Changes in the paper's stretching caused the layout specifications to be inaccurate. If the stability of the paper is poor, the moisture content in the printing process will change significantly. After many processing processes, due to heat or moisture absorption, the paperboard will undergo a change in flexibility. In such a case, the position of the layout of the printed product will be deviated when die-cutting is performed. In actual production, try to avoid the use of freshly produced paper. Freshly produced paper should be stored for a period of time to ensure that it is in balance with the printing conditions and then put into action, so that its deformation coefficient is relatively small. For products with high requirements for accuracy, the deformation factor in each process should be fully considered, and the layout position should be adjusted as appropriate during the print imposition. In addition, it is also necessary to control the temperature and humidity of the raw paper warehouses, production workshops, and production processes, and there should be no significant disparity between the levels to ensure the accuracy of the positions and specifications of die-cutting indentations.
Changes in the thickness of the paperboard will affect the position of the finished plate after die-cutting and indentation. In particular, after the corrugated cardboard is applied, due to the increase in its thickness, the position of the product after the die-cutting and indentation is formed will also have a bias error. When printing the imposition, consideration should be given to the position where the product should be placed after the product has been folded by increasing the thickness.
Obvious warping of the cardboard can result in inaccurate positioning. When the corrugated cardboard warped after printing and other processes enters the die-cutting machine for die-cutting, the surface of the cardboard is not in uniform contact with the die-cut plate, so that the raised cardboard surface is first brought into contact with the rubber strip or sponge on the plate surface. Causes the board to slip, resulting in inaccurate die cutting. Maintaining good flatness of paperboard is an important part of improving the precision of paperboard cutting. Control the matching production of corrugated paper and boxboard paper with similar moisture content; control the speed and temperature of single-sided machine, and prevent the impact of corrugated board from warping to affect the die-cutting accuracy of the product.
The stencil of the paper and the paper cannot be allowed to cause die-cutting positioning errors. If two layers of cardboard with printing surface and non-printing surface are not accurately affixed, the non-printing surface of the paper will protrude beyond the edge of the printing surface, which will inevitably result in the positioning error of the cardboard. Inadvertently inadvertently inadvertently appears in the process of adhering, in order to prevent the non-printing surface of the adhering non-printing surface from appearing convex appearance, when printing, it is necessary to according to the characteristics of the product, the semi-finished product will be printed with the side gauge and the former Adding 3mm~6mm edge trim margin. By properly shrinking the non-printing side of the paper edge inward by a few millimeters, it can effectively prevent the convex side of the non-printing side from appearing convex and ensure that the product is die-cut accurately.
Poor machine causes incorrect die positioning. If some parts of the die cutting machine are worn or loose, it is easy to cause inaccurate positioning of the cardboard die. Before the production, the machine should be observed and inspected carefully, and corresponding measures should be taken to deal with the existing unfavorable conditions to ensure that the product is die-cut accurately.
The looseness and deformation of the die-cutting indentation plate result in inaccurate layout position and specifications. Due to the pressure of die-cutting indentation, if the size of the layout is too large and the version of the plate is not used, the installation of the plate is not very firm and the die-cut plate will move along the lateral position of the platen. Due to the huge pressure, the die-cut version may make the plate core solid, and the steel blade is also prone to bending and other unfavorable conditions. It will also make the die-cut version specifications change, affecting the die-cutting accuracy of the product. During the production process, attention should be paid to careful observation and inspection, and if problems are found, measures must be taken to correct them.
Excessive thickness of the rubber strip or sponge results in inaccurate die cutting. The role of the rubber strips and sponges is to use elasticity to quickly separate and shed the die-cut semi-finished products and scraps from the die-cut plate to achieve a continuous, normal die-cutting process. In general, the rubber strip is suitable for the knife edge 3mm–5mm, and the sponge piece is more than the knife edge, and should be reasonably controlled according to the characteristics of the product in order to achieve better results. During production, it must be noted that the flatness of the cardboard is not good, and the rubber strips or sponges are too thick. When the pressure is combined, the rubber strips and the sponges are likely to rub against the warped paper surface first, causing the displacement of the printed sheets to cause die-cutting inaccuracies.
Mistaking the direction of the paper pattern results in inaccurate die-cutting marks. One direction on the vertical and horizontal planes is generally composed of a plurality of small joints. If the horizontally stretched sheet of paper that is most prone to stretching changes is used to print a layout in the direction of multiple impositions, it is likely to result in inaccurate die cutting.
