When it comes to the problems in the processing of micro corrugated boxes, we generally think of the conventional problems of poor pressure resistance and breakage resistance, poor die cutting, and glue opening of the paste box. In fact, these problems are relatively simple, so we only need to target them. It can be solved by processing it. However, the problem of elongation of semi-finished products in the production process of micro corrugated boxes and the corresponding shrinkage of finished products are comprehensive, and it is relatively difficult to solve.
Here, the author combines the experience of micro corrugated carton processing for many years, summarizes the causes and solutions of these problems, and shares with colleagues.
01 semi-finished product elongation problem and solution
1. Reason for elongation
Miniature corrugated cartons (especially micro corrugated cartons for food, electronics, pharmaceuticals, etc.) are usually produced by arranging multiple products. However, in the prepress design of the micro corrugated carton, the customer usually requires the design of the demarcation of each side of the carton and accurately processes them according to these boundaries during post-press processing. This is the so-called "dead color" in the industry (below) Referred to as "card position").
figure 1 Figure 1 is a layout of a standard card-sized micro corrugated carton. If the production according to the original document's cut-line drawing is not feasible, and if the elongation of the micro-corrugated carton semi-finished product in the production process is not well handled, it is difficult to ensure accurate card position and high yield.
The digital markings in Figure 1 are where the semi-finished products of the micro corrugated carton are more prone to elongation problems. Among them, it is easy to cut the text at the 1st mark, and it is easy to produce the phenomenon that the bleeding is not enough and the whiteness is marked at 2 places. It is easy to super-line or can not suppress the color edge when marking 3 or 4, when these processing problems appear on the same printed sheet at the same time, how to Getting better control is especially important .
However, it is even more difficult that the semi-finished products of similar or identical micro-corrugated cartons have different elongations when they are produced at different times, so there is no rule at all. The main reasons for the elongation of the micro corrugated cardboard semi-finished products are as follows.
figure 2 (1) Because the materials, manufacturers and brands of corrugated paper are not fixed, the performance of corrugated paper is also unstable, which leads to deformation of corrugated paper (Fig. 2).
(2) The pressure of the creping process and the thickness of the pressure-bearing belt cannot be standardized.
(3) The lack of incoming materials monitoring measures for crepe paper adhesives, mainly flow rate, solid content and other properties.
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