Solving the pain points in Packaging Production - Selection and Usage Skills of creasing Strips and knife plate spring Pads
In the packaging production workshop, such problems are often encountered: blurred creases on cartons make folding difficult, paper adhesion after die-cutting affects production efficiency, and frequent damage to the cutting edge increases production costs... These seemingly intractable pain points are often related to improper selection or non-standard use of indentation strips and knife plate spring pads. Mastering the selection and usage skills of these two types of accessories is the key to solving production problems and improving product quality.
The key to selecting an creasing matrix lies in "matching" - precisely matching the characteristics of the paper and the requirements for indentation. First, the height of the creasing strip should be selected based on the thickness of the paper. Generally speaking, for every 0.1mm increase in paper thickness, the height of the creasing strip should increase by 0.08 to 0.1mm accordingly to ensure an appropriate creasing depth. Secondly, the selection of hardness is crucial. For thick and structurally complex materials such as corrugated cardboard, indentation strips with higher hardness (Shore hardness 70-80 degrees) should be chosen to prevent indentation deformation. For thinner materials such as coated paper and specialty paper, indentation strips with lower hardness (Shore hardness 40-60 degrees) should be selected to prevent the problem of burst lines. In addition, the cross-sectional shape of the indentation strip should also be selected based on the groove type of the knife plate. U-shaped grooves are suitable for arc-shaped cross-section indentation strips, while V-shaped grooves are suitable for wedge-shaped cross-section indentation strips to ensure a tight fit.
The selection of the knife plate spring pad focuses on "compatibility" - efficient compatibility with the die-cutting process and the type of knife plate. In terms of density, for low-speed die-cutting (less than 300 times per minute), a elastic pad with a density of 0.3-0.5g/cm³ can be selected, while for high-speed die-cutting (more than 500 times per minute), a high-elastic elastic pad with a density of 0.6-0.8g/cm³ should be chosen to cope with high-frequency impacts. From the perspective of installation position, narrow spring pads should be selected on both sides of the die-cutting knife to avoid interference with the cutting edge. In large blank areas, wide spring pads can be used to enhance the buffering effect. Meanwhile, the hardness of the knife plate spring pad also needs to match the pressure. When the pressure is high, a high-hardness spring pad should be selected to prevent excessive deformation. When the pressure is low, a low-hardness spring pad should be chosen to ensure rapid reset.
Maintenance and upkeep are equally important during use. Before using the creasing matrix, surface impurities should be cleaned to avoid defects in the indentation. If surface wear or deformation is found during use, it should be replaced in time to prevent affecting the quality of the indentation. The elastic recovery ability of the knife plate spring pad needs to be checked regularly. If there are problems such as permanent deformation or cracking, it should be replaced immediately to avoid damage to the blade due to the failure of the buffer. In addition, when changing the knife plate, the condition of the indentation strip and the spring pad should be checked simultaneously to ensure that the entire set of accessories is in the best working condition.