Common Problems in Rotary Die-Cuting and Its Solution (Part One)

1. The liner is thinner than the design requirements;
2, die cutting edge is too low;
3, flexible die-cut wear;
4, die cutting system is not suitable.
Key points: You can check with a 10-15um thick film.

Problem 2: Die cuts in the circumferential direction and in the axial direction of the magnetic die-cutting roll are not uniform, and occur simultaneously in both directions.
The reason for this problem is:
1. The manufacturing precision of the flexible die-cutting plate is inconsistent. In order to check this point, the roller should be turned over 180 degrees before die-cutting. If this condition still occurs, it proves to be bad;
2. If the die-cutting drum is turned over 180 degrees and then die-cut, this situation occurs only in one direction, indicating that the die-cutting knife in this direction is worn out;
3, the bearing gap is too large;
4, the transmission wheel is too large (usually a transmission wheel is too large or wrong gear mesh angle)
Requirements: Check with a 10-15um thick film.

Question 3: There are several rows of die cut too deep.
1. If you are always die-cutting in a certain row, it is because:
Dust falls between the flexible die plate and the magnetic roller (open inspection);
There is a bit of error in the manufacture of flexible molds.
2. If it occurs indefinitely in several rows, it is because there is dust or adhesive on the anvil roller.

Question 4: When the cylinders are die-cut upwards and downwards, they are strong and weak.
· If it always occurs in the weekly direction, it is because:
1. The flexible die-cutting plate is mismanufactured (the flexible die-cut plate is fixed after being rotated by 1/3 circle from the original place, and the mark is marked and the die-cutting is started. If the problem occurs in the corresponding new position after the move, it is the reason);
2, magnetic roller and roller reducer.
• If the problem does not occur regularly with the rotation of the drum, it is because:
1, the anvil roller is in;
2. The support of the anvil roller is not correct;
3, the pressure roller drum is damaged.

Question 5: Die cutting in the middle of the drum is poor.
1. This problem occurs in an unsupported system of the anvil drum, and when the pressure is large, if the ratio of the length of the drum to the perimeter is less than 1:1, it is due to the depression of the shaft of the anvil roller.
2. This problem occurs in a system with a pressure roller, and when the pressure is high, if the ratio of the length of the roller to the circumference is less than 1:1, it is caused by the depression in the middle of the axis of the magnetic drum.
3. If this problem occurs in a system in which the affixing cylinder is combined with another cylinder, and the ratio of the length of the cylinder to the circumference is less than 1:1, the dynamic load causes the depression of the pressure roller to be deformed.

Problem 6: The die cutter wears too fast.
In addition to the wear resistance of the material, there are many reasons that cause the die cutter to wear too quickly, such as:
1. For the material, the die cutting angle is too steep;
2. The material of the flexible die cutter is too soft;
3, die-cut to the more wear-resistant ink (such as opaque white ink, metal ink and fluorescent ink), encountered this problem can contact the ink manufacturer;
4, the bearing gap is too large;
5, drum circumference is not correct;
6, magnetic drum, die-cutting drum and anvil drum size is too small;
7, the frame size is too small or die-cylinder pressure is long. (To be continued)