At present, color printing packaging is a kind of packaging products that can be seen everywhere on the market. It is convenient to use and cheap. In addition to the quality of the packaging itself, the printing color is also an important inspection indicator. For a qualified packaging product, the color must not be distorted, so as to ensure the use effect. Here is how to judge whether it is distorted.
1、 Neutral color benchmark method: there are many neutral colors in life, such as black, white, gray, etc. They are the zero point of color in the colorful world, and we can use them as the basis to identify the color distortion of color printing packaging.
2、 Skin color benchmark method: if the color of the people in the color printing packaging image is yellow, it will give people a morbid feeling. Under normal circumstances, even if the skin color of the person in the image is really yellow, it should be adjusted to blood color during color correction, that is, there is red in yellow.
3、 Impression benchmark method: human eyes have certain adaptability to color. For images with slight color distortion, repeated observation will weaken the recognition ability.
The above three methods can directly judge whether the printing color of the color printing package is distorted, and can be used as a reference in the actual application process. If you need to further investigate the distortion, you need to use some more sensitive color instruments for chromatographic analysis. So you can choose the appropriate method to judge the color according to the actual needs.
Color printing packaging is a kind of packaging products that we often use, and its production specifications are diverse. Sometimes, in the process of manual operation or transportation, the bursting phenomenon may occur for various reasons. Once the bursting occurs, it will affect the integrity of the packaging products, resulting in the inability to continue to use. Here is an analysis of the reasons for the bursting phenomenon.
1. Improper pressure causes bursting of color printing package
(1) There is foreign matter in the indentation groove of the bottom plate, which causes the pressure to increase sharply during die cutting. In production, this is a common cause of bursting and also a destructive cause. It will break the concealed line as a whole, resulting in product scrapping.
(2) Running plate, that is, the die cutting plate or the bottom plate is displaced, so that the steel wire falls on the outside of the indentation groove. The burst caused by this reason is mainly concentrated on the dark line in the same direction, because the cutter or indentation knife is not closely matched with the wood template, which deflects under pressure.
(3) The selection of steel wire thickness and indentation bottom groove width does not match the paper material. According to the requirements of the die-cutting process, different steel wires should be selected for different papers, as well as different thickness of the bottom plate and different width of the dark line slot. If they do not match, it is easy to cause the dark line to burst.
2. Color printing package burst due to die cutting plate production process
(1) When making the die cutting plate, the position of the steel wire is improperly handled or there are burrs left when the steel wire is cut off. If the packaging has been surface treated, such as film covering. Burrs left on the steel wire during die cutting will damage the tensile strength of the surface film. When the film is not stressed during product forming, it will burst.
(2) The steel knife steel wire at the concealed line has a knife edge and an interface. Tearing will occur during die cutting due to unsmooth interface.
(3) When the sponge pad of the crimping knife is not properly positioned, the crimping will burst. Deformation and damage of the crimping knife will also cause the crimping burst.
(4) Whether the matching of knife and thread on the knife die is reasonable. In particular, the thickness of the paper was not considered in the design, and the overlap between the knife and the line could not be reasonably avoided. The interference occurred during the molding, which caused excessive concentration of force at this place and burst.
The above is the reason for the burst phenomenon of the color printing package. In the process of production and processing, we should pay attention to mastering the correct production methods. To prevent the burst phenomenon, we need to find the reason from the process itself. We should do a good job in controlling the steel wire treatment and the film thickness in the production process, so that we can prevent the burst phenomenon.
