Four ways to print corrugated paper with water-based ink
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At present, there are four production methods for the water-based ink printing equipment in the corrugated box industry, and their characteristics are different.
The first is the chain-type single-machine printing method, which can only be printed without slotting and die-cutting.
The second is the commonly used production method of printing slotting and round die cutting. This method uses upper ink printing. After slotting or die cutting, it can be formed by only bonding (nail box).
The third is the use of fully automatic printing slotting, folding bonding (nail box) production method, this machine is a folding molding and the use of the lower ink printing system, is a one-time molding machine.
The fourth type is the more advanced printing and round die-cutting method. It is characterized by multi-color printing, high precision equipment, and printed products can achieve color printing effects, especially suitable for color carton sales. package. The common characteristics of the above several production methods are ink printing. The printing principle and equipment structure are basically the same, but the printing color, the number of mesh lines and the process equipment are different. The printing process is affected and restricted by many aspects and factors. Many problems can be solved without simple adjustments by the operator. Only through all aspects of cooperation, to minimize and avoid some unnecessary problems in the production process.
This article analyzes the common problems that are easy or often occurring in ink printing and takes the necessary measures accordingly.
1. Slotting knife and longitudinal pressure line are not accurate, resulting in inaccurate printing position
Analysis of the reason: Due to the size adjustment of the slotting and pressing line not required by the technical drawings, the manufacturing length of the cardboard length or width is deviated, which ultimately affects the printing position.
Solution: Firstly, adjust the slotting or pressing line size according to the manufacturing dimensions of the drawing, and require the position to be accurate, then re-adjust the position of the printing plate according to the exact size position, and check the deviation of the slotting or the pressure roller due to wear.
2. The position of the printing plate is not allowed, causing the plate to be re-adjusted.
Analysis of the reason: Due to the unclear labeling of the color registration and the partial printing plate, the error in the typesetting is large, and the printing position is obviously deviated in actual production. The current printing equipment is basically drum printing, and the typesetting is on the plane, which will inevitably cause longitudinal positional errors, and the shrinkage rate problem arises due to the size of the printing pressure.
Solution: First, when making a 1:1 ink map, it should be drawn at the normal percentage reduction rate. When printing, strictly adjust the printing plate according to the ink position. When the color registration accuracy is very high, the “crosshair” typesetting method should be used, and the crosshairs of the printing plate and the ink pattern should be aligned, and if necessary, the magnifying glass can be used to check the deviation.
3. Printing ghosting and whiteout problems
Analysis of the causes: These two problems are common in the production process. The ghosting around the printed pattern or text is caused by the excessive pressure of the anilox roller and the printing plate; the ghosting of the front edge of the printing is caused by the excessive pressure between the printing cylinder and the platen roller. Large-area printing through the bottom, whitening is caused by insufficient pressure of the printing roller and the embossing roller. These two problems are caused by the opposite pressure.
Solution: The printing ghost problem should adjust the gap and pressure between the anilox roller and the plate roller, commonly known as the upper pressure. The ghosting is because the upper pressure is too large, and the anilox roll squeezing the printing plate (referring to the flexographic plate) is deformed, so the gap between the two rolls is increased to reduce the pressure accordingly. The problem of printing leakage should adjust the gap and pressure between the plate roller and the platen roller, commonly known as the downforce. Due to the excessive gap between the plate roller and the platen roller, it is not possible to print in a large area, which requires an increase in the downforce.