The corners of the color box are rotten, and the professional name is the explosion of the color box and the explosion of the edge of the color box. There are many reasons for the rotten corners of the color box. Today, I will take you to learn more about the reasons for the broken edges of the color box. Let's take a look.

1. Improper pressure leads to burst

1. There are foreign objects in the indentation groove of the bottom plate, which causes the pressure to increase sharply during die cutting. This is a common cause of bursting in production, as well as a destructive one. It will crack the dark line as a whole and cause the product to be useless.

2. Running the version, that is, the die-cutting version or the bottom version, so that the steel wire falls outside the indentation groove. The bursts caused by this reason are mainly concentrated on the dark lines in the same direction, because the cutter or indentation knife does not work closely with the wooden formwork and is deflected under pressure.

3. The selection of the thickness of the steel wire and the width of the bottom groove of the indentation does not match the raw material of the paper. According to the requirements of the die-cutting process, different steel wires should be used for different papers, as well as plates of different thicknesses and different groove widths of the dark lines. If they do not match, it is easy to cause the dark lines to burst.

2. Burst caused by die-cutting plate manufacturing process

1. The orientation of the steel wire is not handled properly when the die-cutting plate is manufactured or the burr is left when the steel wire is cut off. In die cutting, if the product has surface treatment, such as lamination. The burrs left on the steel wire during die cutting will damage the tensile strength of the outer film, and the film will burst when the product cannot be stressed when the product is formed.

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

3. The choice of the thickness of the steel wire and the width of the bottom groove of the indentation does not match the raw material of the paper. According to the requirements of the die-cutting process, different steel wires should be used for different paper sheets and sheets with different thicknesses and different deep groove widths. If it does not match, it is easy to cause the dark line to burst.

2. Burst caused by die-cutting plate manufacturing process

1. When the die-cutting board is made, the direction of the steel wire is not handled properly or the burr is left when the steel wire is cut. In die cutting, if the product has a surface treatment such as lamination. The burrs left on the steel wire during die cutting will destroy the tensile strength of the outer film, and the film will burst when the product cannot be subjected to force during molding.

2. The steel wire of the steel knife at the dark line has a knife edge and an interface. Since the interface is not smooth, there will be tearing during die cutting.

3. Improper position of the sponge pad of the crimping knife will cause the crimping line to burst, and the crimping knife will be deformed or damaged, which will also cause the crimping line to burst.

4. Is the knife line on the mold reasonable? In particular, the thickness of the paper is not considered in the design, and the knife and line cannot be effectively avoided when overlapping, and interference occurs during molding, resulting in excessive force concentration and bursting.

3. Material quality problems

1. The moisture content of the paper is too low, and the paper becomes brittle. This phenomenon is more common in winter, because the weather in winter is dry and cold, and the relative humidity in the air is low, which will directly affect the moisture content of the cardboard. -14%);

2. The biaxially oriented polypropylene film of the paper coating material has a slight gap, which leads to a decrease in tensile strength. Lamination is a relatively common paper surface treatment method. Its main material is BOPP film. If the BOPP film is broken before die cutting, it will cause the BOPP film to burst after being bent after die cutting. The bursting of the membrane occurs only in the membrane layer. With the increase of the force point, it will extend along the blasting direction, and the bottom layer of the paper will not burst, that is, it has nothing to do with the paper. question.

3. The orientation of the paper is wrong. During die cutting, if the direction of the indentation steel wire and the paper fiber is straight, and the paper fiber is radially damaged, the dark line is simply tortuous, the forming is good, and the viewing point is small; if the indentation steel wire is parallel to the paper fiber direction, the paper is not horizontal, if Damaged, dark lines are not easy to bend, rounded corners are formed, the viewpoint is large, and the outer layer of paper has a large supporting force and is easy to break. This directionality of the paper has little effect on the die-cutting of single-sheet paper products, but the formability is not good, but it is not easy to burst, but it has a greater impact on card-mounted card products. If the processing is not good, not only the molding is not good enough, but also the lines are easy to burst, mainly because the dark lines of the parallel paper pattern burst in different directions, but not in other directions.

4. The corrugated equipment is too high. The burst strength and transverse compressive strength of the base paper are one of the influencing factors. If the flex resistance of the inner liner is too low, it can easily lead to bursting.

5. The mold has been used for too long. When the die-cutting board is used for a long time in the die-cutting process, the crimping knife will be loose, which will cause the crimping knife to bounce up during the die-cutting process, causing the edge of the cardboard to burst. Due to the long-term use of the rubber pad, the unevenness of the rubber pad causes The pressure line burst.

The above is the explanation of the reasons for the explosion of the color box. After reading it, do you understand it? I hope it will be helpful to everyone.