Aspects of Paper Box Die-cutting Technology

Liyang paper products co.,ltd is a paper printing and packaging manufacturer on Dongguan city. accpet customized different kind of paper products and paper packaging, such as book printing, paper packaging box, paper gift box and paper shopping bag.

With the development of society and the improvement of people’s living standards, consumers, in addition to demanding the inherent quality of goods, have also put forward higher requirements for the packaging of goods, including the requirements for the design of packaging and decoration of goods. , also includes the requirements for the quality of packaging and post-press processing. Die-cut indentation is an important production process of post-press processing. It is suitable for the finishing of various types of printed materials. The quality of die-cutting directly affects the use effect and market image of the entire product. Correctly understand and understand some of the quality defects that die-cutting indentations are prone to appear in the production process, adopt appropriate technological measures, and perform scientific and reasonable die-cutting indentation production and quality control to effectively prevent various quality defects Occurrence and increase production efficiency are of great significance.

First, the location or specification of die-cut creasing is not accurate

Tensile change of paper size specifications are not allowed. If the stability of the paper is poor, the moisture content in the printing process will change significantly. After many processing processes, due to heat or moisture absorption, the paperboard will undergo a change in flexibility. In such a case, the position of the layout of the printed product will be deviated when die-cutting is performed. In actual production, try to avoid the use of freshly produced paper. Freshly produced paper should be stored for a period of time to ensure that it can be used after being relatively balanced with the printing conditions, so that its deformation coefficient is relatively small. For products with high requirements for accuracy, the deformation factor in each process should be fully considered, and the layout position should be adjusted as appropriate during the print imposition. In addition, it is also necessary to control the temperature and humidity of the raw paper warehouses, production workshops, and production processes, and it is not easy to have a clear disparity between the levels to ensure the accuracy of the positions and specifications of the die-cutting indentations.

Changes in the thickness of the board will affect the position of the finished board after die-cutting. In particular, after the corrugated board is inserted, due to the increase in thickness, the product will be biased after the die-cutting and creasing. When printing the imposition, consideration should be given to the position where the product should be placed after the product has been folded by increasing the thickness.

Obvious warping of the cardboard can result in inaccurate positioning. When the corrugated cardboard warped after printing and other processes enters a die cutting machine for die cutting, the surface of the cardboard is not in uniform contact with the die plate, so that the raised cardboard surface is first brought into contact with the rubber strip or sponge on the plate surface. Causes the board to slip, resulting in inaccurate die cutting. Maintaining good flatness of paperboard is an important part of improving the precision of paperboard cutting. To control the flatness of corrugated board, the key is to control the production process of a single-sided machine for corrugated board production line; to select the matching production of corrugated paper and liner board with similar moisture content; to control the speed and temperature of a single-sided machine, etc. Prevents the die-cutting accuracy of the product from affecting the marked warpage of the corrugated board.

The stencil of the paper and the paper cannot be allowed to cause die-cutting positioning errors. If two layers of cardboard with printing surface and non-printing surface are not accurately affixed, the non-printing surface of the paper will protrude beyond the edge of the printing surface, which will inevitably result in the positioning error of the cardboard. Inadvertently inadvertently inadvertently appears in the process of adhering, in order to prevent the non-printing surface of the adhering non-printing surface from appearing convex appearance, when printing, it is necessary to according to the characteristics of the product, the semi-finished product will be printed with the side gauge and the former Add 3mm-6mm edge trim margin. The non-printing side of the rules of the paper edge in the contraction of a certain number of appropriate to occupy the shed, can effectively prevent the non-printing surface of the rules appear convex paper edge, to ensure product die cutting accuracy.

Poor machine causes incorrect die positioning. If some parts of the die cutter are worn or loose, it is easy to cause the positioning of the cardboard die to be inaccurate. Before the production, the machine should be observed and inspected carefully, and corresponding measures should be taken to deal with the existing unfavorable conditions so as to ensure the accurate die-cutting of the product.

The looseness and deformation of the die-cutting indentation plate result in inaccurate layout position and specifications. Because the pressure of die-cutting indentation is relatively large, if the size of the layout is too large and the version of the plate is not used, the installation of the plate is not very firm, and the die-cut plate will be moved along the lateral position of the platen. Due to the huge pressure, the die-cut version may make the plate core solid, and the steel blade is also prone to bending and other unfavorable conditions. It will also make the die-cut version specifications change, affecting the die-cutting accuracy of the product. During the production process, attention should be paid to careful observation and inspection, and if problems are found, measures must be taken to correct them.

Excessive thickness of the rubber strip or sponge results in inaccurate die cutting. The role of the rubber strips and sponges is to use elasticity to quickly separate and shed the die-cut semi-finished products and scraps from the die-cut plate to achieve a continuous, normal die-cutting process. In general, the rubber strip is suitable for the knife edge of 3mm~5mm, and the sponge piece is more than the knife edge, and it should be reasonably grasped according to the characteristics of the product in order to achieve better results. During production, it must be noted that the flatness of the cardboard is not good, and the rubber strips or sponges are too thick. When the pressure is combined, the rubber strips and the sponges are likely to rub against the warped paper surface first, causing the displacement of the printed sheets to cause die-cutting inaccuracies.

Mistaking the direction of the paper pattern results in inaccurate die-cutting marks. One direction on the vertical and horizontal planes is generally composed of multiple small editions. If horizontally-stitched papers that are most prone to telescopic changes are used to print layouts in multiple imposition directions, it is likely to cause inaccurate die cutting. When the layout of the vertical or horizontal layout of the multi-version structure should be used to print the longitudinal silk paper, in order to better ensure the accuracy of die-cutting.

The error in the production process of the die cutter makes it impossible to achieve the ideal position of die-cutting indentation. Die cutting knife production methods are mainly manual plate making and laser plate making. The precision of laser plate making is relatively high, and 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 requirements on the technical level of the plate-making person, and the plate-making precision is affected by the technical level and experience of the plate-making person, etc. The influence of factors is suitable for short and medium version packaging with low precision requirements. To get good die-cutting accuracy, we must choose advanced plate-making methods.

The position of die-cutting due to different paperboard and cornices is not allowed. 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. If the paperboard mouth size error is large. It may be that the rear positioning of the die-cutting machine (also referred to as secondary positioning) is too small, and can be solved by adjusting the positioning and increasing the rear-positioning distance.

The misalignment of die-cut indentation and printed space is not allowed. According to the requirements of the product, the die-cut version can be re-adjusted to correct the position of the printing and die-cutting indentation; it can also be corrected by adjusting the paper conveying side positioning rules or the front positioning rules to make the die-cutting indentation line and the printing position set. quasi.

The difference between the die-cutting indentation and the printed work environment will cause the cardboard fibers to be deformed or stretched, resulting in the inaccurate position of the die-cutting indentation. It is necessary to ensure that the die-cutting indentation is printed in the same working environment or the same working environment is ensured. Sex (ie, the same temperature, humidity, etc.).
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