1. Some materials, such as glossy paper (also known as mirror coated paper), have short fibers and are relatively fragile. During the die-cutting and waste disposal process, the tensile strength of the waste disposal edge is lower than the waste disposal tension of the equipment, making it easy to break.
If such situations , it is necessary to minimize the waste discharge tension of the equipment as much as possible. If the waste tension of the equipment has been adjusted to the lowest level but still cannot solve the problem, then it is necessary to design the waste edge wider in the early process design to ensure that the waste edge fracture will not occur frequently during the die-cutting process.
The amount of adhesive applied in the adhesive material has a significant impact on the die-cutting performance of the adhesive material. Generally, on die-cutting equipment, the adhesive material is not immediately discharged after die-cutting, but needs to continue to be transported forward for a certain distance until it reaches the discharge station before starting to discharge. If the adhesive is applied too thick, during the transfer process from the die-cutting station to the waste discharge station, the adhesive will flow back, causing the cut adhesive surface material to stick together again, causing the waste discharge edge to break due to adhesion when pulled up.
When encountering such problems, one can first observe whether there is a serious wire drawing phenomenon between the waste edge and the label. If the wire drawing phenomenon is severe, it indicates that the adhesive has a large amount of coating or strong flowability. This problem can be solved by applying some silicone oil additives to the die cutting knife or heating it with an electric heating rod. Silicone oil additives can effectively slow down the speed of adhesive reflux, while heating the adhesive material can quickly soften the adhesive, thereby reducing the degree of wire drawing.
3. Die-cutting knives with defects can also easily cause the waste edge to break. For example, small notches on the edge of the knife can cause the adhesive surface material to not be completely cut, and the uncut part is more concentrated in force compared to other parts, making it easy to break. This phenomenon is relatively easy to determine because the location of the fracture is fixed. In such cases, it is necessary to repair the damaged knife mold before using it for die-cutting.
