The main cause of static electricity is friction. When two solid materials come into contact and leave quickly, one of them has a stronger ability to absorb electrons, thus transferring electrons to the surface of the material. The obtained electron surface is negatively charged, while the other one is positively charged due to the loss of the electron surface.
The main factors causing static electricity are:
1. Material properties include internal chemical composition, internal structure, mechanical properties of stress and strain, shape and conductivity of materials.
The conductivity of materials has dual effects on static electricity. First, if the material is a conductor, the charge can move freely on its surface, and the charge is evenly distributed on its surface, rather than staying where the charge is generated. The distribution of this charge on the surface only causes low pressure. In contact with any part of the conductive material, the charge is immediately transferred to the ground. Insulating materials are different from conductors, such as most base materials such as paper and plastic film. The static electricity generated will form a higher voltage, which can not be eliminated by grounding.
2. Environmental conditions include the composition, pressure, temperature and humidity of the gases around the contacts (materials).
3. Mechanical effects include contact type, contact time, contact area, separation speed and mechanical properties of materials. Generally speaking, the closer the two materials contact or separate, the greater the electrostatic charge.
4. Friction between different materials will produce different polarities of static electricity. Different materials have different electrostatic strengths
High quality stamping quality assurance, the common stamping production version is relatively simple, mainly using electronic engraving plate-making process and photo etching plate-making process, packaging manufacturers now use stamping process is more complex, belongs to the category of three-dimensional stamping.
Temperature, pressure and speed are the three elements of three-dimensional stamping technology. Only by controlling the relationship among them can the quality of stamping be controlled. The hot stamping speed is fast, the heating time is short, and the hot stamping temperature drops quickly, which leads to low temperature, which will affect the hot stamping fastness. The hot stamping speed is slow, the heating time is long, the hot stamping temperature drops slowly, and the hot stamping fastness is good, but if not well controlled, the hot stamping temperature will be too high. Therefore, the proper stamping speed is to obtain high quality stamping effect. In addition to the requirement of electrochemical aluminium foil transferring to the surface of printed matter, and the huge pressure, but also stamping pressure embossing mode part, so the pressure is greater than ordinary stamping, which requires better stamping foil strength to withstand strong pressure.
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