Characteristics and application of the hottest mag

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Characteristics and application of magnetic die-cutting technology

the magnetic roll and magnetic plate (die-cutting blade plate) are mainly made by using the principle of magnetic field. A single permanent magnet sheet is arranged according to polarity and embedded in the groove of the stainless steel roll matrix. Due to the excellent polarity distribution, the magnetic roll produces a strong magnetic field and permanent magnetic force, and the die-cutting blade is adsorbed on the roll surface by the suction of the magnetic field

generally, the base of magnetic roll protection ring (roll shoulder) and calibration ring is stainless steel. Its service life can be extended after carburizing and hardening. Since the magnetic roll is used as the master roll, the machining accuracy is required to be relatively high, and the concentricity error is usually required to be no more than ± 2 μ m。 The distance between the roll shoulder and the roll surface is a very important parameter, which should be determined according to the product conditions (mainly the thickness). 0.48mm is more commonly used in Europe

the die-cutting blade plate is made by chemical etching and mechanical engraving. Firstly, chemical corrosion method is adopted. After computer typesetting, the concave part of the die-cutting blade plate is corroded to a certain depth, on this basis, the die-cutting blade plate is machined by CNC machining center, and then the post process treatment, such as nickel plating, is carried out according to the requirements of Xiaozhou. Chromium plating, carburization and laser treatment

there are three basic parameters of die cutting J blade: die cutting angle a, blade height h and base 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, so that people can intuitively see those very appetizing foods, the die-cutting blade should choose a larger die-cutting angle; If the processed die-cutting blade is used to cut film materials and composite materials, a small die-cutting angle should be selected, and the selection range of blade height h is 0.30mm ~ 1.50mm. The specific blade height should be determined according to the thickness of die-cutting materials. In Europe, the blade height of 0.44mm is more commonly used. The thickness s of the base plate is determined by the knife height h, when the knife height is 0.44mm. The thickness of the bottom plate s is generally controlled by PC microcomputer between 0.12mm and 0.14mm

the root of the die-cutting blade (5) start the experimental procedure. According to the processing technology, it can be divided into general-purpose type, enhanced type (hardening treatment) and laser (Manufacturing) type. The knife line hardness of the die-cutting blade made by laser can reach the maximum Rockwell hardness of 67 ~ low-end production capacity of 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 through or full cut through), 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 200000 ~ 500000 revolutions under the condition of half penetration. The service life of the reinforced die-cutting blade is 40% - 50% longer than that of the general-purpose die-cutting blade, and the service life of the laser (Manufacturing) die-cutting blade is 80% - 100% longer than that of the general-purpose die-cutting blade

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