What are the relevant factors of stereo hot stamping
The three-dimensional hot stamping process requires two templates of concave and convex, and a hot stamping machine with high precision must be selected, otherwise it will cause damage to the punch. In addition, attention should be paid to the adjustment of temperature and pressure of two key parameters in the process of stereo hot stamping. Temperature regulation should be regarded as the key point of three-dimensional hot stamping quality control, strictly control the preheating time, and ensure that the temperature rise and fall are synchronized with the hot stamping speed. The amount of hot melt adhesive applied to anodized aluminum itself is very small, so if the hot stamping heat received by it is slightly deviated, it will directly affect the transfer quality of anodized aluminum. In addition, the metal aluminum layer coated on the anodized aluminum surface is also very thin (only 1-2 μm thick) and very sensitive to temperature changes, so it is important to carefully control the hot stamping temperature. However, the temperature regulation is not easy to control, so in the actual production process, there are often some quality problems due to fluctuations in the hot stamping temperature. For example, when the hot stamping temperature is too low, the anodized aluminum hot melt adhesive is not fully melted, and it is easy to have quality defects such as hot stamping defects, pasting, hot stamping, and flowering; When the hot stamping temperature is too high, the surface aluminum layer of anodized aluminum will melt again, and there will be spatter, and quality defects such as discoloration, surface fogging, and no laser luster will occur. In addition, bubbles, aluminum, peeling and delamination and other faults have a great relationship with the control of hot stamping temperature, and the producer should adjust the hot stamping temperature according to the specific performance of quality failures. Pressure control In order to make the three-dimensional hot stamping products comparable to the concave and convex effect of simple embossing products, it is necessary to control the quality of embossing and convex while ensuring the hot stamping effect. Since three-dimensional hot stamping is a process that completes hot stamping and embossing at the same time, the pressure not only affects the adhesion of anodized aluminum, but also relates to the embossing effect, and sometimes there may be an irreconcilable contradiction between the two. For example, setting the pressure higher can increase the adhesion of anodized aluminum on the paper, which is beneficial to hot stamping, but the paper may be damaged during the embossing process. Therefore, in order to achieve the best hot stamping effect on the basis of not crushing the paper, it is necessary to carefully set the pressure, reasonably adjust the height of the hot stamping plate, accurately calibrate the concave and convex bottom die, and ensure that all the hot stamping plate and the bottom die height and flatness are consistent. In addition, it is necessary to check and track the quality of the bottom die, especially after the bottom die has continuously borne tens of thousands, hundreds of thousands of times of compressive impact force, special attention should be paid to check the deformation and toughness of the bottom die, and replace the worn bed die in time.