How to effectively solve the problem of burst angle and burst during the processing of Cosmetic Boxes

How to effectively solve the problem of burst angle and burst during the processing of Cosmetic Boxes

Summary:

The problem of bursting corners and bursting in the process of die-cutting, bonding and packaging of color boxes often plagues many packaging and printing companies. Next, let's take a look at how experienced technicians deal with this type of problem.

The problem of bursting corners and bursting in the process of die-cutting, bonding and packaging of color boxes often plagues many packaging and printing companies. Next, let's take a look at how experienced technicians deal with this type of problem.

　　1, improper pressure causes burst

　　 1.1 There is foreign matter in the bottom plate indentation groove, which causes the pressure to increase sharply during die cutting. This is a common cause of bursting in production, and it is also a destructive cause. It will break the dark thread as a whole and cause the product to be scrapped.

　　1.2 run version, that is, die-cut version or base plate is shifted so that the steel wire falls outside the indentation groove. The bursting caused by this reason is mainly concentrated on the dark line in the same direction, because the cutter or creasing knife is not closely matched with the wooden template, and it is deviated under pressure.

　　1.3 The thickness of the steel wire and the width of the bottom groove of the indentation do not match the paper material. According to the requirements of the die-cutting process, different steel wires should be used for different papers, as well as different thickness of the base plate and different dark line groove widths. If they do not match, it is easy to cause the dark line to burst.

　　2, the burst caused by the die-cutting process

　　2.1 When making the die-cutting plate, the position of the steel wire is improperly handled or there are burrs when the steel wire is cut off. In the die-cutting, if the product has surface treatment, such as laminating. The burrs left on the steel wire during die-cutting will damage the tensile strength of the surface film. When the product is formed, the film cannot be stressed and will burst.

　　2.2 The steel knife wire at the dark line has a knife edge and an interface. Because the interface is not smooth, tearing will occur during die cutting.

　　2.3 When the position of the sponge pad of the crimping knife is not proper, the crimping will occur, and the crimping knife will be deformed and damaged, which will also cause the crimping to burst.

　　2.4 Whether the matching of the knife and thread on the knife mold is reasonable. In particular, the paper thickness was not considered in the design, the knife and the thread could not effectively avoid the overlap, and interference occurred during the molding, which caused the excessive concentration of the force at the place, resulting in bursting.

　　 3. Material quality issues

　　3.1 The water content of the paper is too low, and the paper becomes brittle. This phenomenon occurs more often in winter. Due to the dry and cold winter weather and the low relative humidity in the air, it will directly affect the moisture content of the cardboard, causing the cardboard to break after pressing. Generally, the moisture content of the base paper is controlled at the upper limit (8%). -14%);

　　3.2 The biaxially oriented polypropylene film of the paper-coated material has slight notches, which causes the tensile strength to decrease. Laminating is a relatively common paper surface treatment method. Its main material is BOPP film. If the BOPP film is damaged before die cutting, the BOPP film cannot be stressed and burst when it is bent after die cutting. The bursting of the film only occurs in the film layer. With the addition of the stress points, it will extend along the bursting direction. The bottom paper does not burst, which means that it has nothing to do with the paper. problem.

　　3.3 The paper orientation is wrong. During die-cutting, if the creasing steel wire is perpendicular to the paper fiber direction, and the paper fiber is destroyed radially, the dark line is easy to bend, forming well, and has a small angle; if the creasing steel wire is parallel to the paper fiber direction, the paper is not in the transverse direction. If it is damaged, the dark line is not easy to bend, and it is formed into a rounded corner with a large angle. It has a large support force for the outer layer of the paper and is easy to break. The directionality of the paper has little effect on the die-cutting of sheet-fed paper products. It is just not easy to form, but it is not easy to burst, but it has a greater impact on card-mounted card products. If it is not handled well, it will not only fail to form Well, it is easy to burst lines, mainly because the dark lines with parallel paper patterns burst in different positions, while the lines do not burst in the other direction.

　　3.4 The corrugated configuration is too high. The bursting strength and transverse ring compressive strength of the base paper are one of the influencing factors. If the folding resistance of the inner paper is too low, it will easily lead to bursting.

　　3.5 The mold use time is too long. In die-cutting, the die-cutting plate will loosen after long time use, which will cause the die-cutting tool to bounce up during the die-cutting process, causing the cardboard crimping to burst. Due to the long-term use of the rubber pad, the uneven height of the rubber pad causes the pressure line to burst.

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