Common Problems in Die Cutting And Indentation Processing

Die cutting and indentation processing is an important process in the printing industry. After laminating products, printing is required. Once problems arise, it can cause significant waste.
In die-cutting indentation processing, there are several common problems, such as inaccurate position of die-cutting indentation and uneven cutting edge. How to deal with such problems when encountering them? This article provides a simple analysis.
1, Die cutting indentation position is not accurate
The reasons for the malfunction include: the position does not match the printed product; The cell positions of die-cutting and printing are not aligned; The cardboard mouth has irregular rules; Inconsistent paper feeding position during die cutting operation; The cardboard is deformed or stretched during operation, and the printing is not accurate.
The solution is to recalibrate the template according to product requirements, align the printing and die-cutting positions; Adjust the positioning rules for die-cutting paper feeding to ensure consistent paper feeding positions; Reduce the impact of printing and material defects on the quality of die-cutting in response to the causes of the malfunction.
2, Die cutting edge is not smooth
The reason for this is poor quality of the steel knife, the blade is not sharp, and the die-cutting adaptability is poor; The steel blade edge is severely worn and not replaced in a timely manner; Insufficient machine pressure; When adjusting the pressure of die-cutting, improper handling of the paper pad at the steel knife may cause discomfort in the pressure during die-cutting.
The elimination method is to select steel knives with different quality characteristics based on the different properties of die-cut cardboard, in order to improve its die-cutting suitability; Regularly inspect the cutting edge and wear of the steel knife, and replace it with a new one in a timely manner; Appropriately increase the cutting pressure of the die-cutting machine; Readjust the steel knife pressure and replace the pad paper.
3, Cardboard adhesive blade after die-cutting
The reason is that the rubber filled around the edge of the knife is too thin, causing insufficient rebound force, or the performance of the rubber's hard, medium, and soft properties is not suitable; The steel blade edge is not sharp, and the paper thickness is too thick, causing excessive pressure during clamping or die-cutting.
According to the distribution of steel knives in the template, rubber with different hardness can be reasonably selected, and attention should be paid to the appropriate density and distribution when sticking the plug; Adjust the die-cutting pressure appropriately and replace the steel knife if necessary.
4, Unclear indentation with dark and explosive lines
Dark lines refer to unnecessary indentation, while burst lines refer to cardboard breakage caused by excessive indentation pressure.
The cause of the malfunction is that the thickness calculation of the copper wire pad paper is inaccurate, and the pad paper is too low or too high; Improper selection of copper wire; Improper pressure adjustment of the molding machine, either too high or too low; The paper is too poor, and the water content of the paper is too low, which increases its brittleness and reduces its toughness.
The thickness of steel wire Paper Cuttings shall be recalculated and adjusted; Check if the copper wire selection is appropriate; Adjust the pressure of the die-cutting machine appropriately; Adjust the die-cutting and indentation process conditions according to the condition of the molded cardboard to make them as suitable as possible.
5, Cracking at the creases of the cardboard during folding
When folding, if the outer side of the cardboard indentation cracks, the reason is that the indentation is too deep or the indentation width is not enough; If the inner side of the cardboard cracks, it is due to excessive molding pressure and deep folding.
The thickness of steel wire Paper Cuttings can be appropriately reduced; Widen the indentation line according to the thickness of the cardboard; Reduce the pressure of the floor cutting machine appropriately; Or use copper wire with a slightly lower height.
6, Indentation Line Wood Rules
The reason is that the indentation groove on the copper wire pad paper is left too wide, and the position of the cardboard indentation is uncertain; The thickness of the copper wire pad paper is insufficient, the groove angle is not standardized, excess rounded corners appear, the tightness of the blade arrangement and fixing is not appropriate, the copper coin is too tight, and the bottom cannot be adjusted