Each Other's Own Punctuation - The Whole Solution to Die-cutting Problems (3)

The above-mentioned points are mainly mechanical factors. The operation and maintenance personnel are required to perform maintenance on the machine, check and inspect the components in time, and replace the worn-out parts to ensure the best state of the die-cutting machine.

â–  Platemaking issues. If there are problems in the process of designing the plate, you should choose advanced plate-making methods to improve the accuracy of the die-cutting plates; or correct the plates, mainly the position of printing and die-cutting should be aligned. Hand-made plates are prone to deviations, which may cause the position of the printing to be inconsistent with the position of the die-cutting. If necessary, it is necessary to re-make the template.

■ The impact of the environment. The main reason is that the paperboard is deformed or stretched, resulting in inaccurate “overprinting” and affecting the accuracy of die cutting. Try to ensure that the die-cut indentation is printed under the same operating environment or the operating environment is the same (the same temperature, humidity, etc.). The pre-treatment of die-cutting for coated and coated sheets shall be done to minimize the influence of the precision of the paper-cutting and Liu Die-cutting. Appropriate paper should be used to reduce the impact of material defects on die-cutting accuracy

â–  The influence of the operator. This includes an entire production process from plate making to die cutting, requiring operators to strictly follow the process flow, increase production management requirements, and provide professional skills training for operators when necessary.

2 Die-cutting and pasting

The so-called loose version refers to the fact that the waste edge and the cardboard are scattered when die-cutting and the paper-feeding is not smooth. Severe dispersion will affect die-cutting and board transport, which will affect normal production. The main cause of the scattered version is the mistakes in the die-cutting platemaking process and the choice of elastic strips (or sponges); at the same time, other factors may also cause scattering. Die-cut "glue" refers to the fact that the cardboard is stuck on the die-cut plate and cannot be separated in time.

â–  Reasons for making a plate. When making a die-cut version, there are too many jobs arranged on a product with a complex shape or on the same plate, and the connecting points set in the die-cutting are very small and few, and it is very easy to cause the die-cutting. In this case, the number of connected points should be increased appropriately. The length of the job should be consistent with the direction of transport of the cardboard. If the elastic strip (or sponge) on the die-cut is too soft, it will not bounce off the cardboard smoothly, and it will also cause loose printing. At this point should use high hardness, elastic good quality elastic tape (or sponge);

â–  Flat die cutting. The premature start of pressure stripping is also an important cause of the scattered version. After die cutting, when the movable platform descends, although the paper has been ejected from the knife line by the elastic rubber strip (sponge), since the elastic rubber strip (sponge) is generally 2 mm-3 mm higher than the cutting line, if the gripper row starts at this time Movement, because the elastic rubber strip (sponge) still presses the paperboard on the die-cutting bottom plate and is easily torn, resulting in a loose plate. At this point should be released Sicha institutions and the main chain axle joint set to adjust, so that the dynamic platform from the top dead center drop 10mm ~ 15mm (paper cutting die control at 7mm-8mm or so), the pressure row began to move;

â–  Problems with materials. If the paperboard is poor in paper quality and the fibers are too short, it may be disintegrated during die-cutting. Can properly reduce the cutting speed, in the plate-making should pay attention to increase the number of points, resulting in paste version is mainly due to the plastic tape around the die cutter blade is too thin or too small hardness, lack of resilience; die cutting edge is not sharp , The paper is too thick, causing the knife to stick when cutting or cutting. According to the distribution of die cutters, sponge strips with different hardness can be selected and their positions can be reasonably arranged or die cutters can be replaced.

3 The edges are not smooth and fluffy when cutting

The main reason for this phenomenon is related to the quality of the steel knife and the die cutting pressure. There are mainly the following situations, which can be solved according to the actual situation.

â–  The quality of the steel knife is poor, the cutting edge is not sharp, and the die cutting adaptability is poor. This is an important cause of the edge being not smooth or fluffy. According to the different properties of die-cut printing crystals, steel knife can be used to improve the die-cutting adaptability. There is no special requirement; under the condition, steel bars treated with stripes are selected as much as possible;

â–  The sharp edge of the steel blade is worn out and has not been replaced in time. Frequently inspect the wear condition of the cutting edge of the steel blade. When it is found that wear and even affects the quality of die-cutting, replace the new steel knife in time;

â–  When the die-cutting pressure is adjusted, improper handling of the paper at the steel knives will result in discomfort in the die-cutting pressure and a phenomenon that the cutting edge is not smooth or fluffy. The die-cutting pressure can be readjusted and the pad can be changed so that the pressure meets the die-cutting requirements. When changing the steel knife, it is also necessary to pay attention to timely replacing the pad.

Die-cutting is not made properly. The matching and installation of die cutters and elastic rubber strips (or sponges) are not standardized and can also cause the above phenomenon. The elasticity of the elastic strip (or sponge) should be suitable. Different products should use elastic strips (or sponges) with different hardness. At the same time, the location and height of the strip must also meet the specifications.

â–  The edge is not smooth or fluffing, but also related to the flatness of the bottom steel plate and the pressure of the machine. The bottom plate must be flat and replace the bottom plate if necessary.

(to be continued)