Characteristics and application of magnetic die cutting technology
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The magnetic roller and magnetic plate (die-cutting plate) are mainly made by the principle of magnetic field. The single permanent magnet pieces are arranged in polarity and embedded in the groove of the stainless steel roll base. The magnetic roller is very strong due to the excellent polarity distribution. The magnetic field and the permanent magnet force use the magnetic field suction to adsorb the die cutter plate on the surface of the roller body.
Usually the base of the magnetic roller guard ring (roller shoulder) and the calibration ring is stainless steel. It can extend its service life after carburizing and hardening. Since the magnetic roller is used as a mother roller, its processing accuracy is relatively high, and the concentricity error is usually required to be no more than ±2 μm. The distance from the shoulder to the surface of the roller is an important parameter. It should be determined according to the product condition (mainly thickness). The more used in Europe is 0.48mm.
The die cutter plate is made by chemical etching and mechanical engraving. First, chemical etching is used. The concave portion of the die-cutting stencil that has been typeset by computer is etched to a certain depth. On the basis of this, the die-cutting knives are machined by the CNC machining center, and then post-processed according to the requirements of the state, such as nickel plating. Chrome plating, carburizing and laser processing.
There are three basic parameters of die-cutting J-knife: die-cutting angle a, knife height h, and floor thickness s. The die-cutting angle a can be selected from 30° to 120°, which is usually determined according to the type of material to be die-cut. Generally, if the die-cut material is paper, the die-cutting plate should be larger. Cutting angle; if the die-cutting die is used to die-cut film materials and composite materials, the smaller die-cutting angle should be selected. The blade height h is selected from 0.30mm to 1.50mm. According to the thickness of the die-cut material, the knife height of 0.44mm in Europe is used more. The thickness s of the bottom plate is determined by the knife height h, with a knife height of 0.44 mm. The thickness s of the bottom plate is generally between 0.12 mm and 0.14 mm.
Die-cutting knives can be divided into general-purpose, reinforced (hardening) and laser (manufacturing) types according to the processing technology. The hardness of the dicing die made by laser can reach Rockwell hardness of 67-68 (HRC67~). 68).
There are many factors that affect the life of die-cutting tools, such as die-cutting pressure, material type, texture, die-cutting requirements (half-cut or full-cut), inks, machine commissioning conditions, and operators. So it is difficult to give an exact value. The service life of the general-purpose die-cutting knife plate is generally 200,000-500,000 rpm in the case of semi-cutting, and the service life of the reinforced die-cutting knives is 40% to 50% longer than that of the general-purpose die-cutting knives. The service life of the die-cutting die is 80% to 100% longer than that of the general die cutter.