Keep the color of corrugated board ink printing consistent and the position accurate

      The main causes of inconsistent printing color depth and plate running are poor control of ink viscosity, unstable ink transfer state, unstable paper feeding state, poor flatness of paperboard, etc. In order to keep the color of corrugated board ink printing consistent and the position accurate, the following points must be achieved:Measures To Improve The Quality Of Corrugated Box Products

1. Keep ink viscosity stable

      Ink viscosity is the main index to be controlled in corrugated board printing. It is one of the main factors affecting the printing color. Due to the volatilization of ink solvent in the printing process, its viscosity will increase. In order to maintain the stability of ink viscosity, ink stabilizer should be added every 0.5 hours to 1 hour, with the addition amount of 1% to 2%.Measures To Improve The Quality Of Corrugated Box Products

2. Keep the ink transfer stable

      Because the printing speed is related to the ink transfer state, the printing speed must be balanced and stable, not fast and slow. It is also necessary to keep a balanced paper pass, and the paper feeding between sheets shall not occur. Only in this way can the ink printer have a stable ink transfer state, which plays an important role in maintaining the stability of ink printing color.Measures To Improve The Quality Of Corrugated Box Products

3. Keep the paper feeding stable

      In addition to the stable running speed of the printing press, the falling point of manual paper feeding shall be fixed. The paperboard with poor flatness shall be properly handled, such as reverse folding along one side (or both sides) of the transverse pressing line of the paperboard; Press by hand, etc. The paper guide clearance should be consistent, which is not only an important link related to maintaining the stable operation of paperboard, but also an important method to solve the phenomenon of “plate running”.Measures To Improve The Quality Of Corrugated Box Products

4. Keep the printing equipment in good condition

      Keeping anilox roller and printing plate clean is directly related to the printing effect. Because anilox roller is related to ink transfer performance, printing plate is related to the clarity of printed words and patterns.Measures To Improve The Quality Of Corrugated Box Products

Improve die cutting accuracy

      With the continuous enrichment of carton printing process and the continuous improvement of processing speed, the problems exposed in die-cutting process are increasing day by day. Reasonable control of waste products in die-cutting process is another main topic to reduce the production cost of corrugated box. The reasons for the inconsistency between the position of die-cutting indentation line and the position of printed products are as follows:Measures To Improve The Quality Of Corrugated Box Products

1. Error of die cutting plate making process

      At present, there are mainly two kinds of die-cutting knife plate making methods: manual plate making and laser plate making. The precision of laser plate making is relatively high. The design and cutting are completed by computer and machinery. It is suitable for die cutting of medium and high-grade packaging. The manual plate making method has high requirements for the technical level of the plate maker.Measures To Improve The Quality Of Corrugated Box Products

      The plate making machine is affected by the technical level and experience of the plate maker and is suitable for medium and short plate packaging with low accuracy requirements. Therefore, in order to get good die-cutting accuracy, we must choose advanced plate making method.Measures To Improve The Quality Of Corrugated Box Products

2. Cardboard has different rules in its mouth

      All die-cutting machines themselves will produce accuracy errors. To improve the accuracy of die-cutting indentation, we must choose a high-precision die-cutting machine. If the specification error of the cardboard jaw is large, it may be that the rear positioning (also known as secondary positioning) toggle distance of the die-cutting machine is too small. It can be solved by adjusting the rear positioning and increasing the rear positioning toggle distance.Measures To Improve The Quality Of Corrugated Box Products

3. Die cutting indentation is not aligned with the printed space

       The solution is to recalibrate the die-cutting plate according to the product requirements, and set the printing and die-cutting indentation grid. In addition, it can also be corrected by adjusting the paper conveying side positioning rules or front positioning rules to align the die-cutting indentation line with the printing grid.Measures To Improve The Quality Of Corrugated Box Products

4. Die cutting indentation and printing work environment are different, resulting in paperboard fiber deformation or stretching

       Try to ensure that the die-cutting indentation and printing are carried out in the same working environment or the same working environment (i.e. the same temperature, humidity, etc.).Measures To Improve The Quality Of Corrugated Box Products

Solve the problem of unclear indentation line

       Unclear indentation line is also one of the main reasons for the decline of corrugated box quality. The main reasons are “dark line” or “explosion line”. The so-called dark line refers to the unnecessary indentation line; The “burst line” refers to the fracture or partial fracture of paperboard fiber due to excessive die-cutting indentation pressure, which exceeds the bearing limit of paperboard fiber. The causes and causes of this fault are as follows:Measures To Improve The Quality Of Corrugated Box Products

1. Improper selection of indentation line and indentation die.Measures To Improve The Quality Of Corrugated Box Products

      The model of the indentation die and the height of the indentation line can be selected as follows. When die cutting corrugated paper:

      Indentation die groove depth = corrugated paper thickness.Measures To Improve The Quality Of Corrugated Box Products

      Groove width of indentation die = 2 times the thickness of corrugated paper + the thickness of indentation line

      The height of the indentation line = the height of the die-cutting knife – the real-time paper thickness of the corrugated paper

2. Improper pressure adjustment of molding machine.Measures To Improve The Quality Of Corrugated Box Products

       The pressure regulating mechanism of the die-cutting machine shall be adjusted to properly adjust the pressure of the die-cutting machine.

3. The thickness of the adhesive paper of the fixed backing plate is not accurate.Measures To Improve The Quality Of Corrugated Box Products

      Because the paper pad is too low or too high, the adjustment method is to re pad the paper.Measures To Improve The Quality Of Corrugated Box Products

4. The paper is too poor or the water content of the paper is too low

      The increase of paper brittleness and the decrease of toughness will also produce wire burst, which can be solved by increasing the ambient temperature