With the development of science and technology and the continuous improvement of people's living standards, more and more commodities and raw materials use different packaging forms and processing techniques, and die-cutting technology has also attracted more and more attention. Circular die cutting tools can be basically divided into two categories according to the processing method: integral die cutting roller (the knife line is directly processed on the base roller) and split die cutting roller (magnetic roller + die cutting knife plate). Here we mainly discuss the magnetic die cutting technology.
Main points of magnetic die cutting technology
The magnetic roller and the magnetic plate (die-cutting knife plate) are mainly made by the principle of magnetic field, and the single permanent magnet pieces are arranged according to the polarity and embedded in the groove of the stainless steel roller base. Due to the excellent polarity distribution, the magnetic roller is very strong. The magnetic field and permanent magnetic force use the magnetic field suction to attract the die cutting plate to the surface of the roller body.
Usually the base body of the magnetic roller protection ring (roller shoulder) and the calibration ring is stainless steel. Carburizing and hardening treatment can prolong its service life. Since the magnetic roller is used as a mother roller, its processing accuracy is relatively high, and the concentricity error usually does not exceed ± 2 μm. The distance from the shoulder of the roller to the surface of the roller body is a very important parameter. It should be determined according to the product (mainly the thickness). The most commonly used in Europe is 0.48mm.
Die cutting blades are made by chemical etching and mechanical engraving. First, the chemical etching method is used. The recessed parts of the die-cutting knife plate after computer typesetting are corroded to a certain depth, on this basis, the die-cutting knife plate is mechanically processed by a CNC machining center, and then post-process treatment such as nickel plating is performed according to the requirements of Xiaozhou. Chrome plating, carburizing and laser treatment etc.
There are three basic parameters of die-cutting J knife plate: die-cutting angle a, knife height h and bottom plate thickness s. The selection range of die cutting angle a is 30 ° -120 °, which usually depends on the type of material to be die-cut. Generally speaking, if the material to be die-cut is paper, the die-cutting blade should select a larger die Cutting angle; if the processed die cutting blade is used for die cutting of film materials and composite materials, a smaller die cutting angle should be selected. The selection range of knife height h is between 0.30 and 1.50 mm, and the specific knife height should be According to the thickness of the die-cutting material, the 0.44mm knife height in Europe is used more. The thickness s of the bottom plate is determined by the blade height h, in the case where the blade height is 0.44 mm. The thickness s of the bottom plate is generally between 0.12-0.14mm.
According to the processing technology, the die cutting blade can be divided into general type, reinforced (hardened) and laser (manufacturing) types. The hardness of the die cutting blade made by laser can reach the maximum Rockwell hardness 67-68 (HRC67- 68).
There are many factors that affect the service life of die-cutting tools, such as die-cutting pressure, material type, texture, die-cutting requirements (half-cut or full-cut), ink, machine debugging status, and operators. So it is difficult to give an exact value. The service life of the general-purpose die-cutting blade is generally 200,000 to 500,000 revolutions in the half-cut condition. The service life of the reinforced die-cutting blade is 40% -50% longer than that of the general-purpose die-cutting blade. ) The service life of the die cutting blade is 80% -100% longer than that of the general die cutting blade.
According to the working principle, die cutting tools can be divided into two types: pressure cutting mode and cutting mode. When using die-cutting die cutting, the blade directly contacts the smooth bottom roller or bottom plate after cutting through the processed material, while the shear die cutting tool uses two blades to cut the material to be processed. Most of the magnetic die cutting adopts the pressure cutting method, the process is simple, the production cost is relatively low, and the production cycle is also short.
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