1. Printing materials and ink use issues
The combined carton printing system incorporates different methods of printing technology, and different forms of printing technology require different printability of the printing materials. Generally, a more appropriate method is to improve the printability of the substrate to be used, so that it can meet the requirements of hybrid printing, especially the requirement of overprinting, and fully consider whether the printability of the selected substrate or ink is compatible with each other.
2. Speed ​​matching problem
On combination presses, the speed of printing is always tied to the slowest one in the assembly. The speed of screen printing is relatively slow. Due to factors such as ink and drying properties, the speed of general screen printing is usually controlled at 80 to 150 ft/min. The speed of flexo printing can reach more than 300 feet per minute. Therefore, in the flexo-screen printing combination printing, the speed of the flexo printing machine should be properly reduced to maintain the consistency with the screen printing speed. For sheet-fed presses, the problem of speed matching can be solved by connecting two or three low-speed printing units in parallel with a high-speed printing unit, such as dividing a printed sheet coming out of a high-speed printing unit into two or three rows by a separating device. The columns then enter the corresponding low-speed printing units. However, this method does not apply to rotary presses. The speed matching problem still depends on the speed increase of the low-speed printing unit.
3. Standardization issues
There is a question of whether each printing unit of a combined carton printing system is designed according to a uniform standard or designed according to its own standards. Designed according to a unified standard, each printing unit can work well in coordination, but lack of flexibility, may encounter a lot of trouble when working independently; according to the combination of the design of the printing unit, each unit maintains great flexibility, You can work online or independently, but coordination is not high and some mismatches may occur during the printing process. The ultimate solution to this problem is to rely on the introduction of industry standards, and on the other hand, to rely on different choices of the combined printing system.
4. The problem of screen printing itself
Screen printing is characterized by a thick ink layer and a relatively large amount of ink, which brings great difficulties to the drying of the ink. The drying time is obviously longer than other printing methods, and the production efficiency is relatively reduced. These intangibles have caused an increase in production costs. In addition, from the point of view of production control and quality, screen printing accuracy and quality stability are inferior to those of offset printing, flexo printing, and gravure printing.
Of course, combined printing is still at the beginning stage, and there are many technical issues and material issues that need to be explored and improved. However, there is no doubt that with the increasing personalization and diversification of printing, combined carton printing will be widely applied.
If you want to know more about carton information, search for the public number [Carton Street]
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