Carton die-cutting indentation technology

In the die-cut part of the drum, it is important to note the different design drawings (ie, the height of the radial indentation through the die-cutting machine). The radial indentation height not only generates the necessary pressure on the indentation, but more importantly it is a very important parameter that helps the paperboard to pass through the die-cutting unit during the high-speed operation of the printing press.

If the height of the indentation is too low, the actual circumference of the die cut will be smaller than the design pattern, and the die cut product will be shorter than the original design.

In fact, radial indentations carry out a real inspection control of the board and its progress during the machine. Make it clear where it is in the die cut, because when the radial indentation is too low, it is very easy to find the difference in the measurement between the bite and the tip. In this case, the tip is typically 3 mm to 4 mm short, which is mainly due to the bite during die cutting, the auxiliary roller set (the rotational speed of the printing press), and the pulling speed of the same carton board through the die cutting assembly. Cardboard will not stay in the auxiliary guide unit. It can smoothly reach the die-cutting unit. At the same time, the back of the carton begins to die-cut, but the unfolded perimeter of the carton board is shorter than required, resulting in a better box (box) than required. Smaller (Figure 2)
The recommended height of the indentation for a 66-inch machine is 22.6 mm (whether in the radial direction or in the axial direction), because in this case, in the guide shaft assembly, a flat speed is maintained, the theoretical dimensions of the box No change will occur.

Many carton plant practices have shown that using these parameters (standards), most of the problems in processing are gone.

Of course, we can't guarantee that this method will solve all the problems, because the change in the box size will cause other factors to change. For example, if some of the parameters (standards) are not “correct”, then those correct parameters are also used. May be invalid. In order to solve this problem, these parameters must be specifically listed and excluded, and the best method must be used to work.

The heights, indentation heights, and dimensional stability (such as B-tiles and BC corrugations) of single and double corrugated die cutters are constrained by a number of factors including: (1) the thickness of the carton board (including face paper); (2) for the purpose of stripping , The penetrating force necessary for die-cutting; 3 The height and shape of die-cut teeth; 4 The ratio between the area of ​​the box and the number of sides; 5 The condition of the carton board (wet or dry); 6 Moisture-proof treatment; 7 Used Die cutter and indentation height.

In the manufacture of dieboards, according to experience, different heights should be defined between the die cutters and the indentations so that the overall effect of the two component profiles (knives and indentations) is equal to the height of the profile (22.8 mm).

E.g:
1. Knife height - indentation height = 2.8mm> indentation height = 22.6mm
2. Knife height - indentation height = 4.5 mm> indentation height = 21.6 mm
It is recommended that the drilling height be less than the height of the die cutter 1.5mm.

Pasting a series of sponge rubber tapes in the radial direction can solve some practical problems. The following data are recommended:
The height after compression in the rubber band (closed hole) is 19mm x 22mm.

In order to put rubber sponges, many carton manufacturers and dieboard manufacturers do not want to use "high" indentation heights, mainly to avoid any breaks in the interior of the liner during die cutting and the finished box ( The box) does not meet the design requirements.

Some carton makers use a speed adjustment of the machine's transmission or machine's compensation mechanism to modify the speed of the die press roller so that die plate roller braking and die plate roller rotation speed can be adjusted to make the box die cut accurate.
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