Every Die-hard Die-cutting Die--All Solutions to Die-cutting Problems (2)

A steel knife is a shearing process, while a copper wire or a steel mold acts as a pressure deformer on the paperboard: elastic rubber strips (or sponges) are used to make the finished product or waste easily separated from the cutting edge. The pad plate acts like a chopping block.

Failure analysis and analysis

In the die-cut indentation process, a series of problems often occur, affecting the smooth progress of production. On the basis of introducing the principle of die-cutting process, the common problems encountered in the production of die-cutting indentations are further analyzed and the solutions are discussed. Hope to help the actual production of carton enterprises.

1 Die cutting accuracy is not high

Deviations in die cutting are the most common problems in production. Die-cutting accuracy is one of the most important standards for measuring die-cutting quality and is an important guarantee for qualified products. There are many reasons that affect die-cutting accuracy, such as mechanical reasons, problems with die-cutting, and problems with prints, work environment, and personnel operations. Different problems have different solutions, which are analyzed here.

â–  In the cardboard conveying process, the main drive chain is worn and elongated, which will directly affect the positioning accuracy before die cutting. At this time, the die-cutting operation in Figure 4 is required to replace the chain. The wear of the intermittent mechanism causes the teeth to fluctuate during stoppage or start-up, which can also affect die-cutting accuracy. In this case, only the positioning accuracy is generally affected. At this time, the mechanism should be overhauled.

â–  The positioning distance of the front and rear positioning swing frames is too small. Because the length of the chain itself has a certain error, if the positioning distance is too small, the chain error cannot be eliminated in the front and rear positioning, thereby affecting the precision of die cutting. At this time, the position of the adjustment screw of the front positioning pendulum or the position of the cam of the rear positioning pendulum should be adjusted so that the distance between the front and rear positioning racks can be adjusted to 2 mm to 3 mm.

â–  The positioning of the upper die cut or lower die cut is inaccurate. Long-term use of the machine can cause wear of the positioning block on the die-cut frame or die-cut base plate, resulting in excessive fit clearance and resulting in reduced die-cutting accuracy. The positioning block should be replaced at this time. The wear of the side positioning plate is an important factor that causes the side to be misaligned. Since the amount of toggle of the positioning is not sufficient to compensate for the good wear, the positioning accuracy on the side may be deteriorated. At this point should replace the side positioning plate

â–  The gripper pressure is too small or uneven. If the elasticity of the movable teeth of the grippers becomes smaller due to long-term use, it will cause the paper to slip or fall off during the transfer, which will directly affect the precision of die-cutting; uneven pressure between the grippers may cause the paper to die-cut. Skewness in the process. At this point should replace the active teeth. In addition, the fixed teeth should also be the same in the level, otherwise it may also produce paper collision or crease after paper crepe, affecting the die-cutting accuracy;

(to be continued)