Color box in the process of die-cutting, bonding and packaging, burst angle, burst problems often plague many packaging and printing companies. Next, let's take a look at how senior technicians deal with such problems.
1. Improper pressure causes burst
1.1 There are foreign objects in the indentation groove of the bottom plate, which causes a sharp increase in pressure during die cutting. This is a common cause of bursting in production and is also a destructive cause. It will break the dark line as a whole and cause the product to be scrapped.
1.2 The running version, that is, the die-cut version or the bottom version, makes the steel line fall outside the indentation groove. The burst caused by this reason is mainly concentrated on the dark line in the same direction, because the cutter or the indentation knife does not cooperate closely with the wooden formwork, and it deflects under pressure.
1.3 The selection of the thickness of the steel wire and the width of the bottom groove of the indentation does not match the paper material. According to the requirements of the die-cutting process, different steel wires should be used for different papers, as well as different thicknesses of base plates and different widths of dark wire grooves. If they do not match, it is easy to cause dark wire burst.
2. Burst caused by die-cutting plate production process
2.1 Improper handling of the position of the steel wire when making the die-cut version or burrs when the steel wire is cut off. If the product has been surface-treated during die cutting, for example, covered with film. The burrs left on the steel wire during die cutting will damage the tensile strength of the surface film, and the film will not burst when the product is molded, and it will burst.
2.2 Steel knife at the dark line The steel wire has a knife edge and an interface. Due to the unevenness of the interface, tearing will occur during die cutting.
2.3 When the sponge pad of the crimping knife is improperly positioned, the crimping burst phenomenon will occur, and the deformation and damage of the crimping cutter will also cause the crimping burst.
2.4 Whether the combination of knife and thread on the knife mold is reasonable. Especially in the design, the thickness of the paper is not taken into consideration, the knife and the line cannot be effectively avoided in the overlap, and interference occurs during the molding, so that the force is excessively concentrated there and a burst occurs.
3. Material quality issues
3.1 The moisture content of the paper is too low, the paper becomes brittle. This phenomenon occurs more frequently in winter. Due to the cold and dry weather in winter, the relative humidity in the air is low, which will directly affect the moisture content of the cardboard, causing the cardboard to break after crimping. Between -14%);
3.2 The biaxially oriented polypropylene film of the paper coating material has a slight gap, which causes a decrease in the tensile strength. Laminating is a relatively common method of surface treatment of paper. The main material is BOPP film. If the BOPP film is damaged before die cutting, it will cause the BOPP film to be forced to cause bursting after bending after die cutting. The bursting of the film only occurs in the film layer, and it will extend along the bursting direction with the addition of the force point. The bottom paper does not burst, which means that it has nothing to do with the paper. problem.
3.3 The paper direction is wrong. During die cutting, if the indentation steel wire is perpendicular to the paper fiber direction, and the paper fiber is damaged radially, the dark line is easy to bend, the shape is good, and the angle is small; if the indentation steel wire is parallel to the paper fiber direction, the paper is not in the transverse direction When damaged, the dark lines are not easy to bend, and are formed into rounded corners with large angles. They have a large supporting force on the outer layer of the paper and are easily broken. The directionality of the paper has little effect on the die-cutting of single-sheet paper products, but the forming is not good, but it is not easy to burst the line, but it has a greater impact on the card-mounted card products. Well, it is also easy to burst the line, mainly because the dark lines of parallel paper lines burst at different positions, but the other direction does not burst.
3.4 The corrugated configuration is too high. The bursting strength and transverse compressive strength of the base paper are one of the influencing factors. If the fold resistance of the inner paper is too low, it may easily cause burst.
3.5 The mold is used for too long. In the die-cutting, the die-cutting plate will loosen after a long period of use, causing the die-cutting tool to bounce during the die-cutting process, causing the cardboard crimping line to burst. Due to the long-term use of the rubber pad, the unevenness of the rubber pad causes the pressure line to burst.
