Due to the long-term use and wear of the die-cutting machine, the tooth bar chain is somewhat loose and elongated. During the die-cutting process, when the chain drags the tooth bar outward, it cannot be stretched straight. The paper bounced off by the sponge rubber strip presses on the die-cutting base plate, which is prone to tearing and eventually causes the plate to fall apart.
During the die-cutting production process of paper boxes, excessive packaging often encounters the problem of loose plates, that is, the paper box and the waste edge come apart, causing the paper to flow unsmoothly during the die-cutting process. This is a very headache-inducing issue for the operators. Some solutions have been summarized in actual production for your reference.
1. Remove obstacles
The cause of the loose plate may be that there are tiny and hard-to-detect foreign objects on the paper path, especially when there are obstacles in the newly pasted creasing die. At this time, special attention should be paid to checking whether the creasing die seam is smooth, and whether there are sharp corners and burrs. These minor problems will affect the normal movement of the paper. The operator can use a sharp blade to flatten the edge of the indentation die or sandpaper to smooth it out, and then stick transparent tape along the edge.
2.add connection points
When designing paper boxes, designers usually set connection points at the corresponding positions of the paper box's subsistence. However, in general, to avoid affecting the appearance of the paper box and facilitate waste removal (manual paper stripping), the connection points are designed to be relatively few and small. If there is a problem of loose plates during die-cutting, the operator can add connection points at the paper box's subsistence and the dust-proof flap.
3. Select the appropriate sponge rubber strip
If the sponge rubber strip filled between the die-cutting knife plate and the knife line is too soft and cannot smoothly spring up the paper, it will also cause the plate to fall apart. Sponge rubber strips of moderate hardness should be selected.
4. Reduce stress
The setting of plate mounting pressure is particularly important. When setting the pressure, gradually increase it from small to large. Do not press through the entire plate at once. It is sufficient to ensure that 80% to 90% of the printed matter can be pressed through. For other areas that cannot be pressed through, you can place some paper strips or stick some adhesive tape on them. After the die-cutting machine has been running for several hours, the overall pressure should be reduced. This is because as the oil temperature rises after the die-cutting machine has been running for a period of time, the pressure will gradually increase.
5. Paper humidification
If the moisture content of the paper is low and the paper is relatively brittle, it is also easy to cause the die-cutting plate to come apart. Especially for the paper that has just undergone the varnishing process, the plate is more likely to come apart during die-cutting. At this time, the finished product after varnishing should be humidified or die-cut again the next day.
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