of the printing than the traditional version of the expansion rate is smaller, the line is clearer, and the thickness change is easier to control.

In the traditional version of pre-press processing, if the rough positive lines are reduced and the fine negative lines are thicker, the image level should be reduced by about 15%. The use of CDI plate making method, in principle, the smallest positive line is not less than 0.03mm, the smallest negative line is not less than 0.08mm. In order to improve the printability and printability of the printing plate, the minimum dot on the printing plate should be 2% or more, the minimum independent point diameter is not less than 0.15mm, and the living parts undertaken should avoid including a long monochromatic gradient of the absolute net, when the multi-color overlay is encountered and one or two colors are gradually changed to zero, it is best to mention the minimum dot 2%, if it is necessary to do the absolute net, It is necessary to make 2% to 0% as much as possible into a uniform stepped arrangement and the range should not be too long. If you encounter a large area of field gradient to the net, in most cases, this field is made into two versions to prevent the ink layer is not thick, and in the specific process, it is necessary to shrink the bottom of the color version in a gradual way on the basis of the original big color version, and the retracted background color as far as possible to hide the net place in 60% to 70% of the primary color. In this way, the phenomenon of sudden hard mouth at the absolute net of the background color version is avoided, and the original large color version tries to increase the minimum dot to 2%.

In addition, some improvements can be made when CDI is used in the processing of pre-press leak repair. The filling white is mainly a process designed to compensate for the registration error of the printing press, but the filling white also brings another adverse result, that is, the original design will be changed in a small part. For example, if the poinsettia color block and a blue block are connected by a 0.15mm button, the adjacent place of the two color blocks will produce purple lines close to 0.15mm width, which is not acceptable to customers for some demanding products. In the CDI process, we can use the advantages of the large slope of the CDI printing plate to support the base and the clear edge of the printing line to adjust the thickness of the set of the color plate, that is, the set line of the CPI version is changed from the 0.1 commonly used in the traditional version to 0.05 ~ 0.07mm. At the same time, the buckle in the live parts can be adjusted to about 0.07 ~ 0.1mm.