[China Packaging Network News] You want to make a qualified paper box, the cutting process is of utmost importance. In addition to the excellent performance of the die-cutting equipment, the quality of the paper-cutting die must pay special attention to the following details.
A die cutter
Die cutter can be divided into four types according to the form: low front knife, single low front knife, peak knife, single-side peak knife. These four types of die cutters are suitable for different types of materials. The small front knife is mainly used for processing ordinary paper jam. The single-sided low front knife is mainly used for processing fiber materials, and the high front knife is mainly used for processing corrugated cardboard, leather and plastics. The single-sided high front knife is mainly used for processing EVA and sponges.
Improper selection of die cutter will not only result in poor die cutting of the paper a box, such as burrs and dust on the die cutting edge, but also make it necessary to replace the die cutting knife repeatedly in the process to reduce the production efficiency. In general, the die cutter used for carton die cutting has a height of 23.8 mm and a thickness of 0.71 mm. If die-cutting special jobs, you need to select die cutter types in a targeted manner.
Currently, the brands of carton die cutters widely used in the industry include Sweden's SANDVIK, Austria's BOHLER, Japan's TSUKATANI, and Taiwan's SANLI. For the high quality requirements, large production batches, and the need for repeated printing of live jobs, it is recommended to use imported die cutters with excellent performance. For jobs with low quality requirements, small production batches, and mainly used for proofing, lower costs can be used. Homemade die cutter.
2. Sponge tape
According to different hardness, sponge rubber strips are generally divided into low, medium and high grades. Each grade sponge strip has different applications. For example, sponge strip with a hardness of 30-45 Shore hardness is suitable for quantification at 300g/m2. The following lightweight papers, sponges with a hardness of 45-60 Shore A are suitable for corrugated board and white cardboard with a basis weight higher than 300 g/m2, and sponges with a hardness of 60-75 Shore hardness are mainly used for easy use. Fluffing die cutting edge.
In the installation of sponge strips also need to pay attention to some details, such as sponge rubber strips should not close to the die cutter blade, this is because in the die-cutting process sponge strip will be compressed, when the curved surface to the die-cutting blade, This will create an outward pull on the die cutter, causing the die-cut edge of the paper to be serrated. Therefore, a gap of 2 to 3 mm is required between the sponge strip and the die cutter blade.
Three. Indentation mold
A suitable indentation mold is also very important. When selecting the indentation mold, the dimensional accuracy, the hardness of the base paper and the fastness of the paste should be mainly concerned, and the CITO indentation mold is more widely used in the current market. In addition, the dimensions of the selected indentation mold are different for different thicknesses of paper.
Four. Paper
Many people think that it is not difficult to obtain good processing results for paper through die cutting, but often ignore the internal details of the paper. Each kind of paper has different fiber structure, deformation resistance and surface coating quality. Therefore, when we choose the carton paper, first of all, we must ensure that it has good folding endurance. Under the circumstances, it is also not easy to cause a burst phenomenon, and when it is bent, its surface coating will not produce serious cracks; secondly, the thickness within a unit area of ​​the same paper must be consistent, and the thickness error between the papers should be maintained Within ±5μm, otherwise it is very easy to cause problems such as die-cutting, inefficient production, especially for some reprocessed paper; in addition, the degree of deformation of the paper has a direct impact on the quality of the paper-cutting die, once Deformation of the paper will result in inaccurate die-cutting positions, resulting in a lot of waste products.
Conditional packaging and printing companies can use paper inspection to sort these details into the scope of quality control of cartons.
Five. Fine operation
Before die-cutting a batch of new jobs, operators need to clean the floor of the die-cutting machine first, because the surface of the floor may have residual adhesives and other impurities in the process. In addition, when the operator adjusts the die-cutting pressure, it needs to be gradually performed from small to large. If the die-cutting pressure is increased at one time, the die-cutting knife and the bottom plate will be damaged, and the die-cutting machine will be damaged when serious.
For the same batch of jobs, different operators will have different cutting results. Therefore, in the daily production, the operators need to follow the standardized operating rules. At the same time, all departments must maintain good communication and exchange experiences with each other.