Features and applications 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 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 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 choose a larger die Cutting angle; if the processed die-cutting blade is used for die-cutting film materials and composite materials, a smaller die-cutting angle a should be selected. The selection range of knife height h is between 0.30mm ~ 1.50mm, the specific knife height According to the thickness of the die-cut 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 0.12mm and 0.14mm.

Die cutting blades can be divided into general-purpose, reinforced (hardened) and laser (manufacturing) types according to the processing technology. The hardness of die cutting blades made by laser can reach a maximum of 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 semi-cutting state. 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% to 100% longer than that of the general-purpose die-cutting blade.

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