With the development of society and the continuous improvement of people's living standards, when purchasing goods, consumers not only require the inherent quality of the goods, but also put forward higher requirements for the packaging of the goods. This includes not only the design requirements for the packaging and decoration of commodities, but also the quality requirements for the post-press processing of the packaging. The partial compaction of the printed material produces traces, so that it has a certain sense of unevenness in space is called indentation.
The indentation processing technology was originally only used for the formation of paper packaging boxes, and was gradually applied to the surface processing of various types of printed products, especially the surface finishing processing of relatively high-end carton, carton, trademark, artwork and other surfaces. Now, indentation technology is one of the important means to achieve packaging design, which not only plays an important role in the final quality and effect of packaging, but also greatly improves the artistic effect of printed matter, and has given new features to printed matter. An important means of value-added and promotion of printed materials. Therefore, the indentation technology is more and more valued by the industry, and the range of use is also getting wider and wider. However, in the die-cutting and creasing process, a series of problems often occur, which affect the smooth progress of production. , I hope to help the actual production.
1. Common indentation problems
The principle of automatic horizontal flat-bed die-cutting machine is similar to that of offset printing machine. The faults are not analyzed here. The following is only an analysis of common problems in die cutting.
Uneven pressure
We know that indentation is a line mark caused by folding, squeezing, or wrinkling. The entire process of indentation is: design-proofing-typesetting-versioning-pad version-boot-finishing-finished product. In the manufacturing process of folding cartons, the line marks are a controlled deformation on the cardboard. The principle of indentation is that the paperboard is pressed between two fixed surfaces (concave and convex), and the internal fiber structure of the paper is destroyed, resulting in partial delamination of the paper and the formation of concave and convex line marks on the outside. When the cardboard connected by the indentation is folded at 90 degrees or 180 degrees, the fiber bonding (cohesion) inside the paper is completely separated.
The pressure is not uniform during the indentation process. There are generally two situations: one is slight unevenness. If the pressure is slightly uneven, it may be due to the uneven distribution of die-cutting knives and wires (steel knives, steel wires), which causes the moving platform to be skewed during die-cutting. At this time, the die-cutting plate should be installed. Balance the knife line to make the platform evenly stressed. It may also be affected by the paper fiber trend. When the paper is transverse to the blade line, the indentation effect is better. The other is serious unevenness. If there are serious pressure unevenness at the four corners of the platform, it is mainly caused by the inconsistent height of the four connecting rod swing rods supporting the moving platform. At this time, the shield of the die-cutting base should be opened to check whether the swing rod is worn. If the wear is serious, you need to replace it, otherwise you need to adjust four pressure adjustment irons until the pressure is consistent.
Line burst (color burst)
When the creasing mold (punch) steel wire is pressed into the groove, the cardboard is subjected to three forces: pressure, tension and surface tension. In addition to permanently deforming the paperboard, these three forces also reduce the cohesion between the fibers of the various layers of the paperboard. During folding, the surface of the paper is subjected to tension and the inner layer is subjected to pressure. If the pressure exceeds the cohesion between the fibers of the paper, the fibers inside the cardboard will break, and the paper becomes soft and flexible at the folding point. But the pressure should not be too large, when the cardboard tension is exceeded, the foreign monster will break (burst when the cigarette pack is packaged). During the die cutting process, the surface tension of the cardboard will increase as the number of indentations applied to the cardboard increases. Blasting refers to the cracking of the paper at the indentation when the product is die-cut or when the finished product is folded. This is a common problem in indentation, especially in dry weather. It should be analyzed according to specific conditions:
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