Die cutting indentation process common technical problems (2)

As people's requirements for the outer packaging of goods are getting higher and higher, the level of die-cutting and indentation technology will inevitably increase. As an important process in the finishing and finishing of post-print packaging, the die-cutting and indentation process is a necessary processing method to affect the aesthetic level of the commodity packaging box. Here are some of the common problems for die-cutting and indentation processing, and talk about their solutions.

1、Inaccurate die-cutting or inaccurate position of die-cutting indentation

1. The position of the die-cut indentation line does not match the position of the printed product. The reasons for this failure are as follows:

(1) There is an error in the production process of the die cutter. The ideal die-cut indentation location cannot be absolutely achieved. Die cutting knife production methods are mainly manual plate making and laser plate making. The precision of laser plate making is relatively high. The design and cutting are done by computers and machinery. It is suitable for making middle and high-grade packaging die-cutting; the manual plate-making method has high technical level requirements for plate-making, and the plate-making technology is based on the technical level and experience of the plate-making person. The influence of factors is suitable for short and medium version packaging with low precision requirements. Therefore, in order to obtain good die-cutting accuracy, advanced plate-making methods must be selected.

(2) The paperboard mouthwash is of different rules. Die cutting machine itself will produce precision error, there is no error die cutting machine does not exist, to improve die cutting indentation accuracy, we must choose a high precision die cutting machine. Such as check the cardboard mouth rinse specifications error. It may be that the rear positioning of the die-cutting machine (also referred to as secondary positioning) is too small, which can be solved by adjusting the positioning and increasing the distance after the positioning.

(3) The position of die-cutting indentation and printing is not aligned. The solution is to re-calibrate the die-cut version based on product requirements, and correct the printing and die-cut indentation locations. In addition, it can also be corrected by adjusting the paper conveying side positioning rules or the front positioning rules, so that the die-cutting indentation line and the printing grid register.

(4) In addition, the difference between the die cutting indentation and the printed work environment will cause the cardboard fibers to be deformed or stretched, as well as inaccurate die-cutting indentation positions. The solution is to ensure that the die-cut indentations are printed in the same working environment or that the work environment is identical (ie, has the same temperature, humidity, etc.).

2, indentation line is not clear there is "dark or fried line"

“Dark line” refers to an indentation line that should not be present; “Fry line” refers to a breakage or partial breakage of the cardboard fibers due to the excessive pressure of the die-cut indentation that exceeds the tolerance of the cardboard fiber. The causes of the failure are as follows:

(1) The indentation line and the indentation mold are not selected properly. The type of indentation mold and the height of the indentation line can be selected as follows. When the board is cut after die cutting:

Indentation die groove = paper thickness

Groove width of indentation mold = 1.5 times the thickness of paper thickness ten indentation line thickness

Indentation line height = Die cutter height (paper thickness ± 0.05m m)

When die-cutting corrugated cardboard:

Groove depth of indentation mold = corrugated paper pressure in real time

Groove width of indentation pattern = 2 times the thickness of corrugated paper Ten thickness of indentation line

Indentation line height = die cutter height - corrugated paper pressure in real time

(2) Improper pressure adjustment of the press, too large or too small.

The solution is the pressure regulating mechanism of the die-cutting machine, and the pressure of the die-cutting machine is appropriately adjusted.

(3) The adhesive pad thickness of the fixed pad is inaccurate. The pad is too low or too high. The adjustment method is to refill the paper.

(4) The poor paper quality or low moisture content of the paper will increase the brittleness of the paper, and the toughness will reduce the explosion line, which can be solved by increasing the ambient temperature.