The paper's expansion and contraction changes are not allowed in 10 million pages. If the stability of the paper is poor, the moisture content in the printing process will change significantly. After multiple processing processes, due to heat or moisture absorption, the cardboard will expand and contract. In such a case, when the die-cutting indentation is performed, the layout position of the printed product will be deviated. In actual production, try to avoid using the newly produced paper. The newly produced paper should be stored for a period of time to ensure that it can be relatively balanced with the printing conditions before it is put into use, so that its deformation coefficient is relatively small. For products with high precision requirements, the deformation coefficient in each process should be fully considered, and the layout position should be adjusted as appropriate when printing the imposition. In addition, it is necessary to control the temperature and humidity of the base paper warehouse, production workshop and various production processes, and there is no obvious difference between high and low to ensure the accuracy of the location and specifications of the die-cutting indentation.
The change in the thickness of the cardboard will affect the position of the finished layout after die-cutting and indentation, especially after mounting corrugated cardboard, due to its increased thickness, after the die-cutting and indentation is formed, the layout position of the product will also have deflection errors. When printing the imposition, the position of the layout should be considered after the product is folded and thickened.
The obvious warpage of the cardboard will cause inaccurate positioning. When the corrugated cardboard that is warped after printing and other processes enters the die-cutting machine for die cutting, the surface of the cardboard does not evenly contact the die-cut plate, so that the warped cardboard surface first contacts the rubber strip or sponge on the plate surface, which is easy The paperboard will slip, resulting in inaccurate die cutting. Maintaining good flatness of cardboard is an important part of improving the precision of cardboard die cutting. The key to controlling the flatness of corrugated cardboard is to control the production process of the single-sided machine of the corrugated cardboard production line; to select the supporting production of paper with similar moisture content of corrugated paper and cardboard; to control the speed and temperature of the single-sided machine, Prevent the obvious warpage of corrugated cardboard and affect the die cutting accuracy of the product.
The mounting of facial paper and backing paper is not allowed to cause the positioning error of die cutting. If the two layers of paperboard on the printing surface and the non-printing surface are not mounted correctly, the paper on the non-printing surface will protrude from the regular paper edge of the printing surface, which will inevitably cause the positioning error of the die-cutting of the cardboard. In the process of mounting and mounting, it is inevitable that mounting inaccuracies will occur. In order to prevent the irregularity of the paper edge of the non-printed surface after mounting and mounting, according to the characteristics of the product, the side and front rules of the semi-finished product shall be printed according to the characteristics of the product. Add trim margins ranging from 3mm to 6mm on the edge of the paper. Properly shrink the regular paper edge of the non-printed surface by several millimeters to occupy the space, which can effectively prevent the irregular paper edge of the non-printed surface from appearing convex and ensure accurate die cutting of the product.
Poor machine causes inaccurate die-cut positioning. If some parts of the die cutting machine are worn or loose, it is also easy to cause the positioning of the die cutting of the cardboard to be inaccurate. The machine should be carefully observed and inspected before production, and corresponding measures should be taken to deal with the existing bad conditions to ensure that the die cutting of the product is accurate.
Die cut and indented plate is loose and deformed, resulting in inaccurate plate position and specifications. Because the pressure of die-cutting indentation is relatively large, if the size of the plate is too large, the plate frame is not used to install the plate, and the installation of the plate is not very strong, which will cause the die-cut plate to move along the lateral position of the plate table. Under the influence of huge pressure, the die-cutting plate may make the core of the plate solid, and the steel blade is also prone to bending and other undesirable conditions. It will also change the specifications of the die-cutting plate and affect 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, timely measures should be taken to correct them.
Excessively thick rubber strips or sponges cause inaccurate die cutting. The role of rubber strips and sponges is to use elasticity to quickly separate and peel off the die-cut semi-finished products and scraps from the die-cutting plate to achieve a continuous and normal die-cutting process. Generally speaking, the rubber strip should be 3mm ~ 5mm higher than the blade edge, and the sponge block is higher than the blade edge. It should be mastered reasonably according to the characteristics of the product to achieve better results. During production, it must be noted that the flatness of the cardboard is not good, and the rubber strip or sponge is too thick. When the pressure is applied, the rubber strip and sponge will first touch the warped paper surface, causing the printing sheet to shift and cause inaccurate die cutting.
Misalignment of the paper grain direction causes the position of the die-cutting indentation to be inaccurate. There is one direction on the vertical and horizontal layouts, which is usually composed of multiple small plates. If you use the horizontal lines of paper that are most prone to shrinkage and change to print the layout in multiple imposition directions, it is easy to cause inaccurate die cutting. When the vertical or horizontal layout of the layout is a combination of multiple editions, the longitudinal threads of the paper should be used for printing to ensure the accuracy of die cutting.
The error of the manufacturing process of the die-cutting knife version makes it impossible to achieve the ideal die-cutting indentation position. At present, there are mainly two methods for making die-cutting knife plates: manual plate making and laser plate making. The precision of laser plate making is relatively high, and the design and cutting are done by computer and machinery. It is suitable for the die-cutting of high-end packaging; the manual plate making method requires high technical level of the plate maker, and the precision of plate making is subject to the technical level and experience of the plate maker. Influenced by factors, it is suitable for short and medium-sized packaging with low accuracy requirements. To get good die-cutting accuracy, you must choose an advanced plate-making method.
The die cutting position is not accurate due to the irregularities of the cardboard gripper. The die-cutting machine itself will produce precision errors. There is no error-free die-cutting machine. To improve the accuracy of die-cutting indentation, we must choose a high-precision die-cutting machine. If the specification error of the cardboard mouth is large. It may be that the dialing machine's rear positioning (also called secondary positioning) dialing distance is too small, which can be solved by adjusting the rear positioning and increasing the rear positioning dialing distance.
The position of the die-cutting indentation and the printed grid is not correct. According to the requirements of the product, the die-cutting plate can be re-calibrated, and the printing and die-cutting indentation positions can be adjusted; it can also be adjusted by adjusting the positioning rule or front positioning rule of the paper conveying side, so that the die-cutting indentation line and the printing position set quasi.
Die cutting indentation and printing work environment different will cause cardboard fiber deformation or stretching, will cause die cutting indentation inaccurate position, try to ensure that die cutting indentation and printing in the same working environment or to ensure the same working environment Sex (ie, having the same temperature, humidity, etc.).
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