Views: 71 Author: Site Editor Publish Time: 2021-08-27 Origin: Site
In addition, when die-cutting hard packs of cigarettes, due to the close distance between the indentation lines in many positions, if the height of the indentation steel wire is configured according to the normal situation, the tension on the paper during the molding will be too large, which will also cause "explosion". line". Therefore, we should try to minimize the tension on the paper by:
One is to reduce the height of the indentation steel wire; the other is to reduce the thickness of the indentation bottom die strip, but the two cannot be used at the same time, otherwise a good indentation effect will not be achieved.
A better method is to reduce the height of the indentation steel wire. The lowered height is usually 0.1～0.2mm, which should be determined according to the basis weight of the paper. The height of the indentation steel wire that needs to be reduced for paper with a basis weight of 350g/㎡ is 0.2mm. , Paper with a basis weight below 350g/㎡ should be reduced by 0.1mm.
Reason: The indentation steel wire twists under the action of die cutting pressure, which will cause the indentation line to run out; insufficient die cutting pressure will cause the indentation line to be not full.
Measures: Replace the die-cutting plate and increase the die-cutting pressure.
Reason: During die-cutting, the cutting edges of the die-cut products are often not smooth and fluffy, especially at some cutting edges closer to the indentation line. This is because the rubber strips and indented steel wires on the die-cutting plate exert a tensile force on the paper when the die-cutting and pressing are performed, and the paper is broken by the generated tensile force when it is not completely cut through, and burrs appear.
Measures: First, choose different types of die cutters according to the paper. Die-cutting knives include straight-grain knives and horizontal-grain knives. The blades of the two kinds of patterns are different in height. The patterns and heights formed by the blades are different, which are directly related to the quality of die-cutting and the service life of die-cutting knives. Straight-grain knives are better than cross-grain knives in avoiding die-cutting fuzzing; in terms of service life, short-blade knives are better than high-blade knives.
When die-cutting film-coated cardboard, you should choose a straight-grained high-blade knife, and the blade should be ground. It is best not to use a one-time press-concave-convex molding process, otherwise too much pressure will have a great impact on die cutting; For ordinary paper jams, a short blade should be used, and the texture of the blade should be determined according to the quality of the paper fiber.
