Among the key points of die cutting and indentatio

Key points of corrugated box die cutting and indentation process (middle)

thickness control of indentation steel wire

it is very important to control the actual thickness of indentation steel wire. If the indentation steel wire with large thickness tolerance is selected, it will fall to one side when pressed on the die cutting plate, resulting in a series of problems: the indentation position deviates from the design position; Carton shape changes; The box pasting machine is jammed; The adhesive strip on the bottom template is glued and displaced; The indentation height decreases and the indentation is too shallow; The indentation steel wire is loose or even falls off

height control of indentation steel wire

the height of indentation steel wire is calculated according to the height of the blade and the thickness of the die-cutting material. For paper with good tensile property, a higher indentation steel wire can be used, and when the paper is brittle, the height of indentation steel wire needs to be reduced. In actual production, although the height of the indentation steel wire installed on the die-cutting plate has been strictly calculated and corrected, the indentation is always not in place, often a batch of shallow, a batch of deep, which must be constantly adjusted during die-cutting

the circular die-cutting has a large expansion space in which plastic packaging materials account for more than 30% of the total amount of various packaging materials at present, and the height of indentation steel wire is easier to choose. Generally, the horizontal indentation steel wire is slightly higher than the circumferential indentation steel wire

design of indentation groove

the inner side of the indentation groove is cut into an oblique angle, which will not crush the corrugated board. For some corrugated box packaging with anti leakage requirements, it can also effectively solve the bursting phenomenon caused by the indentation of corrugated board

quality requirements for indentations

all indentations should be neat, flat, bent, and not cracked

bending is closely related to the depth of the indentation. Pressing too shallow will not bend, and pressing too deep will cause fracture. The correct depth depends on the hardness of the cardboard. The impression of the male mold must be in the middle of the impression of the female mold

the flap indentation should be easy to bend, and the tissue paper should not be broken. The error between male mold indentation and female mold indentation shall not exceed ± 1mm

the indentation on the box surface should be bent smoothly and basically vertical, unless some cracking is allowed on the inner side paper

adjustment of layout pressure

the appropriate pressure makes the cut edge of the finished product clean and hairless, easy to remove the waste edge, and the die-cutting knife is not easy to wear. First roughly adjust the pressure of the machine, pad paper under the steel plate, and then observe whether the waste edge at the cutting edge is easy to separate after the pressure test. Pad paper locally at the place where it is not separated, so that the pressure of each die-cutting knife of the layout is uniform, and then gradually increase the pressure of the machine after balancing. The pressure of the indentation line depends on the thickness and height of the indentation line, and the ideal pressure needs to be tested by pressing out the sample

advantages of front die-cutting

front die-cutting is more conducive to solving the problem of line bursting than back die-cutting. Because corrugated board needs to be dried at high temperature when mounting paper, the face paper of corrugated board is usually relatively simple. If there are more recycled ingredients in this layer of face paper, it is easier to cause line bursting during die-cutting when printing a large area of field. Therefore, many cardboard manufacturers have to use more expensive raw paper to process face paper, but this increases the production cost

when encountering die-cutting line bursting, most carton factories are used to using the back die-cutting method, but in fact, in this case, nearly all Leeb hardness meters are single 1-angle ones on the market. Using the front die-cutting can greatly reduce the occurrence of line bursting, especially at the indentation where 180 degree folding is required. If the back die-cutting is used, line bursting will certainly occur

this is because during die-cutting indentation, the compression between the layers of the paperboard is not polymerization, but dispersion; The more dispersed the layers in the paperboard, the smaller the tension in the paper, such as the data board, which is more conducive to creases. If the back die-cutting method is adopted, when the indentation is folded more than 90 ', the layers of the paperboard that have been crushed are pressed together again, and there will be a burst line. On the contrary, if the front die cutting is adopted, the paperboard can be kept in a dispersed state, which can effectively solve the problem of thread bursting when the folding exceeds G0 *. Therefore, when encountering the problem of die-cutting bursting line, in addition to improving the quality of paperboard, using front die-cutting is also an effective method to solve the problem of die-cutting bursting line, which is more cost-effective. In addition, the use of front die cutting can improve the alignment of die cutting, which can effectively improve the precision of die cutting

(to be continued)