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Common problems and functions of die-cutting indentation in the printing industry(2)

Views: 76     Author: Site Editor     Publish Time: 2021-07-16      Origin: Site

1. Common indentation problems

Fully automatic horizontal die-cutting machine, the principle of paper feeding and delivery is similar to that of offset printing machine. The faults are not analyzed here. The following is only an analysis of common problems in the die-cutting part.

Automatic Binding Machine

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-plate installation-pad plate-boot-finishing-finished product. In the manufacturing process of folding carton, the line mark is a controlled deformation on the cardboard. The principle of indentation is that the cardboard presses the board between two fixed surfaces. The internal fiber structure of the paper is destroyed, causing the paper to be partially layered and forming concave and convex lines on the outside. When the indented cardboard is folded at ninety degrees or one hundred and eighty degrees, the fiber bonds inside the paper are completely separated.

In the process of indentation, the pressure is uneven, there are generally two situations: one is slight unevenness. If the pressure is slightly uneven, it may be due to the uneven distribution of the die-cutting knives, which causes the moving platform to be skewed during die-cutting. At this time, a balanced knife line should be installed on the die-cutting plate to make the platform evenly stressed. It may also be affected by the direction of the paper fibers. When the paper is perpendicular to the cutting line, the indentation effect is ideal. The other is serious unevenness. If serious pressure unevenness occurs at the four corners of the front and rear of the platform, it is mainly caused by the inconsistent height of the four connecting rods supporting the movable platform. 

At this time, the protective cover of the die cutting base should be opened to check whether the pendulum rod is worn or not. If the wear is serious, it needs to be replaced, otherwise the four pressure adjustment ramps need to be adjusted until the pressure is consistent.

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